// Copyright 2018 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/unittests/validation/ValidationTest.h"

#include "common/Constants.h"
#include "utils/ComboRenderPipelineDescriptor.h"
#include "utils/WGPUHelpers.h"

namespace {

class TextureValidationTest : public ValidationTest {
  protected:
    wgpu::TextureDescriptor CreateDefaultTextureDescriptor() {
        wgpu::TextureDescriptor descriptor;
        descriptor.size.width = kWidth;
        descriptor.size.height = kHeight;
        descriptor.size.depth = 1;
        descriptor.arrayLayerCount = kDefaultArraySize;
        descriptor.mipLevelCount = kDefaultMipLevels;
        descriptor.sampleCount = kDefaultSampleCount;
        descriptor.dimension = wgpu::TextureDimension::e2D;
        descriptor.format = kDefaultTextureFormat;
        descriptor.usage = wgpu::TextureUsage::OutputAttachment | wgpu::TextureUsage::Sampled;
        return descriptor;
    }

    wgpu::Queue queue = device.CreateQueue();

  private:
    static constexpr uint32_t kWidth = 32;
    static constexpr uint32_t kHeight = 32;
    static constexpr uint32_t kDefaultArraySize = 1;
    static constexpr uint32_t kDefaultMipLevels = 1;
    static constexpr uint32_t kDefaultSampleCount = 1;

    static constexpr wgpu::TextureFormat kDefaultTextureFormat = wgpu::TextureFormat::RGBA8Unorm;
};

// Test the validation of sample count
TEST_F(TextureValidationTest, SampleCount) {
    wgpu::TextureDescriptor defaultDescriptor = CreateDefaultTextureDescriptor();

    // sampleCount == 1 is allowed.
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.sampleCount = 1;

        device.CreateTexture(&descriptor);
    }

    // sampleCount == 4 is allowed.
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.sampleCount = 4;

        device.CreateTexture(&descriptor);
    }

    // It is an error to create a texture with an invalid sampleCount.
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.sampleCount = 3;

        ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
    }

    // It is an error to create a multisampled texture with mipLevelCount > 1.
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.sampleCount = 4;
        descriptor.mipLevelCount = 2;

        ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
    }

    // Currently we do not support multisampled 2D array textures.
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.sampleCount = 4;
        descriptor.arrayLayerCount = 2;

        ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
    }
}

// Test the validation of the mip level count
TEST_F(TextureValidationTest, MipLevelCount) {
    wgpu::TextureDescriptor defaultDescriptor = CreateDefaultTextureDescriptor();

    // mipLevelCount == 1 is allowed
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.size.width = 32;
        descriptor.size.height = 32;
        descriptor.mipLevelCount = 1;

        device.CreateTexture(&descriptor);
    }

    // mipLevelCount == 0 is an error
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.size.width = 32;
        descriptor.size.height = 32;
        descriptor.mipLevelCount = 0;

        ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
    }

    // Full mip chains are allowed
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.size.width = 32;
        descriptor.size.height = 32;
        // Mip level sizes: 32, 16, 8, 4, 2, 1
        descriptor.mipLevelCount = 6;

        device.CreateTexture(&descriptor);
    }

    // Too big mip chains on width are disallowed
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.size.width = 31;
        descriptor.size.height = 32;
        // Mip level width: 31, 15, 7, 3, 1, 1
        descriptor.mipLevelCount = 7;

        ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
    }

    // Too big mip chains on height are disallowed
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.size.width = 32;
        descriptor.size.height = 31;
        // Mip level height: 31, 15, 7, 3, 1, 1
        descriptor.mipLevelCount = 7;

        ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
    }

    // Undefined shift check if miplevel is bigger than the integer bit width.
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.size.width = 32;
        descriptor.size.height = 32;
        descriptor.mipLevelCount = 100;

        ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
    }

    // Non square mip map halves the resolution until a 1x1 dimension.
    {
        wgpu::TextureDescriptor descriptor = defaultDescriptor;
        descriptor.size.width = 32;
        descriptor.size.height = 8;
        // Mip maps: 32 * 8, 16 * 4, 8 * 2, 4 * 1, 2 * 1, 1 * 1
        descriptor.mipLevelCount = 6;

        device.CreateTexture(&descriptor);
    }
}

// Test that it is valid to destroy a texture
TEST_F(TextureValidationTest, DestroyTexture) {
    wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
    wgpu::Texture texture = device.CreateTexture(&descriptor);
    texture.Destroy();
}

