-/* $Id: blend.c,v 1.14 2000/04/11 21:38:08 brianp Exp $ */
+/* $Id: blend.c,v 1.32 2001/03/29 16:50:31 brianp Exp $ */
/*
* Mesa 3-D graphics library
- * Version: 3.3
- *
- * Copyright (C) 1999 Brian Paul All Rights Reserved.
- *
+ * Version: 3.5
+ *
+ * Copyright (C) 1999-2001 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
*/
-
#ifdef PC_HEADER
#include "all.h"
#else
#include "glheader.h"
-#include "alphabuf.h"
#include "blend.h"
#include "context.h"
#include "enums.h"
#include "macros.h"
-#include "pb.h"
-#include "span.h"
-#include "types.h"
+#include "mtypes.h"
#endif
void
_mesa_BlendFunc( GLenum sfactor, GLenum dfactor )
{
+
GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glBlendFunc");
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
fprintf(stderr, "glBlendFunc %s %s\n",
- gl_lookup_enum_by_nr(sfactor),
- gl_lookup_enum_by_nr(dfactor));
+ _mesa_lookup_enum_by_nr(sfactor),
+ _mesa_lookup_enum_by_nr(dfactor));
switch (sfactor) {
+ case GL_SRC_COLOR:
+ case GL_ONE_MINUS_SRC_COLOR:
+ if (!ctx->Extensions.NV_blend_square) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glBlendFunc(sfactor)" );
+ return;
+ }
+ /* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_DST_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
- ctx->Color.BlendSrcRGB = ctx->Color.BlendSrcA = sfactor;
break;
default:
- gl_error( ctx, GL_INVALID_ENUM, "glBlendFunc(sfactor)" );
+ _mesa_error( ctx, GL_INVALID_ENUM, "glBlendFunc(sfactor)" );
return;
}
switch (dfactor) {
+ case GL_DST_COLOR:
+ case GL_ONE_MINUS_DST_COLOR:
+ if (!ctx->Extensions.NV_blend_square) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glBlendFunc(dfactor)" );
+ return;
+ }
+ /* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
- ctx->Color.BlendDstRGB = ctx->Color.BlendDstA = dfactor;
break;
default:
- gl_error( ctx, GL_INVALID_ENUM, "glBlendFunc(dfactor)" );
+ _mesa_error( ctx, GL_INVALID_ENUM, "glBlendFunc(dfactor)" );
return;
}
- if (ctx->Driver.BlendFunc) {
- (*ctx->Driver.BlendFunc)( ctx, sfactor, dfactor );
- }
+ if (ctx->Color.BlendDstRGB == dfactor &&
+ ctx->Color.BlendSrcRGB == sfactor &&
+ ctx->Color.BlendDstA == dfactor &&
+ ctx->Color.BlendSrcA == sfactor)
+ return;
- ctx->Color.BlendFunc = NULL;
- ctx->NewState |= NEW_RASTER_OPS;
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ ctx->Color.BlendDstRGB = ctx->Color.BlendDstA = dfactor;
+ ctx->Color.BlendSrcRGB = ctx->Color.BlendSrcA = sfactor;
+
+ if (ctx->Driver.BlendFunc)
+ ctx->Driver.BlendFunc( ctx, sfactor, dfactor );
}
GLenum sfactorA, GLenum dfactorA )
{
GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glBlendFuncSeparate");
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
- fprintf(stderr, "glBlendFuncSeperate %s %s %s %s\n",
- gl_lookup_enum_by_nr(sfactorRGB),
- gl_lookup_enum_by_nr(dfactorRGB),
- gl_lookup_enum_by_nr(sfactorA),
- gl_lookup_enum_by_nr(dfactorA));
+ fprintf(stderr, "glBlendFuncSeparate %s %s %s %s\n",
+ _mesa_lookup_enum_by_nr(sfactorRGB),
+ _mesa_lookup_enum_by_nr(dfactorRGB),
+ _mesa_lookup_enum_by_nr(sfactorA),
+ _mesa_lookup_enum_by_nr(dfactorA));
switch (sfactorRGB) {
+ case GL_SRC_COLOR:
+ case GL_ONE_MINUS_SRC_COLOR:
+ if (!ctx->Extensions.NV_blend_square) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(sfactorRGB)");
+ return;
+ }
+ /* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_DST_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
