| /** |
| * \file blend.c |
| * Blending operations. |
| */ |
| |
| /* |
| * Mesa 3-D graphics library |
| * |
| * 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 |
| * THE AUTHORS OR COPYRIGHT HOLDERS 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: |
| 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 ctx->API != API_OPENGLES |
| && 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: |
| 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 (ctx->API != API_OPENGLES |
| && 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 ctx->API != API_OPENGLES |
| && 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_enum_to_string(sfactorRGB)); |
| return GL_FALSE; |
| } |
| |
| if (!legal_dst_factor(ctx, dfactorRGB)) { |
| _mesa_error(ctx, GL_INVALID_ENUM, |
| "%s(dfactorRGB = %s)", func, |
| _mesa_enum_to_string(dfactorRGB)); |
| return GL_FALSE; |
| } |
| |
| if (sfactorA != sfactorRGB && !legal_src_factor(ctx, sfactorA)) { |
| _mesa_error(ctx, GL_INVALID_ENUM, |
| "%s(sfactorA = %s)", func, |
| _mesa_enum_to_string(sfactorA)); |
| return GL_FALSE; |
| } |
| |
| if (dfactorA != dfactorRGB && !legal_dst_factor(ctx, dfactorA)) { |
| _mesa_error(ctx, GL_INVALID_ENUM, |
| "%s(dfactorA = %s)", func, |
| _mesa_enum_to_string(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)); |
| } |
| |
| |
| /** |
| * Return the number of per-buffer blend states to update in |
| * glBlendFunc, glBlendFuncSeparate, glBlendEquation, etc. |
| */ |
| static inline unsigned |
| num_buffers(const struct gl_context *ctx) |
| { |
| return ctx->Extensions.ARB_draw_buffers_blend |
| ? ctx->Const.MaxDrawBuffers : 1; |
| } |
| |
| |
| /** |
| * 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 ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| const unsigned numBuffers = num_buffers(ctx); |
| unsigned buf; |
| bool changed = false; |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glBlendFuncSeparate %s %s %s %s\n", |
| _mesa_enum_to_string(sfactorRGB), |
| _mesa_enum_to_string(dfactorRGB), |
| _mesa_enum_to_string(sfactorA), |
| _mesa_enum_to_string(dfactorA)); |
| |
| /* Check if we're really changing any state. If not, return early. */ |
| if (ctx->Color._BlendFuncPerBuffer) { |
| /* Check all per-buffer states */ |
| 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 = true; |
| break; |
| } |
| } |
| } |
| else { |
| /* only need to check 0th per-buffer state */ |
| if (ctx->Color.Blend[0].SrcRGB != sfactorRGB || |
| ctx->Color.Blend[0].DstRGB != dfactorRGB || |
| ctx->Color.Blend[0].SrcA != sfactorA || |
| ctx->Color.Blend[0].DstA != dfactorA) { |
| changed = true; |
| } |
| } |
| |
| if (!changed) |
| return; |
| |
| if (!validate_blend_factors(ctx, "glBlendFuncSeparate", |
| sfactorRGB, dfactorRGB, |
| sfactorA, dfactorA)) { |
| return; |
| } |
| |
| FLUSH_VERTICES(ctx, ctx->DriverFlags.NewBlend ? 0 : _NEW_COLOR); |
| ctx->NewDriverState |= ctx->DriverFlags.NewBlend; |
| |
| 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, 0); |
| for (buf = 1; buf < numBuffers; buf++) { |
| ctx->Color.Blend[buf]._UsesDualSrc = ctx->Color.Blend[0]._UsesDualSrc; |
| } |
| |
| ctx->Color._BlendFuncPerBuffer = GL_FALSE; |
| |
| if (ctx->Driver.BlendFuncSeparate) { |
| ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB, |
