| /* |
| * Mesa 3-D graphics library |
| * Version: 6.5.1 |
| * |
| * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
| * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| |
| #include "glheader.h" |
| #include "context.h" |
| #include "colormac.h" |
| #include "imports.h" |
| #include "macros.h" |
| #include "pixel.h" |
| |
| #include "s_context.h" |
| #include "s_texcombine.h" |
| |
| |
| #define PROD(A,B) ( (GLuint)(A) * ((GLuint)(B)+1) ) |
| #define S_PROD(A,B) ( (GLint)(A) * ((GLint)(B)+1) ) |
| #if CHAN_BITS == 32 |
| typedef GLfloat ChanTemp; |
| #else |
| typedef GLuint ChanTemp; |
| #endif |
| |
| |
| /** |
| * Do texture application for GL_ARB/EXT_texture_env_combine. |
| * This function also supports GL_{EXT,ARB}_texture_env_dot3 and |
| * GL_ATI_texture_env_combine3. Since "classic" texture environments are |
| * implemented using GL_ARB_texture_env_combine-like state, this same function |
| * is used for classic texture environment application as well. |
| * |
| * \param ctx rendering context |
| * \param textureUnit the texture unit to apply |
| * \param n number of fragments to process (span width) |
| * \param primary_rgba incoming fragment color array |
| * \param texelBuffer pointer to texel colors for all texture units |
| * |
| * \param rgba incoming colors, which get modified here |
| */ |
| static void |
| texture_combine( const GLcontext *ctx, GLuint unit, GLuint n, |
| CONST GLchan (*primary_rgba)[4], |
| CONST GLchan *texelBuffer, |
| GLchan (*rgba)[4] ) |
| { |
| const struct gl_texture_unit *textureUnit = &(ctx->Texture.Unit[unit]); |
| const GLchan (*argRGB [3])[4]; |
| const GLchan (*argA [3])[4]; |
| const GLuint RGBshift = textureUnit->_CurrentCombine->ScaleShiftRGB; |
| const GLuint Ashift = textureUnit->_CurrentCombine->ScaleShiftA; |
| #if CHAN_TYPE == GL_FLOAT |
| const GLchan RGBmult = (GLfloat) (1 << RGBshift); |
| const GLchan Amult = (GLfloat) (1 << Ashift); |
| #else |
| const GLint half = (CHAN_MAX + 1) / 2; |
| #endif |
| static const GLchan one[4] = { CHAN_MAX, CHAN_MAX, CHAN_MAX, CHAN_MAX }; |
| static const GLchan zero[4] = { 0, 0, 0, 0 }; |
| const GLuint numColorArgs = textureUnit->_CurrentCombine->_NumArgsRGB; |
| const GLuint numAlphaArgs = textureUnit->_CurrentCombine->_NumArgsA; |
| GLchan ccolor[3][MAX_WIDTH][4]; |
| GLuint i, j; |
| |
| ASSERT(ctx->Extensions.EXT_texture_env_combine || |
| ctx->Extensions.ARB_texture_env_combine); |
| ASSERT(SWRAST_CONTEXT(ctx)->_AnyTextureCombine); |
| |
| /* |
| printf("modeRGB 0x%x modeA 0x%x srcRGB1 0x%x srcA1 0x%x srcRGB2 0x%x srcA2 0x%x\n", |
| textureUnit->_CurrentCombine->ModeRGB, |
| textureUnit->_CurrentCombine->ModeA, |
| textureUnit->_CurrentCombine->SourceRGB[0], |
| textureUnit->_CurrentCombine->SourceA[0], |
| textureUnit->_CurrentCombine->SourceRGB[1], |
| textureUnit->_CurrentCombine->SourceA[1]); |
| */ |
| |
| /* |
| * Do operand setup for up to 3 operands. Loop over the terms. |
| */ |
| for (j = 0; j < numColorArgs; j++) { |
| const GLenum srcRGB = textureUnit->_CurrentCombine->SourceRGB[j]; |
| |
| switch (srcRGB) { |
| case GL_TEXTURE: |
| argRGB[j] = (const GLchan (*)[4]) |
| (texelBuffer + unit * (n * 4 * sizeof(GLchan))); |
| break; |
| case GL_PRIMARY_COLOR: |
| argRGB[j] = primary_rgba; |
| break; |
| case GL_PREVIOUS: |
| argRGB[j] = (const GLchan (*)[4]) rgba; |
| break; |
| case GL_CONSTANT: |
| { |
| GLchan (*c)[4] = ccolor[j]; |
| GLchan red, green, blue, alpha; |
| UNCLAMPED_FLOAT_TO_CHAN(red, textureUnit->EnvColor[0]); |
| UNCLAMPED_FLOAT_TO_CHAN(green, textureUnit->EnvColor[1]); |
| UNCLAMPED_FLOAT_TO_CHAN(blue, textureUnit->EnvColor[2]); |
| UNCLAMPED_FLOAT_TO_CHAN(alpha, textureUnit->EnvColor[3]); |
| for (i = 0; i < n; i++) { |
| c[i][RCOMP] = red; |
| c[i][GCOMP] = green; |
| c[i][BCOMP] = blue; |
| c[i][ACOMP] = alpha; |
| } |
| argRGB[j] = (const GLchan (*)[4]) ccolor[j]; |
| } |
| break; |
| /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources. |
| */ |
| case GL_ZERO: |
| argRGB[j] = & zero; |
| break; |
| case GL_ONE: |
| argRGB[j] = & one; |
| break; |
| default: |
| /* ARB_texture_env_crossbar source */ |
