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673 lines
21 KiB
C
673 lines
21 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file swrast/s_blend.c
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* \brief software blending.
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* \author Brian Paul
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*
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* Only a few blend modes have been optimized (min, max, transparency, add)
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* more optimized cases can easily be added if needed.
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* Celestia uses glBlendFunc(GL_SRC_ALPHA, GL_ONE), for example.
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*/
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#include <precomp.h>
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#if defined(USE_MMX_ASM)
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#include "x86/mmx.h"
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#include "x86/common_x86_asm.h"
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#define _BLENDAPI _ASMAPI
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#else
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#define _BLENDAPI
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#endif
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/**
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* Integer divide by 255
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* Declare "int divtemp" before using.
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* This satisfies Glean and should be reasonably fast.
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* Contributed by Nathan Hand.
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*/
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#define DIV255(X) (divtemp = (X), ((divtemp << 8) + divtemp + 256) >> 16)
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/**
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* Special case for glBlendFunc(GL_ZERO, GL_ONE).
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* No-op means the framebuffer values remain unchanged.
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* Any chanType ok.
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*/
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static void _BLENDAPI
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blend_noop(struct gl_context *ctx, GLuint n, const GLubyte mask[],
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GLvoid *src, const GLvoid *dst, GLenum chanType)
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{
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GLint bytes;
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ASSERT(ctx->Color.EquationRGB == GL_FUNC_ADD);
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ASSERT(ctx->Color.EquationA == GL_FUNC_ADD);
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ASSERT(ctx->Color.SrcRGB == GL_ZERO);
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ASSERT(ctx->Color.DstRGB == GL_ONE);
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(void) ctx;
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/* just memcpy */
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if (chanType == GL_UNSIGNED_BYTE)
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bytes = 4 * n * sizeof(GLubyte);
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else if (chanType == GL_UNSIGNED_SHORT)
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bytes = 4 * n * sizeof(GLushort);
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else
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bytes = 4 * n * sizeof(GLfloat);
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memcpy(src, dst, bytes);
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}
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/**
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* Special case for glBlendFunc(GL_ONE, GL_ZERO)
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* Any chanType ok.
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*/
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static void _BLENDAPI
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blend_replace(struct gl_context *ctx, GLuint n, const GLubyte mask[],
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GLvoid *src, const GLvoid *dst, GLenum chanType)
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{
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ASSERT(ctx->Color.EquationRGB == GL_FUNC_ADD);
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ASSERT(ctx->Color.EquationA == GL_FUNC_ADD);
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ASSERT(ctx->Color.SrcRGB == GL_ONE);
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ASSERT(ctx->Color.DstRGB == GL_ZERO);
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(void) ctx;
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(void) n;
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(void) mask;
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(void) src;
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(void) dst;
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}
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/**
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* Common transparency blending mode:
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* glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA).
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*/
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static void _BLENDAPI
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blend_transparency_ubyte(struct gl_context *ctx, GLuint n, const GLubyte mask[],
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GLvoid *src, const GLvoid *dst, GLenum chanType)
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{
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GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
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const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
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GLuint i;
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ASSERT(ctx->Color.EquationRGB == GL_FUNC_ADD);
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ASSERT(ctx->Color.EquationA == GL_FUNC_ADD);
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ASSERT(ctx->Color.SrcRGB == GL_SRC_ALPHA);
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ASSERT(ctx->Color.SrcA == GL_SRC_ALPHA);
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ASSERT(ctx->Color.DstRGB == GL_ONE_MINUS_SRC_ALPHA);
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ASSERT(ctx->Color.DstA == GL_ONE_MINUS_SRC_ALPHA);
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ASSERT(chanType == GL_UNSIGNED_BYTE);
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(void) ctx;
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for (i = 0; i < n; i++) {
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if (mask[i]) {
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const GLint t = rgba[i][ACOMP]; /* t is in [0, 255] */
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if (t == 0) {
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/* 0% alpha */
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COPY_4UBV(rgba[i], dest[i]);
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}
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else if (t != 255) {
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GLint divtemp;
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const GLint r = DIV255((rgba[i][RCOMP] - dest[i][RCOMP]) * t) + dest[i][RCOMP];
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const GLint g = DIV255((rgba[i][GCOMP] - dest[i][GCOMP]) * t) + dest[i][GCOMP];
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const GLint b = DIV255((rgba[i][BCOMP] - dest[i][BCOMP]) * t) + dest[i][BCOMP];
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const GLint a = DIV255((rgba[i][ACOMP] - dest[i][ACOMP]) * t) + dest[i][ACOMP];
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ASSERT(r <= 255);
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ASSERT(g <= 255);
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ASSERT(b <= 255);
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ASSERT(a <= 255);
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rgba[i][RCOMP] = (GLubyte) r;
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rgba[i][GCOMP] = (GLubyte) g;
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rgba[i][BCOMP] = (GLubyte) b;
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rgba[i][ACOMP] = (GLubyte) a;
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}
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}
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}
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}
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static void _BLENDAPI
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blend_transparency_ushort(struct gl_context *ctx, GLuint n, const GLubyte mask[],
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GLvoid *src, const GLvoid *dst, GLenum chanType)
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{
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GLushort (*rgba)[4] = (GLushort (*)[4]) src;
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const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
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GLuint i;
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ASSERT(ctx->Color.EquationRGB == GL_FUNC_ADD);
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ASSERT(ctx->Color.EquationA == GL_FUNC_ADD);
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ASSERT(ctx->Color.SrcRGB == GL_SRC_ALPHA);
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ASSERT(ctx->Color.SrcA == GL_SRC_ALPHA);
