/*
* Mesa 3-D graphics library
- * Version: 5.1
*
- * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
+ * 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"),
* 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.
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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 "glheader.h"
-#include "context.h"
-#include "colormac.h"
-#include "macros.h"
-#include "s_alphabuf.h"
+#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
-/*
- * Special case for glBlendFunc(GL_ZERO, GL_ONE)
+/**
+ * Integer divide by 255
+ * Declare "int divtemp" before using.
+ * This satisfies Glean and should be reasonably fast.
+ * Contributed by Nathan Hand.
*/
-static void _BLENDAPI
-blend_noop( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
+#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
+blend_noop(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
{
- GLuint i;
- ASSERT(ctx->Color.BlendEquation==GL_FUNC_ADD_EXT);
- ASSERT(ctx->Color.BlendSrcRGB==GL_ZERO);
- ASSERT(ctx->Color.BlendDstRGB==GL_ONE);
+ 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;
- for (i = 0; i < n; i++) {
- if (mask[i]) {
- COPY_CHAN4( rgba[i], dest[i] );
- }
- }
+ /* 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( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
+static void
+blend_replace(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
{
- ASSERT(ctx->Color.BlendEquation==GL_FUNC_ADD_EXT);
- ASSERT(ctx->Color.BlendSrcRGB==GL_ONE);
- ASSERT(ctx->Color.BlendDstRGB==GL_ZERO);
+ 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) rgba;
- (void) dest;
+ (void) src;
+ (void) dst;
}
-/*
- * Common transparency blending mode.
+/**
+ * Common transparency blending mode:
+ * glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA).
*/
-static void _BLENDAPI
-blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
+static void
+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.BlendEquation==GL_FUNC_ADD_EXT);
- ASSERT(ctx->Color.BlendSrcRGB==GL_SRC_ALPHA);
- ASSERT(ctx->Color.BlendDstRGB==GL_ONE_MINUS_SRC_ALPHA);
+
+ 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++) {
+ for (i = 0; i < n; i++) {
if (mask[i]) {
- const GLchan t = rgba[i][ACOMP]; /* t in [0, CHAN_MAX] */
+ const GLint t = rgba[i][ACOMP]; /* t is in [0, 255] */
if (t == 0) {
/* 0% alpha */
- rgba[i][RCOMP] = dest[i][RCOMP];
- rgba[i][GCOMP] = dest[i][GCOMP];
- rgba[i][BCOMP] = dest[i][BCOMP];
- rgba[i][ACOMP] = dest[i][ACOMP];
- }
- else if (t == CHAN_MAX) {
- /* 100% alpha, no-op */
+ COPY_4UBV(rgba[i], dest[i]);
}
- else {
-#if 0
- /* This is pretty close, but Glean complains */
- const GLint s = CHAN_MAX - t;
- const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s + 1) >> 8;
- const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s + 1) >> 8;
- const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s + 1) >> 8;
- const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s + 1) >> 8;
-#elif 0
- /* This is slower but satisfies Glean */
- const GLint s = CHAN_MAX - t;
- const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) / 255;
- const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) / 255;
- const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) / 255;
- const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) / 255;
-#else
-#if CHAN_BITS == 8
- /* This satisfies Glean and should be reasonably fast */
- /* Contributed by Nathan Hand */
-#if 0
-#define DIV255(X) (((X) << 8) + (X) + 256) >> 16
-#else
- GLint temp;
-#define DIV255(X) (temp = (X), ((temp << 8) + temp + 256) >> 16)
-#endif
+ 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];
-
-#undef DIV255
-#elif CHAN_BITS == 16
- const GLfloat tt = (GLfloat) t / CHAN_MAXF;
- const GLint r = (GLint) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]);
- const GLint g = (GLint) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]);
- const GLint b = (GLint) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]);
- const GLint a = (GLint) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]);
-#else /* CHAN_BITS == 32 */
- const GLfloat tt = (GLfloat) t / CHAN_MAXF;
- const GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP];
- const GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP];
- const GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP];
- const GLfloat a = CLAMP( rgba[i][ACOMP], 0.0F, CHAN_MAXF ) * t +
- CLAMP( dest[i][ACOMP], 0.0F, CHAN_MAXF ) * (1.0F - t);
-#endif
-#endif
- ASSERT(r <= CHAN_MAX);
- ASSERT(g <= CHAN_MAX);
- ASSERT(b <= CHAN_MAX);
- ASSERT(a <= CHAN_MAX);
- rgba[i][RCOMP] = (GLchan) r;
- rgba[i][GCOMP] = (GLchan) g;
- rgba[i][BCOMP] = (GLchan) b;
- rgba[i][ACOMP] = (GLchan) a;
+ 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
+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;
-/*
- * Add src and dest.
