samples/quake/jni/snd_mix.cpp - platform/gdk - Git at Google

 /*
 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_mix.c -- portable code to mix sounds for snd_dma.c

 #include "quakedef.h"

 #ifdef _WIN32
 #include "winquake.h"
 #else
 #define DWORD	unsigned long
 #endif

 #define	PAINTBUFFER_SIZE	512

 typedef union {
     portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE];
     int intbuf[PAINTBUFFER_SIZE * sizeof(portable_samplepair_t) / sizeof(int)];
 } portableOrInt_t;

 portableOrInt_t paintbuffer;
 int		snd_scaletable[32][256];
 int 	*snd_p, snd_linear_count, snd_vol;
 short	*snd_out;

 void Snd_WriteLinearBlastStereo16 (void);

 extern void SNDDMA_ReportWrite(size_t lengthBytes);
 #if	!id386
 void Snd_WriteLinearBlastStereo16 (void)
 {
 	int		i;
 	int		val;

 	for (i=0 ; i<snd_linear_count ; i+=2)
 	{
 		val = (snd_p[i]*snd_vol)>>8;
 		if (val > 0x7fff)
 			snd_out[i] = 0x7fff;
 		else if (val < (short)0x8000)
 			snd_out[i] = (short)0x8000;
 		else
 			snd_out[i] = val;

 		val = (snd_p[i+1]*snd_vol)>>8;
 		if (val > 0x7fff)
 			snd_out[i+1] = 0x7fff;
 		else if (val < (short)0x8000)
 			snd_out[i+1] = (short)0x8000;
 		else
 			snd_out[i+1] = val;
 	}
 	SNDDMA_ReportWrite(snd_linear_count << 1);
 }
 #endif

 void S_TransferStereo16 (int endtime)
 {
 	int		lpos;
 	int		lpaintedtime;
 	DWORD	*pbuf;
 #ifdef _WIN32
 	int		reps;
 	DWORD	dwSize,dwSize2;
 	DWORD	*pbuf2;
 	HRESULT	hresult;
 #endif

 	snd_vol = (int)(volume.value*256);

 	snd_p = paintbuffer.intbuf;
 	lpaintedtime = paintedtime;

 #ifdef _WIN32
 	if (pDSBuf)
 	{
 		reps = 0;

 		while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize,
 									   &pbuf2, &dwSize2, 0)) != DS_OK)
 		{
 			if (hresult != DSERR_BUFFERLOST)
 			{
 				Con_Printf ("S_TransferStereo16: DS::Lock Sound Buffer Failed\n");
 				S_Shutdown ();
 				S_Startup ();
 				return;
 			}

 			if (++reps > 10000)
 			{
 				Con_Printf ("S_TransferStereo16: DS: couldn't restore buffer\n");
 				S_Shutdown ();
 				S_Startup ();
 				return;
 			}
 		}
 	}
 	else
 #endif
 	{
 		pbuf = (DWORD *)shm->buffer;
 	}

 	while (lpaintedtime < endtime)
 	{
 	// handle recirculating buffer issues
 		lpos = lpaintedtime & ((shm->samples>>1)-1);

 		snd_out = (short *) pbuf + (lpos<<1);

 		snd_linear_count = (shm->samples>>1) - lpos;
 		if (lpaintedtime + snd_linear_count > endtime)
 			snd_linear_count = endtime - lpaintedtime;

 		snd_linear_count <<= 1;

 	// write a linear blast of samples
 		Snd_WriteLinearBlastStereo16 ();

 		snd_p += snd_linear_count;
 		lpaintedtime += (snd_linear_count>>1);
 	}

 #ifdef _WIN32
 	if (pDSBuf)
 		pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);
 #endif
 }

 void S_TransferPaintBuffer(int endtime)
 {
 	int 	out_idx;
 	int 	count;
 	int 	out_mask;
 	int 	*p;
 	int 	step;
 	int		val;
 	int		snd_vol;
 	DWORD	*pbuf;
 #ifdef _WIN32
 	int		reps;
 	DWORD	dwSize,dwSize2;
 	DWORD	*pbuf2;
 	HRESULT	hresult;
 #endif

 	if (shm->samplebits == 16 && shm->channels == 2)
 	{
 		S_TransferStereo16 (endtime);
 		return;
 	}

 	p = paintbuffer.intbuf;
 	count = (endtime - paintedtime) * shm->channels;
 	out_mask = shm->samples - 1;
 	out_idx = paintedtime * shm->channels & out_mask;
 	step = 3 - shm->channels;
 	snd_vol = (int)(volume.value*256);

