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-rw-r--r--mesalib/src/mesa/swrast/s_texcombine.c710
1 files changed, 710 insertions, 0 deletions
diff --git a/mesalib/src/mesa/swrast/s_texcombine.c b/mesalib/src/mesa/swrast/s_texcombine.c
new file mode 100644
index 000000000..889164b98
--- /dev/null
+++ b/mesalib/src/mesa/swrast/s_texcombine.c
@@ -0,0 +1,710 @@
+/*
+ * Mesa 3-D graphics library
+ * Version: 7.5
+ *
+ * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
+ * Copyright (C) 2009 VMware, Inc. 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 "main/glheader.h"
+#include "main/context.h"
+#include "main/colormac.h"
+#include "main/image.h"
+#include "main/imports.h"
+#include "main/pixel.h"
+#include "shader/prog_instruction.h"
+
+#include "s_context.h"
+#include "s_texcombine.h"
+
+
+/**
+ * Pointer to array of float[4]
+ * This type makes the code below more concise and avoids a lot of casting.
+ */
+typedef float (*float4_array)[4];
+
+
+/**
+ * Return array of texels for given unit.
+ */
+static INLINE float4_array
+get_texel_array(SWcontext *swrast, GLuint unit)
+{
+ return (float4_array) (swrast->TexelBuffer + unit * MAX_WIDTH * 4);
+}
+
+
+
+/**
+ * Do texture application for:
+ * GL_EXT_texture_env_combine
+ * GL_ARB_texture_env_combine
+ * GL_EXT_texture_env_dot3
+ * GL_ARB_texture_env_dot3
+ * GL_ATI_texture_env_combine3
+ * GL_NV_texture_env_combine4
+ * conventional GL texture env modes
+ *
+ * \param ctx rendering context
+ * \param unit the texture combiner unit
+ * \param n number of fragments to process (span width)
+ * \param primary_rgba incoming fragment color array
+ * \param texelBuffer pointer to texel colors for all texture units
+ *
+ * \param rgba incoming/result fragment colors
+ */
+static void
+texture_combine( GLcontext *ctx, GLuint unit, GLuint n,
+ const float4_array primary_rgba,
+ const GLfloat *texelBuffer,
+ GLchan (*rgbaChan)[4] )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ const struct gl_texture_unit *textureUnit = &(ctx->Texture.Unit[unit]);
+ const struct gl_tex_env_combine_state *combine = textureUnit->_CurrentCombine;
+ float4_array argRGB[MAX_COMBINER_TERMS];
+ float4_array argA[MAX_COMBINER_TERMS];
+ const GLfloat scaleRGB = (GLfloat) (1 << combine->ScaleShiftRGB);
+ const GLfloat scaleA = (GLfloat) (1 << combine->ScaleShiftA);
+ const GLuint numArgsRGB = combine->_NumArgsRGB;
+ const GLuint numArgsA = combine->_NumArgsA;
+ GLfloat ccolor[MAX_COMBINER_TERMS][MAX_WIDTH][4]; /* temp color buffers */
+ GLfloat rgba[MAX_WIDTH][4];
+ GLuint i, term;
+
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = CHAN_TO_FLOAT(rgbaChan[i][RCOMP]);
+ rgba[i][GCOMP] = CHAN_TO_FLOAT(rgbaChan[i][GCOMP]);
+ rgba[i][BCOMP] = CHAN_TO_FLOAT(rgbaChan[i][BCOMP]);
+ rgba[i][ACOMP] = CHAN_TO_FLOAT(rgbaChan[i][ACOMP]);
+ }
+
+ /*
+ printf("modeRGB 0x%x modeA 0x%x srcRGB1 0x%x srcA1 0x%x srcRGB2 0x%x srcA2 0x%x\n",
+ combine->ModeRGB,
+ combine->ModeA,
+ combine->SourceRGB[0],
+ combine->SourceA[0],
+ combine->SourceRGB[1],
+ combine->SourceA[1]);
+ */
+
+ /*
+ * Do operand setup for up to 4 operands. Loop over the terms.
