// Copyright 2019 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "tests/DawnTest.h"

#include "utils/ComboRenderPipelineDescriptor.h"
#include "utils/DawnHelpers.h"

class TextureZeroInitTest : public DawnTest {
  protected:
    void SetUp() override {
        DawnTest::SetUp();
    }
    dawn::TextureDescriptor CreateTextureDescriptor(uint32_t mipLevelCount,
                                                    uint32_t arrayLayerCount,
                                                    dawn::TextureUsageBit usage,
                                                    dawn::TextureFormat format) {
        dawn::TextureDescriptor descriptor;
        descriptor.dimension = dawn::TextureDimension::e2D;
        descriptor.size.width = kSize;
        descriptor.size.height = kSize;
        descriptor.size.depth = 1;
        descriptor.arrayLayerCount = arrayLayerCount;
        descriptor.sampleCount = 1;
        descriptor.format = format;
        descriptor.mipLevelCount = mipLevelCount;
        descriptor.usage = usage;
        return descriptor;
    }
    dawn::TextureViewDescriptor CreateTextureViewDescriptor(uint32_t baseMipLevel,
                                                            uint32_t baseArrayLayer) {
        dawn::TextureViewDescriptor descriptor;
        descriptor.format = kColorFormat;
        descriptor.baseArrayLayer = baseArrayLayer;
        descriptor.arrayLayerCount = 1;
        descriptor.baseMipLevel = baseMipLevel;
        descriptor.mipLevelCount = 1;
        descriptor.dimension = dawn::TextureViewDimension::e2D;
        return descriptor;
    }
    dawn::RenderPipeline CreatePipelineForTest() {
        utils::ComboRenderPipelineDescriptor pipelineDescriptor(device);
        const char* vs =
            R"(#version 450
        const vec3 pos[6] = vec3[6](vec3(-1.0f, -1.0f, 0.0f),
                                    vec3(-1.0f,  1.0f, 0.0f),
                                    vec3( 1.0f, -1.0f, 0.0f),
                                    vec3( 1.0f,  1.0f, 0.0f),
                                    vec3(-1.0f,  1.0f, 0.0f),
                                    vec3( 1.0f, -1.0f, 0.0f)
                                    );

        void main() {
           gl_Position = vec4(pos[gl_VertexIndex], 1.0);
        })";
        pipelineDescriptor.cVertexStage.module =
            utils::CreateShaderModule(device, dawn::ShaderStage::Vertex, vs);

        const char* fs =
            "#version 450\n"
            "layout(location = 0) out vec4 fragColor;"
            "void main() {\n"
            "   fragColor = vec4(1.0, 0.0, 0.0, 1.0);\n"
            "}\n";
        pipelineDescriptor.cFragmentStage.module =
            utils::CreateShaderModule(device, dawn::ShaderStage::Fragment, fs);

        pipelineDescriptor.cDepthStencilState.depthCompare = dawn::CompareFunction::Equal;
        pipelineDescriptor.cDepthStencilState.stencilFront.compare = dawn::CompareFunction::Equal;
        pipelineDescriptor.depthStencilState = &pipelineDescriptor.cDepthStencilState;

        return device.CreateRenderPipeline(&pipelineDescriptor);
    }
    constexpr static uint32_t kSize = 128;
    constexpr static dawn::TextureFormat kColorFormat = dawn::TextureFormat::RGBA8Unorm;
    constexpr static dawn::TextureFormat kDepthStencilFormat =
        dawn::TextureFormat::Depth24PlusStencil8;
};

// This tests that the code path of CopyTextureToBuffer clears correctly to Zero after first usage
TEST_P(TextureZeroInitTest, RecycleTextureMemoryClear) {
    dawn::TextureDescriptor descriptor = CreateTextureDescriptor(
        1, 1, dawn::TextureUsageBit::OutputAttachment | dawn::TextureUsageBit::TransferSrc,
        kColorFormat);
    dawn::Texture texture = device.CreateTexture(&descriptor);

    // Texture's first usage is in EXPECT_PIXEL_RGBA8_EQ's call to CopyTextureToBuffer
    RGBA8 filledWithZeros(0, 0, 0, 0);
    EXPECT_PIXEL_RGBA8_EQ(filledWithZeros, texture, 0, 0);
}

