xserver and mesa git update 28-12-2010

1 files changed, 742 insertions, 709 deletions

diff --git a/mesalib/src/mesa/swrast/s_texcombine.c b/mesalib/src/mesa/swrast/s_texcombine.c
index 2ac0aaa24..672cd77bf 100644
--- a/mesalib/src/mesa/swrast/s_texcombine.c
+++ b/mesalib/src/mesa/swrast/s_texcombine.c
@@ -1,709 +1,742 @@
-/*
- * Mesa 3-D graphics library
- * Version:  7.5
- *
- * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
- * Copyright (C) 2009  VMware, Inc.   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.
- */
-
-
-#include "main/glheader.h"
-#include "main/context.h"
-#include "main/colormac.h"
-#include "main/image.h"
-#include "main/imports.h"
-#include "program/prog_instruction.h"
-
-#include "s_context.h"
-#include "s_texcombine.h"
-
-
-/**
- * Pointer to array of float[4]
- * This type makes the code below more concise and avoids a lot of casting.
- */
-typedef float (*float4_array)[4];
-
-
-/**
- * Return array of texels for given unit.
- */
-static INLINE float4_array
-get_texel_array(SWcontext *swrast, GLuint unit)
-{
-   return (float4_array) (swrast->TexelBuffer + unit * MAX_WIDTH * 4);
-}
-
-
-
-/**
- * Do texture application for:
- *  GL_EXT_texture_env_combine
- *  GL_ARB_texture_env_combine
- *  GL_EXT_texture_env_dot3
- *  GL_ARB_texture_env_dot3
- *  GL_ATI_texture_env_combine3
- *  GL_NV_texture_env_combine4
- *  conventional GL texture env modes
- *
- * \param ctx          rendering context
- * \param unit         the texture combiner unit
- * \param n            number of fragments to process (span width)
- * \param primary_rgba incoming fragment color array
- * \param texelBuffer  pointer to texel colors for all texture units
- * 
- * \param rgba         incoming/result fragment colors
- */
-static void
-texture_combine( GLcontext *ctx, GLuint unit, GLuint n,
-                 const float4_array primary_rgba,
-                 const GLfloat *texelBuffer,
-                 GLchan (*rgbaChan)[4] )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   const struct gl_texture_unit *textureUnit = &(ctx->Texture.Unit[unit]);
-   const struct gl_tex_env_combine_state *combine = textureUnit->_CurrentCombine;
-   float4_array argRGB[MAX_COMBINER_TERMS];
-   float4_array argA[MAX_COMBINER_TERMS];
-   const GLfloat scaleRGB = (GLfloat) (1 << combine->ScaleShiftRGB);
-   const GLfloat scaleA = (GLfloat) (1 << combine->ScaleShiftA);
-   const GLuint numArgsRGB = combine->_NumArgsRGB;
-   const GLuint numArgsA = combine->_NumArgsA;
-   GLfloat ccolor[MAX_COMBINER_TERMS][MAX_WIDTH][4]; /* temp color buffers */
-   GLfloat rgba[MAX_WIDTH][4];
-   GLuint i, term;
-
-   for (i = 0; i < n; i++) {
-      rgba[i][RCOMP] = CHAN_TO_FLOAT(rgbaChan[i][RCOMP]);
-      rgba[i][GCOMP] = CHAN_TO_FLOAT(rgbaChan[i][GCOMP]);
-      rgba[i][BCOMP] = CHAN_TO_FLOAT(rgbaChan[i][BCOMP]);
-      rgba[i][ACOMP] = CHAN_TO_FLOAT(rgbaChan[i][ACOMP]);
-   }
-
-   /*
-   printf("modeRGB 0x%x  modeA 0x%x  srcRGB1 0x%x  srcA1 0x%x  srcRGB2 0x%x  srcA2 0x%x\n",
-          combine->ModeRGB,
-          combine->ModeA,
-          combine->SourceRGB[0],
-          combine->SourceA[0],
-          combine->SourceRGB[1],
-          combine->SourceA[1]);
-   */
-
-   /*
-    * Do operand setup for up to 4 operands.  Loop over the terms.
-    */
-   for (term = 0; term < numArgsRGB; term++) {
-      const GLenum srcRGB = combine->SourceRGB[term];
-      const GLenum operandRGB = combine->OperandRGB[term];
-
-      switch (srcRGB) {
-         case GL_TEXTURE:
-            argRGB[term] = get_texel_array(swrast, unit);
-            break;
-         case GL_PRIMARY_COLOR:
-            argRGB[term] = primary_rgba;
-            break;
-         case GL_PREVIOUS:
-            argRGB[term] = rgba;
-            break;
-         case GL_CONSTANT:
-            {
-               float4_array c = ccolor[term];
-               GLfloat red   = textureUnit->EnvColor[0];
-               GLfloat green = textureUnit->EnvColor[1];
-               GLfloat blue  = textureUnit->EnvColor[2];
-               GLfloat alpha = textureUnit->EnvColor[3];
-               for (i = 0; i < n; i++) {
-                  ASSIGN_4V(c[i], red, green, blue, alpha);
-               }
-               argRGB[term] = ccolor[term];
-            }
-            break;
-	 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
-	  */
-	 case GL_ZERO:
-            {
-               float4_array c = ccolor[term];
-               for (i = 0; i < n; i++) {
-                  ASSIGN_4V(c[i], 0.0F, 0.0F, 0.0F, 0.0F);
-               }
-               argRGB[term] = ccolor[term];
-            }
-            break;
-	 case GL_ONE:
-            {
-               float4_array c = ccolor[term];
-               for (i = 0; i < n; i++) {
-                  ASSIGN_4V(c[i], 1.0F, 1.0F, 1.0F, 1.0F);
-               }
-               argRGB[term] = ccolor[term];
-            }
-            break;
-         default:
-            /* ARB_texture_env_crossbar source */
-            {
-               const GLuint srcUnit = srcRGB - GL_TEXTURE0;
-               ASSERT(srcUnit < ctx->Const.MaxTextureUnits);
-               if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled)
-                  return;
-               argRGB[term] = get_texel_array(swrast, srcUnit);
-            }
-      }
-
-      if (operandRGB != GL_SRC_COLOR) {
-         float4_array src = argRGB[term];
-         float4_array dst = ccolor[term];
-
-         /* point to new arg[term] storage */
-         argRGB[term] = ccolor[term];
-
-         switch (operandRGB) {
-         case GL_ONE_MINUS_SRC_COLOR:
-            for (i = 0; i < n; i++) {
-               dst[i][RCOMP] = 1.0F - src[i][RCOMP];
-               dst[i][GCOMP] = 1.0F - src[i][GCOMP];
-               dst[i][BCOMP] = 1.0F - src[i][BCOMP];
-            }
-            break;
-         case GL_SRC_ALPHA:
-            for (i = 0; i < n; i++) {
-               dst[i][RCOMP] =
-               dst[i][GCOMP] =
-               dst[i][BCOMP] = src[i][ACOMP];
-            }
-            break;
-         case GL_ONE_MINUS_SRC_ALPHA:
-            for (i = 0; i < n; i++) {
-               dst[i][RCOMP] =
-               dst[i][GCOMP] =
-               dst[i][BCOMP] = 1.0F - src[i][ACOMP];
-            }
-            break;
-         default:
-            _mesa_problem(ctx, "Bad operandRGB");
-         }
-      }
-   }
-
-   /*
-    * Set up the argA[term] pointers
-    */
-   for (term = 0; term < numArgsA; term++) {
-      const GLenum srcA = combine->SourceA[term];