| { |
| const GLuint srcUnit = srcRGB - GL_TEXTURE0; |
| ASSERT(srcUnit < ctx->Const.MaxTextureUnits); |
| if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled) |
| return; |
| argRGB[j] = (const GLchan (*)[4]) |
| (texelBuffer + srcUnit * (n * 4 * sizeof(GLchan))); |
| } |
| } |
| |
| if (textureUnit->_CurrentCombine->OperandRGB[j] != GL_SRC_COLOR) { |
| const GLchan (*src)[4] = argRGB[j]; |
| GLchan (*dst)[4] = ccolor[j]; |
| |
| /* point to new arg[j] storage */ |
| argRGB[j] = (const GLchan (*)[4]) ccolor[j]; |
| |
| if (textureUnit->_CurrentCombine->OperandRGB[j] == GL_ONE_MINUS_SRC_COLOR) { |
| for (i = 0; i < n; i++) { |
| dst[i][RCOMP] = CHAN_MAX - src[i][RCOMP]; |
| dst[i][GCOMP] = CHAN_MAX - src[i][GCOMP]; |
| dst[i][BCOMP] = CHAN_MAX - src[i][BCOMP]; |
| } |
| } |
| else if (textureUnit->_CurrentCombine->OperandRGB[j] == GL_SRC_ALPHA) { |
| for (i = 0; i < n; i++) { |
| dst[i][RCOMP] = src[i][ACOMP]; |
| dst[i][GCOMP] = src[i][ACOMP]; |
| dst[i][BCOMP] = src[i][ACOMP]; |
| } |
| } |
| else { |
| ASSERT(textureUnit->_CurrentCombine->OperandRGB[j] ==GL_ONE_MINUS_SRC_ALPHA); |
| for (i = 0; i < n; i++) { |
| dst[i][RCOMP] = CHAN_MAX - src[i][ACOMP]; |
| dst[i][GCOMP] = CHAN_MAX - src[i][ACOMP]; |
| dst[i][BCOMP] = CHAN_MAX - src[i][ACOMP]; |
| } |
| } |
| } |
| } |
| |
| /* |
| * Set up the argA[i] pointers |
| */ |
| for (j = 0; j < numAlphaArgs; j++) { |
| const GLenum srcA = textureUnit->_CurrentCombine->SourceA[j]; |
| |
| switch (srcA) { |
| case GL_TEXTURE: |
| argA[j] = (const GLchan (*)[4]) |
| (texelBuffer + unit * (n * 4 * sizeof(GLchan))); |
| break; |
| case GL_PRIMARY_COLOR: |
| argA[j] = primary_rgba; |
| break; |
| case GL_PREVIOUS: |
| argA[j] = (const GLchan (*)[4]) rgba; |
| break; |
| case GL_CONSTANT: |
| { |
| GLchan alpha, (*c)[4] = ccolor[j]; |
| UNCLAMPED_FLOAT_TO_CHAN(alpha, textureUnit->EnvColor[3]); |
| for (i = 0; i < n; i++) |
| c[i][ACOMP] = alpha; |
| argA[j] = (const GLchan (*)[4]) ccolor[j]; |
| } |
| break; |
| /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources. |
| */ |
| case GL_ZERO: |
| argA[j] = & zero; |
| break; |
| case GL_ONE: |
| argA[j] = & one; |
| break; |
| default: |
| /* ARB_texture_env_crossbar source */ |
| { |
| const GLuint srcUnit = srcA - GL_TEXTURE0; |
| ASSERT(srcUnit < ctx->Const.MaxTextureUnits); |
| if (!ctx->Texture.Unit[srcUnit]._ReallyEnabled) |
| return; |
| argA[j] = (const GLchan (*)[4]) |
| (texelBuffer + srcUnit * (n * 4 * sizeof(GLchan))); |
| } |
| } |
| |
| if (textureUnit->_CurrentCombine->OperandA[j] == GL_ONE_MINUS_SRC_ALPHA) { |
| const GLchan (*src)[4] = argA[j]; |
| GLchan (*dst)[4] = ccolor[j]; |
| argA[j] = (const GLchan (*)[4]) ccolor[j]; |
| for (i = 0; i < n; i++) { |
| dst[i][ACOMP] = CHAN_MAX - src[i][ACOMP]; |
| } |
| } |
| } |
| |
| /* |
| * Do the texture combine. |
| */ |
| switch (textureUnit->_CurrentCombine->ModeRGB) { |
| case GL_REPLACE: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| if (RGBshift) { |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][RCOMP] = arg0[i][RCOMP] * RGBmult; |
| rgba[i][GCOMP] = arg0[i][GCOMP] * RGBmult; |
| rgba[i][BCOMP] = arg0[i][BCOMP] * RGBmult; |
| #else |
| GLuint r = (GLuint) arg0[i][RCOMP] << RGBshift; |
| GLuint g = (GLuint) arg0[i][GCOMP] << RGBshift; |
| GLuint b = (GLuint) arg0[i][BCOMP] << RGBshift; |
| rgba[i][RCOMP] = MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = MIN2(b, CHAN_MAX); |
| #endif |
| } |
| } |
| else { |
| for (i = 0; i < n; i++) { |
| rgba[i][RCOMP] = arg0[i][RCOMP]; |
| rgba[i][GCOMP] = arg0[i][GCOMP]; |
| rgba[i][BCOMP] = arg0[i][BCOMP]; |
| } |
| } |
| } |
| break; |
| case GL_MODULATE: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - RGBshift; |
| #endif |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][RCOMP] = arg0[i][RCOMP] * arg1[i][RCOMP] * RGBmult; |
| rgba[i][GCOMP] = arg0[i][GCOMP] * arg1[i][GCOMP] * RGBmult; |
| rgba[i][BCOMP] = arg0[i][BCOMP] * arg1[i][BCOMP] * RGBmult; |
| #else |
| GLuint r = PROD(arg0[i][RCOMP], arg1[i][RCOMP]) >> shift; |
| GLuint g = PROD(arg0[i][GCOMP], arg1[i][GCOMP]) >> shift; |
