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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 "GrShadowGeoProc.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLGeometryProcessor.h"
#include "glsl/GrGLSLUniformHandler.h"
#include "glsl/GrGLSLVarying.h"
#include "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("half4 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, shadowParams.w);");
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) {
this->setVertexAttributeCnt(3);
}
GrGLSLPrimitiveProcessor* GrRRectShadowGeoProc::createGLSLInstance(const GrShaderCaps&) const {
return new GrGLSLRRectShadowGeoProc();
}
///////////////////////////////////////////////////////////////////////////////
constexpr GrPrimitiveProcessor::Attribute GrRRectShadowGeoProc::kInPosition;
constexpr GrPrimitiveProcessor::Attribute GrRRectShadowGeoProc::kInColor;
constexpr GrPrimitiveProcessor::Attribute GrRRectShadowGeoProc::kInShadowParams;
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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