-      const GLenum operandA = combine->OperandA[term];
-
-      switch (srcA) {
-         case GL_TEXTURE:
-            argA[term] = get_texel_array(swrast, unit);
-            break;
-         case GL_PRIMARY_COLOR:
-            argA[term] = primary_rgba;
-            break;
-         case GL_PREVIOUS:
-            argA[term] = rgba;
-            break;
-         case GL_CONSTANT:
-            {
-               float4_array c = ccolor[term];
-               GLfloat alpha = textureUnit->EnvColor[3];
-               for (i = 0; i < n; i++)
-                  c[i][ACOMP] = alpha;
-               argA[term] = ccolor[term];
-            }
-            break;
-	 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
-	  */
-	 case GL_ZERO:
-            {
-               float4_array c = ccolor[term];
-               for (i = 0; i < n; i++)
-                  c[i][ACOMP] = 0.0F;
-               argA[term] = ccolor[term];
-            }
-            break;
-	 case GL_ONE:
-            {
-               float4_array c = ccolor[term];
-               for (i = 0; i < n; i++)
-                  c[i][ACOMP] = 1.0F;
-               argA[term] = ccolor[term];
-            }
-            break;
-         default:
-            /* ARB_texture_env_crossbar source */
-            {
-               const GLuint srcUnit = srcA - GL_TEXTURE0;
-               ASSERT(srcUnit < ctx->Const.MaxTextureUnits);
-               if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled)
-                  return;
-               argA[term] = get_texel_array(swrast, srcUnit);
-            }
-      }
-
-      if (operandA == GL_ONE_MINUS_SRC_ALPHA) {
-         float4_array src = argA[term];
-         float4_array dst = ccolor[term];
-         argA[term] = ccolor[term];
-         for (i = 0; i < n; i++) {
-            dst[i][ACOMP] = 1.0F - src[i][ACOMP];
-         }
-      }
-   }
-
-   /* RGB channel combine */
-   {
-      float4_array arg0 = argRGB[0];
-      float4_array arg1 = argRGB[1];
-      float4_array arg2 = argRGB[2];
-      float4_array arg3 = argRGB[3];
-
-      switch (combine->ModeRGB) {
-      case GL_REPLACE:
-         for (i = 0; i < n; i++) {
-            rgba[i][RCOMP] = arg0[i][RCOMP] * scaleRGB;
-            rgba[i][GCOMP] = arg0[i][GCOMP] * scaleRGB;
-            rgba[i][BCOMP] = arg0[i][BCOMP] * scaleRGB;
-         }
-         break;
-      case GL_MODULATE:
-         for (i = 0; i < n; i++) {
-            rgba[i][RCOMP] = arg0[i][RCOMP] * arg1[i][RCOMP] * scaleRGB;
-            rgba[i][GCOMP] = arg0[i][GCOMP] * arg1[i][GCOMP] * scaleRGB;
-            rgba[i][BCOMP] = arg0[i][BCOMP] * arg1[i][BCOMP] * scaleRGB;
-         }
-         break;
-      case GL_ADD:
-         if (textureUnit->EnvMode == GL_COMBINE4_NV) {
-            /* (a * b) + (c * d) */
-            for (i = 0; i < n; i++) {
-               rgba[i][RCOMP] = (arg0[i][RCOMP] * arg1[i][RCOMP] +
-                                 arg2[i][RCOMP] * arg3[i][RCOMP]) * scaleRGB;
-               rgba[i][GCOMP] = (arg0[i][GCOMP] * arg1[i][GCOMP] +
-                                 arg2[i][GCOMP] * arg3[i][GCOMP]) * scaleRGB;
-               rgba[i][BCOMP] = (arg0[i][BCOMP] * arg1[i][BCOMP] +
-                                 arg2[i][BCOMP] * arg3[i][BCOMP]) * scaleRGB;
-            }
-         }
-         else {
-            /* 2-term addition */
-            for (i = 0; i < n; i++) {
-               rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP]) * scaleRGB;
-               rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP]) * scaleRGB;
-               rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP]) * scaleRGB;
-            }
-         }
-         break;
-      case GL_ADD_SIGNED:
-         if (textureUnit->EnvMode == GL_COMBINE4_NV) {
-            /* (a * b) + (c * d) - 0.5 */
-            for (i = 0; i < n; i++) {
-               rgba[i][RCOMP] = (arg0[i][RCOMP] * arg1[i][RCOMP] +
-                                 arg2[i][RCOMP] * arg3[i][RCOMP] - 0.5F) * scaleRGB;
-               rgba[i][GCOMP] = (arg0[i][GCOMP] * arg1[i][GCOMP] +
-                                 arg2[i][GCOMP] * arg3[i][GCOMP] - 0.5F) * scaleRGB;
-               rgba[i][BCOMP] = (arg0[i][BCOMP] * arg1[i][BCOMP] +
-                                 arg2[i][BCOMP] * arg3[i][BCOMP] - 0.5F) * scaleRGB;
-            }
-         }
-         else {
-            for (i = 0; i < n; i++) {
-               rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP] - 0.5F) * scaleRGB;
-               rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] - 0.5F) * scaleRGB;
-               rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] - 0.5F) * scaleRGB;
-            }
-         }
-         break;
-      case GL_INTERPOLATE:
-         for (i = 0; i < n; i++) {
-            rgba[i][RCOMP] = (arg0[i][RCOMP] * arg2[i][RCOMP] +
-                          arg1[i][RCOMP] * (1.0F - arg2[i][RCOMP])) * scaleRGB;
-            rgba[i][GCOMP] = (arg0[i][GCOMP] * arg2[i][GCOMP] +
-                          arg1[i][GCOMP] * (1.0F - arg2[i][GCOMP])) * scaleRGB;
-            rgba[i][BCOMP] = (arg0[i][BCOMP] * arg2[i][BCOMP] +
-                          arg1[i][BCOMP] * (1.0F - arg2[i][BCOMP])) * scaleRGB;
-         }
-         break;
-      case GL_SUBTRACT:
-         for (i = 0; i < n; i++) {
-            rgba[i][RCOMP] = (arg0[i][RCOMP] - arg1[i][RCOMP]) * scaleRGB;
-            rgba[i][GCOMP] = (arg0[i][GCOMP] - arg1[i][GCOMP]) * scaleRGB;
-            rgba[i][BCOMP] = (arg0[i][BCOMP] - arg1[i][BCOMP]) * scaleRGB;
-         }
-         break;
-      case GL_DOT3_RGB_EXT:
-      case GL_DOT3_RGBA_EXT:
-         /* Do not scale the result by 1 2 or 4 */
-         for (i = 0; i < n; i++) {
-            GLfloat dot = ((arg0[i][RCOMP] - 0.5F) * (arg1[i][RCOMP] - 0.5F) +
-                           (arg0[i][GCOMP] - 0.5F) * (arg1[i][GCOMP] - 0.5F) +
-                           (arg0[i][BCOMP] - 0.5F) * (arg1[i][BCOMP] - 0.5F))
-               * 4.0F;
-            dot = CLAMP(dot, 0.0F, 1.0F);
-            rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = dot;
-         }
-         break;
-      case GL_DOT3_RGB:
-      case GL_DOT3_RGBA:
-         /* DO scale the result by 1 2 or 4 */
-         for (i = 0; i < n; i++) {
-            GLfloat dot = ((arg0[i][RCOMP] - 0.5F) * (arg1[i][RCOMP] - 0.5F) +
-                           (arg0[i][GCOMP] - 0.5F) * (arg1[i][GCOMP] - 0.5F) +
-                           (arg0[i][BCOMP] - 0.5F) * (arg1[i][BCOMP] - 0.5F))
