xserver and mesa git update 28-12-2010

1 files changed, 1014 insertions, 1002 deletions

diff --git a/mesalib/src/mesa/swrast/s_blend.c b/mesalib/src/mesa/swrast/s_blend.c
index 5b090c72c..d2684b79e 100644
--- a/mesalib/src/mesa/swrast/s_blend.c
+++ b/mesalib/src/mesa/swrast/s_blend.c
@@ -1,1002 +1,1014 @@
-/*
- * Mesa 3-D graphics library
- * Version:  7.1
- *
- * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-/**
- * \file swrast/s_blend.c
- * \brief software blending.
- * \author Brian Paul
- *
- * Only a few blend modes have been optimized (min, max, transparency, add)
- * more optimized cases can easily be added if needed.
- * Celestia uses glBlendFunc(GL_SRC_ALPHA, GL_ONE), for example.
- */
-
-
-
-#include "main/glheader.h"
-#include "main/context.h"
-#include "main/colormac.h"
-#include "main/macros.h"
-
-#include "s_blend.h"
-#include "s_context.h"
-#include "s_span.h"
-
-
-#if defined(USE_MMX_ASM)
-#include "x86/mmx.h"
-#include "x86/common_x86_asm.h"
-#define _BLENDAPI _ASMAPI
-#else
-#define _BLENDAPI
-#endif
-
-
-/**
- * Integer divide by 255
- * Declare "int divtemp" before using.
- * This satisfies Glean and should be reasonably fast.
- * Contributed by Nathan Hand.
- */
-#define DIV255(X)  (divtemp = (X), ((divtemp << 8) + divtemp + 256) >> 16)
-
-
-
-/**
- * Special case for glBlendFunc(GL_ZERO, GL_ONE).
- * No-op means the framebuffer values remain unchanged.
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_noop(GLcontext *ctx, GLuint n, const GLubyte mask[],
-           GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
-   GLint bytes;
-
-   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendSrcRGB == GL_ZERO);
-   ASSERT(ctx->Color.BlendDstRGB == GL_ONE);
-   (void) ctx;
-
-   /* just memcpy */
-   if (chanType == GL_UNSIGNED_BYTE)
-      bytes = 4 * n * sizeof(GLubyte);
-   else if (chanType == GL_UNSIGNED_SHORT)
-      bytes = 4 * n * sizeof(GLushort);
-   else
-      bytes = 4 * n * sizeof(GLfloat);
-
-   memcpy(src, dst, bytes);
-}
-
-
-/**
- * Special case for glBlendFunc(GL_ONE, GL_ZERO)
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_replace(GLcontext *ctx, GLuint n, const GLubyte mask[],
-              GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
-   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendSrcRGB == GL_ONE);
-   ASSERT(ctx->Color.BlendDstRGB == GL_ZERO);
-   (void) ctx;
-   (void) n;
-   (void) mask;
-   (void) src;
-   (void) dst;
-}
-
-
-/**
- * Common transparency blending mode:
- * glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA).
- */
-static void _BLENDAPI
-blend_transparency_ubyte(GLcontext *ctx, GLuint n, const GLubyte mask[],
-                         GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
-   GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
-   const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
-   GLuint i;
-
-   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendSrcRGB == GL_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendSrcA == GL_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendDstRGB == GL_ONE_MINUS_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendDstA == GL_ONE_MINUS_SRC_ALPHA);
-   ASSERT(chanType == GL_UNSIGNED_BYTE);
-
-   (void) ctx;
-
-   for (i = 0; i < n; i++) {
-      if (mask[i]) {
-         const GLint t = rgba[i][ACOMP];  /* t is in [0, 255] */
-         if (t == 0) {
-            /* 0% alpha */
-            COPY_4UBV(rgba[i], dest[i]);
-         }
-         else if (t != 255) {
-	    GLint divtemp;
-            const GLint r = DIV255((rgba[i][RCOMP] - dest[i][RCOMP]) * t) + dest[i][RCOMP];
-            const GLint g = DIV255((rgba[i][GCOMP] - dest[i][GCOMP]) * t) + dest[i][GCOMP];
-            const GLint b = DIV255((rgba[i][BCOMP] - dest[i][BCOMP]) * t) + dest[i][BCOMP];
-            const GLint a = DIV255((rgba[i][ACOMP] - dest[i][ACOMP]) * t) + dest[i][ACOMP]; 
-            ASSERT(r <= 255);
-            ASSERT(g <= 255);
-            ASSERT(b <= 255);
-            ASSERT(a <= 255);
-            rgba[i][RCOMP] = (GLubyte) r;
-            rgba[i][GCOMP] = (GLubyte) g;
-            rgba[i][BCOMP] = (GLubyte) b;
-            rgba[i][ACOMP] = (GLubyte) a;
-         }
-      }
-   }
-}
-
-
-static void _BLENDAPI
-blend_transparency_ushort(GLcontext *ctx, GLuint n, const GLubyte mask[],
-                          GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
-   GLushort (*rgba)[4] = (GLushort (*)[4]) src;
-   const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
-   GLuint i;
-
-   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendSrcRGB == GL_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendSrcA == GL_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendDstRGB == GL_ONE_MINUS_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendDstA == GL_ONE_MINUS_SRC_ALPHA);
-   ASSERT(chanType == GL_UNSIGNED_SHORT);
-
-   (void) ctx;
-
-   for (i = 0; i < n; i++) {
-      if (mask[i]) {
-         const GLint t = rgba[i][ACOMP];
-         if (t == 0) {
-            /* 0% alpha */
-            COPY_4V(rgba[i], dest[i]);
-         }
-         else if (t != 65535) {
-            const GLfloat tt = (GLfloat) t / 65535.0F;
-            GLushort r = (GLushort) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]);
-            GLushort g = (GLushort) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]);
-            GLushort b = (GLushort) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]);
-            GLushort a = (GLushort) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]);
-            ASSIGN_4V(rgba[i], r, g, b, a);
-         }
-      }
-   }
-}
-
-
-static void _BLENDAPI
-blend_transparency_float(GLcontext *ctx, GLuint n, const GLubyte mask[],
-                         GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
-   GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
-   const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
-   GLuint i;
-
-   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendSrcRGB == GL_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendSrcA == GL_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendDstRGB == GL_ONE_MINUS_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendDstA == GL_ONE_MINUS_SRC_ALPHA);
-   ASSERT(chanType == GL_FLOAT);
-
-   (void) ctx;
-
-   for (i = 0; i < n; i++) {
-      if (mask[i]) {
-         const GLfloat t = rgba[i][ACOMP];  /* t in [0, 1] */
-         if (t == 0.0F) {
-            /* 0% alpha */
-            COPY_4V(rgba[i], dest[i]);
-         }
-         else if (t != 1.0F) {
-            GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * t + dest[i][RCOMP];
-            GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * t + dest[i][GCOMP];
-            GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * t + dest[i][BCOMP];
-            GLfloat a = (rgba[i][ACOMP] - dest[i][ACOMP]) * t + dest[i][ACOMP];
-            ASSIGN_4V(rgba[i], r, g, b, a);
-         }
-      }
-   }
-}
-
-
-
-/**
- * Add src and dest: glBlendFunc(GL_ONE, GL_ONE).
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_add(GLcontext *ctx, GLuint n, const GLubyte mask[],
-          GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
-   GLuint i;
-
-   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);
-   ASSERT(ctx->Color.BlendSrcRGB == GL_ONE);
-   ASSERT(ctx->Color.BlendDstRGB == GL_ONE);
-   (void) ctx;
-
-   if (chanType == GL_UNSIGNED_BYTE) {
-      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
-      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            GLint r = rgba[i][RCOMP] + dest[i][RCOMP];
-            GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
-            GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
-            GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
-            rgba[i][RCOMP] = (GLubyte) MIN2( r, 255 );
-            rgba[i][GCOMP] = (GLubyte) MIN2( g, 255 );
-            rgba[i][BCOMP] = (GLubyte) MIN2( b, 255 );
-            rgba[i][ACOMP] = (GLubyte) MIN2( a, 255 );
