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925 lines
23 KiB
925 lines
23 KiB
/*
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** Copyright 1991, Silicon Graphics, Inc.
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** All Rights Reserved.
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**
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** This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.;
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** the contents of this file may not be disclosed to third parties, copied or
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** duplicated in any form, in whole or in part, without the prior written
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** permission of Silicon Graphics, Inc.
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**
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** RESTRICTED RIGHTS LEGEND:
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** Use, duplication or disclosure by the Government is subject to restrictions
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** as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data
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** and Computer Software clause at DFARS 252.227-7013, and/or in similar or
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** successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished -
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** rights reserved under the Copyright Laws of the United States.
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**
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** $Revision: 1.14 $
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** $Date: 1993/04/14 21:23:50 $
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*/
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#include "precomp.h"
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#pragma hdrstop
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void __glDoBlendSourceZERO(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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__GLfloat zero = __glZero;
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#ifdef __GL_LINT
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gc = gc;
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source = source;
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dest = dest;
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#endif
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result->r = zero;
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result->g = zero;
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result->b = zero;
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result->a = zero;
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}
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void __glDoBlendDestZERO(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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#ifdef __GL_LINT
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gc = gc;
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source = source;
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dest = dest;
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result = result;
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#endif
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/* Pretend to add zero to each component of the result.
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**
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** result->r += zero;
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** result->g += zip;
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** result->b += squat;
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** result->a += a bagel;
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*/
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}
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void __glDoBlendSourceONE(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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#ifdef __GL_LINT
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gc = gc;
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dest = dest;
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#endif
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r = source->r;
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g = source->g;
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b = source->b;
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a = source->a;
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result->r = r;
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result->g = g;
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result->b = b;
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result->a = a;
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}
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void __glDoBlendDestONE(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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#ifdef __GL_LINT
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gc = gc;
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source = source;
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#endif
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r = dest->r;
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g = dest->g;
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b = dest->b;
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a = dest->a;
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result->r += r;
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result->g += g;
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result->b += b;
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result->a += a;
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}
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void __glDoBlendDestSC(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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r = dest->r * source->r * gc->frontBuffer.oneOverRedScale;
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g = dest->g * source->g * gc->frontBuffer.oneOverGreenScale;
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b = dest->b * source->b * gc->frontBuffer.oneOverBlueScale;
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a = dest->a * source->a * gc->frontBuffer.oneOverAlphaScale;
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result->r += r;
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result->g += g;
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result->b += b;
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result->a += a;
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}
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void __glDoBlendDestMSC(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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__GLfloat one = __glOne;
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r = dest->r * (one - source->r * gc->frontBuffer.oneOverRedScale);
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g = dest->g * (one - source->g * gc->frontBuffer.oneOverGreenScale);
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b = dest->b * (one - source->b * gc->frontBuffer.oneOverBlueScale);
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a = dest->a * (one - source->a * gc->frontBuffer.oneOverAlphaScale);
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result->r += r;
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result->g += g;
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result->b += b;
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result->a += a;
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}
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void __glDoBlendSourceDC(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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r = source->r * dest->r * gc->frontBuffer.oneOverRedScale;
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g = source->g * dest->g * gc->frontBuffer.oneOverGreenScale;
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b = source->b * dest->b * gc->frontBuffer.oneOverBlueScale;
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a = source->a * dest->a * gc->frontBuffer.oneOverAlphaScale;
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result->r = r;
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result->g = g;
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result->b = b;
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result->a = a;
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}
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void __glDoBlendSourceMDC(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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__GLfloat one = __glOne;
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r = source->r * (one - dest->r * gc->frontBuffer.oneOverRedScale);
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g = source->g * (one - dest->g * gc->frontBuffer.oneOverGreenScale);
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b = source->b * (one - dest->b * gc->frontBuffer.oneOverBlueScale);
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a = source->a * (one - dest->a * gc->frontBuffer.oneOverAlphaScale);
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result->r = r;
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result->g = g;
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result->b = b;
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result->a = a;
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}
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void __glDoBlendSourceSA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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#ifdef __GL_LINT
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dest = dest;
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#endif
