/*
 * Copyright 2017 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 "Test.h"

#if SK_SUPPORT_GPU

#include "GrBackendSurface.h"
#include "GrContextPriv.h"
#include "GrResourceCache.h"
#include "GrResourceProvider.h"
#include "GrTest.h"
#include "GrTexture.h"
#include "GrTextureProxy.h"

#include "SkGr.h"
#include "SkImage.h"

int GrResourceCache::numUniqueKeyProxies_TestOnly() const {
    return fUniquelyKeyedProxies.count();
}

static GrSurfaceDesc make_desc(GrSurfaceFlags flags) {
    GrSurfaceDesc desc;
    desc.fFlags = flags;
    desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
    desc.fWidth = 64;
    desc.fHeight = 64;
    desc.fConfig = kRGBA_8888_GrPixelConfig;
    desc.fSampleCnt = 0;

    return desc;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
// Basic test

static sk_sp<GrTextureProxy> deferred_tex(GrResourceProvider* provider, SkBackingFit fit) {
    GrSurfaceDesc desc = make_desc(kNone_GrSurfaceFlags);

    // Only budgeted & wrapped external proxies get to carry uniqueKeys
    return GrSurfaceProxy::MakeDeferred(provider, desc, fit, SkBudgeted::kYes);
}

static sk_sp<GrTextureProxy> deferred_texRT(GrResourceProvider* provider, SkBackingFit fit) {
    GrSurfaceDesc desc = make_desc(kRenderTarget_GrSurfaceFlag);

    // Only budgeted & wrapped external proxies get to carry uniqueKeys
    return GrSurfaceProxy::MakeDeferred(provider, desc, fit, SkBudgeted::kYes);
}

static sk_sp<GrTextureProxy> wrapped(GrResourceProvider* provider, SkBackingFit fit) {
    GrSurfaceDesc desc = make_desc(kNone_GrSurfaceFlags);

    sk_sp<GrTexture> tex;
    if (SkBackingFit::kApprox == fit) {
        tex = sk_sp<GrTexture>(provider->createApproxTexture(desc, 0));
    } else {
        // Only budgeted & wrapped external proxies get to carry uniqueKeys
        tex = provider->createTexture(desc, SkBudgeted::kYes);
    }

    return GrSurfaceProxy::MakeWrapped(std::move(tex), kBottomLeft_GrSurfaceOrigin);
}

static sk_sp<GrTextureProxy> create_wrapped_backend(GrContext* context, SkBackingFit fit,
                                                    sk_sp<GrTexture>* backingSurface) {
    GrResourceProvider* provider = context->resourceProvider();

    GrSurfaceDesc desc = make_desc(kNone_GrSurfaceFlags);

    *backingSurface = provider->createTexture(desc, SkBudgeted::kNo);
    if (!(*backingSurface)) {
        return nullptr;
    }

    GrBackendTexture backendTex =
            GrTest::CreateBackendTexture(context->contextPriv().getBackend(),
                                         64, 64,
                                         kRGBA_8888_GrPixelConfig,
                                         (*backingSurface)->getTextureHandle());

    return GrSurfaceProxy::MakeWrappedBackend(context, backendTex, kBottomLeft_GrSurfaceOrigin);
}


// This tests the basic capabilities of the uniquely keyed texture proxies. Does assigning
// and looking them up work, etc.
static void basic_test(GrContext* context,
                       skiatest::Reporter* reporter,
                       sk_sp<GrTextureProxy> proxy, bool proxyIsCached) {
    static int id = 1;

    GrResourceProvider* provider = context->resourceProvider();
    GrResourceCache* cache = context->getResourceCache();

    int startCacheCount = cache->getResourceCount();

    REPORTER_ASSERT(reporter, !proxy->getUniqueKey().isValid());

    GrUniqueKey key;
    GrMakeKeyFromImageID(&key, id, SkIRect::MakeWH(64, 64));
    ++id;

    // Assigning the uniqueKey adds the proxy to the hash but doesn't force instantiation
    REPORTER_ASSERT(reporter, !cache->numUniqueKeyProxies_TestOnly());
    provider->assignUniqueKeyToProxy(key, proxy.get());
    REPORTER_ASSERT(reporter, 1 == cache->numUniqueKeyProxies_TestOnly());
    REPORTER_ASSERT(reporter, startCacheCount == cache->getResourceCount());

    // setUniqueKey had better stick
    REPORTER_ASSERT(reporter, key == proxy->getUniqueKey());