-         }
-      }
-   }
-   else if (chanType == GL_UNSIGNED_SHORT) {
-      GLushort (*rgba)[4] = (GLushort (*)[4]) src;
-      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            GLint r = rgba[i][RCOMP] + dest[i][RCOMP];
-            GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
-            GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
-            GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
-            rgba[i][RCOMP] = (GLshort) MIN2( r, 255 );
-            rgba[i][GCOMP] = (GLshort) MIN2( g, 255 );
-            rgba[i][BCOMP] = (GLshort) MIN2( b, 255 );
-            rgba[i][ACOMP] = (GLshort) MIN2( a, 255 );
-         }
-      }
-   }
-   else {
-      GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
-      const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
-      ASSERT(chanType == GL_FLOAT);
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            /* don't RGB clamp to max */
-            rgba[i][RCOMP] += dest[i][RCOMP];
-            rgba[i][GCOMP] += dest[i][GCOMP];
-            rgba[i][BCOMP] += dest[i][BCOMP];
-            rgba[i][ACOMP] += dest[i][ACOMP];
-         }
-      }
-   }
-}
-
-
-
-/**
- * Blend min function.
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_min(GLcontext *ctx, GLuint n, const GLubyte mask[],
-          GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
-   GLuint i;
-   ASSERT(ctx->Color.BlendEquationRGB == GL_MIN);
-   ASSERT(ctx->Color.BlendEquationA == GL_MIN);
-   (void) ctx;
-
-   if (chanType == GL_UNSIGNED_BYTE) {
-      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
-      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
-            rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
-            rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
-            rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
-         }
-      }
-   }
-   else if (chanType == GL_UNSIGNED_SHORT) {
-      GLushort (*rgba)[4] = (GLushort (*)[4]) src;
-      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
-            rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
-            rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
-            rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
-         }
-      }
-   }
-   else {
-      GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
-      const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
-      ASSERT(chanType == GL_FLOAT);
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
-            rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
-            rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
-            rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
-         }
-      }
-   }
-}
-
-
-/**
- * Blend max function.
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_max(GLcontext *ctx, GLuint n, const GLubyte mask[],
-          GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
-   GLuint i;
-   ASSERT(ctx->Color.BlendEquationRGB == GL_MAX);
-   ASSERT(ctx->Color.BlendEquationA == GL_MAX);
-   (void) ctx;
-
-   if (chanType == GL_UNSIGNED_BYTE) {
-      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
-      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
-            rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
-            rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
-            rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
-         }
-      }
-   }
-   else if (chanType == GL_UNSIGNED_SHORT) {
-      GLushort (*rgba)[4] = (GLushort (*)[4]) src;
-      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
-            rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
-            rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
-            rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
-         }
-      }
-   }
-   else {
-      GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
-      const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
-      ASSERT(chanType == GL_FLOAT);
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
-            rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
-            rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
-            rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
-         }
-      }
-   }
-}
-
-
-
-/**
- * Modulate:  result = src * dest
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_modulate(GLcontext *ctx, GLuint n, const GLubyte mask[],
-               GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
-   GLuint i;
-   (void) ctx;
-
-   if (chanType == GL_UNSIGNED_BYTE) {
-      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
-      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-	    GLint divtemp;
-            rgba[i][RCOMP] = DIV255(rgba[i][RCOMP] * dest[i][RCOMP]);
-            rgba[i][GCOMP] = DIV255(rgba[i][GCOMP] * dest[i][GCOMP]);
-            rgba[i][BCOMP] = DIV255(rgba[i][BCOMP] * dest[i][BCOMP]);
-            rgba[i][ACOMP] = DIV255(rgba[i][ACOMP] * dest[i][ACOMP]);
-         }
-      }
-   }
-   else if (chanType == GL_UNSIGNED_SHORT) {
-      GLushort (*rgba)[4] = (GLushort (*)[4]) src;
-      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            rgba[i][RCOMP] = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16;
-            rgba[i][GCOMP] = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16;
-            rgba[i][BCOMP] = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16;
-            rgba[i][ACOMP] = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16;
-         }
-      }
-   }
-   else {
-      GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
-      const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
-      ASSERT(chanType == GL_FLOAT);
-      for (i=0;i<n;i++) {
-         if (mask[i]) {
-            rgba[i][RCOMP] = rgba[i][RCOMP] * dest[i][RCOMP];
-            rgba[i][GCOMP] = rgba[i][GCOMP] * dest[i][GCOMP];
-            rgba[i][BCOMP] = rgba[i][BCOMP] * dest[i][BCOMP];
-            rgba[i][ACOMP] = rgba[i][ACOMP] * dest[i][ACOMP];
-         }
-      }
-   }
-}
-
-
-/**
- * Do any blending operation, using floating point.
- * \param n  number of pixels
- * \param mask  fragment writemask array
- * \param rgba  array of incoming (and modified) pixels
- * \param dest  array of pixels from the dest color buffer
- */
-static void
-blend_general_float(GLcontext *ctx, GLuint n, const GLubyte mask[],
-                    GLfloat rgba[][4], GLfloat dest[][4],
-                    GLenum chanType)
-{
-   GLuint i;
-
-   for (i = 0; i < n; i++) {
-      if (mask[i]) {
-         /* Incoming/source Color */
-         const GLfloat Rs = rgba[i][RCOMP];
-         const GLfloat Gs = rgba[i][GCOMP];
-         const GLfloat Bs = rgba[i][BCOMP];
-         const GLfloat As = rgba[i][ACOMP];
-
-         /* Frame buffer/dest color */
-         const GLfloat Rd = dest[i][RCOMP];
-         const GLfloat Gd = dest[i][GCOMP];
-         const GLfloat Bd = dest[i][BCOMP];
-         const GLfloat Ad = dest[i][ACOMP];
-
-         GLfloat sR, sG, sB, sA;  /* Source factor */
-         GLfloat dR, dG, dB, dA;  /* Dest factor */
-         GLfloat r, g, b, a;      /* result color */
-
-         /* XXX for the case of constant blend terms we could init
-          * the sX and dX variables just once before the loop.
-          */
-
-         /* Source RGB factor */
-         switch (ctx->Color.BlendSrcRGB) {
-            case GL_ZERO:
-               sR = sG = sB = 0.0F;
-               break;
-            case GL_ONE:
-               sR = sG = sB = 1.0F;
-               break;
-            case GL_DST_COLOR:
-               sR = Rd;
-               sG = Gd;
-               sB = Bd;
-               break;
-            case GL_ONE_MINUS_DST_COLOR:
-               sR = 1.0F - Rd;
-               sG = 1.0F - Gd;
-               sB = 1.0F - Bd;
-               break;
-            case GL_SRC_ALPHA:
-               sR = sG = sB = As;
-               break;
