snd_mix.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 // snd_mix.c -- portable code to mix sounds for snd_dma.c
  21
  22 #include "quakedef.h"
  23
  24 #ifdef WIN32
  25 #include "winquake.h"
  26 #else
  27 #define DWORD   unsigned long
  28 #endif
  29
  30 #define PAINTBUFFER_SIZE        512
  31 portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE];
  32 int             snd_scaletable[32][256];
  33 int     *snd_p, snd_linear_count, snd_vol;
  34 short   *snd_out;
  35
  36 void Snd_WriteLinearBlastStereo16 (void);
  37
  38 #if     !id386
  39 void Snd_WriteLinearBlastStereo16 (void)
  40 {
  41         int             i;
  42         int             val;
  43
  44         for (i=0 ; i<snd_linear_count ; i+=2)
  45         {
  46                 val = (snd_p[i]*snd_vol)>>8;
  47                 if (val > 0x7fff)
  48                         snd_out[i] = 0x7fff;
  49                 else if (val < (short)0x8000)
  50                         snd_out[i] = (short)0x8000;
  51                 else
  52                         snd_out[i] = val;
  53
  54                 val = (snd_p[i+1]*snd_vol)>>8;
  55                 if (val > 0x7fff)
  56                         snd_out[i+1] = 0x7fff;
  57                 else if (val < (short)0x8000)
  58                         snd_out[i+1] = (short)0x8000;
  59                 else
  60                         snd_out[i+1] = val;
  61         }
  62 }
  63 #endif
  64
  65 void S_TransferStereo16 (int endtime)
  66 {
  67         int             lpos;
  68         int             lpaintedtime;
  69         DWORD   *pbuf;
  70 #ifdef WIN32
  71         int             reps;
  72         DWORD   dwSize,dwSize2;
  73         DWORD   *pbuf2;
  74         HRESULT hresult;
  75 #endif
  76
  77         snd_vol = volume.value*256;
  78
  79         snd_p = (int *) paintbuffer;
  80         lpaintedtime = paintedtime;
  81
  82 #ifdef WIN32
  83         if (pDSBuf)
  84         {
  85                 reps = 0;
  86
  87                 while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize,
  88                                                                            &pbuf2, &dwSize2, 0)) != DS_OK)
  89                 {
  90                         if (hresult != DSERR_BUFFERLOST)
  91                         {
  92                                 Con_Printf ("S_TransferStereo16: DS::Lock Sound Buffer Failed\n");
  93                                 S_Shutdown ();
  94                                 S_Startup ();
  95                                 return;
  96                         }
  97
  98                         if (++reps > 10000)
  99                         {
 100                                 Con_Printf ("S_TransferStereo16: DS: couldn't restore buffer\n");
 101                                 S_Shutdown ();
 102                                 S_Startup ();
 103                                 return;
 104                         }
 105                 }
 106         }
 107         else
 108 #endif
 109         {
 110                 pbuf = (DWORD *)shm->buffer;
 111         }
 112
 113         while (lpaintedtime < endtime)
 114         {
 115         // handle recirculating buffer issues
 116                 lpos = lpaintedtime & ((shm->samples>>1)-1);
 117
 118                 snd_out = (short *) pbuf + (lpos<<1);
 119
 120                 snd_linear_count = (shm->samples>>1) - lpos;
 121                 if (lpaintedtime + snd_linear_count > endtime)
 122                         snd_linear_count = endtime - lpaintedtime;
 123
 124                 snd_linear_count <<= 1;
 125
 126         // write a linear blast of samples
 127                 Snd_WriteLinearBlastStereo16 ();
 128
 129                 snd_p += snd_linear_count;
 130                 lpaintedtime += (snd_linear_count>>1);
 131         }
 132
 133 #ifdef WIN32
 134         if (pDSBuf)
 135                 pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);
 136 #endif
 137 }
 138
 139 void S_TransferPaintBuffer(int endtime)
 140 {
 141         int     out_idx;
 142         int     count;
 143         int     out_mask;
 144         int     *p;
 145         int     step;
 146         int             val;
 147         int             snd_vol;
 148         DWORD   *pbuf;
 149 #ifdef WIN32
 150         int             reps;
 151         DWORD   dwSize,dwSize2;
 152         DWORD   *pbuf2;
 153         HRESULT hresult;
 154 #endif
 155
 156         if (shm->samplebits == 16 && shm->channels == 2)
 157         {
