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 "include/core/SkSamplingOptions.h"
11 #include "include/private/base/SkAssert.h"
12 #include "include/private/gpu/ganesh/GrTypesPriv.h"
13 #include "src/core/SkSLTypeShared.h"
14 #include "src/gpu/ganesh/GrSamplerState.h"
15 #include "src/gpu/ganesh/GrSurfaceProxy.h"
16 #include "src/gpu/ganesh/GrSurfaceProxyView.h"
17 #include "src/gpu/ganesh/glsl/GrGLSLFragmentShaderBuilder.h"
18 #include "src/gpu/ganesh/glsl/GrGLSLVarying.h"
19
20 class GrGLSLProgramDataManager;
21 class GrGLSLVertexBuilder;
22 struct GrShaderCaps;
23
24 class GrRRectShadowGeoProc::Impl : public ProgramImpl {
25 public:
setData(const GrGLSLProgramDataManager &,const GrShaderCaps &,const GrGeometryProcessor &)26 void setData(const GrGLSLProgramDataManager&,
27 const GrShaderCaps&,
28 const GrGeometryProcessor&) override {}
29
30 private:
onEmitCode(EmitArgs & args,GrGPArgs * gpArgs)31 void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
32 const GrRRectShadowGeoProc& rsgp = args.fGeomProc.cast<GrRRectShadowGeoProc>();
33 GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
34 GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
35 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
36
37 // emit attributes
38 varyingHandler->emitAttributes(rsgp);
39 fragBuilder->codeAppend("half3 shadowParams;");
40 varyingHandler->addPassThroughAttribute(rsgp.inShadowParams().asShaderVar(),
41 "shadowParams");
42
43 // setup pass through color
44 fragBuilder->codeAppendf("half4 %s;", args.fOutputColor);
45 varyingHandler->addPassThroughAttribute(rsgp.inColor().asShaderVar(), args.fOutputColor);
46
47 // Setup position
48 WriteOutputPosition(vertBuilder, gpArgs, rsgp.inPosition().name());
49 // No need for local coordinates, this GP does not combine with fragment processors
50
51 fragBuilder->codeAppend("half d = length(shadowParams.xy);");
52 fragBuilder->codeAppend("float2 uv = float2(shadowParams.z * (1.0 - d), 0.5);");
53 fragBuilder->codeAppend("half factor = ");
54 fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv");
55 fragBuilder->codeAppend(".a;");
56 fragBuilder->codeAppendf("half4 %s = half4(factor);", args.fOutputCoverage);
57 }
58 };
59
60 ///////////////////////////////////////////////////////////////////////////////
61
GrRRectShadowGeoProc(const GrSurfaceProxyView & lutView)62 GrRRectShadowGeoProc::GrRRectShadowGeoProc(const GrSurfaceProxyView& lutView)
63 : INHERITED(kGrRRectShadowGeoProc_ClassID) {
64 fInPosition = {"inPosition", kFloat2_GrVertexAttribType, SkSLType::kFloat2};
65 fInColor = {"inColor", kUByte4_norm_GrVertexAttribType, SkSLType::kHalf4};
66 fInShadowParams = {"inShadowParams", kFloat3_GrVertexAttribType, SkSLType::kHalf3};
67 this->setVertexAttributesWithImplicitOffsets(&fInPosition, 3);
68
69 SkASSERT(lutView.proxy());
70 fLUTTextureSampler.reset(GrSamplerState::Filter::kLinear, lutView.proxy()->backendFormat(),
71 lutView.swizzle());
72 this->setTextureSamplerCnt(1);
73 }
74
makeProgramImpl(const GrShaderCaps &) const75 std::unique_ptr<GrGeometryProcessor::ProgramImpl> GrRRectShadowGeoProc::makeProgramImpl(
76 const GrShaderCaps&) const {
77 return std::make_unique<Impl>();
78 }
79
80 ///////////////////////////////////////////////////////////////////////////////
81
GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrRRectShadowGeoProc)82 GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrRRectShadowGeoProc)
83
84 #if defined(GPU_TEST_UTILS)
85 GrGeometryProcessor* GrRRectShadowGeoProc::TestCreate(GrProcessorTestData* d) {
86 auto [view, ct, at] = d->randomAlphaOnlyView();
87
88 return GrRRectShadowGeoProc::Make(d->allocator(), view);
89 }
90 #endif
91