-            case GL_ONE_MINUS_SRC_ALPHA:
-               sR = sG = sB = 1.0F - As;
-               break;
-            case GL_DST_ALPHA:
-               sR = sG = sB = Ad;
-               break;
-            case GL_ONE_MINUS_DST_ALPHA:
-               sR = sG = sB = 1.0F - Ad;
-               break;
-            case GL_SRC_ALPHA_SATURATE:
-               if (As < 1.0F - Ad) {
-                  sR = sG = sB = As;
-               }
-               else {
-                  sR = sG = sB = 1.0F - Ad;
-               }
-               break;
-            case GL_CONSTANT_COLOR:
-               sR = ctx->Color.BlendColor[0];
-               sG = ctx->Color.BlendColor[1];
-               sB = ctx->Color.BlendColor[2];
-               break;
-            case GL_ONE_MINUS_CONSTANT_COLOR:
-               sR = 1.0F - ctx->Color.BlendColor[0];
-               sG = 1.0F - ctx->Color.BlendColor[1];
-               sB = 1.0F - ctx->Color.BlendColor[2];
-               break;
-            case GL_CONSTANT_ALPHA:
-               sR = sG = sB = ctx->Color.BlendColor[3];
-               break;
-            case GL_ONE_MINUS_CONSTANT_ALPHA:
-               sR = sG = sB = 1.0F - ctx->Color.BlendColor[3];
-               break;
-            case GL_SRC_COLOR:
-               sR = Rs;
-               sG = Gs;
-               sB = Bs;
-               break;
-            case GL_ONE_MINUS_SRC_COLOR:
-               sR = 1.0F - Rs;
-               sG = 1.0F - Gs;
-               sB = 1.0F - Bs;
-               break;
-            default:
-               /* this should never happen */
-               _mesa_problem(ctx, "Bad blend source RGB factor in blend_general_float");
-               return;
-         }
-
-         /* Source Alpha factor */
-         switch (ctx->Color.BlendSrcA) {
-            case GL_ZERO:
-               sA = 0.0F;
-               break;
-            case GL_ONE:
-               sA = 1.0F;
-               break;
-            case GL_DST_COLOR:
-               sA = Ad;
-               break;
-            case GL_ONE_MINUS_DST_COLOR:
-               sA = 1.0F - Ad;
-               break;
-            case GL_SRC_ALPHA:
-               sA = As;
-               break;
-            case GL_ONE_MINUS_SRC_ALPHA:
-               sA = 1.0F - As;
-               break;
-            case GL_DST_ALPHA:
-               sA = Ad;
-               break;
-            case GL_ONE_MINUS_DST_ALPHA:
-               sA = 1.0F - Ad;
-               break;
-            case GL_SRC_ALPHA_SATURATE:
-               sA = 1.0;
-               break;
-            case GL_CONSTANT_COLOR:
-               sA = ctx->Color.BlendColor[3];
-               break;
-            case GL_ONE_MINUS_CONSTANT_COLOR:
-               sA = 1.0F - ctx->Color.BlendColor[3];
-               break;
-            case GL_CONSTANT_ALPHA:
-               sA = ctx->Color.BlendColor[3];
-               break;
-            case GL_ONE_MINUS_CONSTANT_ALPHA:
-               sA = 1.0F - ctx->Color.BlendColor[3];
-               break;
-            case GL_SRC_COLOR:
-               sA = As;
-               break;
-            case GL_ONE_MINUS_SRC_COLOR:
-               sA = 1.0F - As;
-               break;
-            default:
-               /* this should never happen */
-               sA = 0.0F;
-               _mesa_problem(ctx, "Bad blend source A factor in blend_general_float");
-               return;
-         }
-
-         /* Dest RGB factor */
-         switch (ctx->Color.BlendDstRGB) {
-            case GL_ZERO:
-               dR = dG = dB = 0.0F;
-               break;
-            case GL_ONE:
-               dR = dG = dB = 1.0F;
-               break;
-            case GL_SRC_COLOR:
-               dR = Rs;
-               dG = Gs;
-               dB = Bs;
-               break;
-            case GL_ONE_MINUS_SRC_COLOR:
-               dR = 1.0F - Rs;
-               dG = 1.0F - Gs;
-               dB = 1.0F - Bs;
-               break;
-            case GL_SRC_ALPHA:
-               dR = dG = dB = As;
-               break;
-            case GL_ONE_MINUS_SRC_ALPHA:
-               dR = dG = dB = 1.0F - As;
-               break;
-            case GL_DST_ALPHA:
-               dR = dG = dB = Ad;
-               break;
-            case GL_ONE_MINUS_DST_ALPHA:
-               dR = dG = dB = 1.0F - Ad;
-               break;
-            case GL_CONSTANT_COLOR:
-               dR = ctx->Color.BlendColor[0];
-               dG = ctx->Color.BlendColor[1];
-               dB = ctx->Color.BlendColor[2];
-               break;
-            case GL_ONE_MINUS_CONSTANT_COLOR:
-               dR = 1.0F - ctx->Color.BlendColor[0];
-               dG = 1.0F - ctx->Color.BlendColor[1];
-               dB = 1.0F - ctx->Color.BlendColor[2];
-               break;
-            case GL_CONSTANT_ALPHA:
-               dR = dG = dB = ctx->Color.BlendColor[3];
-               break;
-            case GL_ONE_MINUS_CONSTANT_ALPHA:
-               dR = dG = dB = 1.0F - ctx->Color.BlendColor[3];
-               break;
-            case GL_DST_COLOR:
-               dR = Rd;
-               dG = Gd;
-               dB = Bd;
-               break;
-            case GL_ONE_MINUS_DST_COLOR:
-               dR = 1.0F - Rd;
-               dG = 1.0F - Gd;
-               dB = 1.0F - Bd;
-               break;
-            default:
-               /* this should never happen */
-               dR = dG = dB = 0.0F;
-               _mesa_problem(ctx, "Bad blend dest RGB factor in blend_general_float");
-               return;
-         }
-
-         /* Dest Alpha factor */
-         switch (ctx->Color.BlendDstA) {
-            case GL_ZERO:
-               dA = 0.0F;
-               break;
-            case GL_ONE:
-               dA = 1.0F;
-               break;
-            case GL_SRC_COLOR:
-               dA = As;
-               break;
-            case GL_ONE_MINUS_SRC_COLOR:
-               dA = 1.0F - As;
-               break;
-            case GL_SRC_ALPHA:
-               dA = As;
-               break;
-            case GL_ONE_MINUS_SRC_ALPHA:
-               dA = 1.0F - As;
-               break;
-            case GL_DST_ALPHA:
-               dA = Ad;
-               break;
-            case GL_ONE_MINUS_DST_ALPHA:
-               dA = 1.0F - Ad;
-               break;
-            case GL_CONSTANT_COLOR:
-               dA = ctx->Color.BlendColor[3];
-               break;
-            case GL_ONE_MINUS_CONSTANT_COLOR:
-               dA = 1.0F - ctx->Color.BlendColor[3];
-               break;
-            case GL_CONSTANT_ALPHA:
-               dA = ctx->Color.BlendColor[3];
-               break;
-            case GL_ONE_MINUS_CONSTANT_ALPHA:
-               dA = 1.0F - ctx->Color.BlendColor[3];
-               break;
-            case GL_DST_COLOR:
-               dA = Ad;
-               break;
-            case GL_ONE_MINUS_DST_COLOR:
-               dA = 1.0F - Ad;
-               break;
-            default:
-               /* this should never happen */
-               dA = 0.0F;
-               _mesa_problem(ctx, "Bad blend dest A factor in blend_general_float");
-               return;
-         }
-
-         /* compute the blended RGB */
-         switch (ctx->Color.BlendEquationRGB) {
-         case GL_FUNC_ADD:
-            r = Rs * sR + Rd * dR;
-            g = Gs * sG + Gd * dG;
-            b = Bs * sB + Bd * dB;
-            a = As * sA + Ad * dA;
-            break;
-         case GL_FUNC_SUBTRACT:
-            r = Rs * sR - Rd * dR;
-            g = Gs * sG - Gd * dG;
-            b = Bs * sB - Bd * dB;
-            a = As * sA - Ad * dA;
-            break;
-         case GL_FUNC_REVERSE_SUBTRACT:
-            r = Rd * dR - Rs * sR;
-            g = Gd * dG - Gs * sG;
-            b = Bd * dB - Bs * sB;
-            a = Ad * dA - As * sA;
-            break;
-         case GL_MIN:
-	    r = MIN2( Rd, Rs );
-	    g = MIN2( Gd, Gs );
-	    b = MIN2( Bd, Bs );
-            break;
-         case GL_MAX:
-	    r = MAX2( Rd, Rs );
-	    g = MAX2( Gd, Gs );
