1 /*
2 * Copyright 2020 Google LLC
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 "include/core/SkAlphaType.h"
9 #include "include/core/SkBlendMode.h"
10 #include "include/core/SkColorSpace.h"
11 #include "include/core/SkColorType.h"
12 #include "include/core/SkImageInfo.h"
13 #include "include/core/SkMatrix.h"
14 #include "include/core/SkPoint.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkSurfaceProps.h"
17 #include "include/core/SkTypes.h"
18 #include "include/gpu/GrDirectContext.h"
19 #include "include/private/SkColorData.h"
20 #include "include/private/gpu/ganesh/GrTypesPriv.h"
21 #include "src/core/SkSLTypeShared.h"
22 #include "src/gpu/SkBackingFit.h"
23 #include "src/gpu/ganesh/GrColor.h"
24 #include "src/gpu/ganesh/GrFragmentProcessor.h"
25 #include "src/gpu/ganesh/GrImageInfo.h"
26 #include "src/gpu/ganesh/GrPaint.h"
27 #include "src/gpu/ganesh/GrPixmap.h"
28 #include "src/gpu/ganesh/SurfaceDrawContext.h"
29 #include "src/gpu/ganesh/glsl/GrGLSLFragmentShaderBuilder.h"
30 #include "src/gpu/ganesh/glsl/GrGLSLProgramDataManager.h"
31 #include "src/gpu/ganesh/glsl/GrGLSLUniformHandler.h"
32 #include "tests/CtsEnforcement.h"
33 #include "tests/Test.h"
34
35 #include <memory>
36 #include <utility>
37
38 namespace skgpu { class KeyBuilder; }
39 struct GrContextOptions;
40 struct GrShaderCaps;
41
42 static void run_test(skiatest::Reporter*, GrDirectContext*,
43 skgpu::v1::SurfaceDrawContext*, SkVector a,
44 SkVector b, float expectedCrossProduct);
45
46 // This is a GPU test that ensures the SkSL 2d cross() intrinsic returns the correct sign (negative,
47 // positive, or zero).
DEF_GANESH_TEST_FOR_RENDERING_CONTEXTS(SkSLCross,reporter,ctxInfo,CtsEnforcement::kApiLevel_T)48 DEF_GANESH_TEST_FOR_RENDERING_CONTEXTS(SkSLCross, reporter, ctxInfo, CtsEnforcement::kApiLevel_T) {
49 GrDirectContext* dContext = ctxInfo.directContext();
50 auto sdc = skgpu::v1::SurfaceDrawContext::Make(dContext, GrColorType::kRGBA_8888, nullptr,
51 SkBackingFit::kExact, {1, 1}, SkSurfaceProps(),
52 /*label=*/"SkSLCross_Test");
53 if (!sdc) {
54 ERRORF(reporter, "could not create render target context.");
55 return;
56 }
57 run_test(reporter, dContext, sdc.get(), {3,4}, {5,6}, -2); // Negative.
58 run_test(reporter, dContext, sdc.get(), {3,4}, {-5,-6}, 2); // Positive.
59 run_test(reporter, dContext, sdc.get(), {0, 2.287f}, {0, -7.741f}, 0); // Zero.
60 run_test(reporter, dContext, sdc.get(), {62.17f, 0}, {-43.49f, 0}, 0); // Zero.
