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-rw-r--r--dist/Mesa/src/mesa/swrast/s_texcombine.c1164
1 files changed, 1164 insertions, 0 deletions
diff --git a/dist/Mesa/src/mesa/swrast/s_texcombine.c b/dist/Mesa/src/mesa/swrast/s_texcombine.c
new file mode 100644
index 000000000..ac26c9ceb
--- /dev/null
+++ b/dist/Mesa/src/mesa/swrast/s_texcombine.c
@@ -0,0 +1,1164 @@
+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5.1
+ *
+ * Copyright (C) 1999-2006 Brian Paul 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 "glheader.h"
+#include "context.h"
+#include "colormac.h"
+#include "imports.h"
+#include "macros.h"
+#include "pixel.h"
+
+#include "s_context.h"
+#include "s_texcombine.h"
+
+
+#define PROD(A,B) ( (GLuint)(A) * ((GLuint)(B)+1) )
+#define S_PROD(A,B) ( (GLint)(A) * ((GLint)(B)+1) )
+#if CHAN_BITS == 32
+typedef GLfloat ChanTemp;
+#else
+typedef GLuint ChanTemp;
+#endif
+
+
+/**
+ * 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.
+ *
+ * \param ctx rendering context
+ * \param textureUnit the texture unit to apply
+ * \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
+ */
+static void
+texture_combine( const GLcontext *ctx, GLuint unit, GLuint n,
+ CONST GLchan (*primary_rgba)[4],
+ CONST GLchan *texelBuffer,
+ GLchan (*rgba)[4] )
+{
+ const struct gl_texture_unit *textureUnit = &(ctx->Texture.Unit[unit]);
+ const GLchan (*argRGB [3])[4];
+ const GLchan (*argA [3])[4];
+ const GLuint RGBshift = textureUnit->_CurrentCombine->ScaleShiftRGB;
+ const GLuint Ashift = textureUnit->_CurrentCombine->ScaleShiftA;
+#if CHAN_TYPE == GL_FLOAT
+ const GLchan RGBmult = (GLfloat) (1 << RGBshift);
+ const GLchan Amult = (GLfloat) (1 << Ashift);
+#else
+ const GLint half = (CHAN_MAX + 1) / 2;
+#endif
+ static const GLchan one[4] = { CHAN_MAX, CHAN_MAX, CHAN_MAX, CHAN_MAX };
+ static const GLchan zero[4] = { 0, 0, 0, 0 };
+ const GLuint numColorArgs = textureUnit->_CurrentCombine->_NumArgsRGB;
+ const GLuint numAlphaArgs = textureUnit->_CurrentCombine->_NumArgsA;
+ GLchan ccolor[3][MAX_WIDTH][4];
+ GLuint i, j;
+
+ ASSERT(ctx->Extensions.EXT_texture_env_combine ||
+ ctx->Extensions.ARB_texture_env_combine);
+ ASSERT(SWRAST_CONTEXT(ctx)->_AnyTextureCombine);
+
+ /*
+ printf("modeRGB 0x%x modeA 0x%x srcRGB1 0x%x srcA1 0x%x srcRGB2 0x%x srcA2 0x%x\n",
+ textureUnit->_CurrentCombine->ModeRGB,
+ textureUnit->_CurrentCombine->ModeA,
+ textureUnit->_CurrentCombine->SourceRGB[0],
+ textureUnit->_CurrentCombine->SourceA[0],
+ textureUnit->_CurrentCombine->SourceRGB[1],
+ textureUnit->_CurrentCombine->SourceA[1]);
+ */
+
+ /*
+ * Do operand setup for up to 3 operands. Loop over the terms.
