/*
	QGLView
	Ivan Pelipenko peri4ko@yandex.ru

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Lesser 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 Lesser General Public License for more details.

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

#ifndef GLBUFFER_H
#define GLBUFFER_H

#include "gltypes.h"


class Buffer
{
	friend class ObjectBase;
public:
	Buffer(GLenum target, GLenum usage = GL_DYNAMIC_DRAW);
	~Buffer();

	void init    (QOpenGLExtraFunctions * f);
	void destroy (QOpenGLExtraFunctions * f);

	void bind    (QOpenGLExtraFunctions * f);
	void release (QOpenGLExtraFunctions * f);
	void * map   (QOpenGLExtraFunctions * f, GLbitfield mode, int size = -1);
	void unmap   (QOpenGLExtraFunctions * f);

	// returns true if size changed
	bool resize  (QOpenGLExtraFunctions * f, int new_size);
	void load    (QOpenGLExtraFunctions * f, const void * data, int size, int offset = 0);

	GLuint ID() const {return buffer_;}
	GLenum usage() const {return usage_;}
	GLenum target() const {return target_;}
	void setTarget(GLenum t) {target_ = t;}
	bool isInit() const {return buffer_ != 0;}

private:
	GLenum target_, usage_;
	GLuint buffer_;
	int prev_size;

};


#endif // GLBUFFER_H