- */
-static void _BLENDAPI
-blend_add( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
+ 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
+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.BlendEquation==GL_FUNC_ADD_EXT);
- ASSERT(ctx->Color.BlendSrcRGB==GL_ONE);
- ASSERT(ctx->Color.BlendDstRGB==GL_ONE);
+
+ 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++) {
+ for (i = 0; i < n; i++) {
if (mask[i]) {
-#if CHAN_TYPE == GL_FLOAT
- /* don't RGB clamp to max */
- GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, CHAN_MAXF) + dest[i][ACOMP];
- rgba[i][RCOMP] += dest[i][RCOMP];
- rgba[i][GCOMP] += dest[i][GCOMP];
- rgba[i][BCOMP] += dest[i][BCOMP];
- rgba[i][ACOMP] = (GLchan) MIN2( a, CHAN_MAXF );
-#else
- 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] = (GLchan) MIN2( r, CHAN_MAX );
- rgba[i][GCOMP] = (GLchan) MIN2( g, CHAN_MAX );
- rgba[i][BCOMP] = (GLchan) MIN2( b, CHAN_MAX );
- rgba[i][ACOMP] = (GLchan) MIN2( a, CHAN_MAX );
-#endif
+ 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);
+ }
}
}
}
-/*
- * Blend min function (for GL_EXT_blend_minmax)
+/**
+ * Add src and dest: glBlendFunc(GL_ONE, GL_ONE).
+ * Any chanType ok.
*/
-static void _BLENDAPI
-blend_min( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
+static void
+blend_add(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
{
GLuint i;
- ASSERT(ctx->Color.BlendEquation==GL_MIN_EXT);
+
+ 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;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = (GLchan) MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = (GLchan) MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = (GLchan) MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][ACOMP] = (GLchan) MIN2(CLAMP(rgba[i][ACOMP], 0.0F, CHAN_MAXF),
- dest[i][ACOMP]);
-#else
- rgba[i][ACOMP] = (GLchan) MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
-#endif
+ 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 max function (for GL_EXT_blend_minmax)
+/**
+ * Blend min function.
+ * Any chanType ok.
*/
-static void _BLENDAPI
-blend_max( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
+static void
+blend_min(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
{
GLuint i;
- ASSERT(ctx->Color.BlendEquation==GL_MAX_EXT);
+ assert(ctx->Color.Blend[0].EquationRGB == GL_MIN);
+ assert(ctx->Color.Blend[0].EquationA == GL_MIN);
(void) ctx;
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = (GLchan) MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = (GLchan) MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = (GLchan) MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
-#if CHAN_TYPE == GL_FLOAT
- rgba[i][ACOMP] = (GLchan) MAX2(CLAMP(rgba[i][ACOMP], 0.0F, CHAN_MAXF),
- dest[i][ACOMP]);
-#else
- rgba[i][ACOMP] = (GLchan) MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
-#endif
+ 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
+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( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
+static void
+blend_modulate(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLvoid *src, const GLvoid *dst, GLenum chanType)
{
GLuint i;
(void) ctx;
- for (i=0;i<n;i++) {
- if (mask[i]) {
-#if CHAN_TYPE == GL_FLOAT
- 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];
-#elif CHAN_TYPE == GL_UNSIGNED_SHORT
- GLint r = (rgba[i][RCOMP] * dest[i][RCOMP] + 65535) >> 16;
- GLint g = (rgba[i][GCOMP] * dest[i][GCOMP] + 65535) >> 16;
- GLint b = (rgba[i][BCOMP] * dest[i][BCOMP] + 65535) >> 16;
- GLint a = (rgba[i][ACOMP] * dest[i][ACOMP] + 65535) >> 16;
- rgba[i][RCOMP] = (GLchan) r;
- rgba[i][GCOMP] = (GLchan) g;
- rgba[i][BCOMP] = (GLchan) b;
- rgba[i][ACOMP] = (GLchan) a;
-#else
- GLint r = (rgba[i][RCOMP] * dest[i][RCOMP] + 255) >> 8;
- GLint g = (rgba[i][GCOMP] * dest[i][GCOMP] + 255) >> 8;
- GLint b = (rgba[i][BCOMP] * dest[i][BCOMP] + 255) >> 8;
- GLint a = (rgba[i][ACOMP] * dest[i][ACOMP] + 255) >> 8;
- rgba[i][RCOMP] = (GLchan) r;
- rgba[i][GCOMP] = (GLchan) g;
- rgba[i][BCOMP] = (GLchan) b;
- rgba[i][ACOMP] = (GLchan) a;
-#endif
+ 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];
+ }
}
}
}
-
-/*
- * General case blend pixels.
