--- /dev/null
+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5
+ *
+ * Copyright (C) 1999-2005 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) )
+
+
+/**
+ * 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);
+ static const GLchan one[4] = { 1.0, 1.0, 1.0, 1.0 };
+ static const GLchan zero[4] = { 0.0, 0.0, 0.0, 0.0 };
+#else
+ const GLint half = (CHAN_MAX + 1) / 2;
+ static const GLchan one[4] = { CHAN_MAX, CHAN_MAX, CHAN_MAX, CHAN_MAX };
+ static const GLchan zero[4] = { 0, 0, 0, 0 };
+#endif
+ 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;
+ GLint 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]->Format;
+
+ if (format == GL_COLOR_INDEX || format == GL_YCBCR_MESA) {
+ format = GL_RGBA; /* a bit of a hack */
+ }
+ else if (format == GL_DEPTH_COMPONENT) {
+ 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 */
+ GLint 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:
+ Rc = (GLint) (texUnit->EnvColor[0] * CHAN_MAXF);
+ Gc = (GLint) (texUnit->EnvColor[1] * CHAN_MAXF);
+ Bc = (GLint) (texUnit->EnvColor[2] * CHAN_MAXF);
+ Ac = (GLint) (texUnit->EnvColor[3] * CHAN_MAXF);
+ 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++) {
+ GLuint Lt = texel[i][RCOMP];
+ GLuint r = rgba[i][RCOMP] + Lt;
+ GLuint g = rgba[i][GCOMP] + Lt;
+ GLuint 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++) {
+ GLuint Lt = texel[i][RCOMP];
+ GLuint r = rgba[i][RCOMP] + Lt;
+ GLuint g = rgba[i][GCOMP] + Lt;
+ GLuint 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];
+ GLuint r = rgba[i][RCOMP] + It;
+ GLuint g = rgba[i][GCOMP] + It;
+ GLuint b = rgba[i][BCOMP] + It;
+ GLuint 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++) {
+ GLuint r = rgba[i][RCOMP] + texel[i][RCOMP];
+ GLuint g = rgba[i][GCOMP] + texel[i][GCOMP];
+ GLuint 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++) {
+ GLuint r = rgba[i][RCOMP] + texel[i][RCOMP];
+ GLuint g = rgba[i][GCOMP] + texel[i][GCOMP];
+ GLuint 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 fragments) */
+ swrast->TextureSample[unit]( ctx, unit, 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 );
+ }
+ }
+ }
+}
#include "glheader.h"
#include "context.h"
#include "colormac.h"
-#include "macros.h"
#include "imports.h"
-#include "pixel.h"
#include "texformat.h"
-#include "teximage.h"
#include "s_context.h"
-#include "s_texture.h"
+#include "s_texfilter.h"
/**
}
+/**
+ * Do linear interpolation of colors.
+ */
+static INLINE void
+lerp_rgba(GLchan result[4], GLfloat t, const GLchan a[4], const GLchan b[4])
+{
+#if CHAN_TYPE == GL_FLOAT
+ result[0] = LERP(t, a[0], b[0]);
+ result[1] = LERP(t, a[1], b[1]);
+ result[2] = LERP(t, a[2], b[2]);
+ result[3] = LERP(t, a[3], b[3]);
+#elif CHAN_TYPE == GL_UNSIGNED_SHORT
+ result[0] = (GLchan) (LERP(t, a[0], b[0]) + 0.5);
+ result[1] = (GLchan) (LERP(t, a[1], b[1]) + 0.5);
+ result[2] = (GLchan) (LERP(t, a[2], b[2]) + 0.5);
+ result[3] = (GLchan) (LERP(t, a[3], b[3]) + 0.5);
+#else
+ /* fixed point interpolants in [0, ILERP_SCALE] */
+ const GLint it = IROUND_POS(t * ILERP_SCALE);
+ ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
+ result[0] = ILERP(it, a[0], b[0]);
+ result[1] = ILERP(it, a[1], b[1]);
+ result[2] = ILERP(it, a[2], b[2]);
+ result[3] = ILERP(it, a[3], b[3]);
+#endif
+}
+
+
+/**
+ * Do bilinear interpolation of colors.
