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marssound.c
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marssound.c
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#include "doomdef.h"
#include "mars.h"
#include "mars_ringbuf.h"
#include "sounds.h"
#define MAX_SAMPLES 316 // 70Hz
//#define MAX_SAMPLES 440 // 50Hz
//#define MAX_SAMPLES 734 // 30Hz
#define SAMPLE_RATE 22050
#define SAMPLE_MIN 2
#define SAMPLE_MAX 1032
#define SAMPLE_CENTER (SAMPLE_MAX-SAMPLE_MIN)/2
#define SPATIALIZATION_RATE 15 // Hz
// this many samples between each spatialization call
#define SPATIALIZATION_SRATE (int)(MAX_SAMPLES*(((float)SAMPLE_RATE/MAX_SAMPLES)/SPATIALIZATION_RATE))
// when to clip out sounds
// Does not fit the large outdoor areas.
#define S_CLIPPING_DIST (1224 * FRACUNIT)
// Distance tp origin when sounds should be maxed out.
// This should relate to movement clipping resolution
// (see BLOCKMAP handling).
// In the source code release: (160*FRACUNIT). Changed back to the
// Vanilla value of 200 (why was this changed?)
#define S_CLOSE_DIST (200 * FRACUNIT)
// The range over which sound attenuates
#define S_ATTENUATOR (S_CLIPPING_DIST - S_CLOSE_DIST)
// Stereo separation
#define S_STEREO_SWING (96 * FRACUNIT)
// WAV
#define S_LE_SHORT(chunk) (((chunk)[0]>>8)|(((chunk)[0]&0xff) << 8))
#define S_LE_LONG(chunk) (S_LE_SHORT(chunk) | (S_LE_SHORT(chunk+1)<<16))
#define S_WAV_FORMAT_PCM 0x1
#define S_WAV_FORMAT_IMA_ADPCM 0x11
#define S_WAV_FORMAT_EXTENSIBLE 0xfffe
#define S_SEP_VOL_TO_MCD(sep,vol) do { if ((sep) > 254) (sep) = 254; (vol) <<= 2; /* 64 -> 256 max */ if ((vol) > 255) (vol) = 255; } while (0)
#define S_USE_MEGACD_DRV() (mcd_avail && (sfxdriver == sfxdriver_auto || sfxdriver == sfxdriver_mcd))
enum
{
SNDCMD_NONE,
SNDCMD_CLEAR,
SNDCMD_STARTSND,
SNDCMD_STARTORGSND
};
static uint8_t snd_bufidx = 0;
int16_t __attribute__((aligned(16))) snd_buffer[2][MAX_SAMPLES * 2];
static uint8_t snd_init = 0;
unsigned snd_nopaintcount = 0;
static VINT *vgm_tracks;
uint8_t *vgm_ptr;
sfxchannel_t pcmchannel;
int __attribute__((aligned(16))) pcm_data[4];
sfxchannel_t sfxchannels[SFXCHANNELS];
VINT sfxvolume = 64; /* range 0 - 64 */
VINT musicvolume = 64; /* range 0 - 64 */
VINT musictype = mustype_fm;
static VINT curmusic, muslooping = 0, curcdtrack = cdtrack_none;
int samplecount = 0;
static marsrb_t soundcmds = { 0 };
VINT sfxdriver = sfxdriver_auto, mcd_avail = 0; // 0 - auto, 2 - megacd, 2 - 32x
static sfxchannel_t *S_AllocateChannel(mobj_t* mobj, unsigned sound_id, int vol, getsoundpos_t getpos);
static void S_SetChannelData(sfxchannel_t* channel);
int S_PaintChannel4IMA(void* mixer, int16_t* buffer, int32_t cnt, int32_t scale) ATTR_DATA_CACHE_ALIGN;
int S_PaintChannel4IMA2x(void* mixer, int16_t* buffer, int32_t cnt, int32_t scale) ATTR_DATA_CACHE_ALIGN;
void S_PaintChannel8(void* mixer, int16_t* buffer, int32_t cnt, int32_t scale) ATTR_DATA_CACHE_ALIGN;
static int S_PaintChannel(sfxchannel_t *ch, int16_t* buffer, int painted) ATTR_DATA_CACHE_ALIGN;
static void S_StartSoundEx(mobj_t *mobj, int sound_id, getsoundpos_t getpos);
