| /* |
| * Copyright 2016 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/ganesh/effects/GrShadowGeoProc.h" |
| |
| #include "include/core/SkSamplingOptions.h" |
| #include "include/private/base/SkAssert.h" |
| #include "include/private/gpu/ganesh/GrTypesPriv.h" |
| #include "src/core/SkSLTypeShared.h" |
| #include "src/gpu/ganesh/GrSamplerState.h" |
| #include "src/gpu/ganesh/GrSurfaceProxy.h" |
| #include "src/gpu/ganesh/GrSurfaceProxyView.h" |
| #include "src/gpu/ganesh/glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "src/gpu/ganesh/glsl/GrGLSLVarying.h" |
| |
| class GrGLSLProgramDataManager; |
| class GrGLSLVertexBuilder; |
| struct GrShaderCaps; |
| |
| class GrRRectShadowGeoProc::Impl : public ProgramImpl { |
| public: |
| void setData(const GrGLSLProgramDataManager&, |
| const GrShaderCaps&, |
| const GrGeometryProcessor&) override {} |
| |
| private: |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override { |
| const GrRRectShadowGeoProc& rsgp = args.fGeomProc.cast<GrRRectShadowGeoProc>(); |
| GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| |
| // emit attributes |
| varyingHandler->emitAttributes(rsgp); |
| fragBuilder->codeAppend("half3 shadowParams;"); |
| varyingHandler->addPassThroughAttribute(rsgp.inShadowParams().asShaderVar(), |
| "shadowParams"); |
| |
| // setup pass through color |
| fragBuilder->codeAppendf("half4 %s;", args.fOutputColor); |
| varyingHandler->addPassThroughAttribute(rsgp.inColor().asShaderVar(), args.fOutputColor); |
| |
| // Setup position |
| WriteOutputPosition(vertBuilder, gpArgs, rsgp.inPosition().name()); |
| // No need for local coordinates, this GP does not combine with fragment processors |
| |
| fragBuilder->codeAppend("half d = length(shadowParams.xy);"); |
| fragBuilder->codeAppend("float2 uv = float2(shadowParams.z * (1.0 - d), 0.5);"); |
| fragBuilder->codeAppend("half factor = "); |
| fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv"); |
| fragBuilder->codeAppend(".a;"); |
| fragBuilder->codeAppendf("half4 %s = half4(factor);", args.fOutputCoverage); |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrRRectShadowGeoProc::GrRRectShadowGeoProc(const GrSurfaceProxyView& lutView) |
| : INHERITED(kGrRRectShadowGeoProc_ClassID) { |
| fInPosition = {"inPosition", kFloat2_GrVertexAttribType, SkSLType::kFloat2}; |
| fInColor = {"inColor", kUByte4_norm_GrVertexAttribType, SkSLType::kHalf4}; |
| fInShadowParams = {"inShadowParams", kFloat3_GrVertexAttribType, SkSLType::kHalf3}; |
| this->setVertexAttributesWithImplicitOffsets(&fInPosition, 3); |
| |
| SkASSERT(lutView.proxy()); |
| fLUTTextureSampler.reset(GrSamplerState::Filter::kLinear, lutView.proxy()->backendFormat(), |
| lutView.swizzle()); |
| this->setTextureSamplerCnt(1); |
| } |
| |
| std::unique_ptr<GrGeometryProcessor::ProgramImpl> GrRRectShadowGeoProc::makeProgramImpl( |
| const GrShaderCaps&) const { |
| return std::make_unique<Impl>(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrRRectShadowGeoProc) |
| |
| #if defined(GR_TEST_UTILS) |
| GrGeometryProcessor* GrRRectShadowGeoProc::TestCreate(GrProcessorTestData* d) { |
| auto [view, ct, at] = d->randomAlphaOnlyView(); |
| |
| return GrRRectShadowGeoProc::Make(d->allocator(), view); |
| } |
| #endif |