//void glRectdv (const float64 *v1, const float64 *v2) func Rectdv(a, b *[2]float64) { C.glRectdv((*C.GLdouble)(&a[0]), (*C.GLdouble)(&b[0])) }
//void glRectdv (const float64 *v1, const float64 *v2) func Rectdv(a, b []float64) { if len(a) != 2 || len(b) != 2 { panic(ErrorInputSize) } C.glRectdv((*C.GLdouble)(&a[0]), (*C.GLdouble)(&b[0])) }