-               * 4.0F * scaleRGB;
-            dot = CLAMP(dot, 0.0F, 1.0F);
-            rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = dot;
-         }
-         break;
-      case GL_MODULATE_ADD_ATI:
-         for (i = 0; i < n; i++) {
-            rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) +
-                              arg1[i][RCOMP]) * scaleRGB;
-            rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) +
-                              arg1[i][GCOMP]) * scaleRGB;
-            rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) +
-                              arg1[i][BCOMP]) * scaleRGB;
-	 }
-         break;
-      case GL_MODULATE_SIGNED_ADD_ATI:
-         for (i = 0; i < n; i++) {
-            rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) +
-                              arg1[i][RCOMP] - 0.5F) * scaleRGB;
-            rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) +
-                              arg1[i][GCOMP] - 0.5F) * scaleRGB;
-            rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) +
-                              arg1[i][BCOMP] - 0.5F) * scaleRGB;
-	 }
-         break;
-      case GL_MODULATE_SUBTRACT_ATI:
-         for (i = 0; i < n; i++) {
-            rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) -
-                              arg1[i][RCOMP]) * scaleRGB;
-            rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) -
-                              arg1[i][GCOMP]) * scaleRGB;
-            rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) -
-                              arg1[i][BCOMP]) * scaleRGB;
-	 }
-         break;
-      case GL_BUMP_ENVMAP_ATI:
-         /* this produces a fixed rgba color, and the coord calc is done elsewhere */
-         for (i = 0; i < n; i++) {
-            /* rgba result is 0,0,0,1 */
-            rgba[i][RCOMP] = 0.0;
-            rgba[i][GCOMP] = 0.0;
-            rgba[i][BCOMP] = 0.0;
-            rgba[i][ACOMP] = 1.0;
-	 }
-         return; /* no alpha processing */
-      default:
-         _mesa_problem(ctx, "invalid combine mode");
-      }
-   }
-
-   /* Alpha channel combine */
-   {
-      float4_array arg0 = argA[0];
-      float4_array arg1 = argA[1];
-      float4_array arg2 = argA[2];
-      float4_array arg3 = argA[3];
-
-      switch (combine->ModeA) {
-      case GL_REPLACE:
-         for (i = 0; i < n; i++) {
-            rgba[i][ACOMP] = arg0[i][ACOMP] * scaleA;
-         }
-         break;
-      case GL_MODULATE:
-         for (i = 0; i < n; i++) {
-            rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * scaleA;
-         }
-         break;
-      case GL_ADD:
-         if (textureUnit->EnvMode == GL_COMBINE4_NV) {
-            /* (a * b) + (c * d) */
-            for (i = 0; i < n; i++) {
-               rgba[i][ACOMP] = (arg0[i][ACOMP] * arg1[i][ACOMP] +
-                                 arg2[i][ACOMP] * arg3[i][ACOMP]) * scaleA;
-            }
-         }
-         else {
-            /* two-term add */
-            for (i = 0; i < n; i++) {
-               rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP]) * scaleA;
-            }
-         }
-         break;
-      case GL_ADD_SIGNED:
-         if (textureUnit->EnvMode == GL_COMBINE4_NV) {
-            /* (a * b) + (c * d) - 0.5 */
-            for (i = 0; i < n; i++) {
-               rgba[i][ACOMP] = (arg0[i][ACOMP] * arg1[i][ACOMP] +
-                                 arg2[i][ACOMP] * arg3[i][ACOMP] -
-                                 0.5F) * scaleA;
-            }
-         }
-         else {
-            /* a + b - 0.5 */
-            for (i = 0; i < n; i++) {
-               rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * scaleA;
-            }
-         }
-         break;
-      case GL_INTERPOLATE:
-         for (i = 0; i < n; i++) {
-            rgba[i][ACOMP] = (arg0[i][ACOMP] * arg2[i][ACOMP] +
-                              arg1[i][ACOMP] * (1.0F - arg2[i][ACOMP]))
-               * scaleA;
-         }
-         break;
-      case GL_SUBTRACT:
-         for (i = 0; i < n; i++) {
-            rgba[i][ACOMP] = (arg0[i][ACOMP] - arg1[i][ACOMP]) * scaleA;
-         }
-         break;
-      case GL_MODULATE_ADD_ATI:
-         for (i = 0; i < n; i++) {
-            rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP])
-                              + arg1[i][ACOMP]) * scaleA;
-         }
-         break;
-      case GL_MODULATE_SIGNED_ADD_ATI:
-         for (i = 0; i < n; i++) {
-            rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) +
-                              arg1[i][ACOMP] - 0.5F) * scaleA;
-         }
-         break;
-      case GL_MODULATE_SUBTRACT_ATI:
-         for (i = 0; i < n; i++) {
-            rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP])
-                              - arg1[i][ACOMP]) * scaleA;
-         }
-         break;
-      default:
-         _mesa_problem(ctx, "invalid combine mode");
-      }
-   }
-
-   /* Fix the alpha component for GL_DOT3_RGBA_EXT/ARB combining.
-    * This is kind of a kludge.  It would have been better if the spec
-    * were written such that the GL_COMBINE_ALPHA value could be set to
-    * GL_DOT3.
-    */
-   if (combine->ModeRGB == GL_DOT3_RGBA_EXT ||
-       combine->ModeRGB == GL_DOT3_RGBA) {
-      for (i = 0; i < n; i++) {
-	 rgba[i][ACOMP] = rgba[i][RCOMP];
-      }
-   }
-
-   for (i = 0; i < n; i++) {
-      UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][RCOMP], rgba[i][RCOMP]);
-      UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][GCOMP], rgba[i][GCOMP]);
-      UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][BCOMP], rgba[i][BCOMP]);
-      UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][ACOMP], rgba[i][ACOMP]);
-   }
-}
-
-
-/**
- * Apply X/Y/Z/W/0/1 swizzle to an array of colors/texels.
- * See GL_EXT_texture_swizzle.
- */
-static void
-swizzle_texels(GLuint swizzle, GLuint count, float4_array texels)
-{
-   const GLuint swzR = GET_SWZ(swizzle, 0);
-   const GLuint swzG = GET_SWZ(swizzle, 1);
-   const GLuint swzB = GET_SWZ(swizzle, 2);
-   const GLuint swzA = GET_SWZ(swizzle, 3);
-   GLfloat vector[6];
-   GLuint i;
-
-   vector[SWIZZLE_ZERO] = 0;
-   vector[SWIZZLE_ONE] = 1.0F;
-
-   for (i = 0; i < count; i++) {
-      vector[SWIZZLE_X] = texels[i][0];
-      vector[SWIZZLE_Y] = texels[i][1];
-      vector[SWIZZLE_Z] = texels[i][2];
-      vector[SWIZZLE_W] = texels[i][3];
-      texels[i][RCOMP] = vector[swzR];
