windows-xp/Source/XPSP1/NT/multimedia/opengl/server/soft/so_prim.c

/******************************Module*Header*******************************\
* Module Name: so_prim.c
*
* Routines to draw primitives
*
* Created: 10-16-1995
* Author: Hock San Lee [hockl]
*
* Copyright (c) 1995 Microsoft Corporation
\**************************************************************************/
/*
** Copyright 1991, Silicon Graphics, Inc.
** All Rights Reserved.
**
** This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.;
** the contents of this file may not be disclosed to third parties, copied or
** duplicated in any form, in whole or in part, without the prior written
** permission of Silicon Graphics, Inc.
**
** RESTRICTED RIGHTS LEGEND:
** Use, duplication or disclosure by the Government is subject to restrictions
** as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data
** and Computer Software clause at DFARS 252.227-7013, and/or in similar or
** successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished -
** rights reserved under the Copyright Laws of the United States.
**
** $Revision: 1.13 $
** $Date: 1993/08/31 16:23:41 $
*/
#include "precomp.h"
#pragma hdrstop

#include "glmath.h"
#include "devlock.h"

typedef void (FASTCALL *PFN_XFORM)
    (__GLcoord *, const __GLfloat *, const __GLmatrix *);

typedef void (FASTCALL *PFN_XFORMBATCH)
    (__GLcoord *, __GLcoord *, const __GLmatrix *);

#ifndef NEW_PARTIAL_PRIM
typedef void (FASTCALL *PFN_POLYARRAYDRAW)(__GLcontext *, POLYARRAY *);
#endif // NEW_PARTIAL_PRIM

typedef void (FASTCALL *PFN_POLYARRAYRENDER)(__GLcontext *, POLYARRAY *);

// The PA* functions apply to one array entry only.
// The PolyArray* functions apply to the whole array.

void FASTCALL PARenderPoint(__GLcontext *gc, __GLvertex *v);
void FASTCALL PARenderTriangle(__GLcontext *gc, __GLvertex *v0, __GLvertex *v1, __GLvertex *v2);
void PARenderQuadFast(__GLcontext *gc, __GLvertex *v0, __GLvertex *v1, __GLvertex *v2, __GLvertex *v3);
void PARenderQuadSlow(__GLcontext *gc, __GLvertex *v0, __GLvertex *v1, __GLvertex *v2, __GLvertex *v3);
void FASTCALL PAApplyMaterial(__GLcontext *gc, __GLmatChange *mat, GLint face);
void FASTCALL PASphereGen(POLYDATA *pd, __GLcoord *result);

GLuint FASTCALL PAClipCheckFrustum(__GLcontext *gc, POLYARRAY *pa,
                                   POLYDATA *pdLast);
GLuint FASTCALL PAClipCheckFrustumWOne(__GLcontext *gc, POLYARRAY *pa,
                                   POLYDATA *pdLast);
GLuint FASTCALL PAClipCheckFrustum2D(__GLcontext *gc, POLYARRAY *pa,
                                     POLYDATA *pdLast);
GLuint FASTCALL PAClipCheckAll(__GLcontext *gc, POLYARRAY *pa,
                               POLYDATA *pdLast);

void FASTCALL PolyArrayRenderPoints(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayRenderLines(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayRenderLStrip(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayRenderTriangles(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayRenderTStrip(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayRenderTFan(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayRenderQuads(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayRenderQStrip(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayRenderPolygon(__GLcontext *gc, POLYARRAY *pa);

#ifndef NEW_PARTIAL_PRIM
void FASTCALL PolyArrayDrawPoints(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayDrawLines(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayDrawLLoop(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayDrawLStrip(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayDrawTriangles(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayDrawTStrip(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayDrawTFan(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayDrawQuads(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayDrawQStrip(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayDrawPolygon(__GLcontext *gc, POLYARRAY *pa);
#endif // NEW_PARTIAL_PRIM

void FASTCALL PolyArrayPropagateIndex(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayPropagateSameIndex(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayPropagateSameColor(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayPropagateColor(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayProcessEye(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayProcessEdgeFlag(POLYARRAY *pa);

void FASTCALL PolyArrayComputeFog(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayApplyMaterials(__GLcontext *gc, POLYARRAY *pa);
void FASTCALL PolyArrayCalcLightCache(__GLcontext *gc);
GLuint FASTCALL PolyArrayCheckClippedPrimitive(__GLcontext *gc, POLYARRAY *pa, GLuint andCodes);
POLYARRAY * FASTCALL PolyArrayRemoveClippedPrimitives(POLYARRAY *pa0);

void RestoreAfterMcd(__GLGENcontext *gengc,
                     POLYARRAY *paBegin, POLYARRAY *paEnd);

// Turn on clipcode optimization
#define POLYARRAY_AND_CLIPCODES     1

// Some assertions used in this code

// ASSERT_PRIMITIVE
#if !((GL_POINTS         == 0x0000)     \
   && (GL_LINES          == 0x0001)     \
   && (GL_LINE_LOOP      == 0x0002)     \
   && (GL_LINE_STRIP     == 0x0003)     \
   && (GL_TRIANGLES      == 0x0004)     \
   && (GL_TRIANGLE_STRIP == 0x0005)     \
   && (GL_TRIANGLE_FAN   == 0x0006)     \
   && (GL_QUADS          == 0x0007)     \
   && (GL_QUAD_STRIP     == 0x0008)     \
   && (GL_POLYGON        == 0x0009))
#error "bad primitive ordering\n"
#endif

// ASSERT_FACE
#if !((__GL_FRONTFACE == 0) && (__GL_BACKFACE == 1))
#error "bad face ordering\n"
#endif

// ASSERT_MATERIAL
#if !((POLYARRAY_MATERIAL_FRONT == POLYDATA_MATERIAL_FRONT)      \
   && (POLYARRAY_MATERIAL_BACK  == POLYDATA_MATERIAL_BACK))
#error "bad material mask\n"
#endif

// ASSERT_VERTEX
#if !((POLYARRAY_VERTEX2 == POLYDATA_VERTEX2)   \
   && (POLYARRAY_VERTEX3 == POLYDATA_VERTEX3)   \
   && (POLYARRAY_VERTEX4 == POLYDATA_VERTEX4))
#error "bad vertex flags\n"
#endif

//!!! Set it to 0!
#define ENABLE_PERF_CHECK 0
#if ENABLE_PERF_CHECK
// Performance check macro
#define PERF_CHECK(expr,str)            \
    {                                   \
        static BOOL bPrinted = FALSE;   \
        if (!(expr) && !bPrinted)       \
        {                               \
            bPrinted = TRUE;            \
            WARNING("PERF_CHECK: " str);\
        }                               \
    }
#else
#define PERF_CHECK(expr,str)
#endif // ENABLE_PERF_CHECK

// Copy processed vertex.
#define PA_COPY_PROCESSED_VERTEX(pdDst,pdSrc)                   \
    {                                                           \
        *(pdDst) = *(pdSrc);                                    \
        /* must update color pointer for polygon to work! */    \
        (pdDst)->color = &(pdDst)->colors[__GL_FRONTFACE];      \
    }
#define PA_COPY_VERTEX(pdDst,pdSrc)     PA_COPY_PROCESSED_VERTEX(pdDst,pdSrc)

#define PD_ARRAY(ary, idx) \
    ((POLYDATA *)((GLubyte *)(ary)+(sizeof(POLYDATA) * idx)))
#define PD_VERTEX(ary, idx) \
    ((__GLvertex *)((GLubyte *)(ary)+(sizeof(__GLvertex) *idx)))

#ifndef NEW_PARTIAL_PRIM
// Poly array draw routines.
// ASSERT_PRIMITIVE
PFN_POLYARRAYDRAW afnPolyArrayDraw[] =
{
    (PFN_POLYARRAYDRAW) PolyArrayDrawPoints,
    (PFN_POLYARRAYDRAW) PolyArrayDrawLines,
    (PFN_POLYARRAYDRAW) PolyArrayDrawLLoop,
    (PFN_POLYARRAYDRAW) PolyArrayDrawLStrip,
    (PFN_POLYARRAYDRAW) PolyArrayDrawTriangles,
    (PFN_POLYARRAYDRAW) PolyArrayDrawTStrip,
    (PFN_POLYARRAYDRAW) PolyArrayDrawTFan,
    (PFN_POLYARRAYDRAW) PolyArrayDrawQuads,
    (PFN_POLYARRAYDRAW) PolyArrayDrawQStrip,
    (PFN_POLYARRAYDRAW) PolyArrayDrawPolygon,
};
#endif // NEW_PARTIAL_PRIM

// READ THIS NOTE BEFORE YOU MAKE ANY CHANGES!
//
// NOTE: This function is also called by RasterPos to compute its associated
//       color and texture coordinates!
//       This code has to update current values and material even if there is
//       no vertex.

//!!! special case provoking vertex?

void APIPRIVATE __glim_DrawPolyArray(void *_pa0)
{
    __GLtransform *trMV;
    __GLmatrix    *m, *mEye;
    GLuint        enables;
    GLuint        paNeeds;
    GLuint        orCodes, andCodes;
    GLuint        paflagsAll;
    POLYDATA      *pd;
    POLYARRAY     *pa0 = (POLYARRAY *) _pa0;
    POLYARRAY     *pa;
    PFN_XFORM     pfnXformEye;
    PFN_XFORMBATCH pfnXform;
    GLuint (FASTCALL *clipCheck)(__GLcontext *gc, POLYARRAY *pa,
                                 POLYDATA *pdLast);

    __GLmatrix    *mInv;
    GLboolean     doEye;
    __GLcolor     scaledUserColor;
    GLuint        paFlags;
    __GLcolor     *pScaledUserColor;
    __GLcoord     *pCurrentNormal;
    __GLcoord     *pCurrentTexture;
    GLboolean     bXformLightToNorm = FALSE;
    GLuint        primFlags;
    BOOL          bMcdProcessDone;
    BOOL          bIsRasterPos;
    POLYARRAY*    paPrev = 0;

    __GL_SETUP();

    // Crank down the fpu precision to 24-bit mantissa to gain front-end speed.
    // This will only affect code which relies on double arithmetic.  Also,
    // mask off FP exceptions:

    FPU_SAVE_MODE();
    FPU_PREC_LOW_MASK_EXCEPTIONS();

// There are 3 possible begin modes.  If we are in the begin/end bracket,
// it is __GL_IN_BEGIN.  If we are not in the begin/end bracket, it is either
// __GL_NOT_IN_BEGIN or __GL_NEED_VALIDATE.
// Validation should only be done inside the display lock!

    ASSERTOPENGL(gc->beginMode != __GL_IN_BEGIN, "bad beginMode!");

    if (gc->beginMode == __GL_NEED_VALIDATE)
        (*gc->procs.validate)(gc);

    gc->beginMode = __GL_IN_BEGIN;

    // Initialize variables.

    enables = gc->state.enables.general;

    paNeeds = gc->vertex.paNeeds;

    paflagsAll = 0;

    // Need to save this flag because pa0 can be modified later,
    // possibly dropping the flag.
    bIsRasterPos = pa0->flags & POLYARRAY_RASTERPOS;

// ---------------------------------------------------------
// Update final current values and initialize current values at index 0
// if not given.  Material changes are updated later.

    paFlags = 0;

    if (!gc->modes.colorIndexMode) {
        __GL_SCALE_AND_CHECK_CLAMP_RGBA(scaledUserColor.r,
                                        scaledUserColor.g,
                                        scaledUserColor.b,
                                        scaledUserColor.a,
                                        gc, paFlags,
                                        gc->state.current.userColor.r,
                                        gc->state.current.userColor.g,
                                        gc->state.current.userColor.b,
                                        gc->state.current.userColor.a);
        pScaledUserColor = &scaledUserColor;
    } else {
        __GL_CHECK_CLAMP_CI(scaledUserColor.r, gc, paFlags, gc->state.current.userColorIndex);
    }

    pCurrentNormal = &gc->state.current.normal;
    pCurrentTexture = &gc->state.current.texture;
    primFlags = 0;

    // Optimization Possibility:
    // Currently, for every Primitive, we check to see if any of the
    // Attributes have been set by the evaluator. This could be potentially
    // optimized by having two versions of this loop (perhaps in a macro or
    // a function call); one which makes the checks and the other which doesnt.
    // If no evaluator is enabled, we could call the faster version (with
    // no checks)

    for (pa = pa0; pa; pa = pa->paNext)
    {
        POLYDATA *pd0;

        pd0 = pa->pd0;
        if (gc->modes.colorIndexMode)
        {
            // CI mode.
            // Update final current RGBA color incase one is given.

            if (pa->flags & POLYARRAY_OTHER_COLOR)
                gc->state.current.userColor = pa->otherColor;

            // Update final current CI color.

            if (!(pd0->flags & POLYDATA_COLOR_VALID))
            {
                pd0->flags |= POLYDATA_COLOR_VALID;
                pd0->colors[0].r = gc->state.current.userColorIndex;
                pa->flags |= paFlags;
            }

            // Update current color. pdCurColor could be NULL is there
            // were no glColor calls.
            if (pa->pdCurColor)
            {
                gc->state.current.userColorIndex = pa->pdCurColor->colors[0].r;
            }

            paFlags = (pa->flags & POLYARRAY_CLAMP_COLOR);
        }
        else
        {
            // RGBA mode.
            // Update final current CI color in case one is given.

            if (pa->flags & POLYARRAY_OTHER_COLOR)
                gc->state.current.userColorIndex = pa->otherColor.r;

            // Update final current RGBA color.

            if (!(pd0->flags & POLYDATA_COLOR_VALID))
            {
                pd0->flags |= POLYDATA_COLOR_VALID;
                pd0->colors[0] = *pScaledUserColor;
                pa->flags |= paFlags;
            }

            // Update current color. pdCurColor could be NULL is there
            // were no glColor calls.
            if (pa->pdCurColor)
            {
                pScaledUserColor = &pa->pdCurColor->colors[0];
            }

            paFlags = (pa->flags & POLYARRAY_CLAMP_COLOR);
        }

        // Update final current normal.

        if (!(pd0->flags & POLYDATA_NORMAL_VALID))
        {
            if (paNeeds & PANEEDS_NORMAL) {
                pd0->flags |= POLYDATA_NORMAL_VALID;
                // can also be pd0->normal = gc->state.current.normal!
                pd0->normal.x = pCurrentNormal->x;
                pd0->normal.y = pCurrentNormal->y;
                pd0->normal.z = pCurrentNormal->z;
            }
        }

        // Update current normal. pdCurNormal could be NULL if there
        // were no glNormal calls.
        if (pa->pdCurNormal)
        {
            pCurrentNormal = &pa->pdCurNormal->normal;
        }

        // Update final current texture coordinates.

        if (!(pd0->flags & POLYDATA_TEXTURE_VALID))
        {
            if (paNeeds & PANEEDS_TEXCOORD) {
                pd0->flags |= POLYDATA_TEXTURE_VALID;
                pd0->texture = *pCurrentTexture;

                if (__GL_FLOAT_COMPARE_PONE(pd0->texture.w, !=))
                    pa->flags |= POLYARRAY_TEXTURE4;
                else if (__GL_FLOAT_NEZ(pd0->texture.z))
                    pa->flags |= POLYARRAY_TEXTURE3;
                else if (__GL_FLOAT_NEZ(pd0->texture.y))
                    pa->flags |= POLYARRAY_TEXTURE2;
                else
                    pa->flags |= POLYARRAY_TEXTURE1;
            }
        }

        // Update current texture. pdCurTexture could be NULL if there
        // were no glTexture calls.
        if (pa->pdCurTexture)
        {
            pCurrentTexture = &pa->pdCurTexture->texture;
        }

        /*
         * Update current pointers. They have to point to the latest valid data.
         */
        if (pa->pdCurColor < pa->pdLastEvalColor)
        {
            pa->pdCurColor = pa->pdLastEvalColor;
        }
        if (pa->pdCurNormal < pa->pdLastEvalNormal)
        {
            pa->pdCurNormal = pa->pdLastEvalNormal;
        }
        if (pa->pdCurTexture < pa->pdLastEvalTexture)
        {
            pa->pdCurTexture = pa->pdLastEvalTexture;
        }
        // Update the texture key for hardware accelaration:

        pa->textureKey = gc->textureKey;

        // Update final current edge flag.

        if (!(pd0->flags & POLYDATA_EDGEFLAG_VALID))
        {
            if (gc->state.current.edgeTag)
                pd0->flags |= POLYDATA_EDGEFLAG_VALID | POLYDATA_EDGEFLAG_BOUNDARY;
            else
                pd0->flags |= POLYDATA_EDGEFLAG_VALID;
        }

        if (pa->pdCurEdgeFlag)
        {
            gc->state.current.edgeTag = (GLboolean)
                (pa->pdCurEdgeFlag->flags & POLYDATA_EDGEFLAG_BOUNDARY);
        }

        // Accumulate pa flags.

        paflagsAll |= pa->flags;

        // Accumulate primitive type bits
        primFlags |= 1 << pa->primType;

        if (pa->pd0 == pa->pdNextVertex)
        {
        // The polyarray has no vertices.
        // We have to apply material changes if there were any between BEGIN/END
        // and remove the polyarray from the chain
            if (pa->flags & (POLYARRAY_MATERIAL_FRONT | POLYARRAY_MATERIAL_BACK))
                PolyArrayApplyMaterials(gc, pa);
            if (paPrev)
                paPrev->paNext = pa->paNext;
            else
                pa0 = pa->paNext;
            PolyArrayRestoreColorPointer(pa);
        }
        else
        {
            paPrev = pa;
        }
    }

    // Store the normalized user color:

    if (!gc->modes.colorIndexMode)
    {
        gc->state.current.userColor.r = pScaledUserColor->r * gc->oneOverRedVertexScale;
        gc->state.current.userColor.g = pScaledUserColor->g * gc->oneOverGreenVertexScale;
        gc->state.current.userColor.b = pScaledUserColor->b * gc->oneOverBlueVertexScale;
        gc->state.current.userColor.a = pScaledUserColor->a * gc->oneOverAlphaVertexScale;
    }

    gc->state.current.normal.x = pCurrentNormal->x;
    gc->state.current.normal.y = pCurrentNormal->y;
    gc->state.current.normal.z = pCurrentNormal->z;

    gc->state.current.texture = *pCurrentTexture;

    // All polyarrays could be removed if they had no vertices
    if (!pa0)
    {
        bXformLightToNorm = FALSE;
        goto drawpolyarray_exit;
    }

    //
    // Get the modeling matrix:
    //

    trMV = gc->transform.modelView;


    // ---------------------------------------------------------
    //
    // Allow MCD 2.0 to do transform and light if possible.
    // Don't try it for rasterpos calls.
    //

    bMcdProcessDone = FALSE;

#if MCD_VER_MAJOR >= 2
    if (((__GLGENcontext *)gc)->pMcdState != NULL &&
        McdDriverInfo.mcdDriver.pMCDrvProcess != NULL &&
        gc->renderMode == GL_RENDER &&
        !bIsRasterPos)
#else
    if (0)
#endif
    {
        POLYMATERIAL *pm;
        PDMATERIAL *pdMat;
        POLYARRAY *paEnd;

        // If no material changes have ever been seen then there
        // won't be a polymaterial at all.
        pm = GLTEB_CLTPOLYMATERIAL();
        if (pm != NULL)
        {
            pdMat = pm->pdMaterial0;
        }
        else
        {
            pdMat = NULL;
        }

        paEnd = GenMcdProcessPrim((__GLGENcontext *)gc,
                                  pa0, paflagsAll, primFlags,
                                  (MCDTRANSFORM *)trMV,
                                  (MCDMATERIALCHANGES *)pdMat);

        RestoreAfterMcd((__GLGENcontext *)gc, pa0, paEnd);
        bMcdProcessDone = TRUE;

        if (paEnd == NULL)
        {
            goto drawpolyarray_exit;
        }
        else
        {
            // If MCDrvProcess kicks back we will not
            // call MCDrvDraw.  We could check for non-generic
            // here and abandon the batch, saving the front-end processing.
            // I don't think it's worth it since kicking back on
            // a non-generic format is basically a driver bug.
            pa0 = paEnd;
        }
    }


// ---------------------------------------------------------
// Initialize the normal matrix:
// Normals are not needed after color assignment and texture generation!
// The above is not true anymore. You need Normals for true PHONG shading.
// IN:  normal matrix
// OUT: normal matrix (processed)

    if (paNeeds & (PANEEDS_NORMAL | PANEEDS_NORMAL_FOR_TEXTURE))
    {
        if (trMV->flags & XFORM_UPDATE_INVERSE)
            __glComputeInverseTranspose(gc, trMV);
        gc->mInv = mInv = &trMV->inverseTranspose;
    }
#if DBG
    else
        gc->mInv = mInv = (__GLmatrix *) -1;
#endif

// ---------------------------------------------------------
// Find out is we have to transform normals for lighting
// We can only do lighting in object space if:
//      we're using infinite lighting AND
//      we're not doing two-sided lighting AND
//      we're rendering AND
//      the transformation matrix has unity scaling
//
    bXformLightToNorm =
        (gc->vertex.paNeeds & PANEEDS_NORMAL) &&
        (gc->renderMode == GL_RENDER) &&
        (mInv->nonScaling) &&
        ((paNeeds & (PANEEDS_FRONT_COLOR | PANEEDS_BACK_COLOR)) ==
                    PANEEDS_FRONT_COLOR) &&
        ((gc->procs.paCalcColor == PolyArrayFastCalcRGBColor) ||
         (gc->procs.paCalcColor == PolyArrayZippyCalcRGBColor) ||
         (gc->procs.paCalcColor == PolyArrayFastCalcCIColor));

// Transform normals for spherical map texture generation
//
    if (paNeeds & PANEEDS_NORMAL_FOR_TEXTURE)
    {
    // If we transform normals for texture, we have to process lighting in camera space
        bXformLightToNorm = FALSE;
    // Now transform normals
        for (pa = pa0; pa; pa = pa->paNext)
        {
            if (!(enables & __GL_NORMALIZE_ENABLE))
                (*mInv->xfNormBatch)(pa, mInv);
            else
                (*mInv->xfNormBatchN)(pa, mInv);
        }
        paNeeds &= ~PANEEDS_NORMAL;
    }

// ---------------------------------------------------------
// Process texture coordinates.  We need to do this while we still have
// valid object coordinate data.  If we need normals to perform the texture
// generation, we also transform the normals.
//
// Texture coordinates are modified in place.
//
// IN:  texture, obj, (eye), normal
// OUT: texture, (eye)

    if (paNeeds & PANEEDS_TEXCOORD)
    {
        if ((gc->procs.paCalcTexture == PolyArrayCalcTexture) &&
            (gc->transform.texture->matrix.matrixType == __GL_MT_IDENTITY)) {

            for (pa = pa0; pa; pa = pa->paNext)
            {
                PERF_CHECK(!(pa->flags & (POLYARRAY_TEXTURE3 | POLYARRAY_TEXTURE4)),
                           "Uses r, q texture coordinates!\n");

                // If all incoming vertices have valid texcoords, and texture
                // matrix is identity, and texgen is disabled, we are done.
                if ((pa->flags & POLYARRAY_SAME_POLYDATA_TYPE)
                    && (pa->pdCurTexture != pa->pd0)
                // Need to test 2nd vertex because pdCurTexture may have been
                // advanced as a result of combining TexCoord command after End
                    && ((pa->pd0 + 1)->flags & POLYDATA_TEXTURE_VALID))
                  ;
                else
                    PolyArrayCalcTexture(gc, pa);
            }
        } else {
            for (pa = pa0; pa; pa = pa->paNext)
            {
                PERF_CHECK(!(pa->flags & (POLYARRAY_TEXTURE3 | POLYARRAY_TEXTURE4)),
                           "Uses r, q texture coordinates!\n");

                (*gc->procs.paCalcTexture)(gc, pa);
            }
        }
    }

    //
    // Process the eye coordinate if:
    //   user clip planes are enabled
    //   we're processing RASTERPOS
    //   we have slow lighting which needs the eye coordinate
    //
    // We need to process the eye coordinate here because the
    // object coordinate gets trashed by the initial obj->clip
    // transform.
    //
    //
    //

    clipCheck = gc->procs.paClipCheck;

    // Compute eye coord first
    // We need eye coordinates to do user clip plane clipping
    if ((clipCheck == PAClipCheckAll) ||
        bIsRasterPos ||
        (gc->procs.paCalcColor == PolyArrayCalcCIColor) ||
        (gc->procs.paCalcColor == PolyArrayCalcRGBColor) ||
#ifdef GL_WIN_phong_shading
        (gc->polygon.shader.phong.flags & __GL_PHONG_NEED_EYE_XPOLATE) ||
#endif //GL_WIN_phong_shading
        (enables & __GL_FOG_ENABLE && gc->renderMode == GL_RENDER))
    {
        mEye = &trMV->matrix;

        if (paflagsAll & POLYARRAY_VERTEX4)
            pfnXformEye = mEye->xf4;
        else if (paflagsAll & POLYARRAY_VERTEX3)
            pfnXformEye = mEye->xf3;
        else
            pfnXformEye = mEye->xf2;

        doEye = TRUE;
    } else
        doEye = FALSE;


    // If any incoming coords contains w coord, use xf4.

    m = &trMV->mvp;

    if (paflagsAll & POLYARRAY_VERTEX4)
        pfnXform = (void*)m->xf4Batch;
    else if (paflagsAll & POLYARRAY_VERTEX3)
        pfnXform = (void*)m->xf3Batch;
    else
        pfnXform = (void*)m->xf2Batch;

//---------------------------------------------------------------------------
// If normalization is on, we will handle it here in one pass.  We will
// then transform the light into normal space
// flag.  Note that we need to save the original light values away so
// we can restore them before we exit.
//
    if (bXformLightToNorm)
    {
        __GLlightSourceMachine *lsm;
        LONG i;
        __GLmatrix matrix2;

        __glTranspose3x3(&matrix2, &trMV->matrix);
        for (i = 0, lsm = gc->light.sources; lsm; lsm = lsm->next, i++) {
            __GLcoord hv;
            __GLmatrix matrix;

            lsm->tmpHHat = lsm->hHat;
            lsm->tmpUnitVPpli = lsm->unitVPpli;


            __glMultMatrix(&matrix,
                           &gc->state.light.source[i].lightMatrix, &matrix2);

            hv = gc->state.light.source[i].position;

            __glXForm3x3(&hv, &hv.x, &matrix);
            __glNormalize(&lsm->unitVPpli.x, &hv.x);

            hv = lsm->unitVPpli;

            hv.x += matrix.matrix[2][0];
            hv.y += matrix.matrix[2][1];
            hv.z += matrix.matrix[2][2];

            __glNormalize(&lsm->hHat.x, &hv.x);
        }
    }

    PolyArrayCalcLightCache(gc);

// ---------------------------------------------------------
// Do transform, color, and lighting calculations.
//
// This is the heart of the rendering pipeline, so we try
// to do as many operations as possible while touching the
// least amount of memory to reduce cache affects.
//
// If it is phong-shading, dont update materials and dont do
// lighting.
// ---------------------------------------------------------

    for (pa = pa0; pa; pa = pa->paNext)
    {
        POLYDATA *pdLast;

#ifdef NEW_PARTIAL_PRIM
        pa->flags |= POLYARRAY_RENDER_PRIMITIVE;    // Needed for MCD
#endif
        pdLast = pa->pdNextVertex - 1;

// ---------------------------------------------------------
// Process the eye coordinate if we will need it in the
// pipeline and haven't yet processed it in texture generation.
// We have to do this before we trash the object coord in the
// next phase.
//
// IN:  obj
// OUT: eye

        if (doEye && !(pa->flags & POLYARRAY_EYE_PROCESSED)) {

            pa->flags |= POLYARRAY_EYE_PROCESSED;

            if (mEye->matrixType == __GL_MT_IDENTITY) {
                for (pd = pa->pd0; pd <= pdLast; pd++)
                    pd->eye = pd->obj;
            } else {
                for (pd = pa->pd0; pd <= pdLast; pd++)
                    (*pfnXformEye)(&pd->eye, (__GLfloat *) &pd->obj, mEye);
            }
        }

// ---------------------------------------------------------
// Process the object coordinate.  This generates the clip
// and window coordinates, along with the clip codes.
//
// IN:  obj (destroyed)
// OUT: clip, window

        orCodes  = 0;   // accumulate all clip codes
#ifdef POLYARRAY_AND_CLIPCODES
        andCodes = (GLuint) -1;
#endif


        if (m->matrixType == __GL_MT_IDENTITY)
        {
            // pd->clip = pd->obj;
            ASSERTOPENGL(&pd->clip == &pd->obj, "bad clip offset\n");
        }
        else
           (*pfnXform)(&pa->pd0->clip, &pdLast->clip, m);

        pa->orClipCodes  = 0;
        pa->andClipCodes = (GLuint)-1;

        if (clipCheck != PAClipCheckFrustum2D)
        {
            if (m->matrixType != __GL_MT_GENERAL &&
                !(pa->flags & POLYDATA_VERTEX4)  &&
                clipCheck != PAClipCheckAll)
                andCodes = PAClipCheckFrustumWOne(gc, pa, pdLast);
            else
                andCodes = (*clipCheck)(gc, pa, pdLast);
        }
        else
        {
            if (pa->flags & (POLYDATA_VERTEX3 | POLYDATA_VERTEX4))
                andCodes = PAClipCheckFrustum(gc, pa, pdLast);
            else
                andCodes = PAClipCheckFrustum2D(gc, pa, pdLast);
        }
#ifdef POLYARRAY_AND_CLIPCODES
        if (andCodes)
        {
            andCodes = PolyArrayCheckClippedPrimitive(gc, pa, andCodes);
            // add POLYARRAY_REMOVE_PRIMITIVE flag
            paflagsAll |= pa->flags;
        }
        pa->andClipCodes = andCodes;
#endif

// ---------------------------------------------------------
// Process colors and materials if we're not in selection and
// haven't been completely clipped out.
//
// IN:  obj/eye, color (front), normal
// OUT: (normal), color (front and back)

        if (!(pa->flags & POLYARRAY_REMOVE_PRIMITIVE) &&
            !(paNeeds & PANEEDS_CLIP_ONLY))
        {
            if (!(enables & __GL_LIGHTING_ENABLE))
            {
                // Lighting is disabled.
                // Clamp RGBA colors, mask color index values.
                // Only front colors are computed, back colors are not needed.

                if (paNeeds & PANEEDS_SKIP_LIGHTING)
                {
                    // Note that when lighting calculation is skipped,
                    // we still need to fill in the colors field.
                    // Otherwise, the rasterization routines may get FP
                    // exceptions on invalid colors.

                    pa->flags |= POLYARRAY_SAME_COLOR_DATA;
                    (*gc->procs.paCalcColorSkip)(gc, pa, __GL_FRONTFACE);
                }
                else if (pa->flags & POLYARRAY_SAME_COLOR_DATA)
                {
                    if (gc->modes.colorIndexMode)
                        PolyArrayPropagateSameIndex(gc, pa);
                    else
                        PolyArrayPropagateSameColor(gc, pa);
                }
                else if (gc->modes.colorIndexMode)
                {
                    PolyArrayPropagateIndex(gc, pa);
                }
                else
                {
                    PolyArrayPropagateColor(gc, pa);
                }
            }
            else
            {
            // It is time to transform and normalize normals if nesessary
                if (bXformLightToNorm)
                {
                    if(enables & __GL_NORMALIZE_ENABLE)
                    {
                        __glNormalizeBatch(pa);
                    }
                }
                else
                {
                    if (paNeeds & PANEEDS_NORMAL)
                    {
                        if (!(enables & __GL_NORMALIZE_ENABLE))
                            (*mInv->xfNormBatch)(pa, mInv);
                        else
                            (*mInv->xfNormBatchN)(pa, mInv);
                    }
                }
#ifdef GL_WIN_phong_shading
                // if phong-shading, then do this at rendering time
                // else do it here
                if (!(gc->state.light.shadingModel == GL_PHONG_WIN)
                    || (pa->primType <= GL_POINTS))
#endif //GL_WIN_phong_shading
                {

                    // Lighting is enabled.

