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-rw-r--r--mesalib/src/mesa/swrast/s_blend.c2024
1 files changed, 1010 insertions, 1014 deletions
diff --git a/mesalib/src/mesa/swrast/s_blend.c b/mesalib/src/mesa/swrast/s_blend.c
index 125364913..3760f91d6 100644
--- a/mesalib/src/mesa/swrast/s_blend.c
+++ b/mesalib/src/mesa/swrast/s_blend.c
@@ -1,1014 +1,1010 @@
-/*
- * Mesa 3-D graphics library
- * Version: 7.1
- *
- * Copyright (C) 1999-2008 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.
- */
-
-
-/**
- * \file swrast/s_blend.c
- * \brief software blending.
- * \author Brian Paul
- *
- * Only a few blend modes have been optimized (min, max, transparency, add)
- * more optimized cases can easily be added if needed.
- * Celestia uses glBlendFunc(GL_SRC_ALPHA, GL_ONE), for example.
- */
-
-
-
-#include "main/glheader.h"
-#include "main/context.h"
-#include "main/colormac.h"
-#include "main/macros.h"
-
-#include "s_blend.h"
-#include "s_context.h"
-#include "s_span.h"
-
-
-#if defined(USE_MMX_ASM)
-#include "x86/mmx.h"
-#include "x86/common_x86_asm.h"
-#define _BLENDAPI _ASMAPI
-#else
-#define _BLENDAPI
-#endif
-
-
-/**
- * Integer divide by 255
- * Declare "int divtemp" before using.
- * This satisfies Glean and should be reasonably fast.
- * Contributed by Nathan Hand.
- */
-#define DIV255(X) (divtemp = (X), ((divtemp << 8) + divtemp + 256) >> 16)
-
-
-
-/**
- * Special case for glBlendFunc(GL_ZERO, GL_ONE).
- * No-op means the framebuffer values remain unchanged.
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_noop(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
- GLint bytes;
-
- ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].SrcRGB == GL_ZERO);
- ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE);
- (void) ctx;
-
- /* just memcpy */
- if (chanType == GL_UNSIGNED_BYTE)
- bytes = 4 * n * sizeof(GLubyte);
- else if (chanType == GL_UNSIGNED_SHORT)
- bytes = 4 * n * sizeof(GLushort);
- else
- bytes = 4 * n * sizeof(GLfloat);
-
- memcpy(src, dst, bytes);
-}
-
-
-/**
- * Special case for glBlendFunc(GL_ONE, GL_ZERO)
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_replace(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
- ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].SrcRGB == GL_ONE);
- ASSERT(ctx->Color.Blend[0].DstRGB == GL_ZERO);
- (void) ctx;
- (void) n;
- (void) mask;
- (void) src;
- (void) dst;
-}
-
-
-/**
- * Common transparency blending mode:
- * glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA).
- */
-static void _BLENDAPI
-blend_transparency_ubyte(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
- GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
- const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
- GLuint i;
-
- ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].SrcRGB == GL_SRC_ALPHA);
- ASSERT(ctx->Color.Blend[0].SrcA == GL_SRC_ALPHA);
- ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE_MINUS_SRC_ALPHA);
- ASSERT(ctx->Color.Blend[0].DstA == GL_ONE_MINUS_SRC_ALPHA);
- ASSERT(chanType == GL_UNSIGNED_BYTE);
-
- (void) ctx;
-
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- const GLint t = rgba[i][ACOMP]; /* t is in [0, 255] */
- if (t == 0) {
- /* 0% alpha */
- COPY_4UBV(rgba[i], dest[i]);
- }
- else if (t != 255) {
- GLint divtemp;
- const GLint r = DIV255((rgba[i][RCOMP] - dest[i][RCOMP]) * t) + dest[i][RCOMP];
- const GLint g = DIV255((rgba[i][GCOMP] - dest[i][GCOMP]) * t) + dest[i][GCOMP];
- const GLint b = DIV255((rgba[i][BCOMP] - dest[i][BCOMP]) * t) + dest[i][BCOMP];
- const GLint a = DIV255((rgba[i][ACOMP] - dest[i][ACOMP]) * t) + dest[i][ACOMP];
- ASSERT(r <= 255);
- ASSERT(g <= 255);
- ASSERT(b <= 255);
- ASSERT(a <= 255);
- rgba[i][RCOMP] = (GLubyte) r;
- rgba[i][GCOMP] = (GLubyte) g;
- rgba[i][BCOMP] = (GLubyte) b;
- rgba[i][ACOMP] = (GLubyte) a;
- }
- }
- }
-}
-
-
-static void _BLENDAPI
-blend_transparency_ushort(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
- GLushort (*rgba)[4] = (GLushort (*)[4]) src;
- const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
- GLuint i;
-
- ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].SrcRGB == GL_SRC_ALPHA);
- ASSERT(ctx->Color.Blend[0].SrcA == GL_SRC_ALPHA);
- ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE_MINUS_SRC_ALPHA);
- ASSERT(ctx->Color.Blend[0].DstA == GL_ONE_MINUS_SRC_ALPHA);
- ASSERT(chanType == GL_UNSIGNED_SHORT);
-
- (void) ctx;
-
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- const GLint t = rgba[i][ACOMP];
- if (t == 0) {
- /* 0% alpha */
- COPY_4V(rgba[i], dest[i]);
- }
- else if (t != 65535) {
- const GLfloat tt = (GLfloat) t / 65535.0F;
- GLushort r = (GLushort) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]);
- GLushort g = (GLushort) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]);
- GLushort b = (GLushort) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]);
- GLushort a = (GLushort) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]);
- ASSIGN_4V(rgba[i], r, g, b, a);
- }
- }
- }
-}
-
-
-static void _BLENDAPI
-blend_transparency_float(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
- GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
- const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
- GLuint i;
-
- ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].SrcRGB == GL_SRC_ALPHA);
- ASSERT(ctx->Color.Blend[0].SrcA == GL_SRC_ALPHA);
- ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE_MINUS_SRC_ALPHA);
- ASSERT(ctx->Color.Blend[0].DstA == GL_ONE_MINUS_SRC_ALPHA);
- ASSERT(chanType == GL_FLOAT);
-
- (void) ctx;
-
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- const GLfloat t = rgba[i][ACOMP]; /* t in [0, 1] */
- if (t == 0.0F) {
- /* 0% alpha */
- COPY_4V(rgba[i], dest[i]);
- }
- else if (t != 1.0F) {
- GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * t + dest[i][RCOMP];
- GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * t + dest[i][GCOMP];
- GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * t + dest[i][BCOMP];
- GLfloat a = (rgba[i][ACOMP] - dest[i][ACOMP]) * t + dest[i][ACOMP];
- ASSIGN_4V(rgba[i], r, g, b, a);
- }
- }
- }
-}
-
-
-
-/**
- * Add src and dest: glBlendFunc(GL_ONE, GL_ONE).
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_add(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
- GLuint i;
-
- ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
- ASSERT(ctx->Color.Blend[0].SrcRGB == GL_ONE);
- ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE);
- (void) ctx;
-
- if (chanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
- const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLint r = rgba[i][RCOMP] + dest[i][RCOMP];
- GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
- GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
- GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
- rgba[i][RCOMP] = (GLubyte) MIN2( r, 255 );
- rgba[i][GCOMP] = (GLubyte) MIN2( g, 255 );
- rgba[i][BCOMP] = (GLubyte) MIN2( b, 255 );
- rgba[i][ACOMP] = (GLubyte) MIN2( a, 255 );
- }
- }
- }
- else if (chanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = (GLushort (*)[4]) src;
- const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLint r = rgba[i][RCOMP] + dest[i][RCOMP];
- GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
- GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
- GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
- rgba[i][RCOMP] = (GLshort) MIN2( r, 255 );
- rgba[i][GCOMP] = (GLshort) MIN2( g, 255 );
- rgba[i][BCOMP] = (GLshort) MIN2( b, 255 );
- rgba[i][ACOMP] = (GLshort) MIN2( a, 255 );
- }
- }
- }
- else {
- GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
- const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
- ASSERT(chanType == GL_FLOAT);
- for (i=0;i<n;i++) {
- if (mask[i]) {
- /* don't RGB clamp to max */
- rgba[i][RCOMP] += dest[i][RCOMP];
- rgba[i][GCOMP] += dest[i][GCOMP];
- rgba[i][BCOMP] += dest[i][BCOMP];
- rgba[i][ACOMP] += dest[i][ACOMP];
- }
- }
- }
-}
-
-
-
-/**
- * Blend min function.