+ */
+ for (j = 0; j < numColorArgs; j++) {
+ const GLenum srcRGB = textureUnit->_CurrentCombine->SourceRGB[j];
+
+ switch (srcRGB) {
+ case GL_TEXTURE:
+ argRGB[j] = (const GLchan (*)[4])
+ (texelBuffer + unit * (n * 4 * sizeof(GLchan)));
+ break;
+ case GL_PRIMARY_COLOR:
+ argRGB[j] = primary_rgba;
+ break;
+ case GL_PREVIOUS:
+ argRGB[j] = (const GLchan (*)[4]) rgba;
+ break;
+ case GL_CONSTANT:
+ {
+ GLchan (*c)[4] = ccolor[j];
+ GLchan red, green, blue, alpha;
+ UNCLAMPED_FLOAT_TO_CHAN(red, textureUnit->EnvColor[0]);
+ UNCLAMPED_FLOAT_TO_CHAN(green, textureUnit->EnvColor[1]);
+ UNCLAMPED_FLOAT_TO_CHAN(blue, textureUnit->EnvColor[2]);
+ UNCLAMPED_FLOAT_TO_CHAN(alpha, textureUnit->EnvColor[3]);
+ for (i = 0; i < n; i++) {
+ c[i][RCOMP] = red;
+ c[i][GCOMP] = green;
+ c[i][BCOMP] = blue;
+ c[i][ACOMP] = alpha;
+ }
+ argRGB[j] = (const GLchan (*)[4]) ccolor[j];
+ }
+ break;
+ /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
+ */
+ case GL_ZERO:
+ argRGB[j] = & zero;
+ break;
+ case GL_ONE:
+ argRGB[j] = & one;
+ 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[j] = (const GLchan (*)[4])
+ (texelBuffer + srcUnit * (n * 4 * sizeof(GLchan)));
+ }
+ }
+
+ if (textureUnit->_CurrentCombine->OperandRGB[j] != GL_SRC_COLOR) {
+ const GLchan (*src)[4] = argRGB[j];
+ GLchan (*dst)[4] = ccolor[j];
+
+ /* point to new arg[j] storage */
+ argRGB[j] = (const GLchan (*)[4]) ccolor[j];
+
+ if (textureUnit->_CurrentCombine->OperandRGB[j] == GL_ONE_MINUS_SRC_COLOR) {
+ for (i = 0; i < n; i++) {
+ dst[i][RCOMP] = CHAN_MAX - src[i][RCOMP];
+ dst[i][GCOMP] = CHAN_MAX - src[i][GCOMP];
+ dst[i][BCOMP] = CHAN_MAX - src[i][BCOMP];
+ }
+ }
+ else if (textureUnit->_CurrentCombine->OperandRGB[j] == GL_SRC_ALPHA) {
+ for (i = 0; i < n; i++) {
+ dst[i][RCOMP] = src[i][ACOMP];
+ dst[i][GCOMP] = src[i][ACOMP];
+ dst[i][BCOMP] = src[i][ACOMP];
+ }
+ }
+ else {
+ ASSERT(textureUnit->_CurrentCombine->OperandRGB[j] ==GL_ONE_MINUS_SRC_ALPHA);
+ for (i = 0; i < n; i++) {
+ dst[i][RCOMP] = CHAN_MAX - src[i][ACOMP];
+ dst[i][GCOMP] = CHAN_MAX - src[i][ACOMP];
+ dst[i][BCOMP] = CHAN_MAX - src[i][ACOMP];
+ }
+ }
+ }
+ }
+
+ /*
+ * Set up the argA[i] pointers
+ */
+ for (j = 0; j < numAlphaArgs; j++) {
+ const GLenum srcA = textureUnit->_CurrentCombine->SourceA[j];
+
+ switch (srcA) {
+ case GL_TEXTURE:
+ argA[j] = (const GLchan (*)[4])
+ (texelBuffer + unit * (n * 4 * sizeof(GLchan)));
+ break;
+ case GL_PRIMARY_COLOR:
+ argA[j] = primary_rgba;
+ break;
+ case GL_PREVIOUS:
+ argA[j] = (const GLchan (*)[4]) rgba;
+ break;
+ case GL_CONSTANT:
+ {
+ GLchan alpha, (*c)[4] = ccolor[j];
+ UNCLAMPED_FLOAT_TO_CHAN(alpha, textureUnit->EnvColor[3]);
+ for (i = 0; i < n; i++)
+ c[i][ACOMP] = alpha;
+ argA[j] = (const GLchan (*)[4]) ccolor[j];
+ }
+ break;
+ /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
+ */
+ case GL_ZERO:
+ argA[j] = & zero;
+ break;
+ case GL_ONE:
+ argA[j] = & one;
+ 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[j] = (const GLchan (*)[4])
+ (texelBuffer + srcUnit * (n * 4 * sizeof(GLchan)));
+ }
+ }
+
+ if (textureUnit->_CurrentCombine->OperandA[j] == GL_ONE_MINUS_SRC_ALPHA) {
+ const GLchan (*src)[4] = argA[j];
+ GLchan (*dst)[4] = ccolor[j];
+ argA[j] = (const GLchan (*)[4]) ccolor[j];
+ for (i = 0; i < n; i++) {
+ dst[i][ACOMP] = CHAN_MAX - src[i][ACOMP];
+ }
+ }
+ }
+
+ /*
+ * Do the texture combine.
