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Comment and format the engine's sprite list management functions; one tweak.

Browse source 
In changesprite{stat,sect}, don't check for deletesprite{stat,sect} failure,
because the only way it can fail was already checked for above.  So, this is
essentially dead code elimination.

git-svn-id: https://svn.eduke32.com/eduke32@2462 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
helixhorned 2012-03-13 20:04:56 +00:00
parent d5a24b38de
commit 42f5a7d9c9
1 changed files with 45 additions and 13 deletions
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58
polymer/eduke32/build/src/engine.c
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@ -7512,12 +7512,15 @@ int32_t insertspritesect(int16_t sectnum)
if ((sectnum >= MAXSECTORS) || (headspritesect[MAXSECTORS] == -1))
return(-1); //list full
// remove one sprite from the sectnum-freelist
blanktouse = headspritesect[MAXSECTORS];
headspritesect[MAXSECTORS] = nextspritesect[blanktouse];
// make 'previous' link of the new freelist head point to nil
if (headspritesect[MAXSECTORS] >= 0)
prevspritesect[headspritesect[MAXSECTORS]] = -1;
// insert the fetched sprite at the head of the sectnum list
prevspritesect[blanktouse] = -1;
nextspritesect[blanktouse] = headspritesect[sectnum];
if (headspritesect[sectnum] >= 0)
@ -7535,17 +7538,20 @@ int32_t insertspritesect(int16_t sectnum)
//
int32_t insertspritestat(int16_t statnum)
{
int16_t blanktouse;
int16_t blanktouse; // a spritenum with no assigned statnum
if ((statnum >= MAXSTATUS) || (headspritestat[MAXSTATUS] == -1))
return(-1); //list full
// remove one sprite from the statnum-freelist
blanktouse = headspritestat[MAXSTATUS];
headspritestat[MAXSTATUS] = nextspritestat[blanktouse];
// make 'previous' link of the new freelist head point to nil
if (headspritestat[MAXSTATUS] >= 0)
prevspritestat[headspritestat[MAXSTATUS]] = -1;
// insert the fetched sprite at the head of the statnum list
prevspritestat[blanktouse] = -1;
nextspritestat[blanktouse] = headspritestat[statnum];
if (headspritestat[statnum] >= 0)
@ -7563,8 +7569,9 @@ int32_t insertspritestat(int16_t statnum)
//
int32_t deletespritesect(int16_t deleteme)
{
// only non-redundant from deletesprite():
if (sprite[deleteme].sectnum == MAXSECTORS)
return(-1);
return(-1); // already not in the world
if (headspritesect[sprite[deleteme].sectnum] == deleteme)
headspritesect[sprite[deleteme].sectnum] = nextspritesect[deleteme];
@ -7572,12 +7579,14 @@ int32_t deletespritesect(int16_t deleteme)
if (prevspritesect[deleteme] >= 0) nextspritesect[prevspritesect[deleteme]] = nextspritesect[deleteme];
if (nextspritesect[deleteme] >= 0) prevspritesect[nextspritesect[deleteme]] = prevspritesect[deleteme];
// put the deleted sprite at the head of the sectnum-freelist
if (headspritesect[MAXSECTORS] >= 0) prevspritesect[headspritesect[MAXSECTORS]] = deleteme;
prevspritesect[deleteme] = -1;
nextspritesect[deleteme] = headspritesect[MAXSECTORS];
headspritesect[MAXSECTORS] = deleteme;
sprite[deleteme].sectnum = MAXSECTORS;
return(0);
}
@ -7587,8 +7596,9 @@ int32_t deletespritesect(int16_t deleteme)
//
int32_t deletespritestat(int16_t deleteme)
{
// only non-redundant from deletesprite():
if (sprite[deleteme].statnum == MAXSTATUS)
return(-1);
return(-1); // already not in the world
if (headspritestat[sprite[deleteme].statnum] == deleteme)
headspritestat[sprite[deleteme].statnum] = nextspritestat[deleteme];
@ -7596,12 +7606,14 @@ int32_t deletespritestat(int16_t deleteme)
if (prevspritestat[deleteme] >= 0) nextspritestat[prevspritestat[deleteme]] = nextspritestat[deleteme];
if (nextspritestat[deleteme] >= 0) prevspritestat[nextspritestat[deleteme]] = prevspritestat[deleteme];
// put the deleted sprite at the head of the statnum-freelist
if (headspritestat[MAXSTATUS] >= 0) prevspritestat[headspritestat[MAXSTATUS]] = deleteme;
prevspritestat[deleteme] = -1;
nextspritestat[deleteme] = headspritestat[MAXSTATUS];
headspritestat[MAXSTATUS] = deleteme;
sprite[deleteme].statnum = MAXSTATUS;
return(0);
}
@ -8027,6 +8039,16 @@ void initspritelists(void)
{
int32_t i;
// initial list state for sector lists (analogous for statnum lists):
//
// sector 0: nil
// sector 1: nil
// . . .
// sector MAXSECTORS-1: nil
// "sector MAXSECTORS": nil <- 0 <-> 1 <-> 2 <-> ... <-> MAXSPRITES-1 -> nil
//
// That is, the dummy MAXSECTORS sector has all sprites.
for (i=0; i<MAXSECTORS; i++) //Init doubly-linked sprite sector lists
headspritesect[i] = -1;
headspritesect[MAXSECTORS] = 0;
@ -10750,11 +10772,16 @@ int32_t setspritez(int16_t spritenum, const vec3_t *new)
//
int32_t changespritesect(int16_t spritenum, int16_t newsectnum)
{
if ((newsectnum < 0) || (newsectnum > MAXSECTORS)) return(-1);
if (sprite[spritenum].sectnum == newsectnum) return(0);
if (sprite[spritenum].sectnum == MAXSECTORS) return(-1);
if (deletespritesect(spritenum) < 0) return(-1);
if ((newsectnum < 0) || (newsectnum > MAXSECTORS))
return(-1);
if (sprite[spritenum].sectnum == newsectnum)
return(0);
if (sprite[spritenum].sectnum == MAXSECTORS)
return(-1);
deletespritesect(spritenum);
insertspritesect(newsectnum);
return(0);
}
@ -10764,11 +10791,16 @@ int32_t changespritesect(int16_t spritenum, int16_t newsectnum)
//
int32_t changespritestat(int16_t spritenum, int16_t newstatnum)
{
if ((newstatnum < 0) || (newstatnum > MAXSTATUS)) return(-1);
if (sprite[spritenum].statnum == newstatnum) return(0);
if (sprite[spritenum].statnum == MAXSTATUS) return(-1);
if (deletespritestat(spritenum) < 0) return(-1);
if ((newstatnum < 0) || (newstatnum > MAXSTATUS))
return(-1);
if (sprite[spritenum].statnum == newstatnum)
return(0); // sprite already has desired statnum
if (sprite[spritenum].statnum == MAXSTATUS)
return(-1); // can't set the statnum of a sprite not in the world
deletespritestat(spritenum);
insertspritestat(newstatnum);
return(0);
}