code: func CopyTexImage2D(target uint32, level int32, internalformat uint32, x int32, y int32, width int32, height int32, border int32) {
  	syscall.Syscall9(gpCopyTexImage2D, 8, uintptr(target), uintptr(level), uintptr(internalformat), uintptr(x), uintptr(y), uintptr(width), uintptr(height), uintptr(border), 0)
  }
docs: // copy pixels into a 2D texture image