// 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/WGPUHelpers.h"

class NonzeroTextureCreationTests : public DawnTest {
  protected:
    void TestSetUp() override {
        DawnTest::TestSetUp();
    }

    constexpr static uint32_t kSize = 128;
};

// Test that texture clears to 1's because toggle is enabled.
TEST_P(NonzeroTextureCreationTests, TextureCreationClearsOneBits) {
    wgpu::TextureDescriptor descriptor;
    descriptor.dimension = wgpu::TextureDimension::e2D;
    descriptor.size.width = kSize;
    descriptor.size.height = kSize;
    descriptor.size.depth = 1;
    descriptor.arrayLayerCount = 1;
    descriptor.sampleCount = 1;
    descriptor.format = wgpu::TextureFormat::RGBA8Unorm;
    descriptor.mipLevelCount = 1;
    descriptor.usage = wgpu::TextureUsage::OutputAttachment | wgpu::TextureUsage::CopySrc;
    wgpu::Texture texture = device.CreateTexture(&descriptor);

    RGBA8 filledWithOnes(255, 255, 255, 255);
    EXPECT_PIXEL_RGBA8_EQ(filledWithOnes, texture, 0, 0);
}

// Test that non-zero mip level clears to 1's because toggle is enabled.
TEST_P(NonzeroTextureCreationTests, MipMapClears) {
    constexpr uint32_t mipLevels = 4;

    wgpu::TextureDescriptor descriptor;
    descriptor.dimension = wgpu::TextureDimension::e2D;
    descriptor.size.width = kSize;
    descriptor.size.height = kSize;
    descriptor.size.depth = 1;
    descriptor.arrayLayerCount = 1;
    descriptor.sampleCount = 1;
    descriptor.format = wgpu::TextureFormat::RGBA8Unorm;
    descriptor.mipLevelCount = mipLevels;
    descriptor.usage = wgpu::TextureUsage::OutputAttachment | wgpu::TextureUsage::CopySrc;
    wgpu::Texture texture = device.CreateTexture(&descriptor);

    std::vector<RGBA8> expected;
    RGBA8 filledWithOnes(255, 255, 255, 255);
    for (uint32_t i = 0; i < kSize * kSize; ++i) {
        expected.push_back(filledWithOnes);
    }
    uint32_t mipSize = kSize >> 2;
    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), texture, 0, 0, mipSize, mipSize, 2, 0);
}

// Test that non-zero array layers clears to 1's because toggle is enabled.
TEST_P(NonzeroTextureCreationTests, ArrayLayerClears) {
    constexpr uint32_t arrayLayers = 4;

    wgpu::TextureDescriptor descriptor;
    descriptor.dimension = wgpu::TextureDimension::e2D;
    descriptor.size.width = kSize;
    descriptor.size.height = kSize;
    descriptor.size.depth = 1;
    descriptor.arrayLayerCount = arrayLayers;
    descriptor.sampleCount = 1;
    descriptor.format = wgpu::TextureFormat::RGBA8Unorm;
    descriptor.mipLevelCount = 1;
    descriptor.usage = wgpu::TextureUsage::OutputAttachment | wgpu::TextureUsage::CopySrc;
    wgpu::Texture texture = device.CreateTexture(&descriptor);

    std::vector<RGBA8> expected;
    RGBA8 filledWithOnes(255, 255, 255, 255);
    for (uint32_t i = 0; i < kSize * kSize; ++i) {
        expected.push_back(filledWithOnes);
    }

    EXPECT_TEXTURE_RGBA8_EQ(expected.data(), texture, 0, 0, kSize, kSize, 0, 2);
}

// Test that nonrenderable texture formats clear to 1's because toggle is enabled
TEST_P(NonzeroTextureCreationTests, NonrenderableTextureFormat) {
    wgpu::TextureDescriptor descriptor;
    descriptor.dimension = wgpu::TextureDimension::e2D;
    descriptor.size.width = kSize;
    descriptor.size.height = kSize;
    descriptor.size.depth = 1;
    descriptor.arrayLayerCount = 1;
    descriptor.sampleCount = 1;
    descriptor.format = wgpu::TextureFormat::RGBA8Snorm;
    descriptor.mipLevelCount = 1;
    descriptor.usage = wgpu::TextureUsage::CopySrc;
    wgpu::Texture texture = device.CreateTexture(&descriptor);