 #ifdef _WIN32
 	if (pDSBuf)
 	{
 		reps = 0;

 		while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize,
 									   &pbuf2,&dwSize2, 0)) != DS_OK)
 		{
 			if (hresult != DSERR_BUFFERLOST)
 			{
 				Con_Printf ("S_TransferPaintBuffer: DS::Lock Sound Buffer Failed\n");
 				S_Shutdown ();
 				S_Startup ();
 				return;
 			}

 			if (++reps > 10000)
 			{
 				Con_Printf ("S_TransferPaintBuffer: DS: couldn't restore buffer\n");
 				S_Shutdown ();
 				S_Startup ();
 				return;
 			}
 		}
 	}
 	else
 #endif
 	{
 		pbuf = (DWORD *)shm->buffer;
 	}

 	if (shm->samplebits == 16)
 	{
 		short *out = (short *) pbuf;
 		while (count--)
 		{
 			val = (*p * snd_vol) >> 8;
 			p+= step;
 			if (val > 0x7fff)
 				val = 0x7fff;
 			else if (val < (short)0x8000)
 				val = (short)0x8000;
 			out[out_idx] = val;
 			out_idx = (out_idx + 1) & out_mask;
 		}
 	}
 	else if (shm->samplebits == 8)
 	{
 		unsigned char *out = (unsigned char *) pbuf;
 		while (count--)
 		{
 			val = (*p * snd_vol) >> 8;
 			p+= step;
 			if (val > 0x7fff)
 				val = 0x7fff;
 			else if (val < (short)0x8000)
 				val = (short)0x8000;
 			out[out_idx] = (val>>8) + 128;
 			out_idx = (out_idx + 1) & out_mask;
 		}
 	}

 #ifdef _WIN32
 	if (pDSBuf) {
 		DWORD dwNewpos, dwWrite;
 		int il = paintedtime;
 		int ir = endtime - paintedtime;

 		ir += il;

 		pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);

 		pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &dwNewpos, &dwWrite);

 //		if ((dwNewpos >= il) && (dwNewpos <= ir))
 //			Con_Printf("%d-%d p %d c\n", il, ir, dwNewpos);
 	}
 #endif
 }


 /*
 ===============================================================================

 CHANNEL MIXING

 ===============================================================================
 */

 void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int endtime);
 void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int endtime);

 void S_PaintChannels(int endtime)
 {
 	int 	i;
 	int 	end;
 	channel_t *ch;
 	sfxcache_t	*sc;
 	int		ltime, count;

 	while (paintedtime < endtime)
 	{
 	// if paintbuffer is smaller than DMA buffer
 		end = endtime;
 		if (endtime - paintedtime > PAINTBUFFER_SIZE)
 			end = paintedtime + PAINTBUFFER_SIZE;

 	// clear the paint buffer
 		Q_memset(paintbuffer.paintbuffer, 0, (end - paintedtime) * sizeof(portable_samplepair_t));

 	// paint in the channels.
 		ch = channels;
 		for (i=0; i<total_channels ; i++, ch++)
 		{
 			if (!ch->sfx)
 				continue;
 			if (!ch->leftvol && !ch->rightvol)
 				continue;
 			sc = S_LoadSound (ch->sfx);
 			if (!sc)
 				continue;

 			ltime = paintedtime;

 			while (ltime < end)
 			{	// paint up to end
 				if (ch->end < end)
 					count = ch->end - ltime;
 				else
 					count = end - ltime;

 				if (count > 0)
 				{
 					if (sc->width == 1)
 						SND_PaintChannelFrom8(ch, sc, count);
 					else
 						SND_PaintChannelFrom16(ch, sc, count);

 					ltime += count;
 				}

 			// if at end of loop, restart
 				if (ltime >= ch->end)
 				{
 					if (sc->loopstart >= 0)
 					{
 						ch->pos = sc->loopstart;
 						ch->end = ltime + sc->length - ch->pos;
 					}
 					else
 					{	// channel just stopped
 						ch->sfx = NULL;
 						break;
 					}
 				}
 			}

