-/* $Id: blend.c,v 1.28 2001/02/26 22:07:03 brianp Exp $ */
+/**
+ * \file blend.c
+ * Blending operations.
+ */
/*
* Mesa 3-D graphics library
- * Version: 3.5
+ * Version: 6.5.1
*
- * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2006 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"),
*/
-#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
+
+/**
+ * Check if given blend source factor is legal.
+ * \return GL_TRUE if legal, GL_FALSE otherwise.
+ */
+static GLboolean
+legal_src_factor(const struct gl_context *ctx, GLenum factor)
+{
+ switch (factor) {
+ case GL_SRC_COLOR:
+ case GL_ONE_MINUS_SRC_COLOR:
+ return ctx->Extensions.NV_blend_square;
+ 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:
+ return GL_TRUE;
+ case GL_CONSTANT_COLOR:
+ case GL_ONE_MINUS_CONSTANT_COLOR:
+ case GL_CONSTANT_ALPHA:
+ case GL_ONE_MINUS_CONSTANT_ALPHA:
+ return _mesa_is_desktop_gl(ctx) || ctx->API == API_OPENGLES2;
+ case GL_SRC1_COLOR:
+ case GL_SRC1_ALPHA:
+ case GL_ONE_MINUS_SRC1_COLOR:
+ case GL_ONE_MINUS_SRC1_ALPHA:
+ return _mesa_is_desktop_gl(ctx)
+ && ctx->Extensions.ARB_blend_func_extended;
+ default:
+ return GL_FALSE;
+ }
+}
+
+
+/**
+ * Check if given blend destination factor is legal.
+ * \return GL_TRUE if legal, GL_FALSE otherwise.
+ */
+static GLboolean
+legal_dst_factor(const struct gl_context *ctx, GLenum factor)
+{
+ switch (factor) {
+ case GL_DST_COLOR:
+ case GL_ONE_MINUS_DST_COLOR:
+ return ctx->Extensions.NV_blend_square;
+ 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:
+ return GL_TRUE;
+ case GL_CONSTANT_COLOR:
+ case GL_ONE_MINUS_CONSTANT_COLOR:
+ case GL_CONSTANT_ALPHA:
+ case GL_ONE_MINUS_CONSTANT_ALPHA:
+ return _mesa_is_desktop_gl(ctx) || ctx->API == API_OPENGLES2;
+ case GL_SRC_ALPHA_SATURATE:
+ return (_mesa_is_desktop_gl(ctx)
+ && ctx->Extensions.ARB_blend_func_extended)
+ || _mesa_is_gles3(ctx);
+ case GL_SRC1_COLOR:
+ case GL_SRC1_ALPHA:
+ case GL_ONE_MINUS_SRC1_COLOR:
+ case GL_ONE_MINUS_SRC1_ALPHA:
+ return _mesa_is_desktop_gl(ctx)
+ && ctx->Extensions.ARB_blend_func_extended;
+ default:
+ return GL_FALSE;
+ }
+}
+
+
+/**
+ * Check if src/dest RGB/A blend factors are legal. If not generate
+ * a GL error.
+ * \return GL_TRUE if factors are legal, GL_FALSE otherwise.
+ */
+static GLboolean
+validate_blend_factors(struct gl_context *ctx, const char *func,
+ GLenum sfactorRGB, GLenum dfactorRGB,
+ GLenum sfactorA, GLenum dfactorA)
+{
+ if (!legal_src_factor(ctx, sfactorRGB)) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "%s(sfactorRGB = %s)", func,
+ _mesa_lookup_enum_by_nr(sfactorRGB));
+ return GL_FALSE;
+ }
+
+ if (!legal_dst_factor(ctx, dfactorRGB)) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "%s(dfactorRGB = %s)", func,
+ _mesa_lookup_enum_by_nr(dfactorRGB));
+ return GL_FALSE;
+ }
+
+ if (sfactorA != sfactorRGB && !legal_src_factor(ctx, sfactorA)) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "%s(sfactorA = %s)", func,
+ _mesa_lookup_enum_by_nr(sfactorA));
+ return GL_FALSE;
+ }
+
+ if (dfactorA != dfactorRGB && !legal_dst_factor(ctx, dfactorA)) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "%s(dfactorA = %s)", func,
+ _mesa_lookup_enum_by_nr(dfactorA));
+ return GL_FALSE;
+ }
+
+ return GL_TRUE;
+}
+
+
+/**
+ * Specify the blending operation.