- ctx->Color.BlendSrcRGB = sfactorRGB;
break;
default:
- gl_error( ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(sfactorRGB)" );
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(sfactorRGB)");
return;
}
switch (dfactorRGB) {
+ case GL_DST_COLOR:
+ case GL_ONE_MINUS_DST_COLOR:
+ if (!ctx->Extensions.NV_blend_square) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorRGB)");
+ return;
+ }
+ /* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
- ctx->Color.BlendDstRGB = dfactorRGB;
break;
default:
- gl_error( ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorRGB)" );
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorRGB)");
return;
}
switch (sfactorA) {
+ case GL_SRC_COLOR:
+ case GL_ONE_MINUS_SRC_COLOR:
+ if (!ctx->Extensions.NV_blend_square) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(sfactorA)");
+ return;
+ }
+ /* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_DST_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
- ctx->Color.BlendSrcA = sfactorA;
break;
default:
- gl_error( ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(sfactorA)" );
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(sfactorA)");
return;
}
switch (dfactorA) {
+ case GL_DST_COLOR:
+ case GL_ONE_MINUS_DST_COLOR:
+ if (!ctx->Extensions.NV_blend_square) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorA)");
+ return;
+ }
+ /* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
- ctx->Color.BlendDstA = dfactorA;
break;
default:
- gl_error( ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorA)" );
+ _mesa_error( ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorA)" );
return;
}
- ctx->Color.BlendFunc = NULL;
- ctx->NewState |= NEW_RASTER_OPS;
+ if (ctx->Color.BlendSrcRGB == sfactorRGB &&
+ ctx->Color.BlendDstRGB == dfactorRGB &&
+ ctx->Color.BlendSrcA == sfactorA &&
+ ctx->Color.BlendDstA == dfactorA)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+
+ ctx->Color.BlendSrcRGB = sfactorRGB;
+ ctx->Color.BlendDstRGB = dfactorRGB;
+ ctx->Color.BlendSrcA = sfactorA;
+ ctx->Color.BlendDstA = dfactorA;
if (ctx->Driver.BlendFuncSeparate) {
(*ctx->Driver.BlendFuncSeparate)( ctx, sfactorRGB, dfactorRGB,
_mesa_BlendEquation( GLenum mode )
{
GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glBlendEquation");
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
fprintf(stderr, "glBlendEquation %s\n",
- gl_lookup_enum_by_nr(mode));
-
+ _mesa_lookup_enum_by_nr(mode));
switch (mode) {
+ case GL_FUNC_ADD_EXT:
+ break;
case GL_MIN_EXT:
case GL_MAX_EXT:
+ if (!ctx->Extensions.EXT_blend_minmax &&
+ !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
+ return;
+ }
+ break;
case GL_LOGIC_OP:
- case GL_FUNC_ADD_EXT:
+ if (!ctx->Extensions.EXT_blend_logic_op) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
+ return;
+ }
+ break;
case GL_FUNC_SUBTRACT_EXT:
case GL_FUNC_REVERSE_SUBTRACT_EXT:
- ctx->Color.BlendEquation = mode;
+ if (!ctx->Extensions.EXT_blend_subtract &&
+ !ctx->Extensions.ARB_imaging) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
+ return;
+ }
break;
default:
- gl_error( ctx, GL_INVALID_ENUM, "glBlendEquation" );
+ _mesa_error( ctx, GL_INVALID_ENUM, "glBlendEquation" );
return;
}
+ if (ctx->Color.BlendEquation == mode)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ ctx->Color.BlendEquation = mode;
+
/* This is needed to support 1.1's RGB logic ops AND
* 1.0's blending logicops.