static void S_SpatializeAt(fixed_t*origin, mobj_t* listener, int* pvol, int* psep) ATTR_DATA_CACHE_ALIGN;
static void S_Spatialize(mobj_t* mobj, int* pvol, int* psep, getsoundpos_t getpos) ATTR_DATA_CACHE_ALIGN;
static void S_SpatializeAll(void) ATTR_DATA_CACHE_ALIGN;
static void S_Update(int16_t* buffer) ATTR_DATA_CACHE_ALIGN;
static void S_UpdatePCM(void) ATTR_DATA_CACHE_ALIGN;
static void S_Sec_DMA1Handler(void);
static void S_Pri_CmdHandler(void);
static void S_Sec_DMA1Handler(void);
/*
==================
=
= S_Init
=
==================
*/
void S_Init(void)
{
int i;
int initmusictype;
VINT tmp_tracks[100];
int start, end;
for (i = 0; i < SFXCHANNELS; i++)
sfxchannels[i].data = NULL;
// check if CD is available, reset the driver option if not
mcd_avail = S_CDAvailable() & 0x1;
if (!mcd_avail)
sfxdriver = sfxdriver_auto;
/* init sound effects */
start = W_CheckNumForName("DS_START");
end = W_CheckNumForName("DS_END");
if (start >= 0 && end > 0)
{
for (i=1 ; i < NUMSFX ; i++)
{
S_sfx[i].lump = W_CheckRangeForName(S_sfxnames[i], start, end);
}
}
else
{
for (i=1 ; i < NUMSFX ; i++)
{
S_sfx[i].lump = W_CheckNumForName(S_sfxnames[i]);
}
}
if (mcd_avail)
{
for (i=1 ; i < NUMSFX ; i++)
{
int lump = S_sfx[i].lump;
if (lump < 0) {
continue;
}
Mars_MCDLoadSfx(i, W_POINTLUMPNUM(lump), W_LumpLength(lump));
}
}
/* init music */
num_music = 0;
muslooping = 0;
S_StopSong();
for (i = 1; i < numlumps; i++)
{
char name[9];
D_memcpy(name, W_GetNameForNum(i), 8);
name[8] = 0;
if (D_strncasecmp("VGM_", name, 4))
continue;
tmp_tracks[num_music++] = i;
if (num_music == (int)sizeof(tmp_tracks) / sizeof(tmp_tracks[0]))
break;
}
if (num_music > 0)
{
vgm_tracks = Z_Malloc(sizeof(*vgm_tracks) * num_music, PU_STATIC);
for (i = 0; i < num_music; i++) {
vgm_tracks[i] = tmp_tracks[i];
}
}
Mars_RB_ResetAll(&soundcmds);
Mars_SetPriCmdCallback(&S_Pri_CmdHandler);
Mars_InitSoundDMA(1);
// FIXME: this is ugly, get rid of global variables!
// musictype is now set to value from SRAM.
// force proper initialization by resetting it to 'none',
// so that S_SetMusicType won't ignore the new value
initmusictype = musictype;
musictype = mustype_none;
S_SetMusicType(initmusictype);
}
/*
==================
=
= S_Clear
=
==================
*/
void S_Clear (void)
{
volatile int tic;
if (S_USE_MEGACD_DRV())
{
D_memset(sfxchannels, 0, sizeof(*sfxchannels) * SFXCHANNELS);
Mars_MCDClearSfx();
Mars_MCDFlushSfx();
return;
}
uint16_t *p = (uint16_t*)Mars_RB_GetWriteBuf(&soundcmds, 8, false);
if (!p)
return;
*p++ = SNDCMD_CLEAR;
Mars_RB_CommitWrite(&soundcmds);
/* do not wait the reader indefinitely */
/* a hack to get Gens KMod working */
for (tic = I_GetTime(); I_GetTime() < tic + 10; )
{
if (Mars_RB_Len(&soundcmds) == 0)
break;
}
}
void S_RestartSounds (void)
{
}
void S_SetSoundDriver (int newdrv)
{
S_Clear();
sfxdriver = newdrv;
switch (newdrv) {
case sfxdriver_pwm:
Mars_RB_ResetAll(&soundcmds);
Mars_InitSoundDMA(0);
break;
}
}
/*
==================
=
= S_SpatializeAt
=
==================
*/
static void S_SpatializeAt(fixed_t* origin, mobj_t* listener, int* pvol, int* psep)
{
int dist_approx;
int dx, dy;
angle_t angle;
int vol, sep;
dx = D_abs(origin[0] - listener->x);
