predlod.h

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  This program is free software: you can redistribute it and/or modify
**  it under the terms of the GNU 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 General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
 
/*************************************************************************** 
 ***    C O N F I D E N T I A L  ---  W E S T W O O D  S T U D I O S     *** 
 *************************************************************************** 
 *                                                                         * 
 *                 Project Name : G                                        * 
 *                                                                         * 
 *                     $Archive:: /Commando/Code/ww3d2/predlod.h          $* 
 *                                                                         * 
 *                      $Author:: Jani_p                                  $* 
 *                                                                         * 
 *                     $Modtime:: 9/20/01 10:10a                          $* 
 *                                                                         * 
 *                    $Revision:: 3                                       $* 
 *                                                                         * 
 *-------------------------------------------------------------------------* 
 * Functions:                                                              * 
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
#if defined(_MSC_VER)
#pragma once
#endif
 
#ifndef PREDLOD_H
#define PREDLOD_H
 
// This file contains the classes which support predictive LOD management
// similar to that outlined in "Adaptive Display Algorithm for Interactive
// Frame Rates During Visualization of Complex Virtual Environments",
// Thomas Funkhouser & Carlo Sequin, SIGGRAPH '93 Proceedings, pp. 247-253.
// To this "pure predictive" LOD we have added distance (actually screensize)
// clamping to control quality degradation.
 
#include "rendobj.h"
#include "float.h"
#include "vector.h"
 
class LODHeapNode;
 
/*
** PredictiveLODOptimizerClass: Class which performs the predictive LOD
** optimization. All the members of this class are static.
*/
class PredictiveLODOptimizerClass {
 
    public:
 
        static void     Clear(void);
        static void     Add_Object(RenderObjClass *robj);
        static void     Add_Cost(float cost)                                { TotalCost += cost; }
        static void     Optimize_LODs(float max_cost);
        static float    Get_Total_Cost(void)                              { return TotalCost; }
        static void     Free(void); // frees all memory
 
    private:
        static void     AllocVisibleObjArrays(int num_objects);
 
        static RenderObjClass **  ObjectArray;
        static int                      ArraySize;
        static int                      NumObjects;
        static float                    TotalCost;
 
        static LODHeapNode *VisibleObjArray1;
        static LODHeapNode *VisibleObjArray2;
        static int VisibleObjArraySize;
 
};
 
#endif