+ */
+ switch (textureUnit->_CurrentCombine->ModeRGB) {
+ case GL_REPLACE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ if (RGBshift) {
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = arg0[i][RCOMP] * RGBmult;
+ rgba[i][GCOMP] = arg0[i][GCOMP] * RGBmult;
+ rgba[i][BCOMP] = arg0[i][BCOMP] * RGBmult;
+#else
+ GLuint r = (GLuint) arg0[i][RCOMP] << RGBshift;
+ GLuint g = (GLuint) arg0[i][GCOMP] << RGBshift;
+ GLuint b = (GLuint) arg0[i][BCOMP] << RGBshift;
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = arg0[i][RCOMP];
+ rgba[i][GCOMP] = arg0[i][GCOMP];
+ rgba[i][BCOMP] = arg0[i][BCOMP];
+ }
+ }
+ }
+ break;
+ case GL_MODULATE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ 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;
+#else
+ GLuint r = PROD(arg0[i][RCOMP], arg1[i][RCOMP]) >> shift;
+ GLuint g = PROD(arg0[i][GCOMP], arg1[i][GCOMP]) >> shift;
+ GLuint b = PROD(arg0[i][BCOMP], arg1[i][BCOMP]) >> shift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_ADD:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ 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;
+#else
+ GLint r = ((GLint) arg0[i][RCOMP] + (GLint) arg1[i][RCOMP]) << RGBshift;
+ GLint g = ((GLint) arg0[i][GCOMP] + (GLint) arg1[i][GCOMP]) << RGBshift;
+ GLint b = ((GLint) arg0[i][BCOMP] + (GLint) arg1[i][BCOMP]) << RGBshift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_ADD_SIGNED:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ 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;
+#else
+ GLint r = (GLint) arg0[i][RCOMP] + (GLint) arg1[i][RCOMP] -half;
+ GLint g = (GLint) arg0[i][GCOMP] + (GLint) arg1[i][GCOMP] -half;
+ GLint b = (GLint) arg0[i][BCOMP] + (GLint) arg1[i][BCOMP] -half;
+ r = (r < 0) ? 0 : r << RGBshift;
+ g = (g < 0) ? 0 : g << RGBshift;
+ b = (b < 0) ? 0 : b << RGBshift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_INTERPOLATE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = (arg0[i][RCOMP] * arg2[i][RCOMP] +
+ arg1[i][RCOMP] * (CHAN_MAXF - arg2[i][RCOMP])) * RGBmult;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] * arg2[i][GCOMP] +
+ arg1[i][GCOMP] * (CHAN_MAXF - arg2[i][GCOMP])) * RGBmult;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] * arg2[i][BCOMP] +
+ arg1[i][BCOMP] * (CHAN_MAXF - arg2[i][BCOMP])) * RGBmult;
+#else
+ GLuint r = (PROD(arg0[i][RCOMP], arg2[i][RCOMP])
+ + PROD(arg1[i][RCOMP], CHAN_MAX - arg2[i][RCOMP]))
+ >> shift;
+ GLuint g = (PROD(arg0[i][GCOMP], arg2[i][GCOMP])
+ + PROD(arg1[i][GCOMP], CHAN_MAX - arg2[i][GCOMP]))
+ >> shift;
+ GLuint b = (PROD(arg0[i][BCOMP], arg2[i][BCOMP])
+ + PROD(arg1[i][BCOMP], CHAN_MAX - arg2[i][BCOMP]))
+ >> shift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_SUBTRACT:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ 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;
+#else
+ GLint r = ((GLint) arg0[i][RCOMP] - (GLint) arg1[i][RCOMP]) << RGBshift;
+ GLint g = ((GLint) arg0[i][GCOMP] - (GLint) arg1[i][GCOMP]) << RGBshift;
+ GLint b = ((GLint) arg0[i][BCOMP] - (GLint) arg1[i][BCOMP]) << RGBshift;
+ rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_DOT3_RGB_EXT:
+ case GL_DOT3_RGBA_EXT:
+ {
+ /* Do not scale the result by 1 2 or 4 */
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ GLchan 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, CHAN_MAXF);