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ASSERT(ctx->Color.DstRGB == GL_ONE_MINUS_SRC_ALPHA);
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ASSERT(ctx->Color.DstA == GL_ONE_MINUS_SRC_ALPHA);
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ASSERT(chanType == GL_UNSIGNED_SHORT);
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(void) ctx;
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for (i = 0; i < n; i++) {
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if (mask[i]) {
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const GLint t = rgba[i][ACOMP];
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if (t == 0) {
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/* 0% alpha */
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COPY_4V(rgba[i], dest[i]);
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}
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else if (t != 65535) {
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const GLfloat tt = (GLfloat) t / 65535.0F;
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GLushort r = (GLushort) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]);
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GLushort g = (GLushort) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]);
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GLushort b = (GLushort) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]);
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GLushort a = (GLushort) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]);
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ASSIGN_4V(rgba[i], r, g, b, a);
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}
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}
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}
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}
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static void _BLENDAPI
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blend_transparency_float(struct gl_context *ctx, GLuint n, const GLubyte mask[],
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GLvoid *src, const GLvoid *dst, GLenum chanType)
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{
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GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
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const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
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GLuint i;
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ASSERT(ctx->Color.EquationRGB == GL_FUNC_ADD);
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ASSERT(ctx->Color.EquationA == GL_FUNC_ADD);
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ASSERT(ctx->Color.SrcRGB == GL_SRC_ALPHA);
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ASSERT(ctx->Color.SrcA == GL_SRC_ALPHA);
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ASSERT(ctx->Color.DstRGB == GL_ONE_MINUS_SRC_ALPHA);
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ASSERT(ctx->Color.DstA == GL_ONE_MINUS_SRC_ALPHA);
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ASSERT(chanType == GL_FLOAT);
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(void) ctx;
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for (i = 0; i < n; i++) {
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if (mask[i]) {
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const GLfloat t = rgba[i][ACOMP]; /* t in [0, 1] */
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if (t == 0.0F) {
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/* 0% alpha */
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COPY_4V(rgba[i], dest[i]);
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}
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else if (t != 1.0F) {
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GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * t + dest[i][RCOMP];
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GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * t + dest[i][GCOMP];
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GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * t + dest[i][BCOMP];
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GLfloat a = (rgba[i][ACOMP] - dest[i][ACOMP]) * t + dest[i][ACOMP];
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ASSIGN_4V(rgba[i], r, g, b, a);
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}
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}
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}
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}
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/**
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* Add src and dest: glBlendFunc(GL_ONE, GL_ONE).
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* Any chanType ok.
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*/
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static void _BLENDAPI
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blend_add(struct gl_context *ctx, GLuint n, const GLubyte mask[],
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GLvoid *src, const GLvoid *dst, GLenum chanType)
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{
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GLuint i;
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ASSERT(ctx->Color.EquationRGB == GL_FUNC_ADD);
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ASSERT(ctx->Color.EquationA == GL_FUNC_ADD);
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ASSERT(ctx->Color.SrcRGB == GL_ONE);
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ASSERT(ctx->Color.DstRGB == GL_ONE);
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(void) ctx;
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if (chanType == GL_UNSIGNED_BYTE) {
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GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
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const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
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for (i=0;i<n;i++) {
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if (mask[i]) {
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GLint r = rgba[i][RCOMP] + dest[i][RCOMP];
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GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
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GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
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GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
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rgba[i][RCOMP] = (GLubyte) MIN2( r, 255 );
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rgba[i][GCOMP] = (GLubyte) MIN2( g, 255 );
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rgba[i][BCOMP] = (GLubyte) MIN2( b, 255 );
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rgba[i][ACOMP] = (GLubyte) MIN2( a, 255 );
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}
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}
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}
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else if (chanType == GL_UNSIGNED_SHORT) {
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GLushort (*rgba)[4] = (GLushort (*)[4]) src;
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const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
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for (i=0;i<n;i++) {
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if (mask[i]) {
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GLint r = rgba[i][RCOMP] + dest[i][RCOMP];
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GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
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GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
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GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
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rgba[i][RCOMP] = (GLshort) MIN2( r, 255 );
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rgba[i][GCOMP] = (GLshort) MIN2( g, 255 );
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rgba[i][BCOMP] = (GLshort) MIN2( b, 255 );
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rgba[i][ACOMP] = (GLshort) MIN2( a, 255 );
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}
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}
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}
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else {
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GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
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const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
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ASSERT(chanType == GL_FLOAT);
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for (i=0;i<n;i++) {
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if (mask[i]) {
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/* don't RGB clamp to max */
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rgba[i][RCOMP] += dest[i][RCOMP];
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rgba[i][GCOMP] += dest[i][GCOMP];
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rgba[i][BCOMP] += dest[i][BCOMP];
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rgba[i][ACOMP] += dest[i][ACOMP];
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}
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}
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}
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}
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/**
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* Modulate: result = src * dest
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* Any chanType ok.
