func LineWidth(width float32) {
	syscall.Syscall(gpLineWidth, 1, uintptr(math.Float32bits(width)), 0, 0)
}
func LineWidth(width float32) {
	syscall.Syscall(gpLineWidth, 1, uintptr(math.Float32bits(width)), 0, 0)
}
// specify the width of rasterized lines