/*
 * Copyright 2016 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 "tests/Test.h"

#include "include/gpu/GrBackendSurface.h"
#include "src/gpu/GrContextPriv.h"
#include "src/gpu/GrGpu.h"
#include "src/gpu/GrProxyProvider.h"
#include "src/gpu/GrRenderTarget.h"
#include "src/gpu/GrRenderTargetProxy.h"
#include "src/gpu/GrSurfaceProxy.h"
#include "src/gpu/GrTexture.h"
#include "src/gpu/GrTextureProxy.h"

static sk_sp<GrSurfaceProxy> make_wrapped_rt(GrProxyProvider* provider,
                                             GrGpu* gpu,
                                             skiatest::Reporter* reporter,
                                             const SkISize& size,
                                             GrColorType colorType) {
    auto backendRT =
            gpu->createTestingOnlyBackendRenderTarget(size.width(), size.height(), colorType);
    return provider->wrapBackendRenderTarget(backendRT, colorType, nullptr, nullptr);
}

void clean_up_wrapped_rt(GrGpu* gpu, sk_sp<GrSurfaceProxy> proxy) {
    SkASSERT(proxy->unique());
    SkASSERT(proxy->peekRenderTarget());
    GrBackendRenderTarget rt = proxy->peekRenderTarget()->getBackendRenderTarget();
    proxy.reset();
    gpu->deleteTestingOnlyBackendRenderTarget(rt);
}

static sk_sp<GrSurfaceProxy> make_offscreen_rt(GrProxyProvider* provider,
                                               SkISize dimensions,
                                               GrColorType colorType) {
    return provider->testingOnly_createInstantiatedProxy(dimensions, colorType, GrRenderable::kYes,
                                                         1, SkBackingFit::kExact, SkBudgeted::kYes,
                                                         GrProtected::kNo);
}

static sk_sp<GrSurfaceProxy> make_texture(GrProxyProvider* provider,
                                          SkISize dimensions,
                                          GrColorType colorType,
                                          GrRenderable renderable) {
    return provider->testingOnly_createInstantiatedProxy(dimensions, colorType, renderable, 1,
                                                         SkBackingFit::kExact, SkBudgeted::kYes,
                                                         GrProtected::kNo);
}

// Test converting between RenderTargetProxies and TextureProxies for preinstantiated Proxies
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(PreinstantiatedProxyConversionTest, reporter, ctxInfo) {
    GrProxyProvider* proxyProvider = ctxInfo.grContext()->priv().proxyProvider();
    GrGpu* gpu = ctxInfo.grContext()->priv().getGpu();

    static constexpr auto kSize = SkISize::Make(64, 64);
    static constexpr auto kColorType = GrColorType::kRGBA_8888;

    {
        // External on-screen render target.
        sk_sp<GrSurfaceProxy> sProxy(
                make_wrapped_rt(proxyProvider, gpu, reporter, kSize, kColorType));
        if (sProxy) {
            // RenderTarget-only
            GrRenderTargetProxy* rtProxy = sProxy->asRenderTargetProxy();
            REPORTER_ASSERT(reporter, rtProxy);
            REPORTER_ASSERT(reporter, !rtProxy->asTextureProxy());
            REPORTER_ASSERT(reporter, rtProxy->asRenderTargetProxy() == rtProxy);
            clean_up_wrapped_rt(gpu, std::move(sProxy));
        }
    }

    {
        // Internal offscreen render target.
        sk_sp<GrSurfaceProxy> sProxy(make_offscreen_rt(proxyProvider, kSize, kColorType));
        if (sProxy) {
            // Both RenderTarget and Texture
            GrRenderTargetProxy* rtProxy = sProxy->asRenderTargetProxy();
            REPORTER_ASSERT(reporter, rtProxy);
            GrTextureProxy* tProxy = rtProxy->asTextureProxy();
            REPORTER_ASSERT(reporter, tProxy);
            REPORTER_ASSERT(reporter, tProxy->asRenderTargetProxy() == rtProxy);
            REPORTER_ASSERT(reporter, rtProxy->asRenderTargetProxy() == rtProxy);
        }
    }

