| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrGLSLFragmentShaderBuilder.h" |
| #include "GrRenderTarget.h" |
| #include "glsl/GrGLSL.h" |
| #include "glsl/GrGLSLCaps.h" |
| #include "glsl/GrGLSLProgramBuilder.h" |
| |
| const char* GrGLSLFragmentShaderBuilder::kDstTextureColorName = "_dstColor"; |
| |
| static const char* specific_layout_qualifier_name(GrBlendEquation equation) { |
| SkASSERT(GrBlendEquationIsAdvanced(equation)); |
| |
| static const char* kLayoutQualifierNames[] = { |
| "blend_support_screen", |
| "blend_support_overlay", |
| "blend_support_darken", |
| "blend_support_lighten", |
| "blend_support_colordodge", |
| "blend_support_colorburn", |
| "blend_support_hardlight", |
| "blend_support_softlight", |
| "blend_support_difference", |
| "blend_support_exclusion", |
| "blend_support_multiply", |
| "blend_support_hsl_hue", |
| "blend_support_hsl_saturation", |
| "blend_support_hsl_color", |
| "blend_support_hsl_luminosity" |
| }; |
| return kLayoutQualifierNames[equation - kFirstAdvancedGrBlendEquation]; |
| |
| GR_STATIC_ASSERT(0 == kScreen_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(1 == kOverlay_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(2 == kDarken_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(3 == kLighten_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(4 == kColorDodge_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(5 == kColorBurn_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(6 == kHardLight_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(7 == kSoftLight_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(8 == kDifference_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(9 == kExclusion_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(10 == kMultiply_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(11 == kHSLHue_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(12 == kHSLSaturation_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(13 == kHSLColor_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(14 == kHSLLuminosity_GrBlendEquation - kFirstAdvancedGrBlendEquation); |
| GR_STATIC_ASSERT(SK_ARRAY_COUNT(kLayoutQualifierNames) == |
| kGrBlendEquationCnt - kFirstAdvancedGrBlendEquation); |
| } |
| |
| GrGLSLFragmentShaderBuilder::FragPosKey |
| GrGLSLFragmentShaderBuilder::KeyForFragmentPosition(const GrRenderTarget* dst) { |
| if (kTopLeft_GrSurfaceOrigin == dst->origin()) { |
| return kTopLeftFragPosRead_FragPosKey; |
| } else { |
| return kBottomLeftFragPosRead_FragPosKey; |
| } |
| } |
| |
| GrGLSLFragmentShaderBuilder::GrGLSLFragmentShaderBuilder(GrGLSLProgramBuilder* program, |
| uint8_t fragPosKey) |
| : INHERITED(program) |
| , fSetupFragPosition(false) |
| , fTopLeftFragPosRead(kTopLeftFragPosRead_FragPosKey == fragPosKey) |
| , fCustomColorOutputIndex(-1) |
| , fHasReadDstColor(false) |
| , fHasReadFragmentPosition(false) { |
| } |
| |
| bool GrGLSLFragmentShaderBuilder::enableFeature(GLSLFeature feature) { |
| switch (feature) { |
| case kStandardDerivatives_GLSLFeature: { |
| if (!fProgramBuilder->glslCaps()->shaderDerivativeSupport()) { |
| return false; |
| } |
| const char* extension = fProgramBuilder->glslCaps()->shaderDerivativeExtensionString(); |
| if (extension) { |
| this->addFeature(1 << kStandardDerivatives_GLSLFeature, extension); |
| } |
| return true; |
| } |
| default: |
| SkFAIL("Unexpected GLSLFeature requested."); |
| return false; |
| } |
| } |
| |