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a = source->a * gc->frontBuffer.oneOverAlphaScale;
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r = a * source->r;
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g = a * source->g;
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b = a * source->b;
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a = a * source->a;
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result->r = r;
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result->g = g;
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result->b = b;
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result->a = a;
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}
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void __glDoBlendDestSA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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a = source->a * gc->frontBuffer.oneOverAlphaScale;
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r = a * dest->r;
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g = a * dest->g;
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b = a * dest->b;
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a = a * dest->a;
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result->r += r;
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result->g += g;
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result->b += b;
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result->a += a;
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}
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void __glDoBlendSourceMSA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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__GLfloat msa = __glOne - source->a * gc->frontBuffer.oneOverAlphaScale;
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#ifdef __GL_LINT
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dest = dest;
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#endif
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r = msa * source->r;
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g = msa * source->g;
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b = msa * source->b;
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a = msa * source->a;
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result->r = r;
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result->g = g;
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result->b = b;
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result->a = a;
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}
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void __glDoBlendDestMSA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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__GLfloat msa =
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__glOne - source->a * gc->frontBuffer.oneOverAlphaScale;
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r = msa * dest->r;
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g = msa * dest->g;
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b = msa * dest->b;
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a = msa * dest->a;
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result->r += r;
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result->g += g;
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result->b += b;
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result->a += a;
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}
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void __glDoBlendSourceDA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b;
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__GLfloat a = dest->a * gc->frontBuffer.oneOverAlphaScale;
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r = a * source->r;
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g = a * source->g;
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b = a * source->b;
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a = a * source->a;
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result->r = r;
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result->g = g;
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result->b = b;
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result->a = a;
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}
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void __glDoBlendDestDA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b;
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__GLfloat a = dest->a * gc->frontBuffer.oneOverAlphaScale;
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#ifdef __GL_LINT
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source = source;
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#endif
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r = a * dest->r;
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g = a * dest->g;
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b = a * dest->b;
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a = a * dest->a;
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result->r += r;
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result->g += g;
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result->b += b;
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result->a += a;
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}
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void __glDoBlendSourceMDA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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__GLfloat mda;
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mda = __glOne - dest->a * gc->frontBuffer.oneOverAlphaScale;
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r = mda * source->r;
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g = mda * source->g;
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b = mda * source->b;
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a = mda * source->a;
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result->r = r;
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result->g = g;
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result->b = b;
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result->a = a;
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}
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void __glDoBlendDestMDA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b, a;
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__GLfloat mda;
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#ifdef __GL_LINT
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source = source;
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#endif
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mda = __glOne - dest->a * gc->frontBuffer.oneOverAlphaScale;
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r = mda * dest->r;
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g = mda * dest->g;
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b = mda * dest->b;
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a = mda * dest->a;
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result->r += r;
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result->g += g;
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result->b += b;
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result->a += a;
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}
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void __glDoBlendSourceSAT(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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/* Compiler hints */
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__GLfloat r, g, b;
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__GLfloat sa, mda;
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mda = __glOne - dest->a * gc->frontBuffer.oneOverAlphaScale;
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sa = source->a * gc->frontBuffer.oneOverAlphaScale;
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if (sa < mda) {
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r = sa * source->r;
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g = sa * source->g;
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b = sa * source->b;
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} else {
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r = mda * source->r;
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g = mda * source->g;
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b = mda * source->b;
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}
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result->a = source->a;
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result->r = r;
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result->g = g;
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result->b = b;
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}
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/************************************************************************/
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static void Nop(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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#ifdef __GL_LINT
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gc = gc;
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source = source;
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dest = dest;
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result = result;
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#endif
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}
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/*
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** Generic blend not handled by cases below
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*/
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static void NoFetchBlend(__GLcontext *gc, __GLcolorBuffer *cfb,
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const __GLfragment *frag, __GLcolor *result)