    {
        // Internal offscreen render target - but through GrTextureProxy
        sk_sp<GrSurfaceProxy> sProxy(
                make_texture(proxyProvider, kSize, kColorType, GrRenderable::kYes));
        if (sProxy) {
            // Both RenderTarget and Texture
            GrTextureProxy* tProxy = sProxy->asTextureProxy();
            REPORTER_ASSERT(reporter, tProxy);
            GrRenderTargetProxy* rtProxy = tProxy->asRenderTargetProxy();
            REPORTER_ASSERT(reporter, rtProxy);
            REPORTER_ASSERT(reporter, rtProxy->asTextureProxy() == tProxy);
            REPORTER_ASSERT(reporter, tProxy->asTextureProxy() == tProxy);
        }
    }

    {
        // force no-RT
        sk_sp<GrSurfaceProxy> sProxy(
                make_texture(proxyProvider, kSize, kColorType, GrRenderable::kNo));
        if (sProxy) {
            // Texture-only
            GrTextureProxy* tProxy = sProxy->asTextureProxy();
            REPORTER_ASSERT(reporter, tProxy);
            REPORTER_ASSERT(reporter, tProxy->asTextureProxy() == tProxy);
            REPORTER_ASSERT(reporter, !tProxy->asRenderTargetProxy());
        }
    }
}

// Test converting between RenderTargetProxies and TextureProxies for deferred
// Proxies
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(DefferredProxyConversionTest, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    GrProxyProvider* proxyProvider = context->priv().proxyProvider();
    const GrCaps* caps = context->priv().caps();

    static constexpr SkISize kDims = {64, 64};

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

    {
        sk_sp<GrTextureProxy> proxy = proxyProvider->createProxy(
                format, kDims, swizzle, GrRenderable::kYes, 1, GrMipMapped::kNo,
                SkBackingFit::kApprox, SkBudgeted::kYes, GrProtected::kNo);

        // Both RenderTarget and Texture
        GrRenderTargetProxy* rtProxy = proxy->asRenderTargetProxy();
        REPORTER_ASSERT(reporter, rtProxy);
        GrTextureProxy* tProxy = rtProxy->asTextureProxy();
        REPORTER_ASSERT(reporter, tProxy);
        REPORTER_ASSERT(reporter, tProxy->asRenderTargetProxy() == rtProxy);
        REPORTER_ASSERT(reporter, rtProxy->asRenderTargetProxy() == rtProxy);
    }

    {
        sk_sp<GrTextureProxy> proxy = proxyProvider->createProxy(
                format, kDims, swizzle, GrRenderable::kYes, 1, GrMipMapped::kNo,
                SkBackingFit::kApprox, SkBudgeted::kYes, GrProtected::kNo);

        // Both RenderTarget and Texture - but via GrTextureProxy
        GrTextureProxy* tProxy = proxy->asTextureProxy();
        REPORTER_ASSERT(reporter, tProxy);
        GrRenderTargetProxy* rtProxy = tProxy->asRenderTargetProxy();
        REPORTER_ASSERT(reporter, rtProxy);
        REPORTER_ASSERT(reporter, rtProxy->asTextureProxy() == tProxy);
        REPORTER_ASSERT(reporter, tProxy->asTextureProxy() == tProxy);
    }

    {
        sk_sp<GrTextureProxy> proxy = proxyProvider->createProxy(
                format, kDims, swizzle, GrRenderable::kNo, 1, GrMipMapped::kNo,
                SkBackingFit::kApprox, SkBudgeted::kYes, GrProtected::kNo);
        // Texture-only
        GrTextureProxy* tProxy = proxy->asTextureProxy();
        REPORTER_ASSERT(reporter, tProxy);
        REPORTER_ASSERT(reporter, tProxy->asTextureProxy() == tProxy);
        REPORTER_ASSERT(reporter, !tProxy->asRenderTargetProxy());
    }
}