fteqw/engine/client/snd_sblaster.c

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/*
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.
*/
//I had one at least, back in the day.
//should be fine for dosbox, if nothing else.
//warning: this sound code doesn't seem to cope well with low framerates. the dma buffer is too small.
//4096 bytes 16bit stereo means 1024 samples. so less than 10 fps and the mixer will miss buffer wraps.
#include <quakedef.h>
#include <dos.h>
#include <dpmi.h>
#include <go32.h>
#include <sys/nearptr.h>
#define SDRVNAME "SoundBlaster"
/*
===============================================================================
BLASTER SUPPORT
===============================================================================
*/
_go32_dpmi_seginfo dma_buffer_memory;
static short *dma_buffer=0; //realigned pointer
quintptr_t dma_buffer_phys; //realigned physical address - must be within the first 16mb
static int dma_size;
static int dma;
static int dsp_port;
static int irq;
static int low_dma;
static int high_dma;
static int mixer_port;
static int mpu401_port;
static int dsp_version;
static int dsp_minor_version;
static int timeconstant=-1;
static int oldmixervalue;
static int mode_reg;
static int flipflop_reg;
static int disable_reg;
static int clear_reg;
static soundcardinfo_t *becauseglobalssuck; //just protects against multiple devices being spawned at once.
static void PrintBits (qbyte b)
{
int i;
char str[9];
for (i=0 ; i<8 ; i++)
str[i] = '0' + ((b & (1<<(7-i))) > 0);
str[8] = 0;
Con_Printf ("%s (%i)", str, b);
}
// =======================================================================
// Interprets BLASTER variable
// =======================================================================
static int GetBLASTER(void)
{
char *BLASTER;
char *param;
BLASTER = getenv("BLASTER");
if (!BLASTER)
return 0;
param = strchr(BLASTER, 'A');
if (!param)
param = strchr(BLASTER, 'a');
if (!param)
return 0;
sscanf(param+1, "%x", &dsp_port);
param = strchr(BLASTER, 'I');
if (!param)
param = strchr(BLASTER, 'i');
if (!param)
return 0;
sscanf(param+1, "%d", &irq);
param = strchr(BLASTER, 'D');
if (!param)
param = strchr(BLASTER, 'd');
if (!param)
return 0;
sscanf(param+1, "%d", &low_dma);
param = strchr(BLASTER, 'H');
if (!param)
param = strchr(BLASTER, 'h');
if (param)
sscanf(param+1, "%d", &high_dma);
param = strchr(BLASTER, 'M');
if (!param)
param = strchr(BLASTER, 'm');
if (param)
sscanf(param+1, "%x", &mixer_port);
else
mixer_port = dsp_port;
param = strchr(BLASTER, 'P');
if (!param)
param = strchr(BLASTER, 'p');
if (param)
sscanf(param+1, "%x", &mpu401_port);
return 1;
}
// ==================================================================
// Resets DSP. Returns 0 on success.
// ==================================================================
static int ResetDSP(void)
{
volatile int i;
outportb(dsp_port + 6, 1);
for (i=65536 ; i ; i--) ;
outportb(dsp_port + 6, 0);
for (i=65536 ; i ; i--)
{
if (!(inportb(dsp_port + 0xe) & 0x80)) continue;
if (inportb(dsp_port + 0xa) == 0xaa) break;
}
if (i) return 0;
else return 1;
}
static int ReadDSP(void)
{
while (!(inportb(dsp_port+0xe)&0x80)) ;
return inportb(dsp_port+0xa);
}
static void WriteDSP(int val)
{
while ((inportb(dsp_port+0xc)&0x80)) ;
outportb(dsp_port+0xc, val);
}
static int ReadMixer(int addr)
{
outportb(mixer_port+4, addr);
return inportb(mixer_port+5);
}
static void WriteMixer(int addr, int val)
{
outportb(mixer_port+4, addr);
outportb(mixer_port+5, val);
}
/*
================
StartSB
================
*/
static void StartSB(soundcardinfo_t *sc)
{
int i;
// version 4.xx startup code
if (dsp_version >= 4)
{
Con_Printf("Version 4 SB startup\n");
WriteDSP(0xd1); // turn on speaker
WriteDSP(0x41);
WriteDSP(sc->sn.speed>>8);
WriteDSP(sc->sn.speed&0xff);
WriteDSP(0xb6); // 16-bit output
WriteDSP(0x30); // stereo
WriteDSP((sc->sn.samples-1) & 0xff); // # of samples - 1
WriteDSP((sc->sn.samples-1) >> 8);
}
// version 3.xx startup code
else if (dsp_version == 3)
{
Con_Printf("Version 3 SB startup\n");
WriteDSP(0xd1); // turn on speaker
oldmixervalue = ReadMixer (0xe);
WriteMixer (0xe, oldmixervalue | 0x2);// turn on stereo
WriteDSP(0x14); // send one byte
WriteDSP(0x0);
WriteDSP(0x0);
for (i=0 ; i<0x10000 ; i++)
inportb(dsp_port+0xe); // ack the dsp