    // We just added it, surely we can find it
    REPORTER_ASSERT(reporter, provider->findProxyByUniqueKey(key, kBottomLeft_GrSurfaceOrigin));
    REPORTER_ASSERT(reporter, 1 == cache->numUniqueKeyProxies_TestOnly());

    // Once instantiated, the backing resource should have the same key
    SkAssertResult(proxy->instantiate(provider));
    const GrUniqueKey& texKey = proxy->priv().peekSurface()->getUniqueKey();
    REPORTER_ASSERT(reporter, texKey.isValid());
    REPORTER_ASSERT(reporter, key == texKey);
    if (proxyIsCached) {
        REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    }

    // deleting the proxy should delete it from the hash but not the cache
    proxy = nullptr;
    REPORTER_ASSERT(reporter, 0 == cache->numUniqueKeyProxies_TestOnly());
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());

    // If the proxy was cached refinding it should bring it back to life
    proxy = provider->findProxyByUniqueKey(key, kBottomLeft_GrSurfaceOrigin);
    if (proxyIsCached) {
        REPORTER_ASSERT(reporter, proxy);
        REPORTER_ASSERT(reporter, 1 == cache->numUniqueKeyProxies_TestOnly());
    } else {
        REPORTER_ASSERT(reporter, !proxy);
        REPORTER_ASSERT(reporter, 0 == cache->numUniqueKeyProxies_TestOnly());
    }
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());

    // Mega-purging it should remove it from both the hash and the cache
    proxy = nullptr;
    cache->purgeAllUnlocked();
    if (proxyIsCached) {
        REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
    } else {
        REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    }

    // We can bring neither the texture nor proxy back from perma-death
    proxy = provider->findProxyByUniqueKey(key, kBottomLeft_GrSurfaceOrigin);
    REPORTER_ASSERT(reporter, !proxy);
    if (proxyIsCached) {
        REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
    } else {
        REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());
    }
}

///////////////////////////////////////////////////////////////////////////////////////////////////
// Invalidation test

// Test if invalidating unique ids operates as expected for texture proxies.
static void invalidation_test(GrContext* context, skiatest::Reporter* reporter) {

    GrResourceCache* cache = context->getResourceCache();
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());

    sk_sp<SkImage> rasterImg;

    {
        SkImageInfo ii = SkImageInfo::Make(64, 64, kRGBA_8888_SkColorType, kOpaque_SkAlphaType);

        SkBitmap bm;
        bm.allocPixels(ii);

        rasterImg = SkImage::MakeFromBitmap(bm);
        REPORTER_ASSERT(reporter, 0 == cache->numUniqueKeyProxies_TestOnly());
        REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
    }

    sk_sp<SkImage> textureImg = rasterImg->makeTextureImage(context, nullptr);
    REPORTER_ASSERT(reporter, 1 == cache->numUniqueKeyProxies_TestOnly());
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());

    rasterImg = nullptr;        // this invalidates the uniqueKey

    // this forces the cache to respond to the inval msg
    int maxNum;
    size_t maxBytes;
    context->getResourceCacheLimits(&maxNum, &maxBytes);
    context->setResourceCacheLimits(maxNum-1, maxBytes);

    REPORTER_ASSERT(reporter, 0 == cache->numUniqueKeyProxies_TestOnly());
    REPORTER_ASSERT(reporter, 1 == cache->getResourceCount());

    textureImg = nullptr;
    context->purgeAllUnlockedResources();

    REPORTER_ASSERT(reporter, 0 == cache->numUniqueKeyProxies_TestOnly());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
}

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(TextureProxyTest, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    GrResourceProvider* provider = context->resourceProvider();
    GrResourceCache* cache = context->getResourceCache();

    REPORTER_ASSERT(reporter, !cache->numUniqueKeyProxies_TestOnly());
    REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());

    for (auto fit : { SkBackingFit::kExact, SkBackingFit::kApprox }) {
        for (auto create : { deferred_tex, deferred_texRT, wrapped }) {
            REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
            basic_test(context, reporter, create(provider, fit), true);
        }

        REPORTER_ASSERT(reporter, 0 == cache->getResourceCount());
        sk_sp<GrTexture> backingTex;
        sk_sp<GrTextureProxy> proxy = create_wrapped_backend(context, fit, &backingTex);
        basic_test(context, reporter, std::move(proxy), false);

        backingTex = nullptr;
        cache->purgeAllUnlocked();
    }

    invalidation_test(context, reporter);
}

#endif