| /* |
| * 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 GrCCTriangleShader_DEFINED |
| #define GrCCTriangleShader_DEFINED |
| |
| #include "ccpr/GrCCCoverageProcessor.h" |
| |
| /** |
| * Steps 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. The Impl may choose to |
| * implement these steps in either one or two actual render passes. |
| */ |
| class GrCCTriangleShader : public GrCCCoverageProcessor::Shader { |
| void onEmitVaryings(GrGLSLVaryingHandler*, GrGLSLVarying::Scope, SkString* code, |
| const char* position, const char* inputCoverage, const char* wind) override; |
| void onEmitFragmentCode(GrGLSLFPFragmentBuilder*, const char* outputCoverage) const override; |
| |
| GrGLSLVarying fCoverageTimesWind; |
| }; |
| |
| /** |
| * Step 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 GrCCTriangleCornerShader : public GrCCCoverageProcessor::Shader { |
| void emitSetupCode(GrGLSLVertexGeoBuilder*, const char* pts, const char* repetitionID, |
| const char* wind, GeometryVars*) const override; |
| void onEmitVaryings(GrGLSLVaryingHandler*, GrGLSLVarying::Scope, SkString* code, |
| const char* position, const char* inputCoverage, const char* wind) override; |
| void onEmitFragmentCode(GrGLSLFPFragmentBuilder* 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; |
| GrGLSLVarying fBisectInAABoxes; |
| GrGLSLVarying fWindTimesHalf; |
| }; |
| |
| #endif |