diff options
Diffstat (limited to 'mesalib/src/mesa/main/blend.c')
| -rw-r--r-- | mesalib/src/mesa/main/blend.c | 592 |
1 files changed, 592 insertions, 0 deletions
diff --git a/mesalib/src/mesa/main/blend.c b/mesalib/src/mesa/main/blend.c new file mode 100644 index 000000000..39cf6153e --- /dev/null +++ b/mesalib/src/mesa/main/blend.c @@ -0,0 +1,592 @@ +/** + * \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" +#include "glapi/glapitable.h" + + +/** + * 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); +} + + +/** + * Process GL_EXT_blend_func_separate(). + * + * \param sfactorRGB RGB source factor operator. + * \param dfactorRGB RGB destination factor operator. + * \param sfactorA alpha source factor operator. + * \param dfactorA alpha destination factor operator. + * + * Verifies the parameters and updates gl_colorbuffer_attrib. + * On a change, flush the vertices and notify the driver via + * dd_function_table::BlendFuncSeparate. + */ +void GLAPIENTRY +_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)) + _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)); + + switch (sfactorRGB) { + case GL_SRC_COLOR: + case GL_ONE_MINUS_SRC_COLOR: + if (!ctx->Extensions.NV_blend_square) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or 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: + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or 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, "glBlendFunc or 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: + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or 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, "glBlendFunc or 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: + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or 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, "glBlendFunc or 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: + _mesa_error( ctx, GL_INVALID_ENUM, "glBlendFunc or 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 ); + } +} + + +#if _HAVE_FULL_GL + +static GLboolean +_mesa_validate_blend_equation( GLcontext *ctx, + GLenum mode, GLboolean is_separate ) +{ + switch (mode) { + case GL_FUNC_ADD: + break; + case GL_MIN: + case GL_MAX: + if (!ctx->Extensions.EXT_blend_minmax && + !ctx->Extensions.ARB_imaging) { + return GL_FALSE; + } + break; + /* glBlendEquationSeparate cannot take GL_LOGIC_OP as a parameter. + */ + case GL_LOGIC_OP: + if (!ctx->Extensions.EXT_blend_logic_op || is_separate) { + return GL_FALSE; + } + break; + case GL_FUNC_SUBTRACT: + case GL_FUNC_REVERSE_SUBTRACT: + if (!ctx->Extensions.EXT_blend_subtract && + !ctx->Extensions.ARB_imaging) { + return GL_FALSE; + } + break; + default: + return GL_FALSE; + } + + return GL_TRUE; +} + + +/* This is really an extension function! */ +void GLAPIENTRY +_mesa_BlendEquation( GLenum mode ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE)) + _mesa_debug(ctx, "glBlendEquation %s\n", + _mesa_lookup_enum_by_nr(mode)); + + if ( ! _mesa_validate_blend_equation( ctx, mode, GL_FALSE ) ) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation"); + return; + } + + if ( (ctx->Color.BlendEquationRGB == mode) && + (ctx->Color.BlendEquationA == mode) ) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + ctx->Color.BlendEquationRGB = mode; + ctx->Color.BlendEquationA = mode; + + if (ctx->Driver.BlendEquationSeparate) + (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode ); +} + + +void GLAPIENTRY +_mesa_BlendEquationSeparateEXT( GLenum modeRGB, GLenum modeA ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE)) + _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 ( ! _mesa_validate_blend_equation( ctx, modeRGB, GL_TRUE ) ) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)"); + return; + } + + if ( ! _mesa_validate_blend_equation( ctx, modeA, GL_TRUE ) ) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeA)"); + return; + } + + + if ( (ctx->Color.BlendEquationRGB == modeRGB) && + (ctx->Color.BlendEquationA == modeA) ) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + ctx->Color.BlendEquationRGB = modeRGB; + ctx->Color.BlendEquationA = modeA; + + if (ctx->Driver.BlendEquationSeparate) + (*ctx->Driver.BlendEquationSeparate)( ctx, modeRGB, modeA ); +} +#endif + + +/** + * 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); + + 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); + + 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; + + if (ctx->Driver.IndexMask) + ctx->Driver.IndexMask( ctx, 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]; + 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; + + if (TEST_EQ_4UBV(tmp, ctx->Color.ColorMask)) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + COPY_4UBV(ctx->Color.ColorMask, tmp); + + if (ctx->Driver.ColorMask) + ctx->Driver.ColorMask( ctx, 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, + * __GLcontextRec::Color. + */ +void _mesa_init_color( GLcontext * ctx ) +{ + /* Color buffer group */ + ctx->Color.IndexMask = ~0u; + ctx->Color.ColorMask[0] = 0xff; + ctx->Color.ColorMask[1] = 0xff; + ctx->Color.ColorMask[2] = 0xff; + ctx->Color.ColorMask[3] = 0xff; + 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 = GL_FALSE; + ctx->Color.BlendSrcRGB = GL_ONE; + ctx->Color.BlendDstRGB = GL_ZERO; + ctx->Color.BlendSrcA = GL_ONE; + ctx->Color.BlendDstA = GL_ZERO; + ctx->Color.BlendEquationRGB = GL_FUNC_ADD; + ctx->Color.BlendEquationA = 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; +} + +/*@}*/ |