func BlendColor(red float32, green float32, blue float32, alpha float32) {
	C.glowBlendColor(gpBlendColor, (C.GLfloat)(red), (C.GLfloat)(green), (C.GLfloat)(blue), (C.GLfloat)(alpha))
}
func BlendColor(red float32, green float32, blue float32, alpha float32) {
	C.glowBlendColor(gpBlendColor, (C.GLfloat)(red), (C.GLfloat)(green), (C.GLfloat)(blue), (C.GLfloat)(alpha))
}
// set the blend color