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{
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#ifdef __GL_LINT
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cfb = cfb;
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#endif
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(*gc->procs.blendColor)(gc, &(frag->color), NULL, result);
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}
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/*
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** Generic blend not handled by cases below
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*/
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static void FetchBlend(__GLcontext *gc, __GLcolorBuffer *cfb,
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const __GLfragment *frag, __GLcolor *result)
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{
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__GLcolor dest;
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(*cfb->fetch)(cfb, frag->x, frag->y, &dest);
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(*gc->procs.blendColor)(gc, &(frag->color), &dest, result);
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}
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void __glDoBlend(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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(*gc->procs.blendSrc)(gc, source, dest, result);
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(*gc->procs.blendDst)(gc, source, dest, result);
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if (result->r > gc->frontBuffer.redScale) {
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result->r = gc->frontBuffer.redScale;
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}
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if (result->g > gc->frontBuffer.greenScale) {
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result->g = gc->frontBuffer.greenScale;
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}
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if (result->b > gc->frontBuffer.blueScale) {
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result->b = gc->frontBuffer.blueScale;
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}
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if (result->a > gc->frontBuffer.alphaScale) {
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result->a = gc->frontBuffer.alphaScale;
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}
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}
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void __glDoBlendNoClamp(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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(*gc->procs.blendSrc)(gc, source, dest, result);
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(*gc->procs.blendDst)(gc, source, dest, result);
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}
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/*
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** Source function == SRC_ALPHA and dest function == ZERO
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*/
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void __glDoBlend_SA_ZERO(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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__GLfloat a;
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#ifdef __GL_LINT
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dest = dest;
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#endif
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a = source->a * gc->frontBuffer.oneOverAlphaScale;
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result->r = source->r * a;
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result->g = source->g * a;
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result->b = source->b * a;
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result->a = source->a * a;
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}
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/*
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** Source function == SRC_ALPHA and dest function == ONE
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*/
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void __glDoBlend_SA_ONE(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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__GLfloat a, ra, rr, rg, rb;
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a = source->a * gc->frontBuffer.oneOverAlphaScale;
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rr = dest->r + source->r * a;
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if (rr > gc->frontBuffer.redScale) {
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rr = gc->frontBuffer.redScale;
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}
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rg = dest->g + source->g * a;
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if (rg > gc->frontBuffer.greenScale) {
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rg = gc->frontBuffer.greenScale;
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}
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rb = dest->b + source->b * a;
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if (rb > gc->frontBuffer.blueScale) {
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rb = gc->frontBuffer.blueScale;
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}
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ra = dest->a + source->a * a;
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if (ra > gc->frontBuffer.alphaScale) {
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ra = gc->frontBuffer.alphaScale;
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}
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result->r = rr;
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result->g = rg;
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result->b = rb;
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result->a = ra;
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}
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/*
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** Source function == SRC_ALPHA and dest function == ONE_MINUS_SRC_ALPHA
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** No clamping is done, because the incoming colors should already be
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** in range, and the math of x a + y (1 - a) should give a result from
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** 0 to 1 if x and y are both from 0 to 1.
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*/
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void __glDoBlend_SA_MSA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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__GLfloat a, msa, rr, rg, rb, ra;
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a = source->a * gc->frontBuffer.oneOverAlphaScale;
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msa = __glOne - a;
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rr = source->r * a + dest->r * msa;
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rg = source->g * a + dest->g * msa;
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rb = source->b * a + dest->b * msa;
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ra = source->a * a + dest->a * msa;
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result->r = rr;
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result->g = rg;
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result->b = rb;
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result->a = ra;
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}
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/*
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** Source function == ONE_MINUS_SRC_ALPHA and dest function == SRC_ALPHA
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** No clamping is done, because the incoming colors should already be
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** in range, and the math of x a + y (1 - a) should give a result from
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** 0 to 1 if x and y are both from 0 to 1.
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*/
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void __glDoBlend_MSA_SA(__GLcontext *gc, const __GLcolor *source,
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const __GLcolor *dest, __GLcolor *result)
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{
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__GLfloat a, msa, rr, rg, rb, ra;
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a = source->a * gc->frontBuffer.oneOverAlphaScale;
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msa = __glOne - a;
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rr = source->r * msa + dest->r * a;
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rg = source->g * msa + dest->g * a;
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rb = source->b * msa + dest->b * a;
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ra = source->a * msa + dest->a * a;
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result->r = rr;
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result->g = rg;
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result->b = rb;
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result->a = ra;
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}
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/*
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** Source function == DST_ALPHA and dest function == ONE_MINUS_DST_ALPHA
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** No clamping is done, because the incoming colors should already be
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** in range, and the math of x a + y (1 - a) should give a result from
