/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

// This is a GPU-backend specific test.

#include "include/core/SkAlphaType.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkColorSpace.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurfaceProps.h"
#include "include/core/SkTypes.h"
#include "include/gpu/GpuTypes.h"
#include "include/gpu/GrBackendSurface.h"
#include "include/gpu/GrContextOptions.h"
#include "include/gpu/GrDirectContext.h"
#include "include/gpu/GrTypes.h"
#include "include/gpu/gl/GrGLTypes.h"
#include "include/private/gpu/ganesh/GrTypesPriv.h"
#include "include/utils/SkRandom.h"
#include "src/gpu/KeyBuilder.h"
#include "src/gpu/SkBackingFit.h"
#include "src/gpu/Swizzle.h"
#include "src/gpu/ganesh/GrAutoLocaleSetter.h"
#include "src/gpu/ganesh/GrCaps.h"
#include "src/gpu/ganesh/GrDirectContextPriv.h"
#include "src/gpu/ganesh/GrDrawOpTest.h"
#include "src/gpu/ganesh/GrDrawingManager.h"
#include "src/gpu/ganesh/GrFragmentProcessor.h"
#include "src/gpu/ganesh/GrPaint.h"
#include "src/gpu/ganesh/GrProcessorUnitTest.h"
#include "src/gpu/ganesh/GrProxyProvider.h"
#include "src/gpu/ganesh/GrSurfaceProxy.h"
#include "src/gpu/ganesh/SurfaceDrawContext.h"
#include "src/gpu/ganesh/effects/GrBlendFragmentProcessor.h"
#include "src/gpu/ganesh/effects/GrPorterDuffXferProcessor.h"
#include "src/gpu/ganesh/glsl/GrGLSLFragmentShaderBuilder.h"
#include "tests/CtsEnforcement.h"
#include "tests/Test.h"

#include <algorithm>
#include <array>
#include <cstdint>
#include <memory>
#include <tuple>
#include <utility>

class GrRecordingContext;
struct GrShaderCaps;

#ifdef SK_GL
#include "src/gpu/ganesh/gl/GrGLGpu.h"
#endif

/*
 * A simple processor which just tries to insert a massive key and verify that it can retrieve the
 * whole thing correctly
 */
static const uint32_t kMaxKeySize = 1024;

namespace {
class BigKeyProcessor : public GrFragmentProcessor {
public:
    static std::unique_ptr<GrFragmentProcessor> Make() {
        return std::unique_ptr<GrFragmentProcessor>(new BigKeyProcessor);
    }

    const char* name() const override { return "Big_Ole_Key"; }

    std::unique_ptr<ProgramImpl> onMakeProgramImpl() const override {
        class Impl : public ProgramImpl {
        public:
            void emitCode(EmitArgs& args) override {
                args.fFragBuilder->codeAppendf("return half4(1);\n");
            }
        };

        return std::make_unique<Impl>();
    }

    std::unique_ptr<GrFragmentProcessor> clone() const override { return Make(); }

private:
    BigKeyProcessor() : INHERITED(kBigKeyProcessor_ClassID, kNone_OptimizationFlags) {}
    void onAddToKey(const GrShaderCaps& caps, skgpu::KeyBuilder* b) const override {
        for (uint32_t i = 0; i < kMaxKeySize; i++) {
            b->add32(i);
        }
    }
    bool onIsEqual(const GrFragmentProcessor&) const override { return true; }

    GR_DECLARE_FRAGMENT_PROCESSOR_TEST

    using INHERITED = GrFragmentProcessor;
};
}  // anonymous namespace

GR_DEFINE_FRAGMENT_PROCESSOR_TEST(BigKeyProcessor)

#if GR_TEST_UTILS
std::unique_ptr<GrFragmentProcessor> BigKeyProcessor::TestCreate(GrProcessorTestData*) {
    return BigKeyProcessor::Make();
}
#endif

//////////////////////////////////////////////////////////////////////////////

class BlockInputFragmentProcessor : public GrFragmentProcessor {
public:
    static std::unique_ptr<GrFragmentProcessor> Make(std::unique_ptr<GrFragmentProcessor> fp) {
        return std::unique_ptr<GrFragmentProcessor>(new BlockInputFragmentProcessor(std::move(fp)));
    }

    const char* name() const override { return "Block_Input"; }

    std::unique_ptr<ProgramImpl> onMakeProgramImpl() const override {
        return std::make_unique<GLFP>();
    }

    std::unique_ptr<GrFragmentProcessor> clone() const override {
        return Make(this->childProcessor(0)->clone());
    }

private:
    class GLFP : public ProgramImpl {
    public:
        void emitCode(EmitArgs& args) override {
            SkString temp = this->invokeChild(0, args);
            args.fFragBuilder->codeAppendf("return %s;", temp.c_str());
        }

    private:
        using INHERITED = ProgramImpl;
    };