- * Input: n - number of pixels
- * mask - the usual write mask
- * In/Out: rgba - the incoming and modified pixels
- * Input: dest - the pixels from the dest color buffer
+/**
+ * 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 _BLENDAPI
-blend_general( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLchan rgba[][4], CONST GLchan dest[][4] )
+static void
+blend_general_float(struct gl_context *ctx, GLuint n, const GLubyte mask[],
+ GLfloat rgba[][4], GLfloat dest[][4],
+ GLenum chanType)
{
- const GLfloat rscale = 1.0F / CHAN_MAXF;
- const GLfloat gscale = 1.0F / CHAN_MAXF;
- const GLfloat bscale = 1.0F / CHAN_MAXF;
- const GLfloat ascale = 1.0F / CHAN_MAXF;
GLuint i;
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
if (mask[i]) {
-#if CHAN_TYPE == GL_FLOAT
- GLfloat Rs, Gs, Bs, As; /* Source colors */
- GLfloat Rd, Gd, Bd, Ad; /* Dest colors */
-#else
- GLint Rs, Gs, Bs, As; /* Source colors */
- GLint Rd, Gd, Bd, Ad; /* Dest colors */
-#endif
- GLfloat sR, sG, sB, sA; /* Source scaling */
- GLfloat dR, dG, dB, dA; /* Dest scaling */
- GLfloat r, g, b, a; /* result color */
-
/* Incoming/source Color */
- Rs = rgba[i][RCOMP];
- Gs = rgba[i][GCOMP];
- Bs = rgba[i][BCOMP];
- As = rgba[i][ACOMP];
-#if CHAN_TYPE == GL_FLOAT
- /* clamp */
- Rs = MIN2(Rs, CHAN_MAXF);
- Gs = MIN2(Gs, CHAN_MAXF);
- Bs = MIN2(Bs, CHAN_MAXF);
- As = MIN2(As, CHAN_MAXF);
-#endif
+ 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 */
- Rd = dest[i][RCOMP];
- Gd = dest[i][GCOMP];
- Bd = dest[i][BCOMP];
- Ad = dest[i][ACOMP];
-#if CHAN_TYPE == GL_FLOAT
- /* clamp */
- Rd = MIN2(Rd, CHAN_MAXF);
- Gd = MIN2(Gd, CHAN_MAXF);
- Bd = MIN2(Bd, CHAN_MAXF);
- Ad = MIN2(Ad, CHAN_MAXF);
-#endif
+ 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.BlendSrcRGB) {
+ switch (ctx->Color.Blend[0].SrcRGB) {
case GL_ZERO:
sR = sG = sB = 0.0F;
break;
sR = sG = sB = 1.0F;
break;
case GL_DST_COLOR:
- sR = (GLfloat) Rd * rscale;
- sG = (GLfloat) Gd * gscale;
- sB = (GLfloat) Bd * bscale;
+ sR = Rd;
+ sG = Gd;
+ sB = Bd;
break;
case GL_ONE_MINUS_DST_COLOR:
- sR = 1.0F - (GLfloat) Rd * rscale;
- sG = 1.0F - (GLfloat) Gd * gscale;
- sB = 1.0F - (GLfloat) Bd * bscale;
+ sR = 1.0F - Rd;
+ sG = 1.0F - Gd;
+ sB = 1.0F - Bd;
break;
case GL_SRC_ALPHA:
- sR = sG = sB = (GLfloat) As * ascale;
+ sR = sG = sB = As;
break;
case GL_ONE_MINUS_SRC_ALPHA:
- sR = sG = sB = 1.0F - (GLfloat) As * ascale;
+ sR = sG = sB = 1.0F - As;
break;
case GL_DST_ALPHA:
- sR = sG = sB = (GLfloat) Ad * ascale;
+ sR = sG = sB = Ad;
break;
case GL_ONE_MINUS_DST_ALPHA:
- sR = sG = sB = 1.0F - (GLfloat) Ad * ascale;
+ sR = sG = sB = 1.0F - Ad;
break;
case GL_SRC_ALPHA_SATURATE:
- if (As < CHAN_MAX - Ad) {
- sR = sG = sB = (GLfloat) As * ascale;
+ if (As < 1.0F - Ad) {
+ sR = sG = sB = As;
}
else {
- sR = sG = sB = 1.0F - (GLfloat) Ad * ascale;
+ sR = sG = sB = 1.0F - Ad;
