/*
   model/vertexarray.h
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#ifndef __INCLUDED_MODEL_VERTEXARRAY_H__
#define __INCLUDED_MODEL_VERTEXARRAY_H__

#include "math/vector3f.h"

namespace model
{

// number of segments in a sphere circle, must be uneven
const int SPHERESEGMENTS = 65;

/// global vertex array
/** a VertexArray acts like a stack of model vertices, it has no knowledge of what it is holding
 */
class VertexArray
{
public:
	/// create a new VertexArray with size in Mb
	VertexArray(size_t size);
	~VertexArray();
	
	void clear();
	
	size_t add_vertex(math::Vector3f const &v, math::Vector3f const &n, float tex_x=0.0f, float tex_y=0.0f);
	
	inline float *vertex()
	{
		return vertex_vertex;
	}

	inline float *normal()
	{
		return vertex_normal;
	}

	inline float *texture()
	{
		return vertex_texture;
	}
	
	inline bool overflow() const
	{
		return vertex_overflow;
	}
	
	/// size of the vertex array in number of floats (for a single array)
	inline size_t size() const
	{
		return vertex_size;
	}
	
	/// number of allocated floats
	inline size_t index() const
	{
		return vertex_index;
	}
	
	static inline VertexArray *instance()
	{
		return vertex_instance;
	}
	
private:
	/// model vertices
	float *vertex_vertex;
	float *vertex_normal;
	float *vertex_texture;
	
	size_t vertex_index;
	size_t vertex_size;
	
	void add_sphere();
	
	static VertexArray *vertex_instance;
	
	bool vertex_overflow;
};

}

#endif // __INCLUDED_MODEL_VERTEXARRAY_H__