| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/gpu/GrXferProcessor.h" |
| |
| #include "src/gpu/GrCaps.h" |
| #include "src/gpu/GrPipeline.h" |
| #include "src/gpu/KeyBuilder.h" |
| #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "src/gpu/glsl/GrGLSLProgramDataManager.h" |
| |
| GrXferProcessor::GrXferProcessor(ClassID classID) |
| : INHERITED(classID) |
| , fWillReadDstColor(false) |
| , fIsLCD(false) {} |
| |
| GrXferProcessor::GrXferProcessor(ClassID classID, bool willReadDstColor, |
| GrProcessorAnalysisCoverage coverage) |
| : INHERITED(classID) |
| , fWillReadDstColor(willReadDstColor) |
| , fIsLCD(GrProcessorAnalysisCoverage::kLCD == coverage) {} |
| |
| bool GrXferProcessor::hasSecondaryOutput() const { |
| if (!this->willReadDstColor()) { |
| return this->onHasSecondaryOutput(); |
| } |
| return false; |
| } |
| |
| void GrXferProcessor::addToKey(const GrShaderCaps& caps, |
| skgpu::KeyBuilder* b, |
| const GrSurfaceOrigin* originIfDstTexture, |
| bool usesInputAttachmentForDstRead) const { |
| uint32_t key = this->willReadDstColor() ? 0x1 : 0x0; |
| if (key) { |
| if (originIfDstTexture) { |
| key |= 0x2; |
| if (kTopLeft_GrSurfaceOrigin == *originIfDstTexture) { |
| key |= 0x4; |
| } |
| if (usesInputAttachmentForDstRead) { |
| key |= 0x8; |
| } |
| } |
| } |
| if (fIsLCD) { |
| key |= 0x10; |
| } |
| b->add32(key); |
| this->onAddToKey(caps, b); |
| } |
| |
| #ifdef SK_DEBUG |
| static const char* equation_string(GrBlendEquation eq) { |
| switch (eq) { |
| case kAdd_GrBlendEquation: |
| return "add"; |
| case kSubtract_GrBlendEquation: |
| return "subtract"; |
| case kReverseSubtract_GrBlendEquation: |
| return "reverse_subtract"; |
| case kScreen_GrBlendEquation: |
| return "screen"; |
| case kOverlay_GrBlendEquation: |
| return "overlay"; |
| case kDarken_GrBlendEquation: |
| return "darken"; |
| case kLighten_GrBlendEquation: |
| return "lighten"; |
| case kColorDodge_GrBlendEquation: |
| return "color_dodge"; |
| case kColorBurn_GrBlendEquation: |
| return "color_burn"; |
| case kHardLight_GrBlendEquation: |
| return "hard_light"; |
| case kSoftLight_GrBlendEquation: |
| return "soft_light"; |
| case kDifference_GrBlendEquation: |
| return "difference"; |
| case kExclusion_GrBlendEquation: |
| return "exclusion"; |
| case kMultiply_GrBlendEquation: |
| return "multiply"; |
| case kHSLHue_GrBlendEquation: |
| return "hsl_hue"; |
| case kHSLSaturation_GrBlendEquation: |
| return "hsl_saturation"; |
| case kHSLColor_GrBlendEquation: |
| return "hsl_color"; |
| case kHSLLuminosity_GrBlendEquation: |
| return "hsl_luminosity"; |
| case kIllegal_GrBlendEquation: |
| SkASSERT(false); |
| return "<illegal>"; |
| } |
| return ""; |
| } |
| |
| static const char* coeff_string(GrBlendCoeff coeff) { |
| switch (coeff) { |
| case kZero_GrBlendCoeff: |
| return "zero"; |
| case kOne_GrBlendCoeff: |
| return "one"; |
| case kSC_GrBlendCoeff: |
| return "src_color"; |
| case kISC_GrBlendCoeff: |
| return "inv_src_color"; |
| case kDC_GrBlendCoeff: |
| return "dst_color"; |
| case kIDC_GrBlendCoeff: |
| return "inv_dst_color"; |
| case kSA_GrBlendCoeff: |
| return "src_alpha"; |
| case kISA_GrBlendCoeff: |
| return "inv_src_alpha"; |
