Moved the software rasterizer to a new directory.

1 files changed, 1 insertions, 633 deletions

diff --git a/src/mesa/main/blend.c b/src/mesa/main/blend.c
index 4f20d269ac2..91267cda7f0 100644
--- a/src/mesa/main/blend.c
+++ b/src/mesa/main/blend.c
@@ -1,4 +1,4 @@
-/* $Id: blend.c,v 1.23 2000/10/30 16:32:43 brianp Exp $ */
+/* $Id: blend.c,v 1.24 2000/10/31 18:09:44 keithw Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -30,13 +30,10 @@
 #include "all.h"
 #else
 #include "glheader.h"
-#include "alphabuf.h"
 #include "blend.h"
 #include "context.h"
 #include "enums.h"
 #include "macros.h"
-#include "pb.h"
-#include "span.h"
 #include "types.h"
 #endif
 
@@ -322,632 +319,3 @@ _mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
    ctx->NewState |= _NEW_COLOR;
 }
 
-#ifdef USE_MMX_ASM
-#define _BLENDAPI _ASMAPI
-#else
-#define _BLENDAPI
-#endif
-
-/*
- * Common transparency blending mode.
- */
-static void _BLENDAPI
-blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[],
-                    GLchan rgba[][4], CONST GLchan dest[][4] )
-{
-   GLuint i;
-   ASSERT(ctx->Color.BlendEquation==GL_FUNC_ADD_EXT);
-   ASSERT(ctx->Color.BlendSrcRGB==GL_SRC_ALPHA);
-   ASSERT(ctx->Color.BlendDstRGB==GL_ONE_MINUS_SRC_ALPHA);
-   (void) ctx;
-
-   for (i=0;i<n;i++) {
-      if (mask[i]) {
-         const GLint t = rgba[i][ACOMP];  /* t in [0, CHAN_MAX] */
-         if (t == 0) {
-            /* 0% alpha */
-            rgba[i][RCOMP] = dest[i][RCOMP];
-            rgba[i][GCOMP] = dest[i][GCOMP];
-            rgba[i][BCOMP] = dest[i][BCOMP];
-            rgba[i][ACOMP] = dest[i][ACOMP];
-         }
-         else if (t == CHAN_MAX) {
-            /* 100% alpha, no-op */
-         }
-         else {
-#if 0
-            /* This is pretty close, but Glean complains */
-            const GLint s = CHAN_MAX - t;
-            const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s + 1) >> 8;
-            const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s + 1) >> 8;
-            const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s + 1) >> 8;
-            const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s + 1) >> 8;
-#elif 0
-            /* This is slower but satisfies Glean */
-            const GLint s = CHAN_MAX - t;
-            const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) / 255;
-            const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) / 255;
-            const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) / 255;
-            const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) / 255;
-#else
-#if CHAN_BITS == 8
-            /* This satisfies Glean and should be reasonably fast */
-            /* Contributed by Nathan Hand */
-#define DIV255(X)  (((X) << 8) + (X) + 256) >> 16
-            const GLint s = CHAN_MAX - t;
-            const GLint r = DIV255(rgba[i][RCOMP] * t + dest[i][RCOMP] * s);
-            const GLint g = DIV255(rgba[i][GCOMP] * t + dest[i][GCOMP] * s);
-            const GLint b = DIV255(rgba[i][BCOMP] * t + dest[i][BCOMP] * s);
-            const GLint a = DIV255(rgba[i][ACOMP] * t + dest[i][ACOMP] * s);
-#undef DIV255
-#else
-            const GLint s = CHAN_MAX - t;
-            const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) / CHAN_MAX;
-            const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) / CHAN_MAX;
-            const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) / CHAN_MAX;
-            const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) / CHAN_MAX;
-#endif
-#endif
-            ASSERT(r <= CHAN_MAX);
-            ASSERT(g <= CHAN_MAX);
-            ASSERT(b <= CHAN_MAX);
-            ASSERT(a <= CHAN_MAX);
-            rgba[i][RCOMP] = (GLchan) r;
-            rgba[i][GCOMP] = (GLchan) g;
-            rgba[i][BCOMP] = (GLchan) b;
-            rgba[i][ACOMP] = (GLchan) a;
-         }
-      }
-   }
-}
-
-
-
-/*
- * Add src and dest.
