6f3015a562
This is a reland of 6bbf026b54
Original change's description:
> Add sk_Caps.builtinDeterminantSupport and use it in cross().
>
> This CL partially relands http://review.skia.org/321790.
>
> Change-Id: I26a1aefda8a01167783e6e7fa15a51aa35ee5d82
> Bug: skia:10819, skia:10810
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/323784
> Reviewed-by: Chris Dalton <csmartdalton@google.com>
> Commit-Queue: John Stiles <johnstiles@google.com>
Bug: skia:10819
Bug: skia:10810
Change-Id: I7731f93db07bc917707cbbe1daca2e5ce0f763d7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/324620
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
113 lines
4.8 KiB
C++
113 lines
4.8 KiB
C++
/*
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* Copyright 2020 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "tests/Test.h"
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#include "src/gpu/GrRenderTargetContext.h"
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#include "src/gpu/GrRenderTargetContextPriv.h"
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#include "src/gpu/glsl/GrGLSLFragmentProcessor.h"
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static void run_test(skiatest::Reporter*, GrDirectContext*, GrRenderTargetContext*, SkVector a,
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SkVector b, float expectedCrossProduct);
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// This is a GPU test that ensures the SkSL 2d cross() intrinsic returns the correct sign (negative,
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// positive, or zero).
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DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SkSLCross, reporter, ctxInfo) {
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GrDirectContext* directContext = ctxInfo.directContext();
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auto rtc = GrRenderTargetContext::Make(directContext, GrColorType::kRGBA_8888, nullptr,
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SkBackingFit::kExact, {1, 1});
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if (!rtc) {
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ERRORF(reporter, "could not create render target context.");
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return;
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}
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run_test(reporter, directContext, rtc.get(), {3,4}, {5,6}, -2); // Negative.
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run_test(reporter, directContext, rtc.get(), {3,4}, {-5,-6}, 2); // Positive.
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run_test(reporter, directContext, rtc.get(), {0, 2.287f}, {0, -7.741f}, 0); // Zero.
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run_test(reporter, directContext, rtc.get(), {62.17f, 0}, {-43.49f, 0}, 0); // Zero.
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}
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namespace {
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// Outputs:
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// Green if cross(a,b) > 0
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// Red if cross(a,b) < 0
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// Black if cross(a,b) == 0
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class VisualizeCrossProductSignFP : public GrFragmentProcessor {
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public:
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VisualizeCrossProductSignFP(SkVector a, SkVector b)
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: GrFragmentProcessor(kTestFP_ClassID, kPreservesOpaqueInput_OptimizationFlag)
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, fA(a), fB(b) {
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}
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private:
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const char* name() const override { return "VisualizeCrossProductSignFP"; }
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std::unique_ptr<GrFragmentProcessor> clone() const override {
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return std::unique_ptr<GrFragmentProcessor>(new VisualizeCrossProductSignFP(fA, fB));
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}
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void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {}
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bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
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class Impl : public GrGLSLFragmentProcessor {
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void emitCode(EmitArgs& args) override {
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auto& fp = args.fFp.cast<VisualizeCrossProductSignFP>();
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const char* a, *b;
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fAUniform = args.fUniformHandler->addUniform(&fp, kFragment_GrShaderFlag,
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GrSLType::kFloat2_GrSLType, "a", &a);
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fBUniform = args.fUniformHandler->addUniform(&fp, kFragment_GrShaderFlag,
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GrSLType::kFloat2_GrSLType, "b", &b);
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args.fFragBuilder->codeAppendf(R"(
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float crossProduct = cross(%s, %s);
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float2 visualization = clamp(float2(-sign(crossProduct), sign(crossProduct)),
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float2(0), float2(1));
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%s = half4(half2(visualization), 0, 1);)", a, b, args.fOutputColor);
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}
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void onSetData(const GrGLSLProgramDataManager& pdman,
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const GrFragmentProcessor& processor) override {
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const auto& fp = processor.cast<VisualizeCrossProductSignFP>();
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pdman.set2f(fAUniform, fp.fA.x(), fp.fA.y());
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pdman.set2f(fBUniform, fp.fB.x(), fp.fB.y());
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}
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GrGLSLUniformHandler::UniformHandle fAUniform;
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GrGLSLUniformHandler::UniformHandle fBUniform;
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};
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GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new Impl; }
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const SkVector fA, fB;
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};
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} // namespace
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static void run_test(skiatest::Reporter* reporter, GrDirectContext* directContext,
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GrRenderTargetContext* rtc, SkVector a, SkVector b,
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float expectedCrossProduct) {
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SkASSERT(rtc->width() == 1);
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SkASSERT(rtc->height() == 1);
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rtc->clear(SkPMColor4f::FromBytes_RGBA(0xbaaaaaad));
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GrPaint crossPaint;
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crossPaint.setColor4f(SK_PMColor4fWHITE);
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crossPaint.setPorterDuffXPFactory(SkBlendMode::kSrcOver);
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crossPaint.setColorFragmentProcessor(std::make_unique<VisualizeCrossProductSignFP>(a, b));
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rtc->drawRect(/*clip=*/nullptr, std::move(crossPaint), GrAA::kNo, SkMatrix::I(),
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SkRect::MakeWH(1,1));
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GrColor result;
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rtc->readPixels(directContext,
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SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kPremul_SkAlphaType), &result,
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4, {0, 0});
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SkASSERT(expectedCrossProduct == a.cross(b));
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if (expectedCrossProduct > 0) {
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REPORTER_ASSERT(reporter, result == GrColorPackRGBA(0, 255, 0, 255)); // Green.
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} else if (expectedCrossProduct < 0) {
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REPORTER_ASSERT(reporter, result == GrColorPackRGBA(255, 0, 0, 255)); // Red.
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} else {
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REPORTER_ASSERT(reporter, result == GrColorPackRGBA(0, 0, 0, 255)); // Black.
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}
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}
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