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_min(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
- GLuint i;
- ASSERT(ctx->Color.Blend[0].EquationRGB == GL_MIN);
- ASSERT(ctx->Color.Blend[0].EquationA == GL_MIN);
- (void) ctx;
-
- if (chanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
- const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
- rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
- }
- }
- }
- else if (chanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = (GLushort (*)[4]) src;
- const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
- rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
- }
- }
- }
- else {
- GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
- const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
- ASSERT(chanType == GL_FLOAT);
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
- rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
- }
- }
- }
-}
-
-
-/**
- * Blend max function.
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_max(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
- GLuint i;
- ASSERT(ctx->Color.Blend[0].EquationRGB == GL_MAX);
- ASSERT(ctx->Color.Blend[0].EquationA == GL_MAX);
- (void) ctx;
-
- if (chanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
- const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
- rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
- }
- }
- }
- else if (chanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = (GLushort (*)[4]) src;
- const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
- rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
- }
- }
- }
- else {
- GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
- const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
- ASSERT(chanType == GL_FLOAT);
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
- rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
- }
- }
- }
-}
-
-
-
-/**
- * Modulate: result = src * dest
- * Any chanType ok.
- */
-static void _BLENDAPI
-blend_modulate(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLvoid *src, const GLvoid *dst, GLenum chanType)
-{
- GLuint i;
- (void) ctx;
-
- if (chanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
- const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLint divtemp;
- rgba[i][RCOMP] = DIV255(rgba[i][RCOMP] * dest[i][RCOMP]);
- rgba[i][GCOMP] = DIV255(rgba[i][GCOMP] * dest[i][GCOMP]);
- rgba[i][BCOMP] = DIV255(rgba[i][BCOMP] * dest[i][BCOMP]);
- rgba[i][ACOMP] = DIV255(rgba[i][ACOMP] * dest[i][ACOMP]);
- }
- }
- }
- else if (chanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = (GLushort (*)[4]) src;
- const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16;
- rgba[i][GCOMP] = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16;
- rgba[i][BCOMP] = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16;
- rgba[i][ACOMP] = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16;
- }
- }
- }
- else {
- GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
- const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
- ASSERT(chanType == GL_FLOAT);
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = rgba[i][RCOMP] * dest[i][RCOMP];
- rgba[i][GCOMP] = rgba[i][GCOMP] * dest[i][GCOMP];
- rgba[i][BCOMP] = rgba[i][BCOMP] * dest[i][BCOMP];
- rgba[i][ACOMP] = rgba[i][ACOMP] * dest[i][ACOMP];
- }
- }
- }
-}
-
-
-/**
- * Do any blending operation, using floating point.
- * \param n number of pixels
- * \param mask fragment writemask array
- * \param rgba array of incoming (and modified) pixels
- * \param dest array of pixels from the dest color buffer
- */
-static void
-blend_general_float(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- GLfloat rgba[][4], GLfloat dest[][4],
- GLenum chanType)
-{
- GLuint i;
-
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- /* Incoming/source Color */
- const GLfloat Rs = rgba[i][RCOMP];
- const GLfloat Gs = rgba[i][GCOMP];
- const GLfloat Bs = rgba[i][BCOMP];
- const GLfloat As = rgba[i][ACOMP];
-
- /* Frame buffer/dest color */
- const GLfloat Rd = dest[i][RCOMP];
- const GLfloat Gd = dest[i][GCOMP];
- const GLfloat Bd = dest[i][BCOMP];
- const GLfloat Ad = dest[i][ACOMP];
-
- GLfloat sR, sG, sB, sA; /* Source factor */
- GLfloat dR, dG, dB, dA; /* Dest factor */
- GLfloat r, g, b, a; /* result color */
-
- /* XXX for the case of constant blend terms we could init
- * the sX and dX variables just once before the loop.
- */
-
- /* Source RGB factor */
- switch (ctx->Color.Blend[0].SrcRGB) {
- case GL_ZERO:
- sR = sG = sB = 0.0F;
- break;
- case GL_ONE:
- sR = sG = sB = 1.0F;
- break;
- case GL_DST_COLOR:
- sR = Rd;
- sG = Gd;
- sB = Bd;
- break;
- case GL_ONE_MINUS_DST_COLOR:
- sR = 1.0F - Rd;
- sG = 1.0F - Gd;
- sB = 1.0F - Bd;
- break;
- case GL_SRC_ALPHA:
- sR = sG = sB = As;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- sR = sG = sB = 1.0F - As;
- break;
- case GL_DST_ALPHA:
- sR = sG = sB = Ad;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- sR = sG = sB = 1.0F - Ad;
- break;
- case GL_SRC_ALPHA_SATURATE:
- if (As < 1.0F - Ad) {
- sR = sG = sB = As;
- }
- else {
- sR = sG = sB = 1.0F - Ad;
- }
- break;
- case GL_CONSTANT_COLOR:
- sR = ctx->Color.BlendColor[0];
- sG = ctx->Color.BlendColor[1];
- sB = ctx->Color.BlendColor[2];
- break;
- case GL_ONE_MINUS_CONSTANT_COLOR:
- sR = 1.0F - ctx->Color.BlendColor[0];
- sG = 1.0F - ctx->Color.BlendColor[1];
- sB = 1.0F - ctx->Color.BlendColor[2];
- break;
- case GL_CONSTANT_ALPHA:
- sR = sG = sB = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- sR = sG = sB = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_SRC_COLOR:
- sR = Rs;
- sG = Gs;
- sB = Bs;
- break;
- case GL_ONE_MINUS_SRC_COLOR:
- sR = 1.0F - Rs;
- sG = 1.0F - Gs;
- sB = 1.0F - Bs;
- break;
- default:
- /* this should never happen */
- _mesa_problem(ctx, "Bad blend source RGB factor in blend_general_float");
- return;
- }
-
- /* Source Alpha factor */
- switch (ctx->Color.Blend[0].SrcA) {
- case GL_ZERO:
- sA = 0.0F;
- break;
- case GL_ONE:
- sA = 1.0F;
- break;
- case GL_DST_COLOR:
- sA = Ad;
- break;
- case GL_ONE_MINUS_DST_COLOR:
- sA = 1.0F - Ad;
- break;
- case GL_SRC_ALPHA:
- sA = As;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- sA = 1.0F - As;
- break;
- case GL_DST_ALPHA:
- sA = Ad;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- sA = 1.0F - Ad;
- break;
- case GL_SRC_ALPHA_SATURATE:
- sA = 1.0;
- break;
- case GL_CONSTANT_COLOR:
- sA = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_COLOR:
- sA = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_CONSTANT_ALPHA:
- sA = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- sA = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_SRC_COLOR:
- sA = As;
- break;
- case GL_ONE_MINUS_SRC_COLOR:
- sA = 1.0F - As;
- break;
- default:
- /* this should never happen */
- sA = 0.0F;