|
|
** 0 to 1 if x and y are both from 0 to 1.
|
|
*/
|
|
void __glDoBlend_DA_MDA(__GLcontext *gc, const __GLcolor *source,
|
|
const __GLcolor *dest, __GLcolor *result)
|
|
{
|
|
__GLfloat a, mda;
|
|
|
|
a = dest->a * gc->frontBuffer.oneOverAlphaScale;
|
|
mda = __glOne - a;
|
|
|
|
result->r = a * source->r + mda * dest->r;
|
|
result->g = a * source->g + mda * dest->g;
|
|
result->b = a * source->b + mda * dest->b;
|
|
result->a = a * source->a + mda * dest->a;
|
|
}
|
|
|
|
/*
|
|
** Source function == ONE_MINUS_DST_ALPHA and dest function == DST_ALPHA
|
|
** No clamping is done, because the incoming colors should already be
|
|
** in range, and the math of x a + y (1 - a) should give a result from
|
|
** 0 to 1 if x and y are both from 0 to 1.
|
|
*/
|
|
void __glDoBlend_MDA_DA(__GLcontext *gc, const __GLcolor *source,
|
|
const __GLcolor *dest, __GLcolor *result)
|
|
{
|
|
__GLfloat a, mda;
|
|
|
|
a = dest->a * gc->frontBuffer.oneOverAlphaScale;
|
|
mda = __glOne - a;
|
|
|
|
result->r = mda * source->r + a * dest->r;
|
|
result->g = mda * source->g + a * dest->g;
|
|
result->b = mda * source->b + a * dest->b;
|
|
result->a = mda * source->a + a * dest->a;
|
|
}
|
|
|
|
|
|
/* Generic blend span func.
|
|
*/
|
|
void FASTCALL __glBlendSpan(__GLcontext *gc)
|
|
{
|
|
__GLcolor *cp, *fcp, temp;
|
|
GLint w;
|
|
|
|
// Fetch span if required
|
|
if( gc->procs.blend == FetchBlend )
|
|
__glFetchSpan( gc );
|
|
|
|
w = gc->polygon.shader.length;
|
|
cp = gc->polygon.shader.colors;
|
|
fcp = gc->polygon.shader.fbcolors;
|
|
|
|
while (--w >= 0) {
|
|
(*gc->procs.blendColor)(gc, cp, fcp, &temp);
|
|
*cp = temp;
|
|
cp++;
|
|
fcp++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Source function == SRC_ALPHA and dest function == ONE_MINUS_SRC_ALPHA
|
|
** No clamping is done, because the incoming colors should already be
|
|
** in range, and the math of x a + y (1 - a) should give a result from
|
|
** 0 to 1 if x and y are both from 0 to 1.
|
|
*/
|
|
void FASTCALL __glBlendSpan_SA_MSA(__GLcontext *gc)
|
|
{
|
|
__GLfloat a, msa, rr, rg, rb, ra, oneOverAlpha;
|
|
__GLfloat one = __glOne;
|
|
__GLcolor *cp, *fcp;
|
|
GLint w;
|
|
|
|
__glFetchSpan( gc );
|
|
|
|
w = gc->polygon.shader.length;
|
|
cp = gc->polygon.shader.colors;
|
|
fcp = gc->polygon.shader.fbcolors;
|
|
oneOverAlpha = gc->frontBuffer.oneOverAlphaScale;
|
|
while (--w >= 0) {
|
|
a = cp->a * oneOverAlpha;
|
|
msa = one - a;
|
|
|
|
rr = cp->r * a + fcp->r * msa;
|
|
rg = cp->g * a + fcp->g * msa;
|
|
rb = cp->b * a + fcp->b * msa;
|
|
ra = cp->a * a + fcp->a * msa;
|
|
|
|
cp->r = rr;
|
|
cp->g = rg;
|
|
cp->b = rb;
|
|
cp->a = ra;
|
|
cp++;
|
|
fcp++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Source function == ONE_MINUS_SRC_ALPHA and dest function == SRC_ALPHA