+#else
+ GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - half,
+ (GLint)arg1[i][RCOMP] - half) +
+ S_PROD((GLint)arg0[i][GCOMP] - half,
+ (GLint)arg1[i][GCOMP] - half) +
+ S_PROD((GLint)arg0[i][BCOMP] - half,
+ (GLint)arg1[i][BCOMP] - half)) >> 6;
+ dot = CLAMP(dot, 0, CHAN_MAX);
+#endif
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot;
+ }
+ }
+ break;
+ case GL_DOT3_RGB:
+ case GL_DOT3_RGBA:
+ {
+ /* DO scale the result by 1 2 or 4 */
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ GLchan 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;
+ dot = CLAMP(dot, 0.0, CHAN_MAXF);
+#else
+ GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - half,
+ (GLint)arg1[i][RCOMP] - half) +
+ S_PROD((GLint)arg0[i][GCOMP] - half,
+ (GLint)arg1[i][GCOMP] - half) +
+ S_PROD((GLint)arg0[i][BCOMP] - half,
+ (GLint)arg1[i][BCOMP] - half)) >> 6;
+ dot <<= RGBshift;
+ dot = CLAMP(dot, 0, CHAN_MAX);
+#endif
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot;
+ }
+ }
+ break;
+ case GL_MODULATE_ADD_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) + arg1[i][RCOMP]) * RGBmult;
+ rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) + arg1[i][GCOMP]) * RGBmult;
+ rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) + arg1[i][BCOMP]) * RGBmult;
+#else
+ GLuint r = (PROD(arg0[i][RCOMP], arg2[i][RCOMP])
+ + ((GLuint) arg1[i][RCOMP] << CHAN_BITS)) >> shift;
+ GLuint g = (PROD(arg0[i][GCOMP], arg2[i][GCOMP])
+ + ((GLuint) arg1[i][GCOMP] << CHAN_BITS)) >> shift;
+ GLuint b = (PROD(arg0[i][BCOMP], arg2[i][BCOMP])
+ + ((GLuint) arg1[i][BCOMP] << CHAN_BITS)) >> shift;
+ rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_SIGNED_ADD_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) + arg1[i][RCOMP] - 0.5) * RGBmult;
+ rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) + arg1[i][GCOMP] - 0.5) * RGBmult;
+ rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) + arg1[i][BCOMP] - 0.5) * RGBmult;
+#else
+ GLint r = (S_PROD(arg0[i][RCOMP], arg2[i][RCOMP])
+ + (((GLint) arg1[i][RCOMP] - half) << CHAN_BITS))
+ >> shift;
+ GLint g = (S_PROD(arg0[i][GCOMP], arg2[i][GCOMP])
+ + (((GLint) arg1[i][GCOMP] - half) << CHAN_BITS))
+ >> shift;
+ GLint b = (S_PROD(arg0[i][BCOMP], arg2[i][BCOMP])
+ + (((GLint) arg1[i][BCOMP] - half) << CHAN_BITS))
+ >> shift;
+ rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_SUBTRACT_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - RGBshift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) - arg1[i][RCOMP]) * RGBmult;
+ rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) - arg1[i][GCOMP]) * RGBmult;
+ rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) - arg1[i][BCOMP]) * RGBmult;
+#else
+ GLint r = (S_PROD(arg0[i][RCOMP], arg2[i][RCOMP])
+ - ((GLint) arg1[i][RCOMP] << CHAN_BITS))
+ >> shift;
+ GLint g = (S_PROD(arg0[i][GCOMP], arg2[i][GCOMP])
+ - ((GLint) arg1[i][GCOMP] << CHAN_BITS))
+ >> shift;
+ GLint b = (S_PROD(arg0[i][BCOMP], arg2[i][BCOMP])
+ - ((GLint) arg1[i][BCOMP] << CHAN_BITS))
+ >> shift;
+ rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+ rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+ rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "invalid combine mode");