 158                 S_TransferStereo16 (endtime);
 159                 return;
 160         }
 161
 162         p = (int *) paintbuffer;
 163         count = (endtime - paintedtime) * shm->channels;
 164         out_mask = shm->samples - 1;
 165         out_idx = paintedtime * shm->channels & out_mask;
 166         step = 3 - shm->channels;
 167         snd_vol = volume.value*256;
 168
 169 #ifdef WIN32
 170         if (pDSBuf)
 171         {
 172                 reps = 0;
 173
 174                 while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize,
 175                                                                            &pbuf2,&dwSize2, 0)) != DS_OK)
 176                 {
 177                         if (hresult != DSERR_BUFFERLOST)
 178                         {
 179                                 Con_Printf ("S_TransferPaintBuffer: DS::Lock Sound Buffer Failed\n");
 180                                 S_Shutdown ();
 181                                 S_Startup ();
 182                                 return;
 183                         }
 184
 185                         if (++reps > 10000)
 186                         {
 187                                 Con_Printf ("S_TransferPaintBuffer: DS: couldn't restore buffer\n");
 188                                 S_Shutdown ();
 189                                 S_Startup ();
 190                                 return;
 191                         }
 192                 }
 193         }
 194         else
 195 #endif
 196         {
 197                 pbuf = (DWORD *)shm->buffer;
 198         }
 199
 200         if (shm->samplebits == 16)
 201         {
 202                 short *out = (short *) pbuf;
 203                 while (count--)
 204                 {
 205                         val = (*p * snd_vol) >> 8;
 206                         p+= step;
 207                         if (val > 0x7fff)
 208                                 val = 0x7fff;
 209                         else if (val < (short)0x8000)
 210                                 val = (short)0x8000;
 211                         out[out_idx] = val;
 212                         out_idx = (out_idx + 1) & out_mask;
 213                 }
 214         }
 215         else if (shm->samplebits == 8)
 216         {
 217                 unsigned char *out = (unsigned char *) pbuf;
 218                 while (count--)
 219                 {
 220                         val = (*p * snd_vol) >> 8;
 221                         p+= step;
 222                         if (val > 0x7fff)
 223                                 val = 0x7fff;
 224                         else if (val < (short)0x8000)
 225                                 val = (short)0x8000;
 226                         out[out_idx] = (val>>8) + 128;
 227                         out_idx = (out_idx + 1) & out_mask;
 228                 }
 229         }
 230
 231 #ifdef WIN32
 232         if (pDSBuf) {
 233                 DWORD dwNewpos, dwWrite;
 234                 int il = paintedtime;
 235                 int ir = endtime - paintedtime;
 236
 237                 ir += il;
 238
 239                 pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);
 240
 241                 pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &dwNewpos, &dwWrite);
 242
 243 //              if ((dwNewpos >= il) && (dwNewpos <= ir))
 244 //                      Con_Printf("%d-%d p %d c\n", il, ir, dwNewpos);
 245         }
 246 #endif
 247 }
 248
 249
 250 /*
 251 ===============================================================================
 252
 253 CHANNEL MIXING
 254
 255 ===============================================================================
 256 */
 257
 258 void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int endtime);
 259 void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int endtime);
 260
 261 void S_PaintChannels(int endtime)
 262 {
 263         int     i;
 264         int     end;
 265         channel_t *ch;
 266         sfxcache_t      *sc;
 267         int             ltime, count;
 268
 269         while (paintedtime < endtime)
 270         {
 271         // if paintbuffer is smaller than DMA buffer
 272                 end = endtime;
 273                 if (endtime - paintedtime > PAINTBUFFER_SIZE)
 274                         end = paintedtime + PAINTBUFFER_SIZE;
 275
 276         // clear the paint buffer
 277                 Q_memset(paintbuffer, 0, (end - paintedtime) * sizeof(portable_samplepair_t));
 278
 279         // paint in the channels.