    // Set buffer with dirty data so we know it is cleared by the lazy cleared texture copy
    uint32_t bufferSize = 4 * kSize * kSize;
    std::vector<uint8_t> data(bufferSize, 100);
    wgpu::Buffer bufferDst = utils::CreateBufferFromData(
        device, data.data(), static_cast<uint32_t>(data.size()), wgpu::BufferUsage::CopySrc);

    wgpu::BufferCopyView bufferCopyView = utils::CreateBufferCopyView(bufferDst, 0, 0, 0);
    wgpu::TextureCopyView textureCopyView = utils::CreateTextureCopyView(texture, 0, 0, {0, 0, 0});
    wgpu::Extent3D copySize = {kSize, kSize, 1};

    wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
    encoder.CopyTextureToBuffer(&textureCopyView, &bufferCopyView, &copySize);
    wgpu::CommandBuffer commands = encoder.Finish();
    queue.Submit(1, &commands);

    std::vector<uint32_t> expected(bufferSize, 1);
    EXPECT_BUFFER_U32_RANGE_EQ(expected.data(), bufferDst, 0, 8);
}

// Test that textures with more than 1 array layers and nonrenderable texture formats clear to 1's
// because toggle is enabled
TEST_P(NonzeroTextureCreationTests, NonRenderableTextureClearWithMultiArrayLayers) {
    // TODO(natlee@microsoft.com): skip for now on opengl because TextureClear nonrenderable
    // textures does not create large enough buffers for array layers greater than 1.
    DAWN_SKIP_TEST_IF(IsOpenGL());

    wgpu::TextureDescriptor descriptor;
    descriptor.dimension = wgpu::TextureDimension::e2D;
    descriptor.size.width = kSize;
    descriptor.size.height = kSize;
    descriptor.size.depth = 1;
    descriptor.arrayLayerCount = 2;
    descriptor.sampleCount = 1;
    descriptor.format = wgpu::TextureFormat::RGBA8Snorm;
    descriptor.mipLevelCount = 1;
    descriptor.usage = wgpu::TextureUsage::CopySrc;
    wgpu::Texture texture = device.CreateTexture(&descriptor);

    // Set buffer with dirty data so we know it is cleared by the lazy cleared texture copy
    uint32_t bufferSize = 4 * kSize * kSize;
    std::vector<uint8_t> data(bufferSize, 100);
    wgpu::Buffer bufferDst = utils::CreateBufferFromData(
        device, data.data(), static_cast<uint32_t>(data.size()), wgpu::BufferUsage::CopySrc);

    wgpu::BufferCopyView bufferCopyView = utils::CreateBufferCopyView(bufferDst, 0, 0, 0);
    wgpu::TextureCopyView textureCopyView = utils::CreateTextureCopyView(texture, 0, 1, {0, 0, 0});
    wgpu::Extent3D copySize = {kSize, kSize, 1};

    wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
    encoder.CopyTextureToBuffer(&textureCopyView, &bufferCopyView, &copySize);
    wgpu::CommandBuffer commands = encoder.Finish();
    queue.Submit(1, &commands);

    std::vector<uint32_t> expectedWithZeros(bufferSize, 1);
    EXPECT_BUFFER_U32_RANGE_EQ(expectedWithZeros.data(), bufferDst, 0, 8);
}

DAWN_INSTANTIATE_TEST(NonzeroTextureCreationTests,
                      ForceToggles(D3D12Backend,
                                   {"nonzero_clear_resources_on_creation_for_testing"},
                                   {"lazy_clear_resource_on_first_use"}),
                      ForceToggles(OpenGLBackend,
                                   {"nonzero_clear_resources_on_creation_for_testing"},
                                   {"lazy_clear_resource_on_first_use"}),
                      ForceToggles(VulkanBackend,
                                   {"nonzero_clear_resources_on_creation_for_testing"},
                                   {"lazy_clear_resource_on_first_use"}));