328 lines
7.5 KiB
C
328 lines
7.5 KiB
C
/*
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Copyright (C) 1997-2001 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 the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// snd_mix.c -- portable code to mix sounds for snd_dma.c
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#include "sound.h"
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#define PAINTBUFFER_SIZE 2048
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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 S_WriteLinearBlastStereo16( void )
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{
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int i, 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]>>8;
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if( val > 0x7fff ) 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 snd_out[i] = val;
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val = snd_p[i+1]>>8;
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if( val > 0x7fff ) 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 snd_out[i+1] = val;
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}
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}
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void S_TransferStereo16( dword *pbuf, int endtime )
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{
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int lpos, lpaintedtime;
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snd_p = (int *)paintbuffer;
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lpaintedtime = paintedtime;
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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 & ((dma.samples >> 1) - 1);
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snd_out = (short *) pbuf + (lpos << 1);
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snd_linear_count = (dma.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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S_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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}
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/*
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===================
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S_TransferPaintBuffer
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===================
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*/
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void S_TransferPaintBuffer( int endtime )
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{
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int out_idx, count;
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int step, val;
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int *p, out_mask;
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dword *pbuf;
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pbuf = (dword *)dma.buffer;
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if( s_testsound->integer )
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{
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int i, count;
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// write a fixed sine wave
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count = (endtime - paintedtime);
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for( i = 0; i < count; i++ )
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{
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paintbuffer[i].left = com.sin(( paintedtime + i ) * 0.1f ) * 20000 * 256;
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paintbuffer[i].right = paintbuffer[i].left;
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}
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}
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if( dma.samplebits == 16 && dma.channels == 2 )
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{
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// optimized case
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S_TransferStereo16( pbuf, endtime );
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}
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else
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{
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// general case
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p = (int *)paintbuffer;
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count = (endtime - paintedtime) * dma.channels;
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out_mask = dma.samples - 1;
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out_idx = paintedtime * dma.channels & out_mask;
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step = 3 - dma.channels;
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if( dma.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 >> 8;
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p += step;
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if( val > 0x7fff ) 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( dma.samplebits == 8 )
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{
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byte *out = (byte *)pbuf;
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while( count-- )
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{
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val = *p >> 8;
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p += step;
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if( val > 0x7fff ) 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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}
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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 S_PaintChannelFrom8( channel_t *ch, sfxcache_t *sc, int count, int offset )
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{
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int data;
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int *lscale, *rscale;
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byte *sfx;
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portable_samplepair_t *samp;
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int i;
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if( ch->leftvol > 255 ) ch->leftvol = 255;
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if( ch->rightvol > 255 ) 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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samp = &paintbuffer[offset];
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for( i = 0; i < count; i++, samp++ )
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{
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data = sfx[i];
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samp->left += lscale[data];
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samp->right += rscale[data];
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}
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ch->pos += count;
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}
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void S_PaintChannelFrom16( channel_t *ch, sfxcache_t *sc, int count, int offset )
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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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portable_samplepair_t *samp;
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int i;
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leftvol = ch->leftvol * snd_vol;
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rightvol = ch->rightvol * snd_vol;
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sfx = (signed short *)sc->data + ch->pos;
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samp = &paintbuffer[offset];
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for( i = 0; i < count; i++, samp++ )
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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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samp->left += left;
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samp->right += right;
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}
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ch->pos += count;
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}
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void S_PaintChannels( int endtime )
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{
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channel_t *ch;
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sfxcache_t *sc;
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playsound_t *ps;
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int i, end, ltime, count;
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snd_vol = s_volume->value * 256;
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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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// start any playsounds
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while( 1 )
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{
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ps = s_pendingplays.next;
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if( ps == &s_pendingplays )
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break; // no more pending sounds
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if( ps->begin <= paintedtime )
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{
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S_IssuePlaysound( ps );
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continue;
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}
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if( ps->begin < end ) end = ps->begin; // stop here
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break;
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}
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// clear the paint buffer
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if( s_rawend < paintedtime )
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{
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Mem_Set( paintbuffer, 0, (end - paintedtime) * sizeof( portable_samplepair_t ));
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}
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else
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{
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int stop;
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// copy from the streaming sound source
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stop = (end < s_rawend) ? end : s_rawend;
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for( i = paintedtime; i < stop; i++ )
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paintbuffer[i - paintedtime] = s_rawsamples[i & (MAX_RAW_SAMPLES - 1)];
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for( ; i < end; i++ )
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paintbuffer[i-paintedtime].left = paintbuffer[i-paintedtime].right = 0;
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}
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// paint in the channels.
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for( i = 0, ch = channels; i < MAX_CHANNELS; i++, ch++ )
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{
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ltime = paintedtime;
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while( ltime < end )
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{
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if( !ch->sfx || ( !ch->leftvol && !ch->rightvol ))
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break;
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// max painting is to the end of the buffer
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count = end - ltime;
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// might be stopped by running out of data
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if( ch->end - ltime < count ) count = ch->end - ltime;
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sc = S_LoadSound( ch->sfx );
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if( !sc ) break;
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if( count > 0 && ch->sfx )
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{
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if( sc->width == 1 )
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S_PaintChannelFrom8( ch, sc, count, ltime - paintedtime );
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else S_PaintChannelFrom16( ch, sc, count, ltime - paintedtime );
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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( ch->autosound && ch->use_loop )
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{ // autolooping sounds always go back to start
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ch->pos = 0;
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ch->end = ltime + sc->length;
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}
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else if( sc->loopstart >= 0 && ch->use_loop )
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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 ch->sfx = NULL; // channel just stopped
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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 S_InitScaletable( void )
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{
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int i, j;
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int scale;
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for( i = 0; i < 32; i++ )
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{
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scale = i * 8 * 256 * s_volume->value;
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for( j = 0; j < 256; j++ ) snd_scaletable[i][j] = ((signed char)j) * scale;
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}
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s_volume->modified = false;
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}
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