- */
-static void _BLENDAPI
-blend_add( GLcontext *ctx, GLuint n, const GLubyte mask[],
-           GLchan rgba[][4], CONST GLchan dest[][4] )
-{
-   GLuint i;
-   ASSERT(ctx->Color.BlendEquation==GL_FUNC_ADD_EXT);
-   ASSERT(ctx->Color.BlendSrcRGB==GL_ONE);
-   ASSERT(ctx->Color.BlendDstRGB==GL_ONE);
-   (void) ctx;
-
-   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] = (GLchan) MIN2( r, CHAN_MAX );
-         rgba[i][GCOMP] = (GLchan) MIN2( g, CHAN_MAX );
-         rgba[i][BCOMP] = (GLchan) MIN2( b, CHAN_MAX );
-         rgba[i][ACOMP] = (GLchan) MIN2( a, CHAN_MAX );
-      }
-   }
-}
-
-
-
-/*
- * Blend min function  (for GL_EXT_blend_minmax)
- */
-static void _BLENDAPI
-blend_min( GLcontext *ctx, GLuint n, const GLubyte mask[],
-           GLchan rgba[][4], CONST GLchan dest[][4] )
-{
-   GLuint i;
-   ASSERT(ctx->Color.BlendEquation==GL_MIN_EXT);
-   (void) ctx;
-
-   for (i=0;i<n;i++) {
-      if (mask[i]) {
-         rgba[i][RCOMP] = (GLchan) MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
-         rgba[i][GCOMP] = (GLchan) MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
-         rgba[i][BCOMP] = (GLchan) MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
-         rgba[i][ACOMP] = (GLchan) MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
-      }
-   }
-}
-
-
-
-/*
- * Blend max function  (for GL_EXT_blend_minmax)
- */
-static void _BLENDAPI
-blend_max( GLcontext *ctx, GLuint n, const GLubyte mask[],
-           GLchan rgba[][4], CONST GLchan dest[][4] )
-{
-   GLuint i;
-   ASSERT(ctx->Color.BlendEquation==GL_MAX_EXT);
-   (void) ctx;
-
-   for (i=0;i<n;i++) {
-      if (mask[i]) {
-         rgba[i][RCOMP] = (GLchan) MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
-         rgba[i][GCOMP] = (GLchan) MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
-         rgba[i][BCOMP] = (GLchan) MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
-         rgba[i][ACOMP] = (GLchan) MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
-      }
-   }
-}
-
-
-
-/*
- * Modulate:  result = src * dest
- */
-static void _BLENDAPI
-blend_modulate( GLcontext *ctx, GLuint n, const GLubyte mask[],
-                GLchan rgba[][4], CONST GLchan dest[][4] )
-{
-   GLuint i;
-   (void) ctx;
-
-   for (i=0;i<n;i++) {
-      if (mask[i]) {
-         GLint r = (rgba[i][RCOMP] * dest[i][RCOMP]) >> 8;
-         GLint g = (rgba[i][GCOMP] * dest[i][GCOMP]) >> 8;
-         GLint b = (rgba[i][BCOMP] * dest[i][BCOMP]) >> 8;
-         GLint a = (rgba[i][ACOMP] * dest[i][ACOMP]) >> 8;
-         rgba[i][RCOMP] = (GLchan) r;
-         rgba[i][GCOMP] = (GLchan) g;
-         rgba[i][BCOMP] = (GLchan) b;
-         rgba[i][ACOMP] = (GLchan) a;
-      }
-   }
-}
-
-
-
-/*
- * General case blend pixels.