-	    b = MAX2( Bd, Bs );
-            break;
-	 default:
-            /* should never get here */
-            r = g = b = 0.0F;  /* silence uninitialized var warning */
-            _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
-            return;
-         }
-
-         /* compute the blended alpha */
-         switch (ctx->Color.BlendEquationA) {
-         case GL_FUNC_ADD:
-            a = As * sA + Ad * dA;
-            break;
-         case GL_FUNC_SUBTRACT:
-            a = As * sA - Ad * dA;
-            break;
-         case GL_FUNC_REVERSE_SUBTRACT:
-            a = Ad * dA - As * sA;
-            break;
-         case GL_MIN:
-	    a = MIN2( Ad, As );
-            break;
-         case GL_MAX:
-	    a = MAX2( Ad, As );
-            break;
-         default:
-            /* should never get here */
-            a = 0.0F;  /* silence uninitialized var warning */
-            _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
-            return;
-         }
-
-         /* final clamping */
-#if 0
-         rgba[i][RCOMP] = MAX2( r, 0.0F );
-         rgba[i][GCOMP] = MAX2( g, 0.0F );
-         rgba[i][BCOMP] = MAX2( b, 0.0F );
-         rgba[i][ACOMP] = CLAMP( a, 0.0F, 1.0F );
-#else
-         ASSIGN_4V(rgba[i], r, g, b, a);
-#endif
-      }
-   }
-}
-
-
-/**
- * Do any blending operation, any chanType.
- */
-static void
-blend_general(GLcontext *ctx, GLuint n, const GLubyte mask[],
-              void *src, const void *dst, GLenum chanType)
-{
-   GLfloat rgbaF[MAX_WIDTH][4], destF[MAX_WIDTH][4];
-
-   if (chanType == GL_UNSIGNED_BYTE) {
-      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
-      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
-      GLuint i;
-      /* convert ubytes to floats */
-      for (i = 0; i < n; i++) {
-         if (mask[i]) {
-            rgbaF[i][RCOMP] = UBYTE_TO_FLOAT(rgba[i][RCOMP]);
-            rgbaF[i][GCOMP] = UBYTE_TO_FLOAT(rgba[i][GCOMP]);
-            rgbaF[i][BCOMP] = UBYTE_TO_FLOAT(rgba[i][BCOMP]);
-            rgbaF[i][ACOMP] = UBYTE_TO_FLOAT(rgba[i][ACOMP]);
-            destF[i][RCOMP] = UBYTE_TO_FLOAT(dest[i][RCOMP]);
-            destF[i][GCOMP] = UBYTE_TO_FLOAT(dest[i][GCOMP]);
-            destF[i][BCOMP] = UBYTE_TO_FLOAT(dest[i][BCOMP]);
-            destF[i][ACOMP] = UBYTE_TO_FLOAT(dest[i][ACOMP]);
-         }
-      }
-      /* do blend */
-      blend_general_float(ctx, n, mask, rgbaF, destF, chanType);
-      /* convert back to ubytes */
-      for (i = 0; i < n; i++) {
-         if (mask[i]) {
-            UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][RCOMP], rgbaF[i][RCOMP]);
-            UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][GCOMP], rgbaF[i][GCOMP]);
-            UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][BCOMP], rgbaF[i][BCOMP]);
-            UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][ACOMP], rgbaF[i][ACOMP]);
-         }
-      }
-   }
-   else if (chanType == GL_UNSIGNED_SHORT) {
-      GLushort (*rgba)[4] = (GLushort (*)[4]) src;
-      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
-      GLuint i;
-      /* convert ushorts to floats */
-      for (i = 0; i < n; i++) {
-         if (mask[i]) {
-            rgbaF[i][RCOMP] = USHORT_TO_FLOAT(rgba[i][RCOMP]);
-            rgbaF[i][GCOMP] = USHORT_TO_FLOAT(rgba[i][GCOMP]);
-            rgbaF[i][BCOMP] = USHORT_TO_FLOAT(rgba[i][BCOMP]);
-            rgbaF[i][ACOMP] = USHORT_TO_FLOAT(rgba[i][ACOMP]);
-            destF[i][RCOMP] = USHORT_TO_FLOAT(dest[i][RCOMP]);
-            destF[i][GCOMP] = USHORT_TO_FLOAT(dest[i][GCOMP]);
-            destF[i][BCOMP] = USHORT_TO_FLOAT(dest[i][BCOMP]);
-            destF[i][ACOMP] = USHORT_TO_FLOAT(dest[i][ACOMP]);
-         }
-      }
-      /* do blend */
-      blend_general_float(ctx, n, mask, rgbaF, destF, chanType);
-      /* convert back to ushorts */
-      for (i = 0; i < n; i++) {
-         if (mask[i]) {
-            UNCLAMPED_FLOAT_TO_USHORT(rgba[i][RCOMP], rgbaF[i][RCOMP]);
-            UNCLAMPED_FLOAT_TO_USHORT(rgba[i][GCOMP], rgbaF[i][GCOMP]);
-            UNCLAMPED_FLOAT_TO_USHORT(rgba[i][BCOMP], rgbaF[i][BCOMP]);
-            UNCLAMPED_FLOAT_TO_USHORT(rgba[i][ACOMP], rgbaF[i][ACOMP]);
-         }
-      }
-   }
-   else {
-      blend_general_float(ctx, n, mask, (GLfloat (*)[4]) src,
-                          (GLfloat (*)[4]) dst, chanType);
-   }
-}
-
-
-
-/**
- * Analyze current blending parameters to pick fastest blending function.
- * Result: the ctx->Color.BlendFunc pointer is updated.
- */
-void
-_swrast_choose_blend_func(GLcontext *ctx, GLenum chanType)
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   const GLenum eq = ctx->Color.BlendEquationRGB;
-   const GLenum srcRGB = ctx->Color.BlendSrcRGB;
-   const GLenum dstRGB = ctx->Color.BlendDstRGB;
-   const GLenum srcA = ctx->Color.BlendSrcA;
-   const GLenum dstA = ctx->Color.BlendDstA;
-
-   if (ctx->Color.BlendEquationRGB != ctx->Color.BlendEquationA) {
-      swrast->BlendFunc = blend_general;
-   }
-   else if (eq == GL_MIN) {
-      /* Note: GL_MIN ignores the blending weight factors */
-#if defined(USE_MMX_ASM)
-      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
-         swrast->BlendFunc = _mesa_mmx_blend_min;
-      }
-      else
-#endif
-         swrast->BlendFunc = blend_min;
-   }
-   else if (eq == GL_MAX) {
-      /* Note: GL_MAX ignores the blending weight factors */
-#if defined(USE_MMX_ASM)
-      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
-         swrast->BlendFunc = _mesa_mmx_blend_max;
-      }
-      else
-#endif
-         swrast->BlendFunc = blend_max;
-   }
-   else if (srcRGB != srcA || dstRGB != dstA) {
-      swrast->BlendFunc = blend_general;
-   }
-   else if (eq == GL_FUNC_ADD && srcRGB == GL_SRC_ALPHA
-            && dstRGB == GL_ONE_MINUS_SRC_ALPHA) {
-#if defined(USE_MMX_ASM)
-      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
-         swrast->BlendFunc = _mesa_mmx_blend_transparency;
-      }
-      else
-#endif
-      {
-         if (chanType == GL_UNSIGNED_BYTE)
-            swrast->BlendFunc = blend_transparency_ubyte;
-         else if (chanType == GL_UNSIGNED_SHORT)
-            swrast->BlendFunc = blend_transparency_ushort;
-         else
-            swrast->BlendFunc = blend_transparency_float;
-      }
-   }
-   else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ONE) {
-#if defined(USE_MMX_ASM)
-      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
-         swrast->BlendFunc = _mesa_mmx_blend_add;
-      }
-      else
-#endif
-         swrast->BlendFunc = blend_add;
-   }
-   else if (((eq == GL_FUNC_ADD || eq == GL_FUNC_REVERSE_SUBTRACT)
-	     && (srcRGB == GL_ZERO && dstRGB == GL_SRC_COLOR))
-	    ||
-	    ((eq == GL_FUNC_ADD || eq == GL_FUNC_SUBTRACT)
-	     && (srcRGB == GL_DST_COLOR && dstRGB == GL_ZERO))) {
-#if defined(USE_MMX_ASM)
-      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
-         swrast->BlendFunc = _mesa_mmx_blend_modulate;
-      }
-      else
-#endif
-         swrast->BlendFunc = blend_modulate;
-   }
-   else if (eq == GL_FUNC_ADD && srcRGB == GL_ZERO && dstRGB == GL_ONE) {
-      swrast->BlendFunc = blend_noop;
-   }
-   else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ZERO) {
-      swrast->BlendFunc = blend_replace;
-   }
-   else {
-      swrast->BlendFunc = blend_general;
-   }
-}
-
-
-
-/**
- * Apply the blending operator to a span of pixels.
- * We can handle horizontal runs of pixels (spans) or arrays of x/y
- * pixel coordinates.
- */
-void
-_swrast_blend_span(GLcontext *ctx, struct gl_renderbuffer *rb, SWspan *span)
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   void *rbPixels;
-
-   ASSERT(span->end <= MAX_WIDTH);
-   ASSERT(span->arrayMask & SPAN_RGBA);
-   ASSERT(rb->DataType == span->array->ChanType);
-   ASSERT(!ctx->Color._LogicOpEnabled);
-
-   rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
-
-   swrast->BlendFunc(ctx, span->end, span->array->mask,
-                     span->array->rgba, rbPixels, span->array->ChanType);
-}
+/*

