snd_dma.c

来自「quake1 dos源代码最新版本」· C语言 代码 · 共 1,059 行 · 第 1/2 页

/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// snd_dma.c -- main control for any streaming sound output device

#include "quakedef.h"

#ifdef _WIN32
#include "winquake.h"
#endif

void S_Play(void);
void S_PlayVol(void);
void S_SoundList(void);
void S_Update_();
void S_StopAllSounds(qboolean clear);
void S_StopAllSoundsC(void);

// =======================================================================
// Internal sound data & structures
// =======================================================================

channel_t   channels[MAX_CHANNELS];
int			total_channels;

int				snd_blocked = 0;
static qboolean	snd_ambient = 1;
qboolean		snd_initialized = false;

// pointer should go away
volatile dma_t  *shm = 0;
volatile dma_t sn;

vec3_t		listener_origin;
vec3_t		listener_forward;
vec3_t		listener_right;
vec3_t		listener_up;
vec_t		sound_nominal_clip_dist=1000.0;

int			soundtime;		// sample PAIRS
int   		paintedtime; 	// sample PAIRS


#define	MAX_SFX		512
sfx_t		*known_sfx;		// hunk allocated [MAX_SFX]
int			num_sfx;

sfx_t		*ambient_sfx[NUM_AMBIENTS];

int 		desired_speed = 11025;
int 		desired_bits = 16;

int sound_started=0;

cvar_t	*bgmvolume;
cvar_t	*volume;

cvar_t	*nosound;
cvar_t	*precache;
cvar_t	*loadas8bit;
cvar_t	*bgmbuffer;
cvar_t	*ambient_level;
cvar_t	*ambient_fade;
cvar_t	*snd_noextraupdate;
cvar_t	*snd_show;
cvar_t	*_snd_mixahead;


// ====================================================================
// User-setable variables
// ====================================================================


//
// Fake dma is a synchronous faking of the DMA progress used for
// isolating performance in the renderer.  The fakedma_updates is
// number of times S_Update() is called per second.
//

qboolean fakedma = false;
int fakedma_updates = 15;


void S_AmbientOff (void)
{
	snd_ambient = false;
}


void S_AmbientOn (void)
{
	snd_ambient = true;
}


void S_SoundInfo_f(void)
{
	if (!sound_started || !shm)
	{
		Con_Printf ("sound system not started\n");
		return;
	}

	Con_Printf("%5d stereo\n", shm->channels - 1);
	Con_Printf("%5d samples\n", shm->samples);
	Con_Printf("%5d samplepos\n", shm->samplepos);
	Con_Printf("%5d samplebits\n", shm->samplebits);
	Con_Printf("%5d submission_chunk\n", shm->submission_chunk);
	Con_Printf("%5d speed\n", shm->speed);
	Con_Printf("0x%x dma buffer\n", shm->buffer);
	Con_Printf("%5d total_channels\n", total_channels);
}


/*
================
S_Startup
================
*/

void S_Startup (void)
{
	int		rc;

	if (!snd_initialized)
		return;

	if (!fakedma)
	{
		rc = SNDDMA_Init();

		if (!rc)
		{
#ifndef	_WIN32
			Con_Printf("S_Startup: SNDDMA_Init failed.\n");
#endif
			sound_started = 0;
			return;
		}
	}

	sound_started = 1;
}

// 2001-09-18 New cvar system by Maddes (Init)  start
/*
================
S_Init_Cvars
================
*/
void S_Init_Cvars (void)
{
	nosound = Cvar_Get ("nosound", "0", CVAR_ORIGINAL);
	volume = Cvar_Get ("volume", "0.7", CVAR_ARCHIVE|CVAR_ORIGINAL);
	precache = Cvar_Get ("precache", "1", CVAR_ORIGINAL);
	loadas8bit = Cvar_Get ("loadas8bit", "0", CVAR_ORIGINAL);
	bgmvolume = Cvar_Get ("bgmvolume", "1", CVAR_ARCHIVE|CVAR_ORIGINAL);
	bgmbuffer = Cvar_Get ("bgmbuffer", "4096", CVAR_ORIGINAL);
	ambient_level = Cvar_Get ("ambient_level", "0.3", CVAR_ORIGINAL);
	ambient_fade = Cvar_Get ("ambient_fade", "100", CVAR_ORIGINAL);
	snd_noextraupdate = Cvar_Get ("snd_noextraupdate", "0", CVAR_ORIGINAL);
	snd_show = Cvar_Get ("snd_show", "0", CVAR_ORIGINAL);
	_snd_mixahead = Cvar_Get ("_snd_mixahead", "0.1", CVAR_ARCHIVE|CVAR_ORIGINAL);

	if (host_parms.memsize < 0x800000)
	{
		Cvar_Set (loadas8bit, "1");
		Con_Printf ("loading all sounds as 8bit\n");
	}
}
// 2001-09-18 New cvar system by Maddes (Init)  end

