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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrCCPRTriangleShader_DEFINED
#define GrCCPRTriangleShader_DEFINED
#include "ccpr/GrCCPRCoverageProcessor.h"
/**
* Passes 1 & 2: Draw the triangle's conservative raster hull with a coverage of 1, then smooth the
* edges by drawing the conservative rasters of all 3 edges and interpolating from
* coverage=-1 on the outside to coverage=0 on the inside.
*/
class GrCCPRTriangleShader : public GrCCPRCoverageProcessor::Shader {
WindHandling onEmitVaryings(GrGLSLVaryingHandler*, SkString* code, const char* position,
const char* coverage, const char* wind) override;
void onEmitFragmentCode(GrGLSLPPFragmentBuilder*, const char* outputCoverage) const override;
GrGLSLVarying fCoverageTimesWind{kHalf_GrSLType, GrGLSLVarying::Scope::kGeoToFrag};
};
/**
* Pass 3: Touch up the corner pixels. Here we fix the simple distance-to-edge coverage analysis
* done previously so that it takes into account the region that is outside both edges at
* the same time.
*/
class GrCCPRTriangleCornerShader : public GrCCPRCoverageProcessor::Shader {
void emitSetupCode(GrGLSLVertexGeoBuilder*, const char* pts, const char* repetitionID,
const char* wind, GeometryVars*) const override;
WindHandling onEmitVaryings(GrGLSLVaryingHandler*, SkString* code, const char* position,
const char* coverage, const char* wind) override;
void onEmitFragmentCode(GrGLSLPPFragmentBuilder* f, const char* outputCoverage) const override;
GrShaderVar fAABoxMatrices{"aa_box_matrices", kFloat2x2_GrSLType, 2};
GrShaderVar fAABoxTranslates{"aa_box_translates", kFloat2_GrSLType, 2};
GrShaderVar fGeoShaderBisects{"bisects", kFloat2_GrSLType, 2};
GrGLSLVarying fCornerLocationInAABoxes{kFloat2x2_GrSLType, GrGLSLVarying::Scope::kGeoToFrag};
GrGLSLVarying fBisectInAABoxes{kFloat2x2_GrSLType, GrGLSLVarying::Scope::kGeoToFrag};
};
#endif
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