|
|
** No clamping is done, because the incoming colors should already be
|
|
** in range, and the math of x a + y (1 - a) should give a result from
|
|
** 0 to 1 if x and y are both from 0 to 1.
|
|
*/
|
|
void FASTCALL __glBlendSpan_MSA_SA(__GLcontext *gc)
|
|
{
|
|
__GLfloat a, msa, rr, rg, rb, ra, oneOverAlpha;
|
|
__GLfloat one = __glOne;
|
|
__GLcolor *cp, *fcp;
|
|
GLint w;
|
|
|
|
__glFetchSpan( gc );
|
|
|
|
w = gc->polygon.shader.length;
|
|
cp = gc->polygon.shader.colors;
|
|
fcp = gc->polygon.shader.fbcolors;
|
|
oneOverAlpha = gc->frontBuffer.oneOverAlphaScale;
|
|
while (--w >= 0) {
|
|
a = cp->a * oneOverAlpha;
|
|
msa = __glOne - a;
|
|
rr = cp->r * msa + fcp->r * a;
|
|
rg = cp->g * msa + fcp->g * a;
|
|
rb = cp->b * msa + fcp->b * a;
|
|
ra = cp->a * msa + fcp->a * a;
|
|
|
|
cp->r = rr;
|
|
cp->g = rg;
|
|
cp->b = rb;
|
|
cp->a = ra;
|
|
cp++;
|
|
fcp++;
|
|
}
|
|
}
|
|
|
|
void FASTCALL __glBlendSpan_SA_ZERO(__GLcontext *gc)
|
|
{
|
|
__GLfloat a, rr, rg, rb, ra, oneOverAlpha;
|
|
__GLfloat one = __glOne;
|
|
__GLcolor *cp;
|
|
GLint w;
|
|
|
|
w = gc->polygon.shader.length;
|
|
cp = gc->polygon.shader.colors;
|
|
oneOverAlpha = gc->frontBuffer.oneOverAlphaScale;
|
|
while (--w >= 0) {
|
|
a = cp->a * oneOverAlpha;
|
|
rr = cp->r * a;
|
|
rg = cp->g * a;
|
|
rb = cp->b * a;
|
|
ra = cp->a * a;
|
|
|
|
cp->r = rr;
|
|
cp->g = rg;
|
|
cp->b = rb;
|
|
cp->a = ra;
|
|
cp++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Source function == SRC_ALPHA and dest function == ONE
|
|
** Clamping is required
|
|
*/
|
|
void FASTCALL __glBlendSpan_SA_ONE(__GLcontext *gc)
|
|
{
|
|
__GLfloat a, rr, rg, rb, ra, oneOverAlpha;
|
|
__GLfloat rs, gs, bs, as;
|
|
__GLcolor *cp, *fcp;
|
|
GLint w;
|
|
|
|
__glFetchSpan( gc );
|
|
|
|
w = gc->polygon.shader.length;
|
|
cp = gc->polygon.shader.colors;
|
|
fcp = gc->polygon.shader.fbcolors;
|
|
oneOverAlpha = gc->frontBuffer.oneOverAlphaScale;
|
|
rs = gc->frontBuffer.redScale;
|
|
gs = gc->frontBuffer.greenScale;
|
|
bs = gc->frontBuffer.blueScale;
|
|
as = gc->frontBuffer.alphaScale;
|
|
while (--w >= 0) {
|
|
a = cp->a * gc->frontBuffer.oneOverAlphaScale;
|
|
rr = fcp->r + cp->r * a;
|
|
rg = fcp->g + cp->g * a;
|
|
if (rr > rs) {
|
|
rr = rs;
|
|
}
|
|
rb = fcp->b + cp->b * a;
|
|
if (rg > gs) {
|
|
rg = gs;
|
|
}
|
|
ra = fcp->a + cp->a * a;
|
|
if (rb > bs) {
|
|
rb = bs;
|
|
}
|
|
|
|
cp->r = rr;
|
|
if (ra > as) {
|
|
ra = as;
|
|
}
|
|
cp->g = rg;
|
|
cp->b = rb;
|
|
cp->a = ra;
|
|
cp++;
|
|
fcp++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Source function == DST_ALPHA and dest function == ONE_MINUS_DST_ALPHA
