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OS/2 Shareware BBS: 10 Tools
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SAMPLES
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RANDOM.C
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1997-09-30
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2KB
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55 lines
static char sccsid[] = "@(#)27 1.1 src/gos/3d/opengl/gltest/tkdemos/random.c, gltest, opengl_1.0 8/15/95 20:18:13";
//
// COMPONENT_NAME: GLTEST
//
// FUNCTIONS: Systems
// myrand
// mysrand
//
//
// ORIGINS: 27
//
//
// (C) COPYRIGHT International Business Machines Corp. 1993
// All Rights Reserved
// Licensed Materials - Property of IBM
// US Government Users Restricted Rights - Use, duplication or
// disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
//
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose and without fee is hereby granted, provided
// that the above copyright notice appear in all copies and that both that
// copyright notice and this permission notice appear in supporting
// documentation, and that the name of I.B.M. not be used in advertising
// or publicity pertaining to distribution of the software without specific,
// written prior permission. I.B.M. makes no representations about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
//
// I.B.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL I.B.M.
// BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Author: John Spitzer, IBM AWS Graphics Systems (Austin)
//
// Need predicatable, reproducible numbers over a number of platforms
// Thus, we need an implementation independent psuedo-random number
// generator. Here, we use the Linear Congruential Method.
static seed = 1;
void mysrand(int i)
{
seed = i;
}
int myrand()
{
return seed = (seed*7621 + 1)&0xffff;
}