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newtree/source/snd_mix.c
Jeff Teunissen 54e2a4d9d3 Okay, the big whitespace reformat. There is some silliness (case 
statements, variable declarations), but all in all it's not bad.
2000-12-08 06:51:37 +00:00

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/*
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
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "sound.h"
#include "console.h"
// fixme: Damn crappy complier doesn't allow me to UNDEF _win32 on command line!
#ifdef WIN32SDL
#undef _WIN32
#endif
#ifdef _WIN32
#include "winquake.h"
#else
#define DWORD unsigned long
#endif
#define PAINTBUFFER_SIZE 512
portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE];
int snd_scaletable[32][256];
int *snd_p, snd_linear_count, snd_vol;
short *snd_out;
void Snd_WriteLinearBlastStereo16 (void);
#ifndef USE_INTEL_ASM
void
Snd_WriteLinearBlastStereo16 (void)
{
int i;
int val;
for (i = 0; i < snd_linear_count; i += 2) {
val = (snd_p[i] * snd_vol) >> 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] * snd_vol) >> 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;
}
}
#endif
void
S_TransferStereo16 (int endtime)
{
int lpos;
int lpaintedtime;
DWORD *pbuf;
#ifdef _WIN32
int reps;
DWORD dwSize, dwSize2;
DWORD *pbuf2;
HRESULT hresult;
#endif
snd_vol = volume->value * 256;
snd_p = (int *) paintbuffer;
lpaintedtime = paintedtime;
#ifdef _WIN32
if (pDSBuf) {
reps = 0;
while ((hresult = pDSBuf->lpVtbl->Lock (pDSBuf, 0, gSndBufSize,
(LPVOID *) & pbuf, &dwSize,
(LPVOID *) & pbuf2, &dwSize2,
0)) != DS_OK) {
if (hresult != DSERR_BUFFERLOST) {
Con_Printf
("S_TransferStereo16: DS::Lock Sound Buffer Failed\n");
S_Shutdown ();
S_Startup ();
return;
}
if (++reps > 10000) {
Con_Printf
("S_TransferStereo16: DS: couldn't restore buffer\n");
S_Shutdown ();
S_Startup ();
return;
}
}
} else
#endif
{
pbuf = (DWORD *) shm->buffer;
}
while (lpaintedtime < endtime) {
// handle recirculating buffer issues
lpos = lpaintedtime & ((shm->samples >> 1) - 1);
snd_out = (short *) pbuf + (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);
}
#ifdef _WIN32
if (pDSBuf)
pDSBuf->lpVtbl->Unlock (pDSBuf, pbuf, dwSize, NULL, 0);
#endif
}
void
S_TransferPaintBuffer (int endtime)
{
int out_idx;
int count;
int out_mask;
int *p;
int step;
int val;
int snd_vol;
DWORD *pbuf;
#ifdef _WIN32
int reps;
DWORD dwSize, dwSize2;
DWORD *pbuf2;
HRESULT hresult;
#endif
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;
snd_vol = volume->value * 256;
#ifdef _WIN32
if (pDSBuf) {
reps = 0;
while ((hresult = pDSBuf->lpVtbl->Lock (pDSBuf, 0, gSndBufSize,
(LPVOID *) & pbuf, &dwSize,
(LPVOID *) & pbuf2, &dwSize2,
0)) != DS_OK) {
if (hresult != DSERR_BUFFERLOST) {
Con_Printf
("S_TransferPaintBuffer: DS::Lock Sound Buffer Failed\n");
S_Shutdown ();
S_Startup ();
return;
}
if (++reps > 10000) {
Con_Printf
("S_TransferPaintBuffer: DS: couldn't restore buffer\n");
S_Shutdown ();
S_Startup ();
return;
}
}
} else
#endif
{
pbuf = (DWORD *) shm->buffer;
}
if (shm->samplebits == 16) {
short *out = (short *) pbuf;
while (count--) {
val = (*p * snd_vol) >> 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) {
unsigned char *out = (unsigned char *) pbuf;
while (count--) {
val = (*p * snd_vol) >> 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;
}
}
#ifdef _WIN32
if (pDSBuf) {
DWORD dwNewpos, dwWrite;
int il = paintedtime;
int ir = endtime - paintedtime;
ir += il;
pDSBuf->lpVtbl->Unlock (pDSBuf, pbuf, dwSize, NULL, 0);
pDSBuf->lpVtbl->GetCurrentPosition (pDSBuf, &dwNewpos, &dwWrite);
// if ((dwNewpos >= il) && (dwNewpos <= ir))
// Con_Printf("%d-%d p %d c\n", il, ir, dwNewpos);
}
#endif
}
/*
===============================================================================
CHANNEL MIXING
===============================================================================
*/
void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int endtime);
void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int endtime);
void
S_PaintChannels (int endtime)
{
int i;
int end;
channel_t *ch;
sfxcache_t *sc;
int ltime, count;
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
memset (paintbuffer, 0,
(end - paintedtime) * sizeof (portable_samplepair_t));
// paint in the channels.
ch = 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;
for (i = 0; i < 32; i++)
for (j = 0; j < 256; j++)
snd_scaletable[i][j] = ((signed char) j) * i * 8;
}
#ifndef USE_INTEL_ASM
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 = (signed 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;
}
#endif // !USE_INTEL_ASM
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;
rightvol = ch->rightvol;
sfx = (signed short *) sc->data + ch->pos;
for (i = 0; i < count; i++) {
data = sfx[i];
left = (data * leftvol) >> 8;
right = (data * rightvol) >> 8;
paintbuffer[i].left += left;
paintbuffer[i].right += right;
}
ch->pos += count;
}
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