diff options
Diffstat (limited to 'mesalib/src/mesa/main/blend.c')
| -rw-r--r-- | mesalib/src/mesa/main/blend.c | 1644 |
1 files changed, 822 insertions, 822 deletions
diff --git a/mesalib/src/mesa/main/blend.c b/mesalib/src/mesa/main/blend.c index c74a16803..22031fd2a 100644 --- a/mesalib/src/mesa/main/blend.c +++ b/mesalib/src/mesa/main/blend.c @@ -1,822 +1,822 @@ -/** - * \file blend.c - * Blending operations. - */ - -/* - * Mesa 3-D graphics library - * Version: 6.5.1 - * - * 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"), - * 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. - */ - - - -#include "glheader.h" -#include "blend.h" -#include "context.h" -#include "enums.h" -#include "macros.h" -#include "mtypes.h" - - - -/** - * 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: - case GL_CONSTANT_COLOR: - case GL_ONE_MINUS_CONSTANT_COLOR: - case GL_CONSTANT_ALPHA: - case GL_ONE_MINUS_CONSTANT_ALPHA: - return GL_TRUE; - 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: - case GL_CONSTANT_COLOR: - case GL_ONE_MINUS_CONSTANT_COLOR: - case GL_CONSTANT_ALPHA: - case GL_ONE_MINUS_CONSTANT_ALPHA: - return GL_TRUE; - 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_BlendFuncSeparateEXT(sfactor, dfactor, sfactor, dfactor); -} - - -/** - * 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_BlendFuncSeparateEXT( 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) - _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; - } - - 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; - } - } - 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; - } - ctx->Color._BlendFuncPerBuffer = GL_FALSE; - - if (ctx->Driver.BlendFuncSeparate) { - ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB, - sfactorA, dfactorA); - } -} - - -#if _HAVE_FULL_GL - - -/** - * Set blend source/dest factors for one color buffer/target. - */ -void GLAPIENTRY -_mesa_BlendFunci(GLuint buf, GLenum sfactor, GLenum dfactor) -{ - _mesa_BlendFuncSeparatei(buf, sfactor, dfactor, sfactor, dfactor); -} - - -/** - * Set separate blend source/dest factors for one color buffer/target. - */ -void GLAPIENTRY -_mesa_BlendFuncSeparatei(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 (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.Blend[buf].SrcRGB = sfactorRGB; - ctx->Color.Blend[buf].DstRGB = dfactorRGB; - ctx->Color.Blend[buf].SrcA = sfactorA; - ctx->Color.Blend[buf].DstA = dfactorA; - ctx->Color._BlendFuncPerBuffer = GL_TRUE; - - if (ctx->Driver.BlendFuncSeparatei) { - ctx->Driver.BlendFuncSeparatei(ctx, buf, sfactorRGB, dfactorRGB, - sfactorA, 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, GLboolean is_separate) -{ - switch (mode) { - case GL_FUNC_ADD: - return GL_TRUE; - case GL_MIN: - case GL_MAX: - return ctx->Extensions.EXT_blend_minmax; - case GL_LOGIC_OP: - /* glBlendEquationSeparate cannot take GL_LOGIC_OP as a parameter. - */ - return ctx->Extensions.EXT_blend_logic_op && !is_separate; - case GL_FUNC_SUBTRACT: - case GL_FUNC_REVERSE_SUBTRACT: - return ctx->Extensions.EXT_blend_subtract; - 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) - _mesa_debug(ctx, "glBlendEquation(%s)\n", - _mesa_lookup_enum_by_nr(mode)); - - if (!legal_blend_equation(ctx, mode, GL_FALSE)) { - _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation"); - 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 != mode || - ctx->Color.Blend[buf].EquationA != mode) { - changed = GL_TRUE; - break; - } - } - if (!changed) - 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; - - if (ctx->Driver.BlendEquationSeparate) - (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode ); -} - - -/** - * Set blend equation for one color buffer/target. - */ -void GLAPIENTRY -_mesa_BlendEquationi(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 (!legal_blend_equation(ctx, mode, GL_FALSE)) { - _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; - - if (ctx->Driver.BlendEquationSeparatei) - ctx->Driver.BlendEquationSeparatei(ctx, buf, mode, mode); -} - - -void GLAPIENTRY -_mesa_BlendEquationSeparateEXT( 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, GL_TRUE)) { - _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)"); - return; - } - - if (!legal_blend_equation(ctx, modeA, GL_TRUE)) { - _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 -_mesa_BlendEquationSeparatei(GLuint buf, GLenum modeRGB, GLenum modeA) -{ - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END(ctx); - - 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, GL_TRUE)) { - _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)"); - return; - } - - if (!legal_blend_equation(ctx, modeA, GL_TRUE)) { - _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); -} - - - -#endif /* _HAVE_FULL_GL */ - - -/** - * 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); - - tmp[0] = CLAMP( red, 0.0F, 1.0F ); - tmp[1] = CLAMP( green, 