+ */
+static INLINE void
+lerp_rgba_2d(GLchan result[4], GLfloat a, GLfloat b,
+ const GLchan t00[4], const GLchan t10[4],
+ const GLchan t01[4], const GLchan t11[4])
+{
+#if CHAN_TYPE == GL_FLOAT
+ result[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]);
+ result[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]);
+ result[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]);
+ result[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]);
+#elif CHAN_TYPE == GL_UNSIGNED_SHORT
+ result[0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5);
+ result[1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5);
+ result[2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5);
+ result[3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5);
+#else
+ const GLint ia = IROUND_POS(a * ILERP_SCALE);
+ const GLint ib = IROUND_POS(b * ILERP_SCALE);
+ ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
+ result[0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]);
+ result[1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]);
+ result[2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]);
+ result[3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]);
+#endif
+}
+
/**
* Compute the remainder of a divided by b, but be careful with
*/
#define COMPUTE_LINEAR_TEXEL_LOCATIONS(wrapMode, S, U, SIZE, I0, I1) \
{ \
- if (wrapMode == GL_REPEAT) { \
+ switch (wrapMode) { \
+ case GL_REPEAT: \
U = S * SIZE - 0.5F; \
if (tObj->_IsPowerOfTwo) { \
I0 = IFLOOR(U) & (SIZE - 1); \
I0 = repeat_remainder(IFLOOR(U), SIZE); \
I1 = repeat_remainder(I0 + 1, SIZE); \
} \
- } \
- else if (wrapMode == GL_CLAMP_TO_EDGE) { \
+ break; \
+ case GL_CLAMP_TO_EDGE: \
if (S <= 0.0F) \
U = 0.0F; \
else if (S >= 1.0F) \
I0 = 0; \
if (I1 >= (GLint) SIZE) \
I1 = SIZE - 1; \
- } \
- else if (wrapMode == GL_CLAMP_TO_BORDER) { \
- const GLfloat min = -1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- if (S <= min) \
- U = min * SIZE; \
- else if (S >= max) \
- U = max * SIZE; \
- else \
- U = S * SIZE; \
- U -= 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- } \
- else if (wrapMode == GL_MIRRORED_REPEAT) { \
- const GLint flr = IFLOOR(S); \
- if (flr & 1) \
- U = 1.0F - (S - (GLfloat) flr); /* flr is odd */ \
- else \
- U = S - (GLfloat) flr; /* flr is even */ \
- U = (U * SIZE) - 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- if (I0 < 0) \
- I0 = 0; \
- if (I1 >= (GLint) SIZE) \
- I1 = SIZE - 1; \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_EXT) { \
+ break; \
+ case GL_CLAMP_TO_BORDER: \
+ { \
+ const GLfloat min = -1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ if (S <= min) \
+ U = min * SIZE; \
+ else if (S >= max) \
+ U = max * SIZE; \
+ else \
+ U = S * SIZE; \
+ U -= 0.5F; \
+ I0 = IFLOOR(U); \
+ I1 = I0 + 1; \
+ } \
+ break; \
+ case GL_MIRRORED_REPEAT: \
+ { \
+ const GLint flr = IFLOOR(S); \
+ if (flr & 1) \
+ U = 1.0F - (S - (GLfloat) flr); /* flr is odd */ \
+ else \
+ U = S - (GLfloat) flr; /* flr is even */ \
+ U = (U * SIZE) - 0.5F; \
+ I0 = IFLOOR(U); \
+ I1 = I0 + 1; \
+ if (I0 < 0) \
+ I0 = 0; \
+ if (I1 >= (GLint) SIZE) \
+ I1 = SIZE - 1; \
+ } \
+ break; \
+ case GL_MIRROR_CLAMP_EXT: \
U = (GLfloat) fabs(S); \
if (U >= 1.0F) \
U = (GLfloat) SIZE; \
U -= 0.5F; \
I0 = IFLOOR(U); \
I1 = I0 + 1; \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_TO_EDGE_EXT) { \
+ break; \
+ case GL_MIRROR_CLAMP_TO_EDGE_EXT: \
