internal/graphicsdriver/opengl/gl/package_notwindows.go
func EdgeFlag(flag bool) {
	C.glowEdgeFlag(gpEdgeFlag, (C.GLboolean)(boolToInt(flag)))
}
func EdgeFlag(flag bool) {
	C.glowEdgeFlag(gpEdgeFlag, (C.GLboolean)(boolToInt(flag)))
}
// flag edges as either boundary or nonboundary