+ * Mesa 3-D graphics library

+ * Version:  7.1

+ *

+ * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

+ *

+ * Permission is hereby granted, free of charge, to any person obtaining a

+ * copy of this software and associated documentation files (the "Software"),

+ * to deal in the Software without restriction, including without limitation

+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,

+ * and/or sell copies of the Software, and to permit persons to whom the

+ * Software is furnished to do so, subject to the following conditions:

+ *

+ * The above copyright notice and this permission notice shall be included

+ * in all copies or substantial portions of the Software.

+ *

+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+ */

+

+

+/**

+ * \file swrast/s_blend.c

+ * \brief software blending.

+ * \author Brian Paul

+ *

+ * Only a few blend modes have been optimized (min, max, transparency, add)

+ * more optimized cases can easily be added if needed.

+ * Celestia uses glBlendFunc(GL_SRC_ALPHA, GL_ONE), for example.

+ */

+

+

+

+#include "main/glheader.h"

+#include "main/context.h"

+#include "main/colormac.h"

+#include "main/macros.h"

+

+#include "s_blend.h"

+#include "s_context.h"

+#include "s_span.h"

+

+

+#if defined(USE_MMX_ASM)

+#include "x86/mmx.h"

+#include "x86/common_x86_asm.h"

+#define _BLENDAPI _ASMAPI

+#else

+#define _BLENDAPI

+#endif

+

+

+/**

+ * Integer divide by 255

+ * Declare "int divtemp" before using.

+ * This satisfies Glean and should be reasonably fast.

+ * Contributed by Nathan Hand.

+ */

+#define DIV255(X)  (divtemp = (X), ((divtemp << 8) + divtemp + 256) >> 16)

+

+

+

+/**

+ * Special case for glBlendFunc(GL_ZERO, GL_ONE).

+ * No-op means the framebuffer values remain unchanged.

+ * Any chanType ok.

+ */

+static void _BLENDAPI

+blend_noop(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+           GLvoid *src, const GLvoid *dst, GLenum chanType)

+{

+   GLint bytes;

+

+   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendSrcRGB == GL_ZERO);

+   ASSERT(ctx->Color.BlendDstRGB == GL_ONE);

+   (void) ctx;

+

+   /* just memcpy */

+   if (chanType == GL_UNSIGNED_BYTE)

+      bytes = 4 * n * sizeof(GLubyte);

+   else if (chanType == GL_UNSIGNED_SHORT)

+      bytes = 4 * n * sizeof(GLushort);

+   else

+      bytes = 4 * n * sizeof(GLfloat);

+

+   memcpy(src, dst, bytes);

+}

+

+

+/**

+ * Special case for glBlendFunc(GL_ONE, GL_ZERO)

+ * Any chanType ok.

+ */

+static void _BLENDAPI

+blend_replace(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+              GLvoid *src, const GLvoid *dst, GLenum chanType)

+{

+   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendSrcRGB == GL_ONE);

+   ASSERT(ctx->Color.BlendDstRGB == GL_ZERO);

+   (void) ctx;

+   (void) n;

+   (void) mask;

+   (void) src;

+   (void) dst;

+}

+

+

+/**

+ * Common transparency blending mode:

+ * glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA).

+ */

+static void _BLENDAPI

+blend_transparency_ubyte(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+                         GLvoid *src, const GLvoid *dst, GLenum chanType)

+{

+   GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;

+   const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;

+   GLuint i;

+

+   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendSrcRGB == GL_SRC_ALPHA);

+   ASSERT(ctx->Color.BlendSrcA == GL_SRC_ALPHA);

+   ASSERT(ctx->Color.BlendDstRGB == GL_ONE_MINUS_SRC_ALPHA);

+   ASSERT(ctx->Color.BlendDstA == GL_ONE_MINUS_SRC_ALPHA);

+   ASSERT(chanType == GL_UNSIGNED_BYTE);

+

+   (void) ctx;

+

+   for (i = 0; i < n; i++) {

+      if (mask[i]) {

+         const GLint t = rgba[i][ACOMP];  /* t is in [0, 255] */

+         if (t == 0) {

+            /* 0% alpha */

+            COPY_4UBV(rgba[i], dest[i]);

+         }

+         else if (t != 255) {

+	    GLint divtemp;

+            const GLint r = DIV255((rgba[i][RCOMP] - dest[i][RCOMP]) * t) + dest[i][RCOMP];

+            const GLint g = DIV255((rgba[i][GCOMP] - dest[i][GCOMP]) * t) + dest[i][GCOMP];

+            const GLint b = DIV255((rgba[i][BCOMP] - dest[i][BCOMP]) * t) + dest[i][BCOMP];

+            const GLint a = DIV255((rgba[i][ACOMP] - dest[i][ACOMP]) * t) + dest[i][ACOMP]; 

+            ASSERT(r <= 255);

+            ASSERT(g <= 255);

+            ASSERT(b <= 255);

+            ASSERT(a <= 255);

+            rgba[i][RCOMP] = (GLubyte) r;

+            rgba[i][GCOMP] = (GLubyte) g;

+            rgba[i][BCOMP] = (GLubyte) b;

+            rgba[i][ACOMP] = (GLubyte) a;

+         }

+      }

+   }

+}

+

+

+static void _BLENDAPI

+blend_transparency_ushort(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+                          GLvoid *src, const GLvoid *dst, GLenum chanType)

+{

+   GLushort (*rgba)[4] = (GLushort (*)[4]) src;

+   const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;

+   GLuint i;

+

+   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendSrcRGB == GL_SRC_ALPHA);

+   ASSERT(ctx->Color.BlendSrcA == GL_SRC_ALPHA);

+   ASSERT(ctx->Color.BlendDstRGB == GL_ONE_MINUS_SRC_ALPHA);

+   ASSERT(ctx->Color.BlendDstA == GL_ONE_MINUS_SRC_ALPHA);

+   ASSERT(chanType == GL_UNSIGNED_SHORT);

+

+   (void) ctx;

+

+   for (i = 0; i < n; i++) {

+      if (mask[i]) {

+         const GLint t = rgba[i][ACOMP];

+         if (t == 0) {

+            /* 0% alpha */

+            COPY_4V(rgba[i], dest[i]);

+         }

+         else if (t != 65535) {

+            const GLfloat tt = (GLfloat) t / 65535.0F;

+            GLushort r = (GLushort) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]);

+            GLushort g = (GLushort) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]);

+            GLushort b = (GLushort) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]);

+            GLushort a = (GLushort) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]);

+            ASSIGN_4V(rgba[i], r, g, b, a);

+         }

+      }

+   }

+}

+

+

+static void _BLENDAPI

+blend_transparency_float(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+                         GLvoid *src, const GLvoid *dst, GLenum chanType)

+{

+   GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;

+   const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;

+   GLuint i;

+

+   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendSrcRGB == GL_SRC_ALPHA);

+   ASSERT(ctx->Color.BlendSrcA == GL_SRC_ALPHA);

+   ASSERT(ctx->Color.BlendDstRGB == GL_ONE_MINUS_SRC_ALPHA);

+   ASSERT(ctx->Color.BlendDstA == GL_ONE_MINUS_SRC_ALPHA);

+   ASSERT(chanType == GL_FLOAT);

+

+   (void) ctx;

+

+   for (i = 0; i < n; i++) {

+      if (mask[i]) {

+         const GLfloat t = rgba[i][ACOMP];  /* t in [0, 1] */

+         if (t == 0.0F) {

+            /* 0% alpha */

+            COPY_4V(rgba[i], dest[i]);

+         }

+         else if (t != 1.0F) {

+            GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * t + dest[i][RCOMP];

+            GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * t + dest[i][GCOMP];

+            GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * t + dest[i][BCOMP];

+            GLfloat a = (rgba[i][ACOMP] - dest[i][ACOMP]) * t + dest[i][ACOMP];

+            ASSIGN_4V(rgba[i], r, g, b, a);

+         }

+      }

+   }

+}

+

+

+

+/**

+ * Add src and dest: glBlendFunc(GL_ONE, GL_ONE).

+ * Any chanType ok.

+ */

+static void _BLENDAPI

+blend_add(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+          GLvoid *src, const GLvoid *dst, GLenum chanType)

+{

+   GLuint i;

+

+   ASSERT(ctx->Color.BlendEquationRGB == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendEquationA == GL_FUNC_ADD);

+   ASSERT(ctx->Color.BlendSrcRGB == GL_ONE);

+   ASSERT(ctx->Color.BlendDstRGB == GL_ONE);

+   (void) ctx;

+

+   if (chanType == GL_UNSIGNED_BYTE) {

+      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;

+      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            GLint r = rgba[i][RCOMP] + dest[i][RCOMP];

+            GLint g = rgba[i][GCOMP] + dest[i][GCOMP];

+            GLint b = rgba[i][BCOMP] + dest[i][BCOMP];

+            GLint a = rgba[i][ACOMP] + dest[i][ACOMP];

+            rgba[i][RCOMP] = (GLubyte) MIN2( r, 255 );

+            rgba[i][GCOMP] = (GLubyte) MIN2( g, 255 );

+            rgba[i][BCOMP] = (GLubyte) MIN2( b, 255 );

+            rgba[i][ACOMP] = (GLubyte) MIN2( a, 255 );

+         }

+      }

+   }

+   else if (chanType == GL_UNSIGNED_SHORT) {

+      GLushort (*rgba)[4] = (GLushort (*)[4]) src;

+      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            GLint r = rgba[i][RCOMP] + dest[i][RCOMP];

+            GLint g = rgba[i][GCOMP] + dest[i][GCOMP];

+            GLint b = rgba[i][BCOMP] + dest[i][BCOMP];

+            GLint a = rgba[i][ACOMP] + dest[i][ACOMP];

+            rgba[i][RCOMP] = (GLshort) MIN2( r, 255 );

+            rgba[i][GCOMP] = (GLshort) MIN2( g, 255 );

+            rgba[i][BCOMP] = (GLshort) MIN2( b, 255 );

+            rgba[i][ACOMP] = (GLshort) MIN2( a, 255 );

+         }

+      }

+   }

+   else {

+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;

+      const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;

+      ASSERT(chanType == GL_FLOAT);

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            /* don't RGB clamp to max */

+            rgba[i][RCOMP] += dest[i][RCOMP];

+            rgba[i][GCOMP] += dest[i][GCOMP];

+            rgba[i][BCOMP] += dest[i][BCOMP];

+            rgba[i][ACOMP] += dest[i][ACOMP];

+         }

+      }

+   }

+}

+

+

+

+/**

+ * Blend min function.

