mirror of
https://github.com/Shpoike/Quakespasm.git
synced 2024-11-10 07:21:58 +00:00
292 lines
6.4 KiB
C
292 lines
6.4 KiB
C
/*
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Copyright (C) 1996-2001 Id Software, Inc.
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Copyright (C) 2002-2009 John Fitzgibbons and others
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Copyright (C) 2007-2008 Kristian Duske
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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 "quakedef.h"
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#define PAINTBUFFER_SIZE 512
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/**
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* The paintbuffer is an array of struct { int left, int right } 's.
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* The int's are signed 24-bit samples which will be truncated to
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* signed 16-bit before output.
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*/
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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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{
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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]>>8;
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if (val > 32767)
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snd_out[i] = 32767;
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else if (val < -32768)
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snd_out[i] = -32768;
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else
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snd_out[i] = val;
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val = snd_p[i+1]>>8;
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if (val > 32767)
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snd_out[i+1] = 32767;
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else if (val < -32768)
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snd_out[i+1] = -32768;
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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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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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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 & ((shm->samples >> 1) - 1);
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snd_out = (short *)shm->buffer + (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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}
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void S_TransferPaintBuffer(int endtime)
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{
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int out_idx, out_mask;
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int count, step, val;
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int *p;
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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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if (shm->samplebits == 16)
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{
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short *out = (short *)shm->buffer;
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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)
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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 = shm->buffer;
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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)
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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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}
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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, ltime, count;
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int stream;
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channel_t *ch;
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sfxcache_t *sc;
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snd_vol = sfxvolume.value * 255;
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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 and mix any raw samples... (e.g. OGG music)
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memset(paintbuffer, 0, sizeof(paintbuffer));
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for (stream = 0; stream < MAX_RAW_STREAMS; stream++) {
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if ( s_rawend[stream] >= paintedtime ) {
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// copy from the streaming sound source
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const portable_samplepair_t *rawsamples = s_rawsamples[stream];
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const int stop = (end < s_rawend[stream]) ? end : s_rawend[stream];
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for ( i = paintedtime ; i < stop ; i++ ) {
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const int s = i&(MAX_RAW_SAMPLES-1);
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paintbuffer[i-paintedtime].left += rawsamples[s].left;
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paintbuffer[i-paintedtime].right += rawsamples[s].right;
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}
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}
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}
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// paint in the sfx channels.
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ch = snd_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_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int count)
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{
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int data;
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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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sfx = (unsigned char *) ((unsigned 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] - 128) * snd_vol;
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paintbuffer[i].left += data * ch->leftvol;
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paintbuffer[i].right += data * ch->rightvol;
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}
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ch->pos += count;
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}
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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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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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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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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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