| SkString GrGLSLFragmentShaderBuilder::ensureFSCoords2D(const GrGLSLTransformedCoordsArray& coords, |
| int index) { |
| if (kVec3f_GrSLType != coords[index].getType()) { |
| SkASSERT(kVec2f_GrSLType == coords[index].getType()); |
| return coords[index].getName(); |
| } |
| |
| SkString coords2D("coords2D"); |
| if (0 != index) { |
| coords2D.appendf("_%i", index); |
| } |
| this->codeAppendf("\tvec2 %s = %s.xy / %s.z;", |
| coords2D.c_str(), coords[index].c_str(), coords[index].c_str()); |
| return coords2D; |
| } |
| |
| const char* GrGLSLFragmentShaderBuilder::fragmentPosition() { |
| fHasReadFragmentPosition = true; |
| |
| const GrGLSLCaps* glslCaps = fProgramBuilder->glslCaps(); |
| // We only declare "gl_FragCoord" when we're in the case where we want to use layout qualifiers |
| // to reverse y. Otherwise it isn't necessary and whether the "in" qualifier appears in the |
| // declaration varies in earlier GLSL specs. So it is simpler to omit it. |
| if (fTopLeftFragPosRead) { |
| fSetupFragPosition = true; |
| return "gl_FragCoord"; |
| } else if (const char* extension = glslCaps->fragCoordConventionsExtensionString()) { |
| if (!fSetupFragPosition) { |
| if (glslCaps->generation() < k150_GrGLSLGeneration) { |
| this->addFeature(1 << kFragCoordConventions_GLSLPrivateFeature, |
| extension); |
| } |
| fInputs.push_back().set(kVec4f_GrSLType, |
| GrGLSLShaderVar::kIn_TypeModifier, |
| "gl_FragCoord", |
| kDefault_GrSLPrecision, |
| GrGLSLShaderVar::kUpperLeft_Origin); |
| fSetupFragPosition = true; |
| } |
| return "gl_FragCoord"; |
| } else { |
| static const char* kTempName = "tmpXYFragCoord"; |
| static const char* kCoordName = "fragCoordYDown"; |
| if (!fSetupFragPosition) { |
| SkASSERT(!fProgramBuilder->fUniformHandles.fRTHeightUni.isValid()); |
| const char* rtHeightName; |
| |
| fProgramBuilder->fUniformHandles.fRTHeightUni = |
| fProgramBuilder->addFragPosUniform(GrGLSLProgramBuilder::kFragment_Visibility, |
| kFloat_GrSLType, |
| kDefault_GrSLPrecision, |
| "RTHeight", |
| &rtHeightName); |
| |
| // The Adreno compiler seems to be very touchy about access to "gl_FragCoord". |
| // Accessing glFragCoord.zw can cause a program to fail to link. Additionally, |
| // depending on the surrounding code, accessing .xy with a uniform involved can |
| // do the same thing. Copying gl_FragCoord.xy into a temp vec2 beforehand |
| // (and only accessing .xy) seems to "fix" things. |
| this->codePrependf("\tvec4 %s = vec4(%s.x, %s - %s.y, 1.0, 1.0);\n", |
| kCoordName, kTempName, rtHeightName, kTempName); |
| this->codePrependf("vec2 %s = gl_FragCoord.xy;", kTempName); |
| fSetupFragPosition = true; |
| } |
| SkASSERT(fProgramBuilder->fUniformHandles.fRTHeightUni.isValid()); |
| return kCoordName; |
| } |
| } |
| |
| const char* GrGLSLFragmentShaderBuilder::dstColor() { |
| fHasReadDstColor = true; |
| |
| const GrGLSLCaps* glslCaps = fProgramBuilder->glslCaps(); |
| if (glslCaps->fbFetchSupport()) { |
| this->addFeature(1 << (GrGLSLFragmentShaderBuilder::kLastGLSLPrivateFeature + 1), |
| glslCaps->fbFetchExtensionString()); |
| |
| // Some versions of this extension string require declaring custom color output on ES 3.0+ |
| const char* fbFetchColorName = glslCaps->fbFetchColorName(); |
| if (glslCaps->fbFetchNeedsCustomOutput()) { |
| this->enableCustomOutput(); |
| fOutputs[fCustomColorOutputIndex].setTypeModifier(GrShaderVar::kInOut_TypeModifier); |
| fbFetchColorName = DeclaredColorOutputName(); |
| } |
| return fbFetchColorName; |
| } else { |