    BlockInputFragmentProcessor(std::unique_ptr<GrFragmentProcessor> child)
            : INHERITED(kBlockInputFragmentProcessor_ClassID, kNone_OptimizationFlags) {
        this->registerChild(std::move(child));
    }

    void onAddToKey(const GrShaderCaps&, skgpu::KeyBuilder*) const override {}

    bool onIsEqual(const GrFragmentProcessor&) const override { return true; }

    using INHERITED = GrFragmentProcessor;
};

//////////////////////////////////////////////////////////////////////////////

/*
 * Begin test code
 */
static const int kRenderTargetHeight = 1;
static const int kRenderTargetWidth = 1;

static std::unique_ptr<skgpu::v1::SurfaceDrawContext> random_surface_draw_context(
        GrRecordingContext* rContext,
        SkRandom* random,
        const GrCaps* caps) {
    GrSurfaceOrigin origin = random->nextBool() ? kTopLeft_GrSurfaceOrigin
                                                : kBottomLeft_GrSurfaceOrigin;

    GrColorType ct = GrColorType::kRGBA_8888;
    const GrBackendFormat format = caps->getDefaultBackendFormat(ct, GrRenderable::kYes);

    int sampleCnt = random->nextBool() ? caps->getRenderTargetSampleCount(2, format) : 1;
    // Above could be 0 if msaa isn't supported.
    sampleCnt = std::max(1, sampleCnt);

    return skgpu::v1::SurfaceDrawContext::Make(
            rContext, GrColorType::kRGBA_8888, nullptr, SkBackingFit::kExact,
            {kRenderTargetWidth, kRenderTargetHeight}, SkSurfaceProps(), /*label=*/{},
            sampleCnt, GrMipmapped::kNo, GrProtected::kNo, origin);
}

#if GR_TEST_UTILS
static void set_random_xpf(GrPaint* paint, GrProcessorTestData* d) {
    paint->setXPFactory(GrXPFactoryTestFactory::Get(d));
}

static std::unique_ptr<GrFragmentProcessor> create_random_proc_tree(GrProcessorTestData* d,
                                                                    int minLevels, int maxLevels) {
    SkASSERT(1 <= minLevels);
    SkASSERT(minLevels <= maxLevels);

    // Return a leaf node if maxLevels is 1 or if we randomly chose to terminate.
    // If returning a leaf node, make sure that it doesn't have children (e.g. another
    // GrComposeEffect)
    const float terminateProbability = 0.3f;
    if (1 == minLevels) {
        bool terminate = (1 == maxLevels) || (d->fRandom->nextF() < terminateProbability);
        if (terminate) {
            std::unique_ptr<GrFragmentProcessor> fp;
            while (true) {
                fp = GrFragmentProcessorTestFactory::Make(d);
                if (!fp) {
                    return nullptr;
                }
                if (0 == fp->numNonNullChildProcessors()) {
                    break;
                }
            }
            return fp;
        }
    }
    // If we didn't terminate, choose either the left or right subtree to fulfill
    // the minLevels requirement of this tree; the other child can have as few levels as it wants.
    // Also choose a random xfer mode.
    if (minLevels > 1) {
        --minLevels;
    }
    auto minLevelsChild = create_random_proc_tree(d, minLevels, maxLevels - 1);
    std::unique_ptr<GrFragmentProcessor> otherChild(create_random_proc_tree(d, 1, maxLevels - 1));
    if (!minLevelsChild || !otherChild) {
        return nullptr;
    }
    SkBlendMode mode = static_cast<SkBlendMode>(d->fRandom->nextRangeU(0,
                                                               (int)SkBlendMode::kLastMode));
    std::unique_ptr<GrFragmentProcessor> fp;
    if (d->fRandom->nextF() < 0.5f) {
        fp = GrBlendFragmentProcessor::Make(std::move(minLevelsChild), std::move(otherChild), mode);
        SkASSERT(fp);
    } else {
        fp = GrBlendFragmentProcessor::Make(std::move(otherChild), std::move(minLevelsChild), mode);
        SkASSERT(fp);
    }
    return fp;
}

static void set_random_color_coverage_stages(GrPaint* paint,
                                             GrProcessorTestData* d,
                                             int maxStages,
                                             int maxTreeLevels) {
    // Randomly choose to either create a linear pipeline of procs or create one proc tree
    const float procTreeProbability = 0.5f;
    if (d->fRandom->nextF() < procTreeProbability) {
        std::unique_ptr<GrFragmentProcessor> fp(create_random_proc_tree(d, 2, maxTreeLevels));
        if (fp) {
            paint->setColorFragmentProcessor(std::move(fp));
        }
    } else {
        if (maxStages >= 1) {
            if (std::unique_ptr<GrFragmentProcessor> fp = GrFragmentProcessorTestFactory::Make(d)) {
                paint->setColorFragmentProcessor(std::move(fp));
            }
        }
        if (maxStages >= 2) {
            if (std::unique_ptr<GrFragmentProcessor> fp = GrFragmentProcessorTestFactory::Make(d)) {
                paint->setCoverageFragmentProcessor(std::move(fp));
            }
        }
    }
}