dy = D_abs(origin[1] - listener->y);
dist_approx = dx + dy - ((dx < dy ? dx : dy) >> 1);
if (dist_approx > S_CLIPPING_DIST)
{
vol = 0;
sep = 128;
}
else
{
// angle of source to listener
angle = R_PointToAngle2(listener->x, listener->y,
origin[0], origin[1]);
if (angle > listener->angle)
angle = angle - listener->angle;
else
angle = angle + (0xffffffff - listener->angle);
angle >>= ANGLETOFINESHIFT;
sep = FixedMul(S_STEREO_SWING, finesine(angle));
sep >>= FRACBITS;
sep = 128 - sep;
if (sep < 0)
sep = 0;
else if (sep > 255)
sep = 255;
if (dist_approx < S_CLOSE_DIST)
vol = sfxvolume;
else if (dist_approx >= S_CLIPPING_DIST)
vol = 0;
else
{
vol = sfxvolume * (S_CLIPPING_DIST - dist_approx);
vol = (unsigned)vol / S_ATTENUATOR;
if (vol > sfxvolume)
vol = sfxvolume;
}
}
*pvol = vol;
*psep = sep;
}
/*
==================
=
= S_Spatialize
=
==================
*/
static void S_Spatialize(mobj_t* mobj, int *pvol, int *psep, getsoundpos_t getpos)
{
int vol, sep;
player_t* player = &players[consoleplayer];
player_t* player2 = &players[consoleplayer^1];
vol = sfxvolume;
sep = 128;
if (mobj)
{
fixed_t origin[2];
if (getpos)
{
getpos(mobj, origin);
}
else
{
origin[0] = mobj->x, origin[1] = mobj->y;
}
if (mobj != player->mo)
S_SpatializeAt(origin, player->mo, &vol, &sep);
if (splitscreen && player2->mo)
{
int vol2, sep2;
vol2 = sfxvolume;
sep2 = 255;
if (mobj != player2->mo)
S_SpatializeAt(origin, player2->mo, &vol2, &sep2);
sep = 128 + (vol2 - vol) * 2;
vol = vol2 > vol ? vol2 : vol;
if (sep < 0) sep = 0;
else if (sep > 255) sep = 255;
}
}
*pvol = vol;
*psep = sep;
}
/*
==================
=
= S_SpatializeAll
=
==================
*/
static void S_SpatializeAll(void)
{
int i;
mobj_t *mo;
for (i = 0; i < SFXCHANNELS; i++)
{
sfxchannel_t* ch = &sfxchannels[i];
if (!ch->data)
continue;
mo = ch->mobj;
if (mo)
{
int vol, sep;
/* */
/* spatialize */
/* */
if (!ch->getpos)
{
Mars_ClearCacheLine(&mo->x);
Mars_ClearCacheLine(&mo->y);
}
S_Spatialize(mo, &vol, &sep, ch->getpos);
if (!vol)
{
// inaudible
ch->data = NULL;
continue;
}
ch->volume = vol;
ch->pan = sep;
}
}
}
/*
==================
=
= S_StartSoundEx
=
==================
*/
static void S_StartSoundEx(mobj_t *mobj, int sound_id, getsoundpos_t getpos)
{
int vol, sep;
sfxinfo_t *sfx;
/* Get sound effect data pointer */
if (sound_id <= 0 || sound_id >= NUMSFX)
return;
sfx = &S_sfx[sound_id];
if (sfx->lump < 0)
return;
/* */
/* spatialize */
/* */
S_Spatialize(mobj, &vol, &sep, getpos);
if (!vol)
return; /* too far away */
// HACK: boost volume for item pickups
if (sound_id == sfx_itemup)
vol <<= 1;
if (S_USE_MEGACD_DRV())
{
sfxchannel_t *ch;
ch = S_AllocateChannel(mobj, sound_id, vol, getpos);
if (!ch)
return;
S_SEP_VOL_TO_MCD(sep, vol);
if (sound_id == sfx_itemup && sep == 128)
sep = 255; // full volume from both channels
Mars_MCDPlaySfx((ch - sfxchannels) + 1, sound_id, sep, vol);
return;
}
uint16_t* p = (uint16_t*)Mars_RB_GetWriteBuf(&soundcmds, 8, false);
if (!p)
return;
if (getpos)
{
*p++ = SNDCMD_STARTORGSND;
*p++ = sound_id;
*(int*)p = (intptr_t)mobj, p += 2;
*(int*)p = (intptr_t)getpos, p += 2;
*p++ = vol;
}
else
{
*p++ = SNDCMD_STARTSND;
