/*
	QGL VertexObject
	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 GLVERTEXOBJECT_H
#define GLVERTEXOBJECT_H

#include "glbuffer.h"
#include "glshaders_types.h"


class VertexObject
{
	friend class Mesh;
public:
	VertexObject();
	~VertexObject();

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

	void bind    (QOpenGLExtraFunctions * f);
	void release (QOpenGLExtraFunctions * f);

	void bindBuffers   (QOpenGLExtraFunctions * f, Buffer & geom, Buffer & elem, bool force = false);
	void loadObject    (QOpenGLExtraFunctions * f, const QGLEngineShaders::Object & object);
	void loadObjects   (QOpenGLExtraFunctions * f, const QVector<QGLEngineShaders::Object> & objects);
	void loadSelections(QOpenGLExtraFunctions * f, const QVector<uchar> & sels);

	void draw(QOpenGLExtraFunctions * f, GLenum geom_type, int vert_cout, int obj_count);

	GLuint ID() const {return vao_;}
	bool isInit() const {return vao_ != 0;}

	bool isObjectsChanged() const {return objects_changed;}
	bool isSelectionChanged() const {return selected_changed;}
	void setObjectsChanged(bool yes = true) {objects_changed = yes;}
	void setSelectionChanged(bool yes = true) {selected_changed = yes;}

private:
	void loadBuffer(QOpenGLExtraFunctions * f, Buffer & buf, const void * data, int size);

	GLuint vao_;
	Buffer buffer_obj, buffer_sel;
	bool buffers_binded, objects_changed, selected_changed;

};


#endif // GLVERTEXOBJECT_H