-      texels[i][GCOMP] = vector[swzG];
-      texels[i][BCOMP] = vector[swzB];
-      texels[i][ACOMP] = vector[swzA];
-   }
-}
-
-
-/**
- * Apply texture mapping to a span of fragments.
- */
-void
-_swrast_texture_span( GLcontext *ctx, SWspan *span )
-{
-   SWcontext *swrast = SWRAST_CONTEXT(ctx);
-   GLfloat primary_rgba[MAX_WIDTH][4];
-   GLuint unit;
-
-   ASSERT(span->end <= MAX_WIDTH);
-
-   /*
-    * Save copy of the incoming fragment colors (the GL_PRIMARY_COLOR)
-    */
-   if (swrast->_TextureCombinePrimary) {
-      GLuint i;
-      for (i = 0; i < span->end; i++) {
-         primary_rgba[i][RCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][RCOMP]);
-         primary_rgba[i][GCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][GCOMP]);
-         primary_rgba[i][BCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][BCOMP]);
-         primary_rgba[i][ACOMP] = CHAN_TO_FLOAT(span->array->rgba[i][ACOMP]);
-      }
-   }
-
-   /* First must sample all bump maps */
-   for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
-      const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
-
-      if (texUnit->_ReallyEnabled &&
-         texUnit->_CurrentCombine->ModeRGB == GL_BUMP_ENVMAP_ATI) {
-         const GLfloat (*texcoords)[4] = (const GLfloat (*)[4])
-            span->array->attribs[FRAG_ATTRIB_TEX0 + unit];
-         float4_array targetcoords =
-            span->array->attribs[FRAG_ATTRIB_TEX0 +
-               ctx->Texture.Unit[unit].BumpTarget - GL_TEXTURE0];
-
-         const struct gl_texture_object *curObj = texUnit->_Current;
-         GLfloat *lambda = span->array->lambda[unit];
-         float4_array texels = get_texel_array(swrast, unit);
-         GLuint i;
-         GLfloat rotMatrix00 = ctx->Texture.Unit[unit].RotMatrix[0];
-         GLfloat rotMatrix01 = ctx->Texture.Unit[unit].RotMatrix[1];
-         GLfloat rotMatrix10 = ctx->Texture.Unit[unit].RotMatrix[2];
-         GLfloat rotMatrix11 = ctx->Texture.Unit[unit].RotMatrix[3];
-
-         /* adjust texture lod (lambda) */
-         if (span->arrayMask & SPAN_LAMBDA) {
-            if (texUnit->LodBias + curObj->LodBias != 0.0F) {
-               /* apply LOD bias, but don't clamp yet */
-               const GLfloat bias = CLAMP(texUnit->LodBias + curObj->LodBias,
-                                          -ctx->Const.MaxTextureLodBias,
-                                          ctx->Const.MaxTextureLodBias);
-               GLuint i;
-               for (i = 0; i < span->end; i++) {
-                  lambda[i] += bias;
-               }
-            }
-
-            if (curObj->MinLod != -1000.0 || curObj->MaxLod != 1000.0) {
-               /* apply LOD clamping to lambda */
-               const GLfloat min = curObj->MinLod;
-               const GLfloat max = curObj->MaxLod;
-               GLuint i;
-               for (i = 0; i < span->end; i++) {
-                  GLfloat l = lambda[i];
-                  lambda[i] = CLAMP(l, min, max);
-               }
-            }
-         }
-
-         /* Sample the texture (span->end = number of fragments) */
-         swrast->TextureSample[unit]( ctx, texUnit->_Current, span->end,
-                                      texcoords, lambda, texels );
-
-         /* manipulate the span values of the bump target
-            not sure this can work correctly even ignoring
-            the problem that channel is unsigned */
-         for (i = 0; i < span->end; i++) {
-            targetcoords[i][0] += (texels[i][0] * rotMatrix00 + texels[i][1] *
-                                  rotMatrix01) / targetcoords[i][3];
-            targetcoords[i][1] += (texels[i][0] * rotMatrix10 + texels[i][1] *
-                                  rotMatrix11) / targetcoords[i][3];
-         }
-      }
-   }
-
-   /*
-    * Must do all texture sampling before combining in order to
-    * accomodate GL_ARB_texture_env_crossbar.
-    */
-   for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
-      const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
-      if (texUnit->_ReallyEnabled &&
-          texUnit->_CurrentCombine->ModeRGB != GL_BUMP_ENVMAP_ATI) {
-         const GLfloat (*texcoords)[4] = (const GLfloat (*)[4])
-            span->array->attribs[FRAG_ATTRIB_TEX0 + unit];
-         const struct gl_texture_object *curObj = texUnit->_Current;
-         GLfloat *lambda = span->array->lambda[unit];
-         float4_array texels = get_texel_array(swrast, unit);
-
-         /* adjust texture lod (lambda) */
-         if (span->arrayMask & SPAN_LAMBDA) {
-            if (texUnit->LodBias + curObj->LodBias != 0.0F) {
-               /* apply LOD bias, but don't clamp yet */
-               const GLfloat bias = CLAMP(texUnit->LodBias + curObj->LodBias,
-                                          -ctx->Const.MaxTextureLodBias,
-                                          ctx->Const.MaxTextureLodBias);
-               GLuint i;
-               for (i = 0; i < span->end; i++) {
-                  lambda[i] += bias;
-               }
-            }
-
-            if (curObj->MinLod != -1000.0 || curObj->MaxLod != 1000.0) {
-               /* apply LOD clamping to lambda */
-               const GLfloat min = curObj->MinLod;
-               const GLfloat max = curObj->MaxLod;
-               GLuint i;
-               for (i = 0; i < span->end; i++) {
-                  GLfloat l = lambda[i];
-                  lambda[i] = CLAMP(l, min, max);
-               }
-            }
-         }
-
-         /* Sample the texture (span->end = number of fragments) */
-         swrast->TextureSample[unit]( ctx, texUnit->_Current, span->end,
-                                      texcoords, lambda, texels );
-
-         /* GL_SGI_texture_color_table */
-         if (texUnit->ColorTableEnabled) {
-            _mesa_lookup_rgba_float(&texUnit->ColorTable, span->end, texels);
-         }
-
-         /* GL_EXT_texture_swizzle */
-         if (curObj->_Swizzle != SWIZZLE_NOOP) {
-            swizzle_texels(curObj->_Swizzle, span->end, texels);
-         }
-      }
-   }
-
-   /*
-    * OK, now apply the texture (aka texture combine/blend).
-    * We modify the span->color.rgba values.
-    */
-   for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
-      if (ctx->Texture.Unit[unit]._ReallyEnabled) {
-         texture_combine( ctx, unit, span->end,
-                          primary_rgba,
-                          swrast->TexelBuffer,
-                          span->array->rgba );
-      }
-   }
-}
+/*

