1/*
2 * Copyright 2016 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#include "src/gpu/effects/GrShadowGeoProc.h"
9
10#include "src/gpu/GrSurfaceProxyView.h"
11#include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
12#include "src/gpu/glsl/GrGLSLGeometryProcessor.h"
13#include "src/gpu/glsl/GrGLSLUniformHandler.h"
14#include "src/gpu/glsl/GrGLSLVarying.h"
15#include "src/gpu/glsl/GrGLSLVertexGeoBuilder.h"
16
17class GrGLSLRRectShadowGeoProc : public GrGLSLGeometryProcessor {
18public:
19 GrGLSLRRectShadowGeoProc() {}
20
21 void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
22 const GrRRectShadowGeoProc& rsgp = args.fGP.cast<GrRRectShadowGeoProc>();
23 GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
24 GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
25 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
26
27 // emit attributes
28 varyingHandler->emitAttributes(rsgp);
29 fragBuilder->codeAppend("half3 shadowParams;");
30 varyingHandler->addPassThroughAttribute(rsgp.inShadowParams(), "shadowParams");
31
32 // setup pass through color
33 varyingHandler->addPassThroughAttribute(rsgp.inColor(), args.fOutputColor);
34
35 // Setup position
36 this->writeOutputPosition(vertBuilder, gpArgs, rsgp.inPosition().name());
37 // No need for local coordinates, this GP does not combine with fragment processors
38
39 fragBuilder->codeAppend("half d = length(shadowParams.xy);");
40 fragBuilder->codeAppend("float2 uv = float2(shadowParams.z * (1.0 - d), 0.5);");
41 fragBuilder->codeAppend("half factor = ");
42 fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv");
43 fragBuilder->codeAppend(".a;");
44 fragBuilder->codeAppendf("%s = half4(factor);", args.fOutputCoverage);
45 }
46
47 void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& proc) override {
48 }
49
50private:
51 typedef GrGLSLGeometryProcessor INHERITED;
52};
53
54///////////////////////////////////////////////////////////////////////////////
55
56GrRRectShadowGeoProc::GrRRectShadowGeoProc(const GrSurfaceProxyView& lutView)
57 : INHERITED(kGrRRectShadowGeoProc_ClassID) {
58 fInPosition = {"inPosition", kFloat2_GrVertexAttribType, kFloat2_GrSLType};
59 fInColor = {"inColor", kUByte4_norm_GrVertexAttribType, kHalf4_GrSLType};
60 fInShadowParams = {"inShadowParams", kFloat3_GrVertexAttribType, kHalf3_GrSLType};
61 this->setVertexAttributes(&fInPosition, 3);
62
63 SkASSERT(lutView.proxy());
64 fLUTTextureSampler.reset(GrSamplerState::Filter::kLinear, lutView.proxy()->backendFormat(),
65 lutView.swizzle());
66 this->setTextureSamplerCnt(1);
67}
68
69GrGLSLPrimitiveProcessor* GrRRectShadowGeoProc::createGLSLInstance(const GrShaderCaps&) const {
70 return new GrGLSLRRectShadowGeoProc();
71}
72
73///////////////////////////////////////////////////////////////////////////////
74
75GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrRRectShadowGeoProc);
76
77#if GR_TEST_UTILS
78GrGeometryProcessor* GrRRectShadowGeoProc::TestCreate(GrProcessorTestData* d) {
79 auto [view, ct, at] = d->randomAlphaOnlyView();
80
81 return GrRRectShadowGeoProc::Make(d->allocator(), view);
82}
83#endif
84