+ }
+
+ switch (textureUnit->_CurrentCombine->ModeA) {
+ case GL_REPLACE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ if (Ashift) {
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ GLchan a = arg0[i][ACOMP] * Amult;
+#else
+ GLuint a = (GLuint) arg0[i][ACOMP] << Ashift;
+#endif
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = arg0[i][ACOMP];
+ }
+ }
+ }
+ break;
+ case GL_MODULATE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * Amult;
+#else
+ GLuint a = (PROD(arg0[i][ACOMP], arg1[i][ACOMP]) >> shift);
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_ADD:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP]) * Amult;
+#else
+ GLint a = ((GLint) arg0[i][ACOMP] + arg1[i][ACOMP]) << Ashift;
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_ADD_SIGNED:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * Amult;
+#else
+ GLint a = (GLint) arg0[i][ACOMP] + (GLint) arg1[i][ACOMP] -half;
+ a = (a < 0) ? 0 : a << Ashift;
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_INTERPOLATE:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i=0; i<n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = (arg0[i][ACOMP] * arg2[i][ACOMP] +
+ arg1[i][ACOMP] * (CHAN_MAXF - arg2[i][ACOMP]))
+ * Amult;
+#else
+ GLuint a = (PROD(arg0[i][ACOMP], arg2[i][ACOMP])
+ + PROD(arg1[i][ACOMP], CHAN_MAX - arg2[i][ACOMP]))
+ >> shift;
+ rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_SUBTRACT:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = (arg0[i][ACOMP] - arg1[i][ACOMP]) * Amult;
+#else
+ GLint a = ((GLint) arg0[i][ACOMP] - (GLint) arg1[i][ACOMP]) << Ashift;
+ rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_ADD_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) + arg1[i][ACOMP]) * Amult;
+#else
+ GLint a = (PROD(arg0[i][ACOMP], arg2[i][ACOMP])
+ + ((GLuint) arg1[i][ACOMP] << CHAN_BITS))
+ >> shift;
+ rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_SIGNED_ADD_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) + arg1[i][ACOMP] - 0.5F) * Amult;
+#else
+ GLint a = (S_PROD(arg0[i][ACOMP], arg2[i][ACOMP])
+ + (((GLint) arg1[i][ACOMP] - half) << CHAN_BITS))
+ >> shift;
+ rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+#endif
+ }
+ }
+ break;
+ case GL_MODULATE_SUBTRACT_ATI:
+ {
+ const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0];
+ const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1];
+ const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2];
+#if CHAN_TYPE != GL_FLOAT
+ const GLint shift = CHAN_BITS - Ashift;
+#endif
+ for (i = 0; i < n; i++) {
+#if CHAN_TYPE == GL_FLOAT
+ rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) - arg1[i][ACOMP]) * Amult;
+#else
+ GLint a = (S_PROD(arg0[i][ACOMP], arg2[i][ACOMP])
+ - ((GLint) arg1[i][ACOMP] << CHAN_BITS))
+ >> shift;
+ rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+#endif
+ }
+ }
+ 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 (textureUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA_EXT ||
+ textureUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA) {
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = rgba[i][RCOMP];
+ }
+ }
+}
+#undef PROD
+
+
+/**
+ * Apply a conventional OpenGL texture env mode (REPLACE, ADD, BLEND,
+ * MODULATE, or DECAL) to an array of fragments.
