1/*
2 * Copyright 2019 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef GrGSCoverageProcessor_DEFINED
9#define GrGSCoverageProcessor_DEFINED
10
11#include "src/gpu/ccpr/GrCCCoverageProcessor.h"
12
13/**
14 * This class implements GrCCCoverageProcessor with analytic coverage using geometry shaders.
15 */
16class GrGSCoverageProcessor : public GrCCCoverageProcessor {
17public:
18 GrGSCoverageProcessor() : GrCCCoverageProcessor(kGrGSCoverageProcessor_ClassID) {
19 this->setWillUseGeoShader();
20 }
21
22private:
23 void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const override {
24 SkDEBUGCODE(this->getDebugBloatKey(b));
25 b->add32(((int)fPrimitiveType << 16) | (int)fSubpass);
26 }
27
28 GrPrimitiveType primType() const final { return GrPrimitiveType::kLines; }
29 int numSubpasses() const override { return 2; }
30 void reset(PrimitiveType, int subpassIdx, GrResourceProvider*) override;
31 void bindBuffers(GrOpsRenderPass*, const GrBuffer* instanceBuffer) const override;
32 void drawInstances(GrOpsRenderPass*, int instanceCount, int baseInstance) const override;
33
34 GrGLSLPrimitiveProcessor* onCreateGLSLInstance(std::unique_ptr<Shader>) const override;
35
36 // The geometry shader impl draws primitives in two subpasses. The first pass fills the interior
37 // and does edge AA. The second pass does touch up on corner pixels.
38 enum class Subpass : bool {
39 kHulls,
40 kCorners
41 };
42
43 Attribute fInputXOrYValues;
44 mutable Subpass fSubpass = Subpass::kHulls;
45
46 class Impl;
47 class TriangleHullImpl;
48 class CurveHullImpl;
49 class CornerImpl;
50
51 typedef GrCCCoverageProcessor INHERITED;
52};
53
54#endif
55