/*
 * Copyright 2018 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "Test.h"

#include "GrBackendSurface.h"
#include "GrContextPriv.h"
#include "GrGpu.h"
#include "SkImage_Gpu.h"

using namespace sk_gpu_test;

struct PromiseTextureChecker {
    explicit PromiseTextureChecker(const GrBackendTexture& tex)
            : fTexture(tex)
            , fFulfillCount(0)
            , fReleaseCount(0)
            , fDoneCount(0) {}
    GrBackendTexture fTexture;
    int fFulfillCount;
    int fReleaseCount;
    int fDoneCount;
    static void Fulfill(void* self, GrBackendTexture* outTexture) {
        static_cast<PromiseTextureChecker*>(self)->fFulfillCount++;
        *outTexture = static_cast<PromiseTextureChecker*>(self)->fTexture;
    }
    static void Release(void* self) {
        static_cast<PromiseTextureChecker*>(self)->fReleaseCount++;
    }
    static void Done(void* self) {
        static_cast<PromiseTextureChecker*>(self)->fDoneCount++;
    }
};

// Because Vulkan may delay when it actually calls the ReleaseProcs depending on when command
// buffers finish their work, we need some slight wiggle room in what values we expect for fulfill
// and release counts.
static bool check_fulfill_and_release_cnts(const PromiseTextureChecker& promiseChecker,
                                           bool countsMustBeEqual,
                                           int expectedFulfillCnt,
                                           int expectedReleaseCnt,
                                           bool expectedRequired,
                                           int expectedDoneCnt,
                                           skiatest::Reporter* reporter) {
    bool result = true;
    int countDiff = promiseChecker.fFulfillCount - promiseChecker.fReleaseCount;
    // FulfillCount should always equal ReleaseCount or be at most one higher
    if (countDiff != 0) {
        if (countsMustBeEqual) {
            result = false;
            REPORTER_ASSERT(reporter, 0 == countDiff);
        } else if (countDiff != 1) {
            result = false;
            REPORTER_ASSERT(reporter, 0 == countDiff || 1 == countDiff);
        }
    }

    int fulfillDiff = expectedFulfillCnt - promiseChecker.fFulfillCount;
    REPORTER_ASSERT(reporter, fulfillDiff >= 0);
    if (fulfillDiff != 0) {
        if (expectedRequired) {
            result = false;
            REPORTER_ASSERT(reporter, expectedFulfillCnt == promiseChecker.fFulfillCount);
        } else if (fulfillDiff > 1) {
            result = false;
            REPORTER_ASSERT(reporter, fulfillDiff <= 1);
        }
    }

    int releaseDiff = expectedReleaseCnt - promiseChecker.fReleaseCount;
    REPORTER_ASSERT(reporter, releaseDiff >= 0);
    if (releaseDiff != 0) {
        if (expectedRequired) {
            result = false;
            REPORTER_ASSERT(reporter, expectedReleaseCnt == promiseChecker.fReleaseCount);
        } else if (releaseDiff > 1) {
            result = false;
            REPORTER_ASSERT(reporter, releaseDiff <= 1);
        }
    }

    if (expectedDoneCnt != promiseChecker.fDoneCount) {
        result = false;
        REPORTER_ASSERT(reporter, expectedDoneCnt == promiseChecker.fDoneCount);
    }

    return result;
}

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(PromiseImageTest, reporter, ctxInfo) {
    const int kWidth = 10;
    const int kHeight = 10;

    GrContext* ctx = ctxInfo.grContext();
    GrGpu* gpu = ctx->contextPriv().getGpu();

    for (bool releaseImageEarly : {true, false}) {
        GrBackendTexture backendTex = gpu->createTestingOnlyBackendTexture(
                nullptr, kWidth, kHeight, GrColorType::kRGBA_8888, true, GrMipMapped::kNo);
        REPORTER_ASSERT(reporter, backendTex.isValid());

        GrBackendFormat backendFormat = backendTex.getBackendFormat();
        REPORTER_ASSERT(reporter, backendFormat.isValid());

        PromiseTextureChecker promiseChecker(backendTex);
        GrSurfaceOrigin texOrigin = kTopLeft_GrSurfaceOrigin;
        sk_sp<SkImage> refImg(
                SkImage_Gpu::MakePromiseTexture(ctx, backendFormat, kWidth, kHeight,
                                                GrMipMapped::kNo, texOrigin,
                                                kRGBA_8888_SkColorType, kPremul_SkAlphaType,
                                                nullptr,
                                                PromiseTextureChecker::Fulfill,
                                                PromiseTextureChecker::Release,
                                                PromiseTextureChecker::Done,
                                                &promiseChecker));