 		}

 	// transfer out according to DMA format
 		S_TransferPaintBuffer(end);
 		paintedtime = end;
 	}
 }

 void SND_InitScaletable (void)
 {
 	int		i, j;

 	for (i=0 ; i<32 ; i++)
 		for (j=0 ; j<256 ; j++)
 			snd_scaletable[i][j] = ((signed char)j) * i * 8;
 }


 #if	!id386

 void SND_PaintChannelFrom8 (channel_t *ch, sfxcache_t *sc, int count)
 {
 	int 	data;
 	int		*lscale, *rscale;
 	unsigned char *sfx;
 	int		i;

 	if (ch->leftvol > 255)
 		ch->leftvol = 255;
 	if (ch->rightvol > 255)
 		ch->rightvol = 255;

 	lscale = snd_scaletable[ch->leftvol >> 3];
 	rscale = snd_scaletable[ch->rightvol >> 3];
 	sfx = sc->data.uc + ch->pos;

 	for (i=0 ; i<count ; i++)
 	{
 		data = sfx[i];
 		paintbuffer.paintbuffer[i].left += lscale[data];
 		paintbuffer.paintbuffer[i].right += rscale[data];
 	}

 	ch->pos += count;
 }

 #endif	// !id386


 void SND_PaintChannelFrom16 (channel_t *ch, sfxcache_t *sc, int count)
 {
 	int data;
 	int left, right;
 	int leftvol, rightvol;
 	signed short *sfx;
 	int	i;

 	leftvol = ch->leftvol;
 	rightvol = ch->rightvol;
 	sfx = sc->data.ss + ch->pos;

 	for (i=0 ; i<count ; i++)
 	{
 		data = sfx[i];
 		left = (data * leftvol) >> 8;
 		right = (data * rightvol) >> 8;
 		paintbuffer.paintbuffer[i].left += left;
 		paintbuffer.paintbuffer[i].right += right;
 	}

 	ch->pos += count;
 }
	/*
	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_mix.c -- portable code to mix sounds for snd_dma.c

	#include "quakedef.h"

	#ifdef _WIN32
	#include "winquake.h"
	#else
	#define DWORD unsigned long
	#endif

	#define PAINTBUFFER_SIZE 512

	typedef union {
	portable_samplepair_t paintbuffer[PAINTBUFFER_SIZE];
	int intbuf[PAINTBUFFER_SIZE * sizeof(portable_samplepair_t) / sizeof(int)];
	} portableOrInt_t;

	portableOrInt_t paintbuffer;
	int snd_scaletable[32][256];
	int *snd_p, snd_linear_count, snd_vol;
	short *snd_out;

	void Snd_WriteLinearBlastStereo16 (void);

	extern void SNDDMA_ReportWrite(size_t lengthBytes);
	#if !id386
	void Snd_WriteLinearBlastStereo16 (void)
	{
	int i;
	int val;

	for (i=0 ; i<snd_linear_count ; i+=2)
	{
	val = (snd_p[i]*snd_vol)>>8;
	if (val > 0x7fff)
	snd_out[i] = 0x7fff;
	else if (val < (short)0x8000)
	snd_out[i] = (short)0x8000;
	else
	snd_out[i] = val;

	val = (snd_p[i+1]*snd_vol)>>8;
	if (val > 0x7fff)
	snd_out[i+1] = 0x7fff;
	else if (val < (short)0x8000)
	snd_out[i+1] = (short)0x8000;
	else
	snd_out[i+1] = val;
	}
	SNDDMA_ReportWrite(snd_linear_count << 1);
	}
	#endif

	void S_TransferStereo16 (int endtime)
	{
	int lpos;
	int lpaintedtime;
	DWORD *pbuf;
	#ifdef _WIN32
	int reps;
	DWORD dwSize,dwSize2;
	DWORD *pbuf2;
	HRESULT hresult;
	#endif

	snd_vol = (int)(volume.value*256);

	snd_p = paintbuffer.intbuf;
	lpaintedtime = paintedtime;