- _mesa_problem(ctx, "Bad blend source A factor in blend_general_float");
- return;
- }
-
- /* Dest RGB factor */
- switch (ctx->Color.Blend[0].DstRGB) {
- case GL_ZERO:
- dR = dG = dB = 0.0F;
- break;
- case GL_ONE:
- dR = dG = dB = 1.0F;
- break;
- case GL_SRC_COLOR:
- dR = Rs;
- dG = Gs;
- dB = Bs;
- break;
- case GL_ONE_MINUS_SRC_COLOR:
- dR = 1.0F - Rs;
- dG = 1.0F - Gs;
- dB = 1.0F - Bs;
- break;
- case GL_SRC_ALPHA:
- dR = dG = dB = As;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- dR = dG = dB = 1.0F - As;
- break;
- case GL_DST_ALPHA:
- dR = dG = dB = Ad;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- dR = dG = dB = 1.0F - Ad;
- break;
- case GL_CONSTANT_COLOR:
- dR = ctx->Color.BlendColor[0];
- dG = ctx->Color.BlendColor[1];
- dB = ctx->Color.BlendColor[2];
- break;
- case GL_ONE_MINUS_CONSTANT_COLOR:
- dR = 1.0F - ctx->Color.BlendColor[0];
- dG = 1.0F - ctx->Color.BlendColor[1];
- dB = 1.0F - ctx->Color.BlendColor[2];
- break;
- case GL_CONSTANT_ALPHA:
- dR = dG = dB = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- dR = dG = dB = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_DST_COLOR:
- dR = Rd;
- dG = Gd;
- dB = Bd;
- break;
- case GL_ONE_MINUS_DST_COLOR:
- dR = 1.0F - Rd;
- dG = 1.0F - Gd;
- dB = 1.0F - Bd;
- break;
- default:
- /* this should never happen */
- dR = dG = dB = 0.0F;
- _mesa_problem(ctx, "Bad blend dest RGB factor in blend_general_float");
- return;
- }
-
- /* Dest Alpha factor */
- switch (ctx->Color.Blend[0].DstA) {
- case GL_ZERO:
- dA = 0.0F;
- break;
- case GL_ONE:
- dA = 1.0F;
- break;
- case GL_SRC_COLOR:
- dA = As;
- break;
- case GL_ONE_MINUS_SRC_COLOR:
- dA = 1.0F - As;
- break;
- case GL_SRC_ALPHA:
- dA = As;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- dA = 1.0F - As;
- break;
- case GL_DST_ALPHA:
- dA = Ad;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- dA = 1.0F - Ad;
- break;
- case GL_CONSTANT_COLOR:
- dA = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_COLOR:
- dA = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_CONSTANT_ALPHA:
- dA = ctx->Color.BlendColor[3];
- break;
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- dA = 1.0F - ctx->Color.BlendColor[3];
- break;
- case GL_DST_COLOR:
- dA = Ad;
- break;
- case GL_ONE_MINUS_DST_COLOR:
- dA = 1.0F - Ad;
- break;
- default:
- /* this should never happen */
- dA = 0.0F;
- _mesa_problem(ctx, "Bad blend dest A factor in blend_general_float");
- return;
- }
-
- /* compute the blended RGB */
- switch (ctx->Color.Blend[0].EquationRGB) {
- case GL_FUNC_ADD:
- r = Rs * sR + Rd * dR;
- g = Gs * sG + Gd * dG;
- b = Bs * sB + Bd * dB;
- a = As * sA + Ad * dA;
- break;
- case GL_FUNC_SUBTRACT:
- r = Rs * sR - Rd * dR;
- g = Gs * sG - Gd * dG;
- b = Bs * sB - Bd * dB;
- a = As * sA - Ad * dA;
- break;
- case GL_FUNC_REVERSE_SUBTRACT:
- r = Rd * dR - Rs * sR;
- g = Gd * dG - Gs * sG;
- b = Bd * dB - Bs * sB;
- a = Ad * dA - As * sA;
- break;
- case GL_MIN:
- r = MIN2( Rd, Rs );
- g = MIN2( Gd, Gs );
- b = MIN2( Bd, Bs );
- break;
- case GL_MAX:
- r = MAX2( Rd, Rs );
- g = MAX2( Gd, Gs );
- b = MAX2( Bd, Bs );
- break;
- default:
- /* should never get here */
- r = g = b = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- return;
- }
-
- /* compute the blended alpha */
- switch (ctx->Color.Blend[0].EquationA) {
- case GL_FUNC_ADD:
- a = As * sA + Ad * dA;
- break;
- case GL_FUNC_SUBTRACT:
- a = As * sA - Ad * dA;
- break;
- case GL_FUNC_REVERSE_SUBTRACT:
- a = Ad * dA - As * sA;
- break;
- case GL_MIN:
- a = MIN2( Ad, As );
- break;
- case GL_MAX:
- a = MAX2( Ad, As );
- break;
- default:
- /* should never get here */
- a = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- return;
- }
-
- /* final clamping */
-#if 0
- rgba[i][RCOMP] = MAX2( r, 0.0F );
- rgba[i][GCOMP] = MAX2( g, 0.0F );
- rgba[i][BCOMP] = MAX2( b, 0.0F );
- rgba[i][ACOMP] = CLAMP( a, 0.0F, 1.0F );
-#else
- ASSIGN_4V(rgba[i], r, g, b, a);
-#endif
- }
- }
-}
-
-
-/**
- * Do any blending operation, any chanType.
- */
-static void
-blend_general(struct gl_context *ctx, GLuint n, const GLubyte mask[],
- void *src, const void *dst, GLenum chanType)
-{
- GLfloat (*rgbaF)[4], (*destF)[4];
-
- rgbaF = (GLfloat (*)[4]) malloc(4 * n * sizeof(GLfloat));
- destF = (GLfloat (*)[4]) malloc(4 * n * sizeof(GLfloat));
- if (!rgbaF || !destF) {
- free(rgbaF);
- free(destF);
- _mesa_error(ctx, GL_OUT_OF_MEMORY, "blending");
- return;
- }
-
- if (chanType == GL_UNSIGNED_BYTE) {
- GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
- const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
- GLuint i;
- /* convert ubytes to floats */
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- rgbaF[i][RCOMP] = UBYTE_TO_FLOAT(rgba[i][RCOMP]);
- rgbaF[i][GCOMP] = UBYTE_TO_FLOAT(rgba[i][GCOMP]);
- rgbaF[i][BCOMP] = UBYTE_TO_FLOAT(rgba[i][BCOMP]);
- rgbaF[i][ACOMP] = UBYTE_TO_FLOAT(rgba[i][ACOMP]);
- destF[i][RCOMP] = UBYTE_TO_FLOAT(dest[i][RCOMP]);
- destF[i][GCOMP] = UBYTE_TO_FLOAT(dest[i][GCOMP]);
- destF[i][BCOMP] = UBYTE_TO_FLOAT(dest[i][BCOMP]);
- destF[i][ACOMP] = UBYTE_TO_FLOAT(dest[i][ACOMP]);
- }
- }
- /* do blend */
- blend_general_float(ctx, n, mask, rgbaF, destF, chanType);
- /* convert back to ubytes */
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][RCOMP], rgbaF[i][RCOMP]);
- UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][GCOMP], rgbaF[i][GCOMP]);
- UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][BCOMP], rgbaF[i][BCOMP]);
- UNCLAMPED_FLOAT_TO_UBYTE(rgba[i][ACOMP], rgbaF[i][ACOMP]);
- }
- }
- }
- else if (chanType == GL_UNSIGNED_SHORT) {
- GLushort (*rgba)[4] = (GLushort (*)[4]) src;
- const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
- GLuint i;
- /* convert ushorts to floats */
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- rgbaF[i][RCOMP] = USHORT_TO_FLOAT(rgba[i][RCOMP]);
- rgbaF[i][GCOMP] = USHORT_TO_FLOAT(rgba[i][GCOMP]);
- rgbaF[i][BCOMP] = USHORT_TO_FLOAT(rgba[i][BCOMP]);
- rgbaF[i][ACOMP] = USHORT_TO_FLOAT(rgba[i][ACOMP]);
- destF[i][RCOMP] = USHORT_TO_FLOAT(dest[i][RCOMP]);
- destF[i][GCOMP] = USHORT_TO_FLOAT(dest[i][GCOMP]);
- destF[i][BCOMP] = USHORT_TO_FLOAT(dest[i][BCOMP]);
- destF[i][ACOMP] = USHORT_TO_FLOAT(dest[i][ACOMP]);
- }
- }
- /* do blend */
- blend_general_float(ctx, n, mask, rgbaF, destF, chanType);
- /* convert back to ushorts */
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- UNCLAMPED_FLOAT_TO_USHORT(rgba[i][RCOMP], rgbaF[i][RCOMP]);
- UNCLAMPED_FLOAT_TO_USHORT(rgba[i][GCOMP], rgbaF[i][GCOMP]);
- UNCLAMPED_FLOAT_TO_USHORT(rgba[i][BCOMP], rgbaF[i][BCOMP]);
- UNCLAMPED_FLOAT_TO_USHORT(rgba[i][ACOMP], rgbaF[i][ACOMP]);
- }
- }
- }
- else {
- blend_general_float(ctx, n, mask, (GLfloat (*)[4]) src,
- (GLfloat (*)[4]) dst, chanType);
- }
-
- free(rgbaF);
- free(destF);
-}
-
-
-
-/**
- * Analyze current blending parameters to pick fastest blending function.
