367 lines
8.2 KiB
C
367 lines
8.2 KiB
C
/*
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snd_mix.c
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portable code to mix sounds for snd_dma.c
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((used)) const char rcsid[] =
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"$Id$";
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "winquake.h"
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#include "QF/cvar.h"
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#include "QF/sound.h"
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#include "QF/sys.h"
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#include "compat.h"
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#include "snd_render.h"
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cvar_t *snd_volume;
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unsigned snd_paintedtime; // sample PAIRS
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portable_samplepair_t snd_paintbuffer[PAINTBUFFER_SIZE * 2];
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static int max_overpaint; // number of extra samples painted
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// due to phase shift
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static int snd_scaletable[32][256];
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/* CHANNEL MIXING */
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static inline int
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check_channel_end (channel_t *ch, sfx_t *sfx, int count, unsigned ltime)
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{
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if (count <= 0 || ltime >= ch->end) {
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if (sfx->loopstart != (unsigned) -1) {
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ch->pos = sfx->loopstart;
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ch->end = ltime + sfx->length - ch->pos;
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} else { // channel just stopped
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ch->done = 1;
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return 1;
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}
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}
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return 0;
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}
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static inline void
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snd_paint_channel (channel_t *ch, sfxbuffer_t *sc, int count)
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{
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unsigned pos;
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int offs = 0;
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byte *samps;
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if ((int) ch->pos < 0) {
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ch->pos += count;
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if ((int) ch->pos <= 0)
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return;
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offs = count - ch->pos;
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count -= offs;
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ch->pos = 0;
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}
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if (ch->pos < sc->pos || ch->pos - sc->pos >= sc->length)
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sc->setpos (sc, ch->pos);
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pos = (ch->pos - sc->pos + sc->tail) % sc->length;
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samps = sc->data + pos * sc->bps;
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if (pos + count > sc->length) {
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unsigned sub = sc->length - pos;
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sc->paint (offs, ch, samps, sub);
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sc->paint (offs + sub, ch, sc->data, count - sub);
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} else {
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sc->paint (offs, ch, samps, count);
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}
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ch->pos += count;
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}
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void
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SND_PaintChannels (unsigned endtime)
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{
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unsigned end, ltime;
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int i, count;
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channel_t *ch;
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sfx_t *sfx;
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sfxbuffer_t *sc;
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// clear the paint buffer
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memset (snd_paintbuffer, 0, sizeof (snd_paintbuffer));
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while (snd_paintedtime < endtime) {
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// if snd_paintbuffer is smaller than DMA buffer
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end = endtime;
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if (end - snd_paintedtime > PAINTBUFFER_SIZE)
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end = snd_paintedtime + PAINTBUFFER_SIZE;
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max_overpaint = 0;
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// paint in the channels.
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ch = snd_channels;
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for (i = 0; i < snd_total_channels; i++, ch++) {
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if (!(sfx = ch->sfx))
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continue;
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if (ch->stop || ch->done) {
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ch->done = 1; // acknowledge stopped signal
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continue;
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}
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if (ch->pause)
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continue;
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sc = sfx->getbuffer (sfx);
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if (!sc) { // something went wrong with the sfx
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printf ("XXXX sfx blew up!!!!\n");
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continue;
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}
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if (!ch->end)
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ch->end = snd_paintedtime + sfx->length - ch->pos;
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ltime = snd_paintedtime;
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while (ltime < end) { // paint up to end
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count = ((ch->end < end) ? ch->end : end) - ltime;
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if (count > 0) {
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if (ch->leftvol || ch->rightvol) {
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snd_paint_channel (ch, sc, count);
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if (sc->advance)
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sc->advance (sc, count);
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}
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ltime += count;
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}
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if (check_channel_end (ch, sfx, count, ltime))
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break;
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}
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}
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// transfer out according to DMA format
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snd_shm->xfer (end);
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memmove (snd_paintbuffer, snd_paintbuffer + end - snd_paintedtime,
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max_overpaint * sizeof (snd_paintbuffer[0]));
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memset (snd_paintbuffer + max_overpaint, 0, sizeof (snd_paintbuffer)
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- max_overpaint * sizeof (snd_paintbuffer[0]));
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snd_paintedtime = end;
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}
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}
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void
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SND_InitScaletable (void)
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{
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int i, j;
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for (i = 0; i < 32; i++)
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for (j = 0; j < 256; j++)
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snd_scaletable[i][j] = ((signed char) j) * i * 8;
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}
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static void
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snd_paint_mono_8 (int offs, channel_t *ch, void *bytes, unsigned count)
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{
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byte *sfx;
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int data;
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unsigned i;
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int *lscale, *rscale;
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portable_samplepair_t *pair;
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if (ch->leftvol > 255)
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ch->leftvol = 255;
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if (ch->rightvol > 255)
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ch->rightvol = 255;
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lscale = snd_scaletable[ch->leftvol >> 3];
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rscale = snd_scaletable[ch->rightvol >> 3];
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sfx = (byte *) bytes;
