NVIDIA-AI-Image-Scaling-SDK/samples/DX11/include/BilinearUpscale.h

// The MIT License(MIT)
//
// Copyright(c) 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
//
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// this software and associated documentation files(the "Software"), to deal in
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// The above copyright notice and this permission notice shall be included in all
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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#pragma once

#include <dxgi1_4.h>
#include <d3d11_3.h>

#include "DeviceResources.h"

__declspec(align(16))
struct BilinearUpscaleConfig
{
    uint32_t kInputViewportOriginX;
    uint32_t kInputViewportOriginY;
    uint32_t kInputViewportWidth;
    uint32_t kInputViewportHeight;
    uint32_t kOutputViewportOriginX;
    uint32_t kOutputViewportOriginY;
    uint32_t kOutputViewportWidth;
    uint32_t kOutputViewportHeight;
    float    kScaleX;
    float    kScaleY;
    float    kDstNormX;
    float    kDstNormY;
    float    kSrcNormX;
    float    kSrcNormY;
};

void BilinearUpdateConfig(BilinearUpscaleConfig& config,
    uint32_t inputViewportOriginX, uint32_t inputViewportOriginY,
    uint32_t inputViewportWidth, uint32_t inputViewportHeight,
    uint32_t inputTextureWidth, uint32_t inputTextureHeight,
    uint32_t outputViewportOriginX, uint32_t outputViewportOriginY,
    uint32_t outputViewportWidth, uint32_t outputViewportHeight,
    uint32_t outputTextureWidth, uint32_t outputTextureHeight);

class BilinearUpscale {
public:
    const uint32_t kBlockWidth = 16;
    const uint32_t kBlockHeight = 16;

    BilinearUpscale(DeviceResources& deviceResources);

    void update(uint32_t inputWidth, uint32_t inputHeight, uint32_t outputWidth, uint32_t outputHeight);

    void dispatch(ID3D11ShaderResourceView*const* input, ID3D11UnorderedAccessView*const* output);
private:
    DeviceResources&            m_deviceResources;
    BilinearUpscaleConfig               m_config;
    ComPtr<ID3D11ComputeShader> m_computeShader;
    ComPtr<ID3D11Buffer>        m_csBuffer;
    ComPtr<ID3D11SamplerState>	m_LinearClampSampler;

    uint32_t m_outputWidth;
    uint32_t m_outputHeight;
};