mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-12-11 13:21:10 +00:00
79f3f651a4
Nuclear powered audio ;) More seriously, use _Atomic on a few fields that very obviously need it. That is, channel's buffer pointer (used to signal to the mixer that the channel is ready for use) and "flow control" flags (stop, done and pause), and head and tail in the buffer itself. Since QF has been working without _Atomic (admittedly, thanks to luck and x86's strong memory model), this should do until proven otherwise. I imagine getting stream reading out of the RT thread will highlight any issues.
473 lines
11 KiB
C
473 lines
11 KiB
C
/*
|
|
snd_mix.c
|
|
|
|
portable code to mix sounds for snd_dma.c
|
|
|
|
Copyright (C) 1996-1997 Id Software, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License
|
|
as published by the Free Software Foundation; either version 2
|
|
of the License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
|
|
See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to:
|
|
|
|
Free Software Foundation, Inc.
|
|
59 Temple Place - Suite 330
|
|
Boston, MA 02111-1307, USA
|
|
|
|
*/
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#ifdef HAVE_STRING_H
|
|
# include <string.h>
|
|
#endif
|
|
#ifdef HAVE_STRINGS_H
|
|
# include <strings.h>
|
|
#endif
|
|
|
|
#include "winquake.h"
|
|
|
|
#include "QF/cvar.h"
|
|
#include "QF/sound.h"
|
|
#include "QF/sys.h"
|
|
|
|
#include "compat.h"
|
|
#include "snd_internal.h"
|
|
|
|
#define VOLSCALE 0.5 // so mixing is less likely to overflow
|
|
|
|
portable_samplepair_t snd_paintbuffer[PAINTBUFFER_SIZE * 2];
|
|
static int max_overpaint; // number of extra samples painted
|
|
// due to phase shift
|
|
|
|
/* CHANNEL MIXING */
|
|
|
|
static inline int
|
|
check_channel_end (channel_t *ch, sfxbuffer_t *sb, int count, unsigned ltime)
|
|
{
|
|
if (count <= 0 || ltime >= ch->end) {
|
|
if (ch->loopstart != (unsigned) -1) {
|
|
ch->pos = ch->loopstart;
|
|
ch->end = ltime + sb->sfx_length - ch->pos;
|
|
} else { // channel just stopped
|
|
ch->done = 1;
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
snd_paint_channel (channel_t *ch, sfxbuffer_t *sb, int count)
|
|
{
|
|
unsigned pos;
|
|
int offs = 0;
|
|
float *samps;
|
|
|
|
if ((int) ch->pos < 0) {
|
|
ch->pos += count;
|
|
if ((int) ch->pos <= 0)
|
|
return;
|
|
offs = count - ch->pos;
|
|
count -= offs;
|
|
ch->pos = 0;
|
|
}
|
|
if (ch->pos < sb->pos || ch->pos - sb->pos >= sb->size)
|
|
sb->setpos (sb, ch->pos);
|
|
pos = (ch->pos - sb->pos + sb->tail) % sb->size;
|
|
samps = sb->data + pos * sb->channels;
|
|
|
|
if (pos + count > sb->size) {
|
|
unsigned sub = sb->size - pos;
|
|
sb->paint (offs, ch, samps, sub);
|
|
sb->paint (offs + sub, ch, sb->data, count - sub);
|
|
} else {
|
|
sb->paint (offs, ch, samps, count);
|
|
}
|
|
ch->pos += count;
|
|
}
|
|
|
|
void
|
|
SND_PaintChannels (snd_t *snd, unsigned endtime)
|
|
{
|
|
unsigned end, ltime;
|
|
int i, count;
|
|
channel_t *ch;
|
|
sfxbuffer_t *sb;
|
|
|
|
// clear the paint buffer
|
|
for (i = 0; i < PAINTBUFFER_SIZE * 2; i++) {
|
|
snd_paintbuffer[i].left = 0;
|
|
snd_paintbuffer[i].right = 0;
|
|
}
|
|
|
|
while (snd->paintedtime < endtime) {
|
|
// if snd_paintbuffer is smaller than DMA buffer
|
|
end = endtime;
|
|
if (end - snd->paintedtime > PAINTBUFFER_SIZE)
|
|
end = snd->paintedtime + PAINTBUFFER_SIZE;
|
|
|
|
max_overpaint = 0;
|
|
|
|
// paint in the channels.