timeconstant = 65536-(256000000/(sc->sn.numchannels*sc->sn.speed));
WriteDSP(0x40);
WriteDSP(timeconstant>>8);
WriteMixer (0xe, ReadMixer(0xe) | 0x20);// turn off filter
WriteDSP(0x48);
WriteDSP((sc->sn.samples-1) & 0xff); // # of samples - 1
WriteDSP((sc->sn.samples-1) >> 8);
WriteDSP(0x90); // high speed 8 bit stereo
}
// normal speed mono
else
{
Con_Printf("Version 2 SB startup\n");
WriteDSP(0xd1); // turn on speaker
timeconstant = 65536-(256000000/(sc->sn.numchannels*sc->sn.speed));
WriteDSP(0x40);
WriteDSP(timeconstant>>8);
WriteDSP(0x48);
WriteDSP((sc->sn.samples-1) & 0xff); // # of samples - 1
WriteDSP((sc->sn.samples-1) >> 8);
WriteDSP(0x1c); // normal speed 8 bit mono
}
}
static const int page_reg[] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
static const int addr_reg[] = { 0, 2, 4, 6, 0xc0, 0xc4, 0xc8, 0xcc };
static const int count_reg[] = { 1, 3, 5, 7, 0xc2, 0xc6, 0xca, 0xce };
/*
================
StartDMA
================
*/
static void StartDMA(void)
{
int mode;
// use a high dma channel if specified
if (high_dma && dsp_version >= 4) // 8 bit snd can never use 16 bit dma
dma = high_dma;
else
dma = low_dma;
Con_Printf ("Using DMA channel %i\n", dma);
if (dma > 3)
{
mode_reg = 0xd6;
flipflop_reg = 0xd8;
disable_reg = 0xd4;
clear_reg = 0xdc;
}
else
{
mode_reg = 0xb;
flipflop_reg = 0xc;
disable_reg = 0xa;
clear_reg = 0xe;
}
outportb(disable_reg, dma|4); // disable channel
// set mode- see "undocumented pc", p.876
mode = (1<<6) // single-cycle
+(0<<5) // address increment
+(1<<4) // auto-init dma
+(2<<2) // read
+(dma&3); // channel #
outportb(mode_reg, mode);
// set address
// set page
outportb(page_reg[dma], dma_buffer_phys >> 16);
if (dma > 3)
{ // address is in words
outportb(flipflop_reg, 0); // prepare to send 16-bit value
outportb(addr_reg[dma], (dma_buffer_phys>>1) & 0xff);
outportb(addr_reg[dma], (dma_buffer_phys>>9) & 0xff);
outportb(flipflop_reg, 0); // prepare to send 16-bit value
outportb(count_reg[dma], ((dma_size>>1)-1) & 0xff);
outportb(count_reg[dma], ((dma_size>>1)-1) >> 8);
}
else
{ // address is in bytes
outportb(flipflop_reg, 0); // prepare to send 16-bit value
outportb(addr_reg[dma], dma_buffer_phys & 0xff);
outportb(addr_reg[dma], (dma_buffer_phys>>8) & 0xff);
outportb(flipflop_reg, 0); // prepare to send 16-bit value
outportb(count_reg[dma], (dma_size-1) & 0xff);
outportb(count_reg[dma], (dma_size-1) >> 8);
}
outportb(clear_reg, 0); // clear write mask
outportb(disable_reg, dma&~4);
}
/*
==============
BLASTER_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.
===============
*/
static unsigned int SBLASTER_GetDMAPos(soundcardinfo_t *sc)
{
int count;
// this function is called often. acknowledge the transfer completions
// all the time so that it loops
if (dsp_version >= 4)
inportb(dsp_port+0xf); // 16 bit audio
else
inportb(dsp_port+0xe); // 8 bit audio
// clear 16-bit reg flip-flop
// load the current dma count register
if (dma < 4)
{
outportb(0xc, 0);
count = inportb(dma*2+1);
count += inportb(dma*2+1) << 8;
if (sc->sn.samplebytes == 2)
count /= 2;
count = sc->sn.samples - (count+1);
}
else
{
outportb(0xd8, 0);
count = inportb(0xc0+(dma-4)*4+2);
count += inportb(0xc0+(dma-4)*4+2) << 8;
if (sc->sn.samplebytes == 1)
count *= 2;
count = sc->sn.samples - (count+1);
}
// Con_Printf("DMA pos = 0x%x\n", count);
// sc->sn.samplepos = count & (sc->sn.samples-1);
return count;
}
/*
==============
BLASTER_Shutdown
Reset the sound device for exiting
===============
*/
static void SBLASTER_Shutdown(soundcardinfo_t *sc)
{
if (becauseglobalssuck == sc)
becauseglobalssuck = NULL;
if (dsp_version >= 4)
{
}
else if (dsp_version == 3)
{
ResetDSP (); // stop high speed mode
WriteMixer (0xe, oldmixervalue); // turn stereo off and filter on
}
else
{
}
WriteDSP(0xd3); // turn off speaker
ResetDSP ();
outportb(disable_reg, dma|4); // disable dma channel
_go32_dpmi_free_dos_memory(&dma_buffer_memory);
}
//simple ring buffer
static void *SBLASTER_LockBuffer(soundcardinfo_t *sc, unsigned int *sampidx)
{
return sc->sn.buffer;
}
//that's permanently locked
static void SBLASTER_UnlockBuffer(soundcardinfo_t *sc, void *buffer)
{
}
//that the hardware has direct access to.
static void SBLASTER_Submit (soundcardinfo_t *sc, int start, int end)
{
}
//returns the address of some memory.