// Test that it's valid to destroy a destroyed texture
TEST_F(TextureValidationTest, DestroyDestroyedTexture) {
    wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
    wgpu::Texture texture = device.CreateTexture(&descriptor);
    texture.Destroy();
    texture.Destroy();
}

// Test that it's invalid to submit a destroyed texture in a queue
// in the case of destroy, encode, submit
TEST_F(TextureValidationTest, DestroyEncodeSubmit) {
    wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
    wgpu::Texture texture = device.CreateTexture(&descriptor);
    wgpu::TextureView textureView = texture.CreateView();

    utils::ComboRenderPassDescriptor renderPass({textureView});

    // Destroy the texture
    texture.Destroy();

    wgpu::CommandEncoder encoder_post_destroy = device.CreateCommandEncoder();
    {
        wgpu::RenderPassEncoder pass = encoder_post_destroy.BeginRenderPass(&renderPass);
        pass.EndPass();
    }
    wgpu::CommandBuffer commands = encoder_post_destroy.Finish();

    // Submit should fail due to destroyed texture
    ASSERT_DEVICE_ERROR(queue.Submit(1, &commands));
}

// Test that it's invalid to submit a destroyed texture in a queue
// in the case of encode, destroy, submit
TEST_F(TextureValidationTest, EncodeDestroySubmit) {
    wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
    wgpu::Texture texture = device.CreateTexture(&descriptor);
    wgpu::TextureView textureView = texture.CreateView();

    utils::ComboRenderPassDescriptor renderPass({textureView});

    wgpu::CommandEncoder encoder = device.CreateCommandEncoder();
    {
        wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass);
        pass.EndPass();
    }
    wgpu::CommandBuffer commands = encoder.Finish();

    // Destroy the texture
    texture.Destroy();

    // Submit should fail due to destroyed texture
    ASSERT_DEVICE_ERROR(queue.Submit(1, &commands));
}

// Test it is an error to create an OutputAttachment texture with a non-renderable format.
TEST_F(TextureValidationTest, NonRenderableAndOutputAttachment) {
    wgpu::TextureDescriptor descriptor;
    descriptor.size = {1, 1, 1};
    descriptor.usage = wgpu::TextureUsage::OutputAttachment;

    // Succeeds because RGBA8Unorm is renderable
    descriptor.format = wgpu::TextureFormat::RGBA8Unorm;
    device.CreateTexture(&descriptor);

    wgpu::TextureFormat nonRenderableFormats[] = {
        wgpu::TextureFormat::RG11B10Float,
        wgpu::TextureFormat::R8Snorm,
        wgpu::TextureFormat::RG8Snorm,
        wgpu::TextureFormat::RGBA8Snorm,
    };

    for (wgpu::TextureFormat format : nonRenderableFormats) {
        // Fails because `format` is non-renderable
        descriptor.format = format;
        ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
    }
}

// Test it is an error to create a texture with format "Undefined".
TEST_F(TextureValidationTest, TextureFormatUndefined) {
    wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
    descriptor.format = wgpu::TextureFormat::Undefined;
    ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
}

// TODO(jiawei.shao@intel.com): add tests to verify we cannot create 1D or 3D textures with
// compressed texture formats.
class CompressedTextureFormatsValidationTests : public TextureValidationTest {
  public:
    CompressedTextureFormatsValidationTests() : TextureValidationTest() {
        device = CreateDeviceFromAdapter(adapter, {"texture_compression_bc"});
    }

  protected:
    wgpu::TextureDescriptor CreateDefaultTextureDescriptor() {
        wgpu::TextureDescriptor descriptor =
            TextureValidationTest::CreateDefaultTextureDescriptor();
        descriptor.usage =
            wgpu::TextureUsage::CopySrc | wgpu::TextureUsage::CopyDst | wgpu::TextureUsage::Sampled;
        return descriptor;
    }