}
break;
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_ALPHA:
sR = sG = sB = 1.0F - ctx->Color.BlendColor[3];
break;
- case GL_SRC_COLOR: /* GL_NV_blend_square */
- sR = (GLfloat) Rs * rscale;
- sG = (GLfloat) Gs * gscale;
- sB = (GLfloat) Bs * bscale;
+ case GL_SRC_COLOR:
+ sR = Rs;
+ sG = Gs;
+ sB = Bs;
break;
- case GL_ONE_MINUS_SRC_COLOR: /* GL_NV_blend_square */
- sR = 1.0F - (GLfloat) Rs * rscale;
- sG = 1.0F - (GLfloat) Gs * gscale;
- sB = 1.0F - (GLfloat) Bs * bscale;
+ 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 do_blend");
+ _mesa_problem(ctx, "Bad blend source RGB factor in blend_general_float");
return;
}
/* Source Alpha factor */
- switch (ctx->Color.BlendSrcA) {
+ switch (ctx->Color.Blend[0].SrcA) {
case GL_ZERO:
sA = 0.0F;
break;
sA = 1.0F;
break;
case GL_DST_COLOR:
- sA = (GLfloat) Ad * ascale;
+ sA = Ad;
break;
case GL_ONE_MINUS_DST_COLOR:
- sA = 1.0F - (GLfloat) Ad * ascale;
+ sA = 1.0F - Ad;
break;
case GL_SRC_ALPHA:
- sA = (GLfloat) As * ascale;
+ sA = As;
break;
case GL_ONE_MINUS_SRC_ALPHA:
- sA = 1.0F - (GLfloat) As * ascale;
+ sA = 1.0F - As;
break;
case GL_DST_ALPHA:
- sA =(GLfloat) Ad * ascale;
+ sA = Ad;
break;
case GL_ONE_MINUS_DST_ALPHA:
- sA = 1.0F - (GLfloat) Ad * ascale;
+ sA = 1.0F - Ad;
break;
case GL_SRC_ALPHA_SATURATE:
sA = 1.0;
case GL_ONE_MINUS_CONSTANT_ALPHA:
sA = 1.0F - ctx->Color.BlendColor[3];
break;
- case GL_SRC_COLOR: /* GL_NV_blend_square */
- sA = (GLfloat) As * ascale;
+ case GL_SRC_COLOR:
+ sA = As;
break;
- case GL_ONE_MINUS_SRC_COLOR: /* GL_NV_blend_square */
- sA = 1.0F - (GLfloat) As * ascale;
+ 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 do_blend");
+ _mesa_problem(ctx, "Bad blend source A factor in blend_general_float");
+ return;
}
/* Dest RGB factor */
- switch (ctx->Color.BlendDstRGB) {
+ switch (ctx->Color.Blend[0].DstRGB) {
case GL_ZERO:
dR = dG = dB = 0.0F;
break;
dR = dG = dB = 1.0F;
break;
case GL_SRC_COLOR:
- dR = (GLfloat) Rs * rscale;
- dG = (GLfloat) Gs * gscale;
- dB = (GLfloat) Bs * bscale;
+ dR = Rs;
+ dG = Gs;
+ dB = Bs;
break;
case GL_ONE_MINUS_SRC_COLOR:
- dR = 1.0F - (GLfloat) Rs * rscale;
- dG = 1.0F - (GLfloat) Gs * gscale;
- dB = 1.0F - (GLfloat) Bs * bscale;
+ dR = 1.0F - Rs;
+ dG = 1.0F - Gs;
+ dB = 1.0F - Bs;
break;
case GL_SRC_ALPHA:
- dR = dG = dB = (GLfloat) As * ascale;
+ dR = dG = dB = As;
break;
case GL_ONE_MINUS_SRC_ALPHA:
- dR = dG = dB = 1.0F - (GLfloat) As * ascale;
+ dR = dG = dB = 1.0F - As;
break;
case GL_DST_ALPHA:
- dR = dG = dB = (GLfloat) Ad * ascale;
+ dR = dG = dB = Ad;
break;
case GL_ONE_MINUS_DST_ALPHA:
- dR = dG = dB = 1.0F - (GLfloat) Ad * ascale;
+ dR = dG = dB = 1.0F - Ad;
break;
case GL_CONSTANT_COLOR:
dR = ctx->Color.BlendColor[0];
case GL_ONE_MINUS_CONSTANT_ALPHA:
dR = dG = dB = 1.0F - ctx->Color.BlendColor[3];
break;
- case GL_DST_COLOR: /* GL_NV_blend_square */