                    POLYDATA  *pd1, *pd2, *pdN;
                    GLint     face;
                    GLuint    matMask;
                    GLboolean doFrontColor, doBackColor, doColor;

                    // Clear POLYARRAY_SAME_COLOR_DATA flag if lighting is
                    // enabled.

                    pa->flags &= ~POLYARRAY_SAME_COLOR_DATA;

                    pdN = pa->pdNextVertex;

                    // Needs only front color for points and lines.

                    // ASSERT_PRIMITIVE
                    if ((unsigned int) pa->primType <= GL_LINE_STRIP)
                    {
                        doFrontColor = GL_TRUE;
                        doBackColor  = GL_FALSE;
                    }
                    else
                    {
                        doFrontColor = paNeeds & PANEEDS_FRONT_COLOR;
                        doBackColor  = paNeeds & PANEEDS_BACK_COLOR;
                    }

                    // Process front and back colors in two passes.
                    // Do back colors first!
                    //!!! We can potentially optimize 2-sided lighting in the
                    // slow path by running through all vertices and look for
                    // color needs for each vertex!
                    // See RenderSmoothTriangle.

                    PERF_CHECK
                      (
                       !(doFrontColor && doBackColor),
                       "Two-sided lighting - need both colors!\n"
                       );

                    // ASSERT_FACE
                    // ASSERT_MATERIAL
                    for (face = 1,
                           matMask = POLYARRAY_MATERIAL_BACK,
                           doColor = doBackColor;
                         face >= 0;
                         face--,
                           matMask = POLYARRAY_MATERIAL_FRONT,
                           doColor = doFrontColor
                         )
                    {
                        POLYMATERIAL  *pm;

                        if (!doColor)
                            continue;

                        // If color is not needed, fill in the colors field
                        // with default.

                        if (paNeeds & PANEEDS_SKIP_LIGHTING)
                        {
                            (*gc->procs.paCalcColorSkip)(gc, pa, face);
                            continue;
                        }

                        // Process color ranges that include no material
                        // changes (excluding color material) one at a time.
                        // Color material changes are handled in the color
                        // procs.

                        if (!(pa->flags & matMask))
                        {
                            // process the whole color array
                            (*gc->procs.paCalcColor)(gc, face, pa, pa->pd0,
                                                     pdN - 1);
                            continue;
                        }

                        // There are material changes, we need to recompute
                        // material and light source machine values before
                        // processing the next color range.
                        // Each range below is given by [pd1, pd2-1].
                        //!!! it is possible to fix polyarraycalcrgbcolor to
                        // accept certain material!

                        pm = GLTEB_CLTPOLYMATERIAL();

                        // no need to do this material later
                        pa->flags &= ~matMask;

                        for (pd1 = pa->pd0; pd1 <= pdN; pd1 = pd2)
                        {
                            POLYDATA *pdColor, *pdNormal;

                            // Apply material changes to the current vertex.
                            // It also applies trailing material changes
                            // following the last vertex.
                            if (pd1->flags & matMask)
                                PAApplyMaterial(gc,
                                        *(&pm->pdMaterial0[pd1 -
                                         pa->pdBuffer0].front + face), face);

                            // If this is the trailing material change, we are
                            // done.
                            if (pd1 == pdN)
                                break;

                            // Find next vertex with material changes. We
                            // need to track current color and normal so that
                            // the next color range begins with valid color
                            // and normal. We cannot track current values on
                            // client side because we don't have initial
                            // current values when batching this function.

                            pdColor  = pd1;
                            pdNormal = pd1;
                            for (pd2 = pd1 + 1; pd2 < pdN; pd2++)
                            {
                                // track current color
                                if (pd2->flags & POLYDATA_COLOR_VALID)
                                    pdColor = pd2;

                                // track current normal
                                if (pd2->flags & POLYDATA_NORMAL_VALID)
                                    pdNormal = pd2;

                                if (pd2->flags & matMask)
                                    break;
                            }

                            // Update next vertex's current color and normal
                            // if not given. The paCalcColor proc assumes that
                            // the first vertex contains a valid current color
                            // and normal.  We need to save the current values
                            // before they are modified by the color procs.

                            if (!(pd2->flags & POLYDATA_COLOR_VALID))
                            {
                                pd2->flags |= POLYDATA_COLOR_VALID;
                                pd2->colors[0] = pdColor->colors[0];
                            }

                            if (!(pd2->flags & POLYDATA_NORMAL_VALID))
                            {
                                pd2->flags |= POLYDATA_NORMAL_VALID;
                                pd2->normal.x = pdNormal->normal.x;
                                pd2->normal.y = pdNormal->normal.y;
                                pd2->normal.z = pdNormal->normal.z;
                            }

                            // Compute the colos range [pd1, pd2-1] that
                            // contains no material changes.
                            (*gc->procs.paCalcColor)(gc, face, pa, pd1, pd2-1);
                        }
                    } // for (faces)

                } // Not phong-shading
#ifdef GL_WIN_phong_shading
                else
                {
                    PolyArrayPhongPropagateColorNormal(gc, pa);
                }
#endif //GL_WIN_phong_shading
            } // lighting enabled
        }

        // Update material.
        if ((pa->flags & (POLYARRAY_MATERIAL_FRONT |
                         POLYARRAY_MATERIAL_BACK))
#ifdef GL_WIN_phong_shading
            && ((gc->state.light.shadingModel != GL_PHONG_WIN)
                || (pa->primType <= GL_POINTS))
#endif //GL_WIN_phong_shading
            )
            PolyArrayApplyMaterials(gc, pa);
    } // end of transform, color, and lighting calculations.

// ---------------------------------------------------------
// This is the end of the main pipeline loop.  At this point,
// we need to take care of selection, removal of rejected
// primitives, cheap fog, and edge-flag processing.
// ---------------------------------------------------------


    // In selection, we need only clip and window (and possibly eye values
    // computed above.)  At this point, we have already applied materials as
    // well. But we still need to apply materials and colors.

    if (paNeeds & PANEEDS_CLIP_ONLY)
        goto drawpolyarray_render_primitives;

    // If any of the andClipCodes is nonzero, we may be able to throw away
    // some primitives.

#ifdef POLYARRAY_AND_CLIPCODES
    if (paflagsAll & POLYARRAY_REMOVE_PRIMITIVE)
    {
        pa0 = PolyArrayRemoveClippedPrimitives(pa0);
        if (!pa0)
            goto drawpolyarray_apply_color;
    }
#endif


// ---------------------------------------------------------
// Process cheap fog.
//
// IN:  obj/eye, color
// OUT: eye, fog, color

    // if this is changed, need to fix RasterPos's setup!
    if ((gc->renderMode == GL_RENDER)
        && (enables & __GL_FOG_ENABLE)
        && (gc->polygon.shader.modeFlags & (__GL_SHADE_INTERP_FOG |
                                            __GL_SHADE_CHEAP_FOG)))
    {
        for (pa = pa0; pa; pa = pa->paNext)
        {
            // Note: the eye coordinate has already been computed.

            // compute fog values
            PolyArrayComputeFog(gc, pa);

            if (gc->polygon.shader.modeFlags & __GL_SHADE_CHEAP_FOG)
            {
#ifdef GL_WIN_specular_fog
              ASSERTOPENGL (!(gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG), "Cheap fog cannot be done if Specular fog is needed\n");
#endif //GL_WIN_specular_fog


                // Apply fog if it is smooth shading and in render mode.
                // In flat/phong shading, cheap fogging is currently done at
                // render procs we can probably do cheap fog in flat shading
                // here but we will need to compute the provoking colors with
                // z info correctly so we can interpolate in the clipping
                // procs.  It would require rewriting the clipping routines
                // in so_clip.c too!
                if (gc->polygon.shader.modeFlags & __GL_SHADE_SMOOTH_LIGHT)
                    (*gc->procs.paApplyCheapFog)(gc, pa);
            }
            else
            {
                PERF_CHECK(FALSE, "Uses slow fog\n");
            }
        }
    }

// ---------------------------------------------------------
// Process edge flags.
//
// IN:  edge
// OUT: edge (all vertices)

    if (paNeeds & PANEEDS_EDGEFLAG)
    {
        for (pa = pa0; pa; pa = pa->paNext)
        {
            if (pa->primType == GL_TRIANGLES
                || pa->primType == GL_QUADS
                || pa->primType == GL_POLYGON)
            {
                // If all incoming vertices have valid edgeflags, we are done.
                // When all polydata's are of the same type, there are 2 cases
                // where edge flag processing can be skipped:
                //   1. All edge flags were given.
                //   2. No edge flag was given and the initial edge flag (i.e.
                //      current gc edge flag) is non boundary.  In this case,
                //      all edge flags were set to non boundary in pd->flags
                //      initialization.
              if ((pa->flags & POLYARRAY_SAME_POLYDATA_TYPE)
                  && (((pa->pdCurEdgeFlag != pa->pd0) &&
                       // Need to test 2nd vertex because pdCurEdgeFlag may
                       // have been advanced as a result of combining EdgeFlag
                       // command after End
                       ((pa->pd0 + 1)->flags & POLYDATA_EDGEFLAG_VALID))
                      || !(pa->pd0->flags & POLYDATA_EDGEFLAG_BOUNDARY)))
                ;
              else
                  PolyArrayProcessEdgeFlag(pa);
#ifdef NEW_PARTIAL_PRIM
              // For partial begin polygon we have to clear edge flag for first vertex.
              // For partial end polygon we have to clear edge flag for last vertex.
              //
              if (pa->primType == GL_POLYGON)
              {
                    if (pa->flags & POLYARRAY_PARTIAL_END)
                        (pa->pdNextVertex-1)->flags &= ~POLYDATA_EDGEFLAG_BOUNDARY;
                    if (pa->flags & POLYARRAY_PARTIAL_BEGIN)
                        pa->pd0->flags &= ~POLYDATA_EDGEFLAG_BOUNDARY;
              }
#endif // NEW_PARTIAL_PRIM
            }
        }
    }

// ---------------------------------------------------------
// Process the primitives.

drawpolyarray_render_primitives:

    // Skip the rest if this is a RasterPos
    if (bIsRasterPos)
        goto drawpolyarray_exit;

#ifndef NEW_PARTIAL_PRIM
    for (pa = pa0; pa; pa = pa->paNext)
    {
        ASSERTOPENGL(pa->primType >= GL_POINTS && pa->primType <= GL_POLYGON,
                     "DrawPolyArray: bad primitive type\n");

        (*afnPolyArrayDraw[pa->primType])(gc, pa);
    }
#endif // NEW_PARTIAL_PRIM
// ---------------------------------------------------------
// Update final light source machine.
// The user color was initialized above.

#ifndef GL_WIN_phong_shading
drawpolyarray_apply_color:
    (*gc->procs.applyColor)(gc);
#endif //GL_WIN_phong_shading

// ---------------------------------------------------------
// Flush the primitive chain.

    // To draw primitives, we can let the FPU run in chop (truncation) mode
    // since we have enough precision left to convert to pixel units.

    FPU_CHOP_ON_PREC_LOW();

#if 1
    if (pa0)
        glsrvFlushDrawPolyArray(pa0, bMcdProcessDone);
#endif

drawpolyarray_exit:
    // Out of begin mode.
#ifdef GL_WIN_phong_shading
drawpolyarray_apply_color:
        (*gc->procs.applyColor)(gc);
#endif //GL_WIN_phong_shading
// Out of begin mode.

    FPU_RESTORE_MODE_NO_EXCEPTIONS();

    ASSERTOPENGL(gc->beginMode == __GL_IN_BEGIN, "bad beginMode!");
    gc->beginMode = __GL_NOT_IN_BEGIN;
//
// If we were using object-space lighting, restore the original lighting values:
//

    if (bXformLightToNorm) {
        __GLlightSourceMachine *lsm;

        for (lsm = gc->light.sources; lsm; lsm = lsm->next) {
            lsm->hHat = lsm->tmpHHat;
            lsm->unitVPpli = lsm->tmpUnitVPpli;
        }
    }

    return;
}


#ifdef POLYARRAY_AND_CLIPCODES
// Determine if a clipped primitive can be removed early.
// If the logical AND of vertex clip codes of a primitive is non-zero,
// the primitive is completely clipped and can be removed early.
// However, if a primitive is partially built, we may not be able to
// remove it yet to maintain connectivity between the partial primitives.
// By eliminating a primitive early, we save on lighting and other calculations.
//
// Set POLYARRAY_REMOVE_PRIMITIVE flag if the primitve can be removed early.
// Return new andCodes.

GLuint FASTCALL PolyArrayCheckClippedPrimitive(__GLcontext *gc, POLYARRAY *pa, GLuint andCodes)
{
    ASSERTOPENGL(andCodes, "bad andCodes\n");

    // Don't eliminate RasterPos

    if (pa->flags & POLYARRAY_RASTERPOS)
        return andCodes;

#ifndef NEW_PARTIAL_PRIM

    // If this is a partial begin, include previous clipcode.

    if (pa->flags & POLYARRAY_PARTIAL_BEGIN)
    {
        switch (pa->primType)
        {
          case GL_LINE_LOOP:
            // previous vertex
            andCodes &= gc->vertex.pdSaved[0].clipCode;
            // loop vertex
            if (!(pa->flags & POLYARRAY_PARTIAL_END))
                andCodes &= gc->vertex.pdSaved[1].clipCode;
            break;

          case GL_POLYGON:
            andCodes &= gc->vertex.pdSaved[2].clipCode;
            // fall through
          case GL_TRIANGLE_FAN:
          case GL_TRIANGLE_STRIP:
          case GL_QUAD_STRIP:
            andCodes &= gc->vertex.pdSaved[1].clipCode;
            // fall through
          case GL_LINE_STRIP:
            andCodes &= gc->vertex.pdSaved[0].clipCode;
            break;

          case GL_POINTS:
          case GL_LINES:
          case GL_TRIANGLES:
          case GL_QUADS:
          default:
            break;
        }
    }
    if (andCodes
      &&
        (
            !(pa->flags & POLYARRAY_PARTIAL_END) ||
            pa->primType == GL_POINTS    ||
            pa->primType == GL_LINES     ||
            pa->primType == GL_TRIANGLES ||
            pa->primType == GL_QUADS
        )
       )
        pa->flags |= POLYARRAY_REMOVE_PRIMITIVE;
#else
    //
    // If we have partial end primitive we cannot remove line strip, line loop or
    // polygon to preserve stipple pattern. Line loop was converted to line strip.
    //
    if (andCodes &&
        !(pa->flags & POLYARRAY_PARTIAL_END &&
         (pa->primType == GL_LINE_STRIP || pa->primType == GL_POLYGON)))
        pa->flags |= POLYARRAY_REMOVE_PRIMITIVE;
#endif // NEW_PARTIAL_PRIM

    // return new andCodes.

    return andCodes;
}

// Remove completely clipped primitives from the polyarray chain.
POLYARRAY * FASTCALL PolyArrayRemoveClippedPrimitives(POLYARRAY *pa0)
{
    POLYARRAY *pa, *paNext, *pa2First, *pa2Last;

    // Eliminate the trivially clipped primitives and build a new pa chain.

    pa2First = pa2Last = NULL;

    for (pa = pa0; pa; pa = paNext)
    {
        // get next pa first
        paNext = pa->paNext;

        if (pa->flags & POLYARRAY_REMOVE_PRIMITIVE)
        {
            PolyArrayRestoreColorPointer(pa);
        }
        else
        {
            // add to the new pa chain

            if (!pa2First)
                pa2First = pa;
            else
                pa2Last->paNext = pa;
            pa2Last = pa;
            pa2Last->paNext = NULL;
        }
    }

    // Return the new pa chain.

    return pa2First;
}
#endif // POLYARRAY_AND_CLIPCODES

/******************************Public*Routine******************************\
*
* RestoreAfterMcd
*
* Handles final bookkeeping necessary after the MCD has processed
* some or all of a batch.
*
* History:
*  Thu Mar 20 12:04:49 1997     -by-    Drew Bliss [drewb]
*   Split from glsrvFlushDrawPolyArray.
*
\**************************************************************************/

void RestoreAfterMcd(__GLGENcontext *gengc,
                     POLYARRAY *paBegin, POLYARRAY *paEnd)
{
    POLYARRAY *pa, *paNext;

    // Restore color pointer in the vertex buffer (for the POLYARRAYs
    // that have been processed by MCD; leave the unprocessed ones
    // alone).
    //
    // If the driver is using DMA, it must do the reset.  If not DMA,
    // we will do it for the driver.

    if (!(McdDriverInfo.mcdDriverInfo.drvMemFlags & MCDRV_MEM_DMA))
    {
        for (pa = paBegin; pa != paEnd; pa = paNext)
        {
            paNext = pa->paNext;
            PolyArrayRestoreColorPointer(pa);
        }
    }
    else
    {
        // With DMA, the driver must either process the entire batch
        // or reject the entire batch.
        //
        // Therefore, if the MCD call returns success (paEnd == NULL),
        // the POLYARRAY is being sent via DMA to the driver and we
        // need to switch to the other buffer.  Otherwise, we need to
        // drop down into the software implementation.

        if (!paEnd)
        {
            GenMcdSwapBatch(gengc);
        }
    }
}

/******************************Public*Routine******************************\
*
* RescaleVertexColorsToBuffer
*
* Scales vertex colors from vertex (MCD) color range to buffer color
* range for software simulations.
*
* History:
*  Thu Mar 20 16:21:16 1997     -by-    Drew Bliss [drewb]
*   Created
*
\**************************************************************************/

void RescaleVertexColorsToBuffer(__GLcontext *gc, POLYARRAY *pa)
{
    int idx;
    POLYDATA *pd, *pdLast;

    idx = 0;
    if (pa->primType <= GL_LINE_STRIP)
    {
        idx |= 1;
    }
    else
    {
        if (gc->vertex.paNeeds & PANEEDS_FRONT_COLOR)
        {
            idx |= 1;
        }
        if (gc->vertex.paNeeds & PANEEDS_BACK_COLOR)
        {
            idx |= 2;
        }
    }

    pdLast = pa->pdNextVertex-1;

    switch(idx)
    {
    case 1:
        // Front color only.

        if (gc->modes.colorIndexMode)
        {
            for (pd = pa->pd0; pd <= pdLast; pd++)
            {
                pd->colors[0].r *= gc->redVertexToBufferScale;
            }
        }
        else
        {
            for (pd = pa->pd0; pd <= pdLast; pd++)
            {
                pd->colors[0].r *= gc->redVertexToBufferScale;
                pd->colors[0].g *= gc->greenVertexToBufferScale;
                pd->colors[0].b *= gc->blueVertexToBufferScale;
                pd->colors[0].a *= gc->alphaVertexToBufferScale;
            }
        }
        break;

    case 2:
        // Back color only.

        if (gc->modes.colorIndexMode)
        {
            for (pd = pa->pd0; pd <= pdLast; pd++)
            {
                pd->colors[1].r *= gc->redVertexToBufferScale;
            }
        }
        else
        {
            for (pd = pa->pd0; pd <= pdLast; pd++)
            {
                pd->colors[1].r *= gc->redVertexToBufferScale;
                pd->colors[1].g *= gc->greenVertexToBufferScale;
                pd->colors[1].b *= gc->blueVertexToBufferScale;
                pd->colors[1].a *= gc->alphaVertexToBufferScale;
            }
        }
        break;

    case 3:
        // Front and back colors.

        if (gc->modes.colorIndexMode)
        {
            for (pd = pa->pd0; pd <= pdLast; pd++)
            {
                pd->colors[0].r *= gc->redVertexToBufferScale;
                pd->colors[1].r *= gc->redVertexToBufferScale;
            }
        }
        else
        {
            for (pd = pa->pd0; pd <= pdLast; pd++)
            {
                pd->colors[0].r *= gc->redVertexToBufferScale;
                pd->colors[0].g *= gc->greenVertexToBufferScale;
                pd->colors[0].b *= gc->blueVertexToBufferScale;
                pd->colors[0].a *= gc->alphaVertexToBufferScale;
                pd->colors[1].r *= gc->redVertexToBufferScale;
                pd->colors[1].g *= gc->greenVertexToBufferScale;
                pd->colors[1].b *= gc->blueVertexToBufferScale;
                pd->colors[1].a *= gc->alphaVertexToBufferScale;
            }
        }
    }
}

/******************************Public*Routine******************************\
* glsrvFlushDrawPolyArray
*
* The dispatch code in glsrvAttention links together the POLYARRAY data
* structures of consecutive glim_DrawPolyArray calls.  The front end
* preprocessing of the vertices in each POLYARRAY is executed immediately
* in glim_DrawPolyArray (i.e., PolyArrayDrawXXX), but the actually back end
* rendering (PolyArrayRenderXXX) is delayed until the chain is broken (either
* by a non-DrawPolyArray call, the end of the batch, or a batch timeout).
*
* glsrvFlushDrawPolyArray is the function that is called to flush the
* chained POLYARRAYs by invoking the back end rendering code.  The back end
* may be the generic software-only implementation or the MCD driver.
*
* History:
*  12-Feb-1996 -by- Gilman Wong [gilmanw]
* Wrote it.
\**************************************************************************/

// Poly array render routines.
// ASSERT_PRIMITIVE
PFN_POLYARRAYRENDER afnPolyArrayRender[] =
{
    (PFN_POLYARRAYRENDER) PolyArrayRenderPoints,
    (PFN_POLYARRAYRENDER) PolyArrayRenderLines,
    (PFN_POLYARRAYRENDER) NULL,         // line loop not required
    (PFN_POLYARRAYRENDER) PolyArrayRenderLStrip,
    (PFN_POLYARRAYRENDER) PolyArrayRenderTriangles,
    (PFN_POLYARRAYRENDER) PolyArrayRenderTStrip,
    (PFN_POLYARRAYRENDER) PolyArrayRenderTFan,
    (PFN_POLYARRAYRENDER) PolyArrayRenderQuads,
    (PFN_POLYARRAYRENDER) PolyArrayRenderQStrip,
    (PFN_POLYARRAYRENDER) PolyArrayRenderPolygon,
};

void APIPRIVATE glsrvFlushDrawPolyArray(POLYARRAY *paBegin,
                                        BOOL bMcdProcessDone)
{
    POLYARRAY *pa, *paNext;
    __GLGENcontext *gengc;
    BOOL bResetViewportAdj = FALSE;
    __GL_SETUP();

//#define FRONT_END_ONLY 1

#if FRONT_END_ONLY

    if (paBegin)
    {
        for (pa = paNext = paBegin; pa = paNext; )
        {
            ASSERTOPENGL(pa->primType >= GL_POINTS &&
                         pa->primType <= GL_POLYGON,
                         "DrawPolyArray: bad primitive type\n");

            // Get next pointer first!
            paNext = pa->paNext;
            // Restore color pointer in the vertex buffer!
            PolyArrayRestoreColorPointer(pa);
        }
    }

    return;
#endif

    gengc = (__GLGENcontext *) gc;

#ifdef _MCD_
#if DBG
    if (gengc->pMcdState && !(glDebugFlags & GLDEBUG_DISABLEPRIM) &&
        (gc->renderMode == GL_RENDER))
#else
    if ((gengc->pMcdState) && (gc->renderMode == GL_RENDER))
#endif
    {
        POLYARRAY *paEnd;

        // If no commands were processed via MCD front-end support
        // then try the rasterization support.
        if (!bMcdProcessDone)
        {
            // Let the MCD driver have first crack.  If the MCD processes
            // the entire batch, then it will return NULL.  Otherwise, it
            // will return a pointer to a chain of unprocessed POLYARRAYs.
            paEnd = GenMcdDrawPrim(gengc, paBegin);
            RestoreAfterMcd(gengc, paBegin, paEnd);
        }
        else
        {
            // MCD has already kicked back so nothing is consumed.
            paEnd = paBegin;
        }

        // Prepare to use generic to provide simulations for the
        // unhandled POLYARRAYs, if any.

        paBegin = paEnd;
        if (paBegin)
        {
            // Check if generic simulations can be used.  If not, we must
            // abandon the rest of the batch.

            if (!(gengc->flags & GENGC_GENERIC_COMPATIBLE_FORMAT) ||
                (gengc->gc.texture.ddtex.levels > 0 &&
                 (gengc->gc.texture.ddtex.flags & DDTEX_GENERIC_FORMAT) == 0))
            {
                goto PA_abandonBatch;
            }

            // If we need to kickback to simulations, now is the time to
            // grab the device lock.  If the lock fails, abandon the rest
            // of the batch.