	#ifdef _WIN32
	if (pDSBuf)
	{
	reps = 0;

	while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize,
	&pbuf2, &dwSize2, 0)) != DS_OK)
	{
	if (hresult != DSERR_BUFFERLOST)
	{
	Con_Printf ("S_TransferStereo16: DS::Lock Sound Buffer Failed\n");
	S_Shutdown ();
	S_Startup ();
	return;
	}

	if (++reps > 10000)
	{
	Con_Printf ("S_TransferStereo16: DS: couldn't restore buffer\n");
	S_Shutdown ();
	S_Startup ();
	return;
	}
	}
	}
	else
	#endif
	{
	pbuf = (DWORD *)shm->buffer;
	}

	while (lpaintedtime < endtime)
	{
	// handle recirculating buffer issues
	lpos = lpaintedtime & ((shm->samples>>1)-1);

	snd_out = (short *) pbuf + (lpos<<1);

	snd_linear_count = (shm->samples>>1) - lpos;
	if (lpaintedtime + snd_linear_count > endtime)
	snd_linear_count = endtime - lpaintedtime;

	snd_linear_count <<= 1;

	// write a linear blast of samples
	Snd_WriteLinearBlastStereo16 ();

	snd_p += snd_linear_count;
	lpaintedtime += (snd_linear_count>>1);
	}

	#ifdef _WIN32
	if (pDSBuf)
	pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);
	#endif
	}

	void S_TransferPaintBuffer(int endtime)
	{
	int out_idx;
	int count;
	int out_mask;
	int *p;
	int step;
	int val;
	int snd_vol;
	DWORD *pbuf;
	#ifdef _WIN32
	int reps;
	DWORD dwSize,dwSize2;
	DWORD *pbuf2;
	HRESULT hresult;
	#endif

	if (shm->samplebits == 16 && shm->channels == 2)
	{
	S_TransferStereo16 (endtime);
	return;
	}

	p = paintbuffer.intbuf;
	count = (endtime - paintedtime) * shm->channels;
	out_mask = shm->samples - 1;
	out_idx = paintedtime * shm->channels & out_mask;
	step = 3 - shm->channels;
	snd_vol = (int)(volume.value*256);

	#ifdef _WIN32
	if (pDSBuf)
	{
	reps = 0;

	while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pbuf, &dwSize,
	&pbuf2,&dwSize2, 0)) != DS_OK)
	{
	if (hresult != DSERR_BUFFERLOST)
	{
	Con_Printf ("S_TransferPaintBuffer: DS::Lock Sound Buffer Failed\n");
	S_Shutdown ();
	S_Startup ();
	return;
	}

	if (++reps > 10000)
	{
	Con_Printf ("S_TransferPaintBuffer: DS: couldn't restore buffer\n");
	S_Shutdown ();
	S_Startup ();
	return;
	}
	}
	}
	else
	#endif
	{
	pbuf = (DWORD *)shm->buffer;
	}

	if (shm->samplebits == 16)
	{
	short out = (short ) pbuf;
	while (count--)
	{
	val = (p snd_vol) >> 8;
	p+= step;
	if (val > 0x7fff)
	val = 0x7fff;
	else if (val < (short)0x8000)
	val = (short)0x8000;
	out[out_idx] = val;
	out_idx = (out_idx + 1) & out_mask;
	}
	}
	else if (shm->samplebits == 8)
	{
	unsigned char out = (unsigned char ) pbuf;
	while (count--)
	{
	val = (p snd_vol) >> 8;
	p+= step;
	if (val > 0x7fff)
	val = 0x7fff;
	else if (val < (short)0x8000)
	val = (short)0x8000;
	out[out_idx] = (val>>8) + 128;
	out_idx = (out_idx + 1) & out_mask;
	}
	}