| case kDA_GrBlendCoeff: |
| return "dst_alpha"; |
| case kIDA_GrBlendCoeff: |
| return "inv_dst_alpha"; |
| case kConstC_GrBlendCoeff: |
| return "const_color"; |
| case kIConstC_GrBlendCoeff: |
| return "inv_const_color"; |
| case kS2C_GrBlendCoeff: |
| return "src2_color"; |
| case kIS2C_GrBlendCoeff: |
| return "inv_src2_color"; |
| case kS2A_GrBlendCoeff: |
| return "src2_alpha"; |
| case kIS2A_GrBlendCoeff: |
| return "inv_src2_alpha"; |
| case kIllegal_GrBlendCoeff: |
| SkASSERT(false); |
| return "<illegal>"; |
| } |
| return ""; |
| } |
| |
| SkString GrXferProcessor::BlendInfo::dump() const { |
| SkString out; |
| out.printf("write_color(%d) equation(%s) src_coeff(%s) dst_coeff:(%s) const(0x%08x)", |
| fWriteColor, equation_string(fEquation), coeff_string(fSrcBlend), |
| coeff_string(fDstBlend), fBlendConstant.toBytes_RGBA()); |
| return out; |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrXPFactory::AnalysisProperties GrXPFactory::GetAnalysisProperties( |
| const GrXPFactory* factory, |
| const GrProcessorAnalysisColor& color, |
| const GrProcessorAnalysisCoverage& coverage, |
| const GrCaps& caps, |
| GrClampType clampType) { |
| AnalysisProperties result; |
| if (factory) { |
| result = factory->analysisProperties(color, coverage, caps, clampType); |
| } else { |
| result = GrPorterDuffXPFactory::SrcOverAnalysisProperties(color, coverage, caps, clampType); |
| } |
| if (coverage == GrProcessorAnalysisCoverage::kNone) { |
| result |= AnalysisProperties::kCompatibleWithCoverageAsAlpha; |
| } |
| SkASSERT(!(result & AnalysisProperties::kRequiresDstTexture)); |
| if ((result & AnalysisProperties::kReadsDstInShader) && |
| !caps.shaderCaps()->dstReadInShaderSupport()) { |
| result |= AnalysisProperties::kRequiresDstTexture | |
| AnalysisProperties::kRequiresNonOverlappingDraws; |
| } |
| return result; |
| } |
| |
| sk_sp<const GrXferProcessor> GrXPFactory::MakeXferProcessor(const GrXPFactory* factory, |
| const GrProcessorAnalysisColor& color, |
| GrProcessorAnalysisCoverage coverage, |
| const GrCaps& caps, |
| GrClampType clampType) { |
| if (factory) { |
| return factory->makeXferProcessor(color, coverage, caps, clampType); |
| } else { |
| return GrPorterDuffXPFactory::MakeSrcOverXferProcessor(color, coverage, caps); |
| } |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| using ProgramImpl = GrXferProcessor::ProgramImpl; |
| |
| // This is only called for cases where we are doing LCD coverage and not using in shader blending. |
| // For these cases we assume the the src alpha is 1, thus we can just use the max for the alpha |
| // coverage since src alpha will always be greater than or equal to dst alpha. |
| static void adjust_for_lcd_coverage(GrGLSLXPFragmentBuilder* fragBuilder, |
| const char* srcCoverage, |
| const GrXferProcessor& proc) { |
| if (srcCoverage && proc.isLCD()) { |
| fragBuilder->codeAppendf("%s.a = max(max(%s.r, %s.g), %s.b);", |
| srcCoverage, |
| srcCoverage, |
| srcCoverage, |
| srcCoverage); |
| } |
| } |
| |
| void ProgramImpl::emitCode(const EmitArgs& args) { |
| if (!args.fXP.willReadDstColor()) { |
| adjust_for_lcd_coverage(args.fXPFragBuilder, args.fInputCoverage, args.fXP); |