*/
- if (mode==GL_LOGIC_OP && ctx->Color.BlendEnabled) {
- ctx->Color.ColorLogicOpEnabled = GL_TRUE;
- }
- else {
- ctx->Color.ColorLogicOpEnabled = GL_FALSE;
- }
+ ctx->Color.ColorLogicOpEnabled = (mode==GL_LOGIC_OP &&
+ ctx->Color.BlendEnabled);
- ctx->Color.BlendFunc = NULL;
- ctx->NewState |= NEW_RASTER_OPS;
-
if (ctx->Driver.BlendEquation)
- ctx->Driver.BlendEquation( ctx, mode );
+ (*ctx->Driver.BlendEquation)( ctx, mode );
}
void
_mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
{
+ GLfloat tmp[4];
GET_CURRENT_CONTEXT(ctx);
- ctx->Color.BlendColor[0] = CLAMP( red, 0.0F, 1.0F );
- ctx->Color.BlendColor[1] = CLAMP( green, 0.0F, 1.0F );
- ctx->Color.BlendColor[2] = CLAMP( blue, 0.0F, 1.0F );
- ctx->Color.BlendColor[3] = CLAMP( alpha, 0.0F, 1.0F );
-}
-
-#ifdef USE_MMX_ASM
-#define _BLENDAPI _ASMAPI
-#else
-#define _BLENDAPI
-#endif
-
-/*
- * Common transparency blending mode.
- */
-static void _BLENDAPI
-blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLubyte rgba[][4], CONST GLubyte dest[][4] )
-{
- 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);
- (void) ctx;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
- const GLint t = rgba[i][ACOMP]; /* t 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 */
- }
- else {
- const GLint s = CHAN_MAX - t;
- const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) >> 8;
- const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) >> 8;
- const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) >> 8;
- const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) >> 8;
- ASSERT(r <= CHAN_MAX);
- ASSERT(g <= CHAN_MAX);
- ASSERT(b <= CHAN_MAX);
- ASSERT(a <= CHAN_MAX);
- rgba[i][RCOMP] = (GLubyte) r;
- rgba[i][GCOMP] = (GLubyte) g;
- rgba[i][BCOMP] = (GLubyte) b;
- rgba[i][ACOMP] = (GLubyte) a;
- }
- }
- }
-}
-
-
-
-/*
- * Add src and dest.
- */
-static void _BLENDAPI
-blend_add( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLubyte rgba[][4], CONST GLubyte dest[][4] )
-{
- GLuint i;
- ASSERT(ctx->Color.BlendEquation==GL_FUNC_ADD_EXT);
- ASSERT(ctx->Color.BlendSrcRGB==GL_ONE);
- ASSERT(ctx->Color.BlendDstRGB==GL_ONE);
- (void) ctx;
-
- 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, CHAN_MAX );
- rgba[i][GCOMP] = (GLubyte) MIN2( g, CHAN_MAX );
- rgba[i][BCOMP] = (GLubyte) MIN2( b, CHAN_MAX );
- rgba[i][ACOMP] = (GLubyte) MIN2( a, CHAN_MAX );
- }
- }
-}
-
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+ tmp[0] = CLAMP( red, 0.0, 1.0 );
+ tmp[1] = CLAMP( green, 0.0, 1.0 );
+ tmp[2] = CLAMP( blue, 0.0, 1.0 );
+ tmp[3] = CLAMP( alpha, 0.0, 1.0 );
-/*
- * Blend min function (for GL_EXT_blend_minmax)
- */
-static void _BLENDAPI
-blend_min( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLubyte rgba[][4], CONST GLubyte dest[][4] )
-{
- GLuint i;
- ASSERT(ctx->Color.BlendEquation==GL_MIN_EXT);
- (void) ctx;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = (GLubyte) MIN2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = (GLubyte) MIN2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = (GLubyte) MIN2( rgba[i][BCOMP], dest[i][BCOMP] );
- rgba[i][ACOMP] = (GLubyte) MIN2( rgba[i][ACOMP], dest[i][ACOMP] );