+ */
+ for (term = 0; term < numArgsRGB; term++) {
+ const GLenum srcRGB = combine->SourceRGB[term];
+ const GLenum operandRGB = combine->OperandRGB[term];
+
+ switch (srcRGB) {
+ case GL_TEXTURE:
+ argRGB[term] = get_texel_array(swrast, unit);
+ break;
+ case GL_PRIMARY_COLOR:
+ argRGB[term] = primary_rgba;
+ break;
+ case GL_PREVIOUS:
+ argRGB[term] = rgba;
+ break;
+ case GL_CONSTANT:
+ {
+ float4_array c = ccolor[term];
+ GLfloat red = textureUnit->EnvColor[0];
+ GLfloat green = textureUnit->EnvColor[1];
+ GLfloat blue = textureUnit->EnvColor[2];
+ GLfloat alpha = textureUnit->EnvColor[3];
+ for (i = 0; i < n; i++) {
+ ASSIGN_4V(c[i], red, green, blue, alpha);
+ }
+ argRGB[term] = ccolor[term];
+ }
+ break;
+ /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
+ */
+ case GL_ZERO:
+ {
+ float4_array c = ccolor[term];
+ for (i = 0; i < n; i++) {
+ ASSIGN_4V(c[i], 0.0F, 0.0F, 0.0F, 0.0F);
+ }
+ argRGB[term] = ccolor[term];
+ }
+ break;
+ case GL_ONE:
+ {
+ float4_array c = ccolor[term];
+ for (i = 0; i < n; i++) {
+ ASSIGN_4V(c[i], 1.0F, 1.0F, 1.0F, 1.0F);
+ }
+ argRGB[term] = ccolor[term];
+ }
+ 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[term] = get_texel_array(swrast, srcUnit);
+ }
+ }
+
+ if (operandRGB != GL_SRC_COLOR) {
+ float4_array src = argRGB[term];
+ float4_array dst = ccolor[term];
+
+ /* point to new arg[term] storage */
+ argRGB[term] = ccolor[term];
+
+ switch (operandRGB) {
+ case GL_ONE_MINUS_SRC_COLOR:
+ for (i = 0; i < n; i++) {
+ dst[i][RCOMP] = 1.0F - src[i][RCOMP];
+ dst[i][GCOMP] = 1.0F - src[i][GCOMP];
+ dst[i][BCOMP] = 1.0F - src[i][BCOMP];
+ }
+ break;
+ case GL_SRC_ALPHA:
+ for (i = 0; i < n; i++) {
+ dst[i][RCOMP] =
+ dst[i][GCOMP] =
+ dst[i][BCOMP] = src[i][ACOMP];
+ }
+ break;
+ case GL_ONE_MINUS_SRC_ALPHA:
+ for (i = 0; i < n; i++) {
+ dst[i][RCOMP] =
+ dst[i][GCOMP] =
+ dst[i][BCOMP] = 1.0F - src[i][ACOMP];
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad operandRGB");
+ }
+ }
+ }
+
+ /*
+ * Set up the argA[term] pointers
+ */
+ for (term = 0; term < numArgsA; term++) {
+ const GLenum srcA = combine->SourceA[term];
+ const GLenum operandA = combine->OperandA[term];
+
+ switch (srcA) {
+ case GL_TEXTURE:
+ argA[term] = get_texel_array(swrast, unit);
+ break;
+ case GL_PRIMARY_COLOR:
+ argA[term] = primary_rgba;
+ break;
+ case GL_PREVIOUS:
+ argA[term] = rgba;
+ break;
+ case GL_CONSTANT:
+ {
+ float4_array c = ccolor[term];
+ GLfloat alpha = textureUnit->EnvColor[3];
+ for (i = 0; i < n; i++)
+ c[i][ACOMP] = alpha;
+ argA[term] = ccolor[term];
+ }
+ break;
+ /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources.
