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Potentially apply VHS distortion semi-transparently?

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Pros: fuckin SMOOTH effect especially for 256-color sw
Cons: might lose the intended color distortion, maybe
not a great idea for FPS
Conclusion: put it behind an ifdef for now
This commit is contained in:
fickleheart 2019-04-09 01:09:13 -05:00
parent ae473585b7
commit 56c1f05217
1 changed files with 9 additions and 6 deletions
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15
src/v_video.c
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@ -1223,7 +1223,9 @@ void V_DrawVhsEffect(boolean rewind)
UINT32 pos = 0;
UINT8 *normalmapstart = ((UINT8 *)transtables + (8<<FF_TRANSSHIFT|(19<<8)));
//UINT8 *barmapstart = ((UINT8 *)transtables + (6<<FF_TRANSSHIFT|(25<<8)));
#ifdef HQ_VHS
UINT8 *tmapstart = ((UINT8 *)transtables + (6<<FF_TRANSSHIFT));
#endif
UINT8 *thismapstart;
UINT16 randommask;
INT8 offs;
@ -1248,14 +1250,11 @@ void V_DrawVhsEffect(boolean rewind)
if (y >= upbary && y < upbary+barsize)
{
//randommask = 0x0300;
thismapstart -= (2<<FF_TRANSSHIFT) - (5<<8);
offs += updistort * 2.0f * min(y-upbary, upbary+barsize-y) / barsize;
}
if (y >= downbary && y < downbary+barsize)
{
//randommask = 0x0300;
//thismapstart = barmapstart;
thismapstart -= (2<<FF_TRANSSHIFT) - (5<<8);
offs -= downdistort * 2.0f * min(y-downbary, downbary+barsize-y) / barsize;
}
@ -1266,9 +1265,13 @@ void V_DrawVhsEffect(boolean rewind)
else if (y == vid.height-1 && offs > 0) offs = 0;
for (x = 0; x < vid.rowbytes; x++, pos++)
tmp[pos] = thismapstart[/*(M_RandomFixed()&randommask)|*/buf[pos+offs]];
{
tmp[pos] = thismapstart[buf[pos+offs]];
#ifdef HQ_VHS
tmp[pos] = tmapstart[buf[pos]<<8 | tmp[pos]];
#endif
}
}
(void)randommask;
memcpy(buf, tmp, vid.rowbytes*vid.height);
}