Xash3DArchive/engine/snd_win.c

/*
Copyright (C) 1997-2001 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.

*/

#include <windows.h>
#include <dsound.h>
#include "engine.h"
#include "client.h"
#include "snd_loc.h"

#define iDirectSoundCreate(a,b,c)	pDirectSoundCreate(a,b,c)

extern HWND cl_hwnd;
HRESULT (WINAPI *pDirectSoundCreate)(GUID FAR *lpGUID, LPDIRECTSOUND FAR *lplpDS, IUnknown FAR *pUnkOuter);

// 64K is > 1 second at 16-bit, 22050 Hz
#define	WAV_BUFFERS				64
#define	WAV_MASK				0x3F
#define	WAV_BUFFER_SIZE			0x0400
#define SECONDARY_BUFFER_SIZE	0x10000

typedef enum {SIS_SUCCESS, SIS_FAILURE, SIS_NOTAVAIL} sndinitstat;

cvar_t	*s_wavonly;

static bool	dsound_init;
static bool	wav_init;
static bool	snd_firsttime = true, snd_isdirect, snd_iswave;
static bool	primary_format_set;

// starts at 0 for disabled
static int	snd_buffer_count = 0;
static int	sample16;
static int	snd_sent, snd_completed;

/* 
 * Global variables. Must be visible to window-procedure function 
 *  so it can unlock and free the data block after it has been played. 
 */ 


HANDLE		hData;
HPSTR		lpData, lpData2;

HGLOBAL		hWaveHdr;
LPWAVEHDR	lpWaveHdr;

HWAVEOUT    hWaveOut; 

WAVEOUTCAPS	wavecaps;

DWORD	gSndBufSize;

MMTIME		mmstarttime;

LPDIRECTSOUND pDS;
LPDIRECTSOUNDBUFFER pDSBuf, pDSPBuf;

HINSTANCE hInstDS;

bool SNDDMA_InitDirect (void);
bool SNDDMA_InitWav (void);

void FreeSound( void );

static const char *DSoundError( int error )
{
	switch ( error )
	{
	case DSERR_BUFFERLOST:
		return "DSERR_BUFFERLOST";
	case DSERR_INVALIDCALL:
		return "DSERR_INVALIDCALLS";
	case DSERR_INVALIDPARAM:
		return "DSERR_INVALIDPARAM";
	case DSERR_PRIOLEVELNEEDED:
		return "DSERR_PRIOLEVELNEEDED";
	}

	return "unknown";
}

/*
** DS_CreateBuffers
*/
static bool DS_CreateBuffers( void )
{
	DSBUFFERDESC	dsbuf;
	DSBCAPS			dsbcaps;
	WAVEFORMATEX	pformat, format;
	DWORD			dwWrite;

	memset (&format, 0, sizeof(format));
	format.wFormatTag = WAVE_FORMAT_PCM;
    format.nChannels = dma.channels;
    format.wBitsPerSample = dma.samplebits;
    format.nSamplesPerSec = dma.speed;
    format.nBlockAlign = format.nChannels * format.wBitsPerSample / 8;
    format.cbSize = 0;
    format.nAvgBytesPerSec = format.nSamplesPerSec*format.nBlockAlign; 

	MsgDev(D_INFO, "Creating DS buffers\n" );

	MsgDev(D_INFO, "...setting EXCLUSIVE coop level: " );
	if ( DS_OK != pDS->lpVtbl->SetCooperativeLevel( pDS, cl_hwnd, DSSCL_EXCLUSIVE ) )
	{
		MsgDev(D_INFO, "failed\n");
		FreeSound ();
		return false;
	}
	MsgDev(D_INFO, "ok\n" );

// get access to the primary buffer, if possible, so we can set the
// sound hardware format
	memset (&dsbuf, 0, sizeof(dsbuf));
	dsbuf.dwSize = sizeof(DSBUFFERDESC);
	dsbuf.dwFlags = DSBCAPS_PRIMARYBUFFER;
	dsbuf.dwBufferBytes = 0;
	dsbuf.lpwfxFormat = NULL;

	memset(&dsbcaps, 0, sizeof(dsbcaps));
	dsbcaps.dwSize = sizeof(dsbcaps);
	primary_format_set = false;

