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/ganesh/effects/GrShadowGeoProc.h"
9
10 #include "src/gpu/ganesh/GrSurfaceProxy.h"
11 #include "src/gpu/ganesh/GrSurfaceProxyView.h"
12 #include "src/gpu/ganesh/glsl/GrGLSLFragmentShaderBuilder.h"
13 #include "src/gpu/ganesh/glsl/GrGLSLUniformHandler.h"
14 #include "src/gpu/ganesh/glsl/GrGLSLVarying.h"
15 #include "src/gpu/ganesh/glsl/GrGLSLVertexGeoBuilder.h"
16
17 class GrRRectShadowGeoProc::Impl : public ProgramImpl {
18 public:
setData(const GrGLSLProgramDataManager &,const GrShaderCaps &,const GrGeometryProcessor &)19 void setData(const GrGLSLProgramDataManager&,
20 const GrShaderCaps&,
21 const GrGeometryProcessor&) override {}
22
23 private:
onEmitCode(EmitArgs & args,GrGPArgs * gpArgs)24 void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
25 const GrRRectShadowGeoProc& rsgp = args.fGeomProc.cast<GrRRectShadowGeoProc>();
26 GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
27 GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
28 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
29
30 // emit attributes
31 varyingHandler->emitAttributes(rsgp);
32 fragBuilder->codeAppend("half3 shadowParams;");
33 varyingHandler->addPassThroughAttribute(rsgp.inShadowParams().asShaderVar(),
34 "shadowParams");
35
36 // setup pass through color
37 fragBuilder->codeAppendf("half4 %s;", args.fOutputColor);
38 varyingHandler->addPassThroughAttribute(rsgp.inColor().asShaderVar(), args.fOutputColor);
39
40 // Setup position
41 WriteOutputPosition(vertBuilder, gpArgs, rsgp.inPosition().name());
42 // No need for local coordinates, this GP does not combine with fragment processors
43
44 fragBuilder->codeAppend("half d = length(shadowParams.xy);");
45 fragBuilder->codeAppend("float2 uv = float2(shadowParams.z * (1.0 - d), 0.5);");
46 fragBuilder->codeAppend("half factor = ");
47 fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv");
48 fragBuilder->codeAppend(".a;");
49 fragBuilder->codeAppendf("half4 %s = half4(factor);", args.fOutputCoverage);
50 }
51 };
52
53 ///////////////////////////////////////////////////////////////////////////////
54
GrRRectShadowGeoProc(const GrSurfaceProxyView & lutView)55 GrRRectShadowGeoProc::GrRRectShadowGeoProc(const GrSurfaceProxyView& lutView)
56 : INHERITED(kGrRRectShadowGeoProc_ClassID) {
57 fInPosition = {"inPosition", kFloat2_GrVertexAttribType, SkSLType::kFloat2};
58 fInColor = {"inColor", kUByte4_norm_GrVertexAttribType, SkSLType::kHalf4};
59 fInShadowParams = {"inShadowParams", kFloat3_GrVertexAttribType, SkSLType::kHalf3};
60 this->setVertexAttributesWithImplicitOffsets(&fInPosition, 3);
61
62 SkASSERT(lutView.proxy());
63 fLUTTextureSampler.reset(GrSamplerState::Filter::kLinear, lutView.proxy()->backendFormat(),
64 lutView.swizzle());
65 this->setTextureSamplerCnt(1);
66 }
67
makeProgramImpl(const GrShaderCaps &) const68 std::unique_ptr<GrGeometryProcessor::ProgramImpl> GrRRectShadowGeoProc::makeProgramImpl(
69 const GrShaderCaps&) const {
70 return std::make_unique<Impl>();
71 }
72
73 ///////////////////////////////////////////////////////////////////////////////
74
GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrRRectShadowGeoProc)75 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrRRectShadowGeoProc)
76
77 #if GR_TEST_UTILS
78 GrGeometryProcessor* GrRRectShadowGeoProc::TestCreate(GrProcessorTestData* d) {
79 auto [view, ct, at] = d->randomAlphaOnlyView();
80
81 return GrRRectShadowGeoProc::Make(d->allocator(), view);
82 }
83 #endif
84