U = (GLfloat) fabs(S); \
if (U >= 1.0F) \
U = (GLfloat) SIZE; \
I0 = 0; \
if (I1 >= (GLint) SIZE) \
I1 = SIZE - 1; \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_TO_BORDER_EXT) { \
- const GLfloat min = -1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- U = (GLfloat) fabs(S); \
- if (U <= min) \
- U = min * SIZE; \
- else if (U >= max) \
- U = max * SIZE; \
- else \
- U *= SIZE; \
- U -= 0.5F; \
- I0 = IFLOOR(U); \
- I1 = I0 + 1; \
- } \
- else { \
- ASSERT(wrapMode == GL_CLAMP); \
+ break; \
+ case GL_MIRROR_CLAMP_TO_BORDER_EXT: \
+ { \
+ const GLfloat min = -1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ U = (GLfloat) fabs(S); \
+ if (U <= min) \
+ U = min * SIZE; \
+ else if (U >= max) \
+ U = max * SIZE; \
+ else \
+ U *= SIZE; \
+ U -= 0.5F; \
+ I0 = IFLOOR(U); \
+ I1 = I0 + 1; \
+ } \
+ break; \
+ case GL_CLAMP: \
if (S <= 0.0F) \
U = 0.0F; \
else if (S >= 1.0F) \
U -= 0.5F; \
I0 = IFLOOR(U); \
I1 = I0 + 1; \
+ break; \
+ default: \
+ _mesa_problem(ctx, "Bad wrap mode"); \
} \
}
*/
#define COMPUTE_NEAREST_TEXEL_LOCATION(wrapMode, S, SIZE, I) \
{ \
- if (wrapMode == GL_REPEAT) { \
+ switch (wrapMode) { \
+ case GL_REPEAT: \
/* s limited to [0,1) */ \
/* i limited to [0,size-1] */ \
I = IFLOOR(S * SIZE); \
I &= (SIZE - 1); \
else \
I = repeat_remainder(I, SIZE); \
- } \
- else if (wrapMode == GL_CLAMP_TO_EDGE) { \
- /* s limited to [min,max] */ \
- /* i limited to [0, size-1] */ \
- const GLfloat min = 1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- if (S < min) \
- I = 0; \
- else if (S > max) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(S * SIZE); \
- } \
- else if (wrapMode == GL_CLAMP_TO_BORDER) { \
- /* s limited to [min,max] */ \
- /* i limited to [-1, size] */ \
- const GLfloat min = -1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- if (S <= min) \
- I = -1; \
- else if (S >= max) \
- I = SIZE; \
- else \
- I = IFLOOR(S * SIZE); \
- } \
- else if (wrapMode == GL_MIRRORED_REPEAT) { \
- const GLfloat min = 1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- const GLint flr = IFLOOR(S); \
- GLfloat u; \
- if (flr & 1) \
- u = 1.0F - (S - (GLfloat) flr); /* flr is odd */ \
- else \
- u = S - (GLfloat) flr; /* flr is even */ \
- if (u < min) \
- I = 0; \
- else if (u > max) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_EXT) { \
- /* s limited to [0,1] */ \
- /* i limited to [0,size-1] */ \
- const GLfloat u = (GLfloat) fabs(S); \
- if (u <= 0.0F) \
- I = 0; \
- else if (u >= 1.0F) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_TO_EDGE_EXT) { \
- /* s limited to [min,max] */ \
- /* i limited to [0, size-1] */ \
- const GLfloat min = 1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- const GLfloat u = (GLfloat) fabs(S); \
- if (u < min) \
- I = 0; \
- else if (u > max) \
- I = SIZE - 1; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- else if (wrapMode == GL_MIRROR_CLAMP_TO_BORDER_EXT) { \
- /* s limited to [min,max] */ \
- /* i limited to [0, size-1] */ \
- const GLfloat min = -1.0F / (2.0F * SIZE); \
- const GLfloat max = 1.0F - min; \
- const GLfloat u = (GLfloat) fabs(S); \
- if (u < min) \
- I = -1; \
- else if (u > max) \
- I = SIZE; \
- else \
- I = IFLOOR(u * SIZE); \
- } \
- else { \
- ASSERT(wrapMode == GL_CLAMP); \
+ break; \
+ case GL_CLAMP_TO_EDGE: \
+ { \
+ /* s limited to [min,max] */ \
+ /* i limited to [0, size-1] */ \
+ const GLfloat min = 1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ if (S < min) \