- * Result: the ctx->Color.BlendFunc pointer is updated.
- */
-void
-_swrast_choose_blend_func(struct gl_context *ctx, GLenum chanType)
-{
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
- const GLenum eq = ctx->Color.Blend[0].EquationRGB;
- const GLenum srcRGB = ctx->Color.Blend[0].SrcRGB;
- const GLenum dstRGB = ctx->Color.Blend[0].DstRGB;
- const GLenum srcA = ctx->Color.Blend[0].SrcA;
- const GLenum dstA = ctx->Color.Blend[0].DstA;
-
- if (ctx->Color.Blend[0].EquationRGB != ctx->Color.Blend[0].EquationA) {
- swrast->BlendFunc = blend_general;
- }
- else if (eq == GL_MIN) {
- /* Note: GL_MIN ignores the blending weight factors */
-#if defined(USE_MMX_ASM)
- if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
- swrast->BlendFunc = _mesa_mmx_blend_min;
- }
- else
-#endif
- swrast->BlendFunc = blend_min;
- }
- else if (eq == GL_MAX) {
- /* Note: GL_MAX ignores the blending weight factors */
-#if defined(USE_MMX_ASM)
- if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
- swrast->BlendFunc = _mesa_mmx_blend_max;
- }
- else
-#endif
- swrast->BlendFunc = blend_max;
- }
- else if (srcRGB != srcA || dstRGB != dstA) {
- swrast->BlendFunc = blend_general;
- }
- else if (eq == GL_FUNC_ADD && srcRGB == GL_SRC_ALPHA
- && dstRGB == GL_ONE_MINUS_SRC_ALPHA) {
-#if defined(USE_MMX_ASM)
- if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
- swrast->BlendFunc = _mesa_mmx_blend_transparency;
- }
- else
-#endif
- {
- if (chanType == GL_UNSIGNED_BYTE)
- swrast->BlendFunc = blend_transparency_ubyte;
- else if (chanType == GL_UNSIGNED_SHORT)
- swrast->BlendFunc = blend_transparency_ushort;
- else
- swrast->BlendFunc = blend_transparency_float;
- }
- }
- else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ONE) {
-#if defined(USE_MMX_ASM)
- if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
- swrast->BlendFunc = _mesa_mmx_blend_add;
- }
- else
-#endif
- swrast->BlendFunc = blend_add;
- }
- else if (((eq == GL_FUNC_ADD || eq == GL_FUNC_REVERSE_SUBTRACT)
- && (srcRGB == GL_ZERO && dstRGB == GL_SRC_COLOR))
- ||
- ((eq == GL_FUNC_ADD || eq == GL_FUNC_SUBTRACT)
- && (srcRGB == GL_DST_COLOR && dstRGB == GL_ZERO))) {
-#if defined(USE_MMX_ASM)
- if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
- swrast->BlendFunc = _mesa_mmx_blend_modulate;
- }
- else
-#endif
- swrast->BlendFunc = blend_modulate;
- }
- else if (eq == GL_FUNC_ADD && srcRGB == GL_ZERO && dstRGB == GL_ONE) {
- swrast->BlendFunc = blend_noop;
- }
- else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ZERO) {
- swrast->BlendFunc = blend_replace;
- }
- else {
- swrast->BlendFunc = blend_general;
- }
-}
-
-
-
-/**
- * Apply the blending operator to a span of pixels.
- * We can handle horizontal runs of pixels (spans) or arrays of x/y
- * pixel coordinates.
- */
-void
-_swrast_blend_span(struct gl_context *ctx, struct gl_renderbuffer *rb, SWspan *span)
-{
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
- void *rbPixels;
-
- ASSERT(span->end <= MAX_WIDTH);
- ASSERT(span->arrayMask & SPAN_RGBA);
- ASSERT(rb->DataType == span->array->ChanType);
- ASSERT(!ctx->Color._LogicOpEnabled);
-
- rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
-
- swrast->BlendFunc(ctx, span->end, span->array->mask,
- span->array->rgba, rbPixels, span->array->ChanType);
-}
+/*
+ * Mesa 3-D graphics library
+ * Version: 7.1
+ *
+ * Copyright (C) 1999-2008 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.
+ */
+
+
+/**
+ * \file swrast/s_blend.c
+ * \brief software blending.
+ * \author Brian Paul
+ *
+ * Only a few blend modes have been optimized (min, max, transparency, add)
+ * more optimized cases can easily be added if needed.
+ * Celestia uses glBlendFunc(GL_SRC_ALPHA, GL_ONE), for example.
+ */
+
+
+
+#include "main/glheader.h"
+#include "main/context.h"
+#include "main/colormac.h"
+#include "main/macros.h"
+
+#include "s_blend.h"
+#include "s_context.h"
+#include "s_span.h"
+
+
+#if defined(USE_MMX_ASM)
+#include "x86/mmx.h"
+#include "x86/common_x86_asm.h"
+#define _BLENDAPI _ASMAPI
+#else
+#define _BLENDAPI
+#endif
+
+
+/**
+ * Integer divide by 255
+ * Declare "int divtemp" before using.
+ * This satisfies Glean and should be reasonably fast.
+ * Contributed by Nathan Hand.
+ */
+#define DIV255(X) (divtemp = (X), ((divtemp << 8) + divtemp + 256) >> 16)
+
+
+
+/**
+ * Special case for glBlendFunc(GL_ZERO, GL_ONE).
+ * No-op means the framebuffer values remain unchanged.
+ * Any chanType ok.
+ */
+static void _BLENDAPI
+blend_noop(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
+{
+ GLint bytes;
+
+ ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].SrcRGB == GL_ZERO);
+ ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE);
+ (void) ctx;
+
+ /* just memcpy */
+ if (chanType == GL_UNSIGNED_BYTE)
+ bytes = 4 * n * sizeof(GLubyte);
+ else if (chanType == GL_UNSIGNED_SHORT)
+ bytes = 4 * n * sizeof(GLushort);
+ else
+ bytes = 4 * n * sizeof(GLfloat);
+
+ memcpy(src, dst, bytes);
+}
+
+
+/**
+ * Special case for glBlendFunc(GL_ONE, GL_ZERO)
+ * Any chanType ok.