    const std::array<wgpu::TextureFormat, 14> kBCFormats = {
        wgpu::TextureFormat::BC1RGBAUnorm,  wgpu::TextureFormat::BC1RGBAUnormSrgb,
        wgpu::TextureFormat::BC2RGBAUnorm,  wgpu::TextureFormat::BC2RGBAUnormSrgb,
        wgpu::TextureFormat::BC3RGBAUnorm,  wgpu::TextureFormat::BC3RGBAUnormSrgb,
        wgpu::TextureFormat::BC4RUnorm,     wgpu::TextureFormat::BC4RSnorm,
        wgpu::TextureFormat::BC5RGUnorm,    wgpu::TextureFormat::BC5RGSnorm,
        wgpu::TextureFormat::BC6HRGBUfloat, wgpu::TextureFormat::BC6HRGBSfloat,
        wgpu::TextureFormat::BC7RGBAUnorm,  wgpu::TextureFormat::BC7RGBAUnormSrgb};
};

// Test the validation of texture size when creating textures in compressed texture formats.
TEST_F(CompressedTextureFormatsValidationTests, TextureSize) {
    // Test that it is invalid to use a number that is not a multiple of 4 (the compressed block
    // width and height of all BC formats) as the width or height of textures in BC formats.
    for (wgpu::TextureFormat format : kBCFormats) {
        {
            wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
            descriptor.format = format;
            ASSERT_TRUE(descriptor.size.width % 4 == 0 && descriptor.size.height % 4 == 0);
            device.CreateTexture(&descriptor);
        }

        {
            wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
            descriptor.format = format;
            descriptor.size.width = 31;
            ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
        }

        {
            wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
            descriptor.format = format;
            descriptor.size.height = 31;
            ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
        }

        {
            wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
            descriptor.format = format;
            descriptor.size.width = 12;
            descriptor.size.height = 32;
            device.CreateTexture(&descriptor);
        }
    }
}

// Test the creation of a texture with BC format will fail when the extension textureCompressionBC
// is not enabled.
TEST_F(CompressedTextureFormatsValidationTests, UseBCFormatWithoutEnablingExtension) {
    const std::vector<const char*> kEmptyVector;
    wgpu::Device deviceWithoutExtension = CreateDeviceFromAdapter(adapter, kEmptyVector);
    for (wgpu::TextureFormat format : kBCFormats) {
        wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
        descriptor.format = format;
        ASSERT_DEVICE_ERROR(deviceWithoutExtension.CreateTexture(&descriptor));
    }
}

// Test the validation of texture usages when creating textures in compressed texture formats.
TEST_F(CompressedTextureFormatsValidationTests, TextureUsage) {
    // Test that only CopySrc, CopyDst and Sampled are accepted as the texture usage of the
    // textures in BC formats.
    for (wgpu::TextureFormat format : kBCFormats) {
        {
            wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
            descriptor.format = format;
            descriptor.usage = wgpu::TextureUsage::OutputAttachment;
            ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
        }

        {
            wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
            descriptor.format = format;
            descriptor.usage = wgpu::TextureUsage::Storage;
            ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
        }

        {
            wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
            descriptor.format = format;
            descriptor.usage = wgpu::TextureUsage::Present;
            ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
        }
    }
}

// Test the validation of sample count when creating textures in compressed texture formats.
TEST_F(CompressedTextureFormatsValidationTests, SampleCount) {
    // Test that it is invalid to specify SampleCount > 1 when we create a texture in BC formats.
    for (wgpu::TextureFormat format : kBCFormats) {
        wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
        descriptor.format = format;
        descriptor.sampleCount = 4;
        ASSERT_DEVICE_ERROR(device.CreateTexture(&descriptor));
    }
}

// Test the validation of creating 2D array textures in compressed texture formats.
TEST_F(CompressedTextureFormatsValidationTests, 2DArrayTexture) {
    // Test that it is allowed to create a 2D array texture in BC formats.
    for (wgpu::TextureFormat format : kBCFormats) {
        wgpu::TextureDescriptor descriptor = CreateDefaultTextureDescriptor();
        descriptor.format = format;
        descriptor.arrayLayerCount = 6;
        device.CreateTexture(&descriptor);
    }
}

}  // namespace