mesa: texture combine clean-ups

Use MAX_COMBINER_TERMS instead of 4.
Rename some vars.
Update comments.

src/mesa/main/mtypes.h

 };
 
 
+/** Up to four combiner sources are possible with GL_NV_texture_env_combine4 */
+#define MAX_COMBINER_TERMS 4
+
+
 /**
  * Texture combine environment state.
- * Up to four combiner sources are possible with GL_NV_texture_env_combine4.
  */
 struct gl_tex_env_combine_state
 {
    GLenum ModeRGB;       /**< GL_REPLACE, GL_DECAL, GL_ADD, etc. */
    GLenum ModeA;         /**< GL_REPLACE, GL_DECAL, GL_ADD, etc. */
-   GLenum SourceRGB[4];  /**< GL_PRIMARY_COLOR, GL_TEXTURE, etc. */
-   GLenum SourceA[4];    /**< GL_PRIMARY_COLOR, GL_TEXTURE, etc. */
-   GLenum OperandRGB[4]; /**< SRC_COLOR, ONE_MINUS_SRC_COLOR, etc */
-   GLenum OperandA[4];   /**< SRC_ALPHA, ONE_MINUS_SRC_ALPHA, etc */
+   /** Source terms: GL_PRIMARY_COLOR, GL_TEXTURE, etc */
+   GLenum SourceRGB[MAX_COMBINER_TERMS];
+   GLenum SourceA[MAX_COMBINER_TERMS];
+   /** Source operands: GL_SRC_COLOR, GL_ONE_MINUS_SRC_COLOR, etc */
+   GLenum OperandRGB[MAX_COMBINER_TERMS];
+   GLenum OperandA[MAX_COMBINER_TERMS];
    GLuint ScaleShiftRGB; /**< 0, 1 or 2 */
    GLuint ScaleShiftA;   /**< 0, 1 or 2 */
    GLuint _NumArgsRGB;   /**< Number of inputs used for the RGB combiner */

src/mesa/main/texenv.c

                     struct gl_texture_unit *texUnit,
                     GLenum pname, GLenum param)
 {
-   GLuint src;
+   GLuint term;
    GLboolean alpha, legal;
 
    if (!ctx->Extensions.EXT_texture_env_combine &&
    }
 
    /*
-    * Translate pname to (src, alpha).
+    * Translate pname to (term, alpha).
     */
    switch (pname) {
    case GL_SOURCE0_RGB:
-      src = 0;
+      term = 0;
       alpha = GL_FALSE;
       break;
    case GL_SOURCE1_RGB:
-      src = 1;
+      term = 1;
       alpha = GL_FALSE;
       break;
    case GL_SOURCE2_RGB:
-      src = 2;
+      term = 2;
       alpha = GL_FALSE;
       break;
    case GL_SOURCE3_RGB_NV:
       if (ctx->Extensions.NV_texture_env_combine4) {
-         src = 3;
+         term = 3;
          alpha = GL_FALSE;
       }
       else {
       }
       break;
    case GL_SOURCE0_ALPHA:
-      src = 0;
+      term = 0;
       alpha = GL_TRUE;
       break;
    case GL_SOURCE1_ALPHA:
-      src = 1;
+      term = 1;
       alpha = GL_TRUE;
       break;
    case GL_SOURCE2_ALPHA:
-      src = 2;
+      term = 2;
       alpha = GL_TRUE;
       break;
    case GL_SOURCE3_ALPHA_NV:
       if (ctx->Extensions.NV_texture_env_combine4) {
-         src = 3;
+         term = 3;
          alpha = GL_TRUE;
       }
       else {
       return;
    }
 
-   assert(src < 4);
+   assert(term < MAX_COMBINER_TERMS);
 
    /*
     * Error-check param (the source term)
    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 
    if (alpha)
-      texUnit->Combine.SourceA[src] = param;
+      texUnit->Combine.SourceA[term] = param;
    else
-      texUnit->Combine.SourceRGB[src] = param;
+      texUnit->Combine.SourceRGB[term] = param;
 }
 