| GLuint b = PROD(arg0[i][BCOMP], arg1[i][BCOMP]) >> shift; |
| rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_ADD: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP]) * RGBmult; |
| rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP]) * RGBmult; |
| rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP]) * RGBmult; |
| #else |
| GLint r = ((GLint) arg0[i][RCOMP] + (GLint) arg1[i][RCOMP]) << RGBshift; |
| GLint g = ((GLint) arg0[i][GCOMP] + (GLint) arg1[i][GCOMP]) << RGBshift; |
| GLint b = ((GLint) arg0[i][BCOMP] + (GLint) arg1[i][BCOMP]) << RGBshift; |
| rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_ADD_SIGNED: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP] - 0.5) * RGBmult; |
| rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] - 0.5) * RGBmult; |
| rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] - 0.5) * RGBmult; |
| #else |
| GLint r = (GLint) arg0[i][RCOMP] + (GLint) arg1[i][RCOMP] -half; |
| GLint g = (GLint) arg0[i][GCOMP] + (GLint) arg1[i][GCOMP] -half; |
| GLint b = (GLint) arg0[i][BCOMP] + (GLint) arg1[i][BCOMP] -half; |
| r = (r < 0) ? 0 : r << RGBshift; |
| g = (g < 0) ? 0 : g << RGBshift; |
| b = (b < 0) ? 0 : b << RGBshift; |
| rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_INTERPOLATE: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - RGBshift; |
| #endif |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][RCOMP] = (arg0[i][RCOMP] * arg2[i][RCOMP] + |
| arg1[i][RCOMP] * (CHAN_MAXF - arg2[i][RCOMP])) * RGBmult; |
| rgba[i][GCOMP] = (arg0[i][GCOMP] * arg2[i][GCOMP] + |
| arg1[i][GCOMP] * (CHAN_MAXF - arg2[i][GCOMP])) * RGBmult; |
| rgba[i][BCOMP] = (arg0[i][BCOMP] * arg2[i][BCOMP] + |
| arg1[i][BCOMP] * (CHAN_MAXF - arg2[i][BCOMP])) * RGBmult; |
| #else |
| GLuint r = (PROD(arg0[i][RCOMP], arg2[i][RCOMP]) |
| + PROD(arg1[i][RCOMP], CHAN_MAX - arg2[i][RCOMP])) |
| >> shift; |
| GLuint g = (PROD(arg0[i][GCOMP], arg2[i][GCOMP]) |
| + PROD(arg1[i][GCOMP], CHAN_MAX - arg2[i][GCOMP])) |
| >> shift; |
| GLuint b = (PROD(arg0[i][BCOMP], arg2[i][BCOMP]) |
| + PROD(arg1[i][BCOMP], CHAN_MAX - arg2[i][BCOMP])) |
| >> shift; |
| rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_SUBTRACT: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][RCOMP] = (arg0[i][RCOMP] - arg1[i][RCOMP]) * RGBmult; |
| rgba[i][GCOMP] = (arg0[i][GCOMP] - arg1[i][GCOMP]) * RGBmult; |
| rgba[i][BCOMP] = (arg0[i][BCOMP] - arg1[i][BCOMP]) * RGBmult; |
| #else |
| GLint r = ((GLint) arg0[i][RCOMP] - (GLint) arg1[i][RCOMP]) << RGBshift; |
| GLint g = ((GLint) arg0[i][GCOMP] - (GLint) arg1[i][GCOMP]) << RGBshift; |
| GLint b = ((GLint) arg0[i][BCOMP] - (GLint) arg1[i][BCOMP]) << RGBshift; |
| rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX); |
| rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX); |
| rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_DOT3_RGB_EXT: |
| case GL_DOT3_RGBA_EXT: |
| { |
| /* Do not scale the result by 1 2 or 4 */ |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| GLchan dot = ((arg0[i][RCOMP]-0.5F) * (arg1[i][RCOMP]-0.5F) + |
| (arg0[i][GCOMP]-0.5F) * (arg1[i][GCOMP]-0.5F) + |
| (arg0[i][BCOMP]-0.5F) * (arg1[i][BCOMP]-0.5F)) |
| * 4.0F; |
| dot = CLAMP(dot, 0.0F, CHAN_MAXF); |
| #else |
| GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - half, |
| (GLint)arg1[i][RCOMP] - half) + |
| S_PROD((GLint)arg0[i][GCOMP] - half, |
| (GLint)arg1[i][GCOMP] - half) + |
| S_PROD((GLint)arg0[i][BCOMP] - half, |
| (GLint)arg1[i][BCOMP] - half)) >> 6; |
| dot = CLAMP(dot, 0, CHAN_MAX); |
| #endif |
| rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot; |
| } |
| } |
| break; |
| case GL_DOT3_RGB: |
| case GL_DOT3_RGBA: |
| { |
| /* DO scale the result by 1 2 or 4 */ |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| GLchan dot = ((arg0[i][RCOMP]-0.5F) * (arg1[i][RCOMP]-0.5F) + |
| (arg0[i][GCOMP]-0.5F) * (arg1[i][GCOMP]-0.5F) + |
| (arg0[i][BCOMP]-0.5F) * (arg1[i][BCOMP]-0.5F)) |
| * 4.0F * RGBmult; |
| dot = CLAMP(dot, 0.0, CHAN_MAXF); |
| #else |
| GLint dot = (S_PROD((GLint)arg0[i][RCOMP] - half, |
| (GLint)arg1[i][RCOMP] - half) + |
| S_PROD((GLint)arg0[i][GCOMP] - half, |
