#include <iostream>
using namespace std;

#include "vgl.h"

void DebugCallbackFunction(unsigned int source,
               unsigned int type, unsigned int id, unsigned int severity,
               int length, const GLchar* message, const void * userParam);

void InitErrors(){
    if(glDebugMessageCallback){
        glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
        glEnable(GL_DEBUG_OUTPUT);
        glDebugMessageCallback(DebugCallbackFunction, NULL);
        GLuint unusedIds = 0;
        glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE,
            0, &unusedIds, true);
    } else {
        cout << "glDebugMessageCallback not available" << endl;
    }
    return;
}

void DebugCallbackFunction(unsigned int source,
               unsigned int type, unsigned int id, unsigned int severity,
               int length, const GLchar* message, const void * userParam){

    cerr << "An OpenGL error has occured " << endl;
	cerr << "\tmessage: "<< message << endl;
	cerr << "\ttype: ";
	switch (type) {
	case GL_DEBUG_TYPE_ERROR:
		cerr << "ERROR";
		break;
	case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR:
		cerr << "DEPRECATED_BEHAVIOR";
		break;
	case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:
		cerr << "UNDEFINED_BEHAVIOR";
		break;
	case GL_DEBUG_TYPE_PORTABILITY:
		cerr << "PORTABILITY";
		break;
	case GL_DEBUG_TYPE_PERFORMANCE:
		cerr << "PERFORMANCE";
		break;
	case GL_DEBUG_TYPE_OTHER:
		cerr << "OTHER";
		break;
	}
	cerr << endl;

	cerr << "\tid: "<<id << endl;
	cerr << "\tseverity: ";
	switch (severity){
	case GL_DEBUG_SEVERITY_LOW:
		cerr << "LOW";
		break;
	case GL_DEBUG_SEVERITY_MEDIUM:
		cerr << "MEDIUM";
		break;
	case GL_DEBUG_SEVERITY_HIGH:
		cerr << "HIGH";
		break;
	}
	cerr << endl << endl;
	return;
}