code: func DrawTransformFeedbackStreamInstanced(mode uint32, id uint32, stream uint32, instancecount int32) {
  	syscall.Syscall6(gpDrawTransformFeedbackStreamInstanced, 4, uintptr(mode), uintptr(id), uintptr(stream), uintptr(instancecount), 0, 0)
  }
docs: // render multiple instances of primitives using a count derived from a specifed stream of a transform feedback object