+ *
+ * \param sfactor source factor operator.
+ * \param dfactor destination factor operator.
+ *
+ * \sa glBlendFunc, glBlendFuncSeparateEXT
+ */
+void GLAPIENTRY
_mesa_BlendFunc( GLenum sfactor, GLenum dfactor )
{
-
+ _mesa_BlendFuncSeparate(sfactor, dfactor, sfactor, dfactor);
+}
+
+static GLboolean
+blend_factor_is_dual_src(GLenum factor)
+{
+ return (factor == GL_SRC1_COLOR ||
+ factor == GL_SRC1_ALPHA ||
+ factor == GL_ONE_MINUS_SRC1_COLOR ||
+ factor == GL_ONE_MINUS_SRC1_ALPHA);
+}
+
+static void
+update_uses_dual_src(struct gl_context *ctx, int buf)
+{
+ ctx->Color.Blend[buf]._UsesDualSrc =
+ (blend_factor_is_dual_src(ctx->Color.Blend[buf].SrcRGB) ||
+ blend_factor_is_dual_src(ctx->Color.Blend[buf].DstRGB) ||
+ blend_factor_is_dual_src(ctx->Color.Blend[buf].SrcA) ||
+ blend_factor_is_dual_src(ctx->Color.Blend[buf].DstA));
+}
+
+/**
+ * Set the separate blend source/dest factors for all draw buffers.
+ *
+ * \param sfactorRGB RGB source factor operator.
+ * \param dfactorRGB RGB destination factor operator.
+ * \param sfactorA alpha source factor operator.
+ * \param dfactorA alpha destination factor operator.
+ */
+void GLAPIENTRY
+_mesa_BlendFuncSeparate( GLenum sfactorRGB, GLenum dfactorRGB,
+ GLenum sfactorA, GLenum dfactorA )
+{
+ GLuint buf, numBuffers;
+ GLboolean changed;
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;
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "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));
+
+ if (!validate_blend_factors(ctx, "glBlendFuncSeparate",
+ sfactorRGB, dfactorRGB,
+ sfactorA, dfactorA)) {
+ 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:
+ numBuffers = ctx->Extensions.ARB_draw_buffers_blend
+ ? ctx->Const.MaxDrawBuffers : 1;
+
+ changed = GL_FALSE;
+ for (buf = 0; buf < numBuffers; buf++) {
+ if (ctx->Color.Blend[buf].SrcRGB != sfactorRGB ||
+ ctx->Color.Blend[buf].DstRGB != dfactorRGB ||
+ ctx->Color.Blend[buf].SrcA != sfactorA ||
+ ctx->Color.Blend[buf].DstA != dfactorA) {
+ changed = GL_TRUE;
break;
- default:
- gl_error( ctx, GL_INVALID_ENUM, "glBlendFunc(dfactor)" );
- return;
+ }
+ }
+ if (!changed)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+
+ for (buf = 0; buf < numBuffers; buf++) {
+ ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
+ ctx->Color.Blend[buf].DstRGB = dfactorRGB;
+ ctx->Color.Blend[buf].SrcA = sfactorA;
+ ctx->Color.Blend[buf].DstA = dfactorA;
+ update_uses_dual_src(ctx, buf);
+ }
+ ctx->Color._BlendFuncPerBuffer = GL_FALSE;
+
+ if (ctx->Driver.BlendFuncSeparate) {
+ ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB,
+ sfactorA, dfactorA);
+ }
+}
+
+
+/**
+ * Set blend source/dest factors for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendFunciARB(GLuint buf, GLenum sfactor, GLenum dfactor)
+{
+ _mesa_BlendFuncSeparateiARB(buf, sfactor, dfactor, sfactor, dfactor);
+}
+
+
+/**
+ * Set separate blend source/dest factors for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendFuncSeparateiARB(GLuint buf, GLenum sfactorRGB, GLenum dfactorRGB,
+ GLenum sfactorA, GLenum dfactorA)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (!ctx->Extensions.ARB_draw_buffers_blend) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glBlendFunc[Separate]i()");
+ return;
}
- if (ctx->Color.BlendDstRGB == dfactor &&
- ctx->Color.BlendSrcRGB == sfactor &&
- ctx->Color.BlendDstA == dfactor &&
- ctx->Color.BlendSrcA == sfactor)