|
|
** No clamping is done, because the incoming colors should already be
|
|
** in range, and the math of x a + y (1 - a) should give a result from
|
|
** 0 to 1 if x and y are both from 0 to 1.
|
|
*/
|
|
void FASTCALL __glBlendSpan_DA_MDA(__GLcontext *gc)
|
|
{
|
|
__GLfloat a, mda, oneOverAlpha;
|
|
__GLfloat one = __glOne;
|
|
__GLcolor *cp, *fcp;
|
|
GLint w;
|
|
|
|
__glFetchSpan( gc );
|
|
|
|
w = gc->polygon.shader.length;
|
|
cp = gc->polygon.shader.colors;
|
|
fcp = gc->polygon.shader.fbcolors;
|
|
oneOverAlpha = gc->frontBuffer.oneOverAlphaScale;
|
|
while (--w >= 0) {
|
|
a = fcp->a * oneOverAlpha;
|
|
mda = one - a;
|
|
|
|
cp->r = cp->r * a + fcp->r * mda;
|
|
cp->g = cp->g * a + fcp->g * mda;
|
|
cp->b = cp->b * a + fcp->b * mda;
|
|
cp->a = cp->a * a + fcp->a * mda;
|
|
|
|
cp++;
|
|
fcp++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Source function == ONE_MINUS_DST_ALPHA and dest function == DST_ALPHA
|
|
** No clamping is done, because the incoming colors should already be
|
|
** in range, and the math of x a + y (1 - a) should give a result from
|
|
** 0 to 1 if x and y are both from 0 to 1.
|
|
*/
|
|
void FASTCALL __glBlendSpan_MDA_DA(__GLcontext *gc)
|
|
{
|
|
__GLfloat a, mda, oneOverAlpha;
|
|
__GLfloat one = __glOne;
|
|
__GLcolor *cp, *fcp;
|
|
GLint w;
|
|
|
|
__glFetchSpan( gc );
|
|
|
|
w = gc->polygon.shader.length;
|
|
cp = gc->polygon.shader.colors;
|
|
fcp = gc->polygon.shader.fbcolors;
|
|
oneOverAlpha = gc->frontBuffer.oneOverAlphaScale;
|
|
while (--w >= 0) {
|
|
a = fcp->a * oneOverAlpha;
|
|
mda = one - a;
|
|
|
|
cp->r = cp->r * mda + fcp->r * a;
|
|
cp->g = cp->g * mda + fcp->g * a;
|
|
cp->b = cp->b * mda + fcp->b * a;
|
|
cp->a = cp->a * mda + fcp->a * a;
|
|
|
|
cp++;
|
|
fcp++;
|
|
}
|
|
}
|
|
|
|
/************************************************************************/
|
|
|
|
void FASTCALL __glGenericPickBlendProcs(__GLcontext *gc)
|
|
{
|
|
GLenum s = gc->state.raster.blendSrc;
|
|
GLenum d = gc->state.raster.blendDst;
|
|
|
|
if (gc->modes.colorIndexMode) {
|
|
return;
|
|
}
|
|
/* Does the blending function need to fetch the dst color? */
|
|
gc->procs.blendSpan = __glBlendSpan;
|
|
if (d == GL_ZERO && s != GL_DST_COLOR && s != GL_ONE_MINUS_DST_COLOR &&
|
|
s != GL_DST_ALPHA && s != GL_ONE_MINUS_DST_ALPHA &&
|
|
s != GL_SRC_ALPHA_SATURATE) {
|
|
gc->procs.blend = NoFetchBlend;
|
|
} else {
|
|
gc->procs.blend = FetchBlend;
|
|
}
|
|
if (!(gc->state.enables.general & __GL_BLEND_ENABLE)) {
|
|
gc->procs.blendColor = Nop;
|
|
} else {
|
|
/* Look for any fast paths */
|
|
if (s == GL_SRC_ALPHA) {
|
|
if (d == GL_ZERO) {
|
|
gc->procs.blendColor = __glDoBlend_SA_ZERO;
|
|