| (GLint)arg1[i][GCOMP] - half) + |
| S_PROD((GLint)arg0[i][BCOMP] - half, |
| (GLint)arg1[i][BCOMP] - half)) >> 6; |
| dot <<= RGBshift; |
| dot = CLAMP(dot, 0, CHAN_MAX); |
| #endif |
| rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = (GLchan) dot; |
| } |
| } |
| break; |
| case GL_MODULATE_ADD_ATI: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - RGBshift; |
| #endif |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) + arg1[i][RCOMP]) * RGBmult; |
| rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) + arg1[i][GCOMP]) * RGBmult; |
| rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) + arg1[i][BCOMP]) * RGBmult; |
| #else |
| GLuint r = (PROD(arg0[i][RCOMP], arg2[i][RCOMP]) |
| + ((GLuint) arg1[i][RCOMP] << CHAN_BITS)) >> shift; |
| GLuint g = (PROD(arg0[i][GCOMP], arg2[i][GCOMP]) |
| + ((GLuint) arg1[i][GCOMP] << CHAN_BITS)) >> shift; |
| GLuint b = (PROD(arg0[i][BCOMP], arg2[i][BCOMP]) |
| + ((GLuint) arg1[i][BCOMP] << CHAN_BITS)) >> shift; |
| rgba[i][RCOMP] = (GLchan) MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = (GLchan) MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = (GLchan) MIN2(b, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_MODULATE_SIGNED_ADD_ATI: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - RGBshift; |
| #endif |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) + arg1[i][RCOMP] - 0.5) * RGBmult; |
| rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) + arg1[i][GCOMP] - 0.5) * RGBmult; |
| rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) + arg1[i][BCOMP] - 0.5) * RGBmult; |
| #else |
| GLint r = (S_PROD(arg0[i][RCOMP], arg2[i][RCOMP]) |
| + (((GLint) arg1[i][RCOMP] - half) << CHAN_BITS)) |
| >> shift; |
| GLint g = (S_PROD(arg0[i][GCOMP], arg2[i][GCOMP]) |
| + (((GLint) arg1[i][GCOMP] - half) << CHAN_BITS)) |
| >> shift; |
| GLint b = (S_PROD(arg0[i][BCOMP], arg2[i][BCOMP]) |
| + (((GLint) arg1[i][BCOMP] - half) << CHAN_BITS)) |
| >> shift; |
| rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX); |
| rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX); |
| rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_MODULATE_SUBTRACT_ATI: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argRGB[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argRGB[1]; |
| const GLchan (*arg2)[4] = (const GLchan (*)[4]) argRGB[2]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - RGBshift; |
| #endif |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) - arg1[i][RCOMP]) * RGBmult; |
| rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) - arg1[i][GCOMP]) * RGBmult; |
| rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) - arg1[i][BCOMP]) * RGBmult; |
| #else |
| GLint r = (S_PROD(arg0[i][RCOMP], arg2[i][RCOMP]) |
| - ((GLint) arg1[i][RCOMP] << CHAN_BITS)) |
| >> shift; |
| GLint g = (S_PROD(arg0[i][GCOMP], arg2[i][GCOMP]) |
| - ((GLint) arg1[i][GCOMP] << CHAN_BITS)) |
| >> shift; |
| GLint b = (S_PROD(arg0[i][BCOMP], arg2[i][BCOMP]) |
| - ((GLint) arg1[i][BCOMP] << CHAN_BITS)) |
| >> shift; |
| rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX); |
| rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX); |
| rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| default: |
| _mesa_problem(ctx, "invalid combine mode"); |
| } |
| |
| switch (textureUnit->_CurrentCombine->ModeA) { |
| case GL_REPLACE: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; |
| if (Ashift) { |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| GLchan a = arg0[i][ACOMP] * Amult; |
| #else |
| GLuint a = (GLuint) arg0[i][ACOMP] << Ashift; |
| #endif |
| rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX); |
| } |
| } |
| else { |
| for (i = 0; i < n; i++) { |
| rgba[i][ACOMP] = arg0[i][ACOMP]; |
| } |
| } |
| } |
| break; |
| case GL_MODULATE: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - Ashift; |
| #endif |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * Amult; |
| #else |
| GLuint a = (PROD(arg0[i][ACOMP], arg1[i][ACOMP]) >> shift); |
| rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_ADD: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP]) * Amult; |
