mirror of
https://git.code.sf.net/p/quake/nuq
synced 2024-11-22 20:21:41 +00:00
409 lines
7.8 KiB
C
409 lines
7.8 KiB
C
/*
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snd_mix.c
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@description@
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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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$Id$
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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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#include "quakedef.h"
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#ifdef _WIN32
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#include "winquake.h"
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#else
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#define DWORD unsigned long
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#endif
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#define PAINTBUFFER_SIZE 512
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portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE];
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int snd_scaletable[32][256];
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int *snd_p, snd_linear_count, snd_vol;
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short *snd_out;
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void Snd_WriteLinearBlastStereo16 (void);
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#ifndef USE_INTEL_ASM
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void Snd_WriteLinearBlastStereo16 (void)
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{
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int i;
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int val;
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for (i=0 ; i<snd_linear_count ; i+=2)
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{
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val = (snd_p[i]*snd_vol)>>8;
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if (val > 0x7fff)
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snd_out[i] = 0x7fff;
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else if (val < (short)0x8000)
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snd_out[i] = (short)0x8000;
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else
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snd_out[i] = val;
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val = (snd_p[i+1]*snd_vol)>>8;
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if (val > 0x7fff)
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snd_out[i+1] = 0x7fff;
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else if (val < (short)0x8000)
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snd_out[i+1] = (short)0x8000;
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else
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snd_out[i+1] = val;
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}
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}
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#endif
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void S_TransferStereo16 (int endtime)
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{
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int lpos;
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int lpaintedtime;
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DWORD *pbuf;
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#ifdef _WIN32
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int reps;
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DWORD dwSize,dwSize2;
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DWORD *pbuf2;
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HRESULT hresult;
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#endif
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snd_vol = volume->value*256;
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snd_p = (int *) paintbuffer;
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lpaintedtime = paintedtime;
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#ifdef _WIN32
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if (pDSBuf)
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{
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reps = 0;
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while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize,
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&pbuf2, &dwSize2, 0)) != DS_OK)
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{
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if (hresult != DSERR_BUFFERLOST)
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{
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Con_Printf ("S_TransferStereo16: DS::Lock Sound Buffer Failed\n");
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S_Shutdown ();
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S_Startup ();
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return;
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}
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if (++reps > 10000)
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{
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Con_Printf ("S_TransferStereo16: DS: couldn't restore buffer\n");
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S_Shutdown ();
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S_Startup ();
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return;
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}
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}
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}
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else
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#endif
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{
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pbuf = (DWORD *)shm->buffer;
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}
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while (lpaintedtime < endtime)
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{
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// handle recirculating buffer issues
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lpos = lpaintedtime & ((shm->samples>>1)-1);
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snd_out = (short *) pbuf + (lpos<<1);
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snd_linear_count = (shm->samples>>1) - lpos;
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if (lpaintedtime + snd_linear_count > endtime)
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snd_linear_count = endtime - lpaintedtime;
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snd_linear_count <<= 1;
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// write a linear blast of samples
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Snd_WriteLinearBlastStereo16 ();
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snd_p += snd_linear_count;
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lpaintedtime += (snd_linear_count>>1);
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}
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#ifdef _WIN32
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if (pDSBuf)
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pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);
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#endif
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}
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void S_TransferPaintBuffer(int endtime)
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{
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int out_idx;
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int count;
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int out_mask;
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int *p;
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int step;
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int val;
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int snd_vol;
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DWORD *pbuf;
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#ifdef _WIN32
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int reps;
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DWORD dwSize,dwSize2;
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DWORD *pbuf2;
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HRESULT hresult;
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#endif
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if (shm->samplebits == 16 && shm->channels == 2)
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{
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S_TransferStereo16 (endtime);
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return;
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}
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p = (int *) paintbuffer;
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count = (endtime - paintedtime) * shm->channels;
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out_mask = shm->samples - 1;
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out_idx = paintedtime * shm->channels & out_mask;
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step = 3 - shm->channels;
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snd_vol = volume->value*256;
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#ifdef _WIN32
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if (pDSBuf)
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{
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reps = 0;
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while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize,
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&pbuf2,&dwSize2, 0)) != DS_OK)
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{
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if (hresult != DSERR_BUFFERLOST)
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{
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Con_Printf ("S_TransferPaintBuffer: DS::Lock Sound Buffer Failed\n");
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S_Shutdown ();
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S_Startup ();
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return;
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}
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if (++reps > 10000)
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{
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Con_Printf ("S_TransferPaintBuffer: DS: couldn't restore buffer\n");
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S_Shutdown ();
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S_Startup ();
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return;
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}
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}
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}
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else
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#endif
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{
