diff options
Diffstat (limited to 'src/doom')
| -rw-r--r-- | src/doom/g_game.c | 75 |
1 files changed, 65 insertions, 10 deletions
diff --git a/src/doom/g_game.c b/src/doom/g_game.c index a36267ca..6ceb1cbb 100644 --- a/src/doom/g_game.c +++ b/src/doom/g_game.c @@ -1093,7 +1093,6 @@ G_CheckSpot fixed_t x; fixed_t y; subsector_t* ss; - unsigned an; mobj_t* mo; int i; @@ -1118,15 +1117,71 @@ G_CheckSpot P_RemoveMobj (bodyque[bodyqueslot%BODYQUESIZE]); bodyque[bodyqueslot%BODYQUESIZE] = players[playernum].mo; bodyqueslot++; - - // spawn a teleport fog - ss = R_PointInSubsector (x,y); - an = ( ANG45 * (((unsigned int) mthing->angle)/45) ) >> ANGLETOFINESHIFT; - - mo = P_SpawnMobj (x+20*finecosine[an], y+20*finesine[an] - , ss->sector->floorheight - , MT_TFOG); - + + // spawn a teleport fog + ss = R_PointInSubsector (x,y); + + + // The code in the released source looks like this: + // + // an = ( ANG45 * (((unsigned int) mthing->angle)/45) ) + // >> ANGLETOFINESHIFT; + // mo = P_SpawnMobj (x+20*finecosine[an], y+20*finesine[an] + // , ss->sector->floorheight + // , MT_TFOG); + // + // But 'an' can be a signed value in the DOS version. This means that + // we get a negative index and the lookups into finecosine/finesine + // end up dereferencing values in finetangent[]. + // A player spawning on a deathmatch start facing directly west spawns + // "silently" with no spawn fog. Emulate this. + // + // This code is imported from PrBoom+. + + { + fixed_t xa, ya; + signed int an; + + an = (ANG45 * ((signed int) mthing->angle / 45)); + // Right-shifting a negative signed integer is implementation-defined, + // so divide instead. + an /= 1 << ANGLETOFINESHIFT; + + switch (an) + { + case -4096: + xa = finetangent[2048]; // finecosine[-4096] + ya = finetangent[0]; // finesine[-4096] + break; + case -3072: + xa = finetangent[3072]; // finecosine[-3072] + ya = finetangent[1024]; // finesine[-3072] + break; + case -2048: + xa = finesine[0]; // finecosine[-2048] + ya = finetangent[2048]; // finesine[-2048] + break; + case -1024: + xa = finesine[1024]; // finecosine[-1024] + ya = finetangent[3072]; // finesine[-1024] + break; + case 0: + case 1024: + case 2048: + case 3072: + case 4096: + xa = finecosine[an]; + ya = finesine[an]; + break; + default: + I_Error("G_CheckSpot: unexpected angle %d\n", an); + xa = ya = 0; + break; + } + mo = P_SpawnMobj(x + 20 * xa, y + 20 * ya, + ss->sector->floorheight, MT_TFOG); + } + if (players[consoleplayer].viewz != 1) S_StartSound (mo, sfx_telept); // don't start sound on first frame |