| return kDstTextureColorName; |
| } |
| } |
| |
| void GrGLSLFragmentShaderBuilder::enableAdvancedBlendEquationIfNeeded(GrBlendEquation equation) { |
| SkASSERT(GrBlendEquationIsAdvanced(equation)); |
| |
| const GrGLSLCaps& caps = *fProgramBuilder->glslCaps(); |
| if (!caps.mustEnableAdvBlendEqs()) { |
| return; |
| } |
| |
| this->addFeature(1 << kBlendEquationAdvanced_GLSLPrivateFeature, |
| "GL_KHR_blend_equation_advanced"); |
| if (caps.mustEnableSpecificAdvBlendEqs()) { |
| this->addLayoutQualifier(specific_layout_qualifier_name(equation), kOut_InterfaceQualifier); |
| } else { |
| this->addLayoutQualifier("blend_support_all_equations", kOut_InterfaceQualifier); |
| } |
| } |
| |
| void GrGLSLFragmentShaderBuilder::enableCustomOutput() { |
| if (!fHasCustomColorOutput) { |
| fHasCustomColorOutput = true; |
| fCustomColorOutputIndex = fOutputs.count(); |
| fOutputs.push_back().set(kVec4f_GrSLType, |
| GrGLSLShaderVar::kOut_TypeModifier, |
| DeclaredColorOutputName()); |
| } |
| } |
| |
| void GrGLSLFragmentShaderBuilder::enableSecondaryOutput() { |
| SkASSERT(!fHasSecondaryOutput); |
| fHasSecondaryOutput = true; |
| const GrGLSLCaps& caps = *fProgramBuilder->glslCaps(); |
| if (const char* extension = caps.secondaryOutputExtensionString()) { |
| this->addFeature(1 << kBlendFuncExtended_GLSLPrivateFeature, extension); |
| } |
| |
| // If the primary output is declared, we must declare also the secondary output |
| // and vice versa, since it is not allowed to use a built-in gl_FragColor and a custom |
| // output. The condition also co-incides with the condition in whici GLES SL 2.0 |
| // requires the built-in gl_SecondaryFragColorEXT, where as 3.0 requires a custom output. |
| if (caps.mustDeclareFragmentShaderOutput()) { |
| fOutputs.push_back().set(kVec4f_GrSLType, GrGLSLShaderVar::kOut_TypeModifier, |
| DeclaredSecondaryColorOutputName()); |
| } |
| } |
| |
| const char* GrGLSLFragmentShaderBuilder::getPrimaryColorOutputName() const { |
| return fHasCustomColorOutput ? DeclaredColorOutputName() : "gl_FragColor"; |
| } |
| |
| const char* GrGLSLFragmentShaderBuilder::getSecondaryColorOutputName() const { |
| const GrGLSLCaps& caps = *fProgramBuilder->glslCaps(); |
| return caps.mustDeclareFragmentShaderOutput() ? DeclaredSecondaryColorOutputName() |
| : "gl_SecondaryFragColorEXT"; |
| } |
| |
| void GrGLSLFragmentShaderBuilder::onFinalize() { |
| GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision, |
| *fProgramBuilder->glslCaps(), |
| &this->precisionQualifier()); |
| } |
| |
| void GrGLSLFragmentShaderBuilder::addVarying(GrGLSLVarying* v, GrSLPrecision fsPrec) { |
| v->fFsIn = v->fVsOut; |
| if (v->fGsOut) { |
| v->fFsIn = v->fGsOut; |
| } |
| fInputs.push_back().set(v->fType, GrGLSLShaderVar::kVaryingIn_TypeModifier, v->fFsIn, fsPrec); |
| } |
| |
| void GrGLSLFragmentBuilder::onBeforeChildProcEmitCode() { |
| SkASSERT(fSubstageIndices.count() >= 1); |
| fSubstageIndices.push_back(0); |
| // second-to-last value in the fSubstageIndices stack is the index of the child proc |
| // at that level which is currently emitting code. |
| fMangleString.appendf("_c%d", fSubstageIndices[fSubstageIndices.count() - 2]); |
| } |
| |
| void GrGLSLFragmentBuilder::onAfterChildProcEmitCode() { |
| SkASSERT(fSubstageIndices.count() >= 2); |
| fSubstageIndices.pop_back(); |
| fSubstageIndices.back()++; |
| int removeAt = fMangleString.findLastOf('_'); |
| fMangleString.remove(removeAt, fMangleString.size() - removeAt); |
| } |
| |