+ I = 0; \
+ else if (S > max) \
+ I = SIZE - 1; \
+ else \
+ I = IFLOOR(S * SIZE); \
+ } \
+ break; \
+ case GL_CLAMP_TO_BORDER: \
+ { \
+ /* s limited to [min,max] */ \
+ /* i limited to [-1, size] */ \
+ const GLfloat min = -1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ if (S <= min) \
+ I = -1; \
+ else if (S >= max) \
+ I = SIZE; \
+ else \
+ I = IFLOOR(S * SIZE); \
+ } \
+ break; \
+ case GL_MIRRORED_REPEAT: \
+ { \
+ const GLfloat min = 1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ const GLint flr = IFLOOR(S); \
+ GLfloat u; \
+ if (flr & 1) \
+ u = 1.0F - (S - (GLfloat) flr); /* flr is odd */ \
+ else \
+ u = S - (GLfloat) flr; /* flr is even */ \
+ if (u < min) \
+ I = 0; \
+ else if (u > max) \
+ I = SIZE - 1; \
+ else \
+ I = IFLOOR(u * SIZE); \
+ } \
+ break; \
+ case GL_MIRROR_CLAMP_EXT: \
+ { \
+ /* s limited to [0,1] */ \
+ /* i limited to [0,size-1] */ \
+ const GLfloat u = (GLfloat) fabs(S); \
+ if (u <= 0.0F) \
+ I = 0; \
+ else if (u >= 1.0F) \
+ I = SIZE - 1; \
+ else \
+ I = IFLOOR(u * SIZE); \
+ } \
+ break; \
+ case GL_MIRROR_CLAMP_TO_EDGE_EXT: \
+ { \
+ /* s limited to [min,max] */ \
+ /* i limited to [0, size-1] */ \
+ const GLfloat min = 1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ const GLfloat u = (GLfloat) fabs(S); \
+ if (u < min) \
+ I = 0; \
+ else if (u > max) \
+ I = SIZE - 1; \
+ else \
+ I = IFLOOR(u * SIZE); \
+ } \
+ break; \
+ case GL_MIRROR_CLAMP_TO_BORDER_EXT: \
+ { \
+ /* s limited to [min,max] */ \
+ /* i limited to [0, size-1] */ \
+ const GLfloat min = -1.0F / (2.0F * SIZE); \
+ const GLfloat max = 1.0F - min; \
+ const GLfloat u = (GLfloat) fabs(S); \
+ if (u < min) \
+ I = -1; \
+ else if (u > max) \
+ I = SIZE; \
+ else \
+ I = IFLOOR(u * SIZE); \
+ } \
+ break; \
+ case GL_CLAMP: \
/* s limited to [0,1] */ \
/* i limited to [0,size-1] */ \
if (S <= 0.0F) \
I = SIZE - 1; \
else \
I = IFLOOR(S * SIZE); \
+ break; \
+ default: \
+ _mesa_problem(ctx, "Bad wrap mode"); \
} \
}
/*
* Note, the FRAC macro has to work perfectly. Otherwise you'll sometimes
- * see 1-pixel bands of improperly weighted linear-sampled texels. The
- * tests/texwrap.c demo is a good test.
+ * see 1-pixel bands of improperly weighted linear-filtered textures.
+ * The tests/texwrap.c demo is a good test.
* Also note, FRAC(x) doesn't truly return the fractional part of x for x < 0.
* Instead, if x < 0 then FRAC(x) = 1 - true_frac(x).
*/
img->FetchTexelc(img, i1, 0, 0, t1);
}
- /* do linear interpolation of texel colors */
-#if CHAN_TYPE == GL_FLOAT
- rgba[0] = LERP(a, t0[0], t1[0]);
- rgba[1] = LERP(a, t0[1], t1[1]);
- rgba[2] = LERP(a, t0[2], t1[2]);
- rgba[3] = LERP(a, t0[3], t1[3]);
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- rgba[0] = (GLchan) (LERP(a, t0[0], t1[0]) + 0.5);
- rgba[1] = (GLchan) (LERP(a, t0[1], t1[1]) + 0.5);
- rgba[2] = (GLchan) (LERP(a, t0[2], t1[2]) + 0.5);
- rgba[3] = (GLchan) (LERP(a, t0[3], t1[3]) + 0.5);
-#else
- ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
- {
- /* fixed point interpolants in [0, ILERP_SCALE] */
- const GLint ia = IROUND_POS(a * ILERP_SCALE);
- rgba[0] = ILERP(ia, t0[0], t1[0]);
- rgba[1] = ILERP(ia, t0[1], t1[1]);
- rgba[2] = ILERP(ia, t0[2], t1[2]);
- rgba[3] = ILERP(ia, t0[3], t1[3]);
- }
-#endif
+ lerp_rgba(rgba, a, t0, t1);
}
}
}
-
-/*
- * This is really just needed in order to prevent warnings with some compilers.
