/*
    QGLView
    Copyright (C) 2012  Ivan Pelipenko peri4ko@gmail.com

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef GLVBO_H
#define GLVBO_H

#include "gltypes.h"

class GLVBO
{
	friend class GLObjectBase;
public:
	GLVBO(GLenum usage = GL_DYNAMIC_DRAW);
	~GLVBO();

	//GLVBO & operator =(const GLVBO & o) {return *this;}

	void init();
	void destroy() {deleteGLBuffer(buffer_);}
	bool rebuffer(bool clear_ = false);
	void draw(GLenum type, bool simplest = false);
	void clear();

	GLuint buffer() const {return buffer_;}
	int verticesCount() const {return vert_count;}
	bool isIinit() const {return buffer_ != 0;}
	bool isEmpty() const {return vert_count == 0;}

	QVector<GLfloat> & vertices() {changed = true; return vertices_;}
	QVector<GLfloat> & normals() {changed = true; return normals_;}
	QVector<GLfloat> & texcoords() {changed = true; return texcoords_;}
	QVector<GLfloat> & colors() {changed = true; return colors_;}

	bool saveToFile(const QString & filename);
	bool loadFromFile(const QString & filename);

private:
	QVector<GLfloat> vertices_, normals_, texcoords_, colors_;
	GLenum usage;
	GLuint buffer_;
	int vert_count;
	bool changed, has_normals, has_texcoords, has_colors;

};

#endif // GLVBO_H