// Copyright 2026 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef SRC_DAWN_COMMON_EXTERNALTEXTUREPARAMS_H_
#define SRC_DAWN_COMMON_EXTERNALTEXTUREPARAMS_H_

#include <webgpu/webgpu_cpp.h>

#include <array>

namespace dawn {

// Color space parameters that can be passed to an ExternalTexture.
struct ExternalTextureColorSpaceParams {
    // Stored row-major to save uniform buffer space. (so one full row after another)
    // TODO(https://crbug.com/496604550): That's an implementation detail that should not be exposed
    // in the API, Dawn can transpose internally.
    std::array<float, 12> yuvToRgbConversionMatrix;
    std::array<float, 7> srcTransferFunction = {};
    std::array<float, 7> dstTransferFunction = {};  // Really the inverse transfer function.
    // Stored column major to match WGSL. (so one full column after another)
    std::array<float, 9> gamutConversionMatrix;
};

// Helper function to make parameters for an ExternalTextureDescriptor
wgpu::Status ComputeExternalTextureParams(const wgpu::ColorSpaceDawn& srcColorSpace,
                                          wgpu::PredefinedColorSpace dstColorSpace,
                                          ExternalTextureColorSpaceParams* out);

ExternalTextureColorSpaceParams GetNoopColorSpaceParams();

}  // namespace dawn

#endif  // SRC_DAWN_COMMON_EXTERNALTEXTUREPARAMS_H_