| sfactorA, dfactorA); |
| } |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_BlendFunciARB_no_error(GLuint buf, GLenum sfactor, GLenum dfactor) |
| { |
| _mesa_BlendFuncSeparateiARB_no_error(buf, sfactor, dfactor, sfactor, |
| dfactor); |
| } |
| |
| |
| /** |
| * 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); |
| } |
| |
| |
| static ALWAYS_INLINE void |
| blend_func_separatei(GLuint buf, GLenum sfactorRGB, GLenum dfactorRGB, |
| GLenum sfactorA, GLenum dfactorA, bool no_error) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| |
| if (!no_error) { |
| 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 (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 */ |
| |
| if (!no_error && !validate_blend_factors(ctx, "glBlendFuncSeparatei", |
| sfactorRGB, dfactorRGB, |
| sfactorA, dfactorA)) { |
| return; |
| } |
| |
| FLUSH_VERTICES(ctx, ctx->DriverFlags.NewBlend ? 0 : _NEW_COLOR); |
| ctx->NewDriverState |= ctx->DriverFlags.NewBlend; |
| |
| 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; |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_BlendFuncSeparateiARB_no_error(GLuint buf, GLenum sfactorRGB, |
| GLenum dfactorRGB, GLenum sfactorA, |
| GLenum dfactorA) |
| { |
| blend_func_separatei(buf, sfactorRGB, dfactorRGB, sfactorA, dfactorA, |
| true); |
| } |
| |
| |
| /** |
| * 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) |
| { |
| blend_func_separatei(buf, sfactorRGB, dfactorRGB, sfactorA, dfactorA, |
| false); |
| } |
| |
| |
| /** |
| * Return true if \p mode is a legal blending equation, excluding |
| * GL_KHR_blend_equation_advanced modes. |
| */ |
| static bool |
| legal_simple_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; |
| } |
| } |
| |
| static enum gl_advanced_blend_mode |
| advanced_blend_mode_from_gl_enum(GLenum mode) |
| { |
| switch (mode) { |
| case GL_MULTIPLY_KHR: |
| return BLEND_MULTIPLY; |
| case GL_SCREEN_KHR: |
| return BLEND_SCREEN; |
| case GL_OVERLAY_KHR: |
| return BLEND_OVERLAY; |
| case GL_DARKEN_KHR: |
| return BLEND_DARKEN; |
| case GL_LIGHTEN_KHR: |
| return BLEND_LIGHTEN; |
| case GL_COLORDODGE_KHR: |
| return BLEND_COLORDODGE; |
| case GL_COLORBURN_KHR: |
| return BLEND_COLORBURN; |
| case GL_HARDLIGHT_KHR: |
| return BLEND_HARDLIGHT; |
| case GL_SOFTLIGHT_KHR: |
| return BLEND_SOFTLIGHT; |
| case GL_DIFFERENCE_KHR: |
| return BLEND_DIFFERENCE; |
| case GL_EXCLUSION_KHR: |
| return BLEND_EXCLUSION; |
| case GL_HSL_HUE_KHR: |
| return BLEND_HSL_HUE; |
| case GL_HSL_SATURATION_KHR: |
| return BLEND_HSL_SATURATION; |
| case GL_HSL_COLOR_KHR: |
| return BLEND_HSL_COLOR; |
| case GL_HSL_LUMINOSITY_KHR: |
| return BLEND_HSL_LUMINOSITY; |
| default: |
| return BLEND_NONE; |
| } |
| } |
| |
| /** |
| * If \p mode is one of the advanced blending equations defined by |
| * GL_KHR_blend_equation_advanced (and the extension is supported), |
| * return the corresponding BLEND_* enum. Otherwise, return BLEND_NONE |
| * (which can also be treated as false). |
| */ |
| static enum gl_advanced_blend_mode |
| advanced_blend_mode(const struct gl_context *ctx, GLenum mode) |
| { |
| return _mesa_has_KHR_blend_equation_advanced(ctx) ? |
| advanced_blend_mode_from_gl_enum(mode) : BLEND_NONE; |
| } |
| |
| /* This is really an extension function! */ |
| void GLAPIENTRY |