#endif

#if !GR_TEST_UTILS
bool GrDrawingManager::ProgramUnitTest(GrDirectContext*, int) { return true; }
#else
bool GrDrawingManager::ProgramUnitTest(GrDirectContext* direct, int maxStages, int maxLevels) {
    GrProxyProvider* proxyProvider = direct->priv().proxyProvider();
    const GrCaps* caps = direct->priv().caps();

    GrProcessorTestData::ViewInfo views[2];

    // setup arbitrary textures
    GrMipmapped mipmapped = GrMipmapped(caps->mipmapSupport());
    {
        static constexpr SkISize kDims = {34, 18};
        const GrBackendFormat format = caps->getDefaultBackendFormat(GrColorType::kRGBA_8888,
                                                                     GrRenderable::kYes);
        auto proxy = proxyProvider->createProxy(format,
                                                kDims,
                                                GrRenderable::kYes,
                                                1,
                                                mipmapped,
                                                SkBackingFit::kExact,
                                                skgpu::Budgeted::kNo,
                                                GrProtected::kNo,
                                                /*label=*/{},
                                                GrInternalSurfaceFlags::kNone);
        skgpu::Swizzle swizzle = caps->getReadSwizzle(format, GrColorType::kRGBA_8888);
        views[0] = {{std::move(proxy), kBottomLeft_GrSurfaceOrigin, swizzle},
                    GrColorType::kRGBA_8888, kPremul_SkAlphaType};
    }
    {
        static constexpr SkISize kDims = {16, 22};
        const GrBackendFormat format = caps->getDefaultBackendFormat(GrColorType::kAlpha_8,
                                                                     GrRenderable::kNo);
        auto proxy = proxyProvider->createProxy(format,
                                                kDims,
                                                GrRenderable::kNo,
                                                1,
                                                mipmapped,
                                                SkBackingFit::kExact,
                                                skgpu::Budgeted::kNo,
                                                GrProtected::kNo,
                                                /*label=*/{},
                                                GrInternalSurfaceFlags::kNone);
        skgpu::Swizzle swizzle = caps->getReadSwizzle(format, GrColorType::kAlpha_8);
        views[1] = {{std::move(proxy), kTopLeft_GrSurfaceOrigin, swizzle},
                      GrColorType::kAlpha_8, kPremul_SkAlphaType};
    }

    if (!std::get<0>(views[0]) || !std::get<0>(views[1])) {
        SkDebugf("Could not allocate textures for test");
        return false;
    }

    SkRandom random;
    static const int NUM_TESTS = 1024;
    for (int t = 0; t < NUM_TESTS; t++) {
        // setup random render target(can fail)
        auto surfaceDrawContext = random_surface_draw_context(direct, &random, caps);
        if (!surfaceDrawContext) {
            SkDebugf("Could not allocate surfaceDrawContext");
            return false;
        }

        GrPaint paint;
        GrProcessorTestData ptd(&random, direct, /*maxTreeDepth=*/1, std::size(views), views);
        set_random_color_coverage_stages(&paint, &ptd, maxStages, maxLevels);
        set_random_xpf(&paint, &ptd);
        GrDrawRandomOp(&random, surfaceDrawContext.get(), std::move(paint));
    }
    // Flush everything, test passes if flush is successful(ie, no asserts are hit, no crashes)
    direct->flush(GrFlushInfo());
    direct->submit(false);

    // Validate that GrFPs work correctly without an input.
    auto sdc = skgpu::v1::SurfaceDrawContext::Make(
            direct, GrColorType::kRGBA_8888, nullptr, SkBackingFit::kExact,
            {kRenderTargetWidth, kRenderTargetHeight}, SkSurfaceProps(),
            /*label=*/{});
    if (!sdc) {
        SkDebugf("Could not allocate a surfaceDrawContext");
        return false;
    }

    int fpFactoryCnt = GrFragmentProcessorTestFactory::Count();
    for (int i = 0; i < fpFactoryCnt; ++i) {
        // Since FP factories internally randomize, call each 10 times.
        for (int j = 0; j < 10; ++j) {
            GrProcessorTestData ptd(&random, direct, /*maxTreeDepth=*/1, std::size(views),
                                    views);

