lineart rendering for openFrameworks

lineart.h

#pragma once
#include "ofMain.h"
void drawModel(ofMesh& mesh) {
	glEnableClientState(GL_VERTEX_ARRAY);
	glVertexPointer(3, GL_FLOAT, sizeof(ofVec3f), &mesh.getVerticesPointer()->x);
	glEnableClientState(GL_NORMAL_ARRAY);
	glNormalPointer(GL_FLOAT, sizeof(ofVec3f), &mesh.getNormalsPointer()->x);
	if(mesh.getNumIndices()){
		glDrawElements(ofGetGLPrimitiveMode(mesh.getMode()), mesh.getNumIndices(), GL_UNSIGNED_INT, mesh.getIndexPointer());
	}else{
		glDrawArrays(ofGetGLPrimitiveMode(mesh.getMode()), 0, mesh.getNumVertices());
	}
	glDisableClientState(GL_NORMAL_ARRAY);
}

void drawLineArt(ofMesh& mesh, float weight = 3, ofColor fill = ofColor(255), ofColor stroke = ofColor(0)) {
	glPushAttrib(GL_ALL_ATTRIB_BITS);
	glEnable(GL_DEPTH_TEST);
	glEnable(GL_CULL_FACE);
	glPolygonMode(GL_FRONT,GL_FILL);
	glDepthFunc(GL_LESS);
	glCullFace(GL_BACK);
	ofSetColor(fill);
	drawModel(mesh);
	glLineWidth(weight); 
	glPolygonMode(GL_BACK,GL_LINE);
	glDepthFunc(GL_LEQUAL);
	glCullFace(GL_FRONT);
	ofSetColor(stroke);
	drawModel(mesh);
	glPopAttrib();
}