// gcc -std=c99 -Wall -o tessellation-test tessellation-test.c -lGLU -lGL
#include <GL/glu.h>
#include <stdio.h>
#include <assert.h>
    
void GLAPIENTRY vertex(void *v){
	printf("vertex %p\n", v);
}

int main()
{
	GLdouble coords[3][3] = {{0, 0, 0}, {1, 0, 0}, {1, 1, 0}};

	int whatevs = 0;

	for(int j = 0; j < 2; j++){
		GLUtesselator* tess = gluNewTess();
		assert(tess);

		gluTessCallback(tess, GLU_TESS_VERTEX, (void(*)())&vertex);

		gluTessBeginPolygon(tess, NULL);
		gluTessBeginContour(tess);

		for(int i = 0; i < sizeof(coords) / ((sizeof(GLdouble) * 3)); i++)
			gluTessVertex(tess, coords[i], j == 0 ? &whatevs : NULL);

		gluTessEndContour(tess);
		gluTessEndPolygon(tess);

		gluDeleteTess(tess);
	}

	return 0;
}