+ * Input: textureUnit - pointer to texture unit to apply
+ * format - base internal texture format
+ * n - number of fragments
+ * primary_rgba - primary colors (may alias rgba for single texture)
+ * texels - array of texel colors
+ * InOut: rgba - incoming fragment colors modified by texel colors
+ * according to the texture environment mode.
+ */
+static void
+texture_apply( const GLcontext *ctx,
+ const struct gl_texture_unit *texUnit,
+ GLuint n,
+ CONST GLchan primary_rgba[][4], CONST GLchan texel[][4],
+ GLchan rgba[][4] )
+{
+ GLint baseLevel;
+ GLuint i;
+ GLchan Rc, Gc, Bc, Ac;
+ GLenum format;
+ (void) primary_rgba;
+
+ ASSERT(texUnit);
+ ASSERT(texUnit->_Current);
+
+ baseLevel = texUnit->_Current->BaseLevel;
+ ASSERT(texUnit->_Current->Image[0][baseLevel]);
+
+ format = texUnit->_Current->Image[0][baseLevel]->_BaseFormat;
+
+ if (format == GL_COLOR_INDEX || format == GL_YCBCR_MESA) {
+ format = GL_RGBA; /* a bit of a hack */
+ }
+ else if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) {
+ format = texUnit->_Current->DepthMode;
+ }
+
+ switch (texUnit->EnvMode) {
+ case GL_REPLACE:
+ switch (format) {
+ case GL_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf */
+ /* Av = At */
+ rgba[i][ACOMP] = texel[i][ACOMP];
+ }
+ break;
+ case GL_LUMINANCE:
+ for (i=0;i<n;i++) {
+ /* Cv = Lt */
+ GLchan Lt = texel[i][RCOMP];
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = Lt;
+ /* Av = Af */
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i=0;i<n;i++) {
+ GLchan Lt = texel[i][RCOMP];
+ /* Cv = Lt */
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = Lt;
+ /* Av = At */
+ rgba[i][ACOMP] = texel[i][ACOMP];
+ }
+ break;
+ case GL_INTENSITY:
+ for (i=0;i<n;i++) {
+ /* Cv = It */
+ GLchan It = texel[i][RCOMP];
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = It;
+ /* Av = It */
+ rgba[i][ACOMP] = It;
+ }
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ /* Cv = Ct */
+ rgba[i][RCOMP] = texel[i][RCOMP];
+ rgba[i][GCOMP] = texel[i][GCOMP];
+ rgba[i][BCOMP] = texel[i][BCOMP];
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ /* Cv = Ct */
+ rgba[i][RCOMP] = texel[i][RCOMP];
+ rgba[i][GCOMP] = texel[i][GCOMP];
+ rgba[i][BCOMP] = texel[i][BCOMP];
+ /* Av = At */
+ rgba[i][ACOMP] = texel[i][ACOMP];
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_REPLACE) in texture_apply");
+ return;
+ }
+ break;
+
+ case GL_MODULATE:
+ switch (format) {
+ case GL_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf */
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] );
+ }
+ break;
+ case GL_LUMINANCE:
+ for (i=0;i<n;i++) {
+ /* Cv = LtCf */
+ GLchan Lt = texel[i][RCOMP];
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], Lt );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], Lt );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], Lt );
+ /* Av = Af */
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = CfLt */
+ GLchan Lt = texel[i][RCOMP];
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], Lt );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], Lt );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], Lt );
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] );
+ }
+ break;
+ case GL_INTENSITY:
+ for (i=0;i<n;i++) {
+ /* Cv = CfIt */
+ GLchan It = texel[i][RCOMP];
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], It );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], It );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], It );
+ /* Av = AfIt */
+ rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], It );
+ }
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ /* Cv = CfCt */
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], texel[i][RCOMP] );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], texel[i][GCOMP] );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], texel[i][BCOMP] );