// Test that non-zero mip level clears subresource to Zero after first use
// This goes through the BeginRenderPass's code path
TEST_P(TextureZeroInitTest, MipMapClearsToZero) {
    dawn::TextureDescriptor descriptor = CreateTextureDescriptor(
        4, 1, dawn::TextureUsageBit::OutputAttachment | dawn::TextureUsageBit::TransferSrc,
        kColorFormat);
    dawn::Texture texture = device.CreateTexture(&descriptor);

    dawn::TextureViewDescriptor viewDescriptor = CreateTextureViewDescriptor(2, 0);
    dawn::TextureView view = texture.CreateView(&viewDescriptor);

    utils::BasicRenderPass renderPass = utils::BasicRenderPass(kSize, kSize, texture, kColorFormat);

    renderPass.renderPassInfo.cColorAttachmentsInfoPtr[0]->attachment = view;
    dawn::CommandEncoder encoder = device.CreateCommandEncoder();
    {
        // Texture's first usage is in BeginRenderPass's call to RecordRenderPass
        dawn::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
        pass.EndPass();
    }
    dawn::CommandBuffer commands = encoder.Finish();
    queue.Submit(1, &commands);

    uint32_t mipSize = kSize >> 2;
    std::vector<RGBA8> expected(mipSize * mipSize, {0, 0, 0, 0});

    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), renderPass.color, 0, 0, mipSize, mipSize, 2, 0);
}

// Test that non-zero array layers clears subresource to Zero after first use.
// This goes through the BeginRenderPass's code path
TEST_P(TextureZeroInitTest, ArrayLayerClearsToZero) {
    dawn::TextureDescriptor descriptor = CreateTextureDescriptor(
        1, 4, dawn::TextureUsageBit::OutputAttachment | dawn::TextureUsageBit::TransferSrc,
        kColorFormat);
    dawn::Texture texture = device.CreateTexture(&descriptor);

    dawn::TextureViewDescriptor viewDescriptor = CreateTextureViewDescriptor(0, 2);
    dawn::TextureView view = texture.CreateView(&viewDescriptor);

    utils::BasicRenderPass renderPass = utils::BasicRenderPass(kSize, kSize, texture, kColorFormat);

    renderPass.renderPassInfo.cColorAttachmentsInfoPtr[0]->attachment = view;
    dawn::CommandEncoder encoder = device.CreateCommandEncoder();
    {
        dawn::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass.renderPassInfo);
        pass.EndPass();
    }
    dawn::CommandBuffer commands = encoder.Finish();
    queue.Submit(1, &commands);

    std::vector<RGBA8> expected(kSize * kSize, {0, 0, 0, 0});

    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), renderPass.color, 0, 0, kSize, kSize, 0, 2);
}

// This tests CopyBufferToTexture fully overwrites copy so lazy init is not needed.
// TODO(natlee@microsoft.com): Add backdoor to dawn native to query the number of zero-inited
// subresources
TEST_P(TextureZeroInitTest, CopyBufferToTexture) {
    dawn::TextureDescriptor descriptor = CreateTextureDescriptor(
        4, 1,
        dawn::TextureUsageBit::TransferDst | dawn::TextureUsageBit::Sampled |
            dawn::TextureUsageBit::TransferSrc,
        kColorFormat);
    dawn::Texture texture = device.CreateTexture(&descriptor);

    std::vector<uint8_t> data(4 * kSize * kSize, 100);
    dawn::Buffer stagingBuffer = utils::CreateBufferFromData(
        device, data.data(), static_cast<uint32_t>(data.size()), dawn::BufferUsageBit::TransferSrc);
    dawn::BufferCopyView bufferCopyView = utils::CreateBufferCopyView(stagingBuffer, 0, 0, 0);
    dawn::TextureCopyView textureCopyView = utils::CreateTextureCopyView(texture, 0, 0, {0, 0, 0});
    dawn::Extent3D copySize = {kSize, kSize, 1};
    dawn::CommandEncoder encoder = device.CreateCommandEncoder();
    encoder.CopyBufferToTexture(&bufferCopyView, &textureCopyView, &copySize);
    dawn::CommandBuffer commands = encoder.Finish();
    queue.Submit(1, &commands);

    std::vector<RGBA8> expected(kSize * kSize, {100, 100, 100, 100});

    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), texture, 0, 0, kSize, kSize, 0, 0);
}