| _mesa_BlendEquation( GLenum mode ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| const unsigned numBuffers = num_buffers(ctx); |
| unsigned buf; |
| bool changed = false; |
| enum gl_advanced_blend_mode advanced_mode = advanced_blend_mode(ctx, mode); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glBlendEquation(%s)\n", |
| _mesa_enum_to_string(mode)); |
| |
| if (ctx->Color._BlendEquationPerBuffer) { |
| /* Check all per-buffer states */ |
| for (buf = 0; buf < numBuffers; buf++) { |
| if (ctx->Color.Blend[buf].EquationRGB != mode || |
| ctx->Color.Blend[buf].EquationA != mode) { |
| changed = true; |
| break; |
| } |
| } |
| } |
| else { |
| /* only need to check 0th per-buffer state */ |
| if (ctx->Color.Blend[0].EquationRGB != mode || |
| ctx->Color.Blend[0].EquationA != mode) { |
| changed = true; |
| } |
| } |
| |
| if (!changed) |
| return; |
| |
| |
| if (!legal_simple_blend_equation(ctx, mode) && !advanced_mode) { |
| _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation"); |
| return; |
| } |
| |
| _mesa_flush_vertices_for_blend_state(ctx); |
| |
| for (buf = 0; buf < numBuffers; buf++) { |
| ctx->Color.Blend[buf].EquationRGB = mode; |
| ctx->Color.Blend[buf].EquationA = mode; |
| } |
| ctx->Color._BlendEquationPerBuffer = GL_FALSE; |
| ctx->Color._AdvancedBlendMode = advanced_mode; |
| |
| 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); |
| enum gl_advanced_blend_mode advanced_mode = advanced_blend_mode(ctx, mode); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glBlendEquationi(%u, %s)\n", |
| buf, _mesa_enum_to_string(mode)); |
| |
| if (buf >= ctx->Const.MaxDrawBuffers) { |
| _mesa_error(ctx, GL_INVALID_VALUE, "glBlendEquationi(buffer=%u)", |
| buf); |
| return; |
| } |
| |
| if (!legal_simple_blend_equation(ctx, mode) && !advanced_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 */ |
| |
| _mesa_flush_vertices_for_blend_state(ctx); |
| ctx->Color.Blend[buf].EquationRGB = mode; |
| ctx->Color.Blend[buf].EquationA = mode; |
| ctx->Color._BlendEquationPerBuffer = GL_TRUE; |
| |
| if (buf == 0) |
| ctx->Color._AdvancedBlendMode = advanced_mode; |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_BlendEquationSeparate( GLenum modeRGB, GLenum modeA ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| const unsigned numBuffers = num_buffers(ctx); |
| unsigned buf; |
| bool changed = false; |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glBlendEquationSeparateEXT(%s %s)\n", |
| _mesa_enum_to_string(modeRGB), |
| _mesa_enum_to_string(modeA)); |
| |
| if (ctx->Color._BlendEquationPerBuffer) { |
| /* Check all per-buffer states */ |
| for (buf = 0; buf < numBuffers; buf++) { |
| if (ctx->Color.Blend[buf].EquationRGB != modeRGB || |
| ctx->Color.Blend[buf].EquationA != modeA) { |
| changed = true; |
| break; |
| } |
| } |
| } |
| else { |
| /* only need to check 0th per-buffer state */ |
| if (ctx->Color.Blend[0].EquationRGB != modeRGB || |
| ctx->Color.Blend[0].EquationA != modeA) { |
| changed = true; |
| } |
| } |
| |
| if (!changed) |
| return; |
| |
| if ( (modeRGB != modeA) && !ctx->Extensions.EXT_blend_equation_separate ) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glBlendEquationSeparateEXT not supported by driver"); |
| return; |
| } |
| |
