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#ifndef QGLRENDERER_H
#define QGLRENDERER_H

#include <QObject>
#include <QMap>
#include "glheaders.h"
#include "qglcamera.h"

class QGLObject;

class QGLRenderer : public QObject
{
	Q_OBJECT
public:
    QGLRenderer();
	void RegisterObject(QGLObject *obj);
	void UnregisterObject(QGLObject *obj);
	void Render();
	bool HasObjects();

	static QGLCamera *camera;
public slots:
	void ToRender(QGLObject *obj);
private:
	QMap<QGLObject*,bool> objects;
};

#endif // QGLRENDERER_H

#include "qglrenderer.h"
#include "qglobject.h"
#include <QList>

QGLCamera* QGLRenderer::camera;

QGLRenderer::QGLRenderer()
{
	objects.clear();
}

void QGLRenderer::RegisterObject(QGLObject *obj)
{
	if ( objects.contains(obj) ) return;
	objects.insert(obj,false);
	connect(obj,SIGNAL(ToRender(QGLObject*)),this,SLOT(ToRender(QGLObject*)));
}

void QGLRenderer::UnregisterObject(QGLObject *obj)
{
	if ( objects.contains(obj) ) {
		objects.remove(obj);
		disconnect(obj,SIGNAL(ToRender(QGLObject*)),this,SLOT(ToRender(QGLObject*)));
	}
}

void QGLRenderer::ToRender(QGLObject *obj)
{
	RegisterObject(obj);
	objects[obj] = true;
}

void QGLRenderer::Render()
{
	QGLObject *obj;
	QMap<GLfloat,QGLObject* > map;
	QList<QGLObject* > r_map;
	QMap<QGLObject*,bool>::const_iterator i = objects.constBegin();
	while ( i != objects.constEnd() ) {
		if ( i.value() == true ) {
			obj = i.key();
			map.insertMulti(obj->DistanceTo(),obj);
		}
		i++;
	}
	QMap<GLfloat,QGLObject* >::const_iterator j = map.constBegin();
	while ( j != map.constEnd() ) {
		obj = j.value();
		r_map.append(obj);
		j++;
		objects[obj] = false;
	}
	for ( int k=r_map.size()-1;k>=0;k-- ) {
		r_map.at(k)->Render();
	}
}

bool QGLRenderer::HasObjects()
{
	if ( objects.isEmpty() ) return false;
	return true;
}

void QGLMesh::Draw()
{
	glNormalPointer(GL_FLOAT,0,normales);
	glVertexPointer(3,GL_FLOAT,0,vertexes);
	glDrawArrays(GL_TRIANGLES,0,numVertex);
}

typedef QPair<QGLObject*, bool> RegistRecord;
QVector<RegistRecord> objects;

for(int i = objects.size() - 1; i >= 0; i--)
{
	objects[i].first->Render();
	objects[i].second = false;
}

QGLRenderer::QGLRenderer()
{
	objects.clear();
}