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Diffstat (limited to 'src/mesa/swrast/s_texcombine.c')
| -rw-r--r-- | src/mesa/swrast/s_texcombine.c | 1162 |
1 files changed, 1162 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_texcombine.c b/src/mesa/swrast/s_texcombine.c new file mode 100644 index 00000000000..65eccad2e91 --- /dev/null +++ b/src/mesa/swrast/s_texcombine.c @@ -0,0 +1,1162 @@ +/* + * 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 ); + } + } + } +} |