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/*
   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/color.h"
#include "math/vector3f.h"

namespace model {

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, math::Color const &color, float tex_x=0.0f, float tex_y=0.0f);

	inline float *vertex() { return vertex_vertex; }
	inline float *color() { return vertex_color; }
	inline float *normal() { return vertex_normal; }
	inline float *texture() { return vertex_texture; }

	inline bool overflow() const { return vertex_overflow; }

	/// number of allocated floats
	inline size_t size() const { return vertex_size; }

	/// index to the top of the stack
	inline size_t index() const { return vertex_index; }

	static inline VertexArray *instance() { return vertex_instance; }

private:
	/// model vertices
	float *vertex_vertex;
	float *vertex_color;
	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__