/*
================
S_Init
================
*/
void S_Init (void)
{

	Con_Printf("\nSound Initialization\n");

	if (COM_CheckParm("-nosound"))
		return;

	if (COM_CheckParm("-simsound"))
		fakedma = true;

	Cmd_AddCommand("play", S_Play);
	Cmd_AddCommand("playvol", S_PlayVol);
	Cmd_AddCommand("stopsound", S_StopAllSoundsC);
	Cmd_AddCommand("soundlist", S_SoundList);
	Cmd_AddCommand("soundinfo", S_SoundInfo_f);

// 2001-09-18 New cvar system by Maddes (Init)  start
/*
	nosound = Cvar_Get ("nosound", "0", CVAR_ORIGINAL);
	volume = Cvar_Get ("volume", "0.7", CVAR_ARCHIVE|CVAR_ORIGINAL);
	precache = Cvar_Get ("precache", "1", CVAR_ORIGINAL);
	loadas8bit = Cvar_Get ("loadas8bit", "0", CVAR_ORIGINAL);
	bgmvolume = Cvar_Get ("bgmvolume", "1", CVAR_ARCHIVE|CVAR_ORIGINAL);
	bgmbuffer = Cvar_Get ("bgmbuffer", "4096", CVAR_ORIGINAL);
	ambient_level = Cvar_Get ("ambient_level", "0.3", CVAR_ORIGINAL);
	ambient_fade = Cvar_Get ("ambient_fade", "100", CVAR_ORIGINAL);
	snd_noextraupdate = Cvar_Get ("snd_noextraupdate", "0", CVAR_ORIGINAL);
	snd_show = Cvar_Get ("snd_show", "0", CVAR_ORIGINAL);
	_snd_mixahead = Cvar_Get ("_snd_mixahead", "0.1", CVAR_ARCHIVE|CVAR_ORIGINAL);

	if (host_parms.memsize < 0x800000)
	{
		Cvar_Set (loadas8bit, "1");
		Con_Printf ("loading all sounds as 8bit\n");
	}
*/
// 2001-09-18 New cvar system by Maddes (Init)  end

	snd_initialized = true;

	S_Startup ();

	SND_InitScaletable ();

	known_sfx = Hunk_AllocName (MAX_SFX*sizeof(sfx_t), "sfx_t");
	num_sfx = 0;

// create a piece of DMA memory

	if (fakedma)
	{
		shm = (void *) Hunk_AllocName(sizeof(*shm), "shm");
		shm->splitbuffer = 0;
		shm->samplebits = 16;
		shm->speed = 22050;
		shm->channels = 2;
		shm->samples = 32768;
		shm->samplepos = 0;
		shm->soundalive = true;
		shm->gamealive = true;
		shm->submission_chunk = 1;
		shm->buffer = Hunk_AllocName(1<<16, "shmbuf");
	}

	if (shm)	// 2000-07-09 GPF when GUS or BLASTER variable not set fix by Maddes/Raymond Martineau
		Con_Printf ("Sound sampling rate: %i\n", shm->speed);

	// provides a tick sound until washed clean

//	if (shm->buffer)
//		shm->buffer[4] = shm->buffer[5] = 0x7f;	// force a pop for debugging

	ambient_sfx[AMBIENT_WATER] = S_PrecacheSound ("ambience/water1.wav");
	ambient_sfx[AMBIENT_SKY] = S_PrecacheSound ("ambience/wind2.wav");

	S_StopAllSounds (true);
}


// =======================================================================
// Shutdown sound engine
// =======================================================================

void S_Shutdown(void)
{

	if (!sound_started)
		return;

	if (shm)
		shm->gamealive = 0;

	shm = 0;
	sound_started = 0;

	if (!fakedma)
	{
		SNDDMA_Shutdown();
	}
}


// =======================================================================
// Load a sound
// =======================================================================

/*
==================
S_FindName

==================
*/
sfx_t *S_FindName (char *name)
{
	int		i;
	sfx_t	*sfx;

	if (!name)
		Sys_Error ("S_FindName: NULL\n");

	if (strlen(name) >= MAX_QPATH)
		Sys_Error ("Sound name too long: %s", name);

// see if already loaded
	for (i=0 ; i < num_sfx ; i++)
		if (!strcmp(known_sfx[i].name, name))
		{
			return &known_sfx[i];
		}

	if (num_sfx == MAX_SFX)
		Sys_Error ("S_FindName: out of sfx_t");

	sfx = &known_sfx[i];
	strcpy (sfx->name, name);

	num_sfx++;

	return sfx;
}


/*
==================
S_TouchSound

==================
*/
void S_TouchSound (char *name)
{
	sfx_t	*sfx;

	if (!sound_started)
		return;

	sfx = S_FindName (name);
	Cache_Check (&sfx->cache);
}

/*
==================
S_PrecacheSound

==================
*/
sfx_t *S_PrecacheSound (char *name)
{
	sfx_t	*sfx;

	if (!sound_started || nosound->value)
		return NULL;

	sfx = S_FindName (name);