+ * Any chanType ok.

+ */

+static void _BLENDAPI

+blend_min(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+          GLvoid *src, const GLvoid *dst, GLenum chanType)

+{

+   GLuint i;

+   ASSERT(ctx->Color.BlendEquationRGB == GL_MIN);

+   ASSERT(ctx->Color.BlendEquationA == GL_MIN);

+   (void) ctx;

+

+   if (chanType == GL_UNSIGNED_BYTE) {

+      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;

+      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );

+            rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );

+            rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );

+            rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );

+         }

+      }

+   }

+   else if (chanType == GL_UNSIGNED_SHORT) {

+      GLushort (*rgba)[4] = (GLushort (*)[4]) src;

+      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );

+            rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );

+            rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );

+            rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );

+         }

+      }

+   }

+   else {

+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;

+      const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;

+      ASSERT(chanType == GL_FLOAT);

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );

+            rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );

+            rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );

+            rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );

+         }

+      }

+   }

+}

+

+

+/**

+ * Blend max function.

+ * Any chanType ok.

+ */

+static void _BLENDAPI

+blend_max(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+          GLvoid *src, const GLvoid *dst, GLenum chanType)

+{

+   GLuint i;

+   ASSERT(ctx->Color.BlendEquationRGB == GL_MAX);

+   ASSERT(ctx->Color.BlendEquationA == GL_MAX);

+   (void) ctx;

+

+   if (chanType == GL_UNSIGNED_BYTE) {

+      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;

+      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );

+            rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );

+            rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );

+            rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );

+         }

+      }

+   }

+   else if (chanType == GL_UNSIGNED_SHORT) {

+      GLushort (*rgba)[4] = (GLushort (*)[4]) src;

+      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );

+            rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );

+            rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );

+            rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );

+         }

+      }

+   }

+   else {

+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;

+      const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;

+      ASSERT(chanType == GL_FLOAT);

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );

+            rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );

+            rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );

+            rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );

+         }

+      }

+   }

+}

+

+

+

+/**

+ * Modulate:  result = src * dest

+ * Any chanType ok.

+ */

+static void _BLENDAPI

+blend_modulate(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+               GLvoid *src, const GLvoid *dst, GLenum chanType)

+{

+   GLuint i;

+   (void) ctx;

+

+   if (chanType == GL_UNSIGNED_BYTE) {

+      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;

+      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+	    GLint divtemp;

+            rgba[i][RCOMP] = DIV255(rgba[i][RCOMP] * dest[i][RCOMP]);

+            rgba[i][GCOMP] = DIV255(rgba[i][GCOMP] * dest[i][GCOMP]);

+            rgba[i][BCOMP] = DIV255(rgba[i][BCOMP] * dest[i][BCOMP]);

+            rgba[i][ACOMP] = DIV255(rgba[i][ACOMP] * dest[i][ACOMP]);

+         }

+      }

+   }

+   else if (chanType == GL_UNSIGNED_SHORT) {

+      GLushort (*rgba)[4] = (GLushort (*)[4]) src;

+      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            rgba[i][RCOMP] = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16;

+            rgba[i][GCOMP] = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16;

+            rgba[i][BCOMP] = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16;

+            rgba[i][ACOMP] = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16;

+         }

+      }

+   }

+   else {

+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;

+      const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;

+      ASSERT(chanType == GL_FLOAT);

+      for (i=0;i<n;i++) {

+         if (mask[i]) {

+            rgba[i][RCOMP] = rgba[i][RCOMP] * dest[i][RCOMP];

+            rgba[i][GCOMP] = rgba[i][GCOMP] * dest[i][GCOMP];

+            rgba[i][BCOMP] = rgba[i][BCOMP] * dest[i][BCOMP];

+            rgba[i][ACOMP] = rgba[i][ACOMP] * dest[i][ACOMP];

+         }

+      }

+   }

+}

+

+

+/**

+ * Do any blending operation, using floating point.

+ * \param n  number of pixels

+ * \param mask  fragment writemask array

+ * \param rgba  array of incoming (and modified) pixels

+ * \param dest  array of pixels from the dest color buffer

+ */

+static void

+blend_general_float(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+                    GLfloat rgba[][4], GLfloat dest[][4],

+                    GLenum chanType)

+{

+   GLuint i;

+

+   for (i = 0; i < n; i++) {

+      if (mask[i]) {

+         /* Incoming/source Color */

+         const GLfloat Rs = rgba[i][RCOMP];

+         const GLfloat Gs = rgba[i][GCOMP];

+         const GLfloat Bs = rgba[i][BCOMP];

+         const GLfloat As = rgba[i][ACOMP];

+

+         /* Frame buffer/dest color */

+         const GLfloat Rd = dest[i][RCOMP];

+         const GLfloat Gd = dest[i][GCOMP];

+         const GLfloat Bd = dest[i][BCOMP];

+         const GLfloat Ad = dest[i][ACOMP];

+

+         GLfloat sR, sG, sB, sA;  /* Source factor */

+         GLfloat dR, dG, dB, dA;  /* Dest factor */

+         GLfloat r, g, b, a;      /* result color */

+

+         /* XXX for the case of constant blend terms we could init

+          * the sX and dX variables just once before the loop.

+          */

+

+         /* Source RGB factor */

+         switch (ctx->Color.BlendSrcRGB) {

+            case GL_ZERO:

+               sR = sG = sB = 0.0F;

+               break;

+            case GL_ONE:

+               sR = sG = sB = 1.0F;

+               break;

+            case GL_DST_COLOR:

+               sR = Rd;

+               sG = Gd;

+               sB = Bd;

+               break;

+            case GL_ONE_MINUS_DST_COLOR:

+               sR = 1.0F - Rd;

+               sG = 1.0F - Gd;

+               sB = 1.0F - Bd;

+               break;

+            case GL_SRC_ALPHA:

+               sR = sG = sB = As;

+               break;

+            case GL_ONE_MINUS_SRC_ALPHA:

+               sR = sG = sB = 1.0F - As;

+               break;

+            case GL_DST_ALPHA:

+               sR = sG = sB = Ad;

+               break;

+            case GL_ONE_MINUS_DST_ALPHA:

+               sR = sG = sB = 1.0F - Ad;

+               break;

+            case GL_SRC_ALPHA_SATURATE:

+               if (As < 1.0F - Ad) {

+                  sR = sG = sB = As;

+               }

+               else {

+                  sR = sG = sB = 1.0F - Ad;

+               }

+               break;

+            case GL_CONSTANT_COLOR:

+               sR = ctx->Color.BlendColor[0];

+               sG = ctx->Color.BlendColor[1];

+               sB = ctx->Color.BlendColor[2];

+               break;

+            case GL_ONE_MINUS_CONSTANT_COLOR:

+               sR = 1.0F - ctx->Color.BlendColor[0];

+               sG = 1.0F - ctx->Color.BlendColor[1];

+               sB = 1.0F - ctx->Color.BlendColor[2];

+               break;

+            case GL_CONSTANT_ALPHA:

+               sR = sG = sB = ctx->Color.BlendColor[3];

+               break;

+            case GL_ONE_MINUS_CONSTANT_ALPHA:

+               sR = sG = sB = 1.0F - ctx->Color.BlendColor[3];

+               break;

+            case GL_SRC_COLOR:

+               sR = Rs;

+               sG = Gs;

+               sB = Bs;

+               break;

+            case GL_ONE_MINUS_SRC_COLOR:

+               sR = 1.0F - Rs;

+               sG = 1.0F - Gs;

+               sB = 1.0F - Bs;

+               break;

+            default:

+               /* this should never happen */

+               _mesa_problem(ctx, "Bad blend source RGB factor in blend_general_float");

+               return;

+         }

+

+         /* Source Alpha factor */

+         switch (ctx->Color.BlendSrcA) {

+            case GL_ZERO:

+               sA = 0.0F;

+               break;

+            case GL_ONE:

+               sA = 1.0F;

+               break;

+            case GL_DST_COLOR:

+               sA = Ad;

+               break;

+            case GL_ONE_MINUS_DST_COLOR:

+               sA = 1.0F - Ad;

+               break;

+            case GL_SRC_ALPHA:

+               sA = As;

+               break;

+            case GL_ONE_MINUS_SRC_ALPHA:

+               sA = 1.0F - As;

+               break;

+            case GL_DST_ALPHA:

+               sA = Ad;

+               break;

+            case GL_ONE_MINUS_DST_ALPHA:

+               sA = 1.0F - Ad;

+               break;

+            case GL_SRC_ALPHA_SATURATE:

+               sA = 1.0;

+               break;

+            case GL_CONSTANT_COLOR:

+               sA = ctx->Color.BlendColor[3];

+               break;

+            case GL_ONE_MINUS_CONSTANT_COLOR:

+               sA = 1.0F - ctx->Color.BlendColor[3];

+               break;

+            case GL_CONSTANT_ALPHA:

+               sA = ctx->Color.BlendColor[3];

+               break;

+            case GL_ONE_MINUS_CONSTANT_ALPHA:

+               sA = 1.0F - ctx->Color.BlendColor[3];

+               break;

+            case GL_SRC_COLOR:

+               sA = As;

+               break;

+            case GL_ONE_MINUS_SRC_COLOR:

+               sA = 1.0F - As;

+               break;

+            default:

+               /* this should never happen */

+               sA = 0.0F;

+               _mesa_problem(ctx, "Bad blend source A factor in blend_general_float");

+               return;

+         }

+

+         /* Dest RGB factor */

+         switch (ctx->Color.BlendDstRGB) {

+            case GL_ZERO:

+               dR = dG = dB = 0.0F;

+               break;

+            case GL_ONE:

+               dR = dG = dB = 1.0F;

+               break;

+            case GL_SRC_COLOR:

+               dR = Rs;

+               dG = Gs;

+               dB = Bs;

+               break;

+            case GL_ONE_MINUS_SRC_COLOR:

+               dR = 1.0F - Rs;

+               dG = 1.0F - Gs;

+               dB = 1.0F - Bs;

+               break;

+            case GL_SRC_ALPHA:

+               dR = dG = dB = As;

+               break;

+            case GL_ONE_MINUS_SRC_ALPHA:

+               dR = dG = dB = 1.0F - As;

+               break;

+            case GL_DST_ALPHA:

+               dR = dG = dB = Ad;

+               break;

+            case GL_ONE_MINUS_DST_ALPHA:

+               dR = dG = dB = 1.0F - Ad;

+               break;

+            case GL_CONSTANT_COLOR:

+               dR = ctx->Color.BlendColor[0];

+               dG = ctx->Color.BlendColor[1];

+               dB = ctx->Color.BlendColor[2];

+               break;

+            case GL_ONE_MINUS_CONSTANT_COLOR:

+               dR = 1.0F - ctx->Color.BlendColor[0];

+               dG = 1.0F - ctx->Color.BlendColor[1];

+               dB = 1.0F - ctx->Color.BlendColor[2];

+               break;

+            case GL_CONSTANT_ALPHA:

+               dR = dG = dB = ctx->Color.BlendColor[3];

+               break;

+            case GL_ONE_MINUS_CONSTANT_ALPHA:

+               dR = dG = dB = 1.0F - ctx->Color.BlendColor[3];

+               break;

+            case GL_DST_COLOR:

+               dR = Rd;

+               dG = Gd;

+               dB = Bd;

+               break;

+            case GL_ONE_MINUS_DST_COLOR:

+               dR = 1.0F - Rd;

+               dG = 1.0F - Gd;

+               dB = 1.0F - Bd;

+               break;

+            default:

+               /* this should never happen */

+               dR = dG = dB = 0.0F;

+               _mesa_problem(ctx, "Bad blend dest RGB factor in blend_general_float");

+               return;

+         }

+

+         /* Dest Alpha factor */

+         switch (ctx->Color.BlendDstA) {

+            case GL_ZERO:

+               dA = 0.0F;

+               break;

+            case GL_ONE:

+               dA = 1.0F;

+               break;

+            case GL_SRC_COLOR:

+               dA = As;

+               break;

+            case GL_ONE_MINUS_SRC_COLOR:

+               dA = 1.0F - As;

+               break;

+            case GL_SRC_ALPHA:

+               dA = As;

+               break;

+            case GL_ONE_MINUS_SRC_ALPHA:

+               dA = 1.0F - As;

+               break;

+            case GL_DST_ALPHA:

+               dA = Ad;

+               break;

+            case GL_ONE_MINUS_DST_ALPHA:

+               dA = 1.0F - Ad;

+               break;

+            case GL_CONSTANT_COLOR:

+               dA = ctx->Color.BlendColor[3];

+               break;

+            case GL_ONE_MINUS_CONSTANT_COLOR:

+               dA = 1.0F - ctx->Color.BlendColor[3];

+               break;

+            case GL_CONSTANT_ALPHA:

+               dA = ctx->Color.BlendColor[3];

+               break;

+            case GL_ONE_MINUS_CONSTANT_ALPHA:

+               dA = 1.0F - ctx->Color.BlendColor[3];

+               break;

+            case GL_DST_COLOR:

+               dA = Ad;

+               break;

+            case GL_ONE_MINUS_DST_COLOR:

+               dA = 1.0F - Ad;

+               break;

+            default:

+               /* this should never happen */

+               dA = 0.0F;

+               _mesa_problem(ctx, "Bad blend dest A factor in blend_general_float");

+               return;

+         }

+

+         /* compute the blended RGB */

+         switch (ctx->Color.BlendEquationRGB) {

+         case GL_FUNC_ADD:

+            r = Rs * sR + Rd * dR;

+            g = Gs * sG + Gd * dG;

+            b = Bs * sB + Bd * dB;

+            a = As * sA + Ad * dA;

+            break;

+         case GL_FUNC_SUBTRACT:

+            r = Rs * sR - Rd * dR;

+            g = Gs * sG - Gd * dG;

+            b = Bs * sB - Bd * dB;

+            a = As * sA - Ad * dA;

+            break;

+         case GL_FUNC_REVERSE_SUBTRACT:

+            r = Rd * dR - Rs * sR;

+            g = Gd * dG - Gs * sG;

+            b = Bd * dB - Bs * sB;

+            a = Ad * dA - As * sA;

+            break;

+         case GL_MIN:

+	    r = MIN2( Rd, Rs );

+	    g = MIN2( Gd, Gs );

+	    b = MIN2( Bd, Bs );

+            break;

+         case GL_MAX:

+	    r = MAX2( Rd, Rs );

+	    g = MAX2( Gd, Gs );

+	    b = MAX2( Bd, Bs );

+            break;

+	 default:

+            /* should never get here */

+            r = g = b = 0.0F;  /* silence uninitialized var warning */

+            _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");

+            return;

+         }

+

+         /* compute the blended alpha */

+         switch (ctx->Color.BlendEquationA) {

+         case GL_FUNC_ADD:

+            a = As * sA + Ad * dA;

+            break;

+         case GL_FUNC_SUBTRACT:

+            a = As * sA - Ad * dA;

+            break;

+         case GL_FUNC_REVERSE_SUBTRACT:

+            a = Ad * dA - As * sA;

+            break;

+         case GL_MIN:

+	    a = MIN2( Ad, As );

+            break;

+         case GL_MAX:

+	    a = MAX2( Ad, As );

+            break;

+         default:

+            /* should never get here */

+            a = 0.0F;  /* silence uninitialized var warning */

+            _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");

+            return;

+         }

+

+         /* final clamping */

+#if 0

+         rgba[i][RCOMP] = MAX2( r, 0.0F );

+         rgba[i][GCOMP] = MAX2( g, 0.0F );

+         rgba[i][BCOMP] = MAX2( b, 0.0F );

+         rgba[i][ACOMP] = CLAMP( a, 0.0F, 1.0F );

+#else

+         ASSIGN_4V(rgba[i], r, g, b, a);

+#endif

+      }

+   }

+}

+

+

+/**

+ * Do any blending operation, any chanType.