	MsgDev(D_INFO, "...creating primary buffer: " );
	if (DS_OK == pDS->lpVtbl->CreateSoundBuffer(pDS, &dsbuf, &pDSPBuf, NULL))
	{
		pformat = format;

		MsgDev(D_INFO, "ok\n" );
		if (DS_OK != pDSPBuf->lpVtbl->SetFormat (pDSPBuf, &pformat))
		{
			if (snd_firsttime)
				MsgDev (D_INFO, "...setting primary sound format: failed\n");
		}
		else
		{
			if (snd_firsttime)
				MsgDev (D_INFO, "...setting primary sound format: ok\n");

			primary_format_set = true;
		}
	}
	else
		MsgDev(D_INFO, "failed\n" );

	if ( !primary_format_set || !s_primary->value)
	{
		// create the secondary buffer we'll actually work with
		memset (&dsbuf, 0, sizeof(dsbuf));
		dsbuf.dwSize = sizeof(DSBUFFERDESC);
		dsbuf.dwFlags = DSBCAPS_CTRLFREQUENCY | DSBCAPS_LOCSOFTWARE;
		dsbuf.dwBufferBytes = SECONDARY_BUFFER_SIZE;
		dsbuf.lpwfxFormat = &format;

		memset(&dsbcaps, 0, sizeof(dsbcaps));
		dsbcaps.dwSize = sizeof(dsbcaps);

		MsgDev( D_INFO, "...creating secondary buffer: " );
		if (DS_OK != pDS->lpVtbl->CreateSoundBuffer(pDS, &dsbuf, &pDSBuf, NULL))
		{
			MsgDev(D_INFO, "failed\n" );
			FreeSound ();
			return false;
		}
		MsgDev(D_INFO, "ok\n" );

		dma.channels = format.nChannels;
		dma.samplebits = format.wBitsPerSample;
		dma.speed = format.nSamplesPerSec;

		if (DS_OK != pDSBuf->lpVtbl->GetCaps (pDSBuf, &dsbcaps))
		{
			MsgDev(D_WARN, "*** GetCaps failed ***\n");
			FreeSound ();
			return false;
		}

		MsgDev (D_INFO, "...using secondary sound buffer\n");
	}
	else
	{
		MsgDev(D_INFO, "...using primary buffer\n" );

		MsgDev(D_INFO, "...setting WRITEPRIMARY coop level: " );
		if (DS_OK != pDS->lpVtbl->SetCooperativeLevel (pDS, cl_hwnd, DSSCL_WRITEPRIMARY))
		{
			MsgDev( D_INFO, "failed\n" );
			FreeSound ();
			return false;
		}
		MsgDev(D_INFO, "ok\n" );

		if (DS_OK != pDSPBuf->lpVtbl->GetCaps (pDSPBuf, &dsbcaps))
		{
			MsgDev (D_WARN, "*** GetCaps failed ***\n");
			return false;
		}

		pDSBuf = pDSPBuf;
	}

	// Make sure mixer is active
	pDSBuf->lpVtbl->Play(pDSBuf, 0, 0, DSBPLAY_LOOPING);

	if (snd_firsttime)
		Msg("   %d channel(s)\n""   %d bits/sample\n""   %d bytes/sec\n", dma.channels, dma.samplebits, dma.speed);
	
	gSndBufSize = dsbcaps.dwBufferBytes;

	/* we don't want anyone to access the buffer directly w/o locking it first. */
	lpData = NULL; 

	pDSBuf->lpVtbl->Stop(pDSBuf);
	pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &mmstarttime.u.sample, &dwWrite);
	pDSBuf->lpVtbl->Play(pDSBuf, 0, 0, DSBPLAY_LOOPING);

	dma.samples = gSndBufSize/(dma.samplebits/8);
	dma.samplepos = 0;
	dma.submission_chunk = 1;
	dma.buffer = (unsigned char *) lpData;
	sample16 = (dma.samplebits/8) - 1;

	return true;
}

/*
** DS_DestroyBuffers
*/
static void DS_DestroyBuffers( void )
{
	MsgDev(D_INFO, "Destroying DS buffers\n" );
	if ( pDS )
	{
		MsgDev(D_INFO, "...setting NORMAL coop level\n" );
		pDS->lpVtbl->SetCooperativeLevel( pDS, cl_hwnd, DSSCL_NORMAL );
	}

	if ( pDSBuf )
	{
		MsgDev(D_INFO, "...stopping and releasing sound buffer\n" );
		pDSBuf->lpVtbl->Stop( pDSBuf );
		pDSBuf->lpVtbl->Release( pDSBuf );
	}