- */
-#if CHAN_TYPE == GL_FLOAT
-#define CHAN_CAST
-#else
-#define CHAN_CAST (GLchan) (GLint)
-#endif
-
-
static void
sample_1d_nearest_mipmap_linear(GLcontext *ctx,
const struct gl_texture_object *tObj,
const GLfloat f = FRAC(lambda[i]);
sample_1d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_1d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ lerp_rgba(rgba[i], f, t0, t1);
}
}
}
const GLfloat f = FRAC(lambda[i]);
sample_1d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_1d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ lerp_rgba(rgba[i], f, t0, t1);
}
}
}
{
const GLfloat a = FRAC(u);
const GLfloat b = FRAC(v);
-#if CHAN_TYPE == GL_UNSIGNED_BYTE
- const GLint ia = IROUND_POS(a * ILERP_SCALE);
- const GLint ib = IROUND_POS(b * ILERP_SCALE);
-#endif
GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
/* fetch four texel colors */
img->FetchTexelc(img, i1, j1, 0, t11);
}
- /* do bilinear interpolation of texel colors */
-#if CHAN_TYPE == GL_FLOAT
- rgba[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]);
- rgba[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]);
- rgba[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]);
- rgba[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]);
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- rgba[0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5);
- rgba[1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5);
- rgba[2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5);
- rgba[3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5);
-#else
- ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
- rgba[0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]);
- rgba[1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]);
- rgba[2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]);
- rgba[3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]);
-#endif
+ lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11);
}
}
/*
* As above, but we know WRAP_S == REPEAT and WRAP_T == REPEAT.
+ * We don't have to worry about the texture border.
*/
static INLINE void
sample_2d_linear_repeat(GLcontext *ctx,
{
const GLfloat a = FRAC(u);
const GLfloat b = FRAC(v);
-#if CHAN_TYPE == GL_UNSIGNED_BYTE
- const GLint ia = IROUND_POS(a * ILERP_SCALE);
- const GLint ib = IROUND_POS(b * ILERP_SCALE);
-#endif
GLchan t00[4], t10[4], t01[4], t11[4]; /* sampled texel colors */
img->FetchTexelc(img, i0, j0, 0, t00);
img->FetchTexelc(img, i0, j1, 0, t01);
img->FetchTexelc(img, i1, j1, 0, t11);
- /* do bilinear interpolation of texel colors */
-#if CHAN_TYPE == GL_FLOAT
- rgba[0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]);
- rgba[1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]);
- rgba[2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]);
- rgba[3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]);
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- rgba[0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5);
- rgba[1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5);
- rgba[2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5);
- rgba[3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5);
-#else
- ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
- rgba[0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]);
- rgba[1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]);
- rgba[2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]);
- rgba[3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]);
-#endif
+ lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11);
}
}
const GLfloat f = FRAC(lambda[i]);
sample_2d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_2d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ lerp_rgba(rgba[i], f, t0, t1);
}
}
}
const GLfloat f = FRAC(lambda[i]);
sample_2d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_2d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ lerp_rgba(rgba[i], f, t0, t1);
}
}
}
const GLfloat f = FRAC(lambda[i]);
sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_2d_linear_repeat(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ lerp_rgba(rgba[i], f, t0, t1);
}
}
}
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
(void) texUnit;
(void) lambda;
- if (tObj->WrapS == GL_REPEAT && tObj->WrapT == GL_REPEAT
- && image->Border == 0) {
+ if (tObj->WrapS == GL_REPEAT && tObj->WrapT == GL_REPEAT) {
for (i=0;i<n;i++) {
sample_2d_linear_repeat(ctx, tObj, image, texcoords[i], rgba[i]);
}
const GLfloat f = FRAC(lambda[i]);
sample_3d_nearest(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_3d_nearest(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ lerp_rgba(rgba[i], f, t0, t1);
}
}
}
const GLfloat f = FRAC(lambda[i]);
sample_3d_linear(ctx, tObj, tObj->Image[0][level ], texcoord[i], t0);
sample_3d_linear(ctx, tObj, tObj->Image[0][level+1], texcoord[i], t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ lerp_rgba(rgba[i], f, t0, t1);
}
}
}
/* Texture Cube Map Sampling Functions */
/**********************************************************************/
-/*
+/**
* Choose one of six sides of a texture cube map given the texture
* coord (rx,ry,rz). Return pointer to corresponding array of texture
* images.
