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/*==========================================================================;
* * Copyright (C) 1997 Microsoft Corporation. All Rights Reserved. * * File: clip.h * Content: Template for functions to clip primitives * * The following symbol should be defined before included this file: * __PROCESS_LINE_NAME - name for a function to clip triangles * __INDEX_PRIM - name for a function to clip lines * * All these symbols are undefined at the end of this file ***************************************************************************/#ifdef __INDEX_PRIM
#define __DRAW DRAW_INDEX_PRIM
#else
#define __DRAW DRAW_PRIM
#endif
//*********************************************************************
HRESULT __PROCESS_TRI_LIST_NAME(D3DFE_PROCESSVERTICES *pv){ int vertexSize3; D3DFE_CLIPCODE *clipCode; DWORD i; HRESULT ret; BYTE *vertex; #ifdef __INDEX_PRIM
LPWORD startVertex = pv->lpwIndices; LPWORD index = pv->lpwIndices; DWORD triangleSize; // 3 for DrawPrimitives,
// 4 for ExecuteBuffers (include wFlags)
triangleSize = 3;#else
BYTE *startVertex = (BYTE*)pv->lpvOut;#endif
int primitiveCount; DWORD vertexSize; ClipVertex cv[3]; BOOL vertexTransformed; vertexTransformed = pv->dwFlags & D3DPV_TLVCLIP; clipCode = pv->lpClipFlags; vertex = (BYTE*)pv->lpvOut; vertexSize = pv->dwOutputSize; primitiveCount = 0;
vertexSize3 = vertexSize*3; for (i = pv->dwNumPrimitives; i; i--) { DWORD f1, f2, f3; // vertex clip flags
#ifdef __INDEX_PRIM
DWORD v1, v2, v3; v1 = index[0]; v2 = index[1]; v3 = index[2]; f1 = clipCode[v1]; f2 = clipCode[v2]; f3 = clipCode[v3];#else
f1 = clipCode[0]; f2 = clipCode[1]; f3 = clipCode[2];#endif
BOOL needClip = FALSE; BOOL offFrustum = FALSE; if (f1 & f2 & f3) offFrustum = TRUE; else if ((f1 | f2 | f3) & pv->dwClipMaskOffScreen) needClip = TRUE;
if (offFrustum || needClip) {// This tri does need clipping
if (primitiveCount) { // first draw the ones that didn't need clipping
DWORD vertexCount = primitiveCount*3; ret = __DRAW(pv, D3DPT_TRIANGLELIST, startVertex, vertexCount, primitiveCount); if (ret) return ret;#ifndef __INDEX_PRIM
pv->dwVertexBase += vertexCount;#endif
} // reset count and start ptr
primitiveCount = 0;#ifdef __INDEX_PRIM
startVertex = index + triangleSize;#else
pv->dwVertexBase += 3; D3D_INFO(7, "VertexBase:%08lx", pv->dwVertexBase); startVertex = vertex + vertexSize3;#endif
// now deal with the single clipped triangle
// first check if it should just be tossed or if it should be clipped
if (!offFrustum) { BYTE *p1; BYTE *p2; BYTE *p3;#ifdef __INDEX_PRIM
p1 = vertex + v1*vertexSize; p2 = vertex + v2*vertexSize; p3 = vertex + v3*vertexSize;#else
p1 = vertex; p2 = vertex + vertexSize; p3 = p2 + vertexSize;#endif
MAKE_CLIP_VERTEX_FVF(pv, cv[0], p1, f1, vertexTransformed); MAKE_CLIP_VERTEX_FVF(pv, cv[1], p2, f2, vertexTransformed); MAKE_CLIP_VERTEX_FVF(pv, cv[2], p3, f3, vertexTransformed);
#ifdef __INDEX_PRIM
#endif
ret = Clip(pv, &cv[0], &cv[1], &cv[2]); if (ret) return ret; } } else primitiveCount++;#ifdef __INDEX_PRIM
index += triangleSize;#else