	// only release primary buffer if it's not also the mixing buffer we just released
	if ( pDSPBuf && ( pDSBuf != pDSPBuf ) )
	{
		MsgDev(D_INFO, "...releasing primary buffer\n" );
		pDSPBuf->lpVtbl->Release( pDSPBuf );
	}
	pDSBuf = NULL;
	pDSPBuf = NULL;

	dma.buffer = NULL;
}

/*
==================
FreeSound
==================
*/
void FreeSound (void)
{
	int		i;

	MsgDev(D_INFO, "Shutting down sound system\n" );

	if ( pDS )
		DS_DestroyBuffers();

	if ( hWaveOut )
	{
		MsgDev(D_INFO, "...resetting waveOut\n" );
		waveOutReset (hWaveOut);

		if (lpWaveHdr)
		{
			MsgDev(D_INFO, "...unpreparing headers\n" );
			for (i=0 ; i< WAV_BUFFERS ; i++)
				waveOutUnprepareHeader (hWaveOut, lpWaveHdr+i, sizeof(WAVEHDR));
		}

		MsgDev(D_INFO, "...closing waveOut\n" );
		waveOutClose (hWaveOut);

		if (hWaveHdr)
		{
			MsgDev(D_INFO, "...freeing WAV header\n" );
			GlobalUnlock(hWaveHdr);
			GlobalFree(hWaveHdr);
		}

		if (hData)
		{
			MsgDev(D_INFO, "...freeing WAV buffer\n" );
			GlobalUnlock(hData);
			GlobalFree(hData);
		}

	}

	if ( pDS )
	{
		MsgDev(D_INFO, "...releasing DS object\n" );
		pDS->lpVtbl->Release( pDS );
	}

	if ( hInstDS )
	{
		MsgDev(D_INFO, "...freeing DSOUND.DLL\n" );
		FreeLibrary( hInstDS );
		hInstDS = NULL;
	}

	pDS = NULL;
	pDSBuf = NULL;
	pDSPBuf = NULL;
	hWaveOut = 0;
	hData = 0;
	hWaveHdr = 0;
	lpData = NULL;
	lpWaveHdr = NULL;
	dsound_init = false;
	wav_init = false;
}

/*
==================
SNDDMA_InitDirect

Direct-Sound support
==================
*/
sndinitstat SNDDMA_InitDirect (void)
{
	DSCAPS			dscaps;
	HRESULT			hresult;

	dma.channels = 2;
	dma.samplebits = 16;

	if (s_khz->value == 44)
		dma.speed = 44100;
	if (s_khz->value == 22)
		dma.speed = 22050;
	else
		dma.speed = 11025;

	Msg( "Initializing DirectSound\n");

	if ( !hInstDS )
	{
		MsgDev(D_INFO, "...loading dsound.dll: " );

		hInstDS = LoadLibrary("dsound.dll");
		
		if (hInstDS == NULL)
		{
			MsgDev (D_INFO, "failed\n");
			return SIS_FAILURE;
		}

		MsgDev (D_INFO, "ok\n");
		pDirectSoundCreate = (void *)GetProcAddress(hInstDS,"DirectSoundCreate");

		if (!pDirectSoundCreate)
		{
			MsgDev (D_ERROR, "*** couldn't get DS proc addr ***\n");
			return SIS_FAILURE;
		}
	}