            {
                __GLbeginMode beginMode = gengc->gc.beginMode;

                // Why save/restore beginMode?
                //
                // The glim_DrawPolyArray function plays with the beginMode
                // value.  However, in delayed locking the MCD state is
                // validated, but the generic state is not properly validated
                // if the lock is not held.  So we need to also play with
                // the beginMode so that the validation code can be called.

                gengc->gc.beginMode = __GL_NOT_IN_BEGIN;

                if (!glsrvLazyGrabSurfaces(gengc, gengc->fsGenLocks))
                {
                    gengc->gc.beginMode = beginMode;
                    goto PA_abandonBatch;
                }

                gengc->gc.beginMode = beginMode;
            }

            // We may need to temporarily reset the viewport adjust values
            // before calling simulations.  If GenMcdResetViewportAdj returns
            // TRUE, the viewport is changed and we need restore later with
            // VP_NOBIAS.

            bResetViewportAdj = GenMcdResetViewportAdj(gc, VP_FIXBIAS);
        }
    }

    if (paBegin)
#endif
    {
        for (pa = paNext = paBegin; pa = paNext; )
        {
            ASSERTOPENGL(/* pa->primType >= GL_POINTS &&  <always true since primType is unsigned> */
                         pa->primType <= GL_POLYGON,
                         "DrawPolyArray: bad primitive type\n");

#ifndef NEW_PARTIAL_PRIM
            if (pa->flags & POLYARRAY_RENDER_PRIMITIVE)
#endif // NEW_PARTIAL_PRIM
            {
                // Rescale colors if necessary.
                if (!gc->vertexToBufferIdentity)
                {
                    RescaleVertexColorsToBuffer(gc, pa);
                }

#ifdef GL_WIN_phong_shading
                if (pa->flags & POLYARRAY_PHONG_DATA_VALID)
                {
                    if (pa->phong->flags & __GL_PHONG_FRONT_FIRST_VALID)
                        PAApplyMaterial(gc,
                                        &(pa->phong->matChange[__GL_PHONG_FRONT_FIRST]),
                                        0);
                    if (pa->phong->flags & __GL_PHONG_BACK_FIRST_VALID)
                        PAApplyMaterial(gc,
                                        &(pa->phong->matChange[__GL_PHONG_BACK_FIRST]),
                                        1);
                }

                (*afnPolyArrayRender[pa->primType])(gc, pa);

                if (pa->flags & POLYARRAY_PHONG_DATA_VALID)
                {
                    if (pa->phong->flags & __GL_PHONG_FRONT_TRAIL_VALID)
                        PAApplyMaterial(gc,
                                        &(pa->phong->matChange[__GL_PHONG_FRONT_TRAIL]),
                                        0);
                    if (pa->phong->flags & __GL_PHONG_BACK_TRAIL_VALID)
                        PAApplyMaterial(gc,
                                        &(pa->phong->matChange[__GL_PHONG_BACK_TRAIL]),
                                        1);
                    //Free the pa->phong data-structure
                    GCFREE(gc, pa->phong);
                }
#else
                (*afnPolyArrayRender[pa->primType])(gc, pa);
#endif //GL_WIN_phong_shading
            }

            // Get next pointer first!
            paNext = pa->paNext;
            // Restore color pointer in the vertex buffer!
            PolyArrayRestoreColorPointer(pa);
        }

        // Restore viewport values if needed.
        if (bResetViewportAdj)
        {
            GenMcdResetViewportAdj(gc, VP_NOBIAS);
        }
    }

    return;

PA_abandonBatch:

    if (paBegin)
    {
    // Abandoning the remainder of the batch.  Must reset the color
    // pointers in the remainder of the batch.
    //
    // Note that paBegin must point to the beginning of the chain of
    // unprocessed POLYARRAYs.

        for (pa = paBegin; pa; pa = paNext)
        {
            paNext = pa->paNext;
            PolyArrayRestoreColorPointer(pa);
        }
        __glSetError(GL_OUT_OF_MEMORY);
    }
}

/****************************************************************************/
// Restore color pointer in the vertex buffer!
// However, don't restore the color pointer if it is a RasterPos call.
GLvoid FASTCALL PolyArrayRestoreColorPointer(POLYARRAY *pa)
{
    POLYDATA  *pd, *pdLast;

    ASSERTOPENGL(!(pa->flags & POLYARRAY_RASTERPOS),
                 "RasterPos unexpected\n");

    // See also glsbResetBuffers.

    // Reset color pointer in output index array
    if (pa->aIndices)
    {
        ASSERTOPENGL((POLYDATA *) pa->aIndices >= pa->pdBuffer0 &&
                     (POLYDATA *) pa->aIndices <= pa->pdBufferMax,
                     "bad index map pointer\n");

        pdLast = (POLYDATA *) (pa->aIndices + pa->nIndices);
        for (pd = (POLYDATA *) pa->aIndices; pd < pdLast; pd++)
            pd->color = &pd->colors[__GL_FRONTFACE];

        ASSERTOPENGL(pd >= pa->pdBuffer0 &&
                     pd <= pa->pdBufferMax + 1,
                     "bad polyarray pointer\n");
    }

    // Reset color pointer in the POLYARRAY structure last!
    ASSERTOPENGL((POLYDATA *) pa >= pa->pdBuffer0 &&
                 (POLYDATA *) pa <= pa->pdBufferMax,
                 "bad polyarray pointer\n");
    ((POLYDATA *) pa)->color = &((POLYDATA *) pa)->colors[__GL_FRONTFACE];
}
/****************************************************************************/
// Compute generic fog value for the poly array.
//
// IN:  eye
// OUT: fog
#ifdef GL_WIN_specular_fog
void FASTCALL PolyArrayComputeFog(__GLcontext *gc, POLYARRAY *pa)
{
    __GLfloat density, density2neg, end, oneOverEMinusS;
    POLYDATA  *pd, *pdLast;
    __GLfloat fog;
    BOOL bNeedModulate = (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG);

    ASSERTOPENGL(pa->flags & POLYARRAY_EYE_PROCESSED, "need eye\n");

    pdLast = pa->pdNextVertex-1;
    switch (gc->state.fog.mode)
    {
    case GL_EXP:
        PERF_CHECK(FALSE, "Uses GL_EXP fog\n");
        density = gc->state.fog.density;
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            __GLfloat eyeZ;

            pd->flags |= POLYDATA_FOG_VALID;    // used by clipping code!
            eyeZ = pd->eye.z;
            if (__GL_FLOAT_LTZ(eyeZ))
                fog = __GL_POWF(__glE,  density * eyeZ);
            else
                fog = __GL_POWF(__glE, -density * eyeZ);

            // clamp the fog value to [0.0,1.0]
            if (fog > __glOne)
                fog = __glOne;

            if (bNeedModulate)
                pd->fog *= fog;
            else
                pd->fog = fog;
        }
        break;
    case GL_EXP2:
        PERF_CHECK(FALSE, "Uses GL_EXP2 fog\n");
        density2neg = gc->state.fog.density2neg;
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            __GLfloat eyeZ;

            pd->flags |= POLYDATA_FOG_VALID;
            eyeZ = pd->eye.z;
            fog = __GL_POWF(__glE, density2neg * eyeZ * eyeZ);

            // clamp the fog value to [0.0,1.0]
            if (fog > __glOne)
                fog = __glOne;

            if (bNeedModulate)
                pd->fog *= fog;
            else
                pd->fog = fog;
        }
        break;
    case GL_LINEAR:
        end = gc->state.fog.end;
        oneOverEMinusS = gc->state.fog.oneOverEMinusS;
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            __GLfloat eyeZ;

            pd->flags |= POLYDATA_FOG_VALID;
            eyeZ = pd->eye.z;
            if (__GL_FLOAT_LTZ(eyeZ))
                fog = (end + eyeZ) * oneOverEMinusS;
            else
                fog = (end - eyeZ) * oneOverEMinusS;

            // clamp the fog value here
            if (__GL_FLOAT_LTZ(pd->fog))
                fog = __glZero;
            else if (__GL_FLOAT_COMPARE_PONE(pd->fog, >))
                fog = __glOne;

            if (bNeedModulate)
                pd->fog *= fog;
            else
                pd->fog = fog;
        }
        break;
    }
}

#else //GL_WIN_specular_fog

void FASTCALL PolyArrayComputeFog(__GLcontext *gc, POLYARRAY *pa)
{
    __GLfloat density, density2neg, end, oneOverEMinusS;
    POLYDATA  *pd, *pdLast;

    ASSERTOPENGL(pa->flags & POLYARRAY_EYE_PROCESSED, "need eye\n");

    pdLast = pa->pdNextVertex-1;
    switch (gc->state.fog.mode)
    {
    case GL_EXP:
        PERF_CHECK(FALSE, "Uses GL_EXP fog\n");
        density = gc->state.fog.density;
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            __GLfloat eyeZ;

            pd->flags |= POLYDATA_FOG_VALID;    // used by clipping code!
            eyeZ = pd->eye.z;
            if (__GL_FLOAT_LTZ(eyeZ))
                pd->fog = __GL_POWF(__glE,  density * eyeZ);
            else
                pd->fog = __GL_POWF(__glE, -density * eyeZ);

            // clamp the fog value to [0.0,1.0]
            if (pd->fog > __glOne)
                pd->fog = __glOne;
        }
        break;
    case GL_EXP2:
        PERF_CHECK(FALSE, "Uses GL_EXP2 fog\n");
        density2neg = gc->state.fog.density2neg;
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            __GLfloat eyeZ;

            pd->flags |= POLYDATA_FOG_VALID;
            eyeZ = pd->eye.z;
            pd->fog = __GL_POWF(__glE, density2neg * eyeZ * eyeZ);

            // clamp the fog value to [0.0,1.0]
            if (pd->fog > __glOne)
                pd->fog = __glOne;
        }
        break;
    case GL_LINEAR:
        end = gc->state.fog.end;
        oneOverEMinusS = gc->state.fog.oneOverEMinusS;
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            __GLfloat eyeZ;

            pd->flags |= POLYDATA_FOG_VALID;
            eyeZ = pd->eye.z;
            if (__GL_FLOAT_LTZ(eyeZ))
                pd->fog = (end + eyeZ) * oneOverEMinusS;
            else
                pd->fog = (end - eyeZ) * oneOverEMinusS;

            // clamp the fog value here
            if (__GL_FLOAT_LTZ(pd->fog))
                pd->fog = __glZero;
            else if (__GL_FLOAT_COMPARE_PONE(pd->fog, >))
                pd->fog = __glOne;
        }
        break;
    }
}
#endif //GL_WIN_specular_fog

// Apply cheap fog to RGB colors.
//
// IN:  fog, color (front/back)
// OUT: color (front/back)

void FASTCALL PolyArrayCheapFogRGBColor(__GLcontext *gc, POLYARRAY *pa)
{
    __GLfloat fogColorR, fogColorG, fogColorB;
    POLYDATA  *pd, *pdLast;
    GLboolean bGrayFog;
    GLboolean doFrontColor, doBackColor;

    if (!(gc->state.enables.general & __GL_LIGHTING_ENABLE))
    {
        ASSERTOPENGL(!(gc->vertex.paNeeds & PANEEDS_BACK_COLOR),
                     "no back color needed when lighting is disabled\n");
    }

    // ASSERT_PRIMITIVE
    if ((unsigned int) pa->primType <= GL_LINE_STRIP)
    {
        doFrontColor = GL_TRUE;
        doBackColor  = GL_FALSE;
    }
    else
    {
        doFrontColor = gc->vertex.paNeeds & PANEEDS_FRONT_COLOR;
        doBackColor  = gc->vertex.paNeeds & PANEEDS_BACK_COLOR;
    }

    pdLast = pa->pdNextVertex-1;
    fogColorR = gc->state.fog.color.r;
    fogColorG = gc->state.fog.color.g;
    fogColorB = gc->state.fog.color.b;
    bGrayFog  = (gc->state.fog.flags & __GL_FOG_GRAY_RGB) ? GL_TRUE : GL_FALSE;

    PERF_CHECK(bGrayFog, "Uses non gray fog color\n");

    if (bGrayFog)
    {
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            __GLfloat fog, oneMinusFog, delta;

            /* Get the vertex fog value */
            fog = pd->fog;
            oneMinusFog = __glOne - fog;
            delta = oneMinusFog * fogColorR;

            /* Now whack the color */
            if (doFrontColor)
            {
                pd->colors[0].r = fog * pd->colors[0].r + delta;
                pd->colors[0].g = fog * pd->colors[0].g + delta;
                pd->colors[0].b = fog * pd->colors[0].b + delta;
            }
            if (doBackColor)
            {
                pd->colors[1].r = fog * pd->colors[1].r + delta;
                pd->colors[1].g = fog * pd->colors[1].g + delta;
                pd->colors[1].b = fog * pd->colors[1].b + delta;
            }
        }
    }
    else
    {
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            __GLfloat fog, oneMinusFog;

            /* Get the vertex fog value */
            fog = pd->fog;
            oneMinusFog = __glOne - fog;

            /* Now whack the color */
            if (doFrontColor)
            {
                pd->colors[0].r = fog * pd->colors[0].r + oneMinusFog * fogColorR;
                pd->colors[0].g = fog * pd->colors[0].g + oneMinusFog * fogColorG;
                pd->colors[0].b = fog * pd->colors[0].b + oneMinusFog * fogColorB;
            }
            if (doBackColor)
            {
                pd->colors[1].r = fog * pd->colors[1].r + oneMinusFog * fogColorR;
                pd->colors[1].g = fog * pd->colors[1].g + oneMinusFog * fogColorG;
                pd->colors[1].b = fog * pd->colors[1].b + oneMinusFog * fogColorB;
            }
        }
    }
}


// Apply cheap fog to color index values.
//
// IN:  fog, color.r (front/back)
// OUT: color.r (front/back)

void FASTCALL PolyArrayCheapFogCIColor(__GLcontext *gc, POLYARRAY *pa)
{
    __GLfloat maxR, fogIndex;
    POLYDATA  *pd, *pdLast;
    GLboolean doFrontColor, doBackColor;

    if (!(gc->state.enables.general & __GL_LIGHTING_ENABLE))
    {
        ASSERTOPENGL(!(gc->vertex.paNeeds & PANEEDS_BACK_COLOR),
                     "no back color needed when lighting is disabled\n");
    }

    // ASSERT_PRIMITIVE
    if ((unsigned int) pa->primType <= GL_LINE_STRIP)
    {
        doFrontColor = GL_TRUE;
        doBackColor  = GL_FALSE;
    }
    else
    {
        doFrontColor = gc->vertex.paNeeds & PANEEDS_FRONT_COLOR;
        doBackColor  = gc->vertex.paNeeds & PANEEDS_BACK_COLOR;
    }

    fogIndex = gc->state.fog.index;
    maxR = (1 << gc->modes.indexBits) - 1;

    pdLast = pa->pdNextVertex-1;
    for (pd = pa->pd0; pd <= pdLast; pd++)
    {
        __GLfloat fogDelta;

        fogDelta = (__glOne - pd->fog) * fogIndex;

        /* Now whack the color */
        if (doFrontColor)
        {
            pd->colors[0].r = pd->colors[0].r + fogDelta;
            if (pd->colors[0].r > maxR)
                pd->colors[0].r = maxR;
        }
        if (doBackColor)
        {
            pd->colors[1].r = pd->colors[1].r + fogDelta;
            if (pd->colors[1].r > maxR)
                pd->colors[1].r = maxR;
        }
    }
}

/****************************************************************************/


/****************************************************************************/
// Compute eye coordinates
//
// IN:  obj
// OUT: eye

void FASTCALL PolyArrayProcessEye(__GLcontext *gc, POLYARRAY *pa)
{
    __GLtransform *trMV;
    __GLmatrix    *m;
    POLYDATA      *pd, *pdLast;

    if (pa->flags & POLYARRAY_EYE_PROCESSED)
        return;

    pa->flags |= POLYARRAY_EYE_PROCESSED;

    trMV = gc->transform.modelView;
    m    = &trMV->matrix;
    pdLast = pa->pdNextVertex-1;

// The primitive may contain a mix of vertex types (2,3,4)!

    if (m->matrixType == __GL_MT_IDENTITY)
    {
        for (pd = pa->pd0; pd <= pdLast; pd++)
                pd->eye = pd->obj;
    }
    else
    {
        PFN_XFORM     pfnXform;

        // If any incoming coords contains w coord, use xf4.
        if (pa->flags & POLYARRAY_VERTEX4)
                pfnXform = m->xf4;
        else if (pa->flags & POLYARRAY_VERTEX3)
                pfnXform = m->xf3;
        else
                pfnXform = m->xf2;

        for (pd = pa->pd0; pd <= pdLast; pd++)
                (*pfnXform)(&pd->eye, (__GLfloat *) &pd->obj, m);
    }
}

/****************************************************************************/
// Process edge flags.
//
// IN:  edge
// OUT: edge (all vertices)

void FASTCALL PolyArrayProcessEdgeFlag(POLYARRAY *pa)
{
    POLYDATA  *pd, *pdLast;
    GLuint    prevEdgeFlag;

    PERF_CHECK(FALSE, "Uses edge flags!\n");

    ASSERTOPENGL(pa->pd0->flags & POLYDATA_EDGEFLAG_VALID,
        "need initial edgeflag value\n");

    pdLast = pa->pdNextVertex-1;
    for (pd = pa->pd0; pd <= pdLast; pd++)
    {
        if (pd->flags & POLYDATA_EDGEFLAG_VALID)
            prevEdgeFlag = pd->flags & (POLYDATA_EDGEFLAG_VALID | POLYDATA_EDGEFLAG_BOUNDARY);
        else
            pd->flags |= prevEdgeFlag;
    }
}

/****************************************************************************/
// transform texture coordinates
// there is no generated texture coords.
// texture coordinates are modified in place
//
// IN:  texture
// OUT: texture (all vertices are updated)

void FASTCALL PolyArrayCalcTexture(__GLcontext *gc, POLYARRAY *pa)
{
    __GLmatrix *m;
    POLYDATA  *pd, *pdLast;
    PFN_XFORM xf;

    ASSERTOPENGL(pa->pd0->flags & POLYDATA_TEXTURE_VALID,
                 "need initial texcoord value\n");

    ASSERTOPENGL(pa->flags & (POLYARRAY_TEXTURE1|POLYARRAY_TEXTURE2|
                              POLYARRAY_TEXTURE3|POLYARRAY_TEXTURE4),
                 "bad paflags\n");

    m = &gc->transform.texture->matrix;

    pdLast = pa->pdNextVertex-1;
    if (m->matrixType == __GL_MT_IDENTITY)
    {
        // Identity texture xform.
        //Incoming texcoord already has all s,t,q,r values.

        for (pd = pa->pd0; pd <= pdLast; pd++)
            if (!(pd->flags & POLYDATA_TEXTURE_VALID))
                pd->texture = (pd-1)->texture;
    }
    else
    {

        // If any incoming texture coords contains q coord, use xf4.
        if (pa->flags & POLYARRAY_TEXTURE4)
            xf = m->xf4;
        else if (pa->flags & POLYARRAY_TEXTURE3)
            xf = m->xf3;
        else if (pa->flags & POLYARRAY_TEXTURE2)
            xf = m->xf2;
        else
            xf = m->xf1;

        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            // Apply texture matrix
            if (pd->flags & POLYDATA_TEXTURE_VALID)
                (*xf)(&pd->texture, (__GLfloat *) &pd->texture, m);
            else
                pd->texture = (pd-1)->texture;
        }
    }
}

// Generate texture coordinates from object coordinates
// object linear texture generation
// s and t are enabled but r and q are disabled
// both s and t use the object linear mode
// both s and t have the SAME plane equation
// texture coordinates are modified in place
//
// IN:  texture, obj
// OUT: texture (all vertices are updated)

void FASTCALL PolyArrayCalcObjectLinearSameST(__GLcontext *gc, POLYARRAY *pa)
{
    __GLmatrix *m;
    __GLcoord *cs, gen;
    POLYDATA  *pd, *pdLast;
    PFN_XFORM xf;

    ASSERTOPENGL(pa->pd0->flags & POLYDATA_TEXTURE_VALID,
        "need initial texcoord value\n");

    ASSERTOPENGL(pa->flags & (POLYARRAY_TEXTURE1|POLYARRAY_TEXTURE2|
                              POLYARRAY_TEXTURE3|POLYARRAY_TEXTURE4),
        "bad paflags\n");

    cs = &gc->state.texture.s.objectPlaneEquation;
    pdLast = pa->pdNextVertex-1;
    m = &gc->transform.texture->matrix;

    if (m->matrixType == __GL_MT_IDENTITY)
    {
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            if (!(pd->flags & POLYDATA_TEXTURE_VALID))
            {
                pd->texture.z = (pd-1)->texture.z;
                pd->texture.w = (pd-1)->texture.w;
            }

            // both s and t have the SAME plane equation
            pd->texture.x = cs->x * pd->obj.x + cs->y * pd->obj.y +
                            cs->z * pd->obj.z + cs->w * pd->obj.w;
            pd->texture.y = pd->texture.x;
        }
    }
    else
    {
        // If any incoming texture coords contains q coord, use xf4.
        if (pa->flags & POLYARRAY_TEXTURE4)
            xf = m->xf4;
        else if (pa->flags & POLYARRAY_TEXTURE3)
            xf = m->xf3;
        else
            xf = m->xf2;        // at least 2 generated values

        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            if (pd->flags & POLYDATA_TEXTURE_VALID)
            {
                gen.z = pd->texture.z;
                gen.w = pd->texture.w;
            }

            // both s and t have the SAME plane equation
            gen.x = cs->x * pd->obj.x + cs->y * pd->obj.y +
                    cs->z * pd->obj.z + cs->w * pd->obj.w;
            gen.y = gen.x;

            // Finally, apply texture matrix
            (*xf)(&pd->texture, (__GLfloat *) &gen, m);
        }
    }
}

// Generate texture coordinates from object coordinates
// object linear texture generation
// s and t are enabled but r and q are disabled
// both s and t use the object linear mode
// both s and t have DIFFERENT plane equations
// texture coordinates are modified in place
//
// IN:  texture, obj
// OUT: texture (all vertices are updated)

void FASTCALL PolyArrayCalcObjectLinear(__GLcontext *gc, POLYARRAY *pa)
{
    __GLmatrix *m;
    __GLcoord *cs, *ct, gen;
    POLYDATA  *pd, *pdLast;
    PFN_XFORM xf;

    ASSERTOPENGL(pa->pd0->flags & POLYDATA_TEXTURE_VALID,
        "need initial texcoord value\n");

    ASSERTOPENGL(pa->flags & (POLYARRAY_TEXTURE1|POLYARRAY_TEXTURE2|
                              POLYARRAY_TEXTURE3|POLYARRAY_TEXTURE4),
        "bad paflags\n");

    cs = &gc->state.texture.s.objectPlaneEquation;
    ct = &gc->state.texture.t.objectPlaneEquation;
    pdLast = pa->pdNextVertex-1;
    m = &gc->transform.texture->matrix;

    if (m->matrixType == __GL_MT_IDENTITY)
    {
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
                if (!(pd->flags & POLYDATA_TEXTURE_VALID))
                {
                pd->texture.z = (pd-1)->texture.z;
                pd->texture.w = (pd-1)->texture.w;
                }

                pd->texture.x = cs->x * pd->obj.x + cs->y * pd->obj.y +
                                cs->z * pd->obj.z + cs->w * pd->obj.w;
                pd->texture.y = ct->x * pd->obj.x + ct->y * pd->obj.y +
                                ct->z * pd->obj.z + ct->w * pd->obj.w;
        }
    }
    else
    {
        // If any incoming texture coords contains q coord, use xf4.
        if (pa->flags & POLYARRAY_TEXTURE4)
                xf = m->xf4;
        else if (pa->flags & POLYARRAY_TEXTURE3)
                xf = m->xf3;
        else
                xf = m->xf2;    // at least 2 generated values

        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
                if (pd->flags & POLYDATA_TEXTURE_VALID)
                {
                    gen.z = pd->texture.z;
                    gen.w = pd->texture.w;
                }

                gen.x = cs->x * pd->obj.x + cs->y * pd->obj.y +
                        cs->z * pd->obj.z + cs->w * pd->obj.w;
                gen.y = ct->x * pd->obj.x + ct->y * pd->obj.y +
                        ct->z * pd->obj.z + ct->w * pd->obj.w;

                // Finally, apply texture matrix
                (*xf)(&pd->texture, (__GLfloat *) &gen, m);
        }
    }
}

// Generate texture coordinates from eye coordinates
// eye linear texture generation
// s and t are enabled but r and q are disabled
// both s and t use the eye linear mode
// both s and t have SAME plane equations
// texture coordinates are modified in place
// we may be able to get away without computing eye coord!
//
// IN:  texture; obj or eye
// OUT: texture and eye (all vertices are updated)

void FASTCALL PolyArrayCalcEyeLinearSameST(__GLcontext *gc, POLYARRAY *pa)
{
    __GLmatrix *m;
    __GLcoord *cs, gen;
    POLYDATA  *pd, *pdLast;
    PFN_XFORM xf;

    ASSERTOPENGL(pa->pd0->flags & POLYDATA_TEXTURE_VALID,
        "need initial texcoord value\n");

    ASSERTOPENGL(pa->flags & (POLYARRAY_TEXTURE1|POLYARRAY_TEXTURE2|
                              POLYARRAY_TEXTURE3|POLYARRAY_TEXTURE4),
        "bad paflags\n");

// Compute eye coord first

    if (!(pa->flags & POLYARRAY_EYE_PROCESSED))
        PolyArrayProcessEye(gc, pa);

    cs = &gc->state.texture.s.eyePlaneEquation;
    pdLast = pa->pdNextVertex-1;
    m = &gc->transform.texture->matrix;

    if (m->matrixType == __GL_MT_IDENTITY)
    {
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            if (!(pd->flags & POLYDATA_TEXTURE_VALID))
            {
                pd->texture.z = (pd-1)->texture.z;
                pd->texture.w = (pd-1)->texture.w;
            }

            // both s and t have the SAME plane equation
            pd->texture.x = cs->x * pd->eye.x + cs->y * pd->eye.y +
                            cs->z * pd->eye.z + cs->w * pd->eye.w;
            pd->texture.y = pd->texture.x;
        }
    }
    else
    {
        // If any incoming texture coords contains q coord, use xf4.
        if (pa->flags & POLYARRAY_TEXTURE4)
            xf = m->xf4;
        else if (pa->flags & POLYARRAY_TEXTURE3)
            xf = m->xf3;
        else
            xf = m->xf2;        // at least 2 generated values

        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            if (pd->flags & POLYDATA_TEXTURE_VALID)
            {
                gen.z = pd->texture.z;
                gen.w = pd->texture.w;
            }

            // both s and t have the SAME plane equation
            gen.x = cs->x * pd->eye.x + cs->y * pd->eye.y +
                    cs->z * pd->eye.z + cs->w * pd->eye.w;
            gen.y = gen.x;

            // Finally, apply texture matrix
            (*xf)(&pd->texture, (__GLfloat *) &gen, m);
        }
    }
}

// Generate texture coordinates from eye coordinates
// eye linear texture generation
// s and t are enabled but r and q are disabled
// both s and t use the eye linear mode
// both s and t have SAME plane equations
// texture coordinates are modified in place
// we may be able to get away without computing eye coord!
//
// IN:  texture; obj or eye
// OUT: texture and eye (all vertices are updated)

void FASTCALL PolyArrayCalcEyeLinear(__GLcontext *gc, POLYARRAY *pa)
{
    __GLmatrix *m;
    __GLcoord *cs, *ct, gen;
    POLYDATA  *pd, *pdLast;
    PFN_XFORM xf;

    ASSERTOPENGL(pa->pd0->flags & POLYDATA_TEXTURE_VALID,
        "need initial texcoord value\n");

    ASSERTOPENGL(pa->flags & (POLYARRAY_TEXTURE1|POLYARRAY_TEXTURE2|
                              POLYARRAY_TEXTURE3|POLYARRAY_TEXTURE4),
        "bad paflags\n");

// Compute eye coord first

    if (!(pa->flags & POLYARRAY_EYE_PROCESSED))
        PolyArrayProcessEye(gc, pa);

    cs = &gc->state.texture.s.eyePlaneEquation;
    ct = &gc->state.texture.t.eyePlaneEquation;
    pdLast = pa->pdNextVertex-1;
    m = &gc->transform.texture->matrix;

    if (m->matrixType == __GL_MT_IDENTITY)
    {
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
                if (!(pd->flags & POLYDATA_TEXTURE_VALID))
                {
                pd->texture.z = (pd-1)->texture.z;
                pd->texture.w = (pd-1)->texture.w;
                }

                pd->texture.x = cs->x * pd->eye.x + cs->y * pd->eye.y +
                                cs->z * pd->eye.z + cs->w * pd->eye.w;
                pd->texture.y = ct->x * pd->eye.x + ct->y * pd->eye.y +
                                ct->z * pd->eye.z + ct->w * pd->eye.w;
        }
    }
    else
    {
        // If any incoming texture coords contains q coord, use xf4.
        if (pa->flags & POLYARRAY_TEXTURE4)
                xf = m->xf4;
        else if (pa->flags & POLYARRAY_TEXTURE3)
                xf = m->xf3;
        else
                xf = m->xf2;    // at least 2 generated values