+ if (buf >= ctx->Const.MaxDrawBuffers) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
+ buf);
return;
+ }
+
+ if (!validate_blend_factors(ctx, "glBlendFuncSeparatei",
+ sfactorRGB, dfactorRGB,
+ sfactorA, dfactorA)) {
+ return;
+ }
+
+ if (ctx->Color.Blend[buf].SrcRGB == sfactorRGB &&
+ ctx->Color.Blend[buf].DstRGB == dfactorRGB &&
+ ctx->Color.Blend[buf].SrcA == sfactorA &&
+ ctx->Color.Blend[buf].DstA == dfactorA)
+ return; /* no change */
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 );
+ ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
+ ctx->Color.Blend[buf].DstRGB = dfactorRGB;
+ ctx->Color.Blend[buf].SrcA = sfactorA;
+ ctx->Color.Blend[buf].DstA = dfactorA;
+ update_uses_dual_src(ctx, buf);
+ ctx->Color._BlendFuncPerBuffer = GL_TRUE;
+
+ if (ctx->Driver.BlendFuncSeparatei) {
+ ctx->Driver.BlendFuncSeparatei(ctx, buf, sfactorRGB, dfactorRGB,
+ sfactorA, dfactorA);
+ }
}
-/* GL_EXT_blend_func_separate */
-void
-_mesa_BlendFuncSeparateEXT( GLenum sfactorRGB, GLenum dfactorRGB,
- GLenum sfactorA, GLenum dfactorA )
+/**
+ * Check if given blend equation is legal.
+ * \return GL_TRUE if legal, GL_FALSE otherwise.
+ */
+static GLboolean
+legal_blend_equation(const struct gl_context *ctx, GLenum mode)
+{
+ switch (mode) {
+ case GL_FUNC_ADD:
+ case GL_FUNC_SUBTRACT:
+ case GL_FUNC_REVERSE_SUBTRACT:
+ return GL_TRUE;
+ case GL_MIN:
+ case GL_MAX:
+ return ctx->Extensions.EXT_blend_minmax;
+ default:
+ return GL_FALSE;
+ }
+}
+
+
+/* This is really an extension function! */
+void GLAPIENTRY
+_mesa_BlendEquation( GLenum mode )
{
+ GLuint buf, numBuffers;
+ GLboolean changed;
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;
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glBlendEquation(%s)\n",
+ _mesa_lookup_enum_by_nr(mode));
+
+ if (!legal_blend_equation(ctx, mode)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
+ 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:
+ numBuffers = ctx->Extensions.ARB_draw_buffers_blend
+ ? ctx->Const.MaxDrawBuffers : 1;
+
+ changed = GL_FALSE;
+ for (buf = 0; buf < numBuffers; buf++) {
+ if (ctx->Color.Blend[buf].EquationRGB != mode ||
+ ctx->Color.Blend[buf].EquationA != mode) {
+ changed = GL_TRUE;
break;
- default:
- gl_error(ctx, GL_INVALID_ENUM, "glBlendFuncSeparate(dfactorRGB)");
- return;
+ }
}
+ if (!changed)
+ 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;
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ for (buf = 0; buf < numBuffers; buf++) {
+ ctx->Color.Blend[buf].EquationRGB = mode;
+ ctx->Color.Blend[buf].EquationA = mode;
}
+ ctx->Color._BlendEquationPerBuffer = GL_FALSE;
- 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->Driver.BlendEquationSeparate)
+ (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode );
+}
+
+
+/**
+ * Set blend equation for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendEquationiARB(GLuint buf, GLenum mode)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glBlendEquationi(%u, %s)\n",
+ buf, _mesa_lookup_enum_by_nr(mode));
+
+ if (buf >= ctx->Const.MaxDrawBuffers) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
+ buf);
+ return;
}
- if (ctx->Color.BlendSrcRGB == sfactorRGB &&
- ctx->Color.BlendDstRGB == dfactorRGB &&
- ctx->Color.BlendSrcA == sfactorA &&
- ctx->Color.BlendDstA == dfactorA)
+ if (!legal_blend_equation(ctx, mode)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationi");
