code: func CopyTexSubImage2D(target uint32, level int32, xoffset int32, yoffset int32, x int32, y int32, width int32, height int32) {
  	syscall.Syscall9(gpCopyTexSubImage2D, 8, uintptr(target), uintptr(level), uintptr(xoffset), uintptr(yoffset), uintptr(x), uintptr(y), uintptr(width), uintptr(height), 0)
  }
docs: // copy a two-dimensional texture subimage