choose_cube_face(const struct gl_texture_object *texObj,
const GLfloat texcoord[4], GLfloat newCoord[4])
{
-/*
+ /*
major axis
direction target sc tc ma
---------- ------------------------------- --- --- ---
-ry TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT +rx -rz ry
+rz TEXTURE_CUBE_MAP_POSITIVE_Z_EXT +rx -ry rz
-rz TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT -rx -ry rz
-*/
+ */
const GLfloat rx = texcoord[0];
const GLfloat ry = texcoord[1];
const GLfloat rz = texcoord[2];
- const struct gl_texture_image **imgArray;
- const GLfloat arx = FABSF(rx), ary = FABSF(ry), arz = FABSF(rz);
+ const GLfloat arx = FABSF(rx), ary = FABSF(ry), arz = FABSF(rz);
+ GLuint face;
GLfloat sc, tc, ma;
if (arx > ary && arx > arz) {
if (rx >= 0.0F) {
- imgArray = (const struct gl_texture_image **) texObj->Image[FACE_POS_X];
+ face = FACE_POS_X;
sc = -rz;
tc = -ry;
ma = arx;
}
else {
- imgArray = (const struct gl_texture_image **) texObj->Image[FACE_NEG_X];
+ face = FACE_NEG_X;
sc = rz;
tc = -ry;
ma = arx;
}
else if (ary > arx && ary > arz) {
if (ry >= 0.0F) {
- imgArray = (const struct gl_texture_image **) texObj->Image[FACE_POS_Y];
+ face = FACE_POS_Y;
sc = rx;
tc = rz;
ma = ary;
}
else {
- imgArray = (const struct gl_texture_image **) texObj->Image[FACE_NEG_Y];
+ face = FACE_NEG_Y;
sc = rx;
tc = -rz;
ma = ary;
}
else {
if (rz > 0.0F) {
- imgArray = (const struct gl_texture_image **) texObj->Image[FACE_POS_Z];
+ face = FACE_POS_Z;
sc = rx;
tc = -ry;
ma = arz;
}
else {
- imgArray = (const struct gl_texture_image **) texObj->Image[FACE_NEG_Z];
+ face = FACE_NEG_Z;
sc = -rx;
tc = -ry;
ma = arz;
newCoord[0] = ( sc / ma + 1.0F ) * 0.5F;
newCoord[1] = ( tc / ma + 1.0F ) * 0.5F;
- return imgArray;
+ return (const struct gl_texture_image **) texObj->Image[face];
}
const GLfloat f = FRAC(lambda[i]);
sample_2d_nearest(ctx, tObj, images[level ], newCoord, t0);
sample_2d_nearest(ctx, tObj, images[level+1], newCoord, t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ lerp_rgba(rgba[i], f, t0, t1);
}
}
}
const GLfloat f = FRAC(lambda[i]);
sample_2d_linear(ctx, tObj, images[level ], newCoord, t0);
sample_2d_linear(ctx, tObj, images[level+1], newCoord, t1);
- rgba[i][RCOMP] = CHAN_CAST ((1.0F-f) * t0[RCOMP] + f * t1[RCOMP]);
- rgba[i][GCOMP] = CHAN_CAST ((1.0F-f) * t0[GCOMP] + f * t1[GCOMP]);
- rgba[i][BCOMP] = CHAN_CAST ((1.0F-f) * t0[BCOMP] + f * t1[BCOMP]);
- rgba[i][ACOMP] = CHAN_CAST ((1.0F-f) * t0[ACOMP] + f * t1[ACOMP]);
+ lerp_rgba(rgba[i], f, t0, t1);
}
}
}
GLchan t00[4], t01[4], t10[4], t11[4];
GLfloat a, b;
GLuint useBorderColor = 0;
-#if CHAN_TYPE == GL_UNSIGNED_BYTE
- GLint ia, ib;
-#endif
/* NOTE: we DO NOT use [0, 1] texture coordinates! */
if (tObj->WrapS == GL_CLAMP) {
/* compute interpolants */
a = FRAC(fcol);
b = FRAC(frow);
-#if CHAN_TYPE == GL_UNSIGNED_BYTE
- ia = IROUND_POS(a * ILERP_SCALE);
- ib = IROUND_POS(b * ILERP_SCALE);
-#endif
- /* do bilinear interpolation of texel colors */
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][0] = lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]);
- rgba[i][1] = lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]);
- rgba[i][2] = lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]);