return;
+ }
+
+ if (ctx->Color.Blend[buf].EquationRGB == mode &&
+ ctx->Color.Blend[buf].EquationA == mode)
+ return; /* no change */
FLUSH_VERTICES(ctx, _NEW_COLOR);
+ ctx->Color.Blend[buf].EquationRGB = mode;
+ ctx->Color.Blend[buf].EquationA = mode;
+ ctx->Color._BlendEquationPerBuffer = GL_TRUE;
- ctx->Color.BlendSrcRGB = sfactorRGB;
- ctx->Color.BlendDstRGB = dfactorRGB;
- ctx->Color.BlendSrcA = sfactorA;
- ctx->Color.BlendDstA = dfactorA;
+ if (ctx->Driver.BlendEquationSeparatei)
+ ctx->Driver.BlendEquationSeparatei(ctx, buf, mode, mode);
+}
- if (ctx->Driver.BlendFuncSeparate) {
- (*ctx->Driver.BlendFuncSeparate)( ctx, sfactorRGB, dfactorRGB,
- sfactorA, dfactorA );
+
+void GLAPIENTRY
+_mesa_BlendEquationSeparate( GLenum modeRGB, GLenum modeA )
+{
+ GLuint buf, numBuffers;
+ GLboolean changed;
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glBlendEquationSeparateEXT(%s %s)\n",
+ _mesa_lookup_enum_by_nr(modeRGB),
+ _mesa_lookup_enum_by_nr(modeA));
+
+ if ( (modeRGB != modeA) && !ctx->Extensions.EXT_blend_equation_separate ) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glBlendEquationSeparateEXT not supported by driver");
+ return;
+ }
+
+ if (!legal_blend_equation(ctx, modeRGB)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)");
+ return;
+ }
+
+ if (!legal_blend_equation(ctx, modeA)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeA)");
+ return;
+ }
+
+ numBuffers = ctx->Extensions.ARB_draw_buffers_blend
+ ? ctx->Const.MaxDrawBuffers : 1;
+
+ changed = GL_FALSE;
+ for (buf = 0; buf < numBuffers; buf++) {
+ if (ctx->Color.Blend[buf].EquationRGB != modeRGB ||
+ ctx->Color.Blend[buf].EquationA != modeA) {
+ changed = GL_TRUE;
+ break;
+ }
}
+ if (!changed)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ for (buf = 0; buf < numBuffers; buf++) {
+ ctx->Color.Blend[buf].EquationRGB = modeRGB;
+ ctx->Color.Blend[buf].EquationA = modeA;
+ }
+ ctx->Color._BlendEquationPerBuffer = GL_FALSE;
+
+ if (ctx->Driver.BlendEquationSeparate)
+ ctx->Driver.BlendEquationSeparate(ctx, modeRGB, modeA);
}
+/**
+ * Set separate blend equations for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendEquationSeparateiARB(GLuint buf, GLenum modeRGB, GLenum modeA)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
-/* This is really an extension function! */
-void
-_mesa_BlendEquation( GLenum mode )
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glBlendEquationSeparatei(%u, %s %s)\n", buf,
+ _mesa_lookup_enum_by_nr(modeRGB),
+ _mesa_lookup_enum_by_nr(modeA));
+
+ if (buf >= ctx->Const.MaxDrawBuffers) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glBlendEquationSeparatei(buffer=%u)",
+ buf);
+ return;
+ }
+
+ if (!legal_blend_equation(ctx, modeRGB)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)");
+ return;
+ }
+
+ if (!legal_blend_equation(ctx, modeA)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeA)");
+ return;
+ }
+
+ if (ctx->Color.Blend[buf].EquationRGB == modeRGB &&
+ ctx->Color.Blend[buf].EquationA == modeA)
+ return; /* no change */
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ ctx->Color.Blend[buf].EquationRGB = modeRGB;
+ ctx->Color.Blend[buf].EquationA = modeA;
+ ctx->Color._BlendEquationPerBuffer = GL_TRUE;
+
+ if (ctx->Driver.BlendEquationSeparatei)
+ ctx->Driver.BlendEquationSeparatei(ctx, buf, modeRGB, modeA);
+}
+
+
+/**
+ * Set the blending color.