| /* Only allow simple blending equations. |
| * The GL_KHR_blend_equation_advanced spec says: |
| * |
| * "NOTE: These enums are not accepted by the <modeRGB> or <modeAlpha> |
| * parameters of BlendEquationSeparate or BlendEquationSeparatei." |
| */ |
| if (!legal_simple_blend_equation(ctx, modeRGB)) { |
| _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)"); |
| return; |
| } |
| |
| if (!legal_simple_blend_equation(ctx, modeA)) { |
| _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeA)"); |
| return; |
| } |
| |
| _mesa_flush_vertices_for_blend_state(ctx); |
| |
| for (buf = 0; buf < numBuffers; buf++) { |
| ctx->Color.Blend[buf].EquationRGB = modeRGB; |
| ctx->Color.Blend[buf].EquationA = modeA; |
| } |
| ctx->Color._BlendEquationPerBuffer = GL_FALSE; |
| ctx->Color._AdvancedBlendMode = BLEND_NONE; |
| |
| if (ctx->Driver.BlendEquationSeparate) |
| ctx->Driver.BlendEquationSeparate(ctx, modeRGB, modeA); |
| } |
| |
| |
| static void |
| blend_equation_separatei(struct gl_context *ctx, GLuint buf, GLenum modeRGB, |
| GLenum modeA) |
| { |
| if (ctx->Color.Blend[buf].EquationRGB == modeRGB && |
| ctx->Color.Blend[buf].EquationA == modeA) |
| return; /* no change */ |
| |
| _mesa_flush_vertices_for_blend_state(ctx); |
| ctx->Color.Blend[buf].EquationRGB = modeRGB; |
| ctx->Color.Blend[buf].EquationA = modeA; |
| ctx->Color._BlendEquationPerBuffer = GL_TRUE; |
| ctx->Color._AdvancedBlendMode = BLEND_NONE; |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_BlendEquationSeparateiARB_no_error(GLuint buf, GLenum modeRGB, |
| GLenum modeA) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| blend_equation_separatei(ctx, buf, 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); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glBlendEquationSeparatei(%u, %s %s)\n", buf, |
| _mesa_enum_to_string(modeRGB), |
| _mesa_enum_to_string(modeA)); |
| |
| if (buf >= ctx->Const.MaxDrawBuffers) { |
| _mesa_error(ctx, GL_INVALID_VALUE, "glBlendEquationSeparatei(buffer=%u)", |
| buf); |
| return; |
| } |
| |
| /* Only allow simple blending equations. |
| * The GL_KHR_blend_equation_advanced spec says: |
| * |
| * "NOTE: These enums are not accepted by the <modeRGB> or <modeAlpha> |
| * parameters of BlendEquationSeparate or BlendEquationSeparatei." |
| */ |
| if (!legal_simple_blend_equation(ctx, modeRGB)) { |
| _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)"); |
| return; |
| } |
| |
| if (!legal_simple_blend_equation(ctx, modeA)) { |
| _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeA)"); |
| return; |
| } |
| |
| blend_equation_separatei(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); |
| |
| tmp[0] = red; |
| tmp[1] = green; |
| tmp[2] = blue; |
| tmp[3] = alpha; |
| |
| if (TEST_EQ_4V(tmp, ctx->Color.BlendColorUnclamped)) |
| return; |
| |
| FLUSH_VERTICES(ctx, ctx->DriverFlags.NewBlendColor ? 0 : _NEW_COLOR); |
| ctx->NewDriverState |= ctx->DriverFlags.NewBlendColor; |
| 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); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glAlphaFunc(%s, %f)\n", |
| _mesa_enum_to_string(func), ref); |
| |
| if (ctx->Color.AlphaFunc == func && ctx->Color.AlphaRefUnclamped == ref) |
| return; /* no change */ |
| |
| 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: |
