func Ortho(left float64, right float64, bottom float64, top float64, zNear float64, zFar float64) {
	C.glowOrtho(gpOrtho, (C.GLdouble)(left), (C.GLdouble)(right), (C.GLdouble)(bottom), (C.GLdouble)(top), (C.GLdouble)(zNear), (C.GLdouble)(zFar))
}
func Ortho(left float64, right float64, bottom float64, top float64, zNear float64, zFar float64) {
	C.glowOrtho(gpOrtho, (C.GLdouble)(left), (C.GLdouble)(right), (C.GLdouble)(bottom), (C.GLdouble)(top), (C.GLdouble)(zNear), (C.GLdouble)(zFar))
}
// multiply the current matrix with an orthographic matrix