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pbuf = (DWORD *)shm->buffer;
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}
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if (shm->samplebits == 16)
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{
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short *out = (short *) pbuf;
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while (count--)
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{
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val = (*p * snd_vol) >> 8;
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p+= step;
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if (val > 0x7fff)
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val = 0x7fff;
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else if (val < (short)0x8000)
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val = (short)0x8000;
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out[out_idx] = val;
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out_idx = (out_idx + 1) & out_mask;
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}
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}
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else if (shm->samplebits == 8)
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{
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unsigned char *out = (unsigned char *) pbuf;
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while (count--)
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{
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val = (*p * snd_vol) >> 8;
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p+= step;
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if (val > 0x7fff)
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val = 0x7fff;
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else if (val < (short)0x8000)
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val = (short)0x8000;
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out[out_idx] = (val>>8) + 128;
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out_idx = (out_idx + 1) & out_mask;
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}
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}
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#ifdef _WIN32
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if (pDSBuf) {
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DWORD dwNewpos, dwWrite;
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int il = paintedtime;
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int ir = endtime - paintedtime;
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ir += il;
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pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);
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pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &dwNewpos, &dwWrite);
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// if ((dwNewpos >= il) && (dwNewpos <= ir))
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// Con_Printf("%d-%d p %d c\n", il, ir, dwNewpos);
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}
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#endif
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}
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/*
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===============================================================================
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CHANNEL MIXING
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===============================================================================
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*/
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void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int endtime);
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void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int endtime);
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void S_PaintChannels(int endtime)
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{
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int i;
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int end;
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channel_t *ch;
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sfxcache_t *sc;
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int ltime, count;
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while (paintedtime < endtime)
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{
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// if paintbuffer is smaller than DMA buffer
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end = endtime;
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if (endtime - paintedtime > PAINTBUFFER_SIZE)
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end = paintedtime + PAINTBUFFER_SIZE;
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// clear the paint buffer
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memset(paintbuffer, 0, (end - paintedtime) * sizeof(portable_samplepair_t));
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// paint in the channels.
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ch = channels;
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for (i=0; i<total_channels ; i++, ch++)
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{
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if (!ch->sfx)
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continue;
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if (!ch->leftvol && !ch->rightvol)
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continue;
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sc = S_LoadSound (ch->sfx);
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if (!sc)
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continue;
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ltime = paintedtime;
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while (ltime < end)
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{ // paint up to end
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if (ch->end < end)
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count = ch->end - ltime;
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else
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count = end - ltime;
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if (count > 0)
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{
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if (sc->width == 1)
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SND_PaintChannelFrom8(ch, sc, count);
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else
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SND_PaintChannelFrom16(ch, sc, count);
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ltime += count;
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}
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// if at end of loop, restart
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if (ltime >= ch->end)
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{
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if (sc->loopstart >= 0)
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{
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ch->pos = sc->loopstart;
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ch->end = ltime + sc->length - ch->pos;
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}
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else
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{ // channel just stopped
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ch->sfx = NULL;
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break;
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}
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}
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}
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}
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// transfer out according to DMA format
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S_TransferPaintBuffer(end);
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paintedtime = end;
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}
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}
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void 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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#ifndef USE_INTEL_ASM
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void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int count)
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{
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int data;
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int *lscale, *rscale;
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unsigned char *sfx;
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int i;
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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 = (signed char *)sc->data + ch->pos;
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for (i=0 ; i<count ; i++)
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{
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data = sfx[i];
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paintbuffer[i].left += lscale[data];
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paintbuffer[i].right += rscale[data];
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}
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ch->pos += count;
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}
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#endif // USE_INTEL_ASM
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void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int count)
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{
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int data;
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int left, right;
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int leftvol, rightvol;
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signed short *sfx;
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int i;
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leftvol = ch->leftvol;
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rightvol = ch->rightvol;
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sfx = (signed short *)sc->data + ch->pos;
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for (i=0 ; i<count ; i++)
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{
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data = sfx[i];
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left = (data * leftvol) >> 8;
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right = (data * rightvol) >> 8;
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paintbuffer[i].left += left;
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paintbuffer[i].right += right;
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}
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ch->pos += count;
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}
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