| #else |
| GLint a = ((GLint) arg0[i][ACOMP] + arg1[i][ACOMP]) << Ashift; |
| rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_ADD_SIGNED: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * Amult; |
| #else |
| GLint a = (GLint) arg0[i][ACOMP] + (GLint) arg1[i][ACOMP] -half; |
| a = (a < 0) ? 0 : a << Ashift; |
| rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_INTERPOLATE: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; |
| const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - Ashift; |
| #endif |
| for (i=0; i<n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][ACOMP] = (arg0[i][ACOMP] * arg2[i][ACOMP] + |
| arg1[i][ACOMP] * (CHAN_MAXF - arg2[i][ACOMP])) |
| * Amult; |
| #else |
| GLuint a = (PROD(arg0[i][ACOMP], arg2[i][ACOMP]) |
| + PROD(arg1[i][ACOMP], CHAN_MAX - arg2[i][ACOMP])) |
| >> shift; |
| rgba[i][ACOMP] = (GLchan) MIN2(a, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_SUBTRACT: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][ACOMP] = (arg0[i][ACOMP] - arg1[i][ACOMP]) * Amult; |
| #else |
| GLint a = ((GLint) arg0[i][ACOMP] - (GLint) arg1[i][ACOMP]) << Ashift; |
| rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_MODULATE_ADD_ATI: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; |
| const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - Ashift; |
| #endif |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) + arg1[i][ACOMP]) * Amult; |
| #else |
| GLint a = (PROD(arg0[i][ACOMP], arg2[i][ACOMP]) |
| + ((GLuint) arg1[i][ACOMP] << CHAN_BITS)) |
| >> shift; |
| rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_MODULATE_SIGNED_ADD_ATI: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; |
| const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - Ashift; |
| #endif |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) + arg1[i][ACOMP] - 0.5F) * Amult; |
| #else |
| GLint a = (S_PROD(arg0[i][ACOMP], arg2[i][ACOMP]) |
| + (((GLint) arg1[i][ACOMP] - half) << CHAN_BITS)) |
| >> shift; |
| rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| case GL_MODULATE_SUBTRACT_ATI: |
| { |
| const GLchan (*arg0)[4] = (const GLchan (*)[4]) argA[0]; |
| const GLchan (*arg1)[4] = (const GLchan (*)[4]) argA[1]; |
| const GLchan (*arg2)[4] = (const GLchan (*)[4]) argA[2]; |
| #if CHAN_TYPE != GL_FLOAT |
| const GLint shift = CHAN_BITS - Ashift; |
| #endif |
| for (i = 0; i < n; i++) { |
| #if CHAN_TYPE == GL_FLOAT |
| rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) - arg1[i][ACOMP]) * Amult; |
| #else |
| GLint a = (S_PROD(arg0[i][ACOMP], arg2[i][ACOMP]) |
| - ((GLint) arg1[i][ACOMP] << CHAN_BITS)) |
| >> shift; |
| rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX); |
| #endif |
| } |
| } |
| break; |
| default: |
| _mesa_problem(ctx, "invalid combine mode"); |
| } |
| |
| /* Fix the alpha component for GL_DOT3_RGBA_EXT/ARB combining. |
| * This is kind of a kludge. It would have been better if the spec |
| * were written such that the GL_COMBINE_ALPHA value could be set to |
| * GL_DOT3. |
| */ |
| if (textureUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA_EXT || |
| textureUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA) { |
| for (i = 0; i < n; i++) { |
| rgba[i][ACOMP] = rgba[i][RCOMP]; |
| } |
| } |
| } |
| #undef PROD |
| |
| |
| /** |
| * Apply a conventional OpenGL texture env mode (REPLACE, ADD, BLEND, |
| * MODULATE, or DECAL) to an array of fragments. |
| * Input: textureUnit - pointer to texture unit to apply |
| * format - base internal texture format |
| * n - number of fragments |
| * primary_rgba - primary colors (may alias rgba for single texture) |
| * texels - array of texel colors |
| * InOut: rgba - incoming fragment colors modified by texel colors |
| * according to the texture environment mode. |
| */ |
| static void |
| texture_apply( const GLcontext *ctx, |
| const struct gl_texture_unit *texUnit, |
| GLuint n, |
| CONST GLchan primary_rgba[][4], CONST GLchan texel[][4], |
| GLchan rgba[][4] ) |
| { |
| GLint baseLevel; |
| GLuint i; |
| GLchan Rc, Gc, Bc, Ac; |
| GLenum format; |
