#ifndef __GEOMETRY_H
#define __GEOMETRY_H

#include "common.h"
#include "AxisAlignedBox3.h"
#include "Triangle3.h"


namespace CHCDemoEngine 
{

class RenderState;


/** Represents drawable geometry consisting of triangles.
*/
class Geometry
{
	friend class ResourceManager;

public:
	/** Constructs a geometry from the given data. The vertices are 
		interpreted as triangles. If delData is true, the 
		vertex / normal / texture is deleted when after it was 
		transferred into a vbo
	*/
	Geometry(Vector3 *vertices, 
		     Vector3 *normals, 
			 Texcoord2 *texcoords, 
			 int numVertices, 
			 bool deleteData,
			 Vector3 *tangents);
	/** Detructor destroying the opengl resources.
	*/
	~Geometry();
	/** Render the geometry
	*/
	void Render(RenderState *state);
	/** Return bounding box.
	*/
	const AxisAlignedBox3& GetBoundingBox() const;
	/** Returns the number of triangles in this geometry.
	*/
	inline int GetNumTriangles() const { return mNumVertices / 3; }
	/** Returns true if this geometry has a texture
	*/
	inline bool HasTexture() const { return mHasTexture; }
	

	//////////////
	//-- these functions return the specified data
	//-- only if deleteData has not been switched on in the consruction

	Vector3 *GetVertices(int &numVertices) const;

	Vector3 *GetNormals(int &numNormals) const;

	Vector3 *GetTangents(int &numTangents) const;

	Texcoord2 *GetTexCoords(int &numTexCoords) const;


protected:

	/** Calculates the bounding box from the vertices.
	*/
	void CalcBoundingBox();
	/** Prepare vbos for rendering
	*/
	void Prepare();


	//////////

	Vector3 *mVertices;

	Vector3 *mNormals;

	Vector3 *mTangents;

	Texcoord2 *mTexCoords;

	unsigned int mVboId;

	int mNumVertices;

	AxisAlignedBox3 mBoundingBox;

	bool mHasTexture;

	bool mHasTangents;
};


}

#endif // GEOMETRY_H