+ *
+ * \param red red color component.
+ * \param green green color component.
+ * \param blue blue color component.
+ * \param alpha alpha color component.
+ *
+ * \sa glBlendColor().
+ *
+ * Clamps the parameters and updates gl_colorbuffer_attrib::BlendColor. On a
+ * change, flushes the vertices and notifies the driver via
+ * dd_function_table::BlendColor callback.
+ */
+void GLAPIENTRY
+_mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
{
+ GLfloat tmp[4];
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));
+ tmp[0] = red;
+ tmp[1] = green;
+ tmp[2] = blue;
+ tmp[3] = alpha;
- 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) {
- gl_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
- return;
- }
- break;
- case GL_LOGIC_OP:
- if (!ctx->Extensions.EXT_blend_logic_op) {
- gl_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
- return;
- }
- break;
- case GL_FUNC_SUBTRACT_EXT:
- case GL_FUNC_REVERSE_SUBTRACT_EXT:
- if (!ctx->Extensions.EXT_blend_subtract &&
- !ctx->Extensions.ARB_imaging) {
- gl_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
- return;
- }
- break;
+ if (TEST_EQ_4V(tmp, ctx->Color.BlendColorUnclamped))
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ COPY_4FV( ctx->Color.BlendColorUnclamped, tmp );
+
+ ctx->Color.BlendColor[0] = CLAMP(tmp[0], 0.0F, 1.0F);
+ ctx->Color.BlendColor[1] = CLAMP(tmp[1], 0.0F, 1.0F);
+ ctx->Color.BlendColor[2] = CLAMP(tmp[2], 0.0F, 1.0F);
+ ctx->Color.BlendColor[3] = CLAMP(tmp[3], 0.0F, 1.0F);
+
+ if (ctx->Driver.BlendColor)
+ (*ctx->Driver.BlendColor)(ctx, ctx->Color.BlendColor);
+}
+
+
+/**
+ * Specify the alpha test function.
+ *
+ * \param func alpha comparison function.
+ * \param ref reference value.
+ *
+ * Verifies the parameters and updates gl_colorbuffer_attrib.
+ * On a change, flushes the vertices and notifies the driver via
+ * dd_function_table::AlphaFunc callback.
+ */
+void GLAPIENTRY
+_mesa_AlphaFunc( GLenum func, GLclampf ref )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glAlphaFunc(%s, %f)\n",
+ _mesa_lookup_enum_by_nr(func), ref);
+
+ switch (func) {
+ case GL_NEVER:
+ case GL_LESS:
+ case GL_EQUAL:
+ case GL_LEQUAL:
+ case GL_GREATER:
+ case GL_NOTEQUAL:
+ case GL_GEQUAL:
+ case GL_ALWAYS:
+ if (ctx->Color.AlphaFunc == func && ctx->Color.AlphaRefUnclamped == ref)
+ return; /* no change */
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ ctx->Color.AlphaFunc = func;
+ ctx->Color.AlphaRefUnclamped = ref;
+ ctx->Color.AlphaRef = CLAMP(ref, 0.0F, 1.0F);
+
+ if (ctx->Driver.AlphaFunc)
+ ctx->Driver.AlphaFunc(ctx, func, ctx->Color.AlphaRef);
+ return;
+
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glAlphaFunc(func)" );
+ return;
+ }
+}
+
+
+/**
+ * Specify a logic pixel operation for color index rendering.
+ *
+ * \param opcode operation.
+ *
+ * Verifies that \p opcode is a valid enum and updates
+gl_colorbuffer_attrib::LogicOp.
+ * On a change, flushes the vertices and notifies the driver via the
+ * dd_function_table::LogicOpcode callback.