// Test for a copy only to a subset of the subresource, lazy init is necessary to clear the other
// half.
TEST_P(TextureZeroInitTest, CopyBufferToTextureHalf) {
    dawn::TextureDescriptor descriptor = CreateTextureDescriptor(
        4, 1,
        dawn::TextureUsageBit::TransferDst | dawn::TextureUsageBit::Sampled |
            dawn::TextureUsageBit::TransferSrc,
        kColorFormat);
    dawn::Texture texture = device.CreateTexture(&descriptor);

    std::vector<uint8_t> data(4 * kSize * kSize, 100);
    dawn::Buffer stagingBuffer = utils::CreateBufferFromData(
        device, data.data(), static_cast<uint32_t>(data.size()), dawn::BufferUsageBit::TransferSrc);
    dawn::BufferCopyView bufferCopyView = utils::CreateBufferCopyView(stagingBuffer, 0, 0, 0);
    dawn::TextureCopyView textureCopyView = utils::CreateTextureCopyView(texture, 0, 0, {0, 0, 0});
    dawn::Extent3D copySize = {kSize / 2, kSize, 1};
    dawn::CommandEncoder encoder = device.CreateCommandEncoder();
    encoder.CopyBufferToTexture(&bufferCopyView, &textureCopyView, &copySize);
    dawn::CommandBuffer commands = encoder.Finish();
    queue.Submit(1, &commands);

    std::vector<RGBA8> expected100((kSize / 2) * kSize, {100, 100, 100, 100});
    std::vector<RGBA8> expectedZeros((kSize / 2) * kSize, {0, 0, 0, 0});
    // first half filled with 100, by the buffer data
    EXPECT_TEXTURE_RGBA8_EQ(expected100.data(), texture, 0, 0, kSize / 2, kSize, 0, 0);
    // second half should be cleared
    EXPECT_TEXTURE_RGBA8_EQ(expectedZeros.data(), texture, kSize / 2, 0, kSize / 2, kSize, 0, 0);
}

// This tests CopyTextureToTexture fully overwrites copy so lazy init is not needed.
TEST_P(TextureZeroInitTest, CopyTextureToTexture) {
    dawn::TextureDescriptor srcDescriptor = CreateTextureDescriptor(
        1, 1, dawn::TextureUsageBit::Sampled | dawn::TextureUsageBit::TransferSrc, kColorFormat);
    dawn::Texture srcTexture = device.CreateTexture(&srcDescriptor);

    dawn::TextureCopyView srcTextureCopyView =
        utils::CreateTextureCopyView(srcTexture, 0, 0, {0, 0, 0});

    dawn::TextureDescriptor dstDescriptor = CreateTextureDescriptor(
        1, 1,
        dawn::TextureUsageBit::OutputAttachment | dawn::TextureUsageBit::TransferDst |
            dawn::TextureUsageBit::TransferSrc,
        kColorFormat);
    dawn::Texture dstTexture = device.CreateTexture(&dstDescriptor);

    dawn::TextureCopyView dstTextureCopyView =
        utils::CreateTextureCopyView(dstTexture, 0, 0, {0, 0, 0});

    dawn::Extent3D copySize = {kSize, kSize, 1};

    dawn::CommandEncoder encoder = device.CreateCommandEncoder();
    encoder.CopyTextureToTexture(&srcTextureCopyView, &dstTextureCopyView, &copySize);
    dawn::CommandBuffer commands = encoder.Finish();
    queue.Submit(1, &commands);

    std::vector<RGBA8> expected(kSize * kSize, {0, 0, 0, 0});

    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), srcTexture, 0, 0, kSize, kSize, 0, 0);
    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), dstTexture, 0, 0, kSize, kSize, 0, 0);
}

// This Tests the CopyTextureToTexture's copy only to a subset of the subresource, lazy init is
// necessary to clear the other half.
TEST_P(TextureZeroInitTest, CopyTextureToTextureHalf) {
    dawn::TextureDescriptor srcDescriptor = CreateTextureDescriptor(
        1, 1,
        dawn::TextureUsageBit::Sampled | dawn::TextureUsageBit::TransferSrc |
            dawn::TextureUsageBit::TransferDst,
        kColorFormat);
    dawn::Texture srcTexture = device.CreateTexture(&srcDescriptor);