- * Input:  n - number of pixels
- *         mask - the usual write mask
- * In/Out:  rgba - the incoming and modified pixels
- * Input:  dest - the pixels from the dest color buffer
- */
-static void _BLENDAPI
-blend_general( GLcontext *ctx, GLuint n, const GLubyte mask[],
-               GLchan rgba[][4], CONST GLchan dest[][4] )
-{
-   GLfloat rscale = 1.0F / CHAN_MAXF;
-   GLfloat gscale = 1.0F / CHAN_MAXF;
-   GLfloat bscale = 1.0F / CHAN_MAXF;
-   GLfloat ascale = 1.0F / CHAN_MAXF;
-   GLuint i;
-
-   for (i=0;i<n;i++) {
-      if (mask[i]) {
-         GLint Rs, Gs, Bs, As;  /* Source colors */
-         GLint Rd, Gd, Bd, Ad;  /* Dest colors */
-         GLfloat sR, sG, sB, sA;  /* Source scaling */
-         GLfloat dR, dG, dB, dA;  /* Dest scaling */
-         GLfloat r, g, b, a;
-
-         /* Source Color */
-         Rs = rgba[i][RCOMP];
-         Gs = rgba[i][GCOMP];
-         Bs = rgba[i][BCOMP];
-         As = rgba[i][ACOMP];
-
-         /* Frame buffer color */
-         Rd = dest[i][RCOMP];
-         Gd = dest[i][GCOMP];
-         Bd = dest[i][BCOMP];
-         Ad = dest[i][ACOMP];
-
-         /* 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 = (GLfloat) Rd * rscale;
-               sG = (GLfloat) Gd * gscale;
-               sB = (GLfloat) Bd * bscale;
-               break;
-            case GL_ONE_MINUS_DST_COLOR:
-               sR = 1.0F - (GLfloat) Rd * rscale;
-               sG = 1.0F - (GLfloat) Gd * gscale;
-               sB = 1.0F - (GLfloat) Bd * bscale;
-               break;
-            case GL_SRC_ALPHA:
-               sR = sG = sB = (GLfloat) As * ascale;
-               break;
-            case GL_ONE_MINUS_SRC_ALPHA:
-               sR = sG = sB = (GLfloat) 1.0F - (GLfloat) As * ascale;
-               break;
-            case GL_DST_ALPHA:
-               sR = sG = sB = (GLfloat) Ad * ascale;
-               break;
-            case GL_ONE_MINUS_DST_ALPHA:
-               sR = sG = sB = 1.0F - (GLfloat) Ad * ascale;
-               break;
-            case GL_SRC_ALPHA_SATURATE:
-               if (As < CHAN_MAX - Ad) {
-                  sR = sG = sB = (GLfloat) As * ascale;
-               }
-               else {
-                  sR = sG = sB = 1.0F - (GLfloat) Ad * ascale;
-               }
-               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: /* GL_NV_blend_square */
-               sR = (GLfloat) Rs * rscale;
-               sG = (GLfloat) Gs * gscale;
-               sB = (GLfloat) Bs * bscale;
-               break;
-            case GL_ONE_MINUS_SRC_COLOR: /* GL_NV_blend_square */
-               sR = 1.0F - (GLfloat) Rs * rscale;
-               sG = 1.0F - (GLfloat) Gs * gscale;
-               sB = 1.0F - (GLfloat) Bs * bscale;
-               break;
-            default:
-               /* this should never happen */
-               gl_problem(ctx, "Bad blend source RGB factor in do_blend");
-	       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 = (GLfloat) Ad * ascale;
-               break;
-            case GL_ONE_MINUS_DST_COLOR:
-               sA = 1.0F - (GLfloat) Ad * ascale;
-               break;
-            case GL_SRC_ALPHA:
-               sA = (GLfloat) As * ascale;
-               break;
-            case GL_ONE_MINUS_SRC_ALPHA:
-               sA = (GLfloat) 1.0F - (GLfloat) As * ascale;
-               break;
-            case GL_DST_ALPHA:
-               sA =(GLfloat) Ad * ascale;
-               break;
-            case GL_ONE_MINUS_DST_ALPHA:
-               sA = 1.0F - (GLfloat) Ad * ascale;
-               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: /* GL_NV_blend_square */
-               sA = (GLfloat) As * ascale;
-               break;
-            case GL_ONE_MINUS_SRC_COLOR: /* GL_NV_blend_square */
-               sA = 1.0F - (GLfloat) As * ascale;
-               break;
-            default:
-               /* this should never happen */
-               sA = 0.0F;
-               gl_problem(ctx, "Bad blend source A factor in do_blend");
-         }
-
-         /* 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 = (GLfloat) Rs * rscale;
-               dG = (GLfloat) Gs * gscale;
-               dB = (GLfloat) Bs * bscale;
-               break;
-            case GL_ONE_MINUS_SRC_COLOR:
-               dR = 1.0F - (GLfloat) Rs * rscale;
-               dG = 1.0F - (GLfloat) Gs * gscale;
-               dB = 1.0F - (GLfloat) Bs * bscale;
-               break;
-            case GL_SRC_ALPHA:
