| /* |
| * Copyright 2020 Google LLC |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "tests/Test.h" |
| |
| #include "src/gpu/GrSurfaceDrawContext.h" |
| #include "src/gpu/glsl/GrGLSLFragmentProcessor.h" |
| |
| static void run_test(skiatest::Reporter*, GrDirectContext*, |
| GrSurfaceDrawContext*, SkVector a, |
| SkVector b, float expectedCrossProduct); |
| |
| // This is a GPU test that ensures the SkSL 2d cross() intrinsic returns the correct sign (negative, |
| // positive, or zero). |
| DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SkSLCross, reporter, ctxInfo) { |
| GrDirectContext* directContext = ctxInfo.directContext(); |
| auto rtc = GrSurfaceDrawContext::Make(directContext, GrColorType::kRGBA_8888, nullptr, |
| SkBackingFit::kExact, {1, 1}, SkSurfaceProps()); |
| if (!rtc) { |
| ERRORF(reporter, "could not create render target context."); |
| return; |
| } |
| run_test(reporter, directContext, rtc.get(), {3,4}, {5,6}, -2); // Negative. |
| run_test(reporter, directContext, rtc.get(), {3,4}, {-5,-6}, 2); // Positive. |
| run_test(reporter, directContext, rtc.get(), {0, 2.287f}, {0, -7.741f}, 0); // Zero. |
| run_test(reporter, directContext, rtc.get(), {62.17f, 0}, {-43.49f, 0}, 0); // Zero. |
| } |
| |
| namespace { |
| |
| // Outputs: |
| // Green if cross(a,b) > 0 |
| // Red if cross(a,b) < 0 |
| // Black if cross(a,b) == 0 |
| class VisualizeCrossProductSignFP : public GrFragmentProcessor { |
| public: |
| VisualizeCrossProductSignFP(SkVector a, SkVector b) |
| : GrFragmentProcessor(kTestFP_ClassID, kPreservesOpaqueInput_OptimizationFlag) |
| , fA(a), fB(b) { |
| } |
| |
| private: |
| const char* name() const override { return "VisualizeCrossProductSignFP"; } |
| std::unique_ptr<GrFragmentProcessor> clone() const override { |
| return std::unique_ptr<GrFragmentProcessor>(new VisualizeCrossProductSignFP(fA, fB)); |
| } |
| void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {} |
| bool onIsEqual(const GrFragmentProcessor&) const override { return true; } |
| |
| class Impl : public GrGLSLFragmentProcessor { |
| void emitCode(EmitArgs& args) override { |
| auto& fp = args.fFp.cast<VisualizeCrossProductSignFP>(); |
| const char* a, *b; |
| fAUniform = args.fUniformHandler->addUniform(&fp, kFragment_GrShaderFlag, |
| GrSLType::kFloat2_GrSLType, "a", &a); |
| fBUniform = args.fUniformHandler->addUniform(&fp, kFragment_GrShaderFlag, |
| GrSLType::kFloat2_GrSLType, "b", &b); |
| args.fFragBuilder->codeAppendf(R"( |
| float crossProduct = cross(%s, %s); |
| float2 visualization = clamp(float2(-sign(crossProduct), sign(crossProduct)), |
| float2(0), float2(1)); |
| return half2(visualization).xy01;)", a, b); |
| } |
| void onSetData(const GrGLSLProgramDataManager& pdman, |
| const GrFragmentProcessor& processor) override { |
| const auto& fp = processor.cast<VisualizeCrossProductSignFP>(); |
| pdman.set2f(fAUniform, fp.fA.x(), fp.fA.y()); |
| pdman.set2f(fBUniform, fp.fB.x(), fp.fB.y()); |
| } |
| GrGLSLUniformHandler::UniformHandle fAUniform; |
| GrGLSLUniformHandler::UniformHandle fBUniform; |
| }; |
| |
| std::unique_ptr<GrGLSLFragmentProcessor> onMakeProgramImpl() const override { |
| return std::make_unique<Impl>(); |
| } |
| const SkVector fA, fB; |
| }; |
| |
| } // namespace |
| |
| static void run_test(skiatest::Reporter* reporter, GrDirectContext* directContext, |
| GrSurfaceDrawContext* rtc, SkVector a, SkVector b, |
| float expectedCrossProduct) { |
| SkASSERT(rtc->width() == 1); |
| SkASSERT(rtc->height() == 1); |
| |
| rtc->clear(SkPMColor4f::FromBytes_RGBA(0xbaaaaaad)); |
| |
| GrPaint crossPaint; |
| crossPaint.setColor4f(SK_PMColor4fWHITE); |
| crossPaint.setPorterDuffXPFactory(SkBlendMode::kSrcOver); |
| crossPaint.setColorFragmentProcessor(std::make_unique<VisualizeCrossProductSignFP>(a, b)); |
| rtc->drawRect(/*clip=*/nullptr, std::move(crossPaint), GrAA::kNo, SkMatrix::I(), |
| SkRect::MakeWH(1,1)); |
| |
| GrColor result; |
| GrPixmap resultPM(SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kPremul_SkAlphaType), |
| &result, |
| sizeof(GrColor)); |
| rtc->readPixels(directContext, resultPM, {0, 0}); |
| |
| SkASSERT(expectedCrossProduct == a.cross(b)); |
| if (expectedCrossProduct > 0) { |
| REPORTER_ASSERT(reporter, result == GrColorPackRGBA(0, 255, 0, 255)); // Green. |
| } else if (expectedCrossProduct < 0) { |
| REPORTER_ASSERT(reporter, result == GrColorPackRGBA(255, 0, 0, 255)); // Red. |
| } else { |
| REPORTER_ASSERT(reporter, result == GrColorPackRGBA(0, 0, 0, 255)); // Black. |
| } |
| } |