 
                      struct gl_texture_unit *texUnit,
                      GLenum pname, GLenum param)
 {
-   GLuint op;
+   GLuint term;
    GLboolean alpha, legal;
 
    if (!ctx->Extensions.EXT_texture_env_combine &&
 
    switch (pname) {
    case GL_OPERAND0_RGB:
-      op = 0;
+      term = 0;
       alpha = GL_FALSE;
       break;
    case GL_OPERAND1_RGB:
-      op = 1;
+      term = 1;
       alpha = GL_FALSE;
       break;
    case GL_OPERAND2_RGB:
       if (ctx->Extensions.ARB_texture_env_combine) {
-         op = 2;
+         term = 2;
          alpha = GL_FALSE;
       }
       else {
       break;
    case GL_OPERAND3_RGB_NV:
       if (ctx->Extensions.NV_texture_env_combine4) {
-         op = 3;
+         term = 3;
          alpha = GL_FALSE;
       }
       else {
       }
       break;
    case GL_OPERAND0_ALPHA:
-      op = 0;
+      term = 0;
       alpha = GL_TRUE;
       break;
    case GL_OPERAND1_ALPHA:
-      op = 1;
+      term = 1;
       alpha = GL_TRUE;
       break;
    case GL_OPERAND2_ALPHA:
       if (ctx->Extensions.ARB_texture_env_combine) {
-         op = 2;
+         term = 2;
          alpha = GL_TRUE;
       }
       else {
       break;
    case GL_OPERAND3_ALPHA_NV:
       if (ctx->Extensions.NV_texture_env_combine4) {
-         op = 3;
+         term = 3;
          alpha = GL_TRUE;
       }
       else {
       return;
    }
 
-   assert(op < 4);
+   assert(term < MAX_COMBINER_TERMS);
 
    /*
     * Error-check param (the source operand)
    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 
    if (alpha)
-      texUnit->Combine.OperandA[op] = param;
+      texUnit->Combine.OperandA[term] = param;
    else
-      texUnit->Combine.OperandRGB[op] = param;
+      texUnit->Combine.OperandRGB[term] = param;
 }
 
 

src/mesa/main/texenvprogram.c

 #include "texenvprogram.h"
 
 
-#define MAX_TERMS 4
-
-
 /*
  * Note on texture units:
  *
 
       GLuint NumArgsRGB:3;
       GLuint ModeRGB:5;
-      struct mode_opt OptRGB[MAX_TERMS];
+      struct mode_opt OptRGB[MAX_COMBINER_TERMS];
 
       GLuint NumArgsA:3;
       GLuint ModeA:5;
-      struct mode_opt OptA[MAX_TERMS];
+      struct mode_opt OptA[MAX_COMBINER_TERMS];
    } unit[8];
 };
 
       key->unit[i].ScaleShiftRGB = texUnit->_CurrentCombine->ScaleShiftRGB;
       key->unit[i].ScaleShiftA = texUnit->_CurrentCombine->ScaleShiftA;
 
-      for (j = 0; j < MAX_TERMS; j++) {
+      for (j = 0; j < MAX_COMBINER_TERMS; j++) {
          key->unit[i].OptRGB[j].Operand =
 	    translate_operand(texUnit->_CurrentCombine->OperandRGB[j]);
          key->unit[i].OptA[j].Operand =
 				 GLuint mode,
 				 const struct mode_opt *opt)
 {
-   struct ureg src[MAX_TERMS];
+   struct ureg src[MAX_COMBINER_TERMS];
    struct ureg tmp, half;
    GLuint i;
 
-   assert(nr <= MAX_TERMS);
+   assert(nr <= MAX_COMBINER_TERMS);
 
    tmp = undef; /* silence warning (bug 5318) */
 

src/mesa/swrast/s_fragprog.c

 
       lambda = CLAMP(lambda, texObj->MinLod, texObj->MaxLod);
 
-      /* XXX use a float-valued TextureSample routine here!!! */
       swrast->TextureSample[unit](ctx, texObj, 1,
                                   (const GLfloat (*)[4]) texcoord,
                                   &lambda, &rgba);
 
       lambda = CLAMP(lambda, texObj->MinLod, texObj->MaxLod);
 
-      /* XXX use a float-valued TextureSample routine here!!! */
       swrast->TextureSample[unit](ctx, texObj, 1,
                                   (const GLfloat (*)[4]) texcoord,
                                   &lambda, &rgba);

src/mesa/swrast/s_texcombine.c

 #include "s_texcombine.h"
 