+ * Mesa 3-D graphics library

+ * Version:  7.5

+ *

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

+ * Copyright (C) 2009  VMware, Inc.   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.

+ */

+

+

+#include "main/glheader.h"

+#include "main/context.h"

+#include "main/colormac.h"

+#include "main/imports.h"

+#include "main/pixeltransfer.h"

+#include "program/prog_instruction.h"

+

+#include "s_context.h"

+#include "s_texcombine.h"

+

+

+/**

+ * Pointer to array of float[4]

+ * This type makes the code below more concise and avoids a lot of casting.

+ */

+typedef float (*float4_array)[4];

+

+

+/**

+ * Return array of texels for given unit.

+ */

+static INLINE float4_array

+get_texel_array(SWcontext *swrast, GLuint unit)

+{

+   return (float4_array) (swrast->TexelBuffer + unit * MAX_WIDTH * 4);

+}

+

+

+

+/**

+ * Do texture application for:

+ *  GL_EXT_texture_env_combine

+ *  GL_ARB_texture_env_combine

+ *  GL_EXT_texture_env_dot3

+ *  GL_ARB_texture_env_dot3

+ *  GL_ATI_texture_env_combine3

+ *  GL_NV_texture_env_combine4

+ *  conventional GL texture env modes

+ *

+ * \param ctx          rendering context

+ * \param unit         the texture combiner unit

+ * \param n            number of fragments to process (span width)

+ * \param primary_rgba incoming fragment color array

+ * \param texelBuffer  pointer to texel colors for all texture units

+ * 

+ * \param rgba         incoming/result fragment colors

+ */

+static void

+texture_combine( struct gl_context *ctx, GLuint unit, GLuint n,

+                 const float4_array primary_rgba,

+                 const GLfloat *texelBuffer,

+                 GLchan (*rgbaChan)[4] )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   const struct gl_texture_unit *textureUnit = &(ctx->Texture.Unit[unit]);

+   const struct gl_tex_env_combine_state *combine = textureUnit->_CurrentCombine;

+   float4_array argRGB[MAX_COMBINER_TERMS];

+   float4_array argA[MAX_COMBINER_TERMS];

+   const GLfloat scaleRGB = (GLfloat) (1 << combine->ScaleShiftRGB);

+   const GLfloat scaleA = (GLfloat) (1 << combine->ScaleShiftA);

+   const GLuint numArgsRGB = combine->_NumArgsRGB;

+   const GLuint numArgsA = combine->_NumArgsA;

+   float4_array ccolor[4], rgba;

+   GLuint i, term;

+

+   /* alloc temp pixel buffers */

+   rgba = (float4_array) malloc(4 * n * sizeof(GLfloat));

+   if (!rgba) {

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

+      return;

+   }

+

+   for (i = 0; i < numArgsRGB || i < numArgsA; i++) {

+      ccolor[i] = (float4_array) malloc(4 * n * sizeof(GLfloat));

+      if (!ccolor[i]) {

+         while (i) {

+            free(ccolor[i]);

+            i--;

+         }

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

+         return;

+      }

+   }

+

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

+      rgba[i][RCOMP] = CHAN_TO_FLOAT(rgbaChan[i][RCOMP]);

+      rgba[i][GCOMP] = CHAN_TO_FLOAT(rgbaChan[i][GCOMP]);

+      rgba[i][BCOMP] = CHAN_TO_FLOAT(rgbaChan[i][BCOMP]);

+      rgba[i][ACOMP] = CHAN_TO_FLOAT(rgbaChan[i][ACOMP]);

+   }

+

+   /*

+   printf("modeRGB 0x%x  modeA 0x%x  srcRGB1 0x%x  srcA1 0x%x  srcRGB2 0x%x  srcA2 0x%x\n",

+          combine->ModeRGB,

+          combine->ModeA,

+          combine->SourceRGB[0],

+          combine->SourceA[0],

+          combine->SourceRGB[1],

+          combine->SourceA[1]);

+   */

+

+   /*

+    * Do operand setup for up to 4 operands.  Loop over the terms.

+    */

+   for (term = 0; term < numArgsRGB; term++) {

+      const GLenum srcRGB = combine->SourceRGB[term];

+      const GLenum operandRGB = combine->OperandRGB[term];

+

+      switch (srcRGB) {

+         case GL_TEXTURE:

+            argRGB[term] = get_texel_array(swrast, unit);

+            break;

+         case GL_PRIMARY_COLOR:

+            argRGB[term] = primary_rgba;

+            break;

+         case GL_PREVIOUS:

+            argRGB[term] = rgba;

+            break;

+         case GL_CONSTANT:

+            {

+               float4_array c = ccolor[term];

+               GLfloat red   = textureUnit->EnvColor[0];

+               GLfloat green = textureUnit->EnvColor[1];

+               GLfloat blue  = textureUnit->EnvColor[2];

+               GLfloat alpha = textureUnit->EnvColor[3];

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

+                  ASSIGN_4V(c[i], red, green, blue, alpha);

+               }

+               argRGB[term] = ccolor[term];

+            }

+            break;

+	 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.

+	  */

+	 case GL_ZERO:

+            {

+               float4_array c = ccolor[term];

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

+                  ASSIGN_4V(c[i], 0.0F, 0.0F, 0.0F, 0.0F);

+               }

+               argRGB[term] = ccolor[term];

+            }

+            break;

+	 case GL_ONE:

+            {

+               float4_array c = ccolor[term];

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

+                  ASSIGN_4V(c[i], 1.0F, 1.0F, 1.0F, 1.0F);

+               }

+               argRGB[term] = ccolor[term];

+            }

+            break;

+         default:

+            /* ARB_texture_env_crossbar source */

+            {

+               const GLuint srcUnit = srcRGB - GL_TEXTURE0;

+               ASSERT(srcUnit < ctx->Const.MaxTextureUnits);

+               if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled)

+                  goto end;

+               argRGB[term] = get_texel_array(swrast, srcUnit);

+            }

+      }

+

+      if (operandRGB != GL_SRC_COLOR) {

+         float4_array src = argRGB[term];

+         float4_array dst = ccolor[term];

+

+         /* point to new arg[term] storage */

+         argRGB[term] = ccolor[term];

+

+         switch (operandRGB) {

+         case GL_ONE_MINUS_SRC_COLOR:

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

+               dst[i][RCOMP] = 1.0F - src[i][RCOMP];