+ */
+ case GL_ZERO:
+ {
+ float4_array c = ccolor[term];
+ for (i = 0; i < n; i++)
+ c[i][ACOMP] = 0.0F;
+ argA[term] = ccolor[term];
+ }
+ break;
+ case GL_ONE:
+ {
+ float4_array c = ccolor[term];
+ for (i = 0; i < n; i++)
+ c[i][ACOMP] = 1.0F;
+ argA[term] = ccolor[term];
+ }
+ 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[term] = get_texel_array(swrast, srcUnit);
+ }
+ }
+
+ if (operandA == GL_ONE_MINUS_SRC_ALPHA) {
+ float4_array src = argA[term];
+ float4_array dst = ccolor[term];
+ argA[term] = ccolor[term];
+ for (i = 0; i < n; i++) {
+ dst[i][ACOMP] = 1.0F - src[i][ACOMP];
+ }
+ }
+ }
+
+ /* RGB channel combine */
+ {
+ float4_array arg0 = argRGB[0];
+ float4_array arg1 = argRGB[1];
+ float4_array arg2 = argRGB[2];
+ float4_array arg3 = argRGB[3];
+
+ switch (combine->ModeRGB) {
+ case GL_REPLACE:
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = arg0[i][RCOMP] * scaleRGB;
+ rgba[i][GCOMP] = arg0[i][GCOMP] * scaleRGB;
+ rgba[i][BCOMP] = arg0[i][BCOMP] * scaleRGB;
+ }
+ break;
+ case GL_MODULATE:
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = arg0[i][RCOMP] * arg1[i][RCOMP] * scaleRGB;
+ rgba[i][GCOMP] = arg0[i][GCOMP] * arg1[i][GCOMP] * scaleRGB;
+ rgba[i][BCOMP] = arg0[i][BCOMP] * arg1[i][BCOMP] * scaleRGB;
+ }
+ break;
+ case GL_ADD:
+ if (textureUnit->EnvMode == GL_COMBINE4_NV) {
+ /* (a * b) + (c * d) */
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = (arg0[i][RCOMP] * arg1[i][RCOMP] +
+ arg2[i][RCOMP] * arg3[i][RCOMP]) * scaleRGB;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] * arg1[i][GCOMP] +
+ arg2[i][GCOMP] * arg3[i][GCOMP]) * scaleRGB;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] * arg1[i][BCOMP] +
+ arg2[i][BCOMP] * arg3[i][BCOMP]) * scaleRGB;
+ }
+ }
+ else {
+ /* 2-term addition */
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP]) * scaleRGB;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP]) * scaleRGB;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP]) * scaleRGB;
+ }
+ }
+ break;
+ case GL_ADD_SIGNED:
+ if (textureUnit->EnvMode == GL_COMBINE4_NV) {
+ /* (a * b) + (c * d) - 0.5 */
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = (arg0[i][RCOMP] * arg1[i][RCOMP] +
+ arg2[i][RCOMP] * arg3[i][RCOMP] - 0.5) * scaleRGB;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] * arg1[i][GCOMP] +
+ arg2[i][GCOMP] * arg3[i][GCOMP] - 0.5) * scaleRGB;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] * arg1[i][BCOMP] +
+ arg2[i][BCOMP] * arg3[i][BCOMP] - 0.5) * scaleRGB;
+ }
+ }
+ else {
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP] - 0.5) * scaleRGB;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] - 0.5) * scaleRGB;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] - 0.5) * scaleRGB;
+ }
+ }
+ break;
+ case GL_INTERPOLATE:
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = (arg0[i][RCOMP] * arg2[i][RCOMP] +
+ arg1[i][RCOMP] * (1.0F - arg2[i][RCOMP])) * scaleRGB;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] * arg2[i][GCOMP] +
+ arg1[i][GCOMP] * (1.0F - arg2[i][GCOMP])) * scaleRGB;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] * arg2[i][BCOMP] +
+ arg1[i][BCOMP] * (1.0F - arg2[i][BCOMP])) * scaleRGB;
+ }
+ break;
+ case GL_SUBTRACT:
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = (arg0[i][RCOMP] - arg1[i][RCOMP]) * scaleRGB;
+ rgba[i][GCOMP] = (arg0[i][GCOMP] - arg1[i][GCOMP]) * scaleRGB;
+ rgba[i][BCOMP] = (arg0[i][BCOMP] - arg1[i][BCOMP]) * scaleRGB;
+ }
+ break;
+ case GL_DOT3_RGB_EXT:
+ case GL_DOT3_RGBA_EXT:
+ /* Do not scale the result by 1 2 or 4 */
+ for (i = 0; i < n; i++) {
+ GLfloat dot = ((arg0[i][RCOMP] - 0.5F) * (arg1[i][RCOMP] - 0.5F) +
+ (arg0[i][GCOMP] - 0.5F) * (arg1[i][GCOMP] - 0.5F) +
+ (arg0[i][BCOMP] - 0.5F) * (arg1[i][BCOMP] - 0.5F))
+ * 4.0F;
+ dot = CLAMP(dot, 0.0F, 1.0F);
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = dot;
+ }
+ break;
+ case GL_DOT3_RGB:
+ case GL_DOT3_RGBA:
+ /* DO scale the result by 1 2 or 4 */
+ for (i = 0; i < n; i++) {
+ GLfloat dot = ((arg0[i][RCOMP] - 0.5F) * (arg1[i][RCOMP] - 0.5F) +