+ */
+static void _BLENDAPI
+blend_replace(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
+{
+ ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].SrcRGB == GL_ONE);
+ ASSERT(ctx->Color.Blend[0].DstRGB == GL_ZERO);
+ (void) ctx;
+ (void) n;
+ (void) mask;
+ (void) src;
+ (void) dst;
+}
+
+
+/**
+ * Common transparency blending mode:
+ * glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA).
+ */
+static void _BLENDAPI
+blend_transparency_ubyte(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
+{
+ GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
+ const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
+ GLuint i;
+
+ ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].SrcRGB == GL_SRC_ALPHA);
+ ASSERT(ctx->Color.Blend[0].SrcA == GL_SRC_ALPHA);
+ ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE_MINUS_SRC_ALPHA);
+ ASSERT(ctx->Color.Blend[0].DstA == GL_ONE_MINUS_SRC_ALPHA);
+ ASSERT(chanType == GL_UNSIGNED_BYTE);
+
+ (void) ctx;
+
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ const GLint t = rgba[i][ACOMP]; /* t is in [0, 255] */
+ if (t == 0) {
+ /* 0% alpha */
+ COPY_4UBV(rgba[i], dest[i]);
+ }
+ else if (t != 255) {
+ GLint divtemp;
+ const GLint r = DIV255((rgba[i][RCOMP] - dest[i][RCOMP]) * t) + dest[i][RCOMP];
+ const GLint g = DIV255((rgba[i][GCOMP] - dest[i][GCOMP]) * t) + dest[i][GCOMP];
+ const GLint b = DIV255((rgba[i][BCOMP] - dest[i][BCOMP]) * t) + dest[i][BCOMP];
+ const GLint a = DIV255((rgba[i][ACOMP] - dest[i][ACOMP]) * t) + dest[i][ACOMP];
+ ASSERT(r <= 255);
+ ASSERT(g <= 255);
+ ASSERT(b <= 255);
+ ASSERT(a <= 255);
+ rgba[i][RCOMP] = (GLubyte) r;
+ rgba[i][GCOMP] = (GLubyte) g;
+ rgba[i][BCOMP] = (GLubyte) b;
+ rgba[i][ACOMP] = (GLubyte) a;
+ }
+ }
+ }
+}
+
+
+static void _BLENDAPI
+blend_transparency_ushort(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
+{
+ GLushort (*rgba)[4] = (GLushort (*)[4]) src;
+ const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
+ GLuint i;
+
+ ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].SrcRGB == GL_SRC_ALPHA);
+ ASSERT(ctx->Color.Blend[0].SrcA == GL_SRC_ALPHA);
+ ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE_MINUS_SRC_ALPHA);
+ ASSERT(ctx->Color.Blend[0].DstA == GL_ONE_MINUS_SRC_ALPHA);
+ ASSERT(chanType == GL_UNSIGNED_SHORT);
+
+ (void) ctx;
+
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ const GLint t = rgba[i][ACOMP];
+ if (t == 0) {
+ /* 0% alpha */
+ COPY_4V(rgba[i], dest[i]);
+ }
+ else if (t != 65535) {
+ const GLfloat tt = (GLfloat) t / 65535.0F;
+ GLushort r = (GLushort) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]);
+ GLushort g = (GLushort) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]);
+ GLushort b = (GLushort) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]);
+ GLushort a = (GLushort) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]);
+ ASSIGN_4V(rgba[i], r, g, b, a);
+ }
+ }
+ }
+}
+
+
+static void _BLENDAPI
+blend_transparency_float(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
+{
+ GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
+ const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
+ GLuint i;
+
+ ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].SrcRGB == GL_SRC_ALPHA);
+ ASSERT(ctx->Color.Blend[0].SrcA == GL_SRC_ALPHA);
+ ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE_MINUS_SRC_ALPHA);
+ ASSERT(ctx->Color.Blend[0].DstA == GL_ONE_MINUS_SRC_ALPHA);
+ ASSERT(chanType == GL_FLOAT);
+
+ (void) ctx;
+
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ const GLfloat t = rgba[i][ACOMP]; /* t in [0, 1] */
+ if (t == 0.0F) {
+ /* 0% alpha */
+ COPY_4V(rgba[i], dest[i]);
+ }
+ else if (t != 1.0F) {
+ GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * t + dest[i][RCOMP];
+ GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * t + dest[i][GCOMP];
+ GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * t + dest[i][BCOMP];
+ GLfloat a = (rgba[i][ACOMP] - dest[i][ACOMP]) * t + dest[i][ACOMP];
+ ASSIGN_4V(rgba[i], r, g, b, a);
+ }
+ }
+ }
+}
+
+
+
+/**
+ * Add src and dest: glBlendFunc(GL_ONE, GL_ONE).
+ * Any chanType ok.
+ */
+static void _BLENDAPI
+blend_add(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
+{
+ GLuint i;
+
+ ASSERT(ctx->Color.Blend[0].EquationRGB == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].EquationA == GL_FUNC_ADD);
+ ASSERT(ctx->Color.Blend[0].SrcRGB == GL_ONE);
+ ASSERT(ctx->Color.Blend[0].DstRGB == GL_ONE);
+ (void) ctx;
+
+ if (chanType == GL_UNSIGNED_BYTE) {
+ GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
+ const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ GLint r = rgba[i][RCOMP] + dest[i][RCOMP];
+ GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
+ GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
+ GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
+ rgba[i][RCOMP] = (GLubyte) MIN2( r, 255 );
+ rgba[i][GCOMP] = (GLubyte) MIN2( g, 255 );
+ rgba[i][BCOMP] = (GLubyte) MIN2( b, 255 );
+ rgba[i][ACOMP] = (GLubyte) MIN2( a, 255 );
+ }
+ }
+ }
+ else if (chanType == GL_UNSIGNED_SHORT) {
+ GLushort (*rgba)[4] = (GLushort (*)[4]) src;
+ const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ GLint r = rgba[i][RCOMP] + dest[i][RCOMP];
+ GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
+ GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
+ GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
+ rgba[i][RCOMP] = (GLshort) MIN2( r, 255 );
+ rgba[i][GCOMP] = (GLshort) MIN2( g, 255 );
+ rgba[i][BCOMP] = (GLshort) MIN2( b, 255 );
+ rgba[i][ACOMP] = (GLshort) MIN2( a, 255 );
+ }
+ }
+ }
+ else {
+ GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
+ const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
+ ASSERT(chanType == GL_FLOAT);
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ /* don't RGB clamp to max */
+ rgba[i][RCOMP] += dest[i][RCOMP];
+ rgba[i][GCOMP] += dest[i][GCOMP];
+ rgba[i][BCOMP] += dest[i][BCOMP];
+ rgba[i][ACOMP] += dest[i][ACOMP];
+ }
+ }
+ }
+}
+
+
+
+/**
+ * Blend min function.
+ * Any chanType ok.
+ */
+static void _BLENDAPI
+blend_min(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
+{
+ GLuint i;
+ ASSERT(ctx->Color.Blend[0].EquationRGB == GL_MIN);
+ ASSERT(ctx->Color.Blend[0].EquationA == GL_MIN);
+ (void) ctx;
+
+ if (chanType == GL_UNSIGNED_BYTE) {
+ GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
+ const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
+ rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
+ rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
+ rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
+ }
+ }
+ }
+ else if (chanType == GL_UNSIGNED_SHORT) {
+ GLushort (*rgba)[4] = (GLushort (*)[4]) src;
+ const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
+ rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
+ rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
+ rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
+ }
+ }
+ }
+ else {
+ GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
+ const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
+ ASSERT(chanType == GL_FLOAT);
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ rgba[i][RCOMP] = MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
+ rgba[i][GCOMP] = MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
+ rgba[i][BCOMP] = MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
+ rgba[i][ACOMP] = MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
+ }
+ }
+ }
+}
+
+
+/**
+ * Blend max function.