|
|
ch = snd_channels;
|
|
for (i = 0; i < snd_total_channels; i++, ch++) {
|
|
if (!(sb = ch->buffer) || ch->done) {
|
|
// channel is inactive
|
|
continue;
|
|
}
|
|
if (ch->stop) {
|
|
ch->done = 1; // acknowledge stopped signal
|
|
continue;
|
|
}
|
|
if (ch->pause)
|
|
continue;
|
|
|
|
if (!ch->end)
|
|
ch->end = snd->paintedtime + sb->sfx_length - ch->pos;
|
|
|
|
ltime = snd->paintedtime;
|
|
|
|
while (ltime < end) { // paint up to end
|
|
count = ((ch->end < end) ? ch->end : end) - ltime;
|
|
if (count > 0) {
|
|
if (ch->leftvol || ch->rightvol) {
|
|
snd_paint_channel (ch, sb, count);
|
|
if (sb->advance) {
|
|
if (!sb->advance (sb, count)) {
|
|
// this channel can no longer be used as its
|
|
// source has died.
|
|
ch->done = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ltime += count;
|
|
}
|
|
|
|
if (check_channel_end (ch, sb, count, ltime))
|
|
break;
|
|
}
|
|
}
|
|
|
|
// transfer out according to DMA format
|
|
snd->xfer (snd, snd_paintbuffer, end - snd->paintedtime,
|
|
snd_volume);
|
|
|
|
memmove (snd_paintbuffer, snd_paintbuffer + end - snd->paintedtime,
|
|
max_overpaint * sizeof (snd_paintbuffer[0]));
|
|
memset (snd_paintbuffer + max_overpaint, 0, sizeof (snd_paintbuffer)
|
|
- max_overpaint * sizeof (snd_paintbuffer[0]));
|
|
|
|
snd->paintedtime = end;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
snd_mix_single (portable_samplepair_t *pair, float **samp,
|
|
float lvol, float rvol)
|
|
{
|
|
float single = *(*samp)++;
|
|
|
|
pair->left += single * lvol;
|
|
pair->right += single * rvol;
|
|
}
|
|
|
|
static inline void
|
|
snd_mix_pair (portable_samplepair_t *pair, float **samp,
|
|
float lvol, float rvol)
|
|
{
|
|
float left = *(*samp)++;
|
|
float right = *(*samp)++;
|
|
|
|
pair->left += left * lvol;
|
|
pair->right += right * rvol;
|
|
}
|
|
|
|
static inline void
|
|
snd_mix_triple (portable_samplepair_t *pair, float **samp,
|
|
float lvol, float rvol)
|
|
{
|
|
float left = *(*samp)++;
|
|
float center = *(*samp)++;
|
|
float right = *(*samp)++;
|
|
|
|
pair->left += left * lvol;
|
|
pair->left += center * lvol;
|
|
pair->right += center * rvol;
|
|
pair->right += right * rvol;
|
|
}
|
|
|
|
/* mono
|
|
center
|
|
Spacializes the sound.
