// Copyright 2020 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.

#ifndef SRC_DAWN_UTILS_TESTUTILS_H_
#define SRC_DAWN_UTILS_TESTUTILS_H_

#include "dawn/webgpu_cpp.h"

namespace utils {

struct RGBA8 {
    constexpr RGBA8() : RGBA8(0, 0, 0, 0) {}
    constexpr RGBA8(uint8_t r, uint8_t g, uint8_t b, uint8_t a) : r(r), g(g), b(b), a(a) {}
    bool operator==(const RGBA8& other) const;
    bool operator!=(const RGBA8& other) const;
    bool operator<=(const RGBA8& other) const;
    bool operator>=(const RGBA8& other) const;

    uint8_t r, g, b, a;

    static const RGBA8 kZero;
    static const RGBA8 kBlack;
    static const RGBA8 kRed;
    static const RGBA8 kGreen;
    static const RGBA8 kBlue;
    static const RGBA8 kYellow;
    static const RGBA8 kWhite;
};
std::ostream& operator<<(std::ostream& stream, const RGBA8& color);

struct TextureDataCopyLayout {
    uint64_t byteLength;
    uint64_t texelBlockCount;
    uint32_t bytesPerRow;
    uint32_t rowsPerImage;
    uint32_t texelBlocksPerRow;
    uint32_t bytesPerImage;
    uint32_t texelBlocksPerImage;
    wgpu::Extent3D mipSize;
};

uint32_t GetMinimumBytesPerRow(wgpu::TextureFormat format, uint32_t width);
TextureDataCopyLayout GetTextureDataCopyLayoutForTextureAtLevel(
    wgpu::TextureFormat format,
    wgpu::Extent3D textureSizeAtLevel0,
    uint32_t mipmapLevel,
    wgpu::TextureDimension dimension = wgpu::TextureDimension::e2D,
    uint32_t rowsPerImage = wgpu::kCopyStrideUndefined);

uint64_t RequiredBytesInCopy(uint64_t bytesPerRow,
                             uint64_t rowsPerImage,
                             wgpu::Extent3D copyExtent,
                             wgpu::TextureFormat textureFormat);
uint64_t RequiredBytesInCopy(uint64_t bytesPerRow,
                             uint64_t rowsPerImage,
                             uint64_t widthInBlocks,
                             uint64_t heightInBlocks,
                             uint64_t depth,
                             uint64_t bytesPerBlock);

uint64_t GetTexelCountInCopyRegion(uint64_t bytesPerRow,
                                   uint64_t rowsPerImage,
                                   wgpu::Extent3D copyExtent,
                                   wgpu::TextureFormat textureFormat);

// A helper function used for testing DynamicUploader offset alignment.
// A call of this function will do a Queue::WriteTexture with 1 byte of data,
// so that assuming that WriteTexture uses DynamicUploader, the first RingBuffer
// in it will contain 1 byte of data.
void UnalignDynamicUploader(wgpu::Device device);

uint32_t VertexFormatSize(wgpu::VertexFormat format);

}  // namespace utils

#endif  // SRC_DAWN_UTILS_TESTUTILS_H_