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*/
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static void _BLENDAPI
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blend_modulate(struct gl_context *ctx, GLuint n, const GLubyte mask[],
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GLvoid *src, const GLvoid *dst, GLenum chanType)
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{
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GLuint i;
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(void) ctx;
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if (chanType == GL_UNSIGNED_BYTE) {
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GLubyte (*rgba)[4] = (GLubyte (*)[4]) src;
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const GLubyte (*dest)[4] = (const GLubyte (*)[4]) dst;
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for (i=0;i<n;i++) {
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if (mask[i]) {
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GLint divtemp;
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rgba[i][RCOMP] = DIV255(rgba[i][RCOMP] * dest[i][RCOMP]);
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rgba[i][GCOMP] = DIV255(rgba[i][GCOMP] * dest[i][GCOMP]);
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rgba[i][BCOMP] = DIV255(rgba[i][BCOMP] * dest[i][BCOMP]);
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rgba[i][ACOMP] = DIV255(rgba[i][ACOMP] * dest[i][ACOMP]);
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}
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}
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}
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else if (chanType == GL_UNSIGNED_SHORT) {
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GLushort (*rgba)[4] = (GLushort (*)[4]) src;
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const GLushort (*dest)[4] = (const GLushort (*)[4]) dst;
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for (i=0;i<n;i++) {
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if (mask[i]) {
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rgba[i][RCOMP] = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16;
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rgba[i][GCOMP] = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16;
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rgba[i][BCOMP] = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16;
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rgba[i][ACOMP] = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16;
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}
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}
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}
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else {
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GLfloat (*rgba)[4] = (GLfloat (*)[4]) src;
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const GLfloat (*dest)[4] = (const GLfloat (*)[4]) dst;
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ASSERT(chanType == GL_FLOAT);
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for (i=0;i<n;i++) {
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if (mask[i]) {
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rgba[i][RCOMP] = rgba[i][RCOMP] * dest[i][RCOMP];
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rgba[i][GCOMP] = rgba[i][GCOMP] * dest[i][GCOMP];
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rgba[i][BCOMP] = rgba[i][BCOMP] * dest[i][BCOMP];
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rgba[i][ACOMP] = rgba[i][ACOMP] * dest[i][ACOMP];
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}
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}
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}
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}
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/**
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* Do any blending operation, using floating point.
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* \param n number of pixels
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* \param mask fragment writemask array
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* \param rgba array of incoming (and modified) pixels
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* \param dest array of pixels from the dest color buffer
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*/
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static void
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blend_general_float(struct gl_context *ctx, GLuint n, const GLubyte mask[],
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GLfloat rgba[][4], GLfloat dest[][4],
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GLenum chanType)
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{
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GLuint i;
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for (i = 0; i < n; i++) {
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if (mask[i]) {
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/* Incoming/source Color */
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const GLfloat Rs = rgba[i][RCOMP];
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const GLfloat Gs = rgba[i][GCOMP];
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const GLfloat Bs = rgba[i][BCOMP];
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const GLfloat As = rgba[i][ACOMP];
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/* Frame buffer/dest color */
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const GLfloat Rd = dest[i][RCOMP];
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const GLfloat Gd = dest[i][GCOMP];
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const GLfloat Bd = dest[i][BCOMP];
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const GLfloat Ad = dest[i][ACOMP];
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GLfloat sR, sG, sB, sA; /* Source factor */
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GLfloat dR, dG, dB, dA; /* Dest factor */
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GLfloat r, g, b, a; /* result color */
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/* XXX for the case of constant blend terms we could init
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* the sX and dX variables just once before the loop.
