Function getSharedDevicePtr

Source/Falcor/Utils/CudaUtils.cpp:197–241

}

void* getSharedDevicePtr(Device::Type deviceType, SharedResourceApiHandle sharedHandle, uint32_t bytes)
{
    // No handle?  No pointer!
    FALCOR_CHECK(sharedHandle, "Texture shared handle creation failed");

    cudaExternalMemoryHandleDesc externalMemoryDesc = {};
    switch (deviceType)
    {
#if FALCOR_WINDOWS
    case Device::Type::D3D12:
        externalMemoryDesc.type = cudaExternalMemoryHandleTypeD3D12Resource;
        externalMemoryDesc.handle.win32.handle = sharedHandle;
        break;
    case Device::Type::Vulkan:
        externalMemoryDesc.type = cudaExternalMemoryHandleTypeOpaqueWin32;
        externalMemoryDesc.handle.win32.handle = sharedHandle;
        break;
#elif FALCOR_LINUX
    case Device::Type::Vulkan:
        externalMemoryDesc.type = cudaExternalMemoryHandleTypeOpaqueFd;
        externalMemoryDesc.handle.fd = (int)reinterpret_cast<intptr_t>(sharedHandle);
        break;
#endif
    default:
        FALCOR_THROW("Unsupported device type '{}'.", deviceType);
    }

    externalMemoryDesc.size = bytes;
    externalMemoryDesc.flags = cudaExternalMemoryDedicated;

    // Get a handle to that memory
    cudaExternalMemory_t externalMemory;
    FALCOR_CUDA_CHECK(cudaImportExternalMemory(&externalMemory, &externalMemoryDesc));

    // Create a descriptor for our shared buffer pointer
    cudaExternalMemoryBufferDesc bufDesc;
    memset(&bufDesc, 0, sizeof(bufDesc));
    bufDesc.size = bytes;

    // Actually map the buffer
    void* devPtr = nullptr;
    FALCOR_CUDA_CHECK(cudaExternalMemoryGetMappedBuffer(&devPtr, externalMemory, &bufDesc));

    return devPtr;
}

bool freeSharedDevicePtr(void* ptr)
{