+               dst[i][GCOMP] = 1.0F - src[i][GCOMP];

+               dst[i][BCOMP] = 1.0F - src[i][BCOMP];

+            }

+            break;

+         case GL_SRC_ALPHA:

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

+               dst[i][RCOMP] =

+               dst[i][GCOMP] =

+               dst[i][BCOMP] = src[i][ACOMP];

+            }

+            break;

+         case GL_ONE_MINUS_SRC_ALPHA:

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

+               dst[i][RCOMP] =

+               dst[i][GCOMP] =

+               dst[i][BCOMP] = 1.0F - src[i][ACOMP];

+            }

+            break;

+         default:

+            _mesa_problem(ctx, "Bad operandRGB");

+         }

+      }

+   }

+

+   /*

+    * Set up the argA[term] pointers

+    */

+   for (term = 0; term < numArgsA; term++) {

+      const GLenum srcA = combine->SourceA[term];

+      const GLenum operandA = combine->OperandA[term];

+

+      switch (srcA) {

+         case GL_TEXTURE:

+            argA[term] = get_texel_array(swrast, unit);

+            break;

+         case GL_PRIMARY_COLOR:

+            argA[term] = primary_rgba;

+            break;

+         case GL_PREVIOUS:

+            argA[term] = rgba;

+            break;

+         case GL_CONSTANT:

+            {

+               float4_array c = ccolor[term];

+               GLfloat alpha = textureUnit->EnvColor[3];

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

+                  c[i][ACOMP] = alpha;

+               argA[term] = ccolor[term];

+            }

+            break;

+	 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.

+	  */

+	 case GL_ZERO:

+            {

+               float4_array c = ccolor[term];

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

+                  c[i][ACOMP] = 0.0F;

+               argA[term] = ccolor[term];

+            }

+            break;

+	 case GL_ONE:

+            {

+               float4_array c = ccolor[term];

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

+                  c[i][ACOMP] = 1.0F;

+               argA[term] = ccolor[term];

+            }

+            break;

+         default:

+            /* ARB_texture_env_crossbar source */

+            {

+               const GLuint srcUnit = srcA - GL_TEXTURE0;

+               ASSERT(srcUnit < ctx->Const.MaxTextureUnits);

+               if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled)

+                  goto end;

+               argA[term] = get_texel_array(swrast, srcUnit);

+            }

+      }

+

+      if (operandA == GL_ONE_MINUS_SRC_ALPHA) {

+         float4_array src = argA[term];

+         float4_array dst = ccolor[term];

+         argA[term] = ccolor[term];

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

+            dst[i][ACOMP] = 1.0F - src[i][ACOMP];

+         }

+      }

+   }

+

+   /* RGB channel combine */

+   {

+      float4_array arg0 = argRGB[0];

+      float4_array arg1 = argRGB[1];

+      float4_array arg2 = argRGB[2];

+      float4_array arg3 = argRGB[3];

+

+      switch (combine->ModeRGB) {

+      case GL_REPLACE:

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

+            rgba[i][RCOMP] = arg0[i][RCOMP] * scaleRGB;

+            rgba[i][GCOMP] = arg0[i][GCOMP] * scaleRGB;

+            rgba[i][BCOMP] = arg0[i][BCOMP] * scaleRGB;

+         }

+         break;

+      case GL_MODULATE:

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

+            rgba[i][RCOMP] = arg0[i][RCOMP] * arg1[i][RCOMP] * scaleRGB;

+            rgba[i][GCOMP] = arg0[i][GCOMP] * arg1[i][GCOMP] * scaleRGB;

+            rgba[i][BCOMP] = arg0[i][BCOMP] * arg1[i][BCOMP] * scaleRGB;

+         }

+         break;

+      case GL_ADD:

+         if (textureUnit->EnvMode == GL_COMBINE4_NV) {

+            /* (a * b) + (c * d) */

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

+               rgba[i][RCOMP] = (arg0[i][RCOMP] * arg1[i][RCOMP] +

+                                 arg2[i][RCOMP] * arg3[i][RCOMP]) * scaleRGB;

+               rgba[i][GCOMP] = (arg0[i][GCOMP] * arg1[i][GCOMP] +

+                                 arg2[i][GCOMP] * arg3[i][GCOMP]) * scaleRGB;

+               rgba[i][BCOMP] = (arg0[i][BCOMP] * arg1[i][BCOMP] +

+                                 arg2[i][BCOMP] * arg3[i][BCOMP]) * scaleRGB;

+            }

+         }

+         else {

+            /* 2-term addition */

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

+               rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP]) * scaleRGB;

+               rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP]) * scaleRGB;

+               rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP]) * scaleRGB;

+            }

+         }

+         break;

+      case GL_ADD_SIGNED:

+         if (textureUnit->EnvMode == GL_COMBINE4_NV) {

+            /* (a * b) + (c * d) - 0.5 */

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

+               rgba[i][RCOMP] = (arg0[i][RCOMP] * arg1[i][RCOMP] +

+                                 arg2[i][RCOMP] * arg3[i][RCOMP] - 0.5F) * scaleRGB;

+               rgba[i][GCOMP] = (arg0[i][GCOMP] * arg1[i][GCOMP] +

+                                 arg2[i][GCOMP] * arg3[i][GCOMP] - 0.5F) * scaleRGB;

+               rgba[i][BCOMP] = (arg0[i][BCOMP] * arg1[i][BCOMP] +

+                                 arg2[i][BCOMP] * arg3[i][BCOMP] - 0.5F) * scaleRGB;

+            }

+         }

+         else {

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

+               rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP] - 0.5F) * scaleRGB;

+               rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] - 0.5F) * scaleRGB;

+               rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] - 0.5F) * scaleRGB;

+            }

+         }

+         break;

+      case GL_INTERPOLATE:

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

+            rgba[i][RCOMP] = (arg0[i][RCOMP] * arg2[i][RCOMP] +

+                          arg1[i][RCOMP] * (1.0F - arg2[i][RCOMP])) * scaleRGB;

+            rgba[i][GCOMP] = (arg0[i][GCOMP] * arg2[i][GCOMP] +

+                          arg1[i][GCOMP] * (1.0F - arg2[i][GCOMP])) * scaleRGB;

+            rgba[i][BCOMP] = (arg0[i][BCOMP] * arg2[i][BCOMP] +

+                          arg1[i][BCOMP] * (1.0F - arg2[i][BCOMP])) * scaleRGB;

+         }

+         break;

+      case GL_SUBTRACT:

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

+            rgba[i][RCOMP] = (arg0[i][RCOMP] - arg1[i][RCOMP]) * scaleRGB;

+            rgba[i][GCOMP] = (arg0[i][GCOMP] - arg1[i][GCOMP]) * scaleRGB;

+            rgba[i][BCOMP] = (arg0[i][BCOMP] - arg1[i][BCOMP]) * scaleRGB;

+         }

+         break;

+      case GL_DOT3_RGB_EXT:

+      case GL_DOT3_RGBA_EXT:

+         /* Do not scale the result by 1 2 or 4 */

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

+            GLfloat dot = ((arg0[i][RCOMP] - 0.5F) * (arg1[i][RCOMP] - 0.5F) +

+                           (arg0[i][GCOMP] - 0.5F) * (arg1[i][GCOMP] - 0.5F) +

+                           (arg0[i][BCOMP] - 0.5F) * (arg1[i][BCOMP] - 0.5F))

+               * 4.0F;

+            dot = CLAMP(dot, 0.0F, 1.0F);

+            rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = dot;

+         }

+         break;

+      case GL_DOT3_RGB:

+      case GL_DOT3_RGBA:

+         /* DO scale the result by 1 2 or 4 */

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

+            GLfloat dot = ((arg0[i][RCOMP] - 0.5F) * (arg1[i][RCOMP] - 0.5F) +

+                           (arg0[i][GCOMP] - 0.5F) * (arg1[i][GCOMP] - 0.5F) +

+                           (arg0[i][BCOMP] - 0.5F) * (arg1[i][BCOMP] - 0.5F))

+               * 4.0F * scaleRGB;

+            dot = CLAMP(dot, 0.0F, 1.0F);

+            rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = dot;

+         }

+         break;

+      case GL_MODULATE_ADD_ATI:

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

+            rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) +

+                              arg1[i][RCOMP]) * scaleRGB;

+            rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) +

+                              arg1[i][GCOMP]) * scaleRGB;

+            rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) +

+                              arg1[i][BCOMP]) * scaleRGB;

+	 }

+         break;

+      case GL_MODULATE_SIGNED_ADD_ATI:

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

+            rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) +

+                              arg1[i][RCOMP] - 0.5F) * scaleRGB;

+            rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) +

+                              arg1[i][GCOMP] - 0.5F) * scaleRGB;

+            rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) +

+                              arg1[i][BCOMP] - 0.5F) * scaleRGB;

+	 }

+         break;

+      case GL_MODULATE_SUBTRACT_ATI:

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

+            rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) -

+                              arg1[i][RCOMP]) * scaleRGB;

+            rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) -

+                              arg1[i][GCOMP]) * scaleRGB;

+            rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) -

+                              arg1[i][BCOMP]) * scaleRGB;

+	 }

+         break;

+      case GL_BUMP_ENVMAP_ATI:

+         /* this produces a fixed rgba color, and the coord calc is done elsewhere */

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

+            /* rgba result is 0,0,0,1 */

+            rgba[i][RCOMP] = 0.0;

+            rgba[i][GCOMP] = 0.0;

+            rgba[i][BCOMP] = 0.0;

+            rgba[i][ACOMP] = 1.0;

+	 }

+         goto end; /* no alpha processing */

+      default:

+         _mesa_problem(ctx, "invalid combine mode");

+      }

+   }

+

+   /* Alpha channel combine */

+   {

+      float4_array arg0 = argA[0];

+      float4_array arg1 = argA[1];

+      float4_array arg2 = argA[2];

+      float4_array arg3 = argA[3];

+

+      switch (combine->ModeA) {

+      case GL_REPLACE:

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

+            rgba[i][ACOMP] = arg0[i][ACOMP] * scaleA;

+         }

+         break;

+      case GL_MODULATE:

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

+            rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * scaleA;

+         }

+         break;

+      case GL_ADD:

+         if (textureUnit->EnvMode == GL_COMBINE4_NV) {

+            /* (a * b) + (c * d) */

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

+               rgba[i][ACOMP] = (arg0[i][ACOMP] * arg1[i][ACOMP] +

+                                 arg2[i][ACOMP] * arg3[i][ACOMP]) * scaleA;

+            }

+         }

+         else {

+            /* two-term add */

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

+               rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP]) * scaleA;

+            }

+         }

+         break;

+      case GL_ADD_SIGNED:

+         if (textureUnit->EnvMode == GL_COMBINE4_NV) {

+            /* (a * b) + (c * d) - 0.5 */

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

+               rgba[i][ACOMP] = (arg0[i][ACOMP] * arg1[i][ACOMP] +

+                                 arg2[i][ACOMP] * arg3[i][ACOMP] -

+                                 0.5F) * scaleA;

+            }

+         }

+         else {

+            /* a + b - 0.5 */

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

+               rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * scaleA;

+            }

+         }

+         break;

+      case GL_INTERPOLATE:

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

+            rgba[i][ACOMP] = (arg0[i][ACOMP] * arg2[i][ACOMP] +

+                              arg1[i][ACOMP] * (1.0F - arg2[i][ACOMP]))

+               * scaleA;

+         }

+         break;

+      case GL_SUBTRACT:

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

+            rgba[i][ACOMP] = (arg0[i][ACOMP] - arg1[i][ACOMP]) * scaleA;

+         }

+         break;

+      case GL_MODULATE_ADD_ATI:

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

+            rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP])

+                              + arg1[i][ACOMP]) * scaleA;

+         }

+         break;

+      case GL_MODULATE_SIGNED_ADD_ATI:

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

+            rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) +

+                              arg1[i][ACOMP] - 0.5F) * scaleA;

+         }

+         break;

+      case GL_MODULATE_SUBTRACT_ATI:

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

+            rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP])

+                              - arg1[i][ACOMP]) * scaleA;

+         }

+         break;

+      default:

+         _mesa_problem(ctx, "invalid combine mode");

+      }

+   }

+

+   /* Fix the alpha component for GL_DOT3_RGBA_EXT/ARB combining.

+    * This is kind of a kludge.  It would have been better if the spec

+    * were written such that the GL_COMBINE_ALPHA value could be set to

+    * GL_DOT3.

+    */

+   if (combine->ModeRGB == GL_DOT3_RGBA_EXT ||

+       combine->ModeRGB == GL_DOT3_RGBA) {

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

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

+      }

+   }

+

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

+      UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][RCOMP], rgba[i][RCOMP]);

+      UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][GCOMP], rgba[i][GCOMP]);

+      UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][BCOMP], rgba[i][BCOMP]);

+      UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][ACOMP], rgba[i][ACOMP]);

+   }

+

+end:

+   for (i = 0; i < numArgsRGB || i < numArgsA; i++) {

+      free(ccolor[i]);

+   }

+   free(rgba);

+}

+

+

+/**

+ * Apply X/Y/Z/W/0/1 swizzle to an array of colors/texels.

+ * See GL_EXT_texture_swizzle.

+ */

+static void

+swizzle_texels(GLuint swizzle, GLuint count, float4_array texels)

+{

+   const GLuint swzR = GET_SWZ(swizzle, 0);

+   const GLuint swzG = GET_SWZ(swizzle, 1);

+   const GLuint swzB = GET_SWZ(swizzle, 2);

+   const GLuint swzA = GET_SWZ(swizzle, 3);

+   GLfloat vector[6];

+   GLuint i;

+

+   vector[SWIZZLE_ZERO] = 0;

+   vector[SWIZZLE_ONE] = 1.0F;

+

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

+      vector[SWIZZLE_X] = texels[i][0];

+      vector[SWIZZLE_Y] = texels[i][1];

+      vector[SWIZZLE_Z] = texels[i][2];

+      vector[SWIZZLE_W] = texels[i][3];

+      texels[i][RCOMP] = vector[swzR];

+      texels[i][GCOMP] = vector[swzG];

+      texels[i][BCOMP] = vector[swzB];

+      texels[i][ACOMP] = vector[swzA];

+   }

+}

+

+

+/**

+ * Apply texture mapping to a span of fragments.

+ */

+void

+_swrast_texture_span( struct gl_context *ctx, SWspan *span )

+{

+   SWcontext *swrast = SWRAST_CONTEXT(ctx);

+   float4_array primary_rgba;

+   GLuint unit;

+

+   primary_rgba = (float4_array) malloc(span->end * 4 * sizeof(GLfloat));

+

+   if (!primary_rgba) {

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

+      return;

+   }

+

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

+

+   /*

+    * Save copy of the incoming fragment colors (the GL_PRIMARY_COLOR)

+    */

+   if (swrast->_TextureCombinePrimary) {

+      GLuint i;

+      for (i = 0; i < span->end; i++) {

+         primary_rgba[i][RCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][RCOMP]);

+         primary_rgba[i][GCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][GCOMP]);

+         primary_rgba[i][BCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][BCOMP]);

+         primary_rgba[i][ACOMP] = CHAN_TO_FLOAT(span->array->rgba[i][ACOMP]);

+      }

+   }

+

+   /* First must sample all bump maps */

+   for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {

+      const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];

+

+      if (texUnit->_ReallyEnabled &&

+         texUnit->_CurrentCombine->ModeRGB == GL_BUMP_ENVMAP_ATI) {

+         const GLfloat (*texcoords)[4] = (const GLfloat (*)[4])

+            span->array->attribs[FRAG_ATTRIB_TEX0 + unit];

+         float4_array targetcoords =

+            span->array->attribs[FRAG_ATTRIB_TEX0 +

+               ctx->Texture.Unit[unit].BumpTarget - GL_TEXTURE0];

+

+         const struct gl_texture_object *curObj = texUnit->_Current;

+         GLfloat *lambda = span->array->lambda[unit];

+         float4_array texels = get_texel_array(swrast, unit);

+         GLuint i;

+         GLfloat rotMatrix00 = ctx->Texture.Unit[unit].RotMatrix[0];

+         GLfloat rotMatrix01 = ctx->Texture.Unit[unit].RotMatrix[1];

+         GLfloat rotMatrix10 = ctx->Texture.Unit[unit].RotMatrix[2];

+         GLfloat rotMatrix11 = ctx->Texture.Unit[unit].RotMatrix[3];

+

+         /* adjust texture lod (lambda) */

+         if (span->arrayMask & SPAN_LAMBDA) {

+            if (texUnit->LodBias + curObj->LodBias != 0.0F) {

+               /* apply LOD bias, but don't clamp yet */

+               const GLfloat bias = CLAMP(texUnit->LodBias + curObj->LodBias,

+                                          -ctx->Const.MaxTextureLodBias,

+                                          ctx->Const.MaxTextureLodBias);

+               GLuint i;

+               for (i = 0; i < span->end; i++) {

+                  lambda[i] += bias;

+               }

+            }

+

+            if (curObj->MinLod != -1000.0 || curObj->MaxLod != 1000.0) {

+               /* apply LOD clamping to lambda */

+               const GLfloat min = curObj->MinLod;

+               const GLfloat max = curObj->MaxLod;

+               GLuint i;

+               for (i = 0; i < span->end; i++) {

+                  GLfloat l = lambda[i];

+                  lambda[i] = CLAMP(l, min, max);

+               }

+            }

+         }

+

+         /* Sample the texture (span->end = number of fragments) */

+         swrast->TextureSample[unit]( ctx, texUnit->_Current, span->end,

+                                      texcoords, lambda, texels );

+

+         /* manipulate the span values of the bump target

+            not sure this can work correctly even ignoring

+            the problem that channel is unsigned */

+         for (i = 0; i < span->end; i++) {

+            targetcoords[i][0] += (texels[i][0] * rotMatrix00 + texels[i][1] *

+                                  rotMatrix01) / targetcoords[i][3];

+            targetcoords[i][1] += (texels[i][0] * rotMatrix10 + texels[i][1] *

+                                  rotMatrix11) / targetcoords[i][3];

+         }

+      }

+   }

+

+   /*

+    * Must do all texture sampling before combining in order to

+    * accomodate GL_ARB_texture_env_crossbar.

+    */

+   for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {

+      const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];

+      if (texUnit->_ReallyEnabled &&

+          texUnit->_CurrentCombine->ModeRGB != GL_BUMP_ENVMAP_ATI) {

+         const GLfloat (*texcoords)[4] = (const GLfloat (*)[4])

+            span->array->attribs[FRAG_ATTRIB_TEX0 + unit];

+         const struct gl_texture_object *curObj = texUnit->_Current;

+         GLfloat *lambda = span->array->lambda[unit];

+         float4_array texels = get_texel_array(swrast, unit);

+

+         /* adjust texture lod (lambda) */

+         if (span->arrayMask & SPAN_LAMBDA) {

+            if (texUnit->LodBias + curObj->LodBias != 0.0F) {

+               /* apply LOD bias, but don't clamp yet */

+               const GLfloat bias = CLAMP(texUnit->LodBias + curObj->LodBias,

+                                          -ctx->Const.MaxTextureLodBias,

+                                          ctx->Const.MaxTextureLodBias);

+               GLuint i;

+               for (i = 0; i < span->end; i++) {

+                  lambda[i] += bias;

+               }

+            }

+

+            if (curObj->MinLod != -1000.0 || curObj->MaxLod != 1000.0) {

+               /* apply LOD clamping to lambda */

+               const GLfloat min = curObj->MinLod;

+               const GLfloat max = curObj->MaxLod;

+               GLuint i;

+               for (i = 0; i < span->end; i++) {

+                  GLfloat l = lambda[i];

+                  lambda[i] = CLAMP(l, min, max);

+               }

+            }

+         }

+

+         /* Sample the texture (span->end = number of fragments) */

+         swrast->TextureSample[unit]( ctx, texUnit->_Current, span->end,

+                                      texcoords, lambda, texels );

+

+         /* GL_SGI_texture_color_table */

+         if (texUnit->ColorTableEnabled) {

+            _mesa_lookup_rgba_float(&texUnit->ColorTable, span->end, texels);

+         }

+

+         /* GL_EXT_texture_swizzle */

+         if (curObj->_Swizzle != SWIZZLE_NOOP) {

+            swizzle_texels(curObj->_Swizzle, span->end, texels);

+         }

+      }

+   }

+

+   /*

+    * OK, now apply the texture (aka texture combine/blend).

+    * We modify the span->color.rgba values.

+    */

+   for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {

+      if (ctx->Texture.Unit[unit]._ReallyEnabled) {

+         texture_combine( ctx, unit, span->end,

+                          primary_rgba,

+                          swrast->TexelBuffer,

+                          span->array->rgba );

+      }

+   }

+

+   free(primary_rgba);

+}