0.0F, 1.0F ); - tmp[2] = CLAMP( blue, 0.0F, 1.0F ); - tmp[3] = CLAMP( alpha, 0.0F, 1.0F ); - - if (TEST_EQ_4V(tmp, ctx->Color.BlendColor)) - return; - - FLUSH_VERTICES(ctx, _NEW_COLOR); - COPY_4FV( ctx->Color.BlendColor, tmp ); - - if (ctx->Driver.BlendColor) - (*ctx->Driver.BlendColor)(ctx, tmp); -} - - -/** - * 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: - ref = CLAMP(ref, 0.0F, 1.0F); - - if (ctx->Color.AlphaFunc == func && ctx->Color.AlphaRef == ref) - return; /* no change */ - - FLUSH_VERTICES(ctx, _NEW_COLOR); - ctx->Color.AlphaFunc = func; - ctx->Color.AlphaRef = ref; - - if (ctx->Driver.AlphaFunc) - ctx->Driver.AlphaFunc(ctx, func, ref); - 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: - _mesa_error( ctx, GL_INVALID_ENUM, "glLogicOp" ); - return; - } - - if (ctx->Color.LogicOp == opcode) - return; - - FLUSH_VERTICES(ctx, _NEW_COLOR); - ctx->Color.LogicOp = opcode; - - if (ctx->Driver.LogicOpcode) - ctx->Driver.LogicOpcode( ctx, opcode ); -} - -#if _HAVE_FULL_GL -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; -} -#endif - - -/** - * 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); - } - } - - if (ctx->Driver.ColorMask) - ctx->Driver.ColorMask( ctx, red, green, blue, alpha ); -} - - -/** - * For GL_EXT_draw_buffers2 and GL3 - */ -void GLAPIENTRY -_mesa_ColorMaskIndexed( GLuint buf, GLboolean red, GLboolean green, - GLboolean blue, GLboolean alpha ) -{ - GLubyte tmp[4]; - GET_CURRENT_CONTEXT(ctx); - ASSERT_OUTSIDE_BEGIN_END(ctx); - - 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; - } - - /* 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_4UBV(ctx->Color.ColorMask[buf], tmp); - - if (ctx->Driver.ColorMaskIndexed) - ctx->Driver.ColorMaskIndexed(ctx, buf, red, green, blue, alpha); -} - - -extern void GLAPIENTRY -_mesa_ClampColorARB(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: - ctx->Light.ClampVertexColor = clamp; - break; - case GL_CLAMP_FRAGMENT_COLOR_ARB: - ctx->Color.ClampFragmentColor = clamp; - break; - case GL_CLAMP_READ_COLOR_ARB: - 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, 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 ); - ctx->Color.IndexLogicOpEnabled = GL_FALSE; - ctx->Color.ColorLogicOpEnabled = GL_FALSE; - ctx->Color._LogicOpEnabled = 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.ClampReadColor = GL_FIXED_ONLY_ARB; -} - -/*@}*/ +/**
+ * \file blend.c
+ * Blending operations.
+ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5.1
+ *
+ * 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"),
+ * 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.
+ */
+
+
+
+#include "glheader.h"
+#include "blend.h"
+#include "context.h"
+#include "enums.h"
+#include "macros.h"
+#include "mtypes.h"
+
+
+
+/**
+ * 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:
+ case GL_CONSTANT_COLOR:
+ case GL_ONE_MINUS_CONSTANT_COLOR:
+ case GL_CONSTANT_ALPHA:
+ case GL_ONE_MINUS_CONSTANT_ALPHA:
+ return GL_TRUE;
+ 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:
+ case GL_CONSTANT_COLOR:
+ case GL_ONE_MINUS_CONSTANT_COLOR:
+ case GL_CONSTANT_ALPHA:
+ case GL_ONE_MINUS_CONSTANT_ALPHA:
+ return GL_TRUE;
+ 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_BlendFuncSeparateEXT(sfactor, dfactor, sfactor, dfactor);
+}
+
+
+/**
+ * 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_BlendFuncSeparateEXT( 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)
+ _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;
+ }
+
+ 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;
+ }
+ }
+ 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;
+ }
+ ctx->Color._BlendFuncPerBuffer = GL_FALSE;
+
+ if (ctx->Driver.BlendFuncSeparate) {
+ ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB,
+ sfactorA, dfactorA);
+ }
+}
+
+
+#if _HAVE_FULL_GL
+
+
+/**
+ * Set blend source/dest factors for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendFunci(GLuint buf, GLenum sfactor, GLenum dfactor)
+{
+ _mesa_BlendFuncSeparatei(buf, sfactor, dfactor, sfactor, dfactor);
+}
+
+
+/**
+ * Set separate blend source/dest factors for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendFuncSeparatei(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 (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.Blend[buf].SrcRGB = sfactorRGB;
+ ctx->Color.Blend[buf].DstRGB = dfactorRGB;
+ ctx->Color.Blend[buf].SrcA = sfactorA;
+ ctx->Color.Blend[buf].DstA = dfactorA;
+ ctx->Color._BlendFuncPerBuffer = GL_TRUE;
+
+ if (ctx->Driver.BlendFuncSeparatei) {
+ ctx->Driver.BlendFuncSeparatei(ctx, buf, sfactorRGB, dfactorRGB,
+ sfactorA, 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, GLboolean is_separate)
+{
+ switch (mode) {
+ case GL_FUNC_ADD:
+ return GL_TRUE;
+ case GL_MIN:
+ case GL_MAX:
+ return ctx->Extensions.EXT_blend_minmax;
+ case GL_LOGIC_OP:
+ /* glBlendEquationSeparate cannot take GL_LOGIC_OP as a parameter.