- }
- }
-}
-
-
-
-/*
- * Blend max function (for GL_EXT_blend_minmax)
- */
-static void _BLENDAPI
-blend_max( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLubyte rgba[][4], CONST GLubyte dest[][4] )
-{
- GLuint i;
- ASSERT(ctx->Color.BlendEquation==GL_MAX_EXT);
- (void) ctx;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
- rgba[i][RCOMP] = (GLubyte) MAX2( rgba[i][RCOMP], dest[i][RCOMP] );
- rgba[i][GCOMP] = (GLubyte) MAX2( rgba[i][GCOMP], dest[i][GCOMP] );
- rgba[i][BCOMP] = (GLubyte) MAX2( rgba[i][BCOMP], dest[i][BCOMP] );
- rgba[i][ACOMP] = (GLubyte) MAX2( rgba[i][ACOMP], dest[i][ACOMP] );
- }
- }
-}
-
-
-
-/*
- * Modulate: result = src * dest
- */
-static void _BLENDAPI
-blend_modulate( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLubyte rgba[][4], CONST GLubyte dest[][4] )
-{
- GLuint i;
- (void) ctx;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLint r = (rgba[i][RCOMP] * dest[i][RCOMP]) >> 8;
- GLint g = (rgba[i][GCOMP] * dest[i][GCOMP]) >> 8;
- GLint b = (rgba[i][BCOMP] * dest[i][BCOMP]) >> 8;
- GLint a = (rgba[i][ACOMP] * dest[i][ACOMP]) >> 8;
- rgba[i][RCOMP] = (GLubyte) r;
- rgba[i][GCOMP] = (GLubyte) g;
- rgba[i][BCOMP] = (GLubyte) b;
- rgba[i][ACOMP] = (GLubyte) a;
- }
- }
-}
-
-
-
-/*
- * 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
- */
-static void _BLENDAPI
-blend_general( GLcontext *ctx, GLuint n, const GLubyte mask[],
- GLubyte rgba[][4], CONST GLubyte dest[][4] )
-{
- GLfloat rscale = 1.0F / CHAN_MAXF;
- GLfloat gscale = 1.0F / CHAN_MAXF;
- GLfloat bscale = 1.0F / CHAN_MAXF;
- GLfloat ascale = 1.0F / CHAN_MAXF;
- GLuint i;
-
- for (i=0;i<n;i++) {
- if (mask[i]) {
- GLint Rs, Gs, Bs, As; /* Source colors */
- GLint Rd, Gd, Bd, Ad; /* Dest colors */
- GLfloat sR, sG, sB, sA; /* Source scaling */
- GLfloat dR, dG, dB, dA; /* Dest scaling */
- GLfloat r, g, b, a;
-
- /* Source Color */
- Rs = rgba[i][RCOMP];
- Gs = rgba[i][GCOMP];
- Bs = rgba[i][BCOMP];
- As = rgba[i][ACOMP];
-
- /* Frame buffer color */
- Rd = dest[i][RCOMP];
- Gd = dest[i][GCOMP];
- Bd = dest[i][BCOMP];
- Ad = dest[i][ACOMP];
-
- /* Source RGB factor */
- switch (ctx->Color.BlendSrcRGB) {
- case GL_ZERO:
- sR = sG = sB = 0.0F;
- break;
- case GL_ONE:
- sR = sG = sB = 1.0F;
- break;
- case GL_DST_COLOR:
- sR = (GLfloat) Rd * rscale;
- sG = (GLfloat) Gd * gscale;
- sB = (GLfloat) Bd * bscale;
- 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;
- break;
- case GL_SRC_ALPHA:
- sR = sG = sB = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- sR = sG = sB = (GLfloat) 1.0F - (GLfloat) As * ascale;
- break;
- case GL_DST_ALPHA:
- sR = sG = sB = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- sR = sG = sB = 1.0F - (GLfloat) Ad * ascale;
- break;
- case GL_SRC_ALPHA_SATURATE:
- if (As < CHAN_MAX - Ad) {
- sR = sG = sB = (GLfloat) As * ascale;
- }
- else {
- sR = sG = sB = 1.0F - (GLfloat) Ad * ascale;
- }
- 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;
- default:
- /* this should never happen */
- gl_problem(ctx, "Bad blend source RGB factor in do_blend");
- return;
- }
-
- /* Source Alpha factor */
- switch (ctx->Color.BlendSrcA) {
- case GL_ZERO:
- sA = 0.0F;