	#ifdef _WIN32
	if (pDSBuf) {
	DWORD dwNewpos, dwWrite;
	int il = paintedtime;
	int ir = endtime - paintedtime;

	ir += il;

	pDSBuf->lpVtbl->Unlock(pDSBuf, pbuf, dwSize, NULL, 0);

	pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &dwNewpos, &dwWrite);

	// if ((dwNewpos >= il) && (dwNewpos <= ir))
	// Con_Printf("%d-%d p %d c\n", il, ir, dwNewpos);
	}
	#endif
	}


	/*
	===============================================================================

	CHANNEL MIXING

	===============================================================================
	*/

	void SND_PaintChannelFrom8 (channel_t ch, sfxcache_t sc, int endtime);
	void SND_PaintChannelFrom16 (channel_t ch, sfxcache_t sc, int endtime);

	void S_PaintChannels(int endtime)
	{
	int i;
	int end;
	channel_t *ch;
	sfxcache_t *sc;
	int ltime, count;

	while (paintedtime < endtime)
	{
	// if paintbuffer is smaller than DMA buffer
	end = endtime;
	if (endtime - paintedtime > PAINTBUFFER_SIZE)
	end = paintedtime + PAINTBUFFER_SIZE;

	// clear the paint buffer
	Q_memset(paintbuffer.paintbuffer, 0, (end - paintedtime) * sizeof(portable_samplepair_t));

	// paint in the channels.
	ch = channels;
	for (i=0; i<total_channels ; i++, ch++)
	{
	if (!ch->sfx)
	continue;
	if (!ch->leftvol && !ch->rightvol)
	continue;
	sc = S_LoadSound (ch->sfx);
	if (!sc)
	continue;

	ltime = paintedtime;

	while (ltime < end)
	{ // paint up to end
	if (ch->end < end)
	count = ch->end - ltime;
	else
	count = end - ltime;

	if (count > 0)
	{
	if (sc->width == 1)
	SND_PaintChannelFrom8(ch, sc, count);
	else
	SND_PaintChannelFrom16(ch, sc, count);

	ltime += count;
	}

	// if at end of loop, restart
	if (ltime >= ch->end)
	{
	if (sc->loopstart >= 0)
	{
	ch->pos = sc->loopstart;
	ch->end = ltime + sc->length - ch->pos;
	}
	else
	{ // channel just stopped
	ch->sfx = NULL;
	break;
	}
	}
	}

	}

	// transfer out according to DMA format
	S_TransferPaintBuffer(end);
	paintedtime = end;
	}
	}

	void SND_InitScaletable (void)
	{
	int i, j;

	for (i=0 ; i<32 ; i++)
	for (j=0 ; j<256 ; j++)
	snd_scaletable[i][j] = ((signed char)j) * i * 8;
	}


	#if !id386

	void SND_PaintChannelFrom8 (channel_t ch, sfxcache_t sc, int count)
	{
	int data;
	int lscale, rscale;
	unsigned char *sfx;
	int i;

	if (ch->leftvol > 255)
	ch->leftvol = 255;
	if (ch->rightvol > 255)
	ch->rightvol = 255;

	lscale = snd_scaletable[ch->leftvol >> 3];
	rscale = snd_scaletable[ch->rightvol >> 3];
	sfx = sc->data.uc + ch->pos;

	for (i=0 ; i<count ; i++)
	{
	data = sfx[i];
	paintbuffer.paintbuffer[i].left += lscale[data];
	paintbuffer.paintbuffer[i].right += rscale[data];
	}

	ch->pos += count;
	}

	#endif // !id386


	void SND_PaintChannelFrom16 (channel_t ch, sfxcache_t sc, int count)
	{
	int data;
	int left, right;
	int leftvol, rightvol;
	signed short *sfx;
	int i;

	leftvol = ch->leftvol;
	rightvol = ch->rightvol;
	sfx = sc->data.ss + ch->pos;

	for (i=0 ; i<count ; i++)
	{
	data = sfx[i];
	left = (data * leftvol) >> 8;
	right = (data * rightvol) >> 8;
	paintbuffer.paintbuffer[i].left += left;
	paintbuffer.paintbuffer[i].right += right;
	}

	ch->pos += count;
	}