// cache it in
	if (precache->value)
		S_LoadSound (sfx);

	return sfx;
}


//=============================================================================

/*
=================
SND_PickChannel
=================
*/
channel_t *SND_PickChannel(int entnum, int entchannel)
{
    int ch_idx;
    int first_to_die;
    int life_left;

// Check for replacement sound, or find the best one to replace
    first_to_die = -1;
    life_left = 0x7fffffff;
    for (ch_idx=NUM_AMBIENTS ; ch_idx < NUM_AMBIENTS + MAX_DYNAMIC_CHANNELS ; ch_idx++)
    {
		if (entchannel != 0		// channel 0 never overrides
		&& channels[ch_idx].entnum == entnum
		&& (channels[ch_idx].entchannel == entchannel || entchannel == -1) )
		{	// always override sound from same entity
			first_to_die = ch_idx;
			break;
		}

		// don't let monster sounds override player sounds
		if (channels[ch_idx].entnum == cl.viewentity && entnum != cl.viewentity && channels[ch_idx].sfx)
			continue;

		if (channels[ch_idx].end - paintedtime < life_left)
		{
			life_left = channels[ch_idx].end - paintedtime;
			first_to_die = ch_idx;
		}
   }

	if (first_to_die == -1)
		return NULL;

	if (channels[first_to_die].sfx)
		channels[first_to_die].sfx = NULL;

    return &channels[first_to_die];
}

/*
=================
SND_Spatialize
=================
*/
void SND_Spatialize(channel_t *ch)
{
	vec_t dot;
// 2000-07-30 DJGPP compiler warning fix by Norberto Alfredo Bensa  start
//	vec_t ldist, rdist, dist;
	vec_t dist;
// 2000-07-30 DJGPP compiler warning fix by Norberto Alfredo Bensa  end
	vec_t lscale, rscale, scale;
	vec3_t source_vec;
//	sfx_t *snd;	// 2001-12-10 Reduced compiler warnings by Jeff Ford

// anything coming from the view entity will always be full volume
	if (ch->entnum == cl.viewentity)
	{
		ch->leftvol = ch->master_vol;
		ch->rightvol = ch->master_vol;
		return;
	}

// calculate stereo seperation and distance attenuation

//	snd = ch->sfx;	// 2001-12-10 Reduced compiler warnings by Jeff Ford
	VectorSubtract(ch->origin, listener_origin, source_vec);

	dist = VectorNormalize(source_vec) * ch->dist_mult;

	dot = DotProduct(listener_right, source_vec);

	if (shm->channels == 1)
	{
		rscale = 1.0;
		lscale = 1.0;
	}
	else
	{
		rscale = 1.0 + dot;
		lscale = 1.0 - dot;
	}

// add in distance effect
	scale = (1.0 - dist) * rscale;
	ch->rightvol = (int) (ch->master_vol * scale);
	if (ch->rightvol < 0)
		ch->rightvol = 0;

	scale = (1.0 - dist) * lscale;
	ch->leftvol = (int) (ch->master_vol * scale);
	if (ch->leftvol < 0)
		ch->leftvol = 0;
}


// =======================================================================
// Start a sound effect
// =======================================================================

void S_StartSound(int entnum, int entchannel, sfx_t *sfx, vec3_t origin, float fvol, float attenuation)
{
	channel_t *target_chan, *check;
	sfxcache_t	*sc;
	int		vol;
	int		ch_idx;
	int		skip;

	if (!sound_started)
		return;

	if (!sfx)
		return;

	if (nosound->value)
		return;

	vol = fvol*255;

// pick a channel to play on
	target_chan = SND_PickChannel(entnum, entchannel);
	if (!target_chan)
		return;

// spatialize
	memset (target_chan, 0, sizeof(*target_chan));
	VectorCopy(origin, target_chan->origin);
	target_chan->dist_mult = attenuation / sound_nominal_clip_dist;
	target_chan->master_vol = vol;
	target_chan->entnum = entnum;
	target_chan->entchannel = entchannel;
	SND_Spatialize(target_chan);

	if (!target_chan->leftvol && !target_chan->rightvol)
		return;		// not audible at all

// new channel
	sc = S_LoadSound (sfx);
	if (!sc)
	{
		target_chan->sfx = NULL;
		return;		// couldn't load the sound's data
	}

	target_chan->sfx = sfx;
	target_chan->pos = 0.0;
    target_chan->end = paintedtime + sc->length;