| /* |
| * 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/effects/GrShadowGeoProc.h" |
| |
| #include "src/gpu/GrSurfaceProxyView.h" |
| #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "src/gpu/glsl/GrGLSLGeometryProcessor.h" |
| #include "src/gpu/glsl/GrGLSLUniformHandler.h" |
| #include "src/gpu/glsl/GrGLSLVarying.h" |
| #include "src/gpu/glsl/GrGLSLVertexGeoBuilder.h" |
| |
| class GrGLSLRRectShadowGeoProc : public GrGLSLGeometryProcessor { |
| public: |
| GrGLSLRRectShadowGeoProc() {} |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override { |
| const GrRRectShadowGeoProc& rsgp = args.fGP.cast<GrRRectShadowGeoProc>(); |
| GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder; |
| GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler; |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| |
| // emit attributes |
| varyingHandler->emitAttributes(rsgp); |
| fragBuilder->codeAppend("half3 shadowParams;"); |
| varyingHandler->addPassThroughAttribute(rsgp.inShadowParams(), "shadowParams"); |
| |
| // setup pass through color |
| varyingHandler->addPassThroughAttribute(rsgp.inColor(), args.fOutputColor); |
| |
| // Setup position |
| this->writeOutputPosition(vertBuilder, gpArgs, rsgp.inPosition().name()); |
| |
| // emit transforms |
| this->emitTransforms(vertBuilder, |
| varyingHandler, |
| uniformHandler, |
| rsgp.inPosition().asShaderVar(), |
| args.fFPCoordTransformHandler); |
| |
| 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", kFloat2_GrSLType); |
| fragBuilder->codeAppend(".a;"); |
| fragBuilder->codeAppendf("%s = half4(factor);", args.fOutputCoverage); |
| } |
| |
| void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& proc, |
| const CoordTransformRange& transformRange) override { |
| this->setTransformDataHelper(SkMatrix::I(), pdman, transformRange); |
| } |
| |
| private: |
| typedef GrGLSLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrRRectShadowGeoProc::GrRRectShadowGeoProc(const GrSurfaceProxyView& lutView) |
| : INHERITED(kGrRRectShadowGeoProc_ClassID) { |
| fInPosition = {"inPosition", kFloat2_GrVertexAttribType, kFloat2_GrSLType}; |
| fInColor = {"inColor", kUByte4_norm_GrVertexAttribType, kHalf4_GrSLType}; |
| fInShadowParams = {"inShadowParams", kFloat3_GrVertexAttribType, kHalf3_GrSLType}; |
| this->setVertexAttributes(&fInPosition, 3); |
| |
| SkASSERT(lutView.proxy()); |
| fLUTTextureSampler.reset(GrSamplerState::ClampBilerp(), lutView.proxy()->backendFormat(), |
| lutView.swizzle()); |
| this->setTextureSamplerCnt(1); |
| } |
| |
| GrGLSLPrimitiveProcessor* GrRRectShadowGeoProc::createGLSLInstance(const GrShaderCaps&) const { |
| return new GrGLSLRRectShadowGeoProc(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrRRectShadowGeoProc); |
| |
| #if GR_TEST_UTILS |
| GrGeometryProcessor* GrRRectShadowGeoProc::TestCreate(GrProcessorTestData* d) { |
| auto [proxy, ct, at] = d->randomAlphaOnlyProxy(); |
| GrSurfaceOrigin origin = proxy->origin(); |
| const GrSwizzle& swizzle = proxy->textureSwizzle(); |
| GrSurfaceProxyView view(std::move(proxy), origin, swizzle); |
| |
| return GrRRectShadowGeoProc::Make(d->allocator(), view); |
| } |
| #endif |