//ctx is required to free the memory afterwards
static qboolean dosmem_alloc(_go32_dpmi_seginfo *ctx, size_t size)
{
ctx->size = (size+15)>>4;
if (_go32_dpmi_allocate_dos_memory(ctx))
return false; //failed
return true;
}
static quintptr_t dosmem_phys(_go32_dpmi_seginfo *ctx)
{
return ctx->rm_segment<<4;
}
static void *dosmem_ptr(_go32_dpmi_seginfo *ctx)
{
__djgpp_nearptr_enable();
return (void*)(__djgpp_conventional_base+dosmem_phys(ctx));
}
/*
==================
BLASTER_Init
Returns false if nothing is found.
==================
*/
static qboolean SBLASTER_InitCard(soundcardinfo_t *sc, const char *pcmname)
{
int size;
int p;
if (becauseglobalssuck)
return 0;
//
// must have a blaster variable set
//
if (!GetBLASTER())
{
Con_NotifyBox (
"The BLASTER environment variable\n"
"is not set, sound effects are\n"
"disabled. See README.TXT for help.\n"
);
return 0;
}
if (ResetDSP())
{
Con_Printf("Could not reset SB");
return 0;
}
//
// get dsp version
//
WriteDSP(0xe1);
dsp_version = ReadDSP();
dsp_minor_version = ReadDSP();
// we need at least v2 for auto-init dma
if (dsp_version < 2)
{
Con_Printf ("Sound blaster must be at least v2.0\n");
return 0;
}
// allow command line parm to set quality down
p = COM_CheckParm ("-dsp");
if (p && p < com_argc - 1)
{
p = Q_atoi (com_argv[p+1]);
if (p < 2 || p > 4)
Con_Printf ("-dsp parameter can only be 2, 3, or 4\n");
else if (p > dsp_version)
Con_Printf ("Can't -dsp %i on v%i hardware\n", p, dsp_version);
else
dsp_version = p;
}
// everyone does 11khz sampling rate unless told otherwise
// sc->sn.speed = 11025;
// rc = COM_CheckParm("-sspeed");
// if (rc)
// sc->sn.speed = Q_atoi(com_argv[rc+1]);
// version 4 cards (sb 16) do 16 bit stereo
if (dsp_version >= 4)
{
if (sc->sn.numchannels != 1)
sc->sn.numchannels = 2;
if (sc->sn.samplebytes != 1)
sc->sn.samplebytes = 2;
}
// version 3 cards (sb pro) do 8 bit stereo
else if (dsp_version == 3)
{
if (sc->sn.numchannels != 1)
sc->sn.numchannels = 2;
sc->sn.samplebytes = 1;
}
// v2 cards do 8 bit mono
else
{
sc->sn.numchannels = 1;
sc->sn.samplebytes = 1;
}
if (sc->sn.samplebytes == 2)
sc->sn.sampleformat = QSF_S16;
else
sc->sn.sampleformat = QSF_U8;
sc->Lock = SBLASTER_LockBuffer;
sc->Unlock = SBLASTER_UnlockBuffer;
sc->Shutdown = SBLASTER_Shutdown;
sc->GetDMAPos = SBLASTER_GetDMAPos;
sc->Submit = SBLASTER_Submit;
size = 4096;
// allocate 8k and get a 4k-aligned buffer from it
if (!dosmem_alloc(&dma_buffer_memory, size*2))
{
Con_Printf("Couldn't allocate sound dma buffer");
return false;
}
dma_buffer_phys = ((dosmem_phys(&dma_buffer_memory) + size) & ~(size-1));
dma_buffer = (short *)((qbyte*)dosmem_ptr(&dma_buffer_memory) + dma_buffer_phys-dosmem_phys(&dma_buffer_memory));
dma_size = size;
memset(dma_buffer, 0, dma_size);
sc->sn.samples = size/sc->sn.samplebytes;
sc->sn.samplepos = 0;
sc->sn.buffer = (unsigned char *) dma_buffer;
sc->sn.samples = size/sc->sn.samplebytes;
StartDMA();
StartSB(sc);
becauseglobalssuck = sc;
return true;
}
static qboolean QDECL SBLASTER_Enumerate(void (QDECL *cb) (const char *drivername, const char *devicecode, const char *readablename))
{
return false;
}
sounddriver_t SBLASTER_Output =
{
SDRVNAME,
SBLASTER_InitCard,
SBLASTER_Enumerate
};