    // fill srcTexture with 100
    {
        std::vector<uint8_t> data(4 * kSize * kSize, 100);
        dawn::Buffer stagingBuffer =
            utils::CreateBufferFromData(device, data.data(), static_cast<uint32_t>(data.size()),
                                        dawn::BufferUsageBit::TransferSrc);
        dawn::BufferCopyView bufferCopyView = utils::CreateBufferCopyView(stagingBuffer, 0, 0, 0);
        dawn::TextureCopyView textureCopyView =
            utils::CreateTextureCopyView(srcTexture, 0, 0, {0, 0, 0});
        dawn::Extent3D copySize = {kSize, kSize, 1};
        dawn::CommandEncoder encoder = device.CreateCommandEncoder();
        encoder.CopyBufferToTexture(&bufferCopyView, &textureCopyView, &copySize);
        dawn::CommandBuffer commands = encoder.Finish();
        queue.Submit(1, &commands);
    }

    dawn::TextureCopyView srcTextureCopyView =
        utils::CreateTextureCopyView(srcTexture, 0, 0, {0, 0, 0});

    dawn::TextureDescriptor dstDescriptor = CreateTextureDescriptor(
        1, 1,
        dawn::TextureUsageBit::OutputAttachment | dawn::TextureUsageBit::TransferDst |
            dawn::TextureUsageBit::TransferSrc,
        kColorFormat);
    dawn::Texture dstTexture = device.CreateTexture(&dstDescriptor);

    dawn::TextureCopyView dstTextureCopyView =
        utils::CreateTextureCopyView(dstTexture, 0, 0, {0, 0, 0});
    dawn::Extent3D copySize = {kSize / 2, kSize, 1};

    dawn::CommandEncoder encoder = device.CreateCommandEncoder();
    encoder.CopyTextureToTexture(&srcTextureCopyView, &dstTextureCopyView, &copySize);
    dawn::CommandBuffer commands = encoder.Finish();
    queue.Submit(1, &commands);

    std::vector<RGBA8> expectedWithZeros((kSize / 2) * kSize, {0, 0, 0, 0});
    std::vector<RGBA8> expectedWith100(kSize * kSize, {100, 100, 100, 100});

    EXPECT_TEXTURE_RGBA8_EQ(expectedWith100.data(), srcTexture, 0, 0, kSize, kSize, 0, 0);
    EXPECT_TEXTURE_RGBA8_EQ(expectedWith100.data(), dstTexture, 0, 0, kSize / 2, kSize, 0, 0);
    EXPECT_TEXTURE_RGBA8_EQ(expectedWithZeros.data(), dstTexture, kSize / 2, 0, kSize / 2, kSize, 0,
                            0);
}

// This tests the texture with depth attachment and load op load will init depth stencil texture to
// 0s.
TEST_P(TextureZeroInitTest, DepthClear) {
    dawn::TextureDescriptor srcDescriptor = CreateTextureDescriptor(
        1, 1,
        dawn::TextureUsageBit::TransferSrc | dawn::TextureUsageBit::TransferDst |
            dawn::TextureUsageBit::OutputAttachment,
        kColorFormat);
    dawn::Texture srcTexture = device.CreateTexture(&srcDescriptor);

    dawn::TextureDescriptor depthStencilDescriptor = CreateTextureDescriptor(
        1, 1, dawn::TextureUsageBit::OutputAttachment | dawn::TextureUsageBit::TransferSrc,
        kDepthStencilFormat);
    dawn::Texture depthStencilTexture = device.CreateTexture(&depthStencilDescriptor);

    utils::ComboRenderPassDescriptor renderPassDescriptor({srcTexture.CreateDefaultView()},
                                                          depthStencilTexture.CreateDefaultView());
    renderPassDescriptor.cDepthStencilAttachmentInfo.depthLoadOp = dawn::LoadOp::Load;
    renderPassDescriptor.cDepthStencilAttachmentInfo.stencilLoadOp = dawn::LoadOp::Clear;
    renderPassDescriptor.cDepthStencilAttachmentInfo.clearStencil = 0;

    dawn::CommandEncoder encoder = device.CreateCommandEncoder();
    auto pass = encoder.BeginRenderPass(&renderPassDescriptor);
    pass.SetPipeline(CreatePipelineForTest());
    pass.Draw(6, 1, 0, 0);
    pass.EndPass();
    dawn::CommandBuffer commandBuffer = encoder.Finish();
    queue.Submit(1, &commandBuffer);

    // Expect the texture to be red because depth test passed.
    std::vector<RGBA8> expected(kSize * kSize, {255, 0, 0, 255});
    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), srcTexture, 0, 0, kSize, kSize, 0, 0);
}