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*/
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/* Source RGB factor */
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switch (ctx->Color.SrcFactor) {
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case GL_ZERO:
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sR = sG = sB = sA = 0.0F;
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break;
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case GL_ONE:
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sR = sG = sB = sA = 1.0F;
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break;
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case GL_DST_COLOR:
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sR = Rd;
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sG = Gd;
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sB = Bd;
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sA = Ad;
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break;
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case GL_ONE_MINUS_DST_COLOR:
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sR = 1.0F - Rd;
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sG = 1.0F - Gd;
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sB = 1.0F - Bd;
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sA = 1.0f - Ad;
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break;
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case GL_SRC_ALPHA:
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sR = sG = sB = sA = As;
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break;
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case GL_ONE_MINUS_SRC_ALPHA:
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sR = sG = sB = sA = 1.0F - As;
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break;
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case GL_DST_ALPHA:
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sR = sG = sB = sA = Ad;
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break;
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case GL_ONE_MINUS_DST_ALPHA:
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sR = sG = sB = sA = 1.0F - Ad;
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break;
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case GL_SRC_ALPHA_SATURATE:
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if (As < 1.0F - Ad) {
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sR = sG = sB = sA = As;
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}
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else {
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sR = sG = sB = sA = 1.0F - Ad;
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}
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break;
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case GL_SRC_COLOR:
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sR = Rs;
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sG = Gs;
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sB = Bs;
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sA = As;
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break;
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case GL_ONE_MINUS_SRC_COLOR:
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sR = 1.0F - Rs;
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sG = 1.0F - Gs;
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sB = 1.0F - Bs;
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sA = 1.0F - As;
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break;
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default:
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/* this should never happen */
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_mesa_problem(ctx, "Bad blend source RGB factor in blend_general_float");
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return;
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}
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/* Dest factor */
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switch (ctx->Color.DstFactor) {
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case GL_ZERO:
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dR = dG = dB = dA = 0.0F;
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break;
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case GL_ONE:
|
|
dR = dG = dB = dA = 1.0F;
|
|
break;
|
|
case GL_SRC_COLOR:
|
|
dR = Rs;
|
|
dG = Gs;
|
|
dB = Bs;
|
|
dA = As;
|
|
break;
|
|
case GL_ONE_MINUS_SRC_COLOR:
|
|
dR = 1.0F - Rs;
|
|
dG = 1.0F - Gs;
|
|
dB = 1.0F - Bs;
|
|
dA = 1.0F - As;
|
|
break;
|
|
case GL_SRC_ALPHA:
|
|
dR = dG = dB = dA = As;
|
|
break;
|
|
case GL_ONE_MINUS_SRC_ALPHA:
|
|
dR = dG = dB = dA = 1.0F - As;
|
|
break;
|
|
case GL_DST_ALPHA:
|
|
dR = dG = dB = dA = Ad;
|
|
break;
|
|
case GL_ONE_MINUS_DST_ALPHA:
|
|
dR = dG = dB = dA = 1.0F - Ad;
|
|
break;
|
|
case GL_DST_COLOR:
|
|
dR = Rd;
|
|
dG = Gd;
|
|
dB = Bd;
|
|
dA = Ad;
|
|
break;
|
|
case GL_ONE_MINUS_DST_COLOR:
|
|
dR = 1.0F - Rd;
|
|
dG = 1.0F - Gd;
|
|
dB = 1.0F - Bd;
|
|
dA = 1.0F - Ad;
|
|
break;
|
|
default:
|
|
/* this should never happen */
|
|
dR = dG = dB = dA = 0.0F;
|
|
_mesa_problem(ctx, "Bad blend dest factor in blend_general_float");
|
|
return;
|
|
}
|
|
|
|
/* compute the blended RGBA */
|
|
r = Rs * sR + Rd * dR;
|
|
g = Gs * sG + Gd * dG;
|
|
b = Bs * sB + Bd * dB;
|
|
a = As * sA + Ad * dA;
|
|
|
|
/* 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 srcFactor = ctx->Color.SrcFactor;
|
|
const GLenum dstFactor = ctx->Color.DstFactor;
|
|
|
|
if (srcFactor == GL_SRC_ALPHA && dstFactor == 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 (srcFactor == GL_ONE && dstFactor == 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 ((srcFactor == GL_ZERO && dstFactor == GL_SRC_COLOR)
|
|
|| (srcFactor == GL_DST_COLOR && dstFactor == 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 (srcFactor == GL_ZERO && dstFactor == GL_ONE) {
|
|
swrast->BlendFunc = blend_noop;
|
|
}
|
|
else if (srcFactor == GL_ONE && dstFactor == 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(!ctx->Color.ColorLogicOpEnabled);
|
|
|
|
rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
|
|
|
|
swrast->BlendFunc(ctx, span->end, span->array->mask,
|
|
span->array->rgba, rbPixels, span->array->ChanType);
|
|
}
|