- break;
- case GL_ONE:
- sA = 1.0F;
- break;
- case GL_DST_COLOR:
- sA = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_COLOR:
- sA = 1.0F - (GLfloat) Ad * ascale;
- break;
- case GL_SRC_ALPHA:
- sA = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- sA = (GLfloat) 1.0F - (GLfloat) As * ascale;
- break;
- case GL_DST_ALPHA:
- sA =(GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- sA = 1.0F - (GLfloat) Ad * ascale;
- 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;
- default:
- /* this should never happen */
- sA = 0.0F;
- gl_problem(ctx, "Bad blend source A factor in do_blend");
- }
-
- /* Dest RGB factor */
- switch (ctx->Color.BlendDstRGB) {
- case GL_ZERO:
- dR = dG = dB = 0.0F;
- break;
- case GL_ONE:
- dR = dG = dB = 1.0F;
- break;
- case GL_SRC_COLOR:
- dR = (GLfloat) Rs * rscale;
- dG = (GLfloat) Gs * gscale;
- dB = (GLfloat) Bs * bscale;
- 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;
- break;
- case GL_SRC_ALPHA:
- dR = dG = dB = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- dR = dG = dB = (GLfloat) 1.0F - (GLfloat) As * ascale;
- break;
- case GL_DST_ALPHA:
- dR = dG = dB = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- dR = dG = dB = 1.0F - (GLfloat) Ad * ascale;
- 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] * ascale;
- break;
- default:
- /* this should never happen */
- dR = dG = dB = 0.0F;
- gl_problem(ctx, "Bad blend dest RGB factor in do_blend");
- }
-
- /* Dest Alpha factor */
- switch (ctx->Color.BlendDstA) {
- case GL_ZERO:
- dA = 0.0F;
- break;
- case GL_ONE:
- dA = 1.0F;
- break;
- case GL_SRC_COLOR:
- dA = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_COLOR:
- dA = 1.0F - (GLfloat) As * ascale;
- break;
- case GL_SRC_ALPHA:
- dA = (GLfloat) As * ascale;
- break;
- case GL_ONE_MINUS_SRC_ALPHA:
- dA = (GLfloat) 1.0F - (GLfloat) As * ascale;
- break;
- case GL_DST_ALPHA:
- dA = (GLfloat) Ad * ascale;
- break;
- case GL_ONE_MINUS_DST_ALPHA:
- dA = 1.0F - (GLfloat) Ad * ascale;
- 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] * ascale;
- break;
- default:
- /* this should never happen */
- dA = 0.0F;
- gl_problem(ctx, "Bad blend dest A factor in do_blend");
- 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 (ctx->Color.BlendEquation==GL_FUNC_ADD_EXT) {
- 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) {
- 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) {
- r = Rd * dR - Rs * sR;
- g = Gd * dG - Gs * sG;
- b = Bd * dB - Bs * sB;
- a = Ad * dA - As * sA;
- }
- else {
- /* should never get here */
- r = g = b = a = 0.0F; /* silence uninitialized var warning */
- gl_problem(ctx, "unexpected BlendEquation in blend_general()");
- }
-
- /* final clamping */
- rgba[i][RCOMP] = (GLubyte) (GLint) CLAMP( r, 0.0F, CHAN_MAXF );
- rgba[i][GCOMP] = (GLubyte) (GLint) CLAMP( g, 0.0F, CHAN_MAXF );
- rgba[i][BCOMP] = (GLubyte) (GLint) CLAMP( b, 0.0F, CHAN_MAXF );
- rgba[i][ACOMP] = (GLubyte) (GLint) CLAMP( a, 0.0F, CHAN_MAXF );
- }
- }
-}
-
-
-
-#if defined(USE_MMX_ASM)
-#include "X86/mmx.h"
-#include "X86/common_x86asm.h"
-#endif
-
-
-/*
- * Analyze current blending parameters to pick fastest blending function.
