/* $Id: blend.c,v 1.27 2000/12/26 05:09:27 keithw Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifdef PC_HEADER
#include "all.h"
#else
#include "glheader.h"
#include "blend.h"
#include "context.h"
#include "enums.h"
#include "macros.h"
#include "mtypes.h"
#endif
void
_mesa_BlendFunc( GLenum sfactor, GLenum dfactor )
{
GET_CURRENT_CONTEXT(ctx);
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));
switch (sfactor) {
case GL_SRC_COLOR:
case GL_ONE_MINUS_SRC_COLOR:
if (!ctx->Extensions.NV_blend_square) {
gl_error( ctx, GL_INVALID_ENUM, "glBlendFunc(sfactor)" );
return;
}
/* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_DST_COLOR:
case GL_ONE_MINUS_DST_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_SRC_ALPHA_SATURATE:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
break;
default:
gl_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) {
gl_error( ctx, GL_INVALID_ENUM, "glBlendFunc(dfactor)" );
return;
}
/* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_SRC_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glBlendFunc(dfactor)" );
return;
}
if (ctx->Color.BlendDstRGB == dfactor &&
ctx->Color.BlendSrcRGB == sfactor &&
ctx->Color.BlendDstA == dfactor &&
ctx->Color.BlendSrcA == sfactor)
return;
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 );
}
/* GL_EXT_blend_func_separate */
void
_mesa_BlendFuncSeparateEXT( GLenum sfactorRGB, GLenum dfactorRGB,
GLenum sfactorA, GLenum dfactorA )
{
GET_CURRENT_CONTEXT(ctx);
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));
switch (sfactorRGB) {
case GL_SRC_COLOR:
case GL_ONE_MINUS_SRC_COLOR:
if (!ctx->Extensions.NV_blend_square) {
gl_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(sfactorRGB)");
return;
}
/* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_DST_COLOR:
case GL_ONE_MINUS_DST_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_SRC_ALPHA_SATURATE:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
break;
default:
gl_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) {
gl_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorRGB)");
return;
}
/* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_SRC_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
break;
default:
gl_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) {
gl_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(sfactorA)");
return;
}
/* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_DST_COLOR:
case GL_ONE_MINUS_DST_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_SRC_ALPHA_SATURATE:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
break;
default:
gl_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) {
gl_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorA)");
return;
}
/* fall-through */
case GL_ZERO:
case GL_ONE:
case GL_SRC_COLOR:
case GL_ONE_MINUS_SRC_COLOR:
case GL_SRC_ALPHA:
case GL_ONE_MINUS_SRC_ALPHA:
case GL_DST_ALPHA:
case GL_ONE_MINUS_DST_ALPHA:
case GL_CONSTANT_COLOR:
case GL_ONE_MINUS_CONSTANT_COLOR:
case GL_CONSTANT_ALPHA:
case GL_ONE_MINUS_CONSTANT_ALPHA:
break;
default:
gl_error( ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorA)" );
return;
}
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,
sfactorA, dfactorA );
}
}
/* This is really an extension function! */
void
_mesa_BlendEquation( GLenum mode )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
fprintf(stderr, "glBlendEquation %s\n",
gl_lookup_enum_by_nr(mode));
switch (mode) {
case GL_MIN_EXT:
case GL_MAX_EXT:
case GL_FUNC_ADD_EXT:
if (!ctx->Extensions.EXT_blend_minmax) {
gl_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
return;
}
case GL_LOGIC_OP:
break;
case GL_FUNC_SUBTRACT_EXT:
case GL_FUNC_REVERSE_SUBTRACT_EXT:
if (!ctx->Extensions.EXT_blend_subtract) {
gl_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
return;
}
break;
default:
gl_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.
*/
ctx->Color.ColorLogicOpEnabled = (mode==GL_LOGIC_OP &&
ctx->Color.BlendEnabled);
if (ctx->Driver.BlendEquation)
ctx->Driver.BlendEquation( ctx, mode );
}
void
_mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
{
GLfloat tmp[4];
GET_CURRENT_CONTEXT(ctx);
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 );
if (TEST_EQ_4V(tmp, ctx->Color.BlendColor))
return;
FLUSH_VERTICES(ctx, _NEW_COLOR);
COPY_4FV( ctx->Color.BlendColor, tmp );
}