	MsgDev(D_INFO,  "...creating DS object: " );
	while ( ( hresult = iDirectSoundCreate( NULL, &pDS, NULL ) ) != DS_OK )
	{
		if (hresult != DSERR_ALLOCATED)
		{
			MsgDev(D_INFO, "failed\n" );
			return SIS_FAILURE;
		}

		if (MessageBox (NULL,"The sound hardware is in use by another app.\n\n" "Select Retry to try to start sound again or Cancel to run Quake with no sound.","Sound not available", MB_RETRYCANCEL | MB_SETFOREGROUND | MB_ICONEXCLAMATION) != IDRETRY)
		{
			MsgDev(D_INFO, "failed, hardware already in use\n" );
			return SIS_NOTAVAIL;
		}
	}
	MsgDev(D_INFO,  "ok\n" );

	dscaps.dwSize = sizeof(dscaps);

	if ( DS_OK != pDS->lpVtbl->GetCaps( pDS, &dscaps ) )
	{
		MsgDev(D_WARN, "*** couldn't get DS caps ***\n");
	}

	if ( dscaps.dwFlags & DSCAPS_EMULDRIVER )
	{
		MsgDev (D_ERROR, "...no DSound driver found\n" );
		FreeSound();
		return SIS_FAILURE;
	}

	if ( !DS_CreateBuffers() )
		return SIS_FAILURE;

	dsound_init = true;

	MsgDev(D_INFO, "...completed successfully\n" );

	return SIS_SUCCESS;
}


/*
==================
SNDDM_InitWav

Crappy windows multimedia base
==================
*/
bool SNDDMA_InitWav (void)
{
	WAVEFORMATEX  format; 
	int				i;
	HRESULT			hr;

	MsgDev(D_INFO, "Initializing wave sound\n" );
	
	snd_sent = 0;
	snd_completed = 0;

	dma.channels = 2;
	dma.samplebits = 16;

	if (s_khz->value == 44)
		dma.speed = 44100;
	if (s_khz->value == 22)
		dma.speed = 22050;
	else
		dma.speed = 11025;

	memset (&format, 0, sizeof(format));
	format.wFormatTag = WAVE_FORMAT_PCM;
	format.nChannels = dma.channels;
	format.wBitsPerSample = dma.samplebits;
	format.nSamplesPerSec = dma.speed;
	format.nBlockAlign = format.nChannels
		*format.wBitsPerSample / 8;
	format.cbSize = 0;
	format.nAvgBytesPerSec = format.nSamplesPerSec
		*format.nBlockAlign; 
	
	// Open a waveform device for output using window callback. 
	MsgDev (D_INFO, "...opening waveform device: ");
	while ((hr = waveOutOpen((LPHWAVEOUT)&hWaveOut, WAVE_MAPPER, &format, 0, 0L, CALLBACK_NULL)) != MMSYSERR_NOERROR)
	{
		if (hr != MMSYSERR_ALLOCATED)
		{
			MsgDev(D_INFO, "failed\n");
			return false;
		}

		if (MessageBox (NULL, "The sound hardware is in use by another app.\n\n""Select Retry to try to start sound again or Cancel to run game with no sound.","Sound not available", MB_RETRYCANCEL | MB_SETFOREGROUND | MB_ICONEXCLAMATION) != IDRETRY)
		{
			MsgDev(D_INFO, "hw in use\n" );
			return false;
		}
	} 
	MsgDev(D_INFO, "ok\n" );

	/* 
	 * Allocate and lock memory for the waveform data. The memory 
	 * for waveform data must be globally allocated with 
	 * GMEM_MOVEABLE and GMEM_SHARE flags. 

	*/ 
	MsgDev (D_INFO, "...allocating waveform buffer: ");
	gSndBufSize = WAV_BUFFERS*WAV_BUFFER_SIZE;
	hData = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, gSndBufSize); 
	if (!hData) 
	{ 
		MsgDev(D_INFO, " failed\n" );
		FreeSound ();
		return false; 
	}
	MsgDev(D_INFO, "ok\n" );

	MsgDev (D_INFO, "...locking waveform buffer: ");
	lpData = GlobalLock(hData);
	if (!lpData)
	{ 
		MsgDev(D_INFO, " failed\n" );
		FreeSound ();
		return false; 
	} 
	memset (lpData, 0, gSndBufSize);
	MsgDev(D_INFO, "ok\n" );