+ (arg0[i][GCOMP] - 0.5F) * (arg1[i][GCOMP] - 0.5F) +
+ (arg0[i][BCOMP] - 0.5F) * (arg1[i][BCOMP] - 0.5F))
+ * 4.0F * scaleRGB;
+ dot = CLAMP(dot, 0.0, 1.0F);
+ rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = dot;
+ }
+ break;
+ case GL_MODULATE_ADD_ATI:
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) +
+ arg1[i][RCOMP]) * scaleRGB;
+ rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) +
+ arg1[i][GCOMP]) * scaleRGB;
+ rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) +
+ arg1[i][BCOMP]) * scaleRGB;
+ }
+ break;
+ case GL_MODULATE_SIGNED_ADD_ATI:
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) +
+ arg1[i][RCOMP] - 0.5) * scaleRGB;
+ rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) +
+ arg1[i][GCOMP] - 0.5) * scaleRGB;
+ rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) +
+ arg1[i][BCOMP] - 0.5) * scaleRGB;
+ }
+ break;
+ case GL_MODULATE_SUBTRACT_ATI:
+ for (i = 0; i < n; i++) {
+ rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) -
+ arg1[i][RCOMP]) * scaleRGB;
+ rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) -
+ arg1[i][GCOMP]) * scaleRGB;
+ rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) -
+ arg1[i][BCOMP]) * scaleRGB;
+ }
+ break;
+ case GL_BUMP_ENVMAP_ATI:
+ /* this produces a fixed rgba color, and the coord calc is done elsewhere */
+ for (i = 0; i < n; i++) {
+ /* rgba result is 0,0,0,1 */
+ rgba[i][RCOMP] = 0.0;
+ rgba[i][GCOMP] = 0.0;
+ rgba[i][BCOMP] = 0.0;
+ rgba[i][ACOMP] = 1.0;
+ }
+ return; /* no alpha processing */
+ default:
+ _mesa_problem(ctx, "invalid combine mode");
+ }
+ }
+
+ /* Alpha channel combine */
+ {
+ float4_array arg0 = argA[0];
+ float4_array arg1 = argA[1];
+ float4_array arg2 = argA[2];
+ float4_array arg3 = argA[3];
+
+ switch (combine->ModeA) {
+ case GL_REPLACE:
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = arg0[i][ACOMP] * scaleA;
+ }
+ break;
+ case GL_MODULATE:
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * scaleA;
+ }
+ break;
+ case GL_ADD:
+ if (textureUnit->EnvMode == GL_COMBINE4_NV) {
+ /* (a * b) + (c * d) */
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = (arg0[i][ACOMP] * arg1[i][ACOMP] +
+ arg2[i][ACOMP] * arg3[i][ACOMP]) * scaleA;
+ }
+ }
+ else {
+ /* two-term add */
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP]) * scaleA;
+ }
+ }
+ break;
+ case GL_ADD_SIGNED:
+ if (textureUnit->EnvMode == GL_COMBINE4_NV) {
+ /* (a * b) + (c * d) - 0.5 */
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = (arg0[i][ACOMP] * arg1[i][ACOMP] +
+ arg2[i][ACOMP] * arg3[i][ACOMP] -
+ 0.5) * scaleA;
+ }
+ }
+ else {
+ /* a + b - 0.5 */
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * scaleA;
+ }
+ }
+ break;
+ case GL_INTERPOLATE:
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = (arg0[i][ACOMP] * arg2[i][ACOMP] +
+ arg1[i][ACOMP] * (1.0F - arg2[i][ACOMP]))
+ * scaleA;
+ }
+ break;
+ case GL_SUBTRACT:
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = (arg0[i][ACOMP] - arg1[i][ACOMP]) * scaleA;
+ }
+ break;
+ case GL_MODULATE_ADD_ATI:
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP])
+ + arg1[i][ACOMP]) * scaleA;
+ }
+ break;
+ case GL_MODULATE_SIGNED_ADD_ATI:
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) +
+ arg1[i][ACOMP] - 0.5F) * scaleA;
+ }
+ break;
+ case GL_MODULATE_SUBTRACT_ATI:
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP])
+ - arg1[i][ACOMP]) * scaleA;
+ }
+ 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 (combine->ModeRGB == GL_DOT3_RGBA_EXT ||
+ combine->ModeRGB == GL_DOT3_RGBA) {
+ for (i = 0; i < n; i++) {
+ rgba[i][ACOMP] = rgba[i][RCOMP];
+ }
+ }
+
+ for (i = 0; i < n; i++) {
+ UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][RCOMP], rgba[i][RCOMP]);
+ UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][GCOMP], rgba[i][GCOMP]);
+ UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][BCOMP], rgba[i][BCOMP]);
+ UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][ACOMP], rgba[i][ACOMP]);
+ }
+}
+
+
+/**
+ * Apply X/Y/Z/W/0/1 swizzle to an array of colors/texels.
+ * See GL_EXT_texture_swizzle.