 280                 ch = channels;
 281                 for (i=0; i<total_channels ; i++, ch++)
 282                 {
 283                         if (!ch->sfx)
 284                                 continue;
 285                         if (!ch->leftvol && !ch->rightvol)
 286                                 continue;
 287                         sc = S_LoadSound (ch->sfx);
 288                         if (!sc)
 289                                 continue;
 290
 291                         ltime = paintedtime;
 292
 293                         while (ltime < end)
 294                         {       // paint up to end
 295                                 if (ch->end < end)
 296                                         count = ch->end - ltime;
 297                                 else
 298                                         count = end - ltime;
 299
 300                                 if (count > 0)
 301                                 {
 302                                         if (sc->width == 1)
 303                                                 SND_PaintChannelFrom8(ch, sc, count);
 304                                         else
 305                                                 SND_PaintChannelFrom16(ch, sc, count);
 306
 307                                         ltime += count;
 308                                 }
 309
 310                         // if at end of loop, restart
 311                                 if (ltime >= ch->end)
 312                                 {
 313                                         if (sc->loopstart >= 0)
 314                                         {
 315                                                 ch->pos = sc->loopstart;
 316                                                 ch->end = ltime + sc->length - ch->pos;
 317                                         }
 318                                         else
 319                                         {       // channel just stopped
 320                                                 ch->sfx = NULL;
 321                                                 break;
 322                                         }
 323                                 }
 324                         }
 325
 326                 }
 327
 328         // transfer out according to DMA format
 329                 S_TransferPaintBuffer(end);
 330                 paintedtime = end;
 331         }
 332 }
 333
 334 void SND_InitScaletable (void)
 335 {
 336         int             i, j;
 337
 338         for (i=0 ; i<32 ; i++)
 339                 for (j=0 ; j<256 ; j++)
 340                         snd_scaletable[i][j] = ((signed char)j) * i * 8;
 341 }
 342
 343
 344 #if     !id386
 345
 346 void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int count)
 347 {
 348         int     data;
 349         int             *lscale, *rscale;
 350         unsigned char *sfx;
 351         int             i;
 352
 353         if (ch->leftvol > 255)
 354                 ch->leftvol = 255;
 355         if (ch->rightvol > 255)
 356                 ch->rightvol = 255;
 357
 358         lscale = snd_scaletable[ch->leftvol >> 3];
 359         rscale = snd_scaletable[ch->rightvol >> 3];
 360         sfx = (signed char *)sc->data + ch->pos;
 361
 362         for (i=0 ; i<count ; i++)
 363         {
 364                 data = sfx[i];
 365                 paintbuffer[i].left += lscale[data];
 366                 paintbuffer[i].right += rscale[data];
 367         }
 368
 369         ch->pos += count;
 370 }
 371
 372 #endif  // !id386
 373
 374
 375 void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int count)
 376 {
 377         int data;
 378         int left, right;
 379         int leftvol, rightvol;
 380         signed short *sfx;
 381         int     i;
 382
 383         leftvol = ch->leftvol;
 384         rightvol = ch->rightvol;
 385         sfx = (signed short *)sc->data + ch->pos;
 386
 387         for (i=0 ; i<count ; i++)
 388         {
 389                 data = sfx[i];
 390                 left = (data * leftvol) >> 8;
 391                 right = (data * rightvol) >> 8;
 392                 paintbuffer[i].left += left;
 393                 paintbuffer[i].right += right;
 394         }
 395
 396         ch->pos += count;
 397 }
 398