| FLUSH_VERTICES(ctx, ctx->DriverFlags.NewAlphaTest ? 0 : _NEW_COLOR); |
| ctx->NewDriverState |= ctx->DriverFlags.NewAlphaTest; |
| 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; |
| } |
| } |
| |
| |
| static void |
| logic_op(struct gl_context *ctx, GLenum opcode) |
| { |
| if (ctx->Color.LogicOp == opcode) |
| return; |
| |
| FLUSH_VERTICES(ctx, ctx->DriverFlags.NewLogicOp ? 0 : _NEW_COLOR); |
| ctx->NewDriverState |= ctx->DriverFlags.NewLogicOp; |
| ctx->Color.LogicOp = opcode; |
| |
| if (ctx->Driver.LogicOpcode) |
| ctx->Driver.LogicOpcode(ctx, opcode); |
| } |
| |
| |
| /** |
| * 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); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glLogicOp(%s)\n", _mesa_enum_to_string(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; |
| } |
| |
| logic_op(ctx, opcode); |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_LogicOp_no_error(GLenum opcode) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| logic_op(ctx, opcode); |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_IndexMask( GLuint mask ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| |
| if (ctx->Color.IndexMask == mask) |
| return; |
| |
| FLUSH_VERTICES(ctx, ctx->DriverFlags.NewColorMask ? 0 : _NEW_COLOR); |
| ctx->NewDriverState |= ctx->DriverFlags.NewColorMask; |
| 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; |
| |
| 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, ctx->DriverFlags.NewColorMask ? 0 : _NEW_COLOR); |
| ctx->NewDriverState |= ctx->DriverFlags.NewColorMask; |
| } |
| 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_ColorMaski( GLuint buf, GLboolean red, GLboolean green, |
| GLboolean blue, GLboolean alpha ) |
| { |
| GLubyte tmp[4]; |
| GET_CURRENT_CONTEXT(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, ctx->DriverFlags.NewColorMask ? 0 : _NEW_COLOR); |
| ctx->NewDriverState |= ctx->DriverFlags.NewColorMask; |
| COPY_4UBV(ctx->Color.ColorMask[buf], tmp); |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_ClampColor(GLenum target, GLenum clamp) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| |
| /* Check for both the extension and the GL version, since the Intel driver |
| * does not advertise the extension in core profiles. |
| */ |
| if (ctx->Version <= 30 && !ctx->Extensions.ARB_color_buffer_float) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, "glClampColor()"); |
| return; |
| } |
| |
| 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: |
| if (ctx->API == API_OPENGL_CORE) |
| goto invalid_enum; |
| FLUSH_VERTICES(ctx, _NEW_LIGHT); |
| ctx->Light.ClampVertexColor = clamp; |
| _mesa_update_clamp_vertex_color(ctx, ctx->DrawBuffer); |
| break; |
| case GL_CLAMP_FRAGMENT_COLOR_ARB: |
| if (ctx->API == API_OPENGL_CORE) |
| goto invalid_enum; |
| FLUSH_VERTICES(ctx, _NEW_FRAG_CLAMP); |
| ctx->Color.ClampFragmentColor = clamp; |
| _mesa_update_clamp_fragment_color(ctx, ctx->DrawBuffer); |
| break; |
| case GL_CLAMP_READ_COLOR_ARB: |
| ctx->Color.ClampReadColor = clamp; |
| break; |
| default: |
| goto invalid_enum; |
| } |
| return; |
| |
| invalid_enum: |
| _mesa_error(ctx, GL_INVALID_ENUM, "glClampColor(%s)", |
| _mesa_enum_to_string(target)); |
| } |
| |
| static GLboolean |
| get_clamp_color(const struct gl_framebuffer *fb, GLenum clamp) |