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ /* Cv = CfCt */
+ rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], texel[i][RCOMP] );
+ rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], texel[i][GCOMP] );
+ rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], texel[i][BCOMP] );
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] );
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_MODULATE) in texture_apply");
+ return;
+ }
+ break;
+
+ case GL_DECAL:
+ switch (format) {
+ case GL_ALPHA:
+ case GL_LUMINANCE:
+ case GL_LUMINANCE_ALPHA:
+ case GL_INTENSITY:
+ /* undefined */
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ /* Cv = Ct */
+ rgba[i][RCOMP] = texel[i][RCOMP];
+ rgba[i][GCOMP] = texel[i][GCOMP];
+ rgba[i][BCOMP] = texel[i][BCOMP];
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-At) + CtAt */
+ GLchan t = texel[i][ACOMP], s = CHAN_MAX - t;
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(texel[i][RCOMP],t);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(texel[i][GCOMP],t);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(texel[i][BCOMP],t);
+ /* Av = Af */
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_DECAL) in texture_apply");
+ return;
+ }
+ break;
+
+ case GL_BLEND:
+ UNCLAMPED_FLOAT_TO_CHAN(Rc, texUnit->EnvColor[0]);
+ UNCLAMPED_FLOAT_TO_CHAN(Gc, texUnit->EnvColor[1]);
+ UNCLAMPED_FLOAT_TO_CHAN(Bc, texUnit->EnvColor[2]);
+ UNCLAMPED_FLOAT_TO_CHAN(Ac, texUnit->EnvColor[3]);
+ switch (format) {
+ case GL_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf */
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
+ }
+ break;
+ case GL_LUMINANCE:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-Lt) + CcLt */
+ GLchan Lt = texel[i][RCOMP], s = CHAN_MAX - Lt;
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, Lt);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, Lt);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, Lt);
+ /* Av = Af */
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-Lt) + CcLt */
+ GLchan Lt = texel[i][RCOMP], s = CHAN_MAX - Lt;
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, Lt);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, Lt);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, Lt);
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP],texel[i][ACOMP]);
+ }
+ break;
+ case GL_INTENSITY:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-It) + CcIt */
+ GLchan It = texel[i][RCOMP], s = CHAN_MAX - It;
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, It);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, It);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, It);
+ /* Av = Af(1-It) + Ac*It */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], s) + CHAN_PRODUCT(Ac, It);
+ }
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-Ct) + CcCt */
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], (CHAN_MAX-texel[i][RCOMP])) + CHAN_PRODUCT(Rc,texel[i][RCOMP]);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], (CHAN_MAX-texel[i][GCOMP])) + CHAN_PRODUCT(Gc,texel[i][GCOMP]);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], (CHAN_MAX-texel[i][BCOMP])) + CHAN_PRODUCT(Bc,texel[i][BCOMP]);
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ /* Cv = Cf(1-Ct) + CcCt */
+ rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], (CHAN_MAX-texel[i][RCOMP])) + CHAN_PRODUCT(Rc,texel[i][RCOMP]);
+ rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], (CHAN_MAX-texel[i][GCOMP])) + CHAN_PRODUCT(Gc,texel[i][GCOMP]);
+ rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], (CHAN_MAX-texel[i][BCOMP])) + CHAN_PRODUCT(Bc,texel[i][BCOMP]);
+ /* Av = AfAt */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP],texel[i][ACOMP]);
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_BLEND) in texture_apply");
+ return;
+ }
+ break;
+
