Function importTextureToMipmappedArray

Source/Falcor/Utils/CudaUtils.cpp:250–284

}

cudaMipmappedArray_t importTextureToMipmappedArray(ref<Texture> pTex, uint32_t cudaUsageFlags)
{
    SharedResourceApiHandle sharedHandle = pTex->getSharedApiHandle();
    FALCOR_CHECK(sharedHandle, "Texture shared handle creation failed");

    cudaExternalMemoryHandleDesc externalMemoryHandleDesc;
    memset(&externalMemoryHandleDesc, 0, sizeof(externalMemoryHandleDesc));

    externalMemoryHandleDesc.type = cudaExternalMemoryHandleTypeD3D12Resource;
    externalMemoryHandleDesc.handle.win32.handle = sharedHandle;
    externalMemoryHandleDesc.size = pTex->getTextureSizeInBytes();
    externalMemoryHandleDesc.flags = cudaExternalMemoryDedicated;

    cudaExternalMemory_t externalMemory;
    FALCOR_CUDA_CHECK(cudaImportExternalMemory(&externalMemory, &externalMemoryHandleDesc));

    // Map mipmapped array onto external memory
    cudaExternalMemoryMipmappedArrayDesc mipDesc;
    memset(&mipDesc, 0, sizeof(mipDesc));
    auto format = pTex->getFormat();
    mipDesc.formatDesc.x = getNumChannelBits(format, 0);
    mipDesc.formatDesc.y = getNumChannelBits(format, 1);
    mipDesc.formatDesc.z = getNumChannelBits(format, 2);
    mipDesc.formatDesc.w = getNumChannelBits(format, 3);
    mipDesc.formatDesc.f = (getFormatType(format) == FormatType::Float) ? cudaChannelFormatKindFloat : cudaChannelFormatKindUnsigned;
    mipDesc.extent.depth = 1;
    mipDesc.extent.width = pTex->getWidth();
    mipDesc.extent.height = pTex->getHeight();
    mipDesc.flags = cudaUsageFlags;
    mipDesc.numLevels = 1;

    cudaMipmappedArray_t mipmappedArray;
    FALCOR_CUDA_CHECK(cudaExternalMemoryGetMappedMipmappedArray(&mipmappedArray, externalMemory, &mipDesc));
    return mipmappedArray;
}

cudaSurfaceObject_t mapTextureToSurface(ref<Texture> pTex, uint32_t cudaUsageFlags)
{