Function SaveStagingTextureAsDDS

src/engine/DDSFile.cpp:805–929

    }

    std::shared_ptr<IBlob> SaveStagingTextureAsDDS(nvrhi::IDevice* device, nvrhi::IStagingTexture* stagingTexture)
    {
        DDS_HEADER header = {};
        DDS_HEADER_DXT10 dx10header = {};
        const nvrhi::TextureDesc& textureDesc = stagingTexture->getDesc();

        header.size = sizeof(DDS_HEADER);
        header.flags = DDS_HEADER_FLAGS_TEXTURE;
        header.width = textureDesc.width;
        header.height = textureDesc.height;
        header.depth = textureDesc.depth;
        header.mipMapCount = textureDesc.mipLevels;
        header.ddspf.size = sizeof(DDS_PIXELFORMAT);
        header.ddspf.flags = DDS_FOURCC;
        header.ddspf.fourCC = MAKEFOURCC('D', 'X', '1', '0');

        switch (textureDesc.dimension)
        {
        case nvrhi::TextureDimension::Texture1D:
        case nvrhi::TextureDimension::Texture1DArray:
            dx10header.resourceDimension = DDS_DIMENSION_TEXTURE1D;
            break;

        case nvrhi::TextureDimension::Texture2D:
        case nvrhi::TextureDimension::Texture2DArray:
        case nvrhi::TextureDimension::TextureCube:
        case nvrhi::TextureDimension::TextureCubeArray:
            dx10header.resourceDimension = DDS_DIMENSION_TEXTURE2D;
            break;

        case nvrhi::TextureDimension::Texture3D:
            // Unsupported
            return nullptr;
            /*header.flags |= DDS_HEADER_FLAGS_VOLUME;
            dx10header.resourceDimension = DDS_DIMENSION_TEXTURE3D;
            break;*/

        case nvrhi::TextureDimension::Texture2DMS:
        case nvrhi::TextureDimension::Texture2DMSArray:
        case nvrhi::TextureDimension::Unknown:
            // Unsupported
            return nullptr;
        }

        dx10header.arraySize = textureDesc.arraySize;
        if (textureDesc.dimension == nvrhi::TextureDimension::TextureCube || textureDesc.dimension == nvrhi::TextureDimension::TextureCubeArray)
        {
            dx10header.arraySize /= 6;
            dx10header.miscFlag |= D3D11_RESOURCE_MISC_TEXTURECUBE;
        }

        for (const FormatMapping& mapping : g_FormatMappings)
        {
            if (mapping.nvrhiFormat == textureDesc.format)
            {
                dx10header.dxgiFormat = mapping.dxgiFormat;
                break;
            }