- dR = (GLfloat) Rd * rscale;
- dG = (GLfloat) Gd * gscale;
- dB = (GLfloat) Bd * bscale;
+ case GL_DST_COLOR:
+ dR = Rd;
+ dG = Gd;
+ dB = Bd;
break;
- case GL_ONE_MINUS_DST_COLOR: /* GL_NV_blend_square */
- dR = 1.0F - (GLfloat) Rd * rscale;
- dG = 1.0F - (GLfloat) Gd * gscale;
- dB = 1.0F - (GLfloat) Bd * bscale;
+ 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 do_blend");
+ _mesa_problem(ctx, "Bad blend dest RGB factor in blend_general_float");
+ return;
}
/* Dest Alpha factor */
- switch (ctx->Color.BlendDstA) {
+ switch (ctx->Color.Blend[0].DstA) {
case GL_ZERO:
dA = 0.0F;
break;
dA = 1.0F;
break;
case GL_SRC_COLOR:
- dA = (GLfloat) As * ascale;
+ dA = As;
break;
case GL_ONE_MINUS_SRC_COLOR:
- dA = 1.0F - (GLfloat) As * ascale;
+ dA = 1.0F - As;
break;
case GL_SRC_ALPHA:
- dA = (GLfloat) As * ascale;
+ dA = As;
break;
case GL_ONE_MINUS_SRC_ALPHA:
- dA = 1.0F - (GLfloat) As * ascale;
+ dA = 1.0F - As;
break;
case GL_DST_ALPHA:
- dA = (GLfloat) Ad * ascale;
+ dA = Ad;
break;
case GL_ONE_MINUS_DST_ALPHA:
- dA = 1.0F - (GLfloat) Ad * ascale;
+ dA = 1.0F - Ad;
break;
case GL_CONSTANT_COLOR:
dA = ctx->Color.BlendColor[3];
case GL_ONE_MINUS_CONSTANT_ALPHA:
dA = 1.0F - ctx->Color.BlendColor[3];
break;
- case GL_DST_COLOR: /* GL_NV_blend_square */
- dA = (GLfloat) Ad * ascale;
+ case GL_DST_COLOR:
+ dA = Ad;
break;
- case GL_ONE_MINUS_DST_COLOR: /* GL_NV_blend_square */
- dA = 1.0F - (GLfloat) Ad * ascale;
+ 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 do_blend");
+ _mesa_problem(ctx, "Bad blend dest A factor in blend_general_float");
return;
}
- /* Due to round-off problems we have to clamp against zero. */
- /* Optimization: we don't have to do this for all src & dst factors */
- if (dA < 0.0F) dA = 0.0F;
- if (dR < 0.0F) dR = 0.0F;
- if (dG < 0.0F) dG = 0.0F;
- if (dB < 0.0F) dB = 0.0F;
- if (sA < 0.0F) sA = 0.0F;
- if (sR < 0.0F) sR = 0.0F;
- if (sG < 0.0F) sG = 0.0F;
- if (sB < 0.0F) sB = 0.0F;
-
- ASSERT( sR <= 1.0 );
- ASSERT( sG <= 1.0 );
- ASSERT( sB <= 1.0 );
- ASSERT( sA <= 1.0 );
- ASSERT( dR <= 1.0 );
- ASSERT( dG <= 1.0 );
- ASSERT( dB <= 1.0 );
- ASSERT( dA <= 1.0 );
-
- /* compute blended color */
-#if CHAN_TYPE == GL_FLOAT
- if (ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) {
+ /* 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;
- }
- else if (ctx->Color.BlendEquation==GL_FUNC_SUBTRACT_EXT) {
+ 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;
- }
- else if (ctx->Color.BlendEquation==GL_FUNC_REVERSE_SUBTRACT_EXT) {
+ 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;
}
- else {
+
+ /* 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 */
- r = g = b = a = 0.0F; /* silence uninitialized var warning */
+ 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, CHAN_MAXF );
+ rgba[i][ACOMP] = CLAMP( a, 0.0F, 1.0F );
#else
