avg.h

game duke3d source

//-------------------------------------------------------------------------
/*
Copyright (C) 1996, 2003 - 3D Realms Entertainment

This file is NOT part of Duke Nukem 3D version 1.5 - Atomic Edition
However, it is either an older version of a file that is, or is
some test code written during the development of Duke Nukem 3D.
This file is provided purely for educational interest.

Duke Nukem 3D 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 2
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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

Prepared for public release: 03/21/2003 - Charlie Wiederhold, 3D Realms
*/
//-------------------------------------------------------------------------

#ifndef __avg_public__
#define __avg_public__
#ifdef __cplusplus
extern "C" {
#endif

typedef struct
   {
   int32 * values;
   int32 index;
   int32 sum;
   int32 average;
   int32 shift;
   int32 base;
   } avg_t;

// numvalues = number of items to average
// each element is set to initvalue
avg_t * AVG_Init( int32 numvalues, int32 initvalue );
void        AVG_Free( avg_t * avg );
// value is the new value entered into the table
// returns the current average after inserting the new value
int32       AVG_Value( avg_t * avg, int32 value );
// returns the current average
int32       AVG_Average( avg_t * avg );
// returns the current average in floating point (much more precise)
float32     AVG_FloatAverage( avg_t * avg );

#ifdef __cplusplus
};
#endif
#endif