clipCode += 3; vertex += vertexSize3;#endif
} // draw final batch, if any
if (primitiveCount) { ret = __DRAW(pv, D3DPT_TRIANGLELIST, startVertex, primitiveCount*3, primitiveCount); if (ret) return ret; } return D3D_OK;} //------------------------------------------------------------------------------
HRESULT __PROCESS_TRI_STRIP_NAME(D3DFE_PROCESSVERTICES *pv){ DWORD lastIndex; D3DFE_CLIPCODE *clipCode; DWORD i; HRESULT ret; BYTE *vertex; #ifdef __INDEX_PRIM
LPWORD startVertex = pv->lpwIndices; LPWORD index = pv->lpwIndices;#else
BYTE *startVertex = (BYTE*)pv->lpvOut;#endif
int primitiveCount; DWORD vertexSize; ClipVertex cv[3]; BOOL vertexTransformed; vertexTransformed = pv->dwFlags & D3DPV_TLVCLIP; clipCode = pv->lpClipFlags; vertex = (BYTE*)pv->lpvOut; vertexSize = pv->dwOutputSize; primitiveCount = 0;
lastIndex = pv->dwNumPrimitives; for (i=0; i < lastIndex; i++) { DWORD f1, f2, f3; // vertex clip flags
#ifdef __INDEX_PRIM
DWORD v1, v2, v3; v1 = index[0]; v2 = index[1]; v3 = index[2]; f1 = clipCode[v1]; f2 = clipCode[v2]; f3 = clipCode[v3];#else
f1 = clipCode[0]; f2 = clipCode[1]; f3 = clipCode[2];#endif
BOOL needClip = FALSE; BOOL offFrustum = FALSE; if (f1 & f2 & f3) offFrustum = TRUE; else if ((f1 | f2 | f3) & pv->dwClipMaskOffScreen) needClip = TRUE;
if (offFrustum || needClip) { // if this tri does need clipping
if (primitiveCount) { // first draw the ones that didn't need clipping
ret = __DRAW(pv, D3DPT_TRIANGLESTRIP, startVertex, primitiveCount+2, primitiveCount); if (ret) return ret;#ifndef __INDEX_PRIM
pv->dwVertexBase += primitiveCount;#endif
} // reset count and start ptr
primitiveCount = 0;#ifdef __INDEX_PRIM
startVertex = &index[1];#else
pv->dwVertexBase++; D3D_INFO(7, "VertexBase:%08lx", pv->dwVertexBase); startVertex = vertex + vertexSize;#endif
// now deal with the single clipped triangle
// first check if it should just be tossed or if it should be clipped
if (!offFrustum) { BYTE *p1; BYTE *p2; BYTE *p3;#ifdef __INDEX_PRIM
if (i & 1) { // For odd triangles we have to change orientation
// First vertex should remain the first, because it defines
// the color in FLAT shade mode
DWORD tmp = f2; f2 = f3; f3 = tmp; p1 = vertex + v1*vertexSize; p2 = vertex + v3*vertexSize; p3 = vertex + v2*vertexSize; } else { p1 = vertex + v1*vertexSize; p2 = vertex + v2*vertexSize; p3 = vertex + v3*vertexSize; }
#else
p1 = vertex; if (i & 1) { // For odd triangles we have to change orientation
DWORD tmp = f2; f2 = f3; f3 = tmp; p3 = vertex + vertexSize; p2 = p3 + vertexSize; } else { p2 = vertex + vertexSize; p3 = p2 + vertexSize; }#endif
MAKE_CLIP_VERTEX_FVF(pv, cv[0], p1, f1, vertexTransformed); MAKE_CLIP_VERTEX_FVF(pv, cv[1], p2, f2, vertexTransformed); MAKE_CLIP_VERTEX_FVF(pv, cv[2], p3, f3, vertexTransformed);
ret = Clip(pv, &cv[0], &cv[1], &cv[2]); if (ret) return ret; } } else { if (primitiveCount == 0 && i & 1) { // Triangle strip can not start from an odd triangle
// Because we use triangle fan, first vertex in the strip
// should be the second in the fan.
// This vertex defines the color in FLAT shading case.