| { |
| if (clamp == GL_TRUE || clamp == GL_FALSE) |
| return clamp; |
| |
| assert(clamp == GL_FIXED_ONLY); |
| if (!fb) |
| return GL_TRUE; |
| |
| return fb->_AllColorBuffersFixedPoint; |
| } |
| |
| GLboolean |
| _mesa_get_clamp_fragment_color(const struct gl_context *ctx, |
| const struct gl_framebuffer *drawFb) |
| { |
| return get_clamp_color(drawFb, ctx->Color.ClampFragmentColor); |
| } |
| |
| GLboolean |
| _mesa_get_clamp_vertex_color(const struct gl_context *ctx, |
| const struct gl_framebuffer *drawFb) |
| { |
| return get_clamp_color(drawFb, ctx->Light.ClampVertexColor); |
| } |
| |
| GLboolean |
| _mesa_get_clamp_read_color(const struct gl_context *ctx, |
| const struct gl_framebuffer *readFb) |
| { |
| return get_clamp_color(readFb, ctx->Color.ClampReadColor); |
| } |
| |
| /** |
| * Update the ctx->Color._ClampFragmentColor field |
| */ |
| void |
| _mesa_update_clamp_fragment_color(struct gl_context *ctx, |
| const struct gl_framebuffer *drawFb) |
| { |
| /* Don't clamp if: |
| * - there is no colorbuffer |
| * - all colorbuffers are unsigned normalized, so clamping has no effect |
| * - there is an integer colorbuffer |
| */ |
| if (!drawFb || !drawFb->_HasSNormOrFloatColorBuffer || |
| drawFb->_IntegerBuffers) |
| ctx->Color._ClampFragmentColor = GL_FALSE; |
| else |
| ctx->Color._ClampFragmentColor = |
| _mesa_get_clamp_fragment_color(ctx, drawFb); |
| } |
| |
| /** |
| * Update the ctx->Color._ClampVertexColor field |
| */ |
| void |
| _mesa_update_clamp_vertex_color(struct gl_context *ctx, |
| const struct gl_framebuffer *drawFb) |
| { |
| ctx->Light._ClampVertexColor = |
| _mesa_get_clamp_vertex_color(ctx, drawFb); |
| } |
| |
| /** |
| * Returns an appropriate mesa_format for color rendering based on the |
| * GL_FRAMEBUFFER_SRGB state. |
| * |
| * Some drivers implement GL_FRAMEBUFFER_SRGB using a flag on the blend state |
| * (which GL_FRAMEBUFFER_SRGB maps to reasonably), but some have to do so by |
| * overriding the format of the surface. This is a helper for doing the |
| * surface format override variant. |
| */ |
| mesa_format |
| _mesa_get_render_format(const struct gl_context *ctx, mesa_format format) |
| { |
| if (ctx->Color.sRGBEnabled) |
| return format; |
| else |
| return _mesa_get_srgb_format_linear(format); |
| } |
| |
| /**********************************************************************/ |
| /** \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 < ARRAY_SIZE(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; |
| |
| /* GL_FRONT is not possible on GLES. Instead GL_BACK will render to either |
| * the front or the back buffer depending on the config */ |
| if (ctx->Visual.doubleBufferMode || _mesa_is_gles(ctx)) { |
| ctx->Color.DrawBuffer[0] = GL_BACK; |
| } |
| else { |
| ctx->Color.DrawBuffer[0] = GL_FRONT; |
| } |
| |
| ctx->Color.ClampFragmentColor = ctx->API == API_OPENGL_COMPAT ? |
| GL_FIXED_ONLY_ARB : GL_FALSE; |
| ctx->Color._ClampFragmentColor = GL_FALSE; |
| ctx->Color.ClampReadColor = GL_FIXED_ONLY_ARB; |
| |
| /* GLES 1/2/3 behaves as though GL_FRAMEBUFFER_SRGB is always enabled |
| * if EGL_KHR_gl_colorspace has been used to request sRGB. |
| */ |
| ctx->Color.sRGBEnabled = _mesa_is_gles(ctx); |
| |
| ctx->Color.BlendCoherent = true; |
| } |
| |
| /*@}*/ |