 
-#define MAX_COMBINER_TERMS 4
-
-
 /**
- * Do texture application for GL_ARB/EXT_texture_env_combine.
- * This function also supports GL_{EXT,ARB}_texture_env_dot3 and
- * GL_ATI_texture_env_combine3.  Since "classic" texture environments are
- * implemented using GL_ARB_texture_env_combine-like state, this same function
- * is used for classic texture environment application as well.
+ * 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 textureUnit  the texture unit to apply
+ * \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 colors, which get modified here
+ * \param rgba         incoming/result fragment colors
  */
 static void
 texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
    const struct gl_tex_env_combine_state *combine = textureUnit->_CurrentCombine;
    const GLfloat (*argRGB [MAX_COMBINER_TERMS])[4];
    const GLfloat (*argA [MAX_COMBINER_TERMS])[4];
-   const GLfloat RGBmult = (GLfloat) (1 << combine->ScaleShiftRGB);
-   const GLfloat Amult = (GLfloat) (1 << combine->ScaleShiftA);
-   const GLuint numColorArgs = combine->_NumArgsRGB;
-   const GLuint numAlphaArgs = combine->_NumArgsA;
+   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;
 
-   ASSERT(ctx->Extensions.EXT_texture_env_combine ||
-          ctx->Extensions.ARB_texture_env_combine);
    ASSERT(CONST_SWRAST_CONTEXT(ctx)->_AnyTextureCombine);
 
    for (i = 0; i < n; i++) {
    /*
     * Do operand setup for up to 4 operands.  Loop over the terms.
     */
-   for (term = 0; term < numColorArgs; term++) {
+   for (term = 0; term < numArgsRGB; term++) {
       const GLenum srcRGB = combine->SourceRGB[term];
       const GLenum operandRGB = combine->OperandRGB[term];
 
    }
 
    /*
-    * Set up the argA[i] pointers
+    * Set up the argA[term] pointers
     */
-   for (term = 0; term < numAlphaArgs; term++) {
+   for (term = 0; term < numArgsA; term++) {
       const GLenum srcA = combine->SourceA[term];
       const GLenum operandA = combine->OperandA[term];
 