61 }
62
63 namespace {
64
65 // Outputs:
66 // Green if cross(a,b) > 0
67 // Red if cross(a,b) < 0
68 // Black if cross(a,b) == 0
69 class VisualizeCrossProductSignFP : public GrFragmentProcessor {
70 public:
VisualizeCrossProductSignFP(SkVector a,SkVector b)71 VisualizeCrossProductSignFP(SkVector a, SkVector b)
72 : GrFragmentProcessor(kTestFP_ClassID, kPreservesOpaqueInput_OptimizationFlag)
73 , fA(a), fB(b) {
74 }
75
name() const76 const char* name() const override { return "VisualizeCrossProductSignFP"; }
77
clone() const78 std::unique_ptr<GrFragmentProcessor> clone() const override {
79 return std::unique_ptr<GrFragmentProcessor>(new VisualizeCrossProductSignFP(fA, fB));
80 }
81
82 private:
onAddToKey(const GrShaderCaps &,skgpu::KeyBuilder *) const83 void onAddToKey(const GrShaderCaps&, skgpu::KeyBuilder*) const override {}
onIsEqual(const GrFragmentProcessor &) const84 bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
85
onMakeProgramImpl() const86 std::unique_ptr<ProgramImpl> onMakeProgramImpl() const override {
87 class Impl : public ProgramImpl {
88 public:
89 void emitCode(EmitArgs& args) override {
90 auto& fp = args.fFp.cast<VisualizeCrossProductSignFP>();
91 const char *a, *b;
92 fAUniform = args.fUniformHandler->addUniform(&fp, kFragment_GrShaderFlag,
93 SkSLType::kFloat2, "a", &a);
94 fBUniform = args.fUniformHandler->addUniform(&fp, kFragment_GrShaderFlag,
95 SkSLType::kFloat2, "b", &b);
96 args.fFragBuilder->codeAppendf(R"(
97 float crossProduct = cross_length_2d(%s, %s);
98 float2 visualization = clamp(float2(-sign(crossProduct), sign(crossProduct)),
99 float2(0), float2(1));
100 return half2(visualization).xy01;)", a, b);
101 }
102
103 private:
104 void onSetData(const GrGLSLProgramDataManager& pdman,
105 const GrFragmentProcessor& processor) override {
106 const auto& fp = processor.cast<VisualizeCrossProductSignFP>();
107 pdman.set2f(fAUniform, fp.fA.x(), fp.fA.y());
108 pdman.set2f(fBUniform, fp.fB.x(), fp.fB.y());
109 }
110 GrGLSLUniformHandler::UniformHandle fAUniform;
111 GrGLSLUniformHandler::UniformHandle fBUniform;
112 };
113
114 return std::make_unique<Impl>();
115 }
116 const SkVector fA, fB;
117 };
118
119 } // namespace
120
run_test(skiatest::Reporter * reporter,GrDirectContext * directContext,skgpu::v1::SurfaceDrawContext * sdc,SkVector a,SkVector b,float expectedCrossProduct)121 static void run_test(skiatest::Reporter* reporter, GrDirectContext* directContext,
122 skgpu::v1::SurfaceDrawContext* sdc, SkVector a, SkVector b,
123 float expectedCrossProduct) {
124 SkASSERT(sdc->width() == 1);
125 SkASSERT(sdc->height() == 1);
126
127 sdc->clear(SkPMColor4f::FromBytes_RGBA(0xbaaaaaad));
128
129 GrPaint crossPaint;
130 crossPaint.setColor4f(SK_PMColor4fWHITE);
131 crossPaint.setPorterDuffXPFactory(SkBlendMode::kSrcOver);
132 crossPaint.setColorFragmentProcessor(std::make_unique<VisualizeCrossProductSignFP>(a, b));
133 sdc->drawRect(/*clip=*/nullptr, std::move(crossPaint), GrAA::kNo, SkMatrix::I(),
134 SkRect::MakeWH(1,1));
135
136 GrColor result;
137 GrPixmap resultPM(SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kPremul_SkAlphaType),
138 &result,
139 sizeof(GrColor));
140 sdc->readPixels(directContext, resultPM, {0, 0});
141
142 SkASSERT(expectedCrossProduct == a.cross(b));
143 if (expectedCrossProduct > 0) {
144 REPORTER_ASSERT(reporter, result == GrColorPackRGBA(0, 255, 0, 255)); // Green.
145 } else if (expectedCrossProduct < 0) {
146 REPORTER_ASSERT(reporter, result == GrColorPackRGBA(255, 0, 0, 255)); // Red.
147 } else {
148 REPORTER_ASSERT(reporter, result == GrColorPackRGBA(0, 0, 0, 255)); // Black.
149 }
150 }
151