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From: | "Damian Yerrick" <die DOT spammers AT pineight DOT 8m DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Saving random seed, and Allegro |
Date: | Tue, 31 Aug 1999 23:58:31 -0500 |
Organization: | Rose-Hulman Institute of Technology |
Lines: | 64 |
Message-ID: | <7qibto$oqr$1@solomon.cs.rose-hulman.edu> |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Nate Eldredge <neldredge AT hmc DOT edu> wrote in message news:37CC9150 DOT 2BFD0245 AT hmc DOT edu... > Tom Morton wrote: > > > > Hello fellow human beings, > > > > I'm writing a game with allegro and djgpp and it requires a random > > number generator that can have it's seed saved and changed. Until > > now I have been using the rand() and srand() functions but I need > > to be able to store the state of the random number generator. Easy. Use this pseudorandom number function (adapted from the ANSI standard for C rand() ) and two accessors: /**** cut ****/ static int curSeed = 1; /* MyRandom() * Returns a random number from 0 to 32,767. */ int MyRandom(void) { curSeed = (curSeed * 1103515245) + 12345; return (curSeed & 0x7fff0000) >> 16; } /* SetSeed() * Replaces srand(). Sets the seed for MyRandom(). */ void SetSeed(int seed) { curSeed = seed; } /* GetSeed() * Returns the current seed for MyRandom() so it can be saved. */ int GetSeed(void) { return curSeed; } /**** and paste ****/ If you are using Allegro's install_timer(), an initial seed can be obtained by SetSeed(retrace_count); Assuming you have a struct or class with a member randSeed, and you have an instance thereof called myState: To save the seed, myState.randSeed = GetSeed(); To restore the seed, SetSeed(myState.randSeed); > Nate Eldredge > neldredge AT hmc DOT edu Damian Yerrick http://come.to/yerrick
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