code: func CopyTexSubImage1D(target uint32, level int32, xoffset int32, x int32, y int32, width int32) {
  	syscall.Syscall6(gpCopyTexSubImage1D, 6, uintptr(target), uintptr(level), uintptr(xoffset), uintptr(x), uintptr(y), uintptr(width))
  }
docs: // copy a one-dimensional texture subimage