| (void) primary_rgba; |
| |
| ASSERT(texUnit); |
| ASSERT(texUnit->_Current); |
| |
| baseLevel = texUnit->_Current->BaseLevel; |
| ASSERT(texUnit->_Current->Image[0][baseLevel]); |
| |
| format = texUnit->_Current->Image[0][baseLevel]->_BaseFormat; |
| |
| if (format == GL_COLOR_INDEX || format == GL_YCBCR_MESA) { |
| format = GL_RGBA; /* a bit of a hack */ |
| } |
| else if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL_EXT) { |
| format = texUnit->_Current->DepthMode; |
| } |
| |
| switch (texUnit->EnvMode) { |
| case GL_REPLACE: |
| switch (format) { |
| case GL_ALPHA: |
| for (i=0;i<n;i++) { |
| /* Cv = Cf */ |
| /* Av = At */ |
| rgba[i][ACOMP] = texel[i][ACOMP]; |
| } |
| break; |
| case GL_LUMINANCE: |
| for (i=0;i<n;i++) { |
| /* Cv = Lt */ |
| GLchan Lt = texel[i][RCOMP]; |
| rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = Lt; |
| /* Av = Af */ |
| } |
| break; |
| case GL_LUMINANCE_ALPHA: |
| for (i=0;i<n;i++) { |
| GLchan Lt = texel[i][RCOMP]; |
| /* Cv = Lt */ |
| rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = Lt; |
| /* Av = At */ |
| rgba[i][ACOMP] = texel[i][ACOMP]; |
| } |
| break; |
| case GL_INTENSITY: |
| for (i=0;i<n;i++) { |
| /* Cv = It */ |
| GLchan It = texel[i][RCOMP]; |
| rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = It; |
| /* Av = It */ |
| rgba[i][ACOMP] = It; |
| } |
| break; |
| case GL_RGB: |
| for (i=0;i<n;i++) { |
| /* Cv = Ct */ |
| rgba[i][RCOMP] = texel[i][RCOMP]; |
| rgba[i][GCOMP] = texel[i][GCOMP]; |
| rgba[i][BCOMP] = texel[i][BCOMP]; |
| /* Av = Af */ |
| } |
| break; |
| case GL_RGBA: |
| for (i=0;i<n;i++) { |
| /* Cv = Ct */ |
| rgba[i][RCOMP] = texel[i][RCOMP]; |
| rgba[i][GCOMP] = texel[i][GCOMP]; |
| rgba[i][BCOMP] = texel[i][BCOMP]; |
| /* Av = At */ |
| rgba[i][ACOMP] = texel[i][ACOMP]; |
| } |
| break; |
| default: |
| _mesa_problem(ctx, "Bad format (GL_REPLACE) in texture_apply"); |
| return; |
| } |
| break; |
| |
| case GL_MODULATE: |
| switch (format) { |
| case GL_ALPHA: |
| for (i=0;i<n;i++) { |
| /* Cv = Cf */ |
| /* Av = AfAt */ |
| rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] ); |
| } |
| break; |
| case GL_LUMINANCE: |
| for (i=0;i<n;i++) { |
| /* Cv = LtCf */ |
| GLchan Lt = texel[i][RCOMP]; |
| rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], Lt ); |
| rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], Lt ); |
| rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], Lt ); |
| /* Av = Af */ |
| } |
| break; |
| case GL_LUMINANCE_ALPHA: |
| for (i=0;i<n;i++) { |
| /* Cv = CfLt */ |
| GLchan Lt = texel[i][RCOMP]; |
| rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], Lt ); |
| rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], Lt ); |
| rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], Lt ); |
| /* Av = AfAt */ |
| rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] ); |
| } |
| break; |
| case GL_INTENSITY: |
| for (i=0;i<n;i++) { |
| /* Cv = CfIt */ |
| GLchan It = texel[i][RCOMP]; |
| rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], It ); |
| rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], It ); |
| rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], It ); |
| /* Av = AfIt */ |
| rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], It ); |
| } |
| break; |
| case GL_RGB: |
| for (i=0;i<n;i++) { |
| /* Cv = CfCt */ |
| rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], texel[i][RCOMP] ); |
| rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], texel[i][GCOMP] ); |
| rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], texel[i][BCOMP] ); |
| /* Av = Af */ |
| } |
| break; |
| case GL_RGBA: |
| for (i=0;i<n;i++) { |
| /* Cv = CfCt */ |
| rgba[i][RCOMP] = CHAN_PRODUCT( rgba[i][RCOMP], texel[i][RCOMP] ); |
| rgba[i][GCOMP] = CHAN_PRODUCT( rgba[i][GCOMP], texel[i][GCOMP] ); |
| rgba[i][BCOMP] = CHAN_PRODUCT( rgba[i][BCOMP], texel[i][BCOMP] ); |
| /* Av = AfAt */ |
| rgba[i][ACOMP] = CHAN_PRODUCT( rgba[i][ACOMP], texel[i][ACOMP] ); |
| } |
| break; |
| default: |
| _mesa_problem(ctx, "Bad format (GL_MODULATE) in texture_apply"); |
| return; |
| } |
| break; |
| |
