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almost there, not sure where this last static is coming from though

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This commit is contained in:
Bill Currie 2000-10-13 17:36:42 +00:00
parent 63895493c3
commit f012888213
1 changed files with 64 additions and 56 deletions
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120
source/snd_mix.c
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@ -393,17 +393,11 @@ void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int count)
void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int count)
{
int leftvol, rightvol;
signed short *sfx;
int i = 0;
unsigned int left_phase, right_phase; // never allowed < 0 anyway
int oldphase = ch->oldphase * 2;
int phase = ch->phase * 2;
int leftvol, rightvol;
signed short *sfx;
unsigned int i = 0;
unsigned int left_phase, right_phase; // never allowed < 0 anyway
int dir = (phase - oldphase) > 0 ? 1 : -1;
int ldir;
int rdir;
leftvol = ch->leftvol;
rightvol = ch->rightvol;
@ -413,63 +407,77 @@ void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int count)
sfx = (signed short *)sc->data + ch->pos;
ch->pos += count;
if (oldphase >= 0) {
left_phase = oldphase;
if (ch->phase >= 0) {
left_phase = ch->phase;
right_phase = 0;
} else {
left_phase = 0;
right_phase = -oldphase;
right_phase = -ch->phase;
}
#define PAINT_CHANNELS do { \
int data = sfx[i]; \
int left = (data * leftvol) >> 8; \
int right = (data * rightvol) >> 8; \
paintbuffer[i + left_phase / 2].left += left; \
paintbuffer[i + right_phase / 2].right += right;\
} while (0)
if (ch->oldphase != ch->phase) {
unsigned int olp, orp, nlp, nrp;
unsigned int cl, cr, c;
if (oldphase != phase) {
int c;
if ((oldphase ^ phase) & ~((~0u)>>1)) {
// phase change crosses 0
c = min (count, abs(oldphase));
count -= c;
if (oldphase > 0) {
ldir = -1;
rdir = 0;
} else {
ldir = 0;
rdir = -1;
}
for ( ; c; c--, i++) {
PAINT_CHANNELS;
left_phase += ldir;
right_phase += rdir;
}
oldphase = 0;
}
// oldphase and phase [now] on same size of 0
c = min (count, abs (phase - oldphase));
count -= c;
if (phase > 0) {
ldir = dir;
rdir = 0;
if (ch->oldphase >= 0) {
olp = ch->oldphase;
orp = 0;
} else {
ldir = 0;
rdir = dir;
olp = 0;
orp = -ch->oldphase;
}
for ( ; c; c--, i++) {
PAINT_CHANNELS;
left_phase += ldir;
right_phase += rdir;
nlp = left_phase;
nrp = right_phase;
if (nlp > olp)
cl = 2 * (nlp - olp);
else
cl = olp - nlp;
if (nrp > orp)
cr = 2 * (nrp - orp);
else
cr = orp - nrp;
c = min (count, max (cr, cl));
count -= c;
while (c) {
int data = sfx[i];
int left = (data * leftvol) >> 8;
int right = (data * rightvol) >> 8;
if (nlp < olp) {
if (!(cl & 1)) {
paintbuffer[i + olp].left += left;
olp--;
}
cl--;
} else if (nlp > olp) {
paintbuffer[i + olp].left += left;
olp++;
paintbuffer[i + olp].left += left;
} else {
paintbuffer[i + olp].left += left;
}
if (nrp < orp) {
if (!(cr & 1)) {
paintbuffer[i + orp].right += right;
orp--;
}
cr--;
} else if (nrp > orp) {
paintbuffer[i + orp].right += right;
orp++;
paintbuffer[i + orp].right += right;
} else {
paintbuffer[i + orp].right += right;
}
c--;
i++;
}
}
for (; count ; count--, i++) {
PAINT_CHANNELS;
int data = sfx[i];
int left = (data * leftvol) >> 8;
int right = (data * rightvol) >> 8;
paintbuffer[i + left_phase].left += left;
paintbuffer[i + right_phase].right += right;
}
#undef PAINT_CHANNELS
}