- * Result: the ctx->Color.BlendFunc pointer is updated.
- */
-static void set_blend_function( GLcontext *ctx )
-{
- 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 defined(USE_MMX_ASM)
- /* Hmm. A table here would have 12^4 == way too many entries.
- * Provide a hook for MMX instead.
- */
- if (gl_x86_cpu_features & GL_CPU_MMX) {
- gl_mmx_set_blend_function (ctx);
- }
- else
-#endif
- if (srcRGB != srcA || dstRGB != dstA) {
- ctx->Color.BlendFunc = blend_general;
- }
- else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_SRC_ALPHA
- && dstRGB==GL_ONE_MINUS_SRC_ALPHA) {
- ctx->Color.BlendFunc = blend_transparency;
- }
- else if (eq==GL_FUNC_ADD_EXT && srcRGB==GL_ONE && dstRGB==GL_ONE) {
- ctx->Color.BlendFunc = blend_add;
- }
- 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))) {
- ctx->Color.BlendFunc = blend_modulate;
- }
- else if (eq==GL_MIN_EXT) {
- ctx->Color.BlendFunc = blend_min;
- }
- else if (eq==GL_MAX_EXT) {
- ctx->Color.BlendFunc = blend_max;
- }
- else {
- ctx->Color.BlendFunc = blend_general;
- }
-}
-
-
-
-/*
- * Apply the blending operator to a span of pixels.
- * Input: n - number of pixels in span
- * x, y - location of leftmost pixel in span in window coords.
- * mask - boolean mask indicating which pixels to blend.
- * In/Out: rgba - pixel values
- */
-void
-_mesa_blend_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
- GLubyte rgba[][4], const GLubyte mask[] )
-{
- GLubyte dest[MAX_WIDTH][4];
-
- /* Check if device driver can do the work */
- if (ctx->Color.BlendEquation==GL_LOGIC_OP && !ctx->Color.SWLogicOpEnabled) {
+ if (TEST_EQ_4V(tmp, ctx->Color.BlendColor))
return;
- }
-
- /* Read span of current frame buffer pixels */
- gl_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
-
- if (!ctx->Color.BlendFunc)
- set_blend_function(ctx);
-
- (*ctx->Color.BlendFunc)( ctx, n, mask, rgba, (const GLubyte (*)[4])dest );
-}
-
-
-
-
-
-/*
- * Apply the blending operator to an array of pixels.
- * Input: n - number of pixels in span
- * x, y - array of pixel locations
- * mask - boolean mask indicating which pixels to blend.
- * In/Out: rgba - pixel values
- */
-void
-_mesa_blend_pixels( GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- GLubyte rgba[][4], const GLubyte mask[] )
-{
- GLubyte dest[PB_SIZE][4];
-
- /* Check if device driver can do the work */
- if (ctx->Color.BlendEquation==GL_LOGIC_OP && !ctx->Color.SWLogicOpEnabled) {
- return;
- }
-
- /* Read pixels from current color buffer */
- (*ctx->Driver.ReadRGBAPixels)( ctx, n, x, y, dest, mask );
- if (ctx->RasterMask & ALPHABUF_BIT) {
- _mesa_read_alpha_pixels( ctx, n, x, y, dest, mask );
- }
- if (!ctx->Color.BlendFunc)
- set_blend_function(ctx);
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ COPY_4FV( ctx->Color.BlendColor, tmp );
- (*ctx->Color.BlendFunc)( ctx, n, mask, rgba, (const GLubyte (*)[4])dest );
+ if (ctx->Driver.BlendColor)
+ (*ctx->Driver.BlendColor)(ctx, tmp);
}
projects / mesa.git / blobdiff