code: func TexSubImage1D(target uint32, level int32, xoffset int32, width int32, format uint32, xtype uint32, pixels unsafe.Pointer) {
  	syscall.Syscall9(gpTexSubImage1D, 7, uintptr(target), uintptr(level), uintptr(xoffset), uintptr(width), uintptr(format), uintptr(xtype), uintptr(pixels), 0, 0)
  }
docs: // specify a one-dimensional texture subimage