pub type clGetDeviceIDsFromD3D11_fn = extern "system" fn(platform: cl_platform_id, d3d_device_source: cl_d3d11_device_source, d3d_object: *mut c_void, d3d_device_set: cl_d3d11_device_set, num_entries: cl_uint, devices: *mut cl_device_id, num_devices: *mut cl_uint) -> cl_int;