+ * Any chanType ok.
+ */
+static void _BLENDAPI
+blend_max(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
+{
+ GLuint i;
+ ASSERT(ctx->Color.Blend[0].EquationRGB == GL_MAX);
+ ASSERT(ctx->Color.Blend[0].EquationA == GL_MAX);
+ (void) ctx;
+
+ if (chanType == GL_UNSIGNED_BYTE) {
+ GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
+ const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
+ rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
+ rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
+ rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
+ }
+ }
+ }
+ else if (chanType == GL_UNSIGNED_SHORT) {
+ GLushort (*rgba)[4] = (GLushort (*)[4]) src;
+ const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
+ rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
+ rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
+ rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
+ }
+ }
+ }
+ else {
+ GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
+ const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
+ ASSERT(chanType == GL_FLOAT);
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ rgba[i][RCOMP] = MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
+ rgba[i][GCOMP] = MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
+ rgba[i][BCOMP] = MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
+ rgba[i][ACOMP] = MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
+ }
+ }
+ }
+}
+
+
+
+/**
+ * Modulate: result = src * dest
+ * Any chanType ok.
+ */
+static void _BLENDAPI
+blend_modulate(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
+{
+ GLuint i;
+ (void) ctx;
+
+ if (chanType == GL_UNSIGNED_BYTE) {
+ GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
+ const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ GLint divtemp;
+ rgba[i][RCOMP] = DIV255(rgba[i][RCOMP] * dest[i][RCOMP]);
+ rgba[i][GCOMP] = DIV255(rgba[i][GCOMP] * dest[i][GCOMP]);
+ rgba[i][BCOMP] = DIV255(rgba[i][BCOMP] * dest[i][BCOMP]);
+ rgba[i][ACOMP] = DIV255(rgba[i][ACOMP] * dest[i][ACOMP]);
+ }
+ }
+ }
+ else if (chanType == GL_UNSIGNED_SHORT) {
+ GLushort (*rgba)[4] = (GLushort (*)[4]) src;
+ const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ rgba[i][RCOMP] = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16;
+ rgba[i][GCOMP] = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16;
+ rgba[i][BCOMP] = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16;
+ rgba[i][ACOMP] = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16;
+ }
+ }
+ }
+ else {
+ GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
+ const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
+ ASSERT(chanType == GL_FLOAT);
+ for (i=0;i<n;i++) {
+ if (mask[i]) {
+ rgba[i][RCOMP] = rgba[i][RCOMP] * dest[i][RCOMP];
+ rgba[i][GCOMP] = rgba[i][GCOMP] * dest[i][GCOMP];
+ rgba[i][BCOMP] = rgba[i][BCOMP] * dest[i][BCOMP];
+ rgba[i][ACOMP] = rgba[i][ACOMP] * dest[i][ACOMP];
+ }
+ }
+ }
+}
+
+
+/**
+ * Do any blending operation, using floating point.
+ * \param n number of pixels
+ * \param mask fragment writemask array
+ * \param rgba array of incoming (and modified) pixels
+ * \param dest array of pixels from the dest color buffer
+ */
+static void
+blend_general_float(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLfloat rgba[][4], GLfloat dest[][4],
+ GLenum chanType)
+{
+ GLuint i;
+
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ /* Incoming/source Color */
+ const GLfloat Rs = rgba[i][RCOMP];
+ const GLfloat Gs = rgba[i][GCOMP];
+ const GLfloat Bs = rgba[i][BCOMP];
+ const GLfloat As = rgba[i][ACOMP];
+
+ /* Frame buffer/dest color */
+ const GLfloat Rd = dest[i][RCOMP];
+ const GLfloat Gd = dest[i][GCOMP];
+ const GLfloat Bd = dest[i][BCOMP];
+ const GLfloat Ad = dest[i][ACOMP];
+
+ GLfloat sR, sG, sB, sA; /* Source factor */
+ GLfloat dR, dG, dB, dA; /* Dest factor */
+ GLfloat r, g, b, a; /* result color */
+
+ /* XXX for the case of constant blend terms we could init
+ * the sX and dX variables just once before the loop.
+ */
+
+ /* Source RGB factor */
+ switch (ctx->Color.Blend[0].SrcRGB) {
+ case GL_ZERO:
+ sR = sG = sB = 0.0F;
+ break;
+ case GL_ONE:
+ sR = sG = sB = 1.0F;
+ break;
+ case GL_DST_COLOR:
+ sR = Rd;
+ sG = Gd;
+ sB = Bd;
+ break;
+ case GL_ONE_MINUS_DST_COLOR:
+ sR = 1.0F - Rd;
+ sG = 1.0F - Gd;
+ sB = 1.0F - Bd;
+ break;
+ case GL_SRC_ALPHA:
+ sR = sG = sB = As;
+ break;
+ case GL_ONE_MINUS_SRC_ALPHA:
+ sR = sG = sB = 1.0F - As;
+ break;
+ case GL_DST_ALPHA:
+ sR = sG = sB = Ad;
+ break;
+ case GL_ONE_MINUS_DST_ALPHA:
+ sR = sG = sB = 1.0F - Ad;
+ break;
+ case GL_SRC_ALPHA_SATURATE:
+ if (As < 1.0F - Ad) {
+ sR = sG = sB = As;
+ }
+ else {
+ sR = sG = sB = 1.0F - Ad;
+ }
+ break;
+ case GL_CONSTANT_COLOR:
+ sR = ctx->Color.BlendColor[0];
+ sG = ctx->Color.BlendColor[1];
+ sB = ctx->Color.BlendColor[2];
+ break;
+ case GL_ONE_MINUS_CONSTANT_COLOR:
+ sR = 1.0F - ctx->Color.BlendColor[0];
+ sG = 1.0F - ctx->Color.BlendColor[1];
+ sB = 1.0F - ctx->Color.BlendColor[2];
+ break;
+ case GL_CONSTANT_ALPHA:
+ sR = sG = sB = ctx->Color.BlendColor[3];
+ break;
+ case GL_ONE_MINUS_CONSTANT_ALPHA:
+ sR = sG = sB = 1.0F - ctx->Color.BlendColor[3];
+ break;
+ case GL_SRC_COLOR:
+ sR = Rs;
+ sG = Gs;
+ sB = Bs;
+ break;