BYTE tmp[__MAX_VERTEX_SIZE*3]; BYTE *p = tmp;#ifdef __INDEX_PRIM
BYTE *saveVer = (BYTE*)pv->lpvOut; DWORD numVer = pv->dwNumVertices; memcpy (p, vertex + v2*vertexSize, vertexSize); p += vertexSize; memcpy (p, vertex + v1*vertexSize, vertexSize); p += vertexSize; memcpy (p, vertex + v3*vertexSize, vertexSize);#else
memcpy(p, vertex + vertexSize, vertexSize); p += vertexSize; memcpy(p, vertex, vertexSize); p += vertexSize; memcpy(p, vertex + vertexSize + vertexSize, vertexSize);#endif
pv->dwFlags |= D3DPV_NONCLIPPED; ret = DRAW_CLIPPED_PRIM(pv, D3DPT_TRIANGLEFAN, tmp, 3, 1); pv->dwFlags &= ~D3DPV_NONCLIPPED; if (ret) return ret; primitiveCount = 0;#ifdef __INDEX_PRIM
startVertex = &index[1]; pv->lpvOut = saveVer; pv->dwNumVertices = numVer;#else
pv->dwVertexBase++; D3D_INFO(7, "VertexBase:%08lx", pv->dwVertexBase); startVertex = vertex + vertexSize;#endif
} else primitiveCount++; }#ifdef __INDEX_PRIM
index++;#else
clipCode++; vertex += vertexSize;#endif
} // draw final batch, if any
if (primitiveCount) { ret = __DRAW(pv, D3DPT_TRIANGLESTRIP, startVertex, primitiveCount+2, primitiveCount); if (ret) return ret;#ifndef __INDEX_PRIM
pv->dwVertexBase += primitiveCount;#endif
} return D3D_OK;} //-----------------------------------------------------------------------------
// The same functions is used for line lists and line strips
//
HRESULT __PROCESS_LINE_NAME(D3DFE_PROCESSVERTICES *pv){ DWORD nextLineOffset; // How many vertices to skip, when going to
// next primitive (1 for strips, 2 for lists)
DWORD countAdd; // Used to compute "real" number of vertices
// from the vertexCount
D3DPRIMITIVETYPE primType; int numPrim = 0; D3DFE_CLIPCODE *clipCode; DWORD i; HRESULT ret; BYTE *vertex; #ifdef __INDEX_PRIM
LPWORD startVertex = pv->lpwIndices; LPWORD index = pv->lpwIndices; #else
BYTE *startVertex = (BYTE*)pv->lpvOut;#endif
int vertexCount; // Primitive count for line strips,
// vertex count for line lists
DWORD vertexSize; ClipVertex cv[3]; BOOL vertexTransformed; vertexTransformed = pv->dwFlags & D3DPV_TLVCLIP; clipCode = pv->lpClipFlags; vertex = (BYTE*)pv->lpvOut; vertexSize = pv->dwOutputSize; vertexCount = 0;
primType = pv->primType; if (primType == D3DPT_LINESTRIP) { nextLineOffset = 1; countAdd = 1; } else { nextLineOffset = 2; countAdd = 0; } for (i = pv->dwNumPrimitives; i; i--) { WORD f1, f2;#ifdef __INDEX_PRIM
WORD v1, v2; v1 = index[0]; v2 = index[1]; f1 = clipCode[v1]; f2 = clipCode[v2];#else
f1 = clipCode[0]; f2 = clipCode[1];#endif
BOOL needClip = FALSE; BOOL offFrustum = FALSE; if (f1 & f2) offFrustum = TRUE; else if ((f1 | f2) & pv->dwClipMaskOffScreen) needClip = TRUE;
if (offFrustum || needClip) { // if this line does need clipping
if (vertexCount) { // first draw the ones that didn't need clipping
ret = __DRAW(pv, primType, startVertex, vertexCount+countAdd, numPrim); if (ret) return ret;#ifndef __INDEX_PRIM
pv->dwVertexBase += vertexCount;#endif
} // reset count and start ptr
vertexCount = 0; numPrim = 0;#ifdef __INDEX_PRIM
startVertex = &index[nextLineOffset];#else
pv->dwVertexBase += nextLineOffset; D3D_INFO(7, "VertexBase:%08lx", pv->dwVertexBase); startVertex = vertex + nextLineOffset*vertexSize;#endif
// now deal with the single clipped line
// first check if it should just be tossed or if it should be clipped
if (!offFrustum) {#ifdef __INDEX_PRIM
BYTE *p1 = vertex + v1*vertexSize; BYTE *p2 = vertex + v2*vertexSize;#else
BYTE *p1 = vertex; BYTE *p2 = vertex + vertexSize;#endif
MAKE_CLIP_VERTEX_FVF(pv, cv[0], p1, f1, vertexTransformed); MAKE_CLIP_VERTEX_FVF(pv, cv[1], p2, f2, vertexTransformed);
ret = ClipLine(pv, &cv[0], &cv[1]); if (ret != D3D_OK) return ret; } } else { vertexCount += nextLineOffset; numPrim++; }#ifdef __INDEX_PRIM
index += nextLineOffset;#else
vertex += nextLineOffset*vertexSize; clipCode += nextLineOffset;#endif
} // draw final batch, if any
if (vertexCount) { ret = __DRAW(pv, primType, startVertex, vertexCount+countAdd, numPrim); if (ret) return ret; } return D3D_OK;}
#undef __DRAW
#undef __INDEX_PRIM
#undef __PROCESS_LINE_NAME
#undef __PROCESS_TRI_LIST_NAME
#undef __PROCESS_TRI_STRIP_NAME
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