+ */
+void GLAPIENTRY
+_mesa_LogicOp( GLenum opcode )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glLogicOp(%s)\n", _mesa_lookup_enum_by_nr(opcode));
+
+ switch (opcode) {
+ case GL_CLEAR:
+ case GL_SET:
+ case GL_COPY:
+ case GL_COPY_INVERTED:
+ case GL_NOOP:
+ case GL_INVERT:
+ case GL_AND:
+ case GL_NAND:
+ case GL_OR:
+ case GL_NOR:
+ case GL_XOR:
+ case GL_EQUIV:
+ case GL_AND_REVERSE:
+ case GL_AND_INVERTED:
+ case GL_OR_REVERSE:
+ case GL_OR_INVERTED:
+ break;
default:
- gl_error( ctx, GL_INVALID_ENUM, "glBlendEquation" );
- return;
+ _mesa_error( ctx, GL_INVALID_ENUM, "glLogicOp" );
+ return;
}
- if (ctx->Color.BlendEquation == mode)
+ if (ctx->Color.LogicOp == opcode)
return;
-
+
FLUSH_VERTICES(ctx, _NEW_COLOR);
- ctx->Color.BlendEquation = mode;
+ ctx->Color.LogicOp = opcode;
- /* 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.LogicOpcode)
+ ctx->Driver.LogicOpcode( ctx, opcode );
+}
- if (ctx->Driver.BlendEquation)
- ctx->Driver.BlendEquation( ctx, mode );
+
+void GLAPIENTRY
+_mesa_IndexMask( GLuint mask )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (ctx->Color.IndexMask == mask)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ ctx->Color.IndexMask = mask;
}
+/**
+ * Enable or disable writing of frame buffer color components.
+ *
+ * \param red whether to mask writing of the red color component.
+ * \param green whether to mask writing of the green color component.
+ * \param blue whether to mask writing of the blue color component.
+ * \param alpha whether to mask writing of the alpha color component.
+ *
+ * \sa glColorMask().
+ *
+ * Sets the appropriate value of gl_colorbuffer_attrib::ColorMask. On a
+ * change, flushes the vertices and notifies the driver via the
+ * dd_function_table::ColorMask callback.
+ */
+void GLAPIENTRY
+_mesa_ColorMask( GLboolean red, GLboolean green,
+ GLboolean blue, GLboolean alpha )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ GLubyte tmp[4];
+ GLuint i;
+ GLboolean flushed;
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glColorMask(%d, %d, %d, %d)\n",
+ red, green, blue, alpha);
+
+ /* Shouldn't have any information about channel depth in core mesa
+ * -- should probably store these as the native booleans:
+ */
+ tmp[RCOMP] = red ? 0xff : 0x0;
+ tmp[GCOMP] = green ? 0xff : 0x0;
+ tmp[BCOMP] = blue ? 0xff : 0x0;
+ tmp[ACOMP] = alpha ? 0xff : 0x0;
+
+ flushed = GL_FALSE;
+ for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
+ if (!TEST_EQ_4V(tmp, ctx->Color.ColorMask[i])) {
+ if (!flushed) {
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ }
+ flushed = GL_TRUE;
+ COPY_4UBV(ctx->Color.ColorMask[i], tmp);
+ }
+ }
-void
-_mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
+ if (ctx->Driver.ColorMask)
+ ctx->Driver.ColorMask( ctx, red, green, blue, alpha );
+}
+
+
+/**
+ * For GL_EXT_draw_buffers2 and GL3
+ */
+void GLAPIENTRY
+_mesa_ColorMaski( GLuint buf, GLboolean red, GLboolean green,
+ GLboolean blue, GLboolean alpha )
{
- GLfloat tmp[4];
+ GLubyte 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 (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glColorMaskIndexed %u %d %d %d %d\n",
+ buf, red, green, blue, alpha);
+
+ if (buf >= ctx->Const.MaxDrawBuffers) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glColorMaskIndexed(buf=%u)", buf);