- if (ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) {
- r = Rs * sR + Rd * dR + 0.5F;
- g = Gs * sG + Gd * dG + 0.5F;
- b = Bs * sB + Bd * dB + 0.5F;
- a = As * sA + Ad * dA + 0.5F;
- }
- else if (ctx->Color.BlendEquation==GL_FUNC_SUBTRACT_EXT) {
- r = Rs * sR - Rd * dR + 0.5F;
- g = Gs * sG - Gd * dG + 0.5F;
- b = Bs * sB - Bd * dB + 0.5F;
- a = As * sA - Ad * dA + 0.5F;
- }
- else if (ctx->Color.BlendEquation==GL_FUNC_REVERSE_SUBTRACT_EXT) {
- r = Rd * dR - Rs * sR + 0.5F;
- g = Gd * dG - Gs * sG + 0.5F;
- b = Bd * dB - Bs * sB + 0.5F;
- a = Ad * dA - As * sA + 0.5F;
- }
- else {
- /* should never get here */
- r = g = b = a = 0.0F; /* silence uninitialized var warning */
- _mesa_problem(ctx, "unexpected BlendEquation in blend_general()");
- }
-
- /* final clamping */
- rgba[i][RCOMP] = (GLchan) (GLint) CLAMP( r, 0.0F, CHAN_MAXF );
- rgba[i][GCOMP] = (GLchan) (GLint) CLAMP( g, 0.0F, CHAN_MAXF );
- rgba[i][BCOMP] = (GLchan) (GLint) CLAMP( b, 0.0F, CHAN_MAXF );
- rgba[i][ACOMP] = (GLchan) (GLint) CLAMP( a, 0.0F, CHAN_MAXF );
+ 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( GLcontext *ctx )
+void
+_swrast_choose_blend_func(struct gl_context *ctx, GLenum chanType)
{
- const GLenum eq = ctx->Color.BlendEquation;
- const GLenum srcRGB = ctx->Color.BlendSrcRGB;
- const GLenum dstRGB = ctx->Color.BlendDstRGB;
- const GLenum srcA = ctx->Color.BlendSrcA;
- const GLenum dstA = ctx->Color.BlendDstA;
-
- if (srcRGB != srcA || dstRGB != dstA) {
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_general;
+ 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_FUNC_ADD_EXT && srcRGB==GL_SRC_ALPHA
- && dstRGB==GL_ONE_MINUS_SRC_ALPHA) {
+ else if (eq == GL_MIN) {
+ /* Note: GL_MIN ignores the blending weight factors */
#if defined(USE_MMX_ASM)
- if ( cpu_has_mmx ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_transparency;
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_min;
}
else
#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_transparency;
+ swrast->BlendFunc = blend_min;
}
- else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_ONE && dstRGB==GL_ONE) {
+ else if (eq == GL_MAX) {
+ /* Note: GL_MAX ignores the blending weight factors */
#if defined(USE_MMX_ASM)
- if ( cpu_has_mmx ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_add;
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_max;
}
else
#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_add;
+ swrast->BlendFunc = blend_max;
}
- else if (((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_REVERSE_SUBTRACT_EXT)
- && (srcRGB==GL_ZERO && dstRGB==GL_SRC_COLOR))
- ||
- ((eq==GL_FUNC_ADD_EXT || eq==GL_FUNC_SUBTRACT_EXT)
- && (srcRGB==GL_DST_COLOR && dstRGB==GL_ZERO))) {
+ 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 ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_modulate;