| case GL_DECAL: |
| switch (format) { |
| case GL_ALPHA: |
| case GL_LUMINANCE: |
| case GL_LUMINANCE_ALPHA: |
| case GL_INTENSITY: |
| /* undefined */ |
| break; |
| case GL_RGB: |
| for (i=0;i<n;i++) { |
| /* Cv = Ct */ |
| rgba[i][RCOMP] = texel[i][RCOMP]; |
| rgba[i][GCOMP] = texel[i][GCOMP]; |
| rgba[i][BCOMP] = texel[i][BCOMP]; |
| /* Av = Af */ |
| } |
| break; |
| case GL_RGBA: |
| for (i=0;i<n;i++) { |
| /* Cv = Cf(1-At) + CtAt */ |
| GLchan t = texel[i][ACOMP], s = CHAN_MAX - t; |
| rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(texel[i][RCOMP],t); |
| rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(texel[i][GCOMP],t); |
| rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(texel[i][BCOMP],t); |
| /* Av = Af */ |
| } |
| break; |
| default: |
| _mesa_problem(ctx, "Bad format (GL_DECAL) in texture_apply"); |
| return; |
| } |
| break; |
| |
| case GL_BLEND: |
| UNCLAMPED_FLOAT_TO_CHAN(Rc, texUnit->EnvColor[0]); |
| UNCLAMPED_FLOAT_TO_CHAN(Gc, texUnit->EnvColor[1]); |
| UNCLAMPED_FLOAT_TO_CHAN(Bc, texUnit->EnvColor[2]); |
| UNCLAMPED_FLOAT_TO_CHAN(Ac, texUnit->EnvColor[3]); |
| switch (format) { |
| case GL_ALPHA: |
| for (i=0;i<n;i++) { |
| /* Cv = Cf */ |
| /* Av = AfAt */ |
| rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]); |
| } |
| break; |
| case GL_LUMINANCE: |
| for (i=0;i<n;i++) { |
| /* Cv = Cf(1-Lt) + CcLt */ |
| GLchan Lt = texel[i][RCOMP], s = CHAN_MAX - Lt; |
| rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, Lt); |
| rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, Lt); |
| rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, Lt); |
| /* Av = Af */ |
| } |
| break; |
| case GL_LUMINANCE_ALPHA: |
| for (i=0;i<n;i++) { |
| /* Cv = Cf(1-Lt) + CcLt */ |
| GLchan Lt = texel[i][RCOMP], s = CHAN_MAX - Lt; |
| rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, Lt); |
| rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, Lt); |
| rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, Lt); |
| /* Av = AfAt */ |
| rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP],texel[i][ACOMP]); |
| } |
| break; |
| case GL_INTENSITY: |
| for (i=0;i<n;i++) { |
| /* Cv = Cf(1-It) + CcIt */ |
| GLchan It = texel[i][RCOMP], s = CHAN_MAX - It; |
| rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], s) + CHAN_PRODUCT(Rc, It); |
| rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], s) + CHAN_PRODUCT(Gc, It); |
| rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], s) + CHAN_PRODUCT(Bc, It); |
| /* Av = Af(1-It) + Ac*It */ |
| rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], s) + CHAN_PRODUCT(Ac, It); |
| } |
| break; |
| case GL_RGB: |
| for (i=0;i<n;i++) { |
| /* Cv = Cf(1-Ct) + CcCt */ |
| rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], (CHAN_MAX-texel[i][RCOMP])) + CHAN_PRODUCT(Rc,texel[i][RCOMP]); |
| rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], (CHAN_MAX-texel[i][GCOMP])) + CHAN_PRODUCT(Gc,texel[i][GCOMP]); |
| rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], (CHAN_MAX-texel[i][BCOMP])) + CHAN_PRODUCT(Bc,texel[i][BCOMP]); |
| /* Av = Af */ |
| } |
| break; |
| case GL_RGBA: |
| for (i=0;i<n;i++) { |
| /* Cv = Cf(1-Ct) + CcCt */ |
| rgba[i][RCOMP] = CHAN_PRODUCT(rgba[i][RCOMP], (CHAN_MAX-texel[i][RCOMP])) + CHAN_PRODUCT(Rc,texel[i][RCOMP]); |
| rgba[i][GCOMP] = CHAN_PRODUCT(rgba[i][GCOMP], (CHAN_MAX-texel[i][GCOMP])) + CHAN_PRODUCT(Gc,texel[i][GCOMP]); |
| rgba[i][BCOMP] = CHAN_PRODUCT(rgba[i][BCOMP], (CHAN_MAX-texel[i][BCOMP])) + CHAN_PRODUCT(Bc,texel[i][BCOMP]); |
| /* Av = AfAt */ |
| rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP],texel[i][ACOMP]); |
| } |
| break; |
| default: |
| _mesa_problem(ctx, "Bad format (GL_BLEND) in texture_apply"); |
| return; |
| } |
| break; |
| |
| /* XXX don't clamp results if GLchan is float??? */ |
| |
| case GL_ADD: /* GL_EXT_texture_add_env */ |
| switch (format) { |
| case GL_ALPHA: |
| for (i=0;i<n;i++) { |
| /* Rv = Rf */ |
| /* Gv = Gf */ |
| /* Bv = Bf */ |
| rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]); |
| } |
| break; |
| case GL_LUMINANCE: |
| for (i=0;i<n;i++) { |
