code: func GetInternalformativ(target uint32, internalformat uint32, pname uint32, bufSize int32, params *int32) {
  	syscall.Syscall6(gpGetInternalformativ, 5, uintptr(target), uintptr(internalformat), uintptr(pname), uintptr(bufSize), uintptr(unsafe.Pointer(params)), 0)
  }
docs: // retrieve information about implementation-dependent support for internal formats