*p++ = sound_id;
*(int*)p = (intptr_t)mobj, p += 2;
*p++ = vol;
}
Mars_RB_CommitWrite(&soundcmds);
}
void S_StartSound(mobj_t* mobj, int sound_id)
{
S_StartSoundEx(mobj, sound_id, NULL);
}
void S_StartPositionedSound(mobj_t* mobj, int sound_id, getsoundpos_t getpos)
{
S_StartSoundEx(mobj, sound_id, getpos);
}
/*
===================
=
= S_UpdateSounds
=
===================
*/
void S_PreUpdateSounds(void)
{
if (S_USE_MEGACD_DRV())
{
int i;
sfxchannel_t *ch;
int status, bit;
bit = 1;
status = Mars_MCDGetSfxPlaybackStatus();
for (ch = sfxchannels, i = 0; i < SFXCHANNELS; i++, ch++, bit <<= 1)
{
if (!ch->data)
continue;
if (!(status & bit)) {
// stopped
ch->data = NULL;
} else {
ch->position = 1;
}
}
}
}
void S_UpdateSounds(void)
{
static VINT oldmusvol = -1;
if (oldmusvol != musicvolume) {
if (S_CDAvailable()) {
int vol = musicvolume*4;
Mars_SetMusicVolume(vol > 255 ? 255 : vol);
}
oldmusvol = musicvolume;
}
if (S_USE_MEGACD_DRV())
{
int i;
sfxchannel_t *ch;
// spatalize
S_SpatializeAll();
for (ch = sfxchannels, i = 0; i < SFXCHANNELS; i++, ch++)
{
int vol, sep;
if (!ch->data)
continue;
sep = ch->pan;
vol = ch->volume;
S_SEP_VOL_TO_MCD(sep, vol);
Mars_MCDUpdateSfx(i + 1, sep, vol);
}
Mars_MCDFlushSfx();
}
}
void S_SetMusicType(int newtype)
{
int savemus, savecd;
if (newtype < mustype_none || newtype > mustype_cd)
return;
if (musictype == newtype)
return;
if (newtype == mustype_cd && !S_CDAvailable())
return;
// restart the current track
savemus = curmusic;
savecd = curcdtrack;
if (musictype != mustype_none)
S_StopSong();
curmusic = mus_none;
musictype = newtype;
curcdtrack = cdtrack_none;
S_StartSong(savemus, muslooping, savecd);
}
int S_CDAvailable(void)
{
/* recheck cd and get number of tracks */
Mars_UpdateCD();
return mars_cd_ok;
}
int S_SongForMapnum(int mapnum)
{
int i;
VINT songs[100];
VINT numsongs;
numsongs = 0;
for (i = 0; i < num_music; i++) {
VINT mus = vgm_tracks[i];
if (mus == gameinfo.titleMus)
continue;
if (mus == gameinfo.intermissionMus)
continue;
if (mus == gameinfo.victoryMus)
continue;
songs[numsongs++] = mus;
if (numsongs == sizeof(songs) / sizeof(songs[0]))
break;
}
if (numsongs == 0)
return mus_none;
return songs[(mapnum - 1) % numsongs];
}
void S_StartSong(int musiclump, int looping, int cdtrack)
{
int playtrack = 0;
if (musictype == mustype_cd)
{
if (cdtrack == cdtrack_none)
{
S_StopSong();
return;
}
if (S_CDAvailable())
{
int num_map_tracks = (int)mars_num_cd_tracks + cdtrack_lastmap;
/* there is a disc with at least enough tracks */
if (cdtrack <= cdtrack_title)
playtrack = cdtrack + mars_num_cd_tracks;
else if (num_map_tracks > 0)
playtrack = 1 + (cdtrack - 1) % num_map_tracks;
else
playtrack = cdtrack_intermission + mars_num_cd_tracks;
}
if (playtrack < 0)
return;
if (curcdtrack == cdtrack && muslooping == looping)
return;
}
else if (musictype == mustype_fm)
{
int i;
for (i = 0; i < num_music; i++)
{
if (vgm_tracks[i] == musiclump)
{
playtrack = i + 1;
break;
}
}
if (musiclump == mus_none || playtrack == 0)
{
S_StopSong();
return;
}
if (curmusic == musiclump && muslooping == looping)
return;
}
curmusic = musiclump;
curcdtrack = cdtrack;