+ case GL_ONE_MINUS_SRC_COLOR:
+ sR = 1.0F - Rs;
+ sG = 1.0F - Gs;
+ sB = 1.0F - Bs;
+ break;
+ default:
+ /* this should never happen */
+ _mesa_problem(ctx, "Bad blend source RGB factor in blend_general_float");
+ return;
+ }
+
+ /* Source Alpha factor */
+ switch (ctx->Color.Blend[0].SrcA) {
+ case GL_ZERO:
+ sA = 0.0F;
+ break;
+ case GL_ONE:
+ sA = 1.0F;
+ break;
+ case GL_DST_COLOR:
+ sA = Ad;
+ break;
+ case GL_ONE_MINUS_DST_COLOR:
+ sA = 1.0F - Ad;
+ break;
+ case GL_SRC_ALPHA:
+ sA = As;
+ break;
+ case GL_ONE_MINUS_SRC_ALPHA:
+ sA = 1.0F - As;
+ break;
+ case GL_DST_ALPHA:
+ sA = Ad;
+ break;
+ case GL_ONE_MINUS_DST_ALPHA:
+ sA = 1.0F - Ad;
+ break;
+ case GL_SRC_ALPHA_SATURATE:
+ sA = 1.0;
+ break;
+ case GL_CONSTANT_COLOR:
+ sA = ctx->Color.BlendColor[3];
+ break;
+ case GL_ONE_MINUS_CONSTANT_COLOR:
+ sA = 1.0F - ctx->Color.BlendColor[3];
+ break;
+ case GL_CONSTANT_ALPHA:
+ sA = ctx->Color.BlendColor[3];
+ break;
+ case GL_ONE_MINUS_CONSTANT_ALPHA:
+ sA = 1.0F - ctx->Color.BlendColor[3];
+ break;
+ case GL_SRC_COLOR:
+ sA = As;
+ break;
+ case GL_ONE_MINUS_SRC_COLOR:
+ sA = 1.0F - As;
+ break;
+ default:
+ /* this should never happen */
+ sA = 0.0F;
+ _mesa_problem(ctx, "Bad blend source A factor in blend_general_float");
+ return;
+ }
+
+ /* Dest RGB factor */
+ switch (ctx->Color.Blend[0].DstRGB) {
+ case GL_ZERO:
+ dR = dG = dB = 0.0F;
+ break;
+ case GL_ONE:
+ dR = dG = dB = 1.0F;
+ break;
+ case GL_SRC_COLOR:
+ dR = Rs;
+ dG = Gs;
+ dB = Bs;
+ break;
+ case GL_ONE_MINUS_SRC_COLOR:
+ dR = 1.0F - Rs;
+ dG = 1.0F - Gs;
+ dB = 1.0F - Bs;
+ break;
+ case GL_SRC_ALPHA:
+ dR = dG = dB = As;
+ break;
+ case GL_ONE_MINUS_SRC_ALPHA:
+ dR = dG = dB = 1.0F - As;
+ break;
+ case GL_DST_ALPHA:
+ dR = dG = dB = Ad;
+ break;
+ case GL_ONE_MINUS_DST_ALPHA:
+ dR = dG = dB = 1.0F - Ad;
+ break;
+ case GL_CONSTANT_COLOR:
+ dR = ctx->Color.BlendColor[0];
+ dG = ctx->Color.BlendColor[1];
+ dB = ctx->Color.BlendColor[2];
+ break;
+ case GL_ONE_MINUS_CONSTANT_COLOR:
+ dR = 1.0F - ctx->Color.BlendColor[0];
+ dG = 1.0F - ctx->Color.BlendColor[1];
+ dB = 1.0F - ctx->Color.BlendColor[2];
+ break;
+ case GL_CONSTANT_ALPHA:
+ dR = dG = dB = ctx->Color.BlendColor[3];
+ break;
+ case GL_ONE_MINUS_CONSTANT_ALPHA:
+ dR = dG = dB = 1.0F - ctx->Color.BlendColor[3];
+ break;
+ case GL_DST_COLOR:
+ dR = Rd;
+ dG = Gd;
+ dB = Bd;
+ break;
+ case GL_ONE_MINUS_DST_COLOR:
+ dR = 1.0F - Rd;
+ dG = 1.0F - Gd;
+ dB = 1.0F - Bd;
+ break;
+ default:
+ /* this should never happen */
+ dR = dG = dB = 0.0F;
+ _mesa_problem(ctx, "Bad blend dest RGB factor in blend_general_float");
+ return;
+ }
+
+ /* Dest Alpha factor */
+ switch (ctx->Color.Blend[0].DstA) {
+ case GL_ZERO:
+ dA = 0.0F;
+ break;
+ case GL_ONE:
+ dA = 1.0F;
+ break;
+ case GL_SRC_COLOR:
+ dA = As;
+ break;
+ case GL_ONE_MINUS_SRC_COLOR:
+ dA = 1.0F - As;
+ break;
+ case GL_SRC_ALPHA:
+ dA = As;
+ break;
+ case GL_ONE_MINUS_SRC_ALPHA:
+ dA = 1.0F - As;
+ break;
+ case GL_DST_ALPHA:
+ dA = Ad;
+ break;
+ case GL_ONE_MINUS_DST_ALPHA:
+ dA = 1.0F - Ad;
+ break;
+ case GL_CONSTANT_COLOR:
+ dA = ctx->Color.BlendColor[3];
+ break;
+ case GL_ONE_MINUS_CONSTANT_COLOR:
+ dA = 1.0F - ctx->Color.BlendColor[3];
+ break;
+ case GL_CONSTANT_ALPHA:
+ dA = ctx->Color.BlendColor[3];
+ break;
+ case GL_ONE_MINUS_CONSTANT_ALPHA:
+ dA = 1.0F - ctx->Color.BlendColor[3];
+ break;
+ case GL_DST_COLOR:
+ dA = Ad;
+ break;
+ case GL_ONE_MINUS_DST_COLOR:
+ dA = 1.0F - Ad;
+ break;
+ default:
+ /* this should never happen */
+ dA = 0.0F;
+ _mesa_problem(ctx, "Bad blend dest A factor in blend_general_float");
+ return;
+ }
+
+ /* compute the blended RGB */
+ switch (ctx->Color.Blend[0].EquationRGB) {
+ case GL_FUNC_ADD:
+ r = Rs * sR + Rd * dR;
+ g = Gs * sG + Gd * dG;
+ b = Bs * sB + Bd * dB;
+ a = As * sA + Ad * dA;
+ break;
+ case GL_FUNC_SUBTRACT:
+ r = Rs * sR - Rd * dR;
+ g = Gs * sG - Gd * dG;
+ b = Bs * sB - Bd * dB;
+ a = As * sA - Ad * dA;
+ break;
+ case GL_FUNC_REVERSE_SUBTRACT:
+ r = Rd * dR - Rs * sR;
+ g = Gd * dG - Gs * sG;
+ b = Bd * dB - Bs * sB;
+ a = Ad * dA - As * sA;
+ break;
+ case GL_MIN:
+ r = MIN2( Rd, Rs );
+ g = MIN2( Gd, Gs );
+ b = MIN2( Bd, Bs );
+ break;
+ case GL_MAX:
+ r = MAX2( Rd, Rs );
+ g = MAX2( Gd, Gs );
+ b = MAX2( Bd, Bs );
+ break;
+ default:
+ /* should never get here */
+ r = g = b = 0.0F; /* silence uninitialized var warning */
+ _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
+ return;
+ }
+
+ /* compute the blended alpha */
+ switch (ctx->Color.Blend[0].EquationA) {
+ case GL_FUNC_ADD:
+ a = As * sA + Ad * dA;
+ break;
+ case GL_FUNC_SUBTRACT:
+ a = As * sA - Ad * dA;
+ break;
+ case GL_FUNC_REVERSE_SUBTRACT:
+ a = Ad * dA - As * sA;
+ break;
+ case GL_MIN:
+ a = MIN2( Ad, As );
+ break;
+ case GL_MAX:
+ a = MAX2( Ad, As );
+ break;
+ default:
+ /* should never get here */
+ a = 0.0F; /* silence uninitialized var warning */
+ _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
+ return;
+ }
+
+ /* final clamping */
+#if 0
+ rgba[i][RCOMP] = MAX2( r, 0.0F );
+ rgba[i][GCOMP] = MAX2( g, 0.0F );
+ rgba[i][BCOMP] = MAX2( b, 0.0F );
+ rgba[i][ACOMP] = CLAMP( a, 0.0F, 1.0F );
+#else
+ ASSIGN_4V(rgba[i], r, g, b, a);
+#endif
+ }
+ }
+}
+
+
+/**
+ * Do any blending operation, any chanType.