+ */

+static void

+blend_general(struct gl_context *ctx, GLuint n, const GLubyte mask[],

+              void *src, const void *dst, GLenum chanType)

+{

+   GLfloat (*rgbaF)[4], (*destF)[4];

+

+   rgbaF = (GLfloat (*)[4]) malloc(4 * n * sizeof(GLfloat));

+   destF = (GLfloat (*)[4]) malloc(4 * n * sizeof(GLfloat));

+   if (!rgbaF || !destF) {

+      free(rgbaF);

+      free(destF);

+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "blending");

+      return;

+   }

+

+   if (chanType == GL_UNSIGNED_BYTE) {

+      GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;

+      const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;

+      GLuint i;

+      /* convert ubytes to floats */

+      for (i = 0; i < n; i++) {

+         if (mask[i]) {

+            rgbaF[i][RCOMP] = UBYTE_TO_FLOAT(rgba[i][RCOMP]);

+            rgbaF[i][GCOMP] = UBYTE_TO_FLOAT(rgba[i][GCOMP]);

+            rgbaF[i][BCOMP] = UBYTE_TO_FLOAT(rgba[i][BCOMP]);

+            rgbaF[i][ACOMP] = UBYTE_TO_FLOAT(rgba[i][ACOMP]);

+            destF[i][RCOMP] = UBYTE_TO_FLOAT(dest[i][RCOMP]);

+            destF[i][GCOMP] = UBYTE_TO_FLOAT(dest[i][GCOMP]);

+            destF[i][BCOMP] = UBYTE_TO_FLOAT(dest[i][BCOMP]);

+            destF[i][ACOMP] = UBYTE_TO_FLOAT(dest[i][ACOMP]);

+         }

+      }

+      /* do blend */

+      blend_general_float(ctx, n, mask, rgbaF, destF, chanType);

+      /* convert back to ubytes */

+      for (i = 0; i < n; i++) {

+         if (mask[i]) {

+            UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][RCOMP], rgbaF[i][RCOMP]);

+            UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][GCOMP], rgbaF[i][GCOMP]);

+            UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][BCOMP], rgbaF[i][BCOMP]);

+            UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][ACOMP], rgbaF[i][ACOMP]);

+         }

+      }

+   }

+   else if (chanType == GL_UNSIGNED_SHORT) {

+      GLushort (*rgba)[4] = (GLushort (*)[4]) src;

+      const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;

+      GLuint i;

+      /* convert ushorts to floats */

+      for (i = 0; i < n; i++) {

+         if (mask[i]) {

+            rgbaF[i][RCOMP] = USHORT_TO_FLOAT(rgba[i][RCOMP]);

+            rgbaF[i][GCOMP] = USHORT_TO_FLOAT(rgba[i][GCOMP]);

+            rgbaF[i][BCOMP] = USHORT_TO_FLOAT(rgba[i][BCOMP]);

+            rgbaF[i][ACOMP] = USHORT_TO_FLOAT(rgba[i][ACOMP]);

+            destF[i][RCOMP] = USHORT_TO_FLOAT(dest[i][RCOMP]);

+            destF[i][GCOMP] = USHORT_TO_FLOAT(dest[i][GCOMP]);

+            destF[i][BCOMP] = USHORT_TO_FLOAT(dest[i][BCOMP]);

+            destF[i][ACOMP] = USHORT_TO_FLOAT(dest[i][ACOMP]);

+         }

+      }

+      /* do blend */

+      blend_general_float(ctx, n, mask, rgbaF, destF, chanType);

+      /* convert back to ushorts */

+      for (i = 0; i < n; i++) {

+         if (mask[i]) {

+            UNCLAMPED_FLOAT_TO_USHORT(rgba[i][RCOMP], rgbaF[i][RCOMP]);

+            UNCLAMPED_FLOAT_TO_USHORT(rgba[i][GCOMP], rgbaF[i][GCOMP]);

+            UNCLAMPED_FLOAT_TO_USHORT(rgba[i][BCOMP], rgbaF[i][BCOMP]);

+            UNCLAMPED_FLOAT_TO_USHORT(rgba[i][ACOMP], rgbaF[i][ACOMP]);

+         }

+      }

+   }

+   else {

+      blend_general_float(ctx, n, mask, (GLfloat (*)[4]) src,

+                          (GLfloat (*)[4]) dst, chanType);

+   }

+

+   free(rgbaF);

+   free(destF);

+}

+

+

+

+/**

+ * Analyze current blending parameters to pick fastest blending function.

+ * Result: the ctx->Color.BlendFunc pointer is updated.

+ */

+void

+_swrast_choose_blend_func(struct gl_context *ctx, GLenum chanType)

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   const GLenum eq = ctx->Color.BlendEquationRGB;

+   const GLenum srcRGB = ctx->Color.BlendSrcRGB;

+   const GLenum dstRGB = ctx->Color.BlendDstRGB;

+   const GLenum srcA = ctx->Color.BlendSrcA;

+   const GLenum dstA = ctx->Color.BlendDstA;

+

+   if (ctx->Color.BlendEquationRGB != ctx->Color.BlendEquationA) {

+      swrast->BlendFunc = blend_general;

+   }

+   else if (eq == GL_MIN) {

+      /* Note: GL_MIN ignores the blending weight factors */

+#if defined(USE_MMX_ASM)

+      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {

+         swrast->BlendFunc = _mesa_mmx_blend_min;

+      }

+      else

+#endif

+         swrast->BlendFunc = blend_min;

+   }

+   else if (eq == GL_MAX) {

+      /* Note: GL_MAX ignores the blending weight factors */

+#if defined(USE_MMX_ASM)

+      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {

+         swrast->BlendFunc = _mesa_mmx_blend_max;

+      }

+      else

+#endif

+         swrast->BlendFunc = blend_max;

+   }

+   else if (srcRGB != srcA || dstRGB != dstA) {

+      swrast->BlendFunc = blend_general;

+   }

+   else if (eq == GL_FUNC_ADD && srcRGB == GL_SRC_ALPHA

+            && dstRGB == GL_ONE_MINUS_SRC_ALPHA) {

+#if defined(USE_MMX_ASM)

+      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {

+         swrast->BlendFunc = _mesa_mmx_blend_transparency;

+      }

+      else

+#endif

+      {

+         if (chanType == GL_UNSIGNED_BYTE)

+            swrast->BlendFunc = blend_transparency_ubyte;

+         else if (chanType == GL_UNSIGNED_SHORT)

+            swrast->BlendFunc = blend_transparency_ushort;

+         else

+            swrast->BlendFunc = blend_transparency_float;

+      }

+   }

+   else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ONE) {

+#if defined(USE_MMX_ASM)

+      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {

+         swrast->BlendFunc = _mesa_mmx_blend_add;

+      }

+      else

+#endif

+         swrast->BlendFunc = blend_add;

+   }

+   else if (((eq == GL_FUNC_ADD || eq == GL_FUNC_REVERSE_SUBTRACT)

+	     && (srcRGB == GL_ZERO && dstRGB == GL_SRC_COLOR))

+	    ||

+	    ((eq == GL_FUNC_ADD || eq == GL_FUNC_SUBTRACT)

+	     && (srcRGB == GL_DST_COLOR && dstRGB == GL_ZERO))) {

+#if defined(USE_MMX_ASM)

+      if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {

+         swrast->BlendFunc = _mesa_mmx_blend_modulate;

+      }

+      else

+#endif

+         swrast->BlendFunc = blend_modulate;

+   }

+   else if (eq == GL_FUNC_ADD && srcRGB == GL_ZERO && dstRGB == GL_ONE) {

+      swrast->BlendFunc = blend_noop;

+   }

+   else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ZERO) {

+      swrast->BlendFunc = blend_replace;

+   }

+   else {

+      swrast->BlendFunc = blend_general;

+   }

+}

+

+

+

+/**

+ * Apply the blending operator to a span of pixels.

+ * We can handle horizontal runs of pixels (spans) or arrays of x/y

+ * pixel coordinates.

+ */

+void

+_swrast_blend_span(struct gl_context *ctx, struct gl_renderbuffer *rb, SWspan *span)

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   void *rbPixels;

+

+   ASSERT(span->end <= MAX_WIDTH);

+   ASSERT(span->arrayMask & SPAN_RGBA);

+   ASSERT(rb->DataType == span->array->ChanType);

+   ASSERT(!ctx->Color._LogicOpEnabled);

+

+   rbPixels = _swrast_get_dest_rgba(ctx, rb, span);

+

+   swrast->BlendFunc(ctx, span->end, span->array->mask,

+                     span->array->rgba, rbPixels, span->array->ChanType);

+}