        SkImageInfo info = SkImageInfo::MakeN32Premul(kWidth, kHeight);
        sk_sp<SkSurface> surface = SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info);
        SkCanvas* canvas = surface->getCanvas();

        int expectedFulfillCnt = 0;
        int expectedReleaseCnt = 0;
        int expectedDoneCnt = 0;

        canvas->drawImage(refImg, 0, 0);
        REPORTER_ASSERT(reporter, check_fulfill_and_release_cnts(promiseChecker,
                                                                 true,
                                                                 expectedFulfillCnt,
                                                                 expectedReleaseCnt,
                                                                 true,
                                                                 expectedDoneCnt,
                                                                 reporter));

        bool isVulkan = GrBackendApi::kVulkan == ctx->contextPriv().getBackend();
        canvas->flush();
        expectedFulfillCnt++;
        expectedReleaseCnt++;
        REPORTER_ASSERT(reporter, check_fulfill_and_release_cnts(promiseChecker,
                                                                 !isVulkan,
                                                                 expectedFulfillCnt,
                                                                 expectedReleaseCnt,
                                                                 !isVulkan,
                                                                 expectedDoneCnt,
                                                                 reporter));

        gpu->testingOnly_flushGpuAndSync();
        REPORTER_ASSERT(reporter, check_fulfill_and_release_cnts(promiseChecker,
                                                                 true,
                                                                 expectedFulfillCnt,
                                                                 expectedReleaseCnt,
                                                                 true,
                                                                 expectedDoneCnt,
                                                                 reporter));

        canvas->drawImage(refImg, 0, 0);
        canvas->drawImage(refImg, 0, 0);

        canvas->flush();
        expectedFulfillCnt++;
        expectedReleaseCnt++;

        gpu->testingOnly_flushGpuAndSync();
        REPORTER_ASSERT(reporter, check_fulfill_and_release_cnts(promiseChecker,
                                                                 true,
                                                                 expectedFulfillCnt,
                                                                 expectedReleaseCnt,
                                                                 true,
                                                                 expectedDoneCnt,
                                                                 reporter));

        // Now test code path on Vulkan where we released the texture, but the GPU isn't done with
        // resource yet and we do another draw. We should only call fulfill on the first draw and
        // use the cached GrBackendTexture on the second. Release should only be called after the
        // second draw is finished.
        canvas->drawImage(refImg, 0, 0);
        canvas->flush();
        expectedFulfillCnt++;
        expectedReleaseCnt++;
        REPORTER_ASSERT(reporter, check_fulfill_and_release_cnts(promiseChecker,
                                                                 !isVulkan,
                                                                 expectedFulfillCnt,
                                                                 expectedReleaseCnt,
                                                                 !isVulkan,
                                                                 expectedDoneCnt,
                                                                 reporter));

        canvas->drawImage(refImg, 0, 0);

        if (releaseImageEarly) {
            refImg.reset();
        }

        REPORTER_ASSERT(reporter, check_fulfill_and_release_cnts(promiseChecker,
                                                                 !isVulkan,
                                                                 expectedFulfillCnt,
                                                                 expectedReleaseCnt,
                                                                 !isVulkan,
                                                                 expectedDoneCnt,
                                                                 reporter));

        canvas->flush();
        expectedFulfillCnt++;

        gpu->testingOnly_flushGpuAndSync();
        expectedReleaseCnt++;
        if (releaseImageEarly) {
            expectedDoneCnt++;
        }
        REPORTER_ASSERT(reporter, check_fulfill_and_release_cnts(promiseChecker,
                                                                 true,
                                                                 expectedFulfillCnt,
                                                                 expectedReleaseCnt,
                                                                 !isVulkan,
                                                                 expectedDoneCnt,
                                                                 reporter));
        expectedFulfillCnt = promiseChecker.fFulfillCount;
        expectedReleaseCnt = promiseChecker.fReleaseCount;

        if (!releaseImageEarly) {
            refImg.reset();
            expectedDoneCnt++;
        }

        REPORTER_ASSERT(reporter, check_fulfill_and_release_cnts(promiseChecker,
                                                                 true,
                                                                 expectedFulfillCnt,
                                                                 expectedReleaseCnt,
                                                                 true,
                                                                 expectedDoneCnt,
                                                                 reporter));

        gpu->deleteTestingOnlyBackendTexture(backendTex);
    }
}