| this->emitOutputsForBlendState(args); |
| } else { |
| GrGLSLXPFragmentBuilder* fragBuilder = args.fXPFragBuilder; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| const char* dstColor = fragBuilder->dstColor(); |
| |
| bool needsLocalOutColor = false; |
| |
| if (args.fDstTextureSamplerHandle.isValid()) { |
| if (args.fInputCoverage) { |
| // We don't think any shaders actually output negative coverage, but just as a |
| // safety check for floating point precision errors, we compare with <= here. We |
| // just check the RGB values of the coverage, since the alpha may not have been set |
| // when using LCD. If we are using single-channel coverage, alpha will be equal to |
| // RGB anyway. |
| // |
| // The discard here also helps for batching text-draws together, which need to read |
| // from a dst copy for blends. However, this only helps the case where the outer |
| // bounding boxes of each letter overlap and not two actually parts of the text. |
| fragBuilder->codeAppendf("if (all(lessThanEqual(%s.rgb, half3(0)))) {" |
| " discard;" |
| "}", |
| args.fInputCoverage); |
| } |
| } else { |
| needsLocalOutColor = args.fShaderCaps->requiresLocalOutputColorForFBFetch(); |
| } |
| |
| const char* outColor = "_localColorOut"; |
| if (!needsLocalOutColor) { |
| outColor = args.fOutputPrimary; |
| } else { |
| fragBuilder->codeAppendf("half4 %s;", outColor); |
| } |
| |
| this->emitBlendCodeForDstRead(fragBuilder, |
| uniformHandler, |
| args.fInputColor, |
| args.fInputCoverage, |
| dstColor, |
| outColor, |
| args.fOutputSecondary, |
| args.fXP); |
| if (needsLocalOutColor) { |
| fragBuilder->codeAppendf("%s = %s;", args.fOutputPrimary, outColor); |
| } |
| } |
| |
| // Swizzle the fragment shader outputs if necessary. |
| this->emitWriteSwizzle(args.fXPFragBuilder, |
| args.fWriteSwizzle, |
| args.fOutputPrimary, |
| args.fOutputSecondary); |
| } |
| |
| void ProgramImpl::emitWriteSwizzle(GrGLSLXPFragmentBuilder* x, |
| const GrSwizzle& swizzle, |
| const char* outColor, |
| const char* outColorSecondary) const { |
| if (GrSwizzle::RGBA() != swizzle) { |
| x->codeAppendf("%s = %s.%s;", outColor, outColor, swizzle.asString().c_str()); |
| if (outColorSecondary) { |
| x->codeAppendf("%s = %s.%s;", |
| outColorSecondary, |
| outColorSecondary, |
| swizzle.asString().c_str()); |
| } |
| } |
| } |
| |
| void ProgramImpl::setData(const GrGLSLProgramDataManager& pdm, const GrXferProcessor& xp) { |
| this->onSetData(pdm, xp); |
| } |
| |
| void ProgramImpl::DefaultCoverageModulation(GrGLSLXPFragmentBuilder* fragBuilder, |
| const char* srcCoverage, |
| const char* dstColor, |
| const char* outColor, |
| const char* outColorSecondary, |
| const GrXferProcessor& proc) { |
| if (srcCoverage) { |
| if (proc.isLCD()) { |
| fragBuilder->codeAppendf("half3 lerpRGB = mix(%s.aaa, %s.aaa, %s.rgb);", |
| dstColor, |
| outColor, |
| srcCoverage); |
| } |
| fragBuilder->codeAppendf("%s = %s * %s + (half4(1.0) - %s) * %s;", |
| outColor, |
| srcCoverage, |
| outColor, |
| srcCoverage, |
| dstColor); |
| if (proc.isLCD()) { |
| fragBuilder->codeAppendf("%s.a = max(max(lerpRGB.r, lerpRGB.b), lerpRGB.g);", outColor); |
| } |
| } |
| } |
