//----------------------------------------------------------------------------
// File: C3DRenderBank.h
// Version: 2.0
// Class: C3DRenderBank
// Type: 3D Bank Manager
// Author: Ken Anderson
// Date: 8/16/04
// Updates:
//    9/13/04 -- The DeallocateSlot member function was fixed as it previously had
//				 been attempting to pass the renderbank callback as the a cbank callback;
//				 however, these are two different structures causing memory leaks & access
//				 violation errors.
//
// Version 2.0 -- System updated to manage the HRBE callback only due to the complexities of
//                the individual handles provided by the special buffer & object.
//
// OS dependant: NA
// Desc: Contains a specialized bank that uses the CBank structure as a private
//		 member variable, to manage and control the bank of void data structures.
//		 The class was designed to act as a protection manager, not allowing
//		 the bank to be destroyed without cleaning up the specialized void
//		 handles that were used.
//
// Notes: NOT DERVIVED FROM CBANK
//		  Error codes can be reviewed in CBank.h
//
// Required headers:
// 1) Common.h -- Contains common structures, definitions, type definitions 
//				  and other features not dependant on any operating
//				  system or system.
// 
//----------------------------------------------------------------------------

//Prevent redefinition
#ifndef __C3DRenderBank__
#define __C3DRenderBank__

#include "Common.h"

#define BKERR_SLOTREMOVALHALTED	(BK_COUNT + 0)	//The slot removal process was halted.

/////////////////////////////
//       DEFINITIONS       //
/////////////////////////////
typedef enum RENDER_BANK_STATES
{
	BSV_NEW,		//Object is new and requires a specialized rendering buffer.
	BSV_UPDATE,		//Object requres a new render buffer and the old one to be destroyed.
	BSV_RENDER,		//Object is safe for rendering.
	BSV_REFRESH,	//Safe to render, but requires updating.
	BSV_DESTROY,	//Object needs to be destroyed.
} C3DRenderBankStates;

/////////////////////////////
//       TYPE DEFS         //
/////////////////////////////
typedef struct RENDER_BANK_ELEMENT
{
	C3DRenderBankStates	rbsState;		//Render bank states.
	void*				pSpecialBuffer;	//Special buffer used by renderer.
	void*				p3DObject;		//Object that called the bank and requested a slot.
	void*				pNext;			//Allows for a secondary RBE link.
} RBE, *PRBE, **HRBE;

class C3DRenderBank
{
//Class member variables
private:
	CBank* m_pbank;

//Class member functions	
public:

	//Constructors & Destructors
	C3DRenderBank();
	~C3DRenderBank();

	BANKERR Create();
	void Destroy();

	//Common 3d object management.
	//The following members should be called by the common 3d object management.
	//Object updating features for common 3d objects to manage.
	BANKERR AllocateSlot(HRBE* tCallback);	//Allocate a slot in the bank.
	BANKERR DeallocateSlot(HRBE* tCallback);	//Tell the bank to clean up current slot.

	BANKERR RetrieveCallback(BST bstIndex, HRBE* tCallback);	//Returns the callback based on the index.
	BST Depth();	//Returns the size of the bank.

	BANKERR UpdateBuffer(HRBE hCallback);	//Inform the bank to update the current slot & rebuild buffer.
	BANKERR RefreshSlot(HRBE hCallback);	//Inform the bank to refresh or update the current slot.

private:
	void Cleanup();							//Clean up the render bank.

};

#endif