| ChanTemp Lt = texel[i][RCOMP]; |
| ChanTemp r = rgba[i][RCOMP] + Lt; |
| ChanTemp g = rgba[i][GCOMP] + Lt; |
| ChanTemp b = rgba[i][BCOMP] + Lt; |
| rgba[i][RCOMP] = MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = MIN2(b, CHAN_MAX); |
| /* Av = Af */ |
| } |
| break; |
| case GL_LUMINANCE_ALPHA: |
| for (i=0;i<n;i++) { |
| ChanTemp Lt = texel[i][RCOMP]; |
| ChanTemp r = rgba[i][RCOMP] + Lt; |
| ChanTemp g = rgba[i][GCOMP] + Lt; |
| ChanTemp b = rgba[i][BCOMP] + Lt; |
| rgba[i][RCOMP] = MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = MIN2(b, CHAN_MAX); |
| rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]); |
| } |
| break; |
| case GL_INTENSITY: |
| for (i=0;i<n;i++) { |
| GLchan It = texel[i][RCOMP]; |
| ChanTemp r = rgba[i][RCOMP] + It; |
| ChanTemp g = rgba[i][GCOMP] + It; |
| ChanTemp b = rgba[i][BCOMP] + It; |
| ChanTemp a = rgba[i][ACOMP] + It; |
| rgba[i][RCOMP] = MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = MIN2(b, CHAN_MAX); |
| rgba[i][ACOMP] = MIN2(a, CHAN_MAX); |
| } |
| break; |
| case GL_RGB: |
| for (i=0;i<n;i++) { |
| ChanTemp r = rgba[i][RCOMP] + texel[i][RCOMP]; |
| ChanTemp g = rgba[i][GCOMP] + texel[i][GCOMP]; |
| ChanTemp b = rgba[i][BCOMP] + texel[i][BCOMP]; |
| rgba[i][RCOMP] = MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = MIN2(b, CHAN_MAX); |
| /* Av = Af */ |
| } |
| break; |
| case GL_RGBA: |
| for (i=0;i<n;i++) { |
| ChanTemp r = rgba[i][RCOMP] + texel[i][RCOMP]; |
| ChanTemp g = rgba[i][GCOMP] + texel[i][GCOMP]; |
| ChanTemp b = rgba[i][BCOMP] + texel[i][BCOMP]; |
| rgba[i][RCOMP] = MIN2(r, CHAN_MAX); |
| rgba[i][GCOMP] = MIN2(g, CHAN_MAX); |
| rgba[i][BCOMP] = MIN2(b, CHAN_MAX); |
| rgba[i][ACOMP] = CHAN_PRODUCT(rgba[i][ACOMP], texel[i][ACOMP]); |
| } |
| break; |
| default: |
| _mesa_problem(ctx, "Bad format (GL_ADD) in texture_apply"); |
| return; |
| } |
| break; |
| |
| default: |
| _mesa_problem(ctx, "Bad env mode in texture_apply"); |
| return; |
| } |
| } |
| |
| |
| |
| /** |
| * Apply texture mapping to a span of fragments. |
| */ |
| void |
| _swrast_texture_span( GLcontext *ctx, SWspan *span ) |
| { |
| SWcontext *swrast = SWRAST_CONTEXT(ctx); |
| GLchan primary_rgba[MAX_WIDTH][4]; |
| GLuint unit; |
| |
| ASSERT(span->end < MAX_WIDTH); |
| |
| /* |
| * 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 GLfloat (*texcoords)[4] |
| = (const GLfloat (*)[4]) |
| span->array->attribs[FRAG_ATTRIB_TEX0 + unit]; |
| const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit]; |
| const struct gl_texture_object *curObj = texUnit->_Current; |
| GLfloat *lambda = span->array->lambda[unit]; |
| GLchan (*texels)[4] = (GLchan (*)[4]) |
| (swrast->TexelBuffer + unit * (span->end * 4 * sizeof(GLchan))); |
| |
| /* adjust texture lod (lambda) */ |
| if (span->arrayMask & SPAN_LAMBDA) { |
| if (texUnit->LodBias + curObj->LodBias != 0.0F) { |
| /* apply LOD bias, but don't clamp yet */ |
| const GLfloat bias = CLAMP(texUnit->LodBias + curObj->LodBias, |
| -ctx->Const.MaxTextureLodBias, |
| ctx->Const.MaxTextureLodBias); |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| lambda[i] += bias; |
| } |
| } |
| |
| if (curObj->MinLod != -1000.0 || curObj->MaxLod != 1000.0) { |
| /* apply LOD clamping to lambda */ |
| const GLfloat min = curObj->MinLod; |
| const GLfloat max = curObj->MaxLod; |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| GLfloat l = lambda[i]; |
| lambda[i] = CLAMP(l, min, max); |
| } |
| } |
| } |
| |
| /* Sample the texture (span->end = number of fragments) */ |
| swrast->TextureSample[unit]( ctx, texUnit->_Current, span->end, |
| texcoords, lambda, texels ); |
| |
| /* GL_SGI_texture_color_table */ |
| if (texUnit->ColorTableEnabled) { |
| #if CHAN_TYPE == GL_UNSIGNED_BYTE |
| _mesa_lookup_rgba_ubyte(&texUnit->ColorTable, span->end, texels); |
| #elif CHAN_TYPE == GL_UNSIGNED_SHORT |
| _mesa_lookup_rgba_ubyte(&texUnit->ColorTable, span->end, texels); |
| #else |
| _mesa_lookup_rgba_float(&texUnit->ColorTable, span->end, texels); |
| #endif |
| } |
| } |
| } |
| |
| /* |
| * 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 ); |
| } |
| } |
| } |
| } |