muslooping = looping;
if (musictype == mustype_none)
return;
if (musictype == mustype_cd)
{
Mars_PlayTrack(1, playtrack, NULL, 0, looping);
return;
}
Mars_StopTrack(); // stop the playback before flipping pages
S_Clear();
vgm_ptr = (uint8_t *)W_POINTLUMPNUM(musiclump);
Mars_PlayTrack(0, playtrack, vgm_ptr, W_LumpLength(musiclump), looping);
}
void S_StopSong(void)
{
Mars_StopTrack();
curmusic = mus_none;
curcdtrack = cdtrack_none;
}
static void S_ClearPCM(void)
{
D_memset(pcm_data, 0, sizeof(pcm_data));
D_memset(&pcmchannel, 0, sizeof(pcmchannel));
pcmchannel.volume = /*musicvolume*/40; /* 64 seems to be too loud */
pcmchannel.pan = 128;
}
static void S_UpdatePCM(void)
{
int inc, len, offs, flag;
Mars_ClearCacheLine(pcm_data);
inc = pcm_data[0]; /* cache read line loads all vars at once to cache */
len = pcm_data[1];
offs = pcm_data[2];
flag = pcm_data[3];
if (flag & 1)
{
if (offs == -1)
{
pcmchannel.data = NULL;
((volatile short *)pcm_data)[7] = 0; // unset bit 0 for flag
return;
}
/* do once */
pcmchannel.position = 0;
pcmchannel.increment = inc;
pcmchannel.length = len;
pcmchannel.data = vgm_ptr + offs;
((volatile short *)pcm_data)[7] = 0; // unset bit 0 for flag
}
}
static int S_PaintChannel(sfxchannel_t *ch, int16_t* buffer, int painted)
{
if (!ch->data)
return 0;
if (ch->width == 4)
{
int i = MAX_SAMPLES;
int32_t *end = (int32_t *)buffer + MAX_SAMPLES;
int (*paintch)(void* mixer, int16_t* buffer, int32_t cnt, int32_t scale);
// general mixing routine
paintch = S_PaintChannel4IMA;
if ((ch->increment < (1 << 14)) && !(ch->increment & (ch->increment-1))) {
// optimized 2x upsampling mixer: from 11kHz to 22kHz or 44kHz
paintch = S_PaintChannel4IMA2x;
}
do
{
if (ch->position >= ch->length)
{
// advance to next block
ch->data += ch->block_size-3;
ch->length = 0;
}
if (!ch->length)
{
uint8_t *block = (uint8_t *)ch->data;
int block_size = ch->block_size;
if (block_size > ch->remaining_bytes)
block_size = ch->remaining_bytes;
if (block_size < 4)
{
// EOF
ch->data = NULL;
break;
}
ch->position = 1 << 14;
ch->prev_pos = -1; // force output of initial predictor
ch->length = ((block_size-3) << 1) << 14;
// initial step_index : initial predictor
ch->loop_length = (((unsigned)block[2]*2) << 16) | ((unsigned)block[1] << 8) | block[0];
ch->data += 3;
ch->remaining_bytes -= block_size;
}
i = paintch(ch, (int16_t *)(end - i), i, 64);
} while (i > 0);
painted = MAX_SAMPLES - i;
}
else
{
S_PaintChannel8(ch, buffer, MAX_SAMPLES, 64);
if (ch->position >= ch->length)
{
ch->data = NULL;
}
painted = MAX_SAMPLES;
}
return painted;
}
static void S_Update(int16_t* buffer)
{
int i;
int32_t *b2;
int c, l, h;
mobj_t* mo;
int painted = 0;
S_UpdatePCM();
Mars_ClearCacheLine(&sfxvolume);
Mars_ClearCacheLine(&musicvolume);
Mars_ClearCacheLine(&sfxdriver);
if (pcmchannel.data)
{
snd_nopaintcount = 0;
}
else
{
if (S_USE_MEGACD_DRV())
{
snd_nopaintcount++;
}
else
{
for (i = 0; i < SFXCHANNELS; i++)
{
if (sfxchannels[i].data)
break;
}
if (i == SFXCHANNELS)
snd_nopaintcount++;
else
snd_nopaintcount = 0;
}
}
if (snd_nopaintcount > 2)
{
// we haven't painted the sound channels to the output buffer
