mesa: texture combine clean-ups

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

3 files changed, 40 insertions, 38 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index e77dd1d226a..c1f06885ec4 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1338,18 +1338,23 @@ struct gl_texture_object
 };
 
 
+/** 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 */
diff --git a/src/mesa/main/texenv.c b/src/mesa/main/texenv.c
index c2960fc8208..4d511f2f7ed 100644
--- a/src/mesa/main/texenv.c
+++ b/src/mesa/main/texenv.c
@@ -184,7 +184,7 @@ set_combiner_source(GLcontext *ctx,
                     struct gl_texture_unit *texUnit,
                     GLenum pname, GLenum param)
 {
-   GLuint src;
+   GLuint term;
    GLboolean alpha, legal;
 
    if (!ctx->Extensions.EXT_texture_env_combine &&
@@ -194,24 +194,24 @@ set_combiner_source(GLcontext *ctx,
    }
 
    /*
-    * 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 {
@@ -220,20 +220,20 @@ set_combiner_source(GLcontext *ctx,
       }
       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 {
@@ -246,7 +246,7 @@ set_combiner_source(GLcontext *ctx,
       return;
    }
 
-   assert(src < 4);
+   assert(term < MAX_COMBINER_TERMS);
 
    /*
     * Error-check param (the source term)
@@ -288,9 +288,9 @@ set_combiner_source(GLcontext *ctx,
    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;
 }
 
 
@@ -300,7 +300,7 @@ set_combiner_operand(GLcontext *ctx,
                      struct gl_texture_unit *texUnit,
                      GLenum pname, GLenum param)
 {
-   GLuint op;
+   GLuint term;
    GLboolean alpha, legal;
 
    if (!ctx->Extensions.EXT_texture_env_combine &&
@@ -311,16 +311,16 @@ set_combiner_operand(GLcontext *ctx,
 
    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 {
@@ -330,7 +330,7 @@ set_combiner_operand(GLcontext *ctx,
       break;
    case GL_OPERAND3_RGB_NV:
       if (ctx->Extensions.NV_texture_env_combine4) {
-         op = 3;
+         term = 3;
          alpha = GL_FALSE;
       }
       else {
@@ -339,16 +339,16 @@ set_combiner_operand(GLcontext *ctx,
       }
       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 {
@@ -358,7 +358,7 @@ set_combiner_operand(GLcontext *ctx,
       break;
    case GL_OPERAND3_ALPHA_NV:
       if (ctx->Extensions.NV_texture_env_combine4) {
-         op = 3;
+         term = 3;
          alpha = GL_TRUE;
       }
       else {
@@ -371,7 +371,7 @@ set_combiner_operand(GLcontext *ctx,
       return;
    }
 
-   assert(op < 4);
+   assert(term < MAX_COMBINER_TERMS);
 
    /*
     * Error-check param (the source operand)
@@ -397,9 +397,9 @@ set_combiner_operand(GLcontext *ctx,
    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;
 }
 
 
diff --git a/src/mesa/main/texenvprogram.c b/src/mesa/main/texenvprogram.c
index 3fbd119b347..4a124bf27e2 100644
--- a/src/mesa/main/texenvprogram.c
+++ b/src/mesa/main/texenvprogram.c
@@ -39,9 +39,6 @@
 #include "texenvprogram.h"
 
 
-#define MAX_TERMS 4
-
-
 /*
  * Note on texture units:
  *
@@ -95,11 +92,11 @@ struct state_key {
 
       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];
 };
 
@@ -389,7 +386,7 @@ static void make_state_key( GLcontext *ctx,  struct state_key *key )
       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 =
@@ -972,11 +969,11 @@ static struct ureg emit_combine( struct texenv_fragment_program *p,
 				 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) */