        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
                if (pd->flags & POLYDATA_TEXTURE_VALID)
                {
                gen.z = pd->texture.z;
                gen.w = pd->texture.w;
                }

                gen.x = cs->x * pd->eye.x + cs->y * pd->eye.y +
                        cs->z * pd->eye.z + cs->w * pd->eye.w;
                gen.y = ct->x * pd->eye.x + ct->y * pd->eye.y +
                        ct->z * pd->eye.z + ct->w * pd->eye.w;

                // Finally, apply texture matrix
                (*xf)(&pd->texture, (__GLfloat *) &gen, m);
        }
    }
}

// Compute the s & t coordinates for a sphere map.  The s & t values
// are stored in "result" even if both coordinates are not being
// generated.  The caller picks the right values out.
//
// IN:  eye, normal

void FASTCALL PASphereGen(POLYDATA *pd, __GLcoord *result)
{
    __GLcoord u, r;
    __GLfloat m, ndotu;

    // Get unit vector from origin to the vertex in eye coordinates into u
    __glNormalize(&u.x, &pd->eye.x);

    // Dot the normal with the unit position u
    ndotu = pd->normal.x * u.x + pd->normal.y * u.y + pd->normal.z * u.z;

    // Compute r
    r.x = u.x - 2 * pd->normal.x * ndotu;
    r.y = u.y - 2 * pd->normal.y * ndotu;
    r.z = u.z - 2 * pd->normal.z * ndotu;

    // Compute m
    m = 2 * __GL_SQRTF(r.x*r.x + r.y*r.y + (r.z + 1) * (r.z + 1));

    if (m)
    {
        result->x = r.x / m + __glHalf;
        result->y = r.y / m + __glHalf;
    }
    else
    {
        result->x = __glHalf;
        result->y = __glHalf;
    }
}

// Generate texture coordinates for sphere map
// sphere map texture generation
// s and t are enabled but r and q are disabled
// both s and t use the sphere map mode
// texture coordinates are modified in place
// we may be able to get away without computing eye coord!
//
// IN:  texture; obj or eye; normal
// OUT: texture and eye (all vertices are updated)

void FASTCALL PolyArrayCalcSphereMap(__GLcontext *gc, POLYARRAY *pa)
{
    __GLmatrix *m;
    __GLcoord gen;
    POLYDATA  *pd, *pdLast, *pdNormal;
    PFN_XFORM xf;
    GLboolean bIdentity;

    // this is really okay
    PERF_CHECK(FALSE, "Uses sphere map texture generation!\n");

    ASSERTOPENGL(pa->pd0->flags & POLYDATA_TEXTURE_VALID,
        "need initial texcoord value\n");

    ASSERTOPENGL(pa->pd0->flags & POLYDATA_NORMAL_VALID,
        "need initial normal\n");

    ASSERTOPENGL(pa->flags & (POLYARRAY_TEXTURE1|POLYARRAY_TEXTURE2|
                              POLYARRAY_TEXTURE3|POLYARRAY_TEXTURE4),
        "bad paflags\n");

// Compute eye coord first

    if (!(pa->flags & POLYARRAY_EYE_PROCESSED))
        PolyArrayProcessEye(gc, pa);

    m = &gc->transform.texture->matrix;
    bIdentity = (m->matrixType == __GL_MT_IDENTITY);

    // If any incoming texture coords contains q coord, use xf4.
    if (pa->flags & POLYARRAY_TEXTURE4)
        xf = m->xf4;
    else if (pa->flags & POLYARRAY_TEXTURE3)
        xf = m->xf3;
    else
        xf = m->xf2;    // at least 2 generated values

    pdLast = pa->pdNextVertex-1;
    for (pd = pa->pd0; pd <= pdLast; pd++)
    {
        if (pd->flags & POLYDATA_TEXTURE_VALID)
        {
                gen.z = pd->texture.z;
                gen.w = pd->texture.w;
        }

        if (pd->flags & POLYDATA_NORMAL_VALID)
        {
            // track current normal
            pdNormal = pd;
        }
        else
        {
            // pd->flags |= POLYDATA_NORMAL_VALID;
            pd->normal.x = pdNormal->normal.x;
            pd->normal.y = pdNormal->normal.y;
            pd->normal.z = pdNormal->normal.z;
        }

        PASphereGen(pd, &gen);  // compute s, t values

        // Finally, apply texture matrix
        if (!bIdentity)
            (*xf)(&pd->texture, (__GLfloat *) &gen, m);
        else
            pd->texture = gen;
    }
}

// Transform or compute the texture coordinates for the polyarray
// It handles all texture generation modes.  Texture coordinates are
// generated (if necessary) and transformed.
// Note that texture coordinates are modified in place.
//
// IN:  texture (always)
//      obj in GL_OBJECT_LINEAR mode
//      obj or eye in GL_EYE_LINEAR mode
//      obj or eye; normal in GL_SPHERE_MAP mode
// OUT: texture (all vertices are updated)
//      eye in GL_EYE_LINEAR and GL_SPHERE_MAP modes (all vertices
//      are updated)
void FASTCALL PolyArrayCalcMixedTexture(__GLcontext *gc, POLYARRAY *pa)
{
    __GLmatrix *m;
    GLuint     enables;
    POLYDATA   *pd, *pdLast, *pdNormal;
    PFN_XFORM  xf;
    BOOL       needNormal, didSphereGen;
    __GLcoord  savedTexture, sphereCoord, *c;
    GLboolean  bIdentity;

    enables = gc->state.enables.general;

    PERF_CHECK
    (
        !(enables & (__GL_TEXTURE_GEN_R_ENABLE | __GL_TEXTURE_GEN_Q_ENABLE)),
        "Uses r, q texture generation!\n"
    );

    if ((enables & __GL_TEXTURE_GEN_S_ENABLE)
     && (enables & __GL_TEXTURE_GEN_T_ENABLE)
     && (gc->state.texture.s.mode != gc->state.texture.t.mode))
    {
        PERF_CHECK(FALSE, "Uses different s and t tex gen modes!\n");
    }

    ASSERTOPENGL(pa->pd0->flags & POLYDATA_TEXTURE_VALID,
                 "need initial texcoord value\n");

    ASSERTOPENGL(pa->flags & (POLYARRAY_TEXTURE1|POLYARRAY_TEXTURE2|
                              POLYARRAY_TEXTURE3|POLYARRAY_TEXTURE4),
                 "bad paflags\n");

    if ((enables & __GL_TEXTURE_GEN_S_ENABLE) && (gc->state.texture.s.mode == GL_SPHERE_MAP)
     || (enables & __GL_TEXTURE_GEN_T_ENABLE) && (gc->state.texture.t.mode == GL_SPHERE_MAP))
    {
        ASSERTOPENGL(pa->pd0->flags & POLYDATA_NORMAL_VALID,
                     "need initial normal\n");

        needNormal = TRUE;
    }
    else
    {
            needNormal = FALSE;
    }

// Compute eye coord first

    if (!(pa->flags & POLYARRAY_EYE_PROCESSED))
    {
        if ((enables & __GL_TEXTURE_GEN_S_ENABLE)
                && (gc->state.texture.s.mode != GL_OBJECT_LINEAR)
         || (enables & __GL_TEXTURE_GEN_T_ENABLE)
                && (gc->state.texture.t.mode != GL_OBJECT_LINEAR)
         || (enables & __GL_TEXTURE_GEN_R_ENABLE)
                && (gc->state.texture.r.mode != GL_OBJECT_LINEAR)
         || (enables & __GL_TEXTURE_GEN_Q_ENABLE)
                && (gc->state.texture.q.mode != GL_OBJECT_LINEAR))
                PolyArrayProcessEye(gc, pa);
    }

    m = &gc->transform.texture->matrix;
    bIdentity = (m->matrixType == __GL_MT_IDENTITY);

    // If any incoming texture coords contains q coord, use xf4.
    if (pa->flags & POLYARRAY_TEXTURE4 || enables & __GL_TEXTURE_GEN_Q_ENABLE)
        xf = m->xf4;
    else if (pa->flags & POLYARRAY_TEXTURE3 || enables & __GL_TEXTURE_GEN_R_ENABLE)
        xf = m->xf3;
    else if (pa->flags & POLYARRAY_TEXTURE2 || enables & __GL_TEXTURE_GEN_T_ENABLE)
        xf = m->xf2;
    else
        xf = m->xf1;

    pdLast = pa->pdNextVertex-1;
    for (pd = pa->pd0; pd <= pdLast; pd++)
    {
        // texture coordinates are modified in place.
        // save the valid values to use for the invalid entries.
        if (pd->flags & POLYDATA_TEXTURE_VALID)
                savedTexture = pd->texture;
        else
                pd->texture = savedTexture;

        if (needNormal)
        {
                if (pd->flags & POLYDATA_NORMAL_VALID)
                {
                // track current normal
                pdNormal = pd;
                }
                else
                {
                // pd->flags |= POLYDATA_NORMAL_VALID;
                pd->normal.x = pdNormal->normal.x;
                pd->normal.y = pdNormal->normal.y;
                pd->normal.z = pdNormal->normal.z;
                }
        }

        didSphereGen = GL_FALSE;

        /* Generate s coordinate */
        if (enables & __GL_TEXTURE_GEN_S_ENABLE)
        {
                if (gc->state.texture.s.mode == GL_EYE_LINEAR)
                {
                c = &gc->state.texture.s.eyePlaneEquation;
                pd->texture.x = c->x * pd->eye.x + c->y * pd->eye.y
                        + c->z * pd->eye.z + c->w * pd->eye.w;
                }
                else if (gc->state.texture.s.mode == GL_OBJECT_LINEAR)
                {
                // the primitive may contain a mix of vertex types (2,3,4)!
                c = &gc->state.texture.s.objectPlaneEquation;
                pd->texture.x = c->x * pd->obj.x + c->y * pd->obj.y +
                                c->z * pd->obj.z + c->w * pd->obj.w;
                }
                else
                {
                ASSERTOPENGL(gc->state.texture.s.mode == GL_SPHERE_MAP,
                        "invalide texture s mode");
                PASphereGen(pd, &sphereCoord);  // compute s, t values
                pd->texture.x = sphereCoord.x;
                didSphereGen = GL_TRUE;
                }
        }

        /* Generate t coordinate */
        if (enables & __GL_TEXTURE_GEN_T_ENABLE)
        {
                if (gc->state.texture.t.mode == GL_EYE_LINEAR)
                {
                c = &gc->state.texture.t.eyePlaneEquation;
                pd->texture.y = c->x * pd->eye.x + c->y * pd->eye.y
                        + c->z * pd->eye.z + c->w * pd->eye.w;
                }
                else if (gc->state.texture.t.mode == GL_OBJECT_LINEAR)
                {
                // the primitive may contain a mix of vertex types (2,3,4)!
                c = &gc->state.texture.t.objectPlaneEquation;
                pd->texture.y = c->x * pd->obj.x + c->y * pd->obj.y +
                                c->z * pd->obj.z + c->w * pd->obj.w;
                }
                else
                {
                ASSERTOPENGL(gc->state.texture.t.mode == GL_SPHERE_MAP,
                        "invalide texture t mode");
                if (!didSphereGen)
                        PASphereGen(pd, &sphereCoord);  // compute s, t values
                pd->texture.y = sphereCoord.y;
                }
        }

        /* Generate r coordinate */
        if (enables & __GL_TEXTURE_GEN_R_ENABLE)
        {
                if (gc->state.texture.r.mode == GL_EYE_LINEAR)
                {
                c = &gc->state.texture.r.eyePlaneEquation;
                pd->texture.z = c->x * pd->eye.x + c->y * pd->eye.y
                        + c->z * pd->eye.z + c->w * pd->eye.w;
                }
                else
                {
                ASSERTOPENGL(gc->state.texture.r.mode == GL_OBJECT_LINEAR,
                        "invalide texture r mode");

                // the primitive may contain a mix of vertex types (2,3,4)!
                c = &gc->state.texture.r.objectPlaneEquation;
                pd->texture.z = c->x * pd->obj.x + c->y * pd->obj.y +
                                c->z * pd->obj.z + c->w * pd->obj.w;
                }
        }

        /* Generate q coordinate */
        if (enables & __GL_TEXTURE_GEN_Q_ENABLE)
        {
                if (gc->state.texture.q.mode == GL_EYE_LINEAR)
                {
                c = &gc->state.texture.q.eyePlaneEquation;
                pd->texture.w = c->x * pd->eye.x + c->y * pd->eye.y
                        + c->z * pd->eye.z + c->w * pd->eye.w;
                }
                else
                {
                ASSERTOPENGL(gc->state.texture.q.mode == GL_OBJECT_LINEAR,
                        "invalide texture q mode");

                // the primitive may contain a mix of vertex types (2,3,4)!
                c = &gc->state.texture.q.objectPlaneEquation;
                pd->texture.w = c->x * pd->obj.x + c->y * pd->obj.y +
                                c->z * pd->obj.z + c->w * pd->obj.w;
                }
        }

        /* Finally, apply texture matrix */
        if (!bIdentity)
                (*xf)(&pd->texture, (__GLfloat *) &pd->texture, m);
    }
}

/****************************************************************************/
// Cache whatever values are possible for the current material and lights.
// This will let us avoid doing these computations for each primitive.
void FASTCALL PolyArrayCalcLightCache(__GLcontext *gc)
{
    __GLcolor baseEmissiveAmbient;
    __GLmaterialMachine *msm;
    __GLlightSourceMachine *lsm;
    __GLlightSourcePerMaterialMachine *lspmm;
    GLuint face;

    for (face = __GL_FRONTFACE; face <= __GL_BACKFACE; face++) {

        if (face == __GL_FRONTFACE) {
            if (!(gc->vertex.paNeeds & PANEEDS_FRONT_COLOR))
                continue;
            msm = &gc->light.front;
        }
        else {
            if (!(gc->vertex.paNeeds & PANEEDS_BACK_COLOR))
                return;
            msm = &gc->light.back;
        }

        msm->cachedEmissiveAmbient.r = msm->paSceneColor.r;
        msm->cachedEmissiveAmbient.g = msm->paSceneColor.g;
        msm->cachedEmissiveAmbient.b = msm->paSceneColor.b;

        // add invarient per-light per-material cached ambient
        for (lsm = gc->light.sources; lsm; lsm = lsm->next)
        {
            lspmm = &lsm->front + face;
            msm->cachedEmissiveAmbient.r += lspmm->ambient.r;
            msm->cachedEmissiveAmbient.g += lspmm->ambient.g;
            msm->cachedEmissiveAmbient.b += lspmm->ambient.b;
        }

        __GL_CLAMP_RGB(msm->cachedNonLit.r,
                       msm->cachedNonLit.g,
                       msm->cachedNonLit.b,
                       gc,
                       msm->cachedEmissiveAmbient.r,
                       msm->cachedEmissiveAmbient.g,
                       msm->cachedEmissiveAmbient.b);
    }
}

/****************************************************************************/
// Apply the accumulated material changes to a vertex
void FASTCALL PAApplyMaterial(__GLcontext *gc, __GLmatChange *mat, GLint face)
{
    __GLmaterialState *ms;
    GLuint changeBits;

    PERF_CHECK(FALSE, "Primitives contain glMaterial calls!\n");

    // Don't modify color materials if they are in effect!

    if (face == __GL_FRONTFACE)
    {
        ms  = &gc->state.light.front;
        changeBits = mat->dirtyBits & ~gc->light.front.colorMaterialChange;
    }
    else
    {
        ms  = &gc->state.light.back;
        changeBits = mat->dirtyBits & ~gc->light.back.colorMaterialChange;
    }

    if (changeBits & __GL_MATERIAL_AMBIENT)
        ms->ambient = mat->ambient;

    if (changeBits & __GL_MATERIAL_DIFFUSE)
        ms->diffuse = mat->diffuse;

    if (changeBits & __GL_MATERIAL_SPECULAR)
        ms->specular = mat->specular;

    if (changeBits & __GL_MATERIAL_EMISSIVE)
    {
        ms->emissive.r = mat->emissive.r * gc->redVertexScale;
        ms->emissive.g = mat->emissive.g * gc->greenVertexScale;
        ms->emissive.b = mat->emissive.b * gc->blueVertexScale;
        ms->emissive.a = mat->emissive.a * gc->alphaVertexScale;
    }

    if (changeBits & __GL_MATERIAL_SHININESS)
        ms->specularExponent = mat->shininess;

    if (changeBits & __GL_MATERIAL_COLORINDEXES)
    {
        ms->cmapa = mat->cmapa;
        ms->cmapd = mat->cmapd;
        ms->cmaps = mat->cmaps;
    }

    // Re-calculate the precomputed values.  This works for RGBA and CI modes.

    if (face == __GL_FRONTFACE)
        __glValidateMaterial(gc, (GLint) changeBits, 0);
    else
        __glValidateMaterial(gc, 0, (GLint) changeBits);

// Recompute cached RGB material values:

    PolyArrayCalcLightCache(gc);
}

void FASTCALL PolyArrayApplyMaterials(__GLcontext *gc, POLYARRAY *pa)
{
    __GLmatChange matChange, *pdMat;
    GLuint        matMask;
    POLYDATA      *pd, *pdN;
    GLint         face;
    POLYMATERIAL  *pm;

    pm = GLTEB_CLTPOLYMATERIAL();

    // Need to apply material changes defined after the last vertex!

    pdN = pa->pdNextVertex;

    // ASSERT_FACE
    for (face = __GL_BACKFACE, matMask = POLYARRAY_MATERIAL_BACK;
         face >= 0;
         face--,   matMask = POLYARRAY_MATERIAL_FRONT
        )
    {
        if (!(pa->flags & matMask))
            continue;

        // Accumulate all changes into one material change record
        // We need to process (n + 1) vertices for material changes!

        matChange.dirtyBits = 0;
        for (pd = pa->pd0; pd <= pdN; pd++)
        {
            // ASSERT_MATERIAL
            if (pd->flags & matMask)
            {
                GLuint dirtyBits;

                pdMat = *(&pm->pdMaterial0[pd - pa->pdBuffer0].front + face);
                dirtyBits  = pdMat->dirtyBits;
                matChange.dirtyBits |= dirtyBits;

                if (dirtyBits & __GL_MATERIAL_AMBIENT)
                    matChange.ambient = pdMat->ambient;

                if (dirtyBits & __GL_MATERIAL_DIFFUSE)
                    matChange.diffuse = pdMat->diffuse;

                if (dirtyBits & __GL_MATERIAL_SPECULAR)
                    matChange.specular = pdMat->specular;

                if (dirtyBits & __GL_MATERIAL_EMISSIVE)
                    matChange.emissive = pdMat->emissive;

                if (dirtyBits & __GL_MATERIAL_SHININESS)
                    matChange.shininess = pdMat->shininess;

                if (dirtyBits & __GL_MATERIAL_COLORINDEXES)
                {
                    matChange.cmapa = pdMat->cmapa;
                    matChange.cmapd = pdMat->cmapd;
                    matChange.cmaps = pdMat->cmaps;
                }
            }
        }

        // apply material changes for this face
        PAApplyMaterial(gc, &matChange, face);
    }
}

/****************************************************************************/
#ifndef __GL_ASM_POLYARRAYFILLINDEX0
// Fill the index values with 0
//
// IN:  none
// OUT: colors[face].r (all vertices are updated)

void FASTCALL PolyArrayFillIndex0(__GLcontext *gc, POLYARRAY *pa, GLint face)
{
    POLYDATA  *pd, *pdLast;

    ASSERTOPENGL((GLuint) face <= 1, "bad face value\n");

    pdLast = pa->pdNextVertex-1;
    for (pd = pa->pd0; pd <= pdLast; pd++)
    {
        pd->colors[face].r = __glZero;
    }
}
#endif // __GL_ASM_POLYARRAYFILLINDEX0

#ifndef __GL_ASM_POLYARRAYFILLCOLOR0
// Fill the color values with 0,0,0,0
//
// IN:  none
// OUT: colors[face] (all vertices are updated)

void FASTCALL PolyArrayFillColor0(__GLcontext *gc, POLYARRAY *pa, GLint face)
{
    POLYDATA  *pd, *pdLast;

    ASSERTOPENGL((GLuint) face <= 1, "bad face value\n");

    pdLast = pa->pdNextVertex-1;
    for (pd = pa->pd0; pd <= pdLast; pd++)
    {
        pd->colors[face].r = __glZero;
        pd->colors[face].g = __glZero;
        pd->colors[face].b = __glZero;
        pd->colors[face].a = __glZero;
    }
}
#endif // __GL_ASM_POLYARRAYFILLCOLOR0

#ifndef __GL_ASM_POLYARRAYPROPAGATESAMECOLOR
// All vertices have the same color values.
// Clamp and scale the current color using the color buffer scales.
// From here on out the colors in the vertex are in their final form.
//
// Note: The first vertex must have a valid color!
//       Back color is not needed when lighting is disabled.
//
// IN:  color (front)
// OUT: color (front) (all vertices are updated)

void FASTCALL PolyArrayPropagateSameColor(__GLcontext *gc, POLYARRAY *pa)
{
    POLYDATA  *pd, *pdLast;
    __GLfloat r, g, b, a;

    pdLast = pa->pdNextVertex-1;
    pd = pa->pd0;
    if (pd > pdLast)
        return;

    ASSERTOPENGL(pd->flags & POLYDATA_COLOR_VALID, "no initial color\n");

    if (pa->flags & POLYARRAY_CLAMP_COLOR) {
        __GL_CLAMP_RGBA(pd->colors[0].r,
                        pd->colors[0].g,
                        pd->colors[0].b,
                        pd->colors[0].a,
                        gc,
                        pd->colors[0].r,
                        pd->colors[0].g,
                        pd->colors[0].b,
                        pd->colors[0].a);
    }

    r = pd->colors[0].r;
    g = pd->colors[0].g;
    b = pd->colors[0].b;
    a = pd->colors[0].a;

    for (pd = pd + 1 ; pd <= pdLast; pd++)
    {
        pd->colors[0].r = r;
        pd->colors[0].g = g;
        pd->colors[0].b = b;
        pd->colors[0].a = a;
    }
}
#endif // __GL_ASM_POLYARRAYPROPAGATESAMECOLOR

#ifndef __GL_ASM_POLYARRAYPROPAGATESAMEINDEX
// All vertices have the same index values.
// Mask the index values befor color clipping
// SGIBUG: The sample implementation fails to do this!
//
// Note: The first vertex must have a valid color index!
//       Back color is not needed when lighting is disabled.
//
// IN:  color.r (front)
// OUT: color.r (front) (all vertices are updated)

void FASTCALL PolyArrayPropagateSameIndex(__GLcontext *gc, POLYARRAY *pa)
{
    POLYDATA  *pd, *pdLast;
    __GLfloat index;

    pdLast = pa->pdNextVertex-1;
    pd = pa->pd0;
    if (pd > pdLast)
        return;

    ASSERTOPENGL(pd->flags & POLYDATA_COLOR_VALID, "no initial color index\n");

    if (pa->flags & POLYARRAY_CLAMP_COLOR) {
        __GL_CLAMP_CI(pd->colors[0].r, gc, pd->colors[0].r);
    }

    index = pd->colors[0].r;

    for (pd = pd + 1; pd <= pdLast; pd++)
    {
        pd->colors[0].r = index;
    }
}
#endif // __GL_ASM_POLYARRAYPROPAGATESAMEINDEX

#ifndef __GL_ASM_POLYARRAYPROPAGATEINDEX

// Propagate the valid CI colors through the vertex buffer.
//
// IN:  color.r (front)
// OUT: color.r (front) (all vertices are updated)

void FASTCALL PolyArrayPropagateIndex(__GLcontext *gc, POLYARRAY *pa)
{
    POLYDATA  *pd, *pdLast;

    if (pa->flags & POLYARRAY_CLAMP_COLOR) {
        pdLast = pa->pdNextVertex-1;
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {
            if (!(pd->flags & POLYDATA_COLOR_VALID))
            {
                // If color has not changed for this vertex,
                // use the previously computed color.

                ASSERTOPENGL(pd != pa->pd0, "no initial color index\n");
                pd->colors[0].r = (pd-1)->colors[0].r;
                continue;
            }

            __GL_CLAMP_CI(pd->colors[0].r, gc, pd->colors[0].r);

        }
    } else {
        // If all incoming vertices have valid colors, we are done.
        if ((pa->flags & POLYARRAY_SAME_POLYDATA_TYPE)
            && (pa->pdCurColor != pa->pd0)
            // Need to test 2nd vertex because pdCurColor may have been
            // advanced as a result of combining Color command after End
            && ((pa->pd0 + 1)->flags & POLYDATA_COLOR_VALID))
          ;
        else
        {
            pdLast = pa->pdNextVertex-1;
            for (pd = pa->pd0; pd <= pdLast; pd++)
            {
                if (!(pd->flags & POLYDATA_COLOR_VALID))
                {
                    // If color has not changed for this vertex,
                    // use the previously computed color.

                    ASSERTOPENGL(pd != pa->pd0, "no initial color index\n");
                    pd->colors[0].r = (pd-1)->colors[0].r;
                }
            }
        }
    }
}
#endif // __GL_ASM_POLYARRAYPROPAGATEINDEX

#ifndef __GL_ASM_POLYARRAYPROPAGATECOLOR

// Propagate the valid RGBA colors through the vertex buffer.
//
// IN:  color (front)
// OUT: color (front) (all vertices are updated)

void FASTCALL PolyArrayPropagateColor(__GLcontext *gc, POLYARRAY *pa)
{
    POLYDATA  *pd, *pdLast;

    if (pa->flags & POLYARRAY_CLAMP_COLOR) {
        pdLast = pa->pdNextVertex-1;
        for (pd = pa->pd0; pd <= pdLast; pd++)
        {

            if (!(pd->flags & POLYDATA_COLOR_VALID))
            {
                // If color has not changed for this vertex,
                // use the previously computed color.

                ASSERTOPENGL(pd != pa->pd0, "no initial color\n");
                pd->colors[0] = (pd-1)->colors[0];
                continue;
            }

            __GL_CLAMP_RGBA(pd->colors[0].r,
                            pd->colors[0].g,
                            pd->colors[0].b,
                            pd->colors[0].a,
                            gc,
                            pd->colors[0].r,
                            pd->colors[0].g,
                            pd->colors[0].b,
                            pd->colors[0].a);
        }
    } else {
        // If all incoming vertices have valid colors, we are done.
        if ((pa->flags & POLYARRAY_SAME_POLYDATA_TYPE)
            && (pa->pdCurColor != pa->pd0)
            // Need to test 2nd vertex because pdCurColor may have been
            // advanced as a result of combining Color command after End
            && ((pa->pd0 + 1)->flags & POLYDATA_COLOR_VALID))
          ;
        else
        {
            pdLast = pa->pdNextVertex-1;
            for (pd = pa->pd0; pd <= pdLast; pd++)
            {
                if (!(pd->flags & POLYDATA_COLOR_VALID))
                {
                    // If color has not changed for this vertex,
                    // use the previously computed color.

