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- /*
- * 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/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("half distance = shadowParams.z * (1.0 - d);");
- fragBuilder->codeAppend("half factor = 1.0 - clamp(distance, 0.0, 1.0);");
- fragBuilder->codeAppend("factor = exp(-factor * factor * 4.0) - 0.018;");
- fragBuilder->codeAppendf("%s = half4(factor);",
- args.fOutputCoverage);
- }
- void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& proc,
- FPCoordTransformIter&& transformIter) override {
- this->setTransformDataHelper(SkMatrix::I(), pdman, &transformIter);
- }
- private:
- typedef GrGLSLGeometryProcessor INHERITED;
- };
- ///////////////////////////////////////////////////////////////////////////////
- GrRRectShadowGeoProc::GrRRectShadowGeoProc() : 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);
- }
- GrGLSLPrimitiveProcessor* GrRRectShadowGeoProc::createGLSLInstance(const GrShaderCaps&) const {
- return new GrGLSLRRectShadowGeoProc();
- }
- ///////////////////////////////////////////////////////////////////////////////
- GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrRRectShadowGeoProc);
- #if GR_TEST_UTILS
- sk_sp<GrGeometryProcessor> GrRRectShadowGeoProc::TestCreate(GrProcessorTestData* d) {
- return GrRRectShadowGeoProc::Make();
- }
- #endif
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