	/* 
	 * Allocate and lock memory for the header. This memory must 
	 * also be globally allocated with GMEM_MOVEABLE and 
	 * GMEM_SHARE flags. 
	 */ 
	MsgDev (D_INFO, "...allocating waveform header: ");
	hWaveHdr = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, (DWORD) sizeof(WAVEHDR) * WAV_BUFFERS); 

	if (hWaveHdr == NULL)
	{ 
		MsgDev(D_INFO, "failed\n" );
		FreeSound ();
		return false; 
	} 
	MsgDev(D_INFO, "ok\n" );

	MsgDev (D_INFO, "...locking waveform header: ");
	lpWaveHdr = (LPWAVEHDR) GlobalLock(hWaveHdr); 

	if (lpWaveHdr == NULL)
	{ 
		MsgDev(D_INFO, "failed\n" );
		FreeSound ();
		return false; 
	}
	memset (lpWaveHdr, 0, sizeof(WAVEHDR) * WAV_BUFFERS);
	MsgDev(D_INFO, "ok\n" );

	/* After allocation, set up and prepare headers. */ 
	MsgDev (D_INFO, "...preparing headers: ");
	for (i=0 ; i<WAV_BUFFERS ; i++)
	{
		lpWaveHdr[i].dwBufferLength = WAV_BUFFER_SIZE; 
		lpWaveHdr[i].lpData = lpData + i*WAV_BUFFER_SIZE;

		if (waveOutPrepareHeader(hWaveOut, lpWaveHdr+i, sizeof(WAVEHDR)) !=
				MMSYSERR_NOERROR)
		{
			MsgDev (D_INFO, "failed\n");
			FreeSound ();
			return false;
		}
	}
	MsgDev (D_INFO, "ok\n");

	dma.samples = gSndBufSize/(dma.samplebits/8);
	dma.samplepos = 0;
	dma.submission_chunk = 512;
	dma.buffer = (unsigned char *) lpData;
	sample16 = (dma.samplebits/8) - 1;

	wav_init = true;

	return true;
}

/*
==================
SNDDMA_Init

Try to find a sound device to mix for.
Returns false if nothing is found.
==================
*/
int SNDDMA_Init(void)
{
	sndinitstat	stat;

	memset ((void *)&dma, 0, sizeof (dma));

	s_wavonly = Cvar_Get ("s_wavonly", "0", 0);

	dsound_init = wav_init = 0;

	stat = SIS_FAILURE;	// assume DirectSound won't initialize

	/* Init DirectSound */
	if (!s_wavonly->value)
	{
		if (snd_firsttime || snd_isdirect)
		{
			stat = SNDDMA_InitDirect ();

			if (stat == SIS_SUCCESS)
			{
				snd_isdirect = true;

				if (snd_firsttime)
					MsgDev(D_WARN, "dsound init succeeded\n" );
			}
			else
			{
				snd_isdirect = false;
				MsgDev(D_WARN, "*** dsound init failed ***\n");
			}
		}
	}

// if DirectSound didn't succeed in initializing, try to initialize
// waveOut sound, unless DirectSound failed because the hardware is
// already allocated (in which case the user has already chosen not
// to have sound)
	if (!dsound_init && (stat != SIS_NOTAVAIL))
	{
		if (snd_firsttime || snd_iswave)
		{

			snd_iswave = SNDDMA_InitWav ();

			if (snd_iswave)
			{
				if (snd_firsttime)
					MsgDev(D_WARN, "Wave sound init succeeded\n");
			}
			else
			{
				MsgDev(D_WARN, "Wave sound init failed\n");
			}
		}
	}

	snd_firsttime = false;

	snd_buffer_count = 1;

	if (!dsound_init && !wav_init)
	{
		if (snd_firsttime)
			MsgDev(D_INFO, "*** No sound device initialized ***\n");

		return 0;
	}

	return 1;
}

/*
==============
SNDDMA_GetDMAPos

return the current sample position (in mono samples read)
inside the recirculating dma buffer, so the mixing code will know
how many sample are required to fill it up.
===============
*/
int SNDDMA_GetDMAPos(void)
{
	MMTIME	mmtime;
	int		s;
	DWORD	dwWrite;

