Function GetTextureData

Shadows/SampleFramework11/Utility.cpp:170–267

Decode a texture into 32-bit floats and copies it to the CPU

// Decode a texture into 32-bit floats and copies it to the CPU
void GetTextureData(ID3D11Device* device, ID3D11ShaderResourceView* textureSRV,
                    std::vector<Float4>& textureData)
{
    static ComputeShaderPtr decodeTextureCS;
    static ComputeShaderPtr decodeTextureArrayCS;

    static const uint32 TGSize = 16;

    if(decodeTextureCS.Valid() == false)
    {
        CompileOptions opts;
        opts.Add("TGSize_", TGSize);
        decodeTextureCS = CompileCSFromFile(device, L"SampleFramework11\\Shaders\\DecodeTextureCS.hlsl",
                                            "DecodeTextureCS", "cs_5_0", opts);

        decodeTextureArrayCS = CompileCSFromFile(device, L"SampleFramework11\\Shaders\\DecodeTextureCS.hlsl",
                                                 "DecodeTextureArrayCS", "cs_5_0", opts);
    }

    ID3D11Texture2DPtr texture;
    textureSRV->GetResource(reinterpret_cast<ID3D11Resource**>(&texture));

    D3D11_TEXTURE2D_DESC texDesc;
    texture->GetDesc(&texDesc);

    D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
    textureSRV->GetDesc(&srvDesc);

    ID3D11ShaderResourceViewPtr sourceSRV = textureSRV;
    uint32 arraySize = texDesc.ArraySize;
    if(srvDesc.ViewDimension == D3D11_SRV_DIMENSION_TEXTURECUBE
       || srvDesc.ViewDimension == D3D11_SRV_DIMENSION_TEXTURECUBEARRAY)
    {
        arraySize *= 6;

        srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2DARRAY;
        srvDesc.Texture2DArray.ArraySize = arraySize;
        srvDesc.Texture2DArray.FirstArraySlice = 0;
        srvDesc.Texture2DArray.MostDetailedMip = 0;
        srvDesc.Texture2DArray.MipLevels = -1;
        DXCall(device->CreateShaderResourceView(texture, &srvDesc, &sourceSRV));
    }

    D3D11_TEXTURE2D_DESC decodeTextureDesc;
    decodeTextureDesc.Width = texDesc.Width;
    decodeTextureDesc.Height = texDesc.Height;
    decodeTextureDesc.ArraySize = arraySize;
    decodeTextureDesc.BindFlags = D3D11_BIND_UNORDERED_ACCESS;
    decodeTextureDesc.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;
    decodeTextureDesc.MipLevels = 1;
    decodeTextureDesc.MiscFlags = 0;
    decodeTextureDesc.SampleDesc.Count = 1;
    decodeTextureDesc.SampleDesc.Quality = 0;
    decodeTextureDesc.Usage = D3D11_USAGE_DEFAULT;
    decodeTextureDesc.CPUAccessFlags = 0;

    ID3D11Texture2DPtr decodeTexture;
    DXCall(device->CreateTexture2D(&decodeTextureDesc, nullptr, &decodeTexture));