gc->procs.blendSpan = __glBlendSpan_SA_ZERO;
|
|
return;
|
|
}
|
|
if (d == GL_ONE) {
|
|
gc->procs.blendColor = __glDoBlend_SA_ONE;
|
|
gc->procs.blendSpan = __glBlendSpan_SA_ONE;
|
|
return;
|
|
}
|
|
if (d == GL_ONE_MINUS_SRC_ALPHA) {
|
|
gc->procs.blendColor = __glDoBlend_SA_MSA;
|
|
gc->procs.blendSpan = __glBlendSpan_SA_MSA;
|
|
return;
|
|
}
|
|
}
|
|
else if (s == GL_ONE_MINUS_SRC_ALPHA) {
|
|
if (d == GL_SRC_ALPHA) {
|
|
gc->procs.blendColor = __glDoBlend_MSA_SA;
|
|
gc->procs.blendSpan = __glBlendSpan_MSA_SA;
|
|
return;
|
|
}
|
|
}
|
|
else if (s == GL_DST_ALPHA) {
|
|
if (d == GL_ONE_MINUS_DST_ALPHA) {
|
|
gc->procs.blendColor = __glDoBlend_DA_MDA;
|
|
gc->procs.blendSpan = __glBlendSpan_DA_MDA;
|
|
return;
|
|
}
|
|
}
|
|
else if (s == GL_ONE_MINUS_DST_ALPHA) {
|
|
if (d == GL_DST_ALPHA) {
|
|
gc->procs.blendColor = __glDoBlend_MDA_DA;
|
|
gc->procs.blendSpan = __glBlendSpan_MDA_DA;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Use generic blend function */
|
|
if ( (d == GL_ONE_MINUS_SRC_COLOR) ||
|
|
(s == GL_ONE_MINUS_DST_COLOR) ||
|
|
(d == GL_ZERO) ||
|
|
(s == GL_ZERO)) {
|
|
gc->procs.blendColor = __glDoBlendNoClamp;
|
|
} else {
|
|
gc->procs.blendColor = __glDoBlend;
|
|
}
|
|
switch (s) {
|
|
case GL_ZERO:
|
|
gc->procs.blendSrc = __glDoBlendSourceZERO;
|
|
break;
|
|
case GL_ONE:
|
|
gc->procs.blendSrc = __glDoBlendSourceONE;
|
|
break;
|
|
case GL_DST_COLOR:
|
|
gc->procs.blendSrc = __glDoBlendSourceDC;
|
|
break;
|
|
case GL_ONE_MINUS_DST_COLOR:
|
|
gc->procs.blendSrc = __glDoBlendSourceMDC;
|
|
break;
|
|
case GL_SRC_ALPHA:
|
|
gc->procs.blendSrc = __glDoBlendSourceSA;
|
|
break;
|
|
case GL_ONE_MINUS_SRC_ALPHA:
|
|
gc->procs.blendSrc = __glDoBlendSourceMSA;
|
|
break;
|
|
case GL_DST_ALPHA:
|
|
gc->procs.blendSrc = __glDoBlendSourceDA;
|
|
break;
|
|
case GL_ONE_MINUS_DST_ALPHA:
|
|
gc->procs.blendSrc = __glDoBlendSourceMDA;
|
|
break;
|
|
case GL_SRC_ALPHA_SATURATE:
|
|
gc->procs.blendSrc = __glDoBlendSourceSAT;
|
|
break;
|
|
}
|
|
switch (d) {
|
|
case GL_ZERO:
|
|
gc->procs.blendDst = __glDoBlendDestZERO;
|
|
break;
|
|
case GL_ONE:
|
|
gc->procs.blendDst = __glDoBlendDestONE;
|
|
break;
|
|
case GL_SRC_COLOR:
|
|
gc->procs.blendDst = __glDoBlendDestSC;
|
|
break;
|
|
case GL_ONE_MINUS_SRC_COLOR:
|
|
gc->procs.blendDst = __glDoBlendDestMSC;
|
|
break;
|
|
case GL_SRC_ALPHA:
|
|
gc->procs.blendDst = __glDoBlendDestSA;
|
|
break;
|
|
case GL_ONE_MINUS_SRC_ALPHA:
|
|
gc->procs.blendDst = __glDoBlendDestMSA;
|
|
break;
|
|
case GL_DST_ALPHA:
|
|
gc->procs.blendDst = __glDoBlendDestDA;
|
|
break;
|
|
case GL_ONE_MINUS_DST_ALPHA:
|
|
gc->procs.blendDst = __glDoBlendDestMDA;
|
|
break;
|
|
}
|
|
}
|
|
}
|