pub type clGetDeviceIDsFromD3D11KHR_fn = Option<unsafe extern "C" fn(platform: cl_platform_id, d3d_device_source: cl_d3d11_device_source_khr, d3d_object: *mut c_void, d3d_device_set: cl_d3d11_device_set_khr, num_entries: cl_uint, devices: *mut cl_device_id, num_devices: *mut cl_uint) -> cl_int>;