341 lines
7.4 KiB
C
341 lines
7.4 KiB
C
/*
|
|
Copyright (C) 1996-2001 Id Software, Inc.
|
|
Copyright (C) 2010-2011 O. Sezer <sezero@users.sourceforge.net>
|
|
|
|
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 the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
*/
|
|
// snd_mix.c -- portable code to mix sounds for snd_dma.c
|
|
|
|
#include "quakedef.h"
|
|
|
|
#define PAINTBUFFER_SIZE 2048
|
|
portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE];
|
|
int snd_scaletable[32][256];
|
|
int *snd_p, snd_linear_count;
|
|
short *snd_out;
|
|
|
|
static int snd_vol;
|
|
|
|
static void Snd_WriteLinearBlastStereo16 (void)
|
|
{
|
|
int i;
|
|
int val;
|
|
|
|
for (i = 0; i < snd_linear_count; i += 2)
|
|
{
|
|
val = snd_p[i] >> 8;
|
|
if (val > 0x7fff)
|
|
snd_out[i] = 0x7fff;
|
|
else if (val < (short)0x8000)
|
|
snd_out[i] = (short)0x8000;
|
|
else
|
|
snd_out[i] = val;
|
|
|
|
val = snd_p[i+1] >> 8;
|
|
if (val > 0x7fff)
|
|
snd_out[i+1] = 0x7fff;
|
|
else if (val < (short)0x8000)
|
|
snd_out[i+1] = (short)0x8000;
|
|
else
|
|
snd_out[i+1] = val;
|
|
}
|
|
}
|
|
|
|
static void S_TransferStereo16 (int endtime)
|
|
{
|
|
int lpos;
|
|
int lpaintedtime;
|
|
|
|
snd_p = (int *) paintbuffer;
|
|
lpaintedtime = paintedtime;
|
|
|
|
while (lpaintedtime < endtime)
|
|
{
|
|
// handle recirculating buffer issues
|
|
lpos = lpaintedtime & ((shm->samples >> 1) - 1);
|
|
|
|
snd_out = (short *)shm->buffer + (lpos << 1);
|
|
|
|
snd_linear_count = (shm->samples >> 1) - lpos;
|
|
if (lpaintedtime + snd_linear_count > endtime)
|
|
snd_linear_count = endtime - lpaintedtime;
|
|
|
|
snd_linear_count <<= 1;
|
|
|
|
// write a linear blast of samples
|
|
Snd_WriteLinearBlastStereo16 ();
|
|
|
|
snd_p += snd_linear_count;
|
|
lpaintedtime += (snd_linear_count >> 1);
|
|
}
|
|
}
|
|
|
|
static void S_TransferPaintBuffer (int endtime)
|
|
{
|
|
int out_idx, out_mask;
|
|
int count, step, val;
|
|
int *p;
|
|
|
|
if (shm->samplebits == 16 && shm->channels == 2)
|
|
{
|
|
S_TransferStereo16 (endtime);
|
|
return;
|
|
}
|
|
|
|
p = (int *) paintbuffer;
|
|
count = (endtime - paintedtime) * shm->channels;
|
|
out_mask = shm->samples - 1;
|
|
out_idx = paintedtime * shm->channels & out_mask;
|
|
step = 3 - shm->channels;
|
|
|
|
if (shm->samplebits == 16)
|
|
{
|
|
short *out = (short *)shm->buffer;
|
|
while (count--)
|
|
{
|
|
val = *p >> 8;
|
|
p+= step;
|
|
if (val > 0x7fff)
|
|
val = 0x7fff;
|
|
else if (val < (short)0x8000)
|
|
val = (short)0x8000;
|
|
out[out_idx] = val;
|
|
out_idx = (out_idx + 1) & out_mask;
|
|
}
|
|
}
|
|
else if (shm->samplebits == 8 && !shm->signed8)
|
|
{
|
|
unsigned char *out = shm->buffer;
|
|
while (count--)
|
|
{
|
|
val = *p >> 8;
|
|
p+= step;
|
|
if (val > 0x7fff)
|
|
val = 0x7fff;
|
|
else if (val < (short)0x8000)
|
|
val = (short)0x8000;
|
|
out[out_idx] = (val >> 8) + 128;
|
|
out_idx = (out_idx + 1) & out_mask;
|
|
}
|
|
}
|
|
else if (shm->samplebits == 8) /* S8 format, e.g. with Amiga AHI */
|
|
{
|
|
signed char *out = (signed char *) shm->buffer;
|
|
while (count--)
|
|
{
|
|
val = *p >> 8;
|
|
p+= step;
|
|
if (val > 0x7fff)
|
|
val = 0x7fff;
|
|
else if (val < (short)0x8000)
|
|
val = (short)0x8000;
|
|
out[out_idx] = (val >> 8);
|
|
out_idx = (out_idx + 1) & out_mask;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
===============================================================================
|
|
|
|
CHANNEL MIXING
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
static void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int endtime);
|
|
static void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int endtime);
|
|
|
|
void S_PaintChannels (int endtime)
|
|
{
|
|
int i;
|
|
int end, ltime, count;
|
|
channel_t *ch;
|
|
sfxcache_t *sc;
|
|
|
|
snd_vol = sfxvolume.value * 256;
|
|
|
|
while (paintedtime < endtime)
|
|
{
|
|
// if paintbuffer is smaller than DMA buffer
|
|
end = endtime;
|
|
if (endtime - paintedtime > PAINTBUFFER_SIZE)
|
|
end = paintedtime + PAINTBUFFER_SIZE;
|
|
|
|
// clear the paint buffer
|
|
if (s_rawend < paintedtime)
|
|
{ // clear
|
|
memset(paintbuffer, 0, (end - paintedtime) * sizeof(portable_samplepair_t));
|
|
}
|
|
else
|
|
{ // copy from the streaming sound source
|
|
int s;
|
|
int stop;
|
|
|
|
stop = (end < s_rawend) ? end : s_rawend;
|
|
|
|
for (i = paintedtime; i < stop; i++)
|
|
{
|
|
s = i & (MAX_RAW_SAMPLES - 1);
|
|
paintbuffer[i - paintedtime] = s_rawsamples[s];
|
|
}
|
|
// if (i != end)
|
|
// Con_Printf ("partial stream\n");
|
|
// else
|
|
// Con_Printf ("full stream\n");
|
|
for ( ; i < end; i++)
|
|
{
|
|
paintbuffer[i - paintedtime].left =
|
|
paintbuffer[i - paintedtime].right = 0;
|
|
}
|
|
}
|
|
|
|
// paint in the channels.