+ */
+ return ctx->Extensions.EXT_blend_logic_op && !is_separate;
+ case GL_FUNC_SUBTRACT:
+ case GL_FUNC_REVERSE_SUBTRACT:
+ return ctx->Extensions.EXT_blend_subtract;
+ 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)
+ _mesa_debug(ctx, "glBlendEquation(%s)\n",
+ _mesa_lookup_enum_by_nr(mode));
+
+ if (!legal_blend_equation(ctx, mode, GL_FALSE)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
+ 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 != mode ||
+ ctx->Color.Blend[buf].EquationA != mode) {
+ changed = GL_TRUE;
+ break;
+ }
+ }
+ if (!changed)
+ 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;
+
+ if (ctx->Driver.BlendEquationSeparate)
+ (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode );
+}
+
+
+/**
+ * Set blend equation for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendEquationi(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 (!legal_blend_equation(ctx, mode, GL_FALSE)) {
+ _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;
+
+ if (ctx->Driver.BlendEquationSeparatei)
+ ctx->Driver.BlendEquationSeparatei(ctx, buf, mode, mode);
+}
+
+
+void GLAPIENTRY
+_mesa_BlendEquationSeparateEXT( 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, GL_TRUE)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)");
+ return;
+ }
+
+ if (!legal_blend_equation(ctx, modeA, GL_TRUE)) {
+ _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
+_mesa_BlendEquationSeparatei(GLuint buf, GLenum modeRGB, GLenum modeA)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ 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, GL_TRUE)) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)");
+ return;
+ }
+
+ if (!legal_blend_equation(ctx, modeA, GL_TRUE)) {
+ _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);
+}
+
+
+
+#endif /* _HAVE_FULL_GL */
+
+
+/**
+ * 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);
+
+ tmp[0] = CLAMP( red, 0.0F, 1.0F );
+ tmp[1] = CLAMP( green, 0.0F, 1.0F );
+ tmp[2] = CLAMP( blue, 0.0F, 1.0F );
+ tmp[3] = CLAMP( alpha, 0.0F, 1.0F );
+
+ if (TEST_EQ_4V(tmp, ctx->Color.BlendColor))
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ COPY_4FV( ctx->Color.BlendColor, tmp );
+
+ if (ctx->Driver.BlendColor)
+ (*ctx->Driver.BlendColor)(ctx, tmp);
+}
+
+
+/**
+ * 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:
+ ref = CLAMP(ref, 0.0F, 1.0F);
+
+ if (ctx->Color.AlphaFunc == func && ctx->Color.AlphaRef == ref)
+ return; /* no change */
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ ctx->Color.AlphaFunc = func;
+ ctx->Color.AlphaRef = ref;
+
+ if (ctx->Driver.AlphaFunc)
+ ctx->Driver.AlphaFunc(ctx, func, ref);
+ 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:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glLogicOp" );
+ return;
+ }
+
+ if (ctx->Color.LogicOp == opcode)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_COLOR);
+ ctx->Color.LogicOp = opcode;
+
+ if (ctx->Driver.LogicOpcode)
+ ctx->Driver.LogicOpcode( ctx, opcode );
+}
+
+#if _HAVE_FULL_GL
+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;
+}
+#endif
+
+
+/**
+ * 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);
+ }
+ }
+
+ if (ctx->Driver.ColorMask)
+ ctx->Driver.ColorMask( ctx, red, green, blue, alpha );
+}
+
+
+/**
+ * For GL_EXT_draw_buffers2 and GL3
+ */
+void GLAPIENTRY
+_mesa_ColorMaskIndexed( GLuint buf, GLboolean red, GLboolean green,
+ GLboolean blue, GLboolean alpha )
+{
+ GLubyte tmp[4];
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ 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;
+ }
+
+ /* 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_4UBV(ctx->Color.ColorMask[buf], tmp);
+
+ if (ctx->Driver.ColorMaskIndexed)
+ ctx->Driver.ColorMaskIndexed(ctx, buf, red, green, blue, alpha);
+}
+
+
+extern void GLAPIENTRY
+_mesa_ClampColorARB(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:
+ ctx->Light.ClampVertexColor = clamp;
+ break;
+ case GL_CLAMP_FRAGMENT_COLOR_ARB:
+ ctx->Color.ClampFragmentColor = clamp;
+ break;
+ case GL_CLAMP_READ_COLOR_ARB:
+ 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, 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 );
+ ctx->Color.IndexLogicOpEnabled = GL_FALSE;
+ ctx->Color.ColorLogicOpEnabled = GL_FALSE;
+ ctx->Color._LogicOpEnabled = 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.ClampReadColor = GL_FIXED_ONLY_ARB;
+}
+
+/*@}*/
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