|
|
*/
|
|
static void
|
|
snd_paint_mono (int offs, channel_t *ch, float *sfx, unsigned count)
|
|
{
|
|
float leftvol, rightvol;
|
|
unsigned left_phase, right_phase; // Never allowed < 0 anyway
|
|
unsigned i = 0;
|
|
portable_samplepair_t *pair;
|
|
|
|
leftvol = ch->leftvol * VOLSCALE;
|
|
rightvol = ch->rightvol * VOLSCALE;
|
|
|
|
max_overpaint = max (abs (ch->phase),
|
|
max (abs (ch->oldphase), max_overpaint));
|
|
|
|
pair = snd_paintbuffer + offs;
|
|
|
|
if (ch->phase >= 0) {
|
|
left_phase = ch->phase;
|
|
right_phase = 0;
|
|
} else {
|
|
left_phase = 0;
|
|
right_phase = -ch->phase;
|
|
}
|
|
|
|
if (ch->oldphase != ch->phase) {
|
|
unsigned old_phase_left, old_phase_right;
|
|
unsigned new_phase_left, new_phase_right;
|
|
unsigned count_left, count_right, c;
|
|
|
|
if (ch->oldphase >= 0) {
|
|
old_phase_left = ch->oldphase;
|
|
old_phase_right = 0;
|
|
} else {
|
|
old_phase_left = 0;
|
|
old_phase_right = -ch->oldphase;
|
|
}
|
|
new_phase_left = left_phase;
|
|
new_phase_right = right_phase;
|
|
|
|
if (new_phase_left > old_phase_left)
|
|
count_left = 2 * (new_phase_left - old_phase_left);
|
|
else
|
|
count_left = old_phase_left - new_phase_left;
|
|
|
|
if (new_phase_right > old_phase_right)
|
|
count_right = 2 * (new_phase_right - old_phase_right);
|
|
else
|
|
count_right = old_phase_right - new_phase_right;
|
|
|
|
c = min (count, max (count_right, count_left));
|
|
count -= c;
|
|
while (c) {
|
|
float left = sfx[i] * leftvol;
|
|
float right = sfx[i] * rightvol;
|
|
|
|
if (new_phase_left < old_phase_left) {
|
|
if (!(count_left & 1)) {
|
|
pair[i + old_phase_left].left += left;
|
|
old_phase_left--;
|
|
}
|
|
count_left--;
|
|
} else {
|
|
if (new_phase_left > old_phase_left) {
|
|
pair[i + old_phase_left].left += left;
|
|
old_phase_left++;
|
|
}
|
|
pair[i + old_phase_left].left += left;
|
|
}
|
|
|
|
if (new_phase_right < old_phase_right) {
|
|
if (!(count_right & 1)) {
|
|
pair[i + old_phase_right].right += right;
|
|
old_phase_right--;
|
|
}
|
|
count_right--;
|
|
} else {
|
|
if (new_phase_right > old_phase_right) {
|
|
pair[i + old_phase_right].right += right;
|
|
old_phase_right++;
|
|
}
|
|
pair[i + old_phase_right].right += right;
|
|
}
|
|
|
|
c--;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < count; i++) {
|
|
pair[i + left_phase].left += sfx[i] * leftvol;
|
|
pair[i + right_phase].right += sfx[i] * rightvol;
|
|
}
|
|
}
|
|
|
|
/* stereo
|
|
left, right
|
|
Does not spacialize the sound.
|
|
*/
|
|
static void
|
|
snd_paint_stereo (int offs, channel_t *ch, float *samp, unsigned count)
|
|
{
|
|
portable_samplepair_t *pair;
|
|
float leftvol = ch->leftvol * VOLSCALE;
|
|
float rightvol = ch->rightvol * VOLSCALE;
|
|
|
|
pair = snd_paintbuffer + offs;
|
|
while (count-- > 0) {
|
|
snd_mix_pair (pair, &samp, leftvol, rightvol);
|
|
pair++;
|
|
}
|
|
}
|
|
|
|
/* 1d surround
|
|
left, center, right
|
|
Does not spacialize the sound.
|
|
*/
|
|
static void
|
|
snd_paint_3 (int offs, channel_t *ch, float *samp, unsigned count)
|
|
{
|
|
portable_samplepair_t *pair;
|
|
float leftvol = ch->leftvol * VOLSCALE;
|
|
float rightvol = ch->rightvol * VOLSCALE;
|
|
|
|
pair = snd_paintbuffer + offs;
|
|
while (count-- > 0) {
|
|
snd_mix_triple (pair, &samp, leftvol, rightvol);
|
|
pair++;
|
|
}
|
|
}
|
|
|
|
/* quadraphonic surround
|
|
front (left, right),
|
|
rear (left, right)
|
|
Does not spacialize the sound.
|
|
*/
|
|
static void
|
|
snd_paint_4 (int offs, channel_t *ch, float *samp, unsigned count)
|
|
{
|
|
portable_samplepair_t *pair;
|
|
float leftvol = ch->leftvol * VOLSCALE;
|
|
float rightvol = ch->rightvol * VOLSCALE;
|
|
|
|
pair = snd_paintbuffer + offs;
|
|
while (count-- > 0) {
|
|
snd_mix_pair (pair, &samp, leftvol, rightvol);
|
|
snd_mix_pair (pair, &samp, leftvol, rightvol);
|
|
pair++;
|
|
}
|
|
}
|
|
|
|
/* five-channel surround
|
|
front (left, center, right),
|
|
rear (left, right)
|
|
Does not spacialize the sound.