|
|
ch = snd_channels;
|
|
for (i = 0; i < total_channels; i++, ch++)
|
|
{
|
|
if (!ch->sfx)
|
|
continue;
|
|
if (!ch->leftvol && !ch->rightvol)
|
|
continue;
|
|
sc = S_LoadSound (ch->sfx);
|
|
if (!sc)
|
|
continue;
|
|
|
|
ltime = paintedtime;
|
|
|
|
while (ltime < end)
|
|
{ // paint up to end
|
|
if (ch->end < end)
|
|
count = ch->end - ltime;
|
|
else
|
|
count = end - ltime;
|
|
|
|
if (count > 0)
|
|
{
|
|
if (sc->width == 1)
|
|
SND_PaintChannelFrom8(ch, sc, count);
|
|
else
|
|
SND_PaintChannelFrom16(ch, sc, count);
|
|
|
|
ltime += count;
|
|
}
|
|
|
|
// if at end of loop, restart
|
|
if (ltime >= ch->end)
|
|
{
|
|
if (sc->loopstart >= 0)
|
|
{
|
|
ch->pos = sc->loopstart;
|
|
ch->end = ltime + sc->length - ch->pos;
|
|
}
|
|
else
|
|
{ // channel just stopped
|
|
ch->sfx = NULL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// transfer out according to DMA format
|
|
S_TransferPaintBuffer(end);
|
|
paintedtime = end;
|
|
}
|
|
}
|
|
|
|
void SND_InitScaletable (void)
|
|
{
|
|
int i, j;
|
|
int scale;
|
|
|
|
for (i = 0; i < 32; i++)
|
|
{
|
|
scale = i * 8 * 256 * sfxvolume.value;
|
|
for (j = 0; j < 256; j++)
|
|
{
|
|
/* When compiling with gcc-4.1.0 at optimisations O1 and
|
|
higher, the tricky signed char type conversion is not
|
|
guaranteed. Therefore we explicity calculate the signed
|
|
value from the index as required. From Kevin Shanahan.
|
|
See: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26719
|
|
*/
|
|
// snd_scaletable[i][j] = ((signed char)j) * scale;
|
|
snd_scaletable[i][j] = ((j < 128) ? j : j - 0xff) * scale;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int count)
|
|
{
|
|
int data;
|
|
int *lscale, *rscale;
|
|
unsigned char *sfx;
|
|
int i;
|
|
|
|
if (ch->leftvol > 255)
|
|
ch->leftvol = 255;
|
|
if (ch->rightvol > 255)
|
|
ch->rightvol = 255;
|
|
|
|
lscale = snd_scaletable[ch->leftvol >> 3];
|
|
rscale = snd_scaletable[ch->rightvol >> 3];
|
|
sfx = (unsigned char *)sc->data + ch->pos;
|
|
|
|
for (i = 0; i < count; i++)
|
|
{
|
|
data = sfx[i];
|
|
paintbuffer[i].left += lscale[data];
|
|
paintbuffer[i].right += rscale[data];
|
|
}
|
|
|
|
ch->pos += count;
|
|
}
|
|
|
|
static void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int count)
|
|
{
|
|
int data;
|
|
int left, right;
|
|
int leftvol, rightvol;
|
|
signed short *sfx;
|
|
int i;
|
|
|
|
leftvol = ch->leftvol * snd_vol;
|
|
rightvol = ch->rightvol * snd_vol;
|
|
leftvol >>= 8;
|
|
rightvol >>= 8;
|
|
sfx = (signed short *)sc->data + ch->pos;
|
|
|
|
for (i = 0; i < count; i++)
|
|
{
|
|
data = sfx[i];
|
|
// this was causing integer overflow as observed in quakespasm
|
|
// with the warpspasm mod moved >>8 to left/right volume above.
|
|
// left = (data * leftvol) >> 8;
|
|
// right = (data * rightvol) >> 8;
|
|
left = data * leftvol;
|
|
right = data * rightvol;
|
|
paintbuffer[i].left += left;
|
|
paintbuffer[i].right += right;
|
|
}
|
|
|
|
ch->pos += count;
|
|
}
|
|
|