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_transparency;
}
else
#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_modulate;
+ {
+ 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_MIN_EXT) {
+ else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ONE) {
#if defined(USE_MMX_ASM)
- if ( cpu_has_mmx ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_min;
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_add;
}
else
#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_min;
+ swrast->BlendFunc = blend_add;
}
- else if (eq==GL_MAX_EXT) {
+ 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 ) {
- SWRAST_CONTEXT(ctx)->BlendFunc = _mesa_mmx_blend_max;
+ if (cpu_has_mmx && chanType == GL_UNSIGNED_BYTE) {
+ swrast->BlendFunc = _mesa_mmx_blend_modulate;
}
else
#endif
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_max;
+ swrast->BlendFunc = blend_modulate;
}
- else if (eq==GL_FUNC_ADD_EXT && srcRGB == GL_ZERO && dstRGB == GL_ONE) {
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_noop;
+ else if (eq == GL_FUNC_ADD && srcRGB == GL_ZERO && dstRGB == GL_ONE) {
+ swrast->BlendFunc = blend_noop;
}
- else if (eq==GL_FUNC_ADD_EXT && srcRGB == GL_ONE && dstRGB == GL_ZERO) {
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_replace;
+ else if (eq == GL_FUNC_ADD && srcRGB == GL_ONE && dstRGB == GL_ZERO) {
+ swrast->BlendFunc = blend_replace;
}
else {
- SWRAST_CONTEXT(ctx)->BlendFunc = blend_general;
+ 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( GLcontext *ctx, const struct sw_span *span,
- GLchan rgba[][4] )
+_swrast_blend_span(struct gl_context *ctx, struct gl_renderbuffer *rb, SWspan *span)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
- GLchan framebuffer[MAX_WIDTH][4];
-
- ASSERT(span->end <= MAX_WIDTH);
- ASSERT(span->arrayMask & SPAN_RGBA);
- ASSERT(!ctx->Color._LogicOpEnabled);
-
- /* Read span of current frame buffer pixels */
- if (span->arrayMask & SPAN_XY) {
- /* array of x/y pixel coords */
- (*swrast->Driver.ReadRGBAPixels)( ctx, span->end,
- span->array->x, span->array->y,
- framebuffer, span->array->mask );
- if (swrast->_RasterMask & ALPHABUF_BIT) {
- _swrast_read_alpha_pixels( ctx, span->end,
- span->array->x, span->array->y,
- framebuffer, span->array->mask );
- }
- }
- else {
- /* horizontal run of pixels */
- _swrast_read_rgba_span( ctx, ctx->DrawBuffer, span->end,
- span->x, span->y, framebuffer );
- }
+ void *rbPixels;
+
+ assert(span->end <= SWRAST_MAX_WIDTH);
+ assert(span->arrayMask & SPAN_RGBA);
+ assert(!ctx->Color.ColorLogicOpEnabled);
+
+ rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
- SWRAST_CONTEXT(ctx)->BlendFunc( ctx, span->end, span->array->mask, rgba,
- (const GLchan (*)[4]) framebuffer );
+ swrast->BlendFunc(ctx, span->end, span->array->mask,
+ span->array->rgba, rbPixels, span->array->ChanType);
}
projects / mesa.git / blobdiff