// This tests the texture with stencil attachment and load op load will init depth stencil texture
// to 0s.
TEST_P(TextureZeroInitTest, StencilClear) {
    dawn::TextureDescriptor srcDescriptor = CreateTextureDescriptor(
        1, 1,
        dawn::TextureUsageBit::TransferSrc | dawn::TextureUsageBit::TransferDst |
            dawn::TextureUsageBit::OutputAttachment,
        kColorFormat);
    dawn::Texture srcTexture = device.CreateTexture(&srcDescriptor);

    dawn::TextureDescriptor depthStencilDescriptor = CreateTextureDescriptor(
        1, 1, dawn::TextureUsageBit::OutputAttachment | dawn::TextureUsageBit::TransferSrc,
        kDepthStencilFormat);
    dawn::Texture depthStencilTexture = device.CreateTexture(&depthStencilDescriptor);

    utils::ComboRenderPassDescriptor renderPassDescriptor({srcTexture.CreateDefaultView()},
                                                          depthStencilTexture.CreateDefaultView());
    renderPassDescriptor.cDepthStencilAttachmentInfo.depthLoadOp = dawn::LoadOp::Clear;
    renderPassDescriptor.cDepthStencilAttachmentInfo.clearDepth = 0.0f;
    renderPassDescriptor.cDepthStencilAttachmentInfo.stencilLoadOp = dawn::LoadOp::Load;

    dawn::CommandEncoder encoder = device.CreateCommandEncoder();
    auto pass = encoder.BeginRenderPass(&renderPassDescriptor);
    pass.SetPipeline(CreatePipelineForTest());
    pass.Draw(6, 1, 0, 0);
    pass.EndPass();
    dawn::CommandBuffer commandBuffer = encoder.Finish();
    queue.Submit(1, &commandBuffer);

    // Expect the texture to be red because stencil test passed.
    std::vector<RGBA8> expected(kSize * kSize, {255, 0, 0, 255});
    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), srcTexture, 0, 0, kSize, kSize, 0, 0);
}

// This tests the texture with depth stencil attachment and load op load will init depth stencil
// texture to 0s.
TEST_P(TextureZeroInitTest, DepthStencilClear) {
    dawn::TextureDescriptor srcDescriptor = CreateTextureDescriptor(
        1, 1,
        dawn::TextureUsageBit::TransferSrc | dawn::TextureUsageBit::TransferDst |
            dawn::TextureUsageBit::OutputAttachment,
        kColorFormat);
    dawn::Texture srcTexture = device.CreateTexture(&srcDescriptor);

    dawn::TextureDescriptor depthStencilDescriptor = CreateTextureDescriptor(
        1, 1, dawn::TextureUsageBit::OutputAttachment | dawn::TextureUsageBit::TransferSrc,
        kDepthStencilFormat);
    dawn::Texture depthStencilTexture = device.CreateTexture(&depthStencilDescriptor);

    utils::ComboRenderPassDescriptor renderPassDescriptor({srcTexture.CreateDefaultView()},
                                                          depthStencilTexture.CreateDefaultView());
    renderPassDescriptor.cDepthStencilAttachmentInfo.depthLoadOp = dawn::LoadOp::Load;
    renderPassDescriptor.cDepthStencilAttachmentInfo.stencilLoadOp = dawn::LoadOp::Load;

    dawn::CommandEncoder encoder = device.CreateCommandEncoder();
    auto pass = encoder.BeginRenderPass(&renderPassDescriptor);
    pass.SetPipeline(CreatePipelineForTest());
    pass.Draw(6, 1, 0, 0);
    pass.EndPass();
    dawn::CommandBuffer commandBuffer = encoder.Finish();
    queue.Submit(1, &commandBuffer);

    // Expect the texture to be red because both depth and stencil tests passed.
    std::vector<RGBA8> expected(kSize * kSize, {255, 0, 0, 255});
    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), srcTexture, 0, 0, kSize, kSize, 0, 0);
}

DAWN_INSTANTIATE_TEST(TextureZeroInitTest,
                      ForceWorkarounds(D3D12Backend,
                                       {"nonzero_clear_resources_on_creation_for_testing"}),
                      ForceWorkarounds(VulkanBackend,
                                       {"nonzero_clear_resources_on_creation_for_testing"}));