|
|
*/
|
|
static void
|
|
snd_paint_5 (int offs, channel_t *ch, float *samp, unsigned count)
|
|
{
|
|
portable_samplepair_t *pair;
|
|
float leftvol = ch->leftvol * VOLSCALE;
|
|
float rightvol = ch->rightvol * VOLSCALE;
|
|
|
|
pair = snd_paintbuffer + offs;
|
|
while (count-- > 0) {
|
|
snd_mix_triple (pair, &samp, leftvol, rightvol);
|
|
snd_mix_pair (pair, &samp, leftvol, rightvol);
|
|
pair++;
|
|
}
|
|
}
|
|
|
|
/* 5.1 surround
|
|
front (left, center, right),
|
|
rear (left, right),
|
|
lfe
|
|
Does not spacialize the sound.
|
|
*/
|
|
static void
|
|
snd_paint_6 (int offs, channel_t *ch, float *samp, unsigned count)
|
|
{
|
|
portable_samplepair_t *pair;
|
|
float leftvol = ch->leftvol * VOLSCALE;
|
|
float rightvol = ch->rightvol * VOLSCALE;
|
|
|
|
pair = snd_paintbuffer + offs;
|
|
while (count-- > 0) {
|
|
snd_mix_triple (pair, &samp, leftvol, rightvol);
|
|
snd_mix_pair (pair, &samp, leftvol, rightvol);
|
|
snd_mix_single (pair, &samp, leftvol, rightvol);
|
|
pair++;
|
|
}
|
|
}
|
|
|
|
/* 6.1 surround
|
|
front (left, center, right),
|
|
side (left, right),
|
|
rear (center),
|
|
lfe
|
|
Does not spacialize the sound.
|
|
*/
|
|
static void
|
|
snd_paint_7 (int offs, channel_t *ch, float *samp, unsigned count)
|
|
{
|
|
portable_samplepair_t *pair;
|
|
float leftvol = ch->leftvol * VOLSCALE;
|
|
float rightvol = ch->rightvol * VOLSCALE;
|
|
|
|
pair = snd_paintbuffer + offs;
|
|
while (count-- > 0) {
|
|
snd_mix_triple (pair, &samp, leftvol, rightvol);
|
|
snd_mix_pair (pair, &samp, leftvol, rightvol);
|
|
snd_mix_single (pair, &samp, leftvol, rightvol);
|
|
snd_mix_single (pair, &samp, leftvol, rightvol);
|
|
pair++;
|
|
}
|
|
}
|
|
|
|
/* 7.1 surround
|
|
front (left, center, right),
|
|
side (left, right),
|
|
rear (left, right),
|
|
lfe
|
|
Does not spacialize the sound.
|
|
*/
|
|
static void
|
|
snd_paint_8 (int offs, channel_t *ch, float *samp, unsigned count)
|
|
{
|
|
portable_samplepair_t *pair;
|
|
float leftvol = ch->leftvol * VOLSCALE;
|
|
float rightvol = ch->rightvol * VOLSCALE;
|
|
|
|
pair = snd_paintbuffer + offs;
|
|
while (count-- > 0) {
|
|
snd_mix_triple (pair, &samp, leftvol, rightvol);
|
|
snd_mix_pair (pair, &samp, leftvol, rightvol);
|
|
snd_mix_pair (pair, &samp, leftvol, rightvol);
|
|
snd_mix_single (pair, &samp, leftvol, rightvol);
|
|
pair++;
|
|
}
|
|
}
|
|
|
|
void
|
|
SND_SetPaint (sfxbuffer_t *sb)
|
|
{
|
|
static sfxpaint_t *painters[] = {
|
|
0,
|
|
snd_paint_mono,
|
|
snd_paint_stereo,
|
|
snd_paint_3,
|
|
snd_paint_4,
|
|
snd_paint_5,
|
|
snd_paint_6,
|
|
snd_paint_7,
|
|
snd_paint_8,
|
|
};
|
|
|
|
if (sb->channels > 8 || !sb->channels)
|
|
Sys_Error ("invaliid channel count %d", sb->channels);
|
|
sb->paint = painters[sb->channels];
|
|
}
|