- rgba[i][3] = lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]);
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- rgba[i][0] = (GLchan) (lerp_2d(a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5);
- rgba[i][1] = (GLchan) (lerp_2d(a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5);
- rgba[i][2] = (GLchan) (lerp_2d(a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5);
- rgba[i][3] = (GLchan) (lerp_2d(a, b, t00[3], t10[3], t01[3], t11[3]) + 0.5);
-#else
- ASSERT(CHAN_TYPE == GL_UNSIGNED_BYTE);
- rgba[i][0] = ilerp_2d(ia, ib, t00[0], t10[0], t01[0], t11[0]);
- rgba[i][1] = ilerp_2d(ia, ib, t00[1], t10[1], t01[1], t11[1]);
- rgba[i][2] = ilerp_2d(ia, ib, t00[2], t10[2], t01[2], t11[2]);
- rgba[i][3] = ilerp_2d(ia, ib, t00[3], t10[3], t01[3], t11[3]);
-#endif
+ lerp_rgba_2d(rgba[i], a, b, t00, t10, t01, t11);
}
}
/**
- * Setup the texture sampling function for this texture object.
+ * Choose the texture sampling function for the given texture object.
*/
texture_sample_func
_swrast_choose_texture_sample_func( GLcontext *ctx,
}
}
}
-
-
-/* Fixed-point products */
-#define PROD(A,B) ( (GLuint)(A) * ((GLuint)(B)+1) )
-#define S_PROD(A,B) ( (GLint)(A) * ((GLint)(B)+1) )
-
-
-/**
- * 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);
- static const GLchan one[4] = { 1.0, 1.0, 1.0, 1.0 };
- static const GLchan zero[4] = { 0.0, 0.0, 0.0, 0.0 };
-#else
- const GLint half = (CHAN_MAX + 1) / 2;
- static const GLchan one[4] = { CHAN_MAX, CHAN_MAX, CHAN_MAX, CHAN_MAX };
- static const GLchan zero[4] = { 0, 0, 0, 0 };
-#endif
- 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;
- GLint 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]->Format;
-
- if (format == GL_COLOR_INDEX || format == GL_YCBCR_MESA) {
- format = GL_RGBA; /* a bit of a hack */
- }
- else if (format == GL_DEPTH_COMPONENT) {
- 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 */
- GLint 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:
- Rc = (GLint) (texUnit->EnvColor[0] * CHAN_MAXF);
- Gc = (GLint) (texUnit->EnvColor[1] * CHAN_MAXF);
- Bc = (GLint) (texUnit->EnvColor[2] * CHAN_MAXF);
- Ac = (GLint) (texUnit->EnvColor[3] * CHAN_MAXF);
- 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++) {
- GLuint Lt = texel[i][RCOMP];
- GLuint r = rgba[i][RCOMP] + Lt;
- GLuint g = rgba[i][GCOMP] + Lt;
- GLuint 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++) {
- GLuint Lt = texel[i][RCOMP];
- GLuint r = rgba[i][RCOMP] + Lt;
- GLuint g = rgba[i][GCOMP] + Lt;
- GLuint 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];
- GLuint r = rgba[i][RCOMP] + It;
- GLuint g = rgba[i][GCOMP] + It;
- GLuint b = rgba[i][BCOMP] + It;
- GLuint 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++) {
- GLuint r = rgba[i][RCOMP] + texel[i][RCOMP];
- GLuint g = rgba[i][GCOMP] + texel[i][GCOMP];
- GLuint 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++) {
- GLuint r = rgba[i][RCOMP] + texel[i][RCOMP];
- GLuint g = rgba[i][GCOMP] + texel[i][GCOMP];
- GLuint 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 fragments) */
- swrast->TextureSample[unit]( ctx, unit, 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 );
- }
- }
- }
-}
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