+ return;
+ }
- if (TEST_EQ_4V(tmp, ctx->Color.BlendColor))
+ /* Shouldn't have any information about channel depth in core mesa
+ * -- should probably store these as the native booleans:
+ */
+ tmp[RCOMP] = red ? 0xff : 0x0;
+ tmp[GCOMP] = green ? 0xff : 0x0;
+ tmp[BCOMP] = blue ? 0xff : 0x0;
+ tmp[ACOMP] = alpha ? 0xff : 0x0;
+
+ if (TEST_EQ_4V(tmp, ctx->Color.ColorMask[buf]))
return;
FLUSH_VERTICES(ctx, _NEW_COLOR);
- COPY_4FV( ctx->Color.BlendColor, tmp );
+ COPY_4UBV(ctx->Color.ColorMask[buf], tmp);
+
+ if (ctx->Driver.ColorMaskIndexed)
+ ctx->Driver.ColorMaskIndexed(ctx, buf, red, green, blue, alpha);
+}
+
+
+void GLAPIENTRY
+_mesa_ClampColor(GLenum target, GLenum clamp)
+{
+ GET_CURRENT_CONTEXT(ctx);
+
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (clamp != GL_TRUE && clamp != GL_FALSE && clamp != GL_FIXED_ONLY_ARB) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(clamp)");
+ return;
+ }
+
+ switch (target) {
+ case GL_CLAMP_VERTEX_COLOR_ARB:
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ ctx->Light.ClampVertexColor = clamp;
+ break;
+ case GL_CLAMP_FRAGMENT_COLOR_ARB:
+ FLUSH_VERTICES(ctx, _NEW_FRAG_CLAMP);
+ ctx->Color.ClampFragmentColor = clamp;
+ break;
+ case GL_CLAMP_READ_COLOR_ARB:
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ ctx->Color.ClampReadColor = clamp;
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(target)");
+ return;
+ }
+}
+
+
+
+
+/**********************************************************************/
+/** \name Initialization */
+/*@{*/
+
+/**
+ * Initialization of the context's Color attribute group.
+ *
+ * \param ctx GL context.
+ *
+ * Initializes the related fields in the context color attribute group,
+ * __struct gl_contextRec::Color.
+ */
+void _mesa_init_color( struct gl_context * ctx )
+{
+ GLuint i;
+
+ /* Color buffer group */
+ ctx->Color.IndexMask = ~0u;
+ memset(ctx->Color.ColorMask, 0xff, sizeof(ctx->Color.ColorMask));
+ ctx->Color.ClearIndex = 0;
+ ASSIGN_4V( ctx->Color.ClearColor.f, 0, 0, 0, 0 );
+ ctx->Color.AlphaEnabled = GL_FALSE;
+ ctx->Color.AlphaFunc = GL_ALWAYS;
+ ctx->Color.AlphaRef = 0;
+ ctx->Color.BlendEnabled = 0x0;
+ for (i = 0; i < Elements(ctx->Color.Blend); i++) {
+ ctx->Color.Blend[i].SrcRGB = GL_ONE;
+ ctx->Color.Blend[i].DstRGB = GL_ZERO;
+ ctx->Color.Blend[i].SrcA = GL_ONE;
+ ctx->Color.Blend[i].DstA = GL_ZERO;
+ ctx->Color.Blend[i].EquationRGB = GL_FUNC_ADD;
+ ctx->Color.Blend[i].EquationA = GL_FUNC_ADD;
+ }
+ ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 );
+ ASSIGN_4V( ctx->Color.BlendColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
+ ctx->Color.IndexLogicOpEnabled = GL_FALSE;
+ ctx->Color.ColorLogicOpEnabled = GL_FALSE;
+ ctx->Color.LogicOp = GL_COPY;
+ ctx->Color.DitherFlag = GL_TRUE;
+
+ if (ctx->Visual.doubleBufferMode) {
+ ctx->Color.DrawBuffer[0] = GL_BACK;
+ }
+ else {
+ ctx->Color.DrawBuffer[0] = GL_FRONT;
+ }
+
+ ctx->Color.ClampFragmentColor = GL_FIXED_ONLY_ARB;
+ ctx->Color._ClampFragmentColor = GL_TRUE;
+ ctx->Color.ClampReadColor = GL_FIXED_ONLY_ARB;
+ ctx->Color._ClampReadColor = GL_TRUE;
+
+ if (ctx->API == API_OPENGLES2) {
+ /* GLES 3 behaves as though GL_FRAMEBUFFER_SRGB is always enabled. */
+ ctx->Color.sRGBEnabled = GL_TRUE;
+ } else {
+ ctx->Color.sRGBEnabled = GL_FALSE;
+ }
}
+/*@}*/