// for over two frames, both buffers are cleared and safe to
// point the DMA to
return;
}
b2 = (int32_t *)buffer;
for (i = 0; i < MAX_SAMPLES; i++)
{
*b2++ = 0;
}
/* keep updating the channel until done */
painted += S_PaintChannel(&pcmchannel, buffer, painted);
if (!S_USE_MEGACD_DRV())
{
boolean spatialize = samplecount >= SPATIALIZATION_SRATE;
if (spatialize)
{
for (i = 0; i < MAXPLAYERS; i++)
{
player_t* player = &players[i];
if (!playeringame[i])
continue;
Mars_ClearCacheLine(&player->mo);
mo = player->mo;
Mars_ClearCacheLine(&mo->x);
Mars_ClearCacheLine(&mo->y);
Mars_ClearCacheLine(&mo->angle);
}
S_SpatializeAll();
}
for (i = 0; i < SFXCHANNELS; i++)
{
sfxchannel_t* ch = &sfxchannels[i];
if (!ch->data)
continue;
painted += S_PaintChannel(ch, buffer, painted);
}
}
if (samplecount >= SPATIALIZATION_SRATE)
samplecount -= SPATIALIZATION_SRATE;
samplecount += MAX_SAMPLES;
#ifdef MARS
// force GCC into keeping constants in registers as it
// is stupid enough to reload them on each loop iteration
__asm volatile("mov %1,%0\n\t" : "=&r" (c) : "r"(SAMPLE_CENTER));
__asm volatile("mov %1,%0\n\t" : "=&r" (l) : "r"(SAMPLE_MIN));
__asm volatile("mov %1,%0\n\t" : "=&r" (h) : "r"(SAMPLE_MAX));
#else
c = SAMPLE_CENTER, l = SAMPLE_MIN, h = SAMPLE_MAX;
#endif
// convert buffer from s16 pcm samples to u16 pwm samples
b2 = (int32_t *)buffer;
for (i = 0; i < MAX_SAMPLES; i++)
{
int s, s1, s2;
s = (int16_t)(*b2 >> 16) + c;
s1 = (s < l) ? l : (s > h) ? h : s;
s = (int16_t)(*b2 ) + c;
s2 = (s < l) ? l : (s > h) ? h : s;
*b2++ = (s1 << 16) | s2;
}
}
static void S_Sec_DMA1Handler(void)
{
Mars_ClearCacheLine(&sfxdriver);
if (snd_nopaintcount > 2 && S_USE_MEGACD_DRV())
{
snd_init = 0;
Mars_RB_ResetRead(&soundcmds);
return;
}
// start DMA on buffer and fill the other one
SH2_DMA_SAR1 = (uintptr_t)snd_buffer[snd_bufidx];
SH2_DMA_TCR1 = MAX_SAMPLES; // number longs
SH2_DMA_CHCR1 = 0x18E5; // dest fixed, src incr, size long, ext req, dack mem to dev, dack hi, dack edge, dreq rising edge, cycle-steal, dual addr, intr enabled, clear TE, dma enabled
snd_bufidx ^= 1; // flip audio buffer
Mars_Sec_ReadSoundCmds();
S_Update(snd_buffer[snd_bufidx]);
}
/*
==================
=
= S_AllocateChannel
=
==================
*/
static sfxchannel_t *S_AllocateChannel(mobj_t* mobj, unsigned sound_id, int vol, getsoundpos_t getpos)
{
sfxchannel_t* channel, * newchannel;
int i;
int length;
sfxinfo_t* sfx;
sfx_t* md_data;
newchannel = NULL;
sfx = &S_sfx[sound_id];
md_data = W_POINTLUMPNUM(sfx->lump);
length = md_data->samples;
if (length < 4)
return NULL;
/* reject sounds started at the same instant and singular sounds */
for (channel = sfxchannels, i = 0; i < SFXCHANNELS; i++, channel++)
{
if (channel->sfx == sfx)
{
if (channel->position <= 0) /* ADPCM has the position set to -1 initially */
{
if (channel->volume < vol)
{
newchannel = channel;
goto gotchannel; /* overlay this */
}
return NULL; /* exact sound already started */
}
if (sfx->singularity)
{
newchannel = channel; /* overlay this */
goto gotchannel;
}
}
if (mobj && channel->mobj == mobj)
{ /* cut off whatever was coming from this origin */
newchannel = channel;
goto gotchannel;
}