+ /* XXX don't clamp results if GLchan is float??? */
+
+ case GL_ADD: /* GL_EXT_texture_add_env */
+ switch (format) {
+ case GL_ALPHA:
+ for (i=0;i<n;i++) {
+ /* Rv = Rf */
+ /* Gv = Gf */
+ /* Bv = Bf */
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
+ }
+ break;
+ case GL_LUMINANCE:
+ for (i=0;i<n;i++) {
+ ChanTemp Lt = texel[i][RCOMP];
+ ChanTemp r = rgba[i][RCOMP] + Lt;
+ ChanTemp g = rgba[i][GCOMP] + Lt;
+ ChanTemp b = rgba[i][BCOMP] + Lt;
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ /* Av = Af */
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ for (i=0;i<n;i++) {
+ ChanTemp Lt = texel[i][RCOMP];
+ ChanTemp r = rgba[i][RCOMP] + Lt;
+ ChanTemp g = rgba[i][GCOMP] + Lt;
+ ChanTemp b = rgba[i][BCOMP] + Lt;
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
+ }
+ break;
+ case GL_INTENSITY:
+ for (i=0;i<n;i++) {
+ GLchan It = texel[i][RCOMP];
+ ChanTemp r = rgba[i][RCOMP] + It;
+ ChanTemp g = rgba[i][GCOMP] + It;
+ ChanTemp b = rgba[i][BCOMP] + It;
+ ChanTemp a = rgba[i][ACOMP] + It;
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ rgba[i][ACOMP] = MIN2(a, CHAN_MAX);
+ }
+ break;
+ case GL_RGB:
+ for (i=0;i<n;i++) {
+ ChanTemp r = rgba[i][RCOMP] + texel[i][RCOMP];
+ ChanTemp g = rgba[i][GCOMP] + texel[i][GCOMP];
+ ChanTemp b = rgba[i][BCOMP] + texel[i][BCOMP];
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ /* Av = Af */
+ }
+ break;
+ case GL_RGBA:
+ for (i=0;i<n;i++) {
+ ChanTemp r = rgba[i][RCOMP] + texel[i][RCOMP];
+ ChanTemp g = rgba[i][GCOMP] + texel[i][GCOMP];
+ ChanTemp b = rgba[i][BCOMP] + texel[i][BCOMP];
+ rgba[i][RCOMP] = MIN2(r, CHAN_MAX);
+ rgba[i][GCOMP] = MIN2(g, CHAN_MAX);
+ rgba[i][BCOMP] = MIN2(b, CHAN_MAX);
+ rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]);
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad format (GL_ADD) in texture_apply");
+ return;
+ }
+ break;
+
+ default:
+ _mesa_problem(ctx, "Bad env mode in texture_apply");
+ return;
+ }
+}
+
+
+
+/**
+ * Apply texture mapping to a span of fragments.
+ */
+void
+_swrast_texture_span( GLcontext *ctx, struct sw_span *span )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ GLchan primary_rgba[MAX_WIDTH][4];
+ GLuint unit;
+
+ ASSERT(span->end < MAX_WIDTH);
+ ASSERT(span->arrayMask & SPAN_TEXTURE);
+
+ /*
+ * Save copy of the incoming fragment colors (the GL_PRIMARY_COLOR)
+ */
+ if (swrast->_AnyTextureCombine)
+ MEMCPY(primary_rgba, span->array->rgba, 4 * span->end * sizeof(GLchan));
+
+ /*
+ * Must do all texture sampling before combining in order to
+ * accomodate GL_ARB_texture_env_crossbar.
+ */
+ for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
+ if (ctx->Texture.Unit[unit]._ReallyEnabled) {
+ const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
+ const struct gl_texture_object *curObj = texUnit->_Current;
+ GLfloat *lambda = span->array->lambda[unit];
+ GLchan (*texels)[4] = (GLchan (*)[4])
+ (swrast->TexelBuffer + unit * (span->end * 4 * sizeof(GLchan)));
+
+ /* 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,
+ (const GLfloat (*)[4]) span->array->texcoords[unit],
+ lambda, texels );
+
+ /* GL_SGI_texture_color_table */
+ if (texUnit->ColorTableEnabled) {
+ _mesa_lookup_rgba_chan(&texUnit->ColorTable, 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) {
+ const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
+ if (texUnit->_CurrentCombine != &texUnit->_EnvMode ) {
+ texture_combine( ctx, unit, span->end,
+ (CONST GLchan (*)[4]) primary_rgba,
+ swrast->TexelBuffer,
+ span->array->rgba );
+ }
+ else {
+ /* conventional texture blend */
+ const GLchan (*texels)[4] = (const GLchan (*)[4])
+ (swrast->TexelBuffer + unit *
+ (span->end * 4 * sizeof(GLchan)));
+ texture_apply( ctx, texUnit, span->end,
+ (CONST GLchan (*)[4]) primary_rgba, texels,
+ span->array->rgba );
+ }
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 07:57:26 +0000