-               dR = dG = dB = (GLfloat) As * ascale;
-               break;
-            case GL_ONE_MINUS_SRC_ALPHA:
-               dR = dG = dB = (GLfloat) 1.0F - (GLfloat) As * ascale;
-               break;
-            case GL_DST_ALPHA:
-               dR = dG = dB = (GLfloat) Ad * ascale;
-               break;
-            case GL_ONE_MINUS_DST_ALPHA:
-               dR = dG = dB = 1.0F - (GLfloat) Ad * ascale;
-               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: /* GL_NV_blend_square */
-               dR = (GLfloat) Rd * rscale;
-               dG = (GLfloat) Gd * gscale;
-               dB = (GLfloat) Bd * bscale;
-               break;
-            case GL_ONE_MINUS_DST_COLOR: /* GL_NV_blend_square */
-               dR = 1.0F - (GLfloat) Rd * rscale;
-               dG = 1.0F - (GLfloat) Gd * gscale;
-               dB = 1.0F - (GLfloat) Bd * bscale;
-               break;
-            default:
-               /* this should never happen */
-               dR = dG = dB = 0.0F;
-               gl_problem(ctx, "Bad blend dest RGB factor in do_blend");
-         }
-
-         /* 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 = (GLfloat) As * ascale;
-               break;
-            case GL_ONE_MINUS_SRC_COLOR:
-               dA = 1.0F - (GLfloat) As * ascale;
-               break;
-            case GL_SRC_ALPHA:
-               dA = (GLfloat) As * ascale;
-               break;
-            case GL_ONE_MINUS_SRC_ALPHA:
-               dA = (GLfloat) 1.0F - (GLfloat) As * ascale;
-               break;
-            case GL_DST_ALPHA:
-               dA = (GLfloat) Ad * ascale;
-               break;
-            case GL_ONE_MINUS_DST_ALPHA:
-               dA = 1.0F - (GLfloat) Ad * ascale;
-               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: /* GL_NV_blend_square */
-               dA = (GLfloat) Ad * ascale;
-               break;
-            case GL_ONE_MINUS_DST_COLOR: /* GL_NV_blend_square */
-               dA = 1.0F - (GLfloat) Ad * ascale;
-               break;
-            default:
-               /* this should never happen */
-               dA = 0.0F;
-               gl_problem(ctx, "Bad blend dest A factor in do_blend");
-	       return;
-         }
-
-         /* Due to round-off problems we have to clamp against zero. */
-         /* Optimization: we don't have to do this for all src & dst factors */
-         if (dA < 0.0F)  dA = 0.0F;
-         if (dR < 0.0F)  dR = 0.0F;
-         if (dG < 0.0F)  dG = 0.0F;
-         if (dB < 0.0F)  dB = 0.0F;
-         if (sA < 0.0F)  sA = 0.0F;
-         if (sR < 0.0F)  sR = 0.0F;
-         if (sG < 0.0F)  sG = 0.0F;
-         if (sB < 0.0F)  sB = 0.0F;
-
-         ASSERT( sR <= 1.0 );
-         ASSERT( sG <= 1.0 );
-         ASSERT( sB <= 1.0 );
-         ASSERT( sA <= 1.0 );
-         ASSERT( dR <= 1.0 );
-         ASSERT( dG <= 1.0 );
-         ASSERT( dB <= 1.0 );
-         ASSERT( dA <= 1.0 );
-
-         /* compute blended color */
-         if (ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) {
-            r = Rs * sR + Rd * dR + 0.5F;
-            g = Gs * sG + Gd * dG + 0.5F;
-            b = Bs * sB + Bd * dB + 0.5F;
-            a = As * sA + Ad * dA + 0.5F;
-         }
-         else if (ctx->Color.BlendEquation==GL_FUNC_SUBTRACT_EXT) {
-            r = Rs * sR - Rd * dR + 0.5F;
-            g = Gs * sG - Gd * dG + 0.5F;
-            b = Bs * sB - Bd * dB + 0.5F;
-            a = As * sA - Ad * dA + 0.5F;
-         }
-         else if (ctx->Color.BlendEquation==GL_FUNC_REVERSE_SUBTRACT_EXT) {
-            r = Rd * dR - Rs * sR + 0.5F;
-            g = Gd * dG - Gs * sG + 0.5F;
-            b = Bd * dB - Bs * sB + 0.5F;
-            a = Ad * dA - As * sA + 0.5F;
-         }
-         else {
-            /* should never get here */
-            r = g = b = a = 0.0F;  /* silence uninitialized var warning */
-            gl_problem(ctx, "unexpected BlendEquation in blend_general()");
-         }
-
-         /* final clamping */
-         rgba[i][RCOMP] = (GLchan) (GLint) CLAMP( r, 0.0F, CHAN_MAXF );
-         rgba[i][GCOMP] = (GLchan) (GLint) CLAMP( g, 0.0F, CHAN_MAXF );
-         rgba[i][BCOMP] = (GLchan) (GLint) CLAMP( b, 0.0F, CHAN_MAXF );
-         rgba[i][ACOMP] = (GLchan) (GLint) CLAMP( a, 0.0F, CHAN_MAXF );
-      }
-   }
-}
-
-
-
-#if defined(USE_MMX_ASM)
-#include "X86/mmx.h"
-#include "X86/common_x86_asm.h"
-#endif
-
-
-/*
- * Analyze current blending parameters to pick fastest blending function.
