blob: 1f78ae0785b371ff864c6d2dc014848124e9125d [file] [log] [blame]
/*
* 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.
}
}