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65 lines
2.0 KiB
Plaintext
From: dan@netlabs.com (Daniel Ketcham)
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Newsgroups: comp.sources.games.bugs
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Subject: Re: jetpack out of memory error with no -DBLIT
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Message-ID: <1992Mar27.010041.13217@netlabs.com>
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Date: 27 Mar 92 01:00:41 GMT
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In article <328@bain3.bain.oz.au>, callum@bain3.bain.oz.au (Callum Gibson) writes:
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> I compiled jetpack (which was just posted) in the default way with the -DBLIT
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> define in tact. However, the response time was several seconds. I thought
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> I'd try it without the -DBLIT to see if it would speed up. It compiled okay
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> but when run it failed immediately with an out of memory error. I knocked
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> up a little program to read the a.out header and discovered that with -DBLIT
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> the bss (uninitialised data segment) was around 344K but without the BLIT
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> it was 52Mb !!!!! It was obvious now why it ran out.
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The problem seems to be in that there is an array of around 10,000 elements
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that has as one of its elements an array of (you guessed it) 10,000! ints.
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I looked at the code a little and came up with the following patch.
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Running with this patch I had no problem.
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Dan Ketcham
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*** erase.c.orig Wed Mar 25 17:19:41 1992
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--- erase.c Thu Mar 26 11:19:35 1992
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***************
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*** 11,16 ****
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--- 11,17 ----
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#ifndef BLIT
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+ #define MAXTOUCH 10
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#define MAXOBJECTS 6+MAXLINES+MAXFIREBALLS+MAXSWEEPERS+MAXFUELPODS+MAXGUARDS+MAXHIGHSCORES/5
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/* Structure for eraseable zones that minimize flicker
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***************
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*** 19,25 ****
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int type, num;
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int x, y, w, h;
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int numtouch;
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! int touch[MAXOBJECTS];
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int erased, drawn;
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};
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--- 20,26 ----
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int type, num;
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int x, y, w, h;
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int numtouch;
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! int touch[MAXTOUCH];
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int erased, drawn;
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};
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***************
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*** 57,62 ****
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--- 58,67 ----
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if(zone_intersect(numzones,j)) {
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zones[j].touch[zones[j].numtouch] = numzones;
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zones[j].numtouch++;
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+ if (zones[j].numtouch == MAXTOUCH) {
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+ zones[j].numtouch = -1;
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+ printf("Reached maxtouch for zone %d\n", numzones);
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+ }
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break;
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}
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}
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