+ */
+static void
+blend_general(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ void *src, const void *dst, GLenum chanType)
+{
+ GLfloat (*rgbaF)[4], (*destF)[4];
+
+ rgbaF = (GLfloat (*)[4]) malloc(4 * n * sizeof(GLfloat));
+ destF = (GLfloat (*)[4]) malloc(4 * n * sizeof(GLfloat));
+ if (!rgbaF || !destF) {
+ free(rgbaF);
+ free(destF);
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "blending");
+ return;
+ }
+
+ if (chanType == GL_UNSIGNED_BYTE) {
+ GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
+ const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
+ GLuint i;
+ /* convert ubytes to floats */
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ rgbaF[i][RCOMP] = UBYTE_TO_FLOAT(rgba[i][RCOMP]);
+ rgbaF[i][GCOMP] = UBYTE_TO_FLOAT(rgba[i][GCOMP]);
+ rgbaF[i][BCOMP] = UBYTE_TO_FLOAT(rgba[i][BCOMP]);
+ rgbaF[i][ACOMP] = UBYTE_TO_FLOAT(rgba[i][ACOMP]);
+ destF[i][RCOMP] = UBYTE_TO_FLOAT(dest[i][RCOMP]);
+ destF[i][GCOMP] = UBYTE_TO_FLOAT(dest[i][GCOMP]);
+ destF[i][BCOMP] = UBYTE_TO_FLOAT(dest[i][BCOMP]);
+ destF[i][ACOMP] = UBYTE_TO_FLOAT(dest[i][ACOMP]);
+ }
+ }
+ /* do blend */
+ blend_general_float(ctx, n, mask, rgbaF, destF, chanType);
+ /* convert back to ubytes */
+ for (i = 0; i < n; i++) {
+ if (mask[i])
+ _mesa_unclamped_float_rgba_to_ubyte(rgba[i], rgbaF[i]);
+ }
+ }
+ else if (chanType == GL_UNSIGNED_SHORT) {
+ GLushort (*rgba)[4] = (GLushort (*)[4]) src;
+ const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
+ GLuint i;
+ /* convert ushorts to floats */
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ rgbaF[i][RCOMP] = USHORT_TO_FLOAT(rgba[i][RCOMP]);
+ rgbaF[i][GCOMP] = USHORT_TO_FLOAT(rgba[i][GCOMP]);
+ rgbaF[i][BCOMP] = USHORT_TO_FLOAT(rgba[i][BCOMP]);
+ rgbaF[i][ACOMP] = USHORT_TO_FLOAT(rgba[i][ACOMP]);
+ destF[i][RCOMP] = USHORT_TO_FLOAT(dest[i][RCOMP]);
+ destF[i][GCOMP] = USHORT_TO_FLOAT(dest[i][GCOMP]);
+ destF[i][BCOMP] = USHORT_TO_FLOAT(dest[i][BCOMP]);
+ destF[i][ACOMP] = USHORT_TO_FLOAT(dest[i][ACOMP]);
+ }
+ }
+ /* do blend */
+ blend_general_float(ctx, n, mask, rgbaF, destF, chanType);
+ /* convert back to ushorts */
+ for (i = 0; i < n; i++) {
+ if (mask[i]) {
+ UNCLAMPED_FLOAT_TO_USHORT(rgba[i][RCOMP], rgbaF[i][RCOMP]);
+ UNCLAMPED_FLOAT_TO_USHORT(rgba[i][GCOMP], rgbaF[i][GCOMP]);
+ UNCLAMPED_FLOAT_TO_USHORT(rgba[i][BCOMP], rgbaF[i][BCOMP]);
+ UNCLAMPED_FLOAT_TO_USHORT(rgba[i][ACOMP], rgbaF[i][ACOMP]);
+ }
+ }
+ }
+ else {
+ blend_general_float(ctx, n, mask, (GLfloat (*)[4]) src,
+ (GLfloat (*)[4]) dst, chanType);
+ }
+
+ free(rgbaF);
+ free(destF);
+}
+
+
+
+/**
+ * Analyze current blending parameters to pick fastest blending function.
+ * Result: the ctx->Color.BlendFunc pointer is updated.
+ */
+void
+_swrast_choose_blend_func(struct gl_context *ctx, GLenum chanType)
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ const GLenum eq = ctx->Color.Blend[0].EquationRGB;
+ const GLenum srcRGB = ctx->Color.Blend[0].SrcRGB;
+ const GLenum dstRGB = ctx->Color.Blend[0].DstRGB;
+ const GLenum srcA = ctx->Color.Blend[0].SrcA;
+ const GLenum dstA = ctx->Color.Blend[0].DstA;
+
+ if (ctx->Color.Blend[0].EquationRGB != ctx->Color.Blend[0].EquationA) {
+ swrast->BlendFunc = blend_general;
+ }
+ else if (eq == GL_MIN) {
+ /* Note: GL_MIN ignores the blending weight factors */
+#if defined(USE_MMX_ASM)
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_min;
+ }
+ else
+#endif
+ swrast->BlendFunc = blend_min;
+ }
+ else if (eq == GL_MAX) {
+ /* Note: GL_MAX ignores the blending weight factors */
+#if defined(USE_MMX_ASM)
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_max;
+ }
+ else
+#endif
+ swrast->BlendFunc = blend_max;
+ }
+ else if (srcRGB != srcA || dstRGB != dstA) {
+ swrast->BlendFunc = blend_general;
+ }
+ else if (eq == GL_FUNC_ADD && srcRGB == GL_SRC_ALPHA
+ && dstRGB == GL_ONE_MINUS_SRC_ALPHA) {
+#if defined(USE_MMX_ASM)
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_transparency;
+ }
+ else
+#endif
+ {
+ if (chanType == GL_UNSIGNED_BYTE)
+ swrast->BlendFunc = blend_transparency_ubyte;
+ else if (chanType == GL_UNSIGNED_SHORT)
+ swrast->BlendFunc = blend_transparency_ushort;
+ else
+ swrast->BlendFunc = blend_transparency_float;
+ }
+ }
+ else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ONE) {
+#if defined(USE_MMX_ASM)
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_add;
+ }
+ else
+#endif
+ swrast->BlendFunc = blend_add;
+ }
+ else if (((eq == GL_FUNC_ADD || eq == GL_FUNC_REVERSE_SUBTRACT)
+ && (srcRGB == GL_ZERO && dstRGB == GL_SRC_COLOR))
+ ||
+ ((eq == GL_FUNC_ADD || eq == GL_FUNC_SUBTRACT)
+ && (srcRGB == GL_DST_COLOR && dstRGB == GL_ZERO))) {
+#if defined(USE_MMX_ASM)
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_modulate;
+ }
+ else
+#endif
+ swrast->BlendFunc = blend_modulate;
+ }
+ else if (eq == GL_FUNC_ADD && srcRGB == GL_ZERO && dstRGB == GL_ONE) {
+ swrast->BlendFunc = blend_noop;
+ }
+ else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ZERO) {
+ swrast->BlendFunc = blend_replace;
+ }
+ else {
+ swrast->BlendFunc = blend_general;
+ }
+}
+
+
+
+/**
+ * Apply the blending operator to a span of pixels.
+ * We can handle horizontal runs of pixels (spans) or arrays of x/y
+ * pixel coordinates.
+ */
+void
+_swrast_blend_span(struct gl_context *ctx, struct gl_renderbuffer *rb, SWspan *span)
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ void *rbPixels;
+
+ ASSERT(span->end <= MAX_WIDTH);
+ ASSERT(span->arrayMask & SPAN_RGBA);
+ ASSERT(rb->DataType == span->array->ChanType);
+ ASSERT(!ctx->Color._LogicOpEnabled);
+
+ rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
+
+ swrast->BlendFunc(ctx, span->end, span->array->mask,
+ span->array->rgba, rbPixels, span->array->ChanType);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-30 10:22:07 +0000