//-------------------------------------------------------------------------------------
// BCDirectCompute.h
//  
// Direct3D 11 Compute Shader BC Compressor
//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
//-------------------------------------------------------------------------------------

#pragma once

namespace DirectX
{

    class GPUCompressBC
    {
    public:
        GPUCompressBC() noexcept;

        HRESULT Initialize(_In_ ID3D11Device* pDevice);

        HRESULT Prepare(size_t width, size_t height, uint32_t flags, DXGI_FORMAT format, float alphaWeight);

        HRESULT Compress(const Image& srcImage, const Image& destImage);

        DXGI_FORMAT GetSourceFormat() const noexcept { return m_srcformat; }

    private:
        DXGI_FORMAT                                         m_bcformat;
        DXGI_FORMAT                                         m_srcformat;
        float                                               m_alphaWeight;
        bool                                                m_bc7_mode02;
        bool                                                m_bc7_mode137;
        size_t                                              m_width;
        size_t                                              m_height;

        Microsoft::WRL::ComPtr<ID3D11Device>                m_device;
        Microsoft::WRL::ComPtr<ID3D11DeviceContext>         m_context;

        Microsoft::WRL::ComPtr<ID3D11Buffer>                m_err1;
        Microsoft::WRL::ComPtr<ID3D11UnorderedAccessView>   m_err1UAV;
        Microsoft::WRL::ComPtr<ID3D11ShaderResourceView>    m_err1SRV;

        Microsoft::WRL::ComPtr<ID3D11Buffer>                m_err2;
        Microsoft::WRL::ComPtr<ID3D11UnorderedAccessView>   m_err2UAV;
        Microsoft::WRL::ComPtr<ID3D11ShaderResourceView>    m_err2SRV;

        Microsoft::WRL::ComPtr<ID3D11Buffer>                m_output;
        Microsoft::WRL::ComPtr<ID3D11Buffer>                m_outputCPU;
        Microsoft::WRL::ComPtr<ID3D11UnorderedAccessView>   m_outputUAV;
        Microsoft::WRL::ComPtr<ID3D11Buffer>                m_constBuffer;

        // Compute shader library
        Microsoft::WRL::ComPtr<ID3D11ComputeShader>         m_BC6H_tryModeG10CS;
        Microsoft::WRL::ComPtr<ID3D11ComputeShader>         m_BC6H_tryModeLE10CS;
        Microsoft::WRL::ComPtr<ID3D11ComputeShader>         m_BC6H_encodeBlockCS;

        Microsoft::WRL::ComPtr<ID3D11ComputeShader>         m_BC7_tryMode456CS;
        Microsoft::WRL::ComPtr<ID3D11ComputeShader>         m_BC7_tryMode137CS;
        Microsoft::WRL::ComPtr<ID3D11ComputeShader>         m_BC7_tryMode02CS;
        Microsoft::WRL::ComPtr<ID3D11ComputeShader>         m_BC7_encodeBlockCS;
    };

} // namespace