+ */
+static void
+swizzle_texels(GLuint swizzle, GLuint count, float4_array texels)
+{
+ const GLuint swzR = GET_SWZ(swizzle, 0);
+ const GLuint swzG = GET_SWZ(swizzle, 1);
+ const GLuint swzB = GET_SWZ(swizzle, 2);
+ const GLuint swzA = GET_SWZ(swizzle, 3);
+ GLfloat vector[6];
+ GLuint i;
+
+ vector[SWIZZLE_ZERO] = 0;
+ vector[SWIZZLE_ONE] = 1.0F;
+
+ for (i = 0; i < count; i++) {
+ vector[SWIZZLE_X] = texels[i][0];
+ vector[SWIZZLE_Y] = texels[i][1];
+ vector[SWIZZLE_Z] = texels[i][2];
+ vector[SWIZZLE_W] = texels[i][3];
+ texels[i][RCOMP] = vector[swzR];
+ texels[i][GCOMP] = vector[swzG];
+ texels[i][BCOMP] = vector[swzB];
+ texels[i][ACOMP] = vector[swzA];
+ }
+}
+
+
+/**
+ * Apply texture mapping to a span of fragments.
+ */
+void
+_swrast_texture_span( GLcontext *ctx, SWspan *span )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ GLfloat 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->_TextureCombinePrimary) {
+ GLuint i;
+ for (i = 0; i < span->end; i++) {
+ primary_rgba[i][RCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][RCOMP]);
+ primary_rgba[i][GCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][GCOMP]);
+ primary_rgba[i][BCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][BCOMP]);
+ primary_rgba[i][ACOMP] = CHAN_TO_FLOAT(span->array->rgba[i][ACOMP]);
+ }
+ }
+
+ /* First must sample all bump maps */
+ for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
+ const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
+
+ if (texUnit->_ReallyEnabled &&
+ texUnit->_CurrentCombine->ModeRGB == GL_BUMP_ENVMAP_ATI) {
+ const GLfloat (*texcoords)[4] = (const GLfloat (*)[4])
+ span->array->attribs[FRAG_ATTRIB_TEX0 + unit];
+ float4_array targetcoords =
+ span->array->attribs[FRAG_ATTRIB_TEX0 +
+ ctx->Texture.Unit[unit].BumpTarget - GL_TEXTURE0];
+
+ const struct gl_texture_object *curObj = texUnit->_Current;
+ GLfloat *lambda = span->array->lambda[unit];
+ float4_array texels = get_texel_array(swrast, unit);
+ GLuint i;
+ GLfloat rotMatrix00 = ctx->Texture.Unit[unit].RotMatrix[0];
+ GLfloat rotMatrix01 = ctx->Texture.Unit[unit].RotMatrix[1];
+ GLfloat rotMatrix10 = ctx->Texture.Unit[unit].RotMatrix[2];
+ GLfloat rotMatrix11 = ctx->Texture.Unit[unit].RotMatrix[3];
+
+ /* 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 );
+
+ /* manipulate the span values of the bump target
+ not sure this can work correctly even ignoring
+ the problem that channel is unsigned */
+ for (i = 0; i < span->end; i++) {
+ targetcoords[i][0] += (texels[i][0] * rotMatrix00 + texels[i][1] *
+ rotMatrix01) / targetcoords[i][3];
+ targetcoords[i][1] += (texels[i][0] * rotMatrix10 + texels[i][1] *
+ rotMatrix11) / targetcoords[i][3];
+ }
+ }
+ }
+
+ /*
+ * Must do all texture sampling before combining in order to
+ * accomodate GL_ARB_texture_env_crossbar.
+ */
+ for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) {
+ const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
+ if (texUnit->_ReallyEnabled &&
+ texUnit->_CurrentCombine->ModeRGB != GL_BUMP_ENVMAP_ATI) {
+ const GLfloat (*texcoords)[4] = (const GLfloat (*)[4])
+ span->array->attribs[FRAG_ATTRIB_TEX0 + unit];
+ const struct gl_texture_object *curObj = texUnit->_Current;
+ GLfloat *lambda = span->array->lambda[unit];
+ float4_array texels = get_texel_array(swrast, unit);
+
+ /* 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) {
+ _mesa_lookup_rgba_float(&texUnit->ColorTable, span->end, texels);
+ }
+
+ /* GL_EXT_texture_swizzle */
+ if (curObj->_Swizzle != SWIZZLE_NOOP) {
+ swizzle_texels(curObj->_Swizzle, 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) {
+ texture_combine( ctx, unit, span->end,
+ primary_rgba,
+ swrast->TexelBuffer,
+ span->array->rgba );
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-12 01:57:04 +0000