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path: root/src/mesa/swrast/s_texcombine.c
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Diffstat (limited to 'src/mesa/swrast/s_texcombine.c')
-rw-r--r--src/mesa/swrast/s_texcombine.c140
1 files changed, 68 insertions, 72 deletions
diff --git a/src/mesa/swrast/s_texcombine.c b/src/mesa/swrast/s_texcombine.c
index 27c5c15cf16..76b95e8ae7a 100644
--- a/src/mesa/swrast/s_texcombine.c
+++ b/src/mesa/swrast/s_texcombine.c
@@ -37,23 +37,23 @@
#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,
@@ -65,16 +65,14 @@ 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++) {
@@ -97,7 +95,7 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
/*
* 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];
@@ -193,9 +191,9 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
}
/*
- * 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];
@@ -269,16 +267,16 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
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:
@@ -286,19 +284,19 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
/* (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;
@@ -307,45 +305,45 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
/* (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;
@@ -355,10 +353,10 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
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;
}
@@ -366,31 +364,31 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
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:
@@ -427,13 +425,13 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
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:
@@ -441,13 +439,13 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
/* (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;
@@ -457,13 +455,13 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
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;
@@ -471,30 +469,30 @@ texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
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:
@@ -841,8 +839,6 @@ texture_apply( const GLcontext *ctx,
}
break;
- /* XXX don't clamp results if GLfloat is float??? */
-
case GL_ADD: /* GL_EXT_texture_add_env */
switch (format) {
case GL_ALPHA:
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 05:53:38 +0000