       switch (combine->ModeRGB) {
       case GL_REPLACE:
          for (i = 0; i < n; i++) {
-            rgba[i][RCOMP] = arg0[i][RCOMP] * RGBmult;
-            rgba[i][GCOMP] = arg0[i][GCOMP] * RGBmult;
-            rgba[i][BCOMP] = arg0[i][BCOMP] * RGBmult;
+            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] * RGBmult;
-            rgba[i][GCOMP] = arg0[i][GCOMP] * arg1[i][GCOMP] * RGBmult;
-            rgba[i][BCOMP] = arg0[i][BCOMP] * arg1[i][BCOMP] * RGBmult;
+            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:
             /* (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]) * RGBmult;
+                                 arg2[i][RCOMP] * arg3[i][RCOMP]) * scaleRGB;
                rgba[i][GCOMP] = (arg0[i][GCOMP] * arg1[i][GCOMP] +
-                                 arg2[i][GCOMP] * arg3[i][GCOMP]) * RGBmult;
+                                 arg2[i][GCOMP] * arg3[i][GCOMP]) * scaleRGB;
                rgba[i][BCOMP] = (arg0[i][BCOMP] * arg1[i][BCOMP] +
-                                 arg2[i][BCOMP] * arg3[i][BCOMP]) * RGBmult;
+                                 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]) * RGBmult;
-               rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP]) * RGBmult;
-               rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP]) * RGBmult;
+               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;
             /* (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] - 0.5) * RGBmult;
+                                 arg2[i][RCOMP] + arg3[i][RCOMP] - 0.5) * scaleRGB;
                rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] *
-                                 arg2[i][GCOMP] + arg3[i][GCOMP] - 0.5) * RGBmult;
+                                 arg2[i][GCOMP] + arg3[i][GCOMP] - 0.5) * scaleRGB;
                rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] *
-                                 arg2[i][BCOMP] + arg3[i][BCOMP] - 0.5) * RGBmult;
+                                 arg2[i][BCOMP] + arg3[i][BCOMP] - 0.5) * scaleRGB;
             }
          }
          else {
             for (i = 0; i < n; i++) {
-               rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP] - 0.5) * RGBmult;
-               rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] - 0.5) * RGBmult;
-               rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] - 0.5) * RGBmult;
+               rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP] - 0.5) * scaleRGB;
+               rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] - 0.5) * scaleRGB;
+               rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] - 0.5) * 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])) * RGBmult;
+                          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])) * RGBmult;
+                          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])) * RGBmult;
+                          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]) * RGBmult;
-            rgba[i][GCOMP] = (arg0[i][GCOMP] - arg1[i][GCOMP]) * RGBmult;
-            rgba[i][BCOMP] = (arg0[i][BCOMP] - arg1[i][BCOMP]) * RGBmult;
+            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))
+            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] = (GLfloat) dot;
       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 * RGBmult;
+            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, 0.0, 1.0F);
             rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLfloat) dot;
          }
       case GL_MODULATE_ADD_ATI:
          for (i = 0; i < n; i++) {
             rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) +
-                              arg1[i][RCOMP]) * RGBmult;
+                              arg1[i][RCOMP]) * scaleRGB;
             rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) +
-                              arg1[i][GCOMP]) * RGBmult;
+                              arg1[i][GCOMP]) * scaleRGB;
             rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) +
-                              arg1[i][BCOMP]) * RGBmult;
+                              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] - 0.5) * RGBmult;
+                              arg1[i][RCOMP] - 0.5) * scaleRGB;
             rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) +
-                              arg1[i][GCOMP] - 0.5) * RGBmult;
+                              arg1[i][GCOMP] - 0.5) * scaleRGB;
             rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) +
-                              arg1[i][BCOMP] - 0.5) * RGBmult;
+                              arg1[i][BCOMP] - 0.5) * 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]) * RGBmult;
+                              arg1[i][RCOMP]) * scaleRGB;
             rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) -
-                              arg1[i][GCOMP]) * RGBmult;
+                              arg1[i][GCOMP]) * scaleRGB;
             rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) -
-                              arg1[i][BCOMP]) * RGBmult;
+                              arg1[i][BCOMP]) * scaleRGB;
 	 }
          break;
       case GL_BUMP_ENVMAP_ATI:
       switch (combine->ModeA) {
       case GL_REPLACE:
          for (i = 0; i < n; i++) {
-            GLfloat a = arg0[i][ACOMP] * Amult;
+            GLfloat a = arg0[i][ACOMP] * scaleA;
             rgba[i][ACOMP] = (GLfloat) MIN2(a, 1.0F);
          }
          break;
       case GL_MODULATE:
          for (i = 0; i < n; i++) {
-            rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * Amult;
+            rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * scaleA;
          }
          break;
       case GL_ADD:
             /* (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]) * Amult;
+                                 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]) * Amult;
+               rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP]) * scaleA;
             }
          }
          break;
             for (i = 0; i < n; i++) {
                rgba[i][ACOMP] = (arg0[i][ACOMP] * arg1[i][ACOMP] +
                                  arg2[i][ACOMP] * arg3[i][ACOMP] -
-                                 0.5) * Amult;
+                                 0.5) * scaleA;
             }
          }
          else {
             /* a + b - 0.5 */
             for (i = 0; i < n; i++) {
-               rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * Amult;
+               rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * scaleA;
             }
          }
          break;
          for (i=0; i<n; i++) {
             rgba[i][ACOMP] = (arg0[i][ACOMP] * arg2[i][ACOMP] +
                               arg1[i][ACOMP] * (1.0F - arg2[i][ACOMP]))
-               * Amult;
+               * scaleA;
          }
          break;
       case GL_SUBTRACT:
          for (i = 0; i < n; i++) {
-            rgba[i][ACOMP] = (arg0[i][ACOMP] - arg1[i][ACOMP]) * Amult;
+            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]) * Amult;
+                              + 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) * Amult;
+                              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]) * Amult;
+                              - arg1[i][ACOMP]) * scaleA;
          }
          break;
       default:
 	 }
 	 break;
 
-     /* XXX don't clamp results if GLfloat is float??? */
-
       case GL_ADD:  /* GL_EXT_texture_add_env */
          switch (format) {
             case GL_ALPHA: