pub type clGetDeviceIDsFromDX9INTEL_fn = Option<unsafe extern "C" fn(platform: cl_platform_id, dx9_device_source: cl_dx9_device_source_intel, dx9_object: *mut c_void, dx9_device_set: cl_dx9_device_set_intel, num_entries: cl_uint, devices: *mut cl_device_id, num_devices: *mut cl_uint) -> cl_int>;