            GrPaint paint;
            paint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
            auto fp = GrFragmentProcessorTestFactory::MakeIdx(i, &ptd);
            auto blockFP = BlockInputFragmentProcessor::Make(std::move(fp));
            paint.setColorFragmentProcessor(std::move(blockFP));
            GrDrawRandomOp(&random, sdc.get(), std::move(paint));

            direct->flush(GrFlushInfo());
            direct->submit(false);
        }
    }

    return true;
}
#endif

static int get_programs_max_stages(const sk_gpu_test::ContextInfo& ctxInfo) {
    int maxStages = 6;
#ifdef SK_GL
    auto context = ctxInfo.directContext();
    if (skiatest::IsGLContextType(ctxInfo.type())) {
        GrGLGpu* gpu = static_cast<GrGLGpu*>(context->priv().getGpu());
        if (kGLES_GrGLStandard == gpu->glStandard()) {
        // We've had issues with driver crashes and HW limits being exceeded with many effects on
        // Android devices. We have passes on ARM devices with the default number of stages.
        // TODO When we run ES 3.00 GLSL in more places, test again
#ifdef SK_BUILD_FOR_ANDROID
        if (gpu->ctxInfo().vendor() != GrGLVendor::kARM) {
            maxStages = 1;
        }
#endif
        // On iOS we can exceed the maximum number of varyings. http://skbug.com/6627.
#ifdef SK_BUILD_FOR_IOS
            maxStages = 3;
#endif
        }
        // On Angle D3D we will hit a limit of out variables if we use too many stages. This is
        // particularly true on D3D9 with a low limit on varyings and the fact that every varying is
        // packed as though it has 4 components.
        if (ctxInfo.type() == sk_gpu_test::GrContextFactory::kANGLE_D3D9_ES2_ContextType) {
            maxStages = 2;
        } else if (ctxInfo.type() == sk_gpu_test::GrContextFactory::kANGLE_D3D11_ES2_ContextType) {
            maxStages = 3;
        }
    }
#endif
    return maxStages;
}

static int get_programs_max_levels(const sk_gpu_test::ContextInfo& ctxInfo) {
    // A full tree with 5 levels (31 nodes) may cause a program that exceeds shader limits
    // (e.g. uniform or varying limits); maxTreeLevels should be a number from 1 to 4 inclusive.
    int maxTreeLevels = 4;
    if (skiatest::IsGLContextType(ctxInfo.type())) {
        // On iOS we can exceed the maximum number of varyings. http://skbug.com/6627.
#ifdef SK_BUILD_FOR_IOS
        maxTreeLevels = 2;
#endif
#if defined(SK_BUILD_FOR_ANDROID) && defined(SK_GL)
        GrGLGpu* gpu = static_cast<GrGLGpu*>(ctxInfo.directContext()->priv().getGpu());
        // Tecno Spark 3 Pro with Power VR Rogue GE8300 will fail shader compiles with
        // no message if the shader is particularly long.
        if (gpu->ctxInfo().vendor() == GrGLVendor::kImagination) {
            maxTreeLevels = 3;
        }
#endif
        if (ctxInfo.type() == sk_gpu_test::GrContextFactory::kANGLE_D3D9_ES2_ContextType ||
            ctxInfo.type() == sk_gpu_test::GrContextFactory::kANGLE_D3D11_ES2_ContextType) {
            // On Angle D3D we will hit a limit of out variables if we use too many stages.
            maxTreeLevels = 2;
        }
    }
    return maxTreeLevels;
}

static void test_programs(skiatest::Reporter* reporter, const sk_gpu_test::ContextInfo& ctxInfo) {
    int maxStages = get_programs_max_stages(ctxInfo);
    if (maxStages == 0) {
        return;
    }
    int maxLevels = get_programs_max_levels(ctxInfo);
    if (maxLevels == 0) {
        return;
    }

    REPORTER_ASSERT(reporter, GrDrawingManager::ProgramUnitTest(ctxInfo.directContext(), maxStages,
                                                                maxLevels));
}

DEF_GANESH_TEST(Programs, reporter, options, CtsEnforcement::kNever) {
    // Set a locale that would cause shader compilation to fail because of , as decimal separator.
    // skbug 3330
#ifdef SK_BUILD_FOR_WIN
    GrAutoLocaleSetter als("sv-SE");
#else
    GrAutoLocaleSetter als("sv_SE.UTF-8");
#endif

    // We suppress prints to avoid spew
    GrContextOptions opts = options;
    opts.fSuppressPrints = true;
    sk_gpu_test::GrContextFactory debugFactory(opts);
    skiatest::RunWithGaneshTestContexts(
            test_programs, &sk_gpu_test::GrContextFactory::IsRenderingContext, reporter, opts);
}