                    ASSERTOPENGL(pd != pa->pd0, "no initial color\n");
                    pd->colors[0] = (pd-1)->colors[0];
                }
            }
        }
    }
}
#endif // __GL_ASM_POLYARRAYPROPAGATECOLOR

/****************************************************************************/
#if 0
//!!! remove this
// do we need clip?
// need __GL_HAS_FOG bit for line and polygon clipping!
// The boundaryEdge field is initialized in the calling routine.
#define PA_STORE_PROCESSED_POLYGON_VERTEX(v,pd,bits)                        \
        {                                                                   \
            (v)->clip = (pd)->clip;                                         \
            (v)->window = (pd)->window;                                     \
            (v)->eye.z = (pd)->eye.z; /* needed by slow fog */              \
            (v)->fog = (pd)->fog; /* needed by cheap fog in flat shading */ \
            (v)->texture.x = (pd)->texture.x;                               \
            (v)->texture.y = (pd)->texture.y;                               \
            (v)->texture.z = (pd)->texture.z; /* z is needed by feedback! */\
            (v)->texture.w = (pd)->texture.w;                               \
            (v)->color = &(pd)->color;                                      \
            (v)->clipCode = (pd)->clipCode;                                 \
            (v)->has = bits;                                                \
        }

// need eye if there is eyeClipPlanes
// need texture if there is texture
// need __GL_HAS_FOG bit for line and polygon clipping!
#define PA_STORE_PROCESSED_LINE_VERTEX(v,pd,bits)                           \
        {                                                                   \
            (v)->clip = (pd)->clip;                                         \
            (v)->window = (pd)->window;                                     \
            (v)->eye.z = (pd)->eye.z; /* needed by slow fog */              \
            (v)->fog = (pd)->fog; /* needed by cheap fog in flat shading */ \
            (v)->texture.x = (pd)->texture.x;                               \
            (v)->texture.y = (pd)->texture.y;                               \
            (v)->texture.z = (pd)->texture.z; /* z is needed by feedback! */\
            (v)->texture.w = (pd)->texture.w;                               \
            (v)->colors[__GL_FRONTFACE] = (pd)->color;                      \
            (v)->clipCode = (pd)->clipCode;                                 \
            (v)->has = bits;                                                \
        }

// need eye if antialised is on
// need texture if there is texture
#define PA_STORE_PROCESSED_POINT_VERTEX(v,pd,bits)                          \
        {                                                                   \
            (v)->window = (pd)->window;                                     \
            (v)->eye.z = (pd)->eye.z; /* needed by slow fog */              \
            (v)->fog = (pd)->fog; /* needed by cheap fog in flat shading */ \
            (v)->clip.w = (pd)->clip.w; /* needed by feedback! */           \
            (v)->texture.x = (pd)->texture.x;                               \
            (v)->texture.y = (pd)->texture.y;                               \
            (v)->texture.z = (pd)->texture.z; /* z is needed by feedback! */\
            (v)->texture.w = (pd)->texture.w;                               \
            (v)->color = &(pd)->color;                                      \
            (v)->has = bits;                                                \
        }
#endif // 0

// ---------------------------------------------------------
// The primitive is clipped.
void FASTCALL PARenderPoint(__GLcontext *gc, __GLvertex *v)
{
    if (v->clipCode == 0)
        (*gc->procs.renderPoint)(gc, v);
}

// ---------------------------------------------------------
// The primitive is clipped.
void FASTCALL PARenderLine(__GLcontext *gc, __GLvertex *v0,
                           __GLvertex *v1, GLuint flags)
{
    if (v0->clipCode | v1->clipCode)
    {
        /*
         * The line must be clipped more carefully.  Cannot
         * trivially accept the lines.
         *
         * If anding the codes is non-zero then every vertex
         * in the line is outside of the same set of clipping
         * planes (at least one).  Trivially reject the line.
         */
        if ((v0->clipCode & v1->clipCode) == 0)
            __glClipLine(gc, v0, v1, flags);
    }
    else
    {
        // Line is trivially accepted so render it
        (*gc->procs.renderLine)(gc, v0, v1, flags);
    }
}
// ---------------------------------------------------------
// The primitive is clipped.
void FASTCALL PARenderTriangle(__GLcontext *gc, __GLvertex *v0, __GLvertex *v1, __GLvertex *v2)
{
    GLuint orCodes;

    /* Clip check */
    orCodes = v0->clipCode | v1->clipCode | v2->clipCode;
    if (orCodes)
    {
        /* Some kind of clipping is needed.
         *
         * If anding the codes is non-zero then every vertex
         * in the triangle is outside of the same set of
         * clipping planes (at least one).  Trivially reject
         * the triangle.
         */
        if (!(v0->clipCode & v1->clipCode & v2->clipCode))
            (*gc->procs.clipTriangle)(gc, v0, v1, v2, orCodes);
    }
    else
    {
        (*gc->procs.renderTriangle)(gc, v0, v1, v2);
    }
}

// ---------------------------------------------------------
// The primitive is not clipped.
void PARenderQuadFast(__GLcontext *gc, __GLvertex *v0, __GLvertex *v1, __GLvertex *v2, __GLvertex *v3)
{
    // Vertex ordering is important.  Line stippling uses it.
    // SGIBUG: The sample implementation does it wrong.

    GLuint savedTag;

    /* Render the quad as two triangles */
    savedTag = v2->has & __GL_HAS_EDGEFLAG_BOUNDARY;
    v2->has &= ~__GL_HAS_EDGEFLAG_BOUNDARY;
    (*gc->procs.renderTriangle)(gc, v0, v1, v2);
    v2->has |= savedTag;
    savedTag = v0->has & __GL_HAS_EDGEFLAG_BOUNDARY;
    v0->has &= ~__GL_HAS_EDGEFLAG_BOUNDARY;
    (*gc->procs.renderTriangle)(gc, v2, v3, v0);
    v0->has |= savedTag;
}

// ---------------------------------------------------------
// The primitive is clipped.
void PARenderQuadSlow(__GLcontext *gc, __GLvertex *v0, __GLvertex *v1, __GLvertex *v2, __GLvertex *v3)
{
    GLuint orCodes;

    orCodes = v0->clipCode | v1->clipCode | v2->clipCode | v3->clipCode;

    if (orCodes)
    {
        /* Some kind of clipping is needed.
         *
         * If anding the codes is non-zero then every vertex
         * in the quad is outside of the same set of
         * clipping planes (at least one).  Trivially reject
         * the quad.
         */
        if (!(v0->clipCode & v1->clipCode & v2->clipCode & v3->clipCode))
        {
            /* Clip the quad as a polygon */
            __GLvertex *iv[4];

            iv[0] = v0;
            iv[1] = v1;
            iv[2] = v2;
            iv[3] = v3;
            __glDoPolygonClip(gc, &iv[0], 4, orCodes);
        }
    }
    else
    {
        PARenderQuadFast(gc, v0, v1, v2, v3);
    }
}

// ---------------------------------------------------------
#ifndef NEW_PARTIAL_PRIM

void FASTCALL PolyArrayDrawPoints(__GLcontext *gc, POLYARRAY *pa)
{
// Index mapping is always identity in Points.

    ASSERTOPENGL(!pa->aIndices, "Index mapping must be identity\n");

    // Assert that pa->nIndices is correct
    ASSERTOPENGL(pa->nIndices == pa->pdNextVertex - pa->pd0,
                 "bad nIndices\n");

    // Call PolyArrayRenderPoints later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
}
#endif // NEW_PARTIAL_PRIM

void FASTCALL PolyArrayRenderPoints(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      i, nIndices;
    POLYDATA   *pd0;
    void (FASTCALL *rp)(__GLcontext *gc, __GLvertex *v);

// Index mapping is always identity in Points.

    ASSERTOPENGL(!pa->aIndices, "Index mapping must be identity\n");

    nIndices = pa->nIndices;
    pd0      = pa->pd0;
    rp = pa->orClipCodes ? PARenderPoint : gc->procs.renderPoint;

    // Identity mapping
    for (i = 0; i < nIndices; i++)
        /* Render the point */
        (*rp)(gc, (__GLvertex *) &pd0[i]);
}

// ---------------------------------------------------------
#ifndef NEW_PARTIAL_PRIM
void FASTCALL PolyArrayDrawLines(__GLcontext *gc, POLYARRAY *pa)
{
    // Assert that pa->nIndices is correct if aIndices is identity
    ASSERTOPENGL(pa->aIndices || pa->nIndices == pa->pdNextVertex - pa->pd0,
                 "bad nIndices\n");

    // Call PolyArrayRenderLines later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
}
#endif //NEW_PARTIAL_PRIM

void FASTCALL PolyArrayRenderLines(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      i, iLast2;
    GLubyte    *aIndices;
    POLYDATA   *pd0;
    PFN_RENDER_LINE rl;
    GLuint     modeFlags;

    iLast2 = pa->nIndices - 2;
    pd0    = pa->pd0;
    rl = pa->orClipCodes ? PARenderLine : gc->procs.renderLine;

    if (pa->flags & POLYARRAY_SAME_COLOR_DATA) {
        modeFlags = gc->polygon.shader.modeFlags;
        gc->polygon.shader.modeFlags &= ~__GL_SHADE_SMOOTH;
    }

    (*gc->procs.lineBegin)(gc);

    if (!(aIndices = pa->aIndices))
    {
        // Identity mapping
        for (i = 0; i <= iLast2; i += 2)
        {
            /* setup for rendering this line */
            gc->line.notResetStipple = GL_FALSE;

            (*rl)(gc, (__GLvertex *) &pd0[i  ],
                  (__GLvertex *) &pd0[i+1], __GL_LVERT_FIRST);
        }
    }
    else
    {
        for (i = 0; i <= iLast2; i += 2)
        {
            /* setup for rendering this line */
            gc->line.notResetStipple = GL_FALSE;

            (*rl)(gc, (__GLvertex *) &pd0[aIndices[i  ]],
                  (__GLvertex *) &pd0[aIndices[i+1]], __GL_LVERT_FIRST);
        }
    }

    (*gc->procs.lineEnd)(gc);

    if (pa->flags & POLYARRAY_SAME_COLOR_DATA) {
        gc->polygon.shader.modeFlags = modeFlags;
    }
}

// ---------------------------------------------------------
#ifndef NEW_PARTIAL_PRIM
void FASTCALL PolyArrayDrawLLoop(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      nIndices;
    POLYDATA   *pd, *pd0;

// Index mapping is always identity in Line Loop.

    ASSERTOPENGL(!pa->aIndices, "Index mapping must be identity\n");

// A line loop is the same as a line strip except that a final segment is
// added from the final specified vertex to the first vertex.  We will
// convert the line loop into a strip here.

    nIndices = pa->nIndices;

// If we are continuing with a previously decomposed line loop, we need to
// connect the last vertex of the previous primitive and the first vertex
// of the current primitive with a line segment.

    if (pa->flags & POLYARRAY_PARTIAL_BEGIN)
    {
        ASSERTOPENGL(!(pa->flags & POLYARRAY_RESET_STIPPLE),
                "bad stipple reset flag!\n");

        // Insert previous end vertex at the beginning and update clip code
        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[0]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
    }
    else
    {
// New line loop.

        ASSERTOPENGL(pa->flags & POLYARRAY_RESET_STIPPLE,
            "bad stipple reset flag!\n");

// At least two vertices must be given for anything to occur.
// An extra vertex was added to close the loop.

        if (nIndices < 3)
        {
                ASSERTOPENGL(!(pa->flags & POLYARRAY_PARTIAL_END),
                         "Partial end with insufficient vertices\n");
                pa->nIndices--;
                goto DrawLLoop_end;
        }
    }

    pd0 = pa->pd0;

// If the primitive is only partially complete, save the last vertex for
// next batch.

    if (pa->flags & POLYARRAY_PARTIAL_END)
    {
        pd = &pd0[nIndices-1];
        PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[0], pd);

// Save the the original first vertex for closing the loop later.

        if (!(pa->flags & POLYARRAY_PARTIAL_BEGIN))
                PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[1], pd0);

// Need not render this partial primitive if it is completely clipped.

#ifdef POLYARRAY_AND_CLIPCODES
        if (pa->andClipCodes != 0)
                goto DrawLLoop_end;
#endif
    }
    else
    {
        POLYDATA *pdOrigin;

// Insert the original first vertex to close the loop and update clip code.

        if (pa->flags & POLYARRAY_PARTIAL_BEGIN)
                pdOrigin = &gc->vertex.pdSaved[1];
        else
                pdOrigin = pd0;

        pd = pa->pdNextVertex++;
        ASSERTOPENGL(pd <= pa->pdBufferMax, "vertex overflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, pdOrigin);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
    }

    // Assert that pa->nIndices is correct
    ASSERTOPENGL(pa->nIndices == pa->pdNextVertex - pa->pd0,
        "bad nIndices\n");

// Render the line strip.

    // Call PolyArrayRenderLStrip later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
DrawLLoop_end:
    // Change primitive type to line strip!
    pa->primType = GL_LINE_STRIP;
}
#endif // NEW_PARTIAL_PRIM

void FASTCALL PolyArrayRenderLStrip(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      i, iLast;
    GLubyte    *aIndices;
    POLYDATA   *pd0;
    PFN_RENDER_LINE rl;
    GLuint     modeFlags;

// Render the line strip.

    iLast = pa->nIndices - 1;
    pd0   = pa->pd0;
    rl = pa->orClipCodes ? PARenderLine : gc->procs.renderLine;
    if (iLast <= 0)
        return;

// Reset the line stipple if this is a new strip.

    if (pa->flags & POLYARRAY_RESET_STIPPLE)
        gc->line.notResetStipple = GL_FALSE;

    if (pa->flags & POLYARRAY_SAME_COLOR_DATA) {
        modeFlags = gc->polygon.shader.modeFlags;
        gc->polygon.shader.modeFlags &= ~__GL_SHADE_SMOOTH;
    }

    (*gc->procs.lineBegin)(gc);

    if (!(aIndices = pa->aIndices))
    {
        // Identity mapping
        // Add first line segment (NOTE: 0, 1)
        (*rl)(gc, (__GLvertex *) &pd0[0],
                  (__GLvertex *) &pd0[1], __GL_LVERT_FIRST);

        // Add subsequent line segments (NOTE: i, i+1)
        for (i = 1; i < iLast; i++)
            (*rl)(gc, (__GLvertex *) &pd0[i  ],
                      (__GLvertex *) &pd0[i+1], 0);
    }
    else
    {
        // Add first line segment (NOTE: 0, 1)
        (*rl)(gc, (__GLvertex *) &pd0[aIndices[0]],
                  (__GLvertex *) &pd0[aIndices[1]], __GL_LVERT_FIRST);

        // Add subsequent line segments (NOTE: i, i+1)
        for (i = 1; i < iLast; i++)
            (*rl)(gc, (__GLvertex *) &pd0[aIndices[i  ]],
                      (__GLvertex *) &pd0[aIndices[i+1]], 0);
    }

    if (pa->flags & POLYARRAY_SAME_COLOR_DATA) {
        gc->polygon.shader.modeFlags = modeFlags;
    }

    (*gc->procs.lineEnd)(gc);
}

// ---------------------------------------------------------
#ifndef NEW_PARTIAL_PRIM
void FASTCALL PolyArrayDrawLStrip(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      nIndices;
    GLubyte    *aIndices;
    POLYDATA   *pd, *pd0;

    nIndices = pa->nIndices;
    aIndices = pa->aIndices;

// If we are continuing with a previously decomposed line strip, we need to
// connect the last vertex of the previous primitive and the first vertex
// of the current primitive with a line segment.

    if (pa->flags & POLYARRAY_PARTIAL_BEGIN)
    {
        ASSERTOPENGL(!(pa->flags & POLYARRAY_RESET_STIPPLE),
            "bad stipple reset flag!\n");

        // Insert previous end vertex at the beginning and update clip code
        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[0]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
        // Assert that aIndices[0] was initialized in Begin
        ASSERTOPENGL(!pa->aIndices || pa->aIndices[0] == 0, "bad index mapping\n");
    }
    else
    {
// New line strip.

        ASSERTOPENGL(pa->flags & POLYARRAY_RESET_STIPPLE,
            "bad stipple reset flag!\n");
    }

// At least two vertices must be given for anything to occur.

    if (nIndices < 2)
    {
        ASSERTOPENGL(!(pa->flags & POLYARRAY_PARTIAL_END),
                     "Partial end with insufficient vertices\n");
        return;
    }

// If the primitive is only partially complete, save the last vertex for
// next batch.

    if (pa->flags & POLYARRAY_PARTIAL_END)
    {
        pd0 = pa->pd0;
        pd  = aIndices ? &pd0[aIndices[nIndices-1]] : &pd0[nIndices-1];
        PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[0], pd);

// Need not render this partial primitive if it is completely clipped.

#ifdef POLYARRAY_AND_CLIPCODES
        if (pa->andClipCodes != 0)
                return;
#endif
    }

    // Assert that pa->nIndices is correct if aIndices is identity
    ASSERTOPENGL(pa->aIndices || pa->nIndices == pa->pdNextVertex - pa->pd0,
        "bad nIndices\n");

// Render the line strip.

    // Call PolyArrayRenderLStrip later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
}

// ---------------------------------------------------------
void FASTCALL PolyArrayDrawTriangles(__GLcontext *gc, POLYARRAY *pa)
{
    // Assert that pa->nIndices is correct if aIndices is identity
    ASSERTOPENGL(pa->aIndices || pa->nIndices == pa->pdNextVertex - pa->pd0,
                 "bad nIndices\n");

    // Call PolyArrayRenderTriangles later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
}
#endif // NEW_PARTIAL_PRIM

void FASTCALL PolyArrayRenderTriangles(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      i, iLast3;
    GLubyte    *aIndices, *aIndicesEnd;
    POLYDATA   *pd0;
    __GLvertex *provoking;
    PFN_RENDER_TRIANGLE rt;

// Vertex ordering is important.  Line stippling uses it.
// SGIBUG: The sample implementation does it wrong.

    iLast3 = pa->nIndices - 3;
    pd0    = pa->pd0;
    rt = pa->orClipCodes ? PARenderTriangle : gc->procs.renderTriangle;

    if (!(aIndices = pa->aIndices))
    {
        // Identity mapping
        for (i = 0; i <= iLast3; i += 3)
        {
            /* setup for rendering this triangle */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[i+2];

            /* Render the triangle (NOTE: i, i+1, i+2) */
            (*rt)(gc, (__GLvertex *) &pd0[i  ],
                  (__GLvertex *) &pd0[i+1],
            (__GLvertex *) &pd0[i+2]);
        }
    }
    else
    {
#if 0
        for (i = 0; i <= iLast3; i += 3)
        {
            /* setup for rendering this triangle */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[aIndices[i+2]];

            /* Render the triangle (NOTE: i, i+1, i+2) */
            (*rt)(gc, (__GLvertex *) &pd0[aIndices[i  ]],
                      (__GLvertex *) &pd0[aIndices[i+1]],
                      (__GLvertex *) &pd0[aIndices[i+2]]);
        }
#else
    aIndicesEnd = aIndices+iLast3;
    while (aIndices <= aIndicesEnd)
    {
            /* setup for rendering this triangle */
            gc->line.notResetStipple = GL_FALSE;
            provoking = PD_VERTEX(pd0, aIndices[2]);
            gc->vertex.provoking = provoking;

            /* Render the triangle (NOTE: i, i+1, i+2) */
            (*rt)(gc, PD_VERTEX(pd0, aIndices[0]),
                      PD_VERTEX(pd0, aIndices[1]),
                      provoking);
            aIndices += 3;
        }
#endif
    }
}

// ---------------------------------------------------------
#ifndef NEW_PARTIAL_PRIM
void FASTCALL PolyArrayDrawTStrip(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      nIndices;
    GLubyte    *aIndices;
    POLYDATA   *pd, *pd0;

    nIndices = pa->nIndices;
    aIndices = pa->aIndices;

    // If we are continuing with a previously decomposed triangle strip,
    // we need to start from the last two vertices of the previous primitive.
    //
    // Note that the flush vertex ensures that the continuing triangle strip
    // is in the default orientation so that it can fall through the normal
    // code.

    if (pa->flags & POLYARRAY_PARTIAL_BEGIN)
    {
        // Insert previous end vertices at the beginning and update clip code
        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[1]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
        // Assert that aIndices[1] was initialized in Begin
        ASSERTOPENGL(!pa->aIndices || pa->aIndices[1] == 1, "bad index mapping\n");

        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[0]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
        // Assert that aIndices[0] was initialized in Begin
        ASSERTOPENGL(!pa->aIndices || pa->aIndices[0] == 0, "bad index mapping\n");
    }

// Need at least 3 vertices.

    if (nIndices < 3)
    {
        ASSERTOPENGL(!(pa->flags & POLYARRAY_PARTIAL_END),
                     "Partial end with insufficient vertices\n");
        return;
    }

    // If the primitive is only partially complete,
    // save the last two vertices for next batch.
#ifdef GL_WIN_phong_shading
    // !!If phong shaded, also save the current material parameters.
    // No need, since in Phong shading, I am throwing away all glMaterial
    // calls between glBegin/glEnd. If it is a PARTIAL_PRIMITIVE, then
    // there were no material changes (except ColorMaterial) immediately
    // before.
#endif //GL_WIN_phong_shading
    if (pa->flags & POLYARRAY_PARTIAL_END)
    {
        pd0 = pa->pd0;
        pd  = aIndices ? &pd0[aIndices[nIndices-2]] : &pd0[nIndices-2];
        PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[0], pd);
        pd  = aIndices ? &pd0[aIndices[nIndices-1]] : &pd0[nIndices-1];
        PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[1], pd);

        // Need not render this partial primitive if it is completely clipped.

#ifdef POLYARRAY_AND_CLIPCODES
        if (pa->andClipCodes != 0)
            return;
#endif
    }

    // Assert that pa->nIndices is correct if aIndices is identity
    ASSERTOPENGL(pa->aIndices || pa->nIndices == pa->pdNextVertex - pa->pd0,
                 "bad nIndices\n");

    // Render the triangle strip.

    // Call PolyArrayRenderTStrip later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
}
#endif //NEW_PARTIAL_PRIM

void FASTCALL PolyArrayRenderTStrip(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      i, iLast3;
    GLubyte    *aIndices;
    POLYDATA   *pd0;
    PFN_RENDER_TRIANGLE rt;

    iLast3 = pa->nIndices - 3;
    pd0    = pa->pd0;
    rt = pa->orClipCodes ? PARenderTriangle : gc->procs.renderTriangle;
    if (iLast3 < 0)
        return;

    // Vertex ordering is important.  Line stippling uses it.

    if (!(aIndices = pa->aIndices))
    {
        // Identity mapping
        // Initialize first 2 vertices so we can start rendering the strip
        // below.  The edge flags are not modified by our lower level
        // routines.
        pd0[0].flags |= POLYDATA_EDGEFLAG_BOUNDARY;
        pd0[1].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

        for (i = 0; i <= iLast3; )
        {
            /* setup for rendering this triangle */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[i+2];
            pd0[i+2].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

            /* Render the triangle (NOTE: i, i+1, i+2) */
            (*rt)(gc, (__GLvertex *) &pd0[i  ],
                  (__GLvertex *) &pd0[i+1],
            (__GLvertex *) &pd0[i+2]);
            i++;

            if (i > iLast3)
              break;

            /* setup for rendering this triangle */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[i+2];
            pd0[i+2].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

            /* Render the triangle (NOTE: i+1, i, i+2) */
            (*rt)(gc, (__GLvertex *) &pd0[i+1],
                  (__GLvertex *) &pd0[i  ],
            (__GLvertex *) &pd0[i+2]);
            i++;
        }
    }
    else
    {
        // Initialize first 2 vertices so we can start rendering the strip
        // below.  The edge flags are not modified by our lower level routines.
        pd0[aIndices[0]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;
        pd0[aIndices[1]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

        for (i = 0; i <= iLast3; )
        {
            /* setup for rendering this triangle */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[aIndices[i+2]];
            pd0[aIndices[i+2]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

            /* Render the triangle (NOTE: i, i+1, i+2) */
            (*rt)(gc, (__GLvertex *) &pd0[aIndices[i  ]],
                  (__GLvertex *) &pd0[aIndices[i+1]],
            (__GLvertex *) &pd0[aIndices[i+2]]);
            i++;

            if (i > iLast3)
              break;

            /* setup for rendering this triangle */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[aIndices[i+2]];
            pd0[aIndices[i+2]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

            /* Render the triangle (NOTE: i+1, i, i+2) */
            (*rt)(gc, (__GLvertex *) &pd0[aIndices[i+1]],
                  (__GLvertex *) &pd0[aIndices[i  ]],
            (__GLvertex *) &pd0[aIndices[i+2]]);
            i++;
        }
    }
}

// ---------------------------------------------------------
#ifndef NEW_PARTIAL_PRIM
void FASTCALL PolyArrayDrawTFan(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      nIndices;
    GLubyte    *aIndices;
    POLYDATA   *pd, *pd0;

    nIndices = pa->nIndices;
    aIndices = pa->aIndices;

    // If we are continuing with a previously decomposed triangle fan,
    // we need to connect the last vertex of the previous primitive and the
    // first vertex of the current primitive with a triangle.

    if (pa->flags & POLYARRAY_PARTIAL_BEGIN)
    {
        // Insert previous end vertex at the beginning and update clip code
        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[1]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
        // Assert that aIndices[1] was initialized in Begin
        ASSERTOPENGL(!pa->aIndices || pa->aIndices[1] == 1, "bad index mapping\n");

        // Insert the origin first vertex at the beginning and update
        // clip code
        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[0]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
        // Assert that aIndices[0] was initialized in Begin
        ASSERTOPENGL(!pa->aIndices || pa->aIndices[0] == 0, "bad index mapping\n");
    }

    // Need at least 3 vertices.

    if (nIndices < 3)
    {
        ASSERTOPENGL(!(pa->flags & POLYARRAY_PARTIAL_END),
                     "Partial end with insufficient vertices\n");
        return;
    }

    // If the primitive is only partially complete, save the last vertex
    // for next batch.  Also save the original first vertex of the triangle
    // fan.

    if (pa->flags & POLYARRAY_PARTIAL_END)
    {
        pd0 = pa->pd0;
        pd  = aIndices ? &pd0[aIndices[nIndices-1]] : &pd0[nIndices-1];
        PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[1], pd);

        if (!(pa->flags & POLYARRAY_PARTIAL_BEGIN))
        {
            pd = aIndices ? &pd0[aIndices[0]] : &pd0[0];
            PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[0], pd);
        }

        // Need not render this partial primitive if it is completely clipped.

#ifdef POLYARRAY_AND_CLIPCODES
        if (pa->andClipCodes != 0)
            return;
#endif
    }

    // Assert that pa->nIndices is correct if aIndices is identity
    ASSERTOPENGL(pa->aIndices || pa->nIndices == pa->pdNextVertex - pa->pd0,
                 "bad nIndices\n");

    // Render the triangle fan.

    // Call PolyArrayRenderTFan later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
}
#endif // NEW_PARTIAL_PRIM

void FASTCALL PolyArrayRenderTFan(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      i, iLast2;
    GLubyte    *aIndices;
    POLYDATA   *pd0;
    PFN_RENDER_TRIANGLE rt;

    iLast2 = pa->nIndices - 2;
    pd0    = pa->pd0;
    rt = pa->orClipCodes ? PARenderTriangle : gc->procs.renderTriangle;
    if (iLast2 <= 0)
        return;

    // Vertex ordering is important.  Line stippling uses it.
    // SGIBUG: The sample implementation does it wrong.

    if (!(aIndices = pa->aIndices))
    {
        // Identity mapping
        // Initialize first 2 vertices so we can start rendering the tfan
        // below.  The edge flags are not modified by our lower level routines.
        pd0[0].flags |= POLYDATA_EDGEFLAG_BOUNDARY;
        pd0[1].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

        for (i = 1; i <= iLast2; i++)
        {
            /* setup for rendering this triangle */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[i+1];
            pd0[i+1].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

            /* Render the triangle (NOTE: 0, i, i+1) */
            (*rt)(gc, (__GLvertex *) &pd0[0  ],
                  (__GLvertex *) &pd0[i  ],
            (__GLvertex *) &pd0[i+1]);
        }
    }
    else
    {
        POLYDATA *pdOrigin;

        // Initialize first 2 vertices so we can start rendering the tfan
        // below.  The edge flags are not modified by our lower level
        // routines.
        pd0[aIndices[0]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;
        pd0[aIndices[1]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

        pdOrigin = &pd0[aIndices[0]];
        for (i = 1; i <= iLast2; i++)
        {
            /* setup for rendering this triangle */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[aIndices[i+1]];
            pd0[aIndices[i+1]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

            /* Render the triangle (NOTE: 0, i, i+1) */
            (*rt)(gc, (__GLvertex *) pdOrigin,
                  (__GLvertex *) &pd0[aIndices[i  ]],
                  (__GLvertex *) &pd0[aIndices[i+1]]);
        }
    }
}

// ---------------------------------------------------------
#ifndef NEW_PARTIAL_PRIM
void FASTCALL PolyArrayDrawQuads(__GLcontext *gc, POLYARRAY *pa)
{
    // Assert that pa->nIndices is correct if aIndices is identity
    ASSERTOPENGL(pa->aIndices || pa->nIndices == pa->pdNextVertex - pa->pd0,
                 "bad nIndices\n");

    // Call PolyArrayRenderQuad later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
}
#endif // NEW_PARTIAL_PRIM

void FASTCALL PolyArrayRenderQuads(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      i, iLast4;
    GLubyte    *aIndices;
    POLYDATA   *pd0;
    void (*rq)(__GLcontext *gc, __GLvertex *v0, __GLvertex *v1, __GLvertex *v2,
               __GLvertex *v3);

    // Vertex ordering is important.  Line stippling uses it.

    iLast4 = pa->nIndices - 4;
    pd0    = pa->pd0;
    rq = pa->orClipCodes ? PARenderQuadSlow : PARenderQuadFast;

    if (!(aIndices = pa->aIndices))
    {
        // Identity mapping
        for (i = 0; i <= iLast4; i += 4)
        {
            /* setup for rendering this quad */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[i+3];

            /* Render the quad (NOTE: i, i+1, i+2, i+3) */
            (*rq)(gc, (__GLvertex *) &pd0[i  ],
                  (__GLvertex *) &pd0[i+1],
            (__GLvertex *) &pd0[i+2],
                  (__GLvertex *) &pd0[i+3]);
        }
    }
    else
    {
        for (i = 0; i <= iLast4; i += 4)
        {
            /* setup for rendering this quad */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[aIndices[i+3]];

            /* Render the quad (NOTE: i, i+1, i+2, i+3) */
            (*rq)(gc, (__GLvertex *) &pd0[aIndices[i  ]],
                  (__GLvertex *) &pd0[aIndices[i+1]],
            (__GLvertex *) &pd0[aIndices[i+2]],
                  (__GLvertex *) &pd0[aIndices[i+3]]);
        }
    }
}

// ---------------------------------------------------------
#ifndef NEW_PARTIAL_PRIM
void FASTCALL PolyArrayDrawQStrip(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      nIndices;
    GLubyte    *aIndices;
    POLYDATA   *pd, *pd0;

    nIndices = pa->nIndices;
    aIndices = pa->aIndices;

    // If we are continuing with a previously decomposed quad strip, we need
    // to start from the last two vertices of the previous primitive.
    //
    // Note that the flush vertex ensures that the continuing quad strip
    // starts at an odd vertex so that it can fall through the normal code.

    if (pa->flags & POLYARRAY_PARTIAL_BEGIN)
    {
        // Insert previous end vertices at the beginning and update clip code
        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[1]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
        // Assert that aIndices[1] was initialized in Begin
        ASSERTOPENGL(!pa->aIndices || pa->aIndices[1] == 1,
                     "bad index mapping\n");

        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[0]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
        // Assert that aIndices[0] was initialized in Begin
        ASSERTOPENGL(!pa->aIndices || pa->aIndices[0] == 0,
                     "bad index mapping\n");
    }

    // Need at least 4 vertices.

    if (nIndices < 4)
    {
        ASSERTOPENGL(!(pa->flags & POLYARRAY_PARTIAL_END),
                     "Partial end with insufficient vertices\n");
        return;
    }

    // If the primitive is only partially complete, save the last two
    // vertices for next batch.

    if (pa->flags & POLYARRAY_PARTIAL_END)
    {
        pd0 = pa->pd0;
        pd  = aIndices ? &pd0[aIndices[nIndices-2]] : &pd0[nIndices-2];
        PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[0], pd);
        pd  = aIndices ? &pd0[aIndices[nIndices-1]] : &pd0[nIndices-1];
        PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[1], pd);

        // Need not render this partial primitive if it is completely clipped.

#ifdef POLYARRAY_AND_CLIPCODES
        if (pa->andClipCodes != 0)
            return;
#endif
    }

    // Assert that pa->nIndices is correct if aIndices is identity
    ASSERTOPENGL(pa->aIndices || pa->nIndices == pa->pdNextVertex - pa->pd0,
                 "bad nIndices\n");

    // Render the quad strip.

    // Call PolyArrayRenderQStrip later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
}
#endif // NEW_PARTIAL_PRIM

void FASTCALL PolyArrayRenderQStrip(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      i, iLast4;
    GLubyte    *aIndices;
    POLYDATA   *pd0;
    void (*rq)(__GLcontext *gc, __GLvertex *v0, __GLvertex *v1, __GLvertex *v2,
               __GLvertex *v3);

    iLast4 = pa->nIndices - 4;
    pd0    = pa->pd0;
    rq = pa->orClipCodes ? PARenderQuadSlow : PARenderQuadFast;
    if (iLast4 < 0)
        return;

    // Vertex ordering is important.  Line stippling uses it.

    if (!(aIndices = pa->aIndices))
    {
        // Identity mapping
        // Initialize first 2 vertices so we can start rendering the quad
        // below. The edge flags are not modified by our lower level routines.
        pd0[0].flags |= POLYDATA_EDGEFLAG_BOUNDARY;
        pd0[1].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

        for (i = 0; i <= iLast4; i += 2)
        {
            /* setup for rendering this quad */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[i+3];
            pd0[i+2].flags |= POLYDATA_EDGEFLAG_BOUNDARY;
            pd0[i+3].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

            /* Render the quad (NOTE: i, i+1, i+3, i+2) */
            (*rq)(gc, (__GLvertex *) &pd0[i  ],
                  (__GLvertex *) &pd0[i+1],
            (__GLvertex *) &pd0[i+3],
                  (__GLvertex *) &pd0[i+2]);
        }
    }
    else
    {
        // Initialize first 2 vertices so we can start rendering the quad
        // below.  The edge flags are not modified by our lower level routines.
        pd0[aIndices[0]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;
        pd0[aIndices[1]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

        for (i = 0; i <= iLast4; i += 2)
        {
            /* setup for rendering this quad */
            gc->line.notResetStipple = GL_FALSE;
            gc->vertex.provoking = (__GLvertex *) &pd0[aIndices[i+3]];
            pd0[aIndices[i+2]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;
            pd0[aIndices[i+3]].flags |= POLYDATA_EDGEFLAG_BOUNDARY;

            /* Render the quad (NOTE: i, i+1, i+3, i+2) */
            (*rq)(gc, (__GLvertex *) &pd0[aIndices[i  ]],
                  (__GLvertex *) &pd0[aIndices[i+1]],
            (__GLvertex *) &pd0[aIndices[i+3]],
                  (__GLvertex *) &pd0[aIndices[i+2]]);
        }
    }
}

// ---------------------------------------------------------
#ifndef NEW_PARTIAL_PRIM
void FASTCALL PolyArrayDrawPolygon(__GLcontext *gc, POLYARRAY *pa)
{
    GLint      nIndices;
    POLYDATA   *pd, *pd0;

    // Index mapping is always identity in Polygon.

    ASSERTOPENGL(!pa->aIndices, "Index mapping must be identity\n");

    nIndices = pa->nIndices;

    // If we are continuing with a previously decomposed polygon, we need to
    // insert the original first vertex and the last two vertices of the
    // previous polygon at the beginning of the current batch(see note below).
    // The decomposer expects the polygon vertices to be in sequential memory
    // order.

    if (pa->flags & POLYARRAY_PARTIAL_BEGIN)
    {
        ASSERTOPENGL(!(pa->flags & POLYARRAY_RESET_STIPPLE),
                     "bad stipple reset flag!\n");

        // Insert previous end vertices at the beginning and update clip code
        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[2]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif

        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[1]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif

        // Insert the origin first vertex at the beginning and update clip
        // code
        pd = --pa->pd0;
        ASSERTOPENGL(pd > (POLYDATA *) pa, "vertex underflows\n");
        PA_COPY_PROCESSED_VERTEX(pd, &gc->vertex.pdSaved[0]);
        pa->orClipCodes  |= pd->clipCode;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= pd->clipCode;
#endif
    }
    else
    {
      // New polygon.

      ASSERTOPENGL(pa->flags & POLYARRAY_RESET_STIPPLE,
                   "bad stipple reset flag!\n");
    }

// Need at least 3 vertices.

    if (nIndices < 3)
    {
        ASSERTOPENGL(!(pa->flags & POLYARRAY_PARTIAL_END),
                     "Partial end with insufficient vertices\n");
        ASSERTOPENGL(!(pa->flags & POLYARRAY_PARTIAL_BEGIN),
                     "Partial begin with insufficient vertices\n");
        return;
    }

    // If the primitive is only partially complete, save the last 2 vertices
    // for next batch.  Also save the original first vertex of the polygon.

    if (pa->flags & POLYARRAY_PARTIAL_END)
    {
        // Since there may be no vertex following this partial primitive, we
        // cannot determine the edge flag of the last vertex in this batch.
        // So we save the last vertex for next batch instead.

        pd0 = pa->pd0;
        pd  = &pd0[nIndices-1];
        PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[2], pd);

        // Remove the last vertex from this partial primitive
        nIndices = --pa->nIndices;
        pa->pdNextVertex--;

        // Mark the closing edge of this decomposed polygon as non-boundary
        // because we are synthetically generating it.

        pd--;
        PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[1], pd);
        pd->flags &= ~POLYDATA_EDGEFLAG_BOUNDARY;

        if (!(pa->flags & POLYARRAY_PARTIAL_BEGIN))
        {
            PA_COPY_PROCESSED_VERTEX(&gc->vertex.pdSaved[0], pd0);

            // Mark the first polygon vertex's edge tag as non-boundary
            // because when it gets rendered again it will no longer be
            // a boundary edge.
            gc->vertex.pdSaved[0].flags &= ~POLYDATA_EDGEFLAG_BOUNDARY;
        }

        // Need not render this partial primitive if it is completely clipped.

#ifdef POLYARRAY_AND_CLIPCODES
        if (pa->andClipCodes != 0)
            return;
#endif
    }

    // The polygon clipper can only handle this many vertices.
    ASSERTOPENGL(nIndices <= __GL_MAX_POLYGON_CLIP_SIZE,
                 "too many points for the polygon clipper!\n");

    // Assert that pa->nIndices is correct
    ASSERTOPENGL(pa->nIndices == pa->pdNextVertex - pa->pd0,
                 "bad nIndices\n");

    // Render the polygon.

    // Call PolyArrayRenderPolygon later
    pa->flags |= POLYARRAY_RENDER_PRIMITIVE;
}
#endif // NEW_PARTIAL_PRIM

void FASTCALL PolyArrayRenderPolygon(__GLcontext *gc, POLYARRAY *pa)
{
    // Index mapping is always identity in Polygon.

    ASSERTOPENGL(!pa->aIndices, "Index mapping must be identity\n");

    // Reset the line stipple if this is a new polygon.

    if (pa->flags & POLYARRAY_RESET_STIPPLE)
        gc->line.notResetStipple = GL_FALSE;

    // Note that the provoking vertex is set to pd0 in clipPolygon

    (*gc->procs.clipPolygon)(gc, (__GLvertex *) pa->pd0, pa->nIndices);
}

/****************************************************************************/
// Note: The first vertex must have a valid normal!
//
// IN:  obj/eye, normal
// OUT: eye, color.r (front or back depending on face) (all vertices are
//      updated)

void FASTCALL PolyArrayCalcCIColor(__GLcontext *gc, GLint face, POLYARRAY *pa, POLYDATA *pdFirst, POLYDATA *pdLast)
{
    __GLfloat nxi, nyi, nzi;
    __GLfloat zero;
    __GLlightSourceMachine *lsm;
    __GLmaterialState *ms;
    __GLmaterialMachine *msm;
    __GLfloat msm_threshold, msm_scale, *msm_specTable;
    __GLfloat ms_cmapa, ms_cmapd, ms_cmaps;
    __GLfloat si, di;
    POLYDATA  *pd;
    GLfloat   redMaxF;
    GLint     redMaxI;
    GLboolean eyeWIsZero, localViewer;
    static __GLcoord Pe = { 0, 0, 0, 1 };
#ifdef GL_WIN_specular_fog
    __GLfloat fog;
#endif //GL_WIN_specular_fog

    PERF_CHECK(FALSE, "Uses slow lights\n");

    zero = __glZero;

    if (face == __GL_FRONTFACE)
    {
        ms  = &gc->state.light.front;
        msm = &gc->light.front;
    }
    else
    {
        ms  = &gc->state.light.back;
        msm = &gc->light.back;
    }

    msm_scale     = msm->scale;
    msm_threshold = msm->threshold;
    msm_specTable = msm->specTable;
    ms_cmapa = ms->cmapa;
    ms_cmapd = ms->cmapd;
    ms_cmaps = ms->cmaps;
    localViewer = gc->state.light.model.localViewer;
    redMaxF = (GLfloat) gc->frontBuffer.redMax;
    redMaxI = (GLint) gc->frontBuffer.redMax;

// Eye coord should have been processed

    ASSERTOPENGL(pa->flags & POLYARRAY_EYE_PROCESSED, "need eye\n");

// NOTE: the following values may be re-used in the next iteration:
//       nxi, nyi, nzi

    for (pd = pdFirst; pd <= pdLast; pd++)
    {
        __GLfloat ci;

        if (pd->flags & POLYDATA_NORMAL_VALID)
        {
            if (face == __GL_FRONTFACE)
            {
            nxi = pd->normal.x;
            nyi = pd->normal.y;
            nzi = pd->normal.z;
            }
            else
            {
            nxi = -pd->normal.x;
            nyi = -pd->normal.y;
            nzi = -pd->normal.z;
            }
        }
        else
        {
            // use previous normal (nxi, nyi, nzi)!
#ifdef GL_WIN_specular_fog
            // use previous fog (fog)!
#endif  //GL_WIN_specular_fog
            ASSERTOPENGL(pd != pdFirst, "no initial normal\n");
        }

        si = zero;
        di = zero;
        eyeWIsZero = __GL_FLOAT_EQZ(pd->eye.w);
#ifdef GL_WIN_specular_fog
        // Initialize Fog value to 0 here;
        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
        {
            ASSERTOPENGL (face == __GL_FRONTFACE,
                          "Specular fog works for only GL_FRONT\n");
            fog = __glZero;
        }
#endif //GL_WIN_specular_fog


        for (lsm = gc->light.sources; lsm; lsm = lsm->next)
        {
            if (lsm->slowPath || eyeWIsZero)
            {
                __GLfloat n1, n2, att, attSpot;
                __GLcoord vPliHat, vPli, hHat, vPeHat;
                __GLfloat hv[3];

                /* Compute vPli, hi (normalized) */
                __glVecSub4(&vPli, &pd->eye, &lsm->position);
                __glNormalize(&vPliHat.x, &vPli.x);
                if (localViewer)
                {
                    __glVecSub4(&vPeHat, &pd->eye, &Pe);
                    __glNormalize(&vPeHat.x, &vPeHat.x);
                    hv[0] = vPliHat.x + vPeHat.x;
                    hv[1] = vPliHat.y + vPeHat.y;
                    hv[2] = vPliHat.z + vPeHat.z;
                }
                else
                {
                    hv[0] = vPliHat.x;
                    hv[1] = vPliHat.y;
                    hv[2] = vPliHat.z + __glOne;
                }
                __glNormalize(&hHat.x, hv);

                /* Compute attenuation */
                if (__GL_FLOAT_NEZ(lsm->position.w))
                {
                    __GLfloat k0, k1, k2, dist;

                    k0 = lsm->constantAttenuation;
                    k1 = lsm->linearAttenuation;
                    k2 = lsm->quadraticAttenuation;
                    if (__GL_FLOAT_EQZ(k1) && __GL_FLOAT_EQZ(k2))
                    {
                        /* Use pre-computed 1/k0 */
                        att = lsm->attenuation;
                    }
                    else
                    {

                dist = __GL_SQRTF(vPli.x*vPli.x + vPli.y*vPli.y
                                  + vPli.z*vPli.z);
                att = __glOne / (k0 + k1 * dist + k2 * dist * dist);
                    }
                }
                else
                {
                    att = __glOne;
                }

                /* Compute spot effect if light is a spot light */
                attSpot = att;
                if (lsm->isSpot)
                {
                    __GLfloat dot, px, py, pz;

                    px = -vPliHat.x;
                    py = -vPliHat.y;
                    pz = -vPliHat.z;
                    dot = px * lsm->direction.x + py * lsm->direction.y
                        + pz * lsm->direction.z;
                    if ((dot >= lsm->threshold) && (dot >= lsm->cosCutOffAngle))
                    {
                        GLint ix = (GLint)((dot - lsm->threshold) * lsm->scale
                                    + __glHalf);
                        if (ix < __GL_SPOT_LOOKUP_TABLE_SIZE)
                            attSpot = att * lsm->spotTable[ix];
                    }
                    else
                    {
                        attSpot = zero;
                    }
                }

                /* Add in remaining effect of light, if any */
                if (attSpot)
                {
                    n1 = nxi * vPliHat.x + nyi * vPliHat.y + nzi * vPliHat.z;
                    if (__GL_FLOAT_GTZ(n1)) {
                        n2 = nxi * hHat.x + nyi * hHat.y + nzi * hHat.z;
                        n2 -= msm_threshold;
                        if (__GL_FLOAT_GEZ(n2))
                        {
#ifdef NT
                            __GLfloat fx = n2 * msm_scale + __glHalf;
                            if( fx < (__GLfloat)__GL_SPEC_LOOKUP_TABLE_SIZE )
                                n2 = msm_specTable[(GLint)fx];
                            else
                                n2 = __glOne;
#ifdef GL_WIN_specular_fog
                            if (gc->polygon.shader.modeFlags &
                                __GL_SHADE_SPEC_FOG)
                            {
                                fog += attSpot * n2;
                            }
#endif //GL_WIN_specular_fog
#else
                            GLint ix = (GLint)(n2 * msm_scale + __glHalf);
                            if (ix < __GL_SPEC_LOOKUP_TABLE_SIZE)
                                n2 = msm_specTable[ix];
                            else
                                n2 = __glOne;
#endif
                            si += attSpot * n2 * lsm->sli;
                        }
                        di += attSpot * n1 * lsm->dli;
                    }
                }
            }
            else
            {
                __GLfloat n1, n2;

                /* Compute specular contribution */
                n1 = nxi * lsm->unitVPpli.x + nyi * lsm->unitVPpli.y +
                    nzi * lsm->unitVPpli.z;
                if (__GL_FLOAT_GTZ(n1))
                {
                    n2 = nxi * lsm->hHat.x + nyi * lsm->hHat.y + nzi * lsm->hHat.z;
                    n2 -= msm_threshold;
                    if (__GL_FLOAT_GEZ(n2))
                    {
#ifdef NT
                        __GLfloat fx = n2 * msm_scale + __glHalf;
                        if( fx < (__GLfloat)__GL_SPEC_LOOKUP_TABLE_SIZE )
                            n2 = msm_specTable[(GLint)fx];
                        else
                            n2 = __glOne;
#ifdef GL_WIN_specular_fog
                        if (gc->polygon.shader.modeFlags &
                            __GL_SHADE_SPEC_FOG)
                        {
                            fog += n2;
                        }
#endif //GL_WIN_specular_fog
#else
                        GLint ix = (GLint)(n2 * msm_scale + __glHalf);
                        if (ix < __GL_SPEC_LOOKUP_TABLE_SIZE)
                            n2 = msm_specTable[ix];
                        else
                            n2 = __glOne;
#endif
                        si += n2 * lsm->sli;
                    }
                    di += n1 * lsm->dli;
                }
            }
        }

        /* Compute final color */
        if (si > __glOne)
            si = __glOne;

        ci = ms_cmapa + (__glOne - si) * di * (ms_cmapd - ms_cmapa)
            + si * (ms_cmaps - ms_cmapa);
        if (ci > ms_cmaps)
            ci = ms_cmaps;

// need to mask color index before color clipping

        if (ci > redMaxF) {
            GLfloat fraction;
            GLint integer;

            integer = (GLint) ci;
            fraction = ci - (GLfloat) integer;
            integer = integer & redMaxI;
            ci = (GLfloat) integer + fraction;
        } else if (ci < 0) {
            GLfloat fraction;
            GLint integer;

            integer = (GLint) __GL_FLOORF(ci);
            fraction = ci - (GLfloat) integer;
            integer = integer & redMaxI;
            ci = (GLfloat) integer + fraction;
        }
        pd->colors[face].r = ci;
#ifdef GL_WIN_specular_fog
        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
        {
            pd->fog = 1.0 - fog;
            if (__GL_FLOAT_LTZ (pd->fog)) pd->fog = __glZero;
        }
#endif //GL_WIN_specular_fog
    }
}


// No slow lights version
// Note: The first vertex must have a valid normal!
//
// IN:  normal
// OUT: color.r (front or back depending on face) (all vertices are updated)

void FASTCALL PolyArrayFastCalcCIColor(__GLcontext *gc, GLint face, POLYARRAY *pa, POLYDATA *pdFirst, POLYDATA *pdLast)
{
    __GLfloat nxi, nyi, nzi;
    __GLfloat zero;
    __GLlightSourceMachine *lsm;
    __GLmaterialState *ms;
    __GLmaterialMachine *msm;
    __GLfloat msm_threshold, msm_scale, *msm_specTable;
    __GLfloat ms_cmapa, ms_cmapd, ms_cmaps;
    __GLfloat si, di;
    POLYDATA  *pd;
    GLfloat   redMaxF;
    GLint     redMaxI;
#ifdef GL_WIN_specular_fog
    __GLfloat fog;
#endif //GL_WIN_specular_fog

#if LATER
// if eye.w is zero, it should really take the slow path!
// Since the RGB version ignores it, we will also ignore it here.
// Even the original generic implementation may not have computed eye values.
#endif

    zero = __glZero;

    if (face == __GL_FRONTFACE)
    {
        ms  = &gc->state.light.front;
        msm = &gc->light.front;
    }
    else
    {
        ms  = &gc->state.light.back;
        msm = &gc->light.back;
    }

    msm_scale     = msm->scale;
    msm_threshold = msm->threshold;
    msm_specTable = msm->specTable;
    ms_cmapa = ms->cmapa;
    ms_cmapd = ms->cmapd;
    ms_cmaps = ms->cmaps;
    redMaxF = (GLfloat) gc->frontBuffer.redMax;
    redMaxI = (GLint) gc->frontBuffer.redMax;

// NOTE: the following values may be re-used in the next iteration:
//       nxi, nyi, nzi

    for (pd = pdFirst; pd <= pdLast; pd++)
    {
        __GLfloat ci;

        // If normal has not changed for this vertex, use the previously
        // computed color index.

        if (!(pd->flags & POLYDATA_NORMAL_VALID))
        {
            ASSERTOPENGL(pd != pdFirst, "no initial normal\n");
            pd->colors[face].r = (pd-1)->colors[face].r;
#ifdef GL_WIN_specular_fog
            // Initialize Fog value to 0 here;
            if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
            {
                ASSERTOPENGL (face == __GL_FRONTFACE,
                              "Specular fog works for only GL_FRONT\n");
                pd->fog = (pd-1)->fog;
            }
#endif //GL_WIN_specular_fog
            continue;
        }

        if (face == __GL_FRONTFACE)
        {
            nxi = pd->normal.x;
            nyi = pd->normal.y;
            nzi = pd->normal.z;
        }
        else
        {
            nxi = -pd->normal.x;
            nyi = -pd->normal.y;
            nzi = -pd->normal.z;
        }

        si = zero;
        di = zero;
#ifdef GL_WIN_specular_fog
        // Initialize Fog value to 0 here;
        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
        {
            fog = __glZero;
        }
#endif //GL_WIN_specular_fog

        for (lsm = gc->light.sources; lsm; lsm = lsm->next)
        {
            __GLfloat n1, n2;

            /* Compute specular contribution */
            n1 = nxi * lsm->unitVPpli.x + nyi * lsm->unitVPpli.y +
            nzi * lsm->unitVPpli.z;
            if (__GL_FLOAT_GTZ(n1))
        {
            n2 = nxi * lsm->hHat.x + nyi * lsm->hHat.y + nzi * lsm->hHat.z;
            n2 -= msm_threshold;
            if (__GL_FLOAT_GEZ(n2))
            {
#ifdef NT
                __GLfloat fx = n2 * msm_scale + __glHalf;
                if( fx < (__GLfloat)__GL_SPEC_LOOKUP_TABLE_SIZE )
                    n2 = msm_specTable[(GLint)fx];
                else
                    n2 = __glOne;
#else
                    GLint ix = (GLint)(n2 * msm_scale + __glHalf);
                    if (ix < __GL_SPEC_LOOKUP_TABLE_SIZE)
                        n2 = msm_specTable[ix];
                    else
                        n2 = __glOne;
#endif
                si += n2 * lsm->sli;
#ifdef GL_WIN_specular_fog
                    if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                    {
                        fog += n2;
                    }
#endif //GL_WIN_specular_fog
            }
            di += n1 * lsm->dli;
        }
        }

        /* Compute final color */
        if (si > __glOne)
            si = __glOne;

        ci = ms_cmapa + (__glOne - si) * di * (ms_cmapd - ms_cmapa)
            + si * (ms_cmaps - ms_cmapa);
        if (ci > ms_cmaps)
            ci = ms_cmaps;

// need to mask color index before color clipping
// SGIBUG: The sample implementation fails to do this!

        if (ci > redMaxF) {
            GLfloat fraction;
            GLint integer;

            integer = (GLint) ci;
            fraction = ci - (GLfloat) integer;
            integer = integer & redMaxI;
            ci = (GLfloat) integer + fraction;
        } else if (ci < 0) {
            GLfloat fraction;
            GLint integer;

            integer = (GLint) __GL_FLOORF(ci);
            fraction = ci - (GLfloat) integer;
            integer = integer & redMaxI;
            ci = (GLfloat) integer + fraction;
        }
        pd->colors[face].r = ci;
#ifdef GL_WIN_specular_fog
        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
        {
            pd->fog = 1.0 - fog;
            if (__GL_FLOAT_LTZ (pd->fog)) pd->fog = __glZero;
        }
#endif //GL_WIN_specular_fog
    }
}


// If both front and back colors are needed, the back colors must be computed
// first!  Otherwise, the front colors can be overwritten prematurely.
// Note: The first vertex must have valid normal and color!
//
// IN:  obj/eye, color (front), normal
// OUT: eye, color (front or back depending on face) (all vertices are updated)

void FASTCALL PolyArrayCalcRGBColor(__GLcontext *gc, GLint face, POLYARRAY *pa, POLYDATA *pdFirst, POLYDATA *pdLast)
{
    __GLfloat nxi, nyi, nzi;
    __GLfloat zero;
    __GLlightSourcePerMaterialMachine *lspmm;
    __GLlightSourceMachine *lsm;
    __GLlightSourceState *lss;
    __GLfloat ri, gi, bi;
    __GLfloat alpha;
    __GLfloat rsi, gsi, bsi;
    __GLcolor sceneColorI;
    __GLmaterialMachine *msm;
    __GLcolor lm_ambient;
    __GLfloat msm_alpha, msm_threshold, msm_scale, *msm_specTable;
    __GLcolor msm_paSceneColor;
    GLuint    msm_colorMaterialChange;
    POLYDATA  *pd;
    GLboolean eyeWIsZero, localViewer;
    static __GLcoord Pe = { 0, 0, 0, 1 };
#ifdef GL_WIN_specular_fog
    __GLfloat fog;
#endif //GL_WIN_specular_fog

    PERF_CHECK(FALSE, "Uses slow lights\n");

    zero = __glZero;

    // Eye coord should have been processed

    ASSERTOPENGL(pa->flags & POLYARRAY_EYE_PROCESSED, "need eye\n");

    if (face == __GL_FRONTFACE)
        msm = &gc->light.front;
    else
        msm = &gc->light.back;

    lm_ambient.r = gc->state.light.model.ambient.r;
    lm_ambient.g = gc->state.light.model.ambient.g;
    lm_ambient.b = gc->state.light.model.ambient.b;

    msm_scale     = msm->scale;
    msm_threshold = msm->threshold;
    msm_specTable = msm->specTable;
    msm_alpha     = msm->alpha;
    msm_colorMaterialChange = msm->colorMaterialChange;
    msm_paSceneColor = msm->paSceneColor;

    localViewer = gc->state.light.model.localViewer;

    // Get invarient scene color if there is no ambient or emissive color
    // material.

    sceneColorI.r = msm_paSceneColor.r;
    sceneColorI.g = msm_paSceneColor.g;
    sceneColorI.b = msm_paSceneColor.b;

    // NOTE: the following values may be re-used in the next iteration:
    //       ri, gi, bi, alpha, nxi, nyi, nzi, sceneColorI

    for (pd = pdFirst; pd <= pdLast; pd++)
    {
        if (pd->flags & POLYDATA_COLOR_VALID)
        {
            // Save latest colors normalized to 0..1

            ri = pd->colors[0].r * gc->oneOverRedVertexScale;
            gi = pd->colors[0].g * gc->oneOverGreenVertexScale;
            bi = pd->colors[0].b * gc->oneOverBlueVertexScale;
            alpha = pd->colors[0].a;

            // Compute scene color.
            // If color has not changed, the previous sceneColorI values are
            // used!

            if (msm_colorMaterialChange & (__GL_MATERIAL_AMBIENT |
                                           __GL_MATERIAL_EMISSIVE))
            {
                if (msm_colorMaterialChange & __GL_MATERIAL_AMBIENT)
                {
                    sceneColorI.r = msm_paSceneColor.r + ri * lm_ambient.r;
                    sceneColorI.g = msm_paSceneColor.g + gi * lm_ambient.g;
                    sceneColorI.b = msm_paSceneColor.b + bi * lm_ambient.b;
                }
                else
                {
                    sceneColorI.r = msm_paSceneColor.r + pd->colors[0].r;
                    sceneColorI.g = msm_paSceneColor.g + pd->colors[0].g;
                    sceneColorI.b = msm_paSceneColor.b + pd->colors[0].b;
                }
            }
        }
        else
        {
            // use previous ri, gi, bi, alpha, and sceneColorI!
            ASSERTOPENGL(pd != pdFirst, "no initial color\n");
        }

        // Compute the diffuse and specular components for this vertex.

        if (pd->flags & POLYDATA_NORMAL_VALID)
        {
            if (face == __GL_FRONTFACE)
            {
                nxi = pd->normal.x;
                nyi = pd->normal.y;
                nzi = pd->normal.z;
            }
            else
            {
                nxi = -pd->normal.x;
                nyi = -pd->normal.y;
                nzi = -pd->normal.z;
            }
#ifdef GL_WIN_specular_fog
            // Initialize Fog value to 0 here;
            if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
            {
                ASSERTOPENGL (face == __GL_FRONTFACE,
                              "Specular fog works for only GL_FRONT\n");
                fog = __glZero;
            }
#endif //GL_WIN_specular_fog
        }
        else
        {
            // use previous normal (nxi, nyi, nzi)!
            ASSERTOPENGL(pd != pdFirst, "no initial normal\n");
#ifdef GL_WIN_specular_fog
            // use previous fog (fog)!
#endif //GL_WIN_specular_fog
        }

        rsi = sceneColorI.r;
        gsi = sceneColorI.g;
        bsi = sceneColorI.b;

        eyeWIsZero = __GL_FLOAT_EQZ(pd->eye.w);

        for (lsm = gc->light.sources; lsm; lsm = lsm->next)
        {
            __GLfloat n1, n2;

            lss = lsm->state;
            lspmm = &lsm->front + face;

            if (lsm->slowPath || eyeWIsZero)
            {
                __GLcoord hHat, vPli, vPliHat, vPeHat;
                __GLfloat att, attSpot;
                __GLfloat hv[3];

                /* Compute unit h[i] */
                __glVecSub4(&vPli, &pd->eye, &lsm->position);
                __glNormalize(&vPliHat.x, &vPli.x);
                if (localViewer)
                {
                    __glVecSub4(&vPeHat, &pd->eye, &Pe);
                    __glNormalize(&vPeHat.x, &vPeHat.x);
                    hv[0] = vPliHat.x + vPeHat.x;
                    hv[1] = vPliHat.y + vPeHat.y;
                    hv[2] = vPliHat.z + vPeHat.z;
                }
                else
                {
                    hv[0] = vPliHat.x;
                    hv[1] = vPliHat.y;
                    hv[2] = vPliHat.z + __glOne;
                }
                __glNormalize(&hHat.x, hv);

                /* Compute attenuation */
                if (__GL_FLOAT_NEZ(lsm->position.w))
                {
                    __GLfloat k0, k1, k2, dist;

                    k0 = lsm->constantAttenuation;
                    k1 = lsm->linearAttenuation;
                    k2 = lsm->quadraticAttenuation;
                    if (__GL_FLOAT_EQZ(k1) && __GL_FLOAT_EQZ(k2))
                    {
                        /* Use pre-computed 1/k0 */
                        att = lsm->attenuation;
                    }
                    else
                    {
                        dist = __GL_SQRTF(vPli.x*vPli.x + vPli.y*vPli.y
                                      + vPli.z*vPli.z);
                        att = __glOne / (k0 + k1 * dist + k2 * dist * dist);
                    }
                }
                else
                {
                    att = __glOne;
                }

                /* Compute spot effect if light is a spot light */
                attSpot = att;
                if (lsm->isSpot)
                {
                    __GLfloat dot, px, py, pz;

                    px = -vPliHat.x;
                    py = -vPliHat.y;
                    pz = -vPliHat.z;
                    dot = px * lsm->direction.x + py * lsm->direction.y
                      + pz * lsm->direction.z;
                    if ((dot >= lsm->threshold) && (dot >= lsm->cosCutOffAngle))
                      {
                        GLint ix = (GLint)((dot - lsm->threshold) * lsm->scale
                                           + __glHalf);
                        if (ix < __GL_SPOT_LOOKUP_TABLE_SIZE)
                          attSpot = att * lsm->spotTable[ix];
                      }
                    else
                      {
                        attSpot = zero;
                      }
                }

                /* Add in remaining effect of light, if any */
                if (attSpot)
                {
                    __GLfloat n1, n2;
                    __GLcolor sum;

                    if (msm_colorMaterialChange & __GL_MATERIAL_AMBIENT)
                    {
                        sum.r = ri * lss->ambient.r;
                        sum.g = gi * lss->ambient.g;
                        sum.b = bi * lss->ambient.b;
                    }
                    else
                    {
                        sum.r = lspmm->ambient.r;
                        sum.g = lspmm->ambient.g;
                        sum.b = lspmm->ambient.b;
                    }

                    n1 = nxi * vPliHat.x + nyi * vPliHat.y + nzi * vPliHat.z;
                    if (__GL_FLOAT_GTZ(n1))
                    {
                        n2 = nxi * hHat.x + nyi * hHat.y + nzi * hHat.z;
                        n2 -= msm_threshold;
                        if (__GL_FLOAT_GEZ(n2))
                        {
#ifdef NT
                            __GLfloat fx = n2 * msm_scale + __glHalf;
                            if( fx < (__GLfloat)__GL_SPEC_LOOKUP_TABLE_SIZE )
                              n2 = msm_specTable[(GLint)fx];
                            else
                              n2 = __glOne;
#ifdef GL_WIN_specular_fog
                            if (gc->polygon.shader.modeFlags &
                                __GL_SHADE_SPEC_FOG)
                            {
                                fog += attSpot * n2;
                            }
#endif //GL_WIN_specular_fog
#else
                            GLint ix = (GLint)(n2 * msm_scale + __glHalf);
                            if (ix < __GL_SPEC_LOOKUP_TABLE_SIZE)
                              n2 = msm_specTable[ix];
                            else
                              n2 = __glOne;
#endif
                            if (msm_colorMaterialChange & __GL_MATERIAL_SPECULAR)
                            {
                                /* Recompute per-light per-material cached specular */
                                sum.r += n2 * ri * lss->specular.r;
                                sum.g += n2 * gi * lss->specular.g;
                                sum.b += n2 * bi * lss->specular.b;
                            }
                            else
                            {
                                sum.r += n2 * lspmm->specular.r;
                                sum.g += n2 * lspmm->specular.g;
                                sum.b += n2 * lspmm->specular.b;
                            }
                        }
                        if (msm_colorMaterialChange & __GL_MATERIAL_DIFFUSE)
                          {
                            /* Recompute per-light per-material cached diffuse */
                            sum.r += n1 * ri * lss->diffuse.r;
                            sum.g += n1 * gi * lss->diffuse.g;
                            sum.b += n1 * bi * lss->diffuse.b;
                          }
                        else
                          {
                            sum.r += n1 * lspmm->diffuse.r;
                            sum.g += n1 * lspmm->diffuse.g;
                            sum.b += n1 * lspmm->diffuse.b;
                          }
                    }

                    rsi += attSpot * sum.r;
                    gsi += attSpot * sum.g;
                    bsi += attSpot * sum.b;
                }
            }
            else
            {
                __GLfloat n1, n2;

                if (msm_colorMaterialChange & __GL_MATERIAL_AMBIENT)
                {
                    rsi += ri * lss->ambient.r;
                    gsi += gi * lss->ambient.g;
                    bsi += bi * lss->ambient.b;
                }
                else
                {
                    rsi += lspmm->ambient.r;
                    gsi += lspmm->ambient.g;
                    bsi += lspmm->ambient.b;
                }

                /* Add in specular and diffuse effect of light, if any */
                n1 = nxi * lsm->unitVPpli.x + nyi * lsm->unitVPpli.y +
                  nzi * lsm->unitVPpli.z;
                if (__GL_FLOAT_GTZ(n1))
                {
                    n2 = nxi * lsm->hHat.x + nyi * lsm->hHat.y + nzi * lsm->hHat.z;
                    n2 -= msm_threshold;
                    if (__GL_FLOAT_GEZ(n2)) {
#ifdef NT
                      __GLfloat fx = n2 * msm_scale + __glHalf;
                      if( fx < (__GLfloat)__GL_SPEC_LOOKUP_TABLE_SIZE )
                        n2 = msm_specTable[(GLint)fx];
                      else
                        n2 = __glOne;
#ifdef GL_WIN_specular_fog
                        if (gc->polygon.shader.modeFlags &
                            __GL_SHADE_SPEC_FOG)
                        {
                            fog += n2;
                        }
#endif //GL_WIN_specular_fog
#else
                      GLint ix = (GLint)(n2 * msm_scale + __glHalf);
                      if (ix < __GL_SPEC_LOOKUP_TABLE_SIZE)
                        n2 = msm_specTable[ix];
                      else
                        n2 = __glOne;
#endif
                      if (msm_colorMaterialChange & __GL_MATERIAL_SPECULAR)
                        {
                            /* Recompute per-light per-material cached
                               specular */
                          rsi += n2 * ri * lss->specular.r;
                          gsi += n2 * gi * lss->specular.g;
                          bsi += n2 * bi * lss->specular.b;
                        }
                      else
                        {
                          rsi += n2 * lspmm->specular.r;
                          gsi += n2 * lspmm->specular.g;
                          bsi += n2 * lspmm->specular.b;
                        }
                    }
                    if (msm_colorMaterialChange & __GL_MATERIAL_DIFFUSE)
                      {
                        /* Recompute per-light per-material cached diffuse */
                        rsi += n1 * ri * lss->diffuse.r;
                        gsi += n1 * gi * lss->diffuse.g;
                        bsi += n1 * bi * lss->diffuse.b;
                      }
                    else
                      {
                        rsi += n1 * lspmm->diffuse.r;
                        gsi += n1 * lspmm->diffuse.g;
                        bsi += n1 * lspmm->diffuse.b;
                      }
                }
            }
        }

        {
            __GLcolor *pd_color_dst;

            pd_color_dst = &pd->colors[face];

            __GL_CLAMP_RGB(pd_color_dst->r,
                           pd_color_dst->g,
                           pd_color_dst->b,
                           gc, rsi, gsi, bsi);

            if (msm_colorMaterialChange & __GL_MATERIAL_DIFFUSE)
            {
                if (pa->flags & POLYARRAY_CLAMP_COLOR)
                {
                    __GL_CLAMP_A(pd_color_dst->a, gc, alpha);
                }
                else
                    pd_color_dst->a = alpha;
            }
            else
            {
                pd_color_dst->a = msm_alpha;
            }
#ifdef GL_WIN_specular_fog
            if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
            {
                  pd->fog = 1.0 - fog;
                  if (__GL_FLOAT_LTZ (pd->fog)) pd->fog = __glZero;
            }
#endif //GL_WIN_specular_fog
        }
    }
}

// If both front and back colors are needed, the back color must be computed
// first!  Otherwise, the front color can be overwritten prematurely.
// Note: The first vertex must have valid normal and color!
//
// IN:  color (front), normal
// OUT: color (front or back depending on face) (all vertices are updated)

#ifndef __GL_ASM_POLYARRAYFASTCALCRGBCOLOR
void FASTCALL PolyArrayFastCalcRGBColor(__GLcontext *gc, GLint face, POLYARRAY *pa, POLYDATA *pdFirst, POLYDATA *pdLast)
{
    __GLfloat nxi, nyi, nzi;
    __GLlightSourcePerMaterialMachine *lspmm;
    __GLlightSourceMachine *lsm;
    __GLlightSourceState *lss;
    __GLfloat ri, gi, bi;
    __GLfloat alpha;
        // Don't use a structure.  Compiler wants to store it on the stack,
        // even though that's not necessary.
    __GLfloat baseEmissiveAmbient_r, emissiveAmbientI_r, diffuseSpecularI_r;
    __GLfloat baseEmissiveAmbient_g, emissiveAmbientI_g, diffuseSpecularI_g;
    __GLfloat baseEmissiveAmbient_b, emissiveAmbientI_b, diffuseSpecularI_b;
    __GLfloat lm_ambient_r;
        __GLfloat lm_ambient_g;
        __GLfloat lm_ambient_b;
    __GLmaterialMachine *msm, *msm_front, *msm_back;
    __GLfloat msm_alpha, msm_threshold, msm_scale, *msm_specTable;
    GLuint    msm_colorMaterialChange;
    POLYDATA  *pd;
        __GLfloat diff_r, diff_g, diff_b;
        __GLfloat spec_r, spec_g, spec_b;
        __GLcolor *lss_diff_color, *lss_spec_color;
        __GLcolor *lspmm_diff_color, *lspmm_spec_color;
        __GLcolor *diff_color, *spec_color;
        GLuint use_material_diffuse, use_material_specular;
        GLuint use_material_ambient, use_material_emissive;
        __GLfloat spec_r_sum, spec_g_sum, spec_b_sum;
        __GLfloat diff_r_sum, diff_g_sum, diff_b_sum;
        __GLfloat ambient_r_sum, ambient_g_sum, ambient_b_sum;
        GLuint pd_flags, normal_valid, color_valid;
#ifdef GL_WIN_specular_fog
    __GLfloat fog;
#endif //GL_WIN_specular_fog


#if LATER
        // if eye.w is zero, it should really take the slow path!
        // Since the sample implementation ignores it, we will also ignore it here.
#endif

    PERF_CHECK(FALSE, "Primitives contain glColorMaterial calls\n");

        msm_front = &gc->light.front;
        msm_back = &gc->light.back;
        msm = msm_back;
    if (face == __GL_FRONTFACE)
                msm = msm_front;

        // If there is no color material change for this face, we can call the
        // zippy function!

    msm_colorMaterialChange = msm->colorMaterialChange;
    if (!msm_colorMaterialChange)
    {
                PolyArrayZippyCalcRGBColor(gc, face, pa, pdFirst, pdLast);
                return;
    }

        // Compute invarient emissive and ambient components for this vertex.

    lm_ambient_r = gc->state.light.model.ambient.r;
    lm_ambient_g = gc->state.light.model.ambient.g;
    lm_ambient_b = gc->state.light.model.ambient.b;

    msm_scale     = msm->scale;
    msm_threshold = msm->threshold;
    msm_specTable = msm->specTable;
    msm_alpha     = msm->alpha;

    use_material_ambient = msm_colorMaterialChange & __GL_MATERIAL_AMBIENT;
    use_material_emissive = msm_colorMaterialChange & __GL_MATERIAL_EMISSIVE;

    if (!use_material_ambient) {
        baseEmissiveAmbient_r = msm->cachedEmissiveAmbient.r;
        baseEmissiveAmbient_g = msm->cachedEmissiveAmbient.g;
        baseEmissiveAmbient_b = msm->cachedEmissiveAmbient.b;
    } else {
        baseEmissiveAmbient_r = msm->paSceneColor.r;
        baseEmissiveAmbient_g = msm->paSceneColor.g;
        baseEmissiveAmbient_b = msm->paSceneColor.b;
    }

        // If there is no emissive or ambient color material change, this
        // will be the emissive and ambient components.

        emissiveAmbientI_r = baseEmissiveAmbient_r;
        emissiveAmbientI_g = baseEmissiveAmbient_g;
        emissiveAmbientI_b = baseEmissiveAmbient_b;

        use_material_diffuse = msm_colorMaterialChange & __GL_MATERIAL_DIFFUSE;
        use_material_specular = msm_colorMaterialChange & __GL_MATERIAL_SPECULAR;

        // NOTE: the following values may be re-used in the next iteration:
        //       ri, gi, bi, alpha, nxi, nyi, nzi, emissiveAmbientI, diffuseSpecularI

        for (pd = pdFirst; pd <= pdLast; pd++)
        {
                // If color and normal have not changed for this vertex, use the previously
                // computed color.

                pd_flags = pd->flags;
                normal_valid = pd_flags & POLYDATA_NORMAL_VALID;
                color_valid = pd_flags & POLYDATA_COLOR_VALID;

                if (!(normal_valid || color_valid))
                {
                        ASSERTOPENGL(pd != pdFirst, "no initial normal and color\n");
                        pd->colors[face] = (pd-1)->colors[face];
#ifdef GL_WIN_specular_fog
                        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                        {
                                pd->fog = (pd-1)->fog;
                        }
#endif //GL_WIN_specular_fog
                        continue;
                }

                if (color_valid)
                {
                        __GLfloat pd_r, pd_g, pd_b;

            // Save latest colors normalized to 0..1

                        pd_r = pd->colors[0].r;
                        pd_g = pd->colors[0].g;
                        pd_b = pd->colors[0].b;
                        ri = pd_r * gc->oneOverRedVertexScale;
                        gi = pd_g * gc->oneOverGreenVertexScale;
                        bi = pd_b * gc->oneOverBlueVertexScale;
                        alpha = pd->colors[0].a;

                        // Compute the emissive and ambient components for this vertex if necessary.
                        // If color has not changed, the previous emissveAmbientI values are used!

                        if (use_material_ambient || use_material_emissive)
                        {
                                if (use_material_ambient)
                                {
                                        ambient_r_sum = lm_ambient_r;
                                        ambient_g_sum = lm_ambient_g;
                                        ambient_b_sum = lm_ambient_b;

                                        // Add per-light per-material ambient
                                        for (lsm = gc->light.sources; lsm; lsm = lsm->next)
                                        {
                                                lss = lsm->state;
                                                ambient_r_sum += lss->ambient.r;
                                                ambient_g_sum += lss->ambient.g;
                                                ambient_b_sum += lss->ambient.b;
                                        }

                                        ambient_r_sum *= ri;
                                        ambient_g_sum *= gi;
                                        ambient_b_sum *= bi;

                                        emissiveAmbientI_r = baseEmissiveAmbient_r + ambient_r_sum;
                                        emissiveAmbientI_g = baseEmissiveAmbient_g + ambient_g_sum;
                                        emissiveAmbientI_b = baseEmissiveAmbient_b + ambient_b_sum;

                                }
                                else
                                {
                                        emissiveAmbientI_r = baseEmissiveAmbient_r + pd_r;
                                        emissiveAmbientI_g = baseEmissiveAmbient_g + pd_g;
                                        emissiveAmbientI_b = baseEmissiveAmbient_b + pd_b;
                                }
                        }
                }
                else
                {
                        // use previous ri, gi, bi, alpha, and emissiveAmbientI!
                        ASSERTOPENGL(pd != pdFirst, "no initial color\n");
                }

                // Compute the diffuse and specular components for this vertex.

                if (normal_valid)
                {
                        nxi = pd->normal.x;
                        nyi = pd->normal.y;
                        nzi = pd->normal.z;
                        if (face != __GL_FRONTFACE)
                        {
                                nxi = -nxi;
                                nyi = -nyi;
                                nzi = -nzi;
                        }
#ifdef GL_WIN_specular_fog
            // Initialize Fog value to 0 here;
            if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
            {
                ASSERTOPENGL (face == __GL_FRONTFACE,
                              "Specular fog works for only GL_FRONT\n");
                fog = __glZero;
            }
#endif //GL_WIN_specular_fog

                }
                else
                {
                        ASSERTOPENGL(pd != pdFirst, "no initial normal\n");

                        // If normal and diffuse and specular components have not changed,
                        // use the previously computed diffuse and specular values.
                        // otherwise, use previous normal (nxi, nyi, nzi) and
                        // diffuseSpecularI!

                        if (!(use_material_diffuse || use_material_specular))
                                goto store_color;
                }

                spec_r_sum = (__GLfloat)0.0;
                spec_g_sum = (__GLfloat)0.0;
                spec_b_sum = (__GLfloat)0.0;
                diff_r_sum = (__GLfloat)0.0;
                diff_g_sum = (__GLfloat)0.0;
                diff_b_sum = (__GLfloat)0.0;

                for (lsm = gc->light.sources; lsm; lsm = lsm->next)
                {
                        __GLfloat n1, n2;

                        lss = lsm->state;
                        lspmm = &lsm->front + face;

                        lss_diff_color = &lss->diffuse;
                        lss_spec_color = &lss->specular;
                        lspmm_diff_color = &lspmm->diffuse;
                        lspmm_spec_color = &lspmm->specular;

                        diff_color = lspmm_diff_color;
                        spec_color = lspmm_spec_color;
                        if (use_material_diffuse)
                                diff_color = lss_diff_color;
                        if (use_material_specular)
                                spec_color = lss_spec_color;

                        /* Add in specular and diffuse effect of light, if any */
                        n1 = nxi * lsm->unitVPpli.x + nyi * lsm->unitVPpli.y +
                                nzi * lsm->unitVPpli.z;
                        if (n1 > 0.0)
                        {
                                diff_r = diff_color->r;
                                diff_g = diff_color->g;
                                diff_b = diff_color->b;

                                n2 = nxi * lsm->hHat.x + nyi * lsm->hHat.y + nzi * lsm->hHat.z;
                                n2 -= msm_threshold;
                                if (n2 >= 0.0)
                                {
                                        __GLfloat fx = n2 * msm_scale + __glHalf;

                                        spec_r = spec_color->r;
                                        spec_g = spec_color->g;
                                        spec_b = spec_color->b;

                                        if( fx < (__GLfloat)__GL_SPEC_LOOKUP_TABLE_SIZE ){
                                                n2 = msm_specTable[(GLint)fx];
                                                spec_r *= n2;
                                                spec_g *= n2;
                                                spec_b *= n2;
                                        }
                                        /* else n2 = 1.0.
                                        Before, we multiplied (spec_r *= n2) in all cases.
                                        But since n2 == 1.0, there's no need to do it in this case.
                                        Thus there is no need to load n2 = 1.0. */

#ifdef GL_WIN_specular_fog
                                        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                                        {
                                                pd->fog += n2;
                                        }
#endif //GL_WIN_specular_fog


                                        spec_r_sum += spec_r;
                                        spec_g_sum += spec_g;
                                        spec_b_sum += spec_b;
                                }

                                diff_r *= n1;
                                diff_g *= n1;
                                diff_b *= n1;

                                diff_r_sum += diff_r;
                                diff_g_sum += diff_g;
                                diff_b_sum += diff_b;
                        }
                }

                if (use_material_specular){
                        /* Recompute per-light per-material cached specular */
                        spec_r_sum *= ri;
                        spec_g_sum *= gi;
                        spec_b_sum *= bi;
                }
                if (use_material_diffuse){
                        /* Recompute per-light per-material cached diffuse */
                        diff_r_sum *= ri;
                        diff_g_sum *= gi;
                        diff_b_sum *= bi;
                }

                diffuseSpecularI_r = diff_r_sum + spec_r_sum;
                diffuseSpecularI_g = diff_g_sum + spec_g_sum;
                diffuseSpecularI_b = diff_b_sum + spec_b_sum;


store_color:
                {
                        __GLcolor *pd_color_dst;

                        pd_color_dst = &pd->colors[face];

                        __GL_CLAMP_RGB( pd_color_dst->r,
                                                        pd_color_dst->g,
                                                        pd_color_dst->b,
                                                        gc,
                                                        emissiveAmbientI_r + diffuseSpecularI_r,
                                                        emissiveAmbientI_g + diffuseSpecularI_g,
                                                        emissiveAmbientI_b + diffuseSpecularI_b);

                        if (msm_colorMaterialChange & __GL_MATERIAL_DIFFUSE)
                        {
                                if (pa->flags & POLYARRAY_CLAMP_COLOR)
                                {
                                    __GL_CLAMP_A(pd_color_dst->a, gc, alpha);
                                }
                                else
                                        pd_color_dst->a = alpha;
                        }
                        else
                        {
                                pd_color_dst->a = msm_alpha;
                        }
#ifdef GL_WIN_specular_fog
                        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                        {
                                pd->fog = 1.0 - fog;
                                if (__GL_FLOAT_LTZ (pd->fog)) pd->fog = __glZero;
                        }
#endif //GL_WIN_specular_fog

                }
        }
}
#endif // __GL_ASM_POLYARRAYFASTCALCRGBCOLOR


// This function is called when color material is disabled and there are no
// slow lights.
//
// Note: The first vertex must have a valid normal!
//
// IN:  normal
// OUT: color (front or back depending on face) (all vertices are updated)

#ifndef __GL_ASM_POLYARRAYZIPPYCALCRGBCOLOR
void FASTCALL PolyArrayZippyCalcRGBColor(__GLcontext *gc, GLint face, POLYARRAY *pa, POLYDATA *pdFirst, POLYDATA *pdLast)
{
    register __GLfloat nxi, nyi, nzi;
    __GLlightSourcePerMaterialMachine *lspmm;
    __GLlightSourceMachine *lsm;
    __GLlightSourceState *lss;
    __GLfloat baseEmissiveAmbient_r, baseEmissiveAmbient_g, baseEmissiveAmbient_b;
    __GLmaterialMachine *msm;
    __GLfloat msm_alpha, msm_threshold, msm_scale, *msm_specTable;
    __GLcolor *pd_color_dst;
    GLboolean notBackface = FALSE;
    POLYDATA  *pd;
    ULONG normal_valid, paneeds_valid;
    register GLfloat diff_r, diff_g, diff_b;
    register GLfloat spec_r, spec_g, spec_b;
    GLfloat lsmx, lsmy, lsmz;
    ULONG fast_path = 0;
#ifdef GL_WIN_specular_fog
    __GLfloat fog;
#endif //GL_WIN_specular_fog


#if LATER
// if eye.w is zero, it should really take the slow path!
// Since the sample implementation ignores it, we will also ignore it here.
#endif

    if (face == __GL_FRONTFACE)
        msm = &gc->light.front;
    else
        msm = &gc->light.back;

    lsm = gc->light.sources;
    if (lsm && !lsm->next)
        fast_path = 1;

    msm_scale     = msm->scale;
    msm_threshold = msm->threshold;
    msm_specTable = msm->specTable;
    msm_alpha     = msm->alpha;

// Compute invarient emissive and ambient components for this vertex.

    baseEmissiveAmbient_r = msm->cachedEmissiveAmbient.r;
    baseEmissiveAmbient_g = msm->cachedEmissiveAmbient.g;
    baseEmissiveAmbient_b = msm->cachedEmissiveAmbient.b;


// NOTE: the following values may be re-used in the next iteration:
//       nxi, nyi, nzi

#ifdef GL_WIN_specular_fog
    if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
    {
        ASSERTOPENGL (face == __GL_FRONTFACE,
                      "Specular fog works only with GL_FRONT\n");
    }
#endif //GL_WIN_specular_fog


    if (fast_path)
    {
        __GLfloat n1, n2;

        lspmm = &lsm->front + face;
        lss = lsm->state;
        lsmx = lsm->unitVPpli.x;
        lsmy = lsm->unitVPpli.y;
        lsmz = lsm->unitVPpli.z;

        diff_r = lspmm->diffuse.r;
        diff_g = lspmm->diffuse.g;
        diff_b = lspmm->diffuse.b;

        spec_r = lspmm->specular.r;
        spec_g = lspmm->specular.g;
        spec_b = lspmm->specular.b;

        for (pd = pdFirst; pd <= pdLast; pd++)
        {
                __GLfloat rsi, gsi, bsi;

// If normal has not changed for this vertex, use the previously computed color.

                normal_valid = pd->flags & POLYDATA_NORMAL_VALID;
                paneeds_valid = gc->vertex.paNeeds & PANEEDS_NORMAL;

                if (!(normal_valid))
                {
                        ASSERTOPENGL(pd != pdFirst, "no initial normal\n");
                        pd->colors[face] = (pd-1)->colors[face];
#ifdef GL_WIN_specular_fog
                        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                        {
                                pd->fog = (pd-1)->fog;
                        }
#endif //GL_WIN_specular_fog
                        continue;
                }

                if (face == __GL_FRONTFACE)
                {
                        nxi = pd->normal.x;
                        nyi = pd->normal.y;
                        nzi = pd->normal.z;
                }
                else
                {
                        nxi = -pd->normal.x;
                        nyi = -pd->normal.y;
                        nzi = -pd->normal.z;
                }

#ifdef GL_WIN_specular_fog
                if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                {
                        fog = __glZero;
                }
#endif //GL_WIN_specular_fog

                rsi = baseEmissiveAmbient_r;
                gsi = baseEmissiveAmbient_g;
                bsi = baseEmissiveAmbient_b;

// Compute the diffuse and specular components for this vertex.