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pair = snd_paintbuffer + offs;
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for (i = 0; i < count; i++) {
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data = sfx[i];
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pair[i].left += lscale[data];
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pair[i].right += rscale[data];
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}
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}
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static void
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snd_paint_mono_16 (int offs, channel_t *ch, void *bytes, unsigned count)
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{
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int leftvol, rightvol;
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unsigned left_phase, right_phase; // Never allowed < 0 anyway
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unsigned i = 0;
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short *sfx;
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portable_samplepair_t *pair;
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leftvol = ch->leftvol;
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rightvol = ch->rightvol;
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max_overpaint = max (abs (ch->phase),
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max (abs (ch->oldphase), max_overpaint));
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sfx = (signed short *) bytes;
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pair = snd_paintbuffer + offs;
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if (ch->phase >= 0) {
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left_phase = ch->phase;
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right_phase = 0;
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} else {
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left_phase = 0;
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right_phase = -ch->phase;
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}
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if (ch->oldphase != ch->phase) {
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unsigned old_phase_left, old_phase_right;
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unsigned new_phase_left, new_phase_right;
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unsigned count_left, count_right, c;
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if (ch->oldphase >= 0) {
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old_phase_left = ch->oldphase;
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old_phase_right = 0;
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} else {
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old_phase_left = 0;
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old_phase_right = -ch->oldphase;
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}
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new_phase_left = left_phase;
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new_phase_right = right_phase;
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if (new_phase_left > old_phase_left)
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count_left = 2 * (new_phase_left - old_phase_left);
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else
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count_left = old_phase_left - new_phase_left;
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if (new_phase_right > old_phase_right)
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count_right = 2 * (new_phase_right - old_phase_right);
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else
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count_right = old_phase_right - new_phase_right;
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c = min (count, max (count_right, count_left));
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count -= c;
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while (c) {
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int left = (sfx[i] * leftvol) >> 8;
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int right = (sfx[i] * rightvol) >> 8;
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if (new_phase_left < old_phase_left) {
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if (!(count_left & 1)) {
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pair[i + old_phase_left].left += left;
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old_phase_left--;
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}
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count_left--;
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} else {
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if (new_phase_left > old_phase_left) {
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pair[i + old_phase_left].left += left;
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old_phase_left++;
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}
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pair[i + old_phase_left].left += left;
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}
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if (new_phase_right < old_phase_right) {
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if (!(count_right & 1)) {
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pair[i + old_phase_right].right += right;
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old_phase_right--;
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}
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count_right--;
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} else {
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if (new_phase_right > old_phase_right) {
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pair[i + old_phase_right].right += right;
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old_phase_right++;
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}
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pair[i + old_phase_right].right += right;
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}
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c--;
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i++;
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}
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}
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for (i = 0; i < count; i++) {
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pair[i + left_phase].left += (sfx[i] * leftvol) >> 8;
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pair[i + right_phase].right += (sfx[i] * rightvol) >> 8;
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}
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}
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static void
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snd_paint_stereo_8 (int offs, channel_t *ch, void *bytes, unsigned count)
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{
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byte *samp;
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portable_samplepair_t *pair;
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int *lscale, *rscale;
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if (ch->leftvol > 255)
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ch->leftvol = 255;
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if (ch->rightvol > 255)
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ch->rightvol = 255;
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lscale = snd_scaletable[ch->leftvol >> 3];
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rscale = snd_scaletable[ch->rightvol >> 3];
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samp = bytes;
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pair = snd_paintbuffer + offs;
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while (count-- > 0) {
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pair->left += lscale[*samp++];
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pair->right += rscale[*samp++];
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pair++;
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}
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}
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static void
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snd_paint_stereo_16 (int offs, channel_t *ch, void *bytes, unsigned count)
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{
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short *samp;
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portable_samplepair_t *pair;
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int leftvol = ch->leftvol;
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int rightvol = ch->rightvol;
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samp = (short *) bytes;
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pair = snd_paintbuffer + offs;
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while (count-- > 0) {
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pair->left += (*samp++ * leftvol) >> 8;
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pair->right += (*samp++ * rightvol) >> 8;
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pair++;
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}
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}
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void
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SND_SetPaint (sfxbuffer_t *sc)
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{
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wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
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if (snd_loadas8bit->int_val) {
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if (info->channels == 2)
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sc->paint = snd_paint_stereo_8;
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else
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sc->paint = snd_paint_mono_8;
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} else {
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if (info->channels == 2)
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sc->paint = snd_paint_stereo_16;
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else
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sc->paint = snd_paint_mono_16;
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}
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}
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