	if (dsound_init) 
	{
		mmtime.wType = TIME_SAMPLES;
		pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &mmtime.u.sample, &dwWrite);
		s = mmtime.u.sample - mmstarttime.u.sample;
	}
	else if (wav_init)
	{
		s = snd_sent * WAV_BUFFER_SIZE;
	}


	s >>= sample16;

	s &= (dma.samples-1);

	return s;
}

/*
==============
SNDDMA_BeginPainting

Makes sure dma.buffer is valid
===============
*/
DWORD	locksize;
void SNDDMA_BeginPainting (void)
{
	int		reps;
	DWORD	dwSize2;
	DWORD	*pbuf, *pbuf2;
	HRESULT	hresult;
	DWORD	dwStatus;

	if (!pDSBuf)
		return;

	// if the buffer was lost or stopped, restore it and/or restart it
	if (pDSBuf->lpVtbl->GetStatus (pDSBuf, &dwStatus) != DS_OK)
		MsgDev(D_INFO, "Couldn't get sound buffer status\n");
	
	if (dwStatus & DSBSTATUS_BUFFERLOST)
		pDSBuf->lpVtbl->Restore (pDSBuf);
	
	if (!(dwStatus & DSBSTATUS_PLAYING))
		pDSBuf->lpVtbl->Play(pDSBuf, 0, 0, DSBPLAY_LOOPING);

	// lock the dsound buffer

	reps = 0;
	dma.buffer = NULL;

	while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &locksize, 
								   &pbuf2, &dwSize2, 0)) != DS_OK)
	{
		if (hresult != DSERR_BUFFERLOST)
		{
			MsgDev(D_ERROR,"S_TransferStereo16: Lock failed with error '%s'\n", DSoundError( hresult ) );
			S_Shutdown ();
			return;
		}
		else
		{
			pDSBuf->lpVtbl->Restore( pDSBuf );
		}

		if (++reps > 2)
			return;
	}
	dma.buffer = (unsigned char *)pbuf;
}

/*
==============
SNDDMA_Submit

Send sound to device if buffer isn't really the dma buffer
Also unlocks the dsound buffer
===============
*/
void SNDDMA_Submit(void)
{
	LPWAVEHDR	h;
	int			wResult;

	if (!dma.buffer)
		return;

	// unlock the dsound buffer
	if (pDSBuf)
		pDSBuf->lpVtbl->Unlock(pDSBuf, dma.buffer, locksize, NULL, 0);

	if (!wav_init)
		return;

	//
	// find which sound blocks have completed
	//
	while (1)
	{
		if ( snd_completed == snd_sent )
		{
			MsgDev (D_WARN, "Sound overrun\n");
			break;
		}

		if ( ! (lpWaveHdr[ snd_completed & WAV_MASK].dwFlags & WHDR_DONE) )
		{
			break;
		}

		snd_completed++;	// this buffer has been played
	}

	//
	// submit a few new sound blocks
	//
	while (((snd_sent - snd_completed) >> sample16) < 8)
	{
		h = lpWaveHdr + ( snd_sent&WAV_MASK );
	if (paintedtime/256 <= snd_sent)
		break;	//	Msg ("submit overrun\n");
		snd_sent++;
		/* 
		 * Now the data block can be sent to the output device. The 
		 * waveOutWrite function returns immediately and waveform 
		 * data is sent to the output device in the background. 
		 */ 
		wResult = waveOutWrite(hWaveOut, h, sizeof(WAVEHDR)); 

		if (wResult != MMSYSERR_NOERROR)
		{ 
			MsgDev(D_WARN, "Failed to write block to device\n");
			FreeSound ();
			return; 
		} 
	}
}

/*
==============
SNDDMA_Shutdown

Reset the sound device for exiting
===============
*/
void SNDDMA_Shutdown(void)
{
	FreeSound ();
}


/*
===========
S_Activate

Called when the main window gains or loses focus.
The window have been destroyed and recreated
between a deactivate and an activate.
===========
*/
void S_Activate (bool active)
{
	if ( active )
	{
		if ( pDS && cl_hwnd && snd_isdirect )
		{
			DS_CreateBuffers();
		}
	}
	else
	{
		if ( pDS && cl_hwnd && snd_isdirect )
		{
			DS_DestroyBuffers();
		}
	}
}