- * Result: the ctx->Color.BlendFunc pointer is updated.
- */
-static void set_blend_function( GLcontext *ctx )
-{
-   const GLenum eq = ctx->Color.BlendEquation;
-   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 defined(USE_MMX_ASM)
-   /* Hmm.  A table here would have 12^4 == way too many entries.
-    * Provide a hook for MMX instead.
-    */
-   if ( cpu_has_mmx ) {
-      gl_mmx_set_blend_function( ctx );
-   }
-   else
-#endif
-   if (srcRGB != srcA || dstRGB != dstA) {
-      ctx->Color.BlendFunc = blend_general;
-   }
-   else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_SRC_ALPHA
-       && dstRGB==GL_ONE_MINUS_SRC_ALPHA) {
-      ctx->Color.BlendFunc = blend_transparency;
-   }
-   else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_ONE && dstRGB==GL_ONE) {
-      ctx->Color.BlendFunc = blend_add;
-   }
-   else if (((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_REVERSE_SUBTRACT_EXT)
-             && (srcRGB==GL_ZERO && dstRGB==GL_SRC_COLOR))
-            ||
-            ((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_SUBTRACT_EXT)
-             && (srcRGB==GL_DST_COLOR && dstRGB==GL_ZERO))) {
-      ctx->Color.BlendFunc = blend_modulate;
-   }
-   else if (eq==GL_MIN_EXT) {
-      ctx->Color.BlendFunc = blend_min;
-   }
-   else if (eq==GL_MAX_EXT) {
-      ctx->Color.BlendFunc = blend_max;
-   }
-   else {
-      ctx->Color.BlendFunc = blend_general;
-   }
-}
-
-
-
-/*
- * Apply the blending operator to a span of pixels.
- * Input:  n - number of pixels in span
- *         x, y - location of leftmost pixel in span in window coords.
- *         mask - boolean mask indicating which pixels to blend.
- * In/Out:  rgba - pixel values
- */
-void
-_mesa_blend_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
-                  GLchan rgba[][4], const GLubyte mask[] )
-{
-   GLchan dest[MAX_WIDTH][4];
-
-   /* Check if device driver can do the work */
-   if (ctx->Color.BlendEquation==GL_LOGIC_OP &&
-       !ctx->Color.ColorLogicOpEnabled) {
-      return;
-   }
-
-   /* Read span of current frame buffer pixels */
-   gl_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
-
-   if (!ctx->Color.BlendFunc)
-      set_blend_function(ctx);
-
-   (*ctx->Color.BlendFunc)( ctx, n, mask, rgba, (const GLchan (*)[4])dest );
-}
-
-
-
-/*
- * Apply the blending operator to an array of pixels.
- * Input:  n - number of pixels in span
- *         x, y - array of pixel locations
- *         mask - boolean mask indicating which pixels to blend.
- * In/Out:  rgba - pixel values
- */
-void
-_mesa_blend_pixels( GLcontext *ctx,
-                    GLuint n, const GLint x[], const GLint y[],
-                    GLchan rgba[][4], const GLubyte mask[] )
-{
-   GLchan dest[PB_SIZE][4];
-
-   /* Check if device driver can do the work */
-   if (ctx->Color.BlendEquation==GL_LOGIC_OP &&
-       !ctx->Color.ColorLogicOpEnabled) {
-      return;
-   }
-
-   /* Read pixels from current color buffer */
-   (*ctx->Driver.ReadRGBAPixels)( ctx, n, x, y, dest, mask );
-   if (ctx->RasterMask & ALPHABUF_BIT) {
-      _mesa_read_alpha_pixels( ctx, n, x, y, dest, mask );
-   }
-
-   if (!ctx->Color.BlendFunc)
-      set_blend_function(ctx);
-
-   (*ctx->Color.BlendFunc)( ctx, n, mask, rgba, (const GLchan (*)[4])dest );
-}