goom_tools.h 1.58 KB
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/* Goom Project
 * Copyright (C) <2003> iOS-Software
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
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 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
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 */
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#ifndef _GOOMTOOLS_H
#define _GOOMTOOLS_H

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#include "goom_config.h"

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/**
 * Random number generator wrapper for faster random number.
 */

#define GOOM_NB_RAND 0x10000

typedef struct _GOOM_RANDOM {
	int array[GOOM_NB_RAND];
	unsigned short pos;
} GoomRandom;

GoomRandom *goom_random_init(int i);
void goom_random_free(GoomRandom *grandom);

inline static int goom_random(GoomRandom *grandom) {
	
	grandom->pos++; /* works because pos is an unsigned short */
	return grandom->array[grandom->pos];
}

inline static int goom_irand(GoomRandom *grandom, int i) {

	grandom->pos++;
	return grandom->array[grandom->pos] % i;
}

/* called to change the specified number of value in the array, so that the array does not remain the same*/
void goom_random_update_array(GoomRandom *grandom, int numberOfValuesToChange);

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#endif