        /* Add in specular and diffuse effect of light, if any */

                n1 = nxi * lsmx + nyi * lsmy + nzi * lsmz;
                pd_color_dst = &pd->colors[face];
                if (n1 > 0.0)
                {
                        n2 = (nxi * lsm->hHat.x + nyi * lsm->hHat.y + nzi * lsm->hHat.z)
                        - msm_threshold;

                        rsi += n1 * diff_r;
                        gsi += n1 * diff_g;
                        bsi += n1 * diff_b;

                        if (n2 >= 0.0)
                        {
                                GLint ix = (GLint)(n2 * msm_scale + __glHalf);

                                if (ix < __GL_SPEC_LOOKUP_TABLE_SIZE)
                                        n2 = msm_specTable[ix];
                                else
                                        n2 = __glOne;

#ifdef GL_WIN_specular_fog
                                if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                                {
                                        fog += n2;
                                }
#endif //GL_WIN_specular_fog


                                rsi += n2 * spec_r;
                                gsi += n2 * spec_g;
                                bsi += n2 * spec_b;
                        }
                        pd_color_dst->r = rsi;
                        pd_color_dst->g = gsi;
                        pd_color_dst->b = bsi;
                        if (__GL_COLOR_CHECK_CLAMP_RGB(gc, rsi, gsi, bsi)) {
                                __GL_CLAMP_RGB(pd_color_dst->r,
                               pd_color_dst->g,
                               pd_color_dst->b,
                               gc, rsi, gsi, bsi);
                        }
                        pd_color_dst->a = msm_alpha;
                }
                else
                {
                        pd_color_dst->r = msm->cachedNonLit.r;
                        pd_color_dst->g = msm->cachedNonLit.g;
                        pd_color_dst->b = msm->cachedNonLit.b;
                        pd_color_dst->a = msm_alpha;
                }
        }
    }
    else
    {
        for (pd = pdFirst; pd <= pdLast; pd++)
        {
                __GLfloat rsi, gsi, bsi;

// If normal has not changed for this vertex, use the previously computed color.

                normal_valid = pd->flags & POLYDATA_NORMAL_VALID;
                paneeds_valid = gc->vertex.paNeeds & PANEEDS_NORMAL;

                if (!(normal_valid))
                {
                        ASSERTOPENGL(pd != pdFirst, "no initial normal\n");
                        pd->colors[face] = (pd-1)->colors[face];
#ifdef GL_WIN_specular_fog
                        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                        {
                                pd->fog = (pd-1)->fog;
                        }
#endif //GL_WIN_specular_fog
                        continue;
                }


                if (face == __GL_FRONTFACE)
                {
                        nxi = pd->normal.x;
                        nyi = pd->normal.y;
                        nzi = pd->normal.z;
                }
                else
                {
                        nxi = -pd->normal.x;
                        nyi = -pd->normal.y;
                        nzi = -pd->normal.z;
                }

#ifdef GL_WIN_specular_fog
                if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                {
                        fog = __glZero;
                }
#endif //GL_WIN_specular_fog

                rsi = baseEmissiveAmbient_r;
                gsi = baseEmissiveAmbient_g;
                bsi = baseEmissiveAmbient_b;

// Compute the diffuse and specular components for this vertex.

                for (lsm = gc->light.sources; lsm; lsm = lsm->next)
                {
                        __GLfloat n1, n2;

                        lspmm = &lsm->front + face;
                        lss = lsm->state;
                        lsmx = lsm->unitVPpli.x;
                        lsmy = lsm->unitVPpli.y;
                        lsmz = lsm->unitVPpli.z;

                        diff_r = lspmm->diffuse.r;
                        diff_g = lspmm->diffuse.g;
                        diff_b = lspmm->diffuse.b;

            /* Add in specular and diffuse effect of light, if any */

                        n1 = nxi * lsmx + nyi * lsmy + nzi * lsmz;

                        if (n1 > 0.0)
                        {
                                notBackface = TRUE;

                                n2 = (nxi * lsm->hHat.x + nyi * lsm->hHat.y + nzi * lsm->hHat.z)
                                - msm_threshold;

                                if (n2 >= 0.0)
                                {
                                        GLint ix = (GLint)(n2 * msm_scale + __glHalf);
                                        spec_r = lspmm->specular.r;
                                        spec_g = lspmm->specular.g;
                                        spec_b = lspmm->specular.b;

                                        if (ix < __GL_SPEC_LOOKUP_TABLE_SIZE)
                                                n2 = msm_specTable[ix];
                                        else
                                        n2 = __glOne;

#ifdef GL_WIN_specular_fog
                                        if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                                        {
                                                fog += n2;
                                        }
#endif //GL_WIN_specular_fog

                                        rsi += n2 * spec_r;
                                        gsi += n2 * spec_g;
                                        bsi += n2 * spec_b;
                                }
                                rsi += n1 * diff_r;
                                gsi += n1 * diff_g;
                                bsi += n1 * diff_b;
                        }
                }

                pd_color_dst = &pd->colors[face];

#ifdef GL_WIN_specular_fog
                if (gc->polygon.shader.modeFlags & __GL_SHADE_SPEC_FOG)
                {
                        pd->fog = 1.0 - fog;
                        if (__GL_FLOAT_LTZ (pd->fog)) pd->fog = __glZero;
                }
#endif //GL_WIN_specular_fog


                if (notBackface)
                {
                        pd_color_dst->r = rsi;
                        pd_color_dst->g = gsi;
                        pd_color_dst->b = bsi;

                        if (__GL_COLOR_CHECK_CLAMP_RGB(gc, rsi, gsi, bsi)) {
                                __GL_CLAMP_RGB(pd_color_dst->r,
                                                pd_color_dst->g,
                                                pd_color_dst->b,
                                                gc, rsi, gsi, bsi);
                        }

                        pd_color_dst->a = msm_alpha;

                }
                else
                {
                        pd_color_dst->r = msm->cachedNonLit.r;
                        pd_color_dst->g = msm->cachedNonLit.g;
                        pd_color_dst->b = msm->cachedNonLit.b;
                        pd_color_dst->a = msm_alpha;
                }
        }
    }

}

#endif // __GL_ASM_POLYARRAYZIPPYCALCRGBCOLOR

#ifdef _X86_

// See comments in xform.asm (NORMALIZE macro) about format of this table
//
#define K 9                         // Number of used mantissa bits
#define MAX_ENTRY  (1 << (K+1))
#define EXPONENT_BIT (1 << K)
#define MANTISSA_MASK (EXPONENT_BIT - 1)
#define FRACTION_VALUE ((float)EXPONENT_BIT)

float invSqrtTable[MAX_ENTRY];      // used by glNormalizeBatch

void initInvSqrtTable()
{
    int i;
    for (i=0; i < MAX_ENTRY; i++)
    {
        if (i & EXPONENT_BIT)
            invSqrtTable[i] = (float)(1.0/sqrt(((i & MANTISSA_MASK)/FRACTION_VALUE+1.0)));
        else
            invSqrtTable[i] = (float)(1.0/sqrt(((i & MANTISSA_MASK)/FRACTION_VALUE+1.0)/2));
    }
}

/*
    __glClipCodes table has precomputed clip codes.
    Index to this table:
    bit 6  - 1 if clipW < 0
    bit 5  - 1 if clipX < 0
    bit 4  - 1 if abs(clipX) < abs(clipW)
    bit 3  - 1 if clipY < 0
    bit 2  - 1 if abs(clipY) < abs(clipW)
    bit 1  - 1 if clipZ < 0
    bit 0  - 1 if abs(clipZ) < abs(clipW)
*/
ULONG __glClipCodes[128];

void initClipCodesTable()
{
    int i, v, w;
    for (i=0; i < 128; i++)
    {
        int code = 0;
        if (i & 0x10)
        { // x < w
           v = 1; w = 2;
        }
        else
        {
           v = 2; w = 1;
        }
        if (i & 0x20) v = -v;
        if (i & 0x40) w = -w;
        if (v >  w) code|= __GL_CLIP_RIGHT;
        if (v < -w) code|= __GL_CLIP_LEFT;

        if (i & 0x04)
        { // y < w
           v = 1; w = 2;
        }
        else
        {
           v = 2; w = 1;
        }
        if (i & 0x08) v = -v;
        if (i & 0x40) w = -w;
        if (v >  w) code|= __GL_CLIP_TOP;
        if (v < -w) code|= __GL_CLIP_BOTTOM;

        if (i & 0x01)
        { // v < w
           v = 1; w = 2;
        }
        else
        {
           v = 2; w = 1;
        }
        if (i & 0x02) v = -v;
        if (i & 0x40) w = -w;
        if (v >  w) code|= __GL_CLIP_FAR;
        if (v < -w) code|= __GL_CLIP_NEAR;

        __glClipCodes[i] = code;
    }
}
#endif // _X86_

#ifndef __GL_ASM_PACLIPCHECKFRUSTUM
/****************************************************************************/
// Clip check the clip coordinates against the frustum planes.
// Compute the window coordinates if not clipped!
//
// IN:  clip
// OUT: window (if not clipped)

GLuint FASTCALL PAClipCheckFrustum(__GLcontext *gc, POLYARRAY *pa,
                                   POLYDATA *pdLast)
{
    __GLfloat x, y, z, w, invW, negW;
    GLuint code;
    POLYDATA *pd;

    for (pd = pa->pd0; pd <= pdLast; pd++)
    {

        w = pd->clip.w;
        /* Set clip codes */

        /* XXX (mf) prevent divide-by-zero */
        if (__GL_FLOAT_NEZ(w))
        {
                __GL_FLOAT_SIMPLE_BEGIN_DIVIDE(__glOne, w, invW);
        }
        else
        {
                invW = __glZero;
        }

        x = pd->clip.x;
        y = pd->clip.y;
        z = pd->clip.z;

        code = 0;
        negW = -w;

        __GL_FLOAT_SIMPLE_END_DIVIDE(invW);

        pd->window.w = invW;

        /*
        ** NOTE: it is possible for x to be less than negW and greater
            ** than w (if w is negative).  Otherwise there would be "else"
            ** clauses here.
        */
        if (x < negW) code |= __GL_CLIP_LEFT;
        if (x > w) code |= __GL_CLIP_RIGHT;
        if (y < negW) code |= __GL_CLIP_BOTTOM;
        if (y > w) code |= __GL_CLIP_TOP;
        if (z < negW) code |= __GL_CLIP_NEAR;
        if (z > w) code |= __GL_CLIP_FAR;

        /* Compute window coordinates if not clipped */
        if (!code)
        {
                __GLfloat wx, wy, wz;

                wx = x * gc->state.viewport.xScale * invW +
                    gc->state.viewport.xCenter;
                wy = y * gc->state.viewport.yScale * invW +
                    gc->state.viewport.yCenter;
                wz = z * gc->state.viewport.zScale * invW +
                    gc->state.viewport.zCenter;
                pd->window.x = wx;
                pd->window.y = wy;
                pd->window.z = wz;
        }
        pd->clipCode = code;

        pa->orClipCodes |= code;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= code;
#endif
    }
    return pa->andClipCodes;
}

GLuint FASTCALL PAClipCheckFrustumWOne(__GLcontext *gc, POLYARRAY *pa,
                                   POLYDATA *pdLast)
{
    __GLfloat x, y, z, w, invW, negW;
    GLuint code;
    POLYDATA *pd;

    for (pd = pa->pd0; pd <= pdLast; pd++)
    {

        w = pd->clip.w;
        pd->window.w = __glOne;

        /* Set clip codes */

        x = pd->clip.x;
        y = pd->clip.y;
        z = pd->clip.z;
        code = 0;
        negW = __glMinusOne;
        if (x < negW) code |= __GL_CLIP_LEFT;
        else if (x > w) code |= __GL_CLIP_RIGHT;
        if (y < negW) code |= __GL_CLIP_BOTTOM;
        else if (y > w) code |= __GL_CLIP_TOP;
        if (z < negW) code |= __GL_CLIP_NEAR;
        else if (z > w) code |= __GL_CLIP_FAR;

        /* Compute window coordinates if not clipped */
        if (!code)
        {
            __GLfloat wx, wy, wz;

                wx = x * gc->state.viewport.xScale + gc->state.viewport.xCenter;
                wy = y * gc->state.viewport.yScale + gc->state.viewport.yCenter;
                wz = z * gc->state.viewport.zScale + gc->state.viewport.zCenter;

                pd->window.x = wx;
                pd->window.y = wy;
                pd->window.z = wz;
        }
        pd->clipCode = code;
        pa->orClipCodes |= code;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= code;
#endif
    }
    return pa->andClipCodes;
}
#endif // __GL_ASM_PACLIPCHECKFRUSTUM

// Clip check the clip coordinates against the frustum planes.
// Compute the window coordinates if not clipped!
//
// IN:  clip
// OUT: window (if not clipped)

#ifndef __GL_ASM_PACLIPCHECKFRUSTUM2D
GLuint FASTCALL PAClipCheckFrustum2D(__GLcontext *gc, POLYARRAY *pa,
                                     POLYDATA *pdLast)
{
    __GLfloat x, y, z, w, negW, invW;
    GLuint code;
    POLYDATA *pd;

    for (pd = pa->pd0; pd <= pdLast; pd++) {

        /* W is 1.0 */

        pd->window.w = __glOne;

        x = pd->clip.x;
        y = pd->clip.y;
        z = pd->clip.z;
        w = pd->clip.w;
        negW = __glMinusOne;

        /* Set clip codes */
        code = 0;

        if (x < negW) code |= __GL_CLIP_LEFT;
        else if (x > w) code |= __GL_CLIP_RIGHT;
        if (y < negW) code |= __GL_CLIP_BOTTOM;
        else if (y > w) code |= __GL_CLIP_TOP;

        /* Compute window coordinates if not clipped */
        if (!code)
        {
            __GLfloat wx, wy, wz;

            wx = x * gc->state.viewport.xScale + gc->state.viewport.xCenter;
                wy = y * gc->state.viewport.yScale + gc->state.viewport.yCenter;
                wz = z * gc->state.viewport.zScale + gc->state.viewport.zCenter;
                pd->window.x = wx;
                pd->window.y = wy;
            pd->window.z = wz;
        }

        pd->clipCode = code;

        pa->orClipCodes |= code;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= code;
#endif
    }
    return pa->andClipCodes;
}
#endif // __GL_ASM_PACLIPCHECKFRUSTUM2D

// Clip check against the frustum and user clipping planes.
// Compute the window coordinates if not clipped!
//
// IN:  clip, eye
// OUT: window (if not clipped)

#ifndef __GL_ASM_PACLIPCHECKALL

GLuint FASTCALL PAClipCheckAll(__GLcontext *gc, POLYARRAY *pa,
                               POLYDATA *pdLast)
{
    __GLfloat x, y, z, w, negW, invW;
    GLuint code, bit, clipPlanesMask;
    __GLcoord *plane;
    POLYDATA *pd;

    // We need double precision to do this correctly.  If precision is
    // lowered (as it was in a previous version of this routine), triangles
    // may be clipped incorrectly with user planes (very visible in tlogo)!

    FPU_SAVE_MODE();
    FPU_ROUND_ON_PREC_HI();

    for (pd = pa->pd0; pd <= pdLast; pd++) {

        PERF_CHECK(FALSE, "Performs user plane clipping!\n");

        /*
        ** Do frustum checks.
        **
        ** NOTE: it is possible for x to be less than negW and greater than w
        ** (if w is negative).  Otherwise there would be "else" clauses here.
        */

        x = pd->clip.x;
        y = pd->clip.y;
        z = pd->clip.z;
        w = pd->clip.w;

        /* Set clip codes */

        /* XXX (mf) prevent divide-by-zero */
        if (__GL_FLOAT_NEZ(w))
        {
            __GL_FLOAT_SIMPLE_BEGIN_DIVIDE(__glOne, w, invW);
            __GL_FLOAT_SIMPLE_END_DIVIDE(invW);
        }
        else
        {
            invW = __glZero;
        }
        pd->window.w = invW;
        negW = -w;
        code = 0;
        if (x < negW) code |= __GL_CLIP_LEFT;
        if (x > w) code |= __GL_CLIP_RIGHT;
        if (y < negW) code |= __GL_CLIP_BOTTOM;
        if (y > w) code |= __GL_CLIP_TOP;
        if (z < negW) code |= __GL_CLIP_NEAR;
        if (z > w) code |= __GL_CLIP_FAR;

        /*
        ** Now do user clip plane checks
        */
        x = pd->eye.x;
        y = pd->eye.y;
        z = pd->eye.z;
        w = pd->eye.w;
        clipPlanesMask = gc->state.enables.clipPlanes;
        plane = &gc->state.transform.eyeClipPlanes[0];
        bit = __GL_CLIP_USER0;
        while (clipPlanesMask)
        {
            if (clipPlanesMask & 1)
                {
                    /*
                    ** Dot the vertex clip coordinate against the clip plane and
                    ** see if the sign is negative.  If so, then the point is out.
                    */

                    if (x * plane->x + y * plane->y + z * plane->z + w * plane->w <
                        __glZero)
                {
                    code |= bit;
                }
                }
                clipPlanesMask >>= 1;
                bit <<= 1;
                plane++;
        }

        /* Compute window coordinates if not clipped */
        if (!code)
        {
            __GLfloat wx, wy, wz;

                x = pd->clip.x;
                y = pd->clip.y;
                z = pd->clip.z;

            wx = x * gc->state.viewport.xScale * invW +
                     gc->state.viewport.xCenter;
            wy = y * gc->state.viewport.yScale * invW +
                     gc->state.viewport.yCenter;
            wz = z * gc->state.viewport.zScale * invW +
                     gc->state.viewport.zCenter;
            pd->window.x = wx;
            pd->window.y = wy;
            pd->window.z = wz;
        }

        pd->clipCode = code;

        pa->orClipCodes |= code;
#ifdef POLYARRAY_AND_CLIPCODES
        pa->andClipCodes &= code;
#endif
    }

    FPU_RESTORE_MODE();
    return pa->andClipCodes;
}

#endif // __GL_ASM_PACLIPCHECKALL

/****************************************************************************/
void APIPRIVATE __glim_EdgeFlag(GLboolean tag)
{
    __GL_SETUP();
    gc->state.current.edgeTag = tag;
}

void APIPRIVATE __glim_TexCoord4fv(const GLfloat x[4])
{
    __GL_SETUP();
    gc->state.current.texture.x = x[0];
    gc->state.current.texture.y = x[1];
    gc->state.current.texture.z = x[2];
    gc->state.current.texture.w = x[3];
}

void APIPRIVATE __glim_Normal3fv(const GLfloat v[3])
{
    __GL_SETUP();
    GLfloat x, y, z;

    x = v[0];
    y = v[1];
    z = v[2];
    gc->state.current.normal.x = x;
    gc->state.current.normal.y = y;
    gc->state.current.normal.z = z;
}

void APIPRIVATE __glim_Color4fv(const GLfloat v[4])
{
    __GL_SETUP();

    gc->state.current.userColor.r = v[0];
    gc->state.current.userColor.g = v[1];
    gc->state.current.userColor.b = v[2];
    gc->state.current.userColor.a = v[3];
    (*gc->procs.applyColor)(gc);
}

void APIPRIVATE __glim_Indexf(GLfloat c)
{
    __GL_SETUP();
    gc->state.current.userColorIndex = c;
}

#if DBG
#define DEBUG_RASTERPOS 1
#endif

// This is not very efficient but it should work fine.
void APIPRIVATE __glim_RasterPos4fv(const GLfloat v[4])
{
    POLYDATA   pd3[3];  // one pa, one pd, followed by one spare.
    POLYARRAY  *pa = (POLYARRAY *) &pd3[0];
    POLYDATA   *pd = &pd3[1];
    __GLvertex *rp;
    GLuint     oldPaNeeds, oldEnables;
#ifdef DEBUG_RASTERPOS
    void (FASTCALL *oldRenderPoint)(__GLcontext *gc, __GLvertex *v);
#endif
    GLuint     pdflags;

    __GL_SETUP_NOT_IN_BEGIN_VALIDATE();

// ASSERT_VERTEX

    if (v[3] == (GLfloat) 1.0)
    {
        if (v[2] == (GLfloat) 0.0)
            pdflags = POLYDATA_VERTEX2;
        else
            pdflags = POLYDATA_VERTEX3;
    }
    else
    {
        pdflags = POLYDATA_VERTEX4;
    }

    rp = &gc->state.current.rasterPos;

// Initialize POLYARRAY structure with one vertex

    pa->flags         = pdflags | POLYARRAY_RASTERPOS;
    pa->pdNextVertex  = pd+1;
    pa->pdCurColor    =
    pa->pdCurNormal   =
    pa->pdCurTexture  =
    pa->pdCurEdgeFlag = NULL;
    pa->pd0           = pd;
    pa->primType      = GL_POINTS;
    pa->nIndices      = 1;
    pa->aIndices      = NULL;   // identity mapping
    pa->paNext        = NULL;

    pd->flags         = pdflags;
    pd->obj           = *(__GLcoord *) &v[0];
    pd->color         = &pd->colors[__GL_FRONTFACE];
    pd->clipCode      = 1;      // set for debugging
    (pd+1)->flags     = 0;
    pa->pdLastEvalColor   =
    pa->pdLastEvalNormal  =
    pa->pdLastEvalTexture = NULL;

// Set up states.

    // need transformed texcoord in all cases
    oldPaNeeds = gc->vertex.paNeeds;
    gc->vertex.paNeeds |= PANEEDS_TEXCOORD;
    // no front-end optimization
    gc->vertex.paNeeds &= ~(PANEEDS_CLIP_ONLY | PANEEDS_SKIP_LIGHTING | PANEEDS_NORMAL);
    // set normal need
    if (gc->vertex.paNeeds & PANEEDS_RASTERPOS_NORMAL)
        gc->vertex.paNeeds |= PANEEDS_NORMAL;
    if (gc->vertex.paNeeds & PANEEDS_RASTERPOS_NORMAL_FOR_TEXTURE)
        gc->vertex.paNeeds |= PANEEDS_NORMAL_FOR_TEXTURE;

    // don't apply cheap fog!
    oldEnables = gc->state.enables.general;
    gc->state.enables.general &= ~__GL_FOG_ENABLE;

#ifdef DEBUG_RASTERPOS
// Debug only!
    // allow DrawPolyArray to perform selection but not feedback and rendering
    oldRenderPoint = gc->procs.renderPoint;
    if (gc->renderMode != GL_SELECT)
        gc->procs.renderPoint = NULL;   // was __glRenderPointNop but set to 0
                                        // for debugging
#endif

// Call DrawPolyArray to 'draw' the point.
// Begin validation has already been done.

    __glim_DrawPolyArray(pa);

// 'Render' the point in selection but not in feedback and render modes.

    if (gc->renderMode == GL_SELECT)
    {
        PARenderPoint(gc, (__GLvertex *)pa->pd0);
    }

// Eye coord should have been processed

    ASSERTOPENGL(pa->flags & POLYARRAY_EYE_PROCESSED, "need eye\n");

// Restore states.

    gc->vertex.paNeeds        = oldPaNeeds;
    gc->state.enables.general = oldEnables;
#ifdef DEBUG_RASTERPOS
    gc->procs.renderPoint     = oldRenderPoint;
#endif

// If the point is clipped, the raster position is invalid.

    if (pd->clipCode)
    {
        gc->state.current.validRasterPos = GL_FALSE;
        return;
    }
    gc->state.current.validRasterPos = GL_TRUE;

// Update raster pos data structure!
// Only the following fields are needed.

    rp->window.x = pd->window.x;
    rp->window.y = pd->window.y;
    rp->window.z = pd->window.z;
    rp->clip.w   = pd->clip.w;
    rp->eyeZ     = pd->eye.z;
    rp->colors[__GL_FRONTFACE] = pd->colors[__GL_FRONTFACE];
    rp->texture = pd->texture;
    ASSERTOPENGL(rp->color == &rp->colors[__GL_FRONTFACE],
                 "Color pointer not restored\n");
#ifdef _MCD_
    MCD_STATE_DIRTY(gc, PIXELSTATE);
#endif
}

/************************************************************************/

void FASTCALL __glNop(void) {}
void FASTCALL __glNopGC(__GLcontext* gc) {}
GLboolean FASTCALL __glNopGCBOOL(__GLcontext* gc) { return FALSE; }
void FASTCALL __glNopGCFRAG(__GLcontext* gc, __GLfragment *frag, __GLtexel *texel) {}
void FASTCALL __glNopGCCOLOR(__GLcontext* gc, __GLcolor *color, __GLtexel *texel) {}
void FASTCALL __glNopLight(__GLcontext*gc, GLint i, __GLvertex*v) {}
void FASTCALL __glNopExtract(__GLmipMapLevel *level, __GLtexture *tex,
                             GLint row, GLint col, __GLtexel *result) {}

void FASTCALL ComputeColorMaterialChange(__GLcontext *gc)
{
    gc->light.front.colorMaterialChange = 0;
    gc->light.back.colorMaterialChange  = 0;

    if (gc->modes.rgbMode
        && gc->state.enables.general & __GL_COLOR_MATERIAL_ENABLE)
    {
        GLuint colorMaterialChange;

        switch (gc->state.light.colorMaterialParam)
        {
        case GL_EMISSION:
            colorMaterialChange = __GL_MATERIAL_EMISSIVE;
            break;
        case GL_SPECULAR:
            colorMaterialChange = __GL_MATERIAL_SPECULAR;
            break;
        case GL_AMBIENT:
            colorMaterialChange = __GL_MATERIAL_AMBIENT;
            break;
        case GL_DIFFUSE:
            colorMaterialChange = __GL_MATERIAL_DIFFUSE;
            break;
        case GL_AMBIENT_AND_DIFFUSE:
            colorMaterialChange = __GL_MATERIAL_AMBIENT | __GL_MATERIAL_DIFFUSE;
            break;
        }

        if (gc->state.light.colorMaterialFace == GL_FRONT_AND_BACK
         || gc->state.light.colorMaterialFace == GL_FRONT)
            gc->light.front.colorMaterialChange = colorMaterialChange;

        if (gc->state.light.colorMaterialFace == GL_FRONT_AND_BACK
         || gc->state.light.colorMaterialFace == GL_BACK)
            gc->light.back.colorMaterialChange = colorMaterialChange;
    }
}

void FASTCALL __glGenericPickVertexProcs(__GLcontext *gc)
{
    GLuint enables = gc->state.enables.general;
    GLenum mvpMatrixType;
    __GLmatrix *m;

    m = &(gc->transform.modelView->mvp);
    mvpMatrixType = m->matrixType;

    /* Pick paClipCheck proc */
    //!!! are there better clip procs?
    if (gc->state.enables.clipPlanes)
    {
        gc->procs.paClipCheck  = PAClipCheckAll;
    }
    else
    {
        if (mvpMatrixType >= __GL_MT_IS2D &&
            m->matrix[3][2] >= -1.0f && m->matrix[3][2] <= 1.0f)
            gc->procs.paClipCheck = PAClipCheckFrustum2D;
        else
            gc->procs.paClipCheck = PAClipCheckFrustum;
    }
}

// Allocate the POLYDATA vertex buffer.
// Align the buffer on a cache line boundary

GLboolean FASTCALL PolyArrayAllocBuffer(__GLcontext *gc, GLuint nVertices)
{
    GLuint cjSize;

// Make sure that the vertex buffer holds a minimum number of vertices.

    if (nVertices < MINIMUM_POLYDATA_BUFFER_SIZE)
    {
        ASSERTOPENGL(FALSE, "vertex buffer too small\n");
        return GL_FALSE;
    }

// Allocate the vertex buffer.

    cjSize = (nVertices * sizeof(POLYDATA));

    if (!(gc->vertex.pdBuf = (POLYDATA *)GCALLOCALIGN32(gc, cjSize)))
        return GL_FALSE;

    gc->vertex.pdBufSizeBytes = cjSize;

    // Only (n-1) vertices are available for use.  The last one is reserved
    // by polyarray code.
    gc->vertex.pdBufSize = nVertices - 1;

// Initialize the vertex buffer.

    PolyArrayResetBuffer(gc);

    return GL_TRUE;
}

// Reset the color pointers in vertex buffer.
GLvoid FASTCALL PolyArrayResetBuffer(__GLcontext *gc)
{
    GLuint i;

    for (i = 0; i <= gc->vertex.pdBufSize; i++)
        gc->vertex.pdBuf[i].color = &gc->vertex.pdBuf[i].colors[__GL_FRONTFACE];
}

// Free the POLYDATA vertex buffer.
GLvoid FASTCALL PolyArrayFreeBuffer(__GLcontext *gc)
{
#ifdef _MCD_
    // If MCD, the POLYDATA vertex buffer is freed when the MCD context is
    // destroyed (see GenMcdDestroy).
    if (((__GLGENcontext *) gc)->_pMcdState)
        return;
#endif

    if (gc->vertex.pdBuf)
        GCFREEALIGN32(gc, gc->vertex.pdBuf);
    gc->vertex.pdBufSizeBytes = 0;
    gc->vertex.pdBufSize = 0;
}