skia2/tests/GpuSampleLocationsTest.cpp

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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkTypes.h"
#include "SkPoint.h"
#include "Test.h"
#include <vector>
#if SK_SUPPORT_GPU
#include "GrRenderTargetPriv.h"
#include "gl/GrGLGpu.h"
#include "gl/debug/DebugGLTestContext.h"
typedef std::vector<SkPoint> SamplePattern;
static const SamplePattern kTestPatterns[] = {
SamplePattern{ // Intel on mac, msaa8, offscreen.
{0.562500, 0.312500},
{0.437500, 0.687500},
{0.812500, 0.562500},
{0.312500, 0.187500},
{0.187500, 0.812500},
{0.062500, 0.437500},
{0.687500, 0.937500},
{0.937500, 0.062500}
},
SamplePattern{ // Intel on mac, msaa8, on-screen.
{0.562500, 0.687500},
{0.437500, 0.312500},
{0.812500, 0.437500},
{0.312500, 0.812500},
{0.187500, 0.187500},
{0.062500, 0.562500},
{0.687500, 0.062500},
{0.937500, 0.937500}
},
SamplePattern{ // NVIDIA, msaa16.
{0.062500, 0.000000},
{0.250000, 0.125000},
{0.187500, 0.375000},
{0.437500, 0.312500},
{0.500000, 0.062500},
{0.687500, 0.187500},
{0.750000, 0.437500},
{0.937500, 0.250000},
{0.000000, 0.500000},
{0.312500, 0.625000},
{0.125000, 0.750000},
{0.375000, 0.875000},
{0.562500, 0.562500},
{0.812500, 0.687500},
{0.625000, 0.812500},
{0.875000, 0.937500}
},
SamplePattern{ // NVIDIA, mixed samples, 16:1.
{0.250000, 0.125000},
{0.625000, 0.812500},
{0.500000, 0.062500},
{0.812500, 0.687500},
{0.187500, 0.375000},
{0.875000, 0.937500},
{0.125000, 0.750000},
{0.750000, 0.437500},
{0.937500, 0.250000},
{0.312500, 0.625000},
{0.437500, 0.312500},
{0.000000, 0.500000},
{0.375000, 0.875000},
{0.687500, 0.187500},
{0.062500, 0.000000},
{0.562500, 0.562500}
}
};
constexpr int numTestPatterns = SK_ARRAY_COUNT(kTestPatterns);
class TestSampleLocationsInterface : public SkNoncopyable {
public:
virtual void overrideSamplePattern(const SamplePattern&) = 0;
virtual ~TestSampleLocationsInterface() {}
};
GrRenderTarget* SK_WARN_UNUSED_RESULT create_render_target(GrContext* ctx, GrSurfaceOrigin origin,
int numSamples) {
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fOrigin = origin;
desc.fWidth = 100;
desc.fHeight = 100;
desc.fConfig = kBGRA_8888_GrPixelConfig;
desc.fSampleCnt = numSamples;
return ctx->textureProvider()->createTexture(desc, SkBudgeted::kNo, 0, 0)->asRenderTarget();
}
void assert_equal(skiatest::Reporter* reporter, const SamplePattern& pattern,
const GrGpu::MultisampleSpecs& specs, bool flipY) {
GrAlwaysAssert(specs.fSampleLocations);
if ((int)pattern.size() != specs.fEffectiveSampleCnt) {
REPORTER_ASSERT_MESSAGE(reporter, false, "Sample pattern has wrong number of samples.");
return;
}
for (int i = 0; i < specs.fEffectiveSampleCnt; ++i) {
SkPoint expectedLocation = specs.fSampleLocations[i];
if (flipY) {
expectedLocation.fY = 1 - expectedLocation.fY;
}
if (pattern[i] != expectedLocation) {
REPORTER_ASSERT_MESSAGE(reporter, false, "Sample pattern has wrong sample location.");
return;
}
}
}
void test_sampleLocations(skiatest::Reporter* reporter, TestSampleLocationsInterface* testInterface,
GrContext* ctx) {
SkRandom rand;
SkAutoTUnref<GrRenderTarget> bottomUps[numTestPatterns];
SkAutoTUnref<GrRenderTarget> topDowns[numTestPatterns];
for (int i = 0; i < numTestPatterns; ++i) {
int numSamples = (int)kTestPatterns[i].size();
GrAlwaysAssert(numSamples > 1 && SkIsPow2(numSamples));
bottomUps[i].reset(create_render_target(ctx, kBottomLeft_GrSurfaceOrigin,
rand.nextRangeU(1 + numSamples / 2, numSamples)));
topDowns[i].reset(create_render_target(ctx, kTopLeft_GrSurfaceOrigin,
rand.nextRangeU(1 + numSamples / 2, numSamples)));
}
// Ensure all sample locations get queried and/or cached properly.
GrStencilSettings dummyStencil;
for (int repeat = 0; repeat < 2; ++repeat) {
for (int i = 0; i < numTestPatterns; ++i) {
testInterface->overrideSamplePattern(kTestPatterns[i]);
assert_equal(reporter, kTestPatterns[i],
topDowns[i]->renderTargetPriv().getMultisampleSpecs(dummyStencil), false);
assert_equal(reporter, kTestPatterns[i],
bottomUps[i]->renderTargetPriv().getMultisampleSpecs(dummyStencil), true);
}
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////
class GLTestSampleLocationsInterface : public TestSampleLocationsInterface, public GrGLInterface {
public:
GLTestSampleLocationsInterface() : fTestContext(sk_gpu_test::CreateDebugGLTestContext()) {
fStandard = fTestContext->gl()->fStandard;
fExtensions = fTestContext->gl()->fExtensions;
fFunctions = fTestContext->gl()->fFunctions;
fFunctions.fGetIntegerv = [&](GrGLenum pname, GrGLint* params) {
GrAlwaysAssert(GR_GL_EFFECTIVE_RASTER_SAMPLES != pname);
if (GR_GL_SAMPLES == pname) {
GrAlwaysAssert(!fSamplePattern.empty());
*params = (int)fSamplePattern.size();
} else {
fTestContext->gl()->fFunctions.fGetIntegerv(pname, params);
}
};
fFunctions.fGetMultisamplefv = [&](GrGLenum pname, GrGLuint index, GrGLfloat* val) {
GrAlwaysAssert(GR_GL_SAMPLE_POSITION == pname);
val[0] = fSamplePattern[index].fX;
val[1] = fSamplePattern[index].fY;
};
}
operator GrBackendContext() {
return reinterpret_cast<GrBackendContext>(static_cast<GrGLInterface*>(this));
}
void overrideSamplePattern(const SamplePattern& newPattern) override {
fSamplePattern = newPattern;
}
private:
SkAutoTDelete<sk_gpu_test::GLTestContext> fTestContext;
SamplePattern fSamplePattern;
};
DEF_GPUTEST(GLSampleLocations, reporter, /*factory*/) {
GLTestSampleLocationsInterface testInterface;
SkAutoTUnref<GrContext> ctx(GrContext::Create(kOpenGL_GrBackend, testInterface));
test_sampleLocations(reporter, &testInterface, ctx);
}
#endif