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dosbox-wii/src/hardware/pcspeaker.cpp
retro100 b4f2a13f7f Sync to DOSBox SVN r4301
2021-02-06 16:06:31 +01:00

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/*
* Copyright (C) 2002-2019 The DOSBox Team
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <math.h>
#include "dosbox.h"
#include "mixer.h"
#include "timer.h"
#include "setup.h"
#include "pic.h"
#ifndef PI
#define PI 3.14159265358979323846
#endif
#define SPKR_ENTRIES 1024
#define SPKR_VOLUME 5000
//#define SPKR_SHIFT 8
#define SPKR_SPEED (float)((SPKR_VOLUME*2)/0.070f)
enum SPKR_MODES {
SPKR_OFF,SPKR_ON,SPKR_PIT_OFF,SPKR_PIT_ON
};
struct DelayEntry {
float index;
float vol;
};
static struct {
MixerChannel * chan;
SPKR_MODES mode;
Bitu pit_mode;
Bitu rate;
float pit_last;
float pit_new_max,pit_new_half;
float pit_max,pit_half;
float pit_index;
float volwant,volcur;
Bitu last_ticks;
float last_index;
Bitu min_tr;
DelayEntry entries[SPKR_ENTRIES];
Bitu used;
} spkr;
static void AddDelayEntry(float index,float vol) {
if (spkr.used==SPKR_ENTRIES) {
return;
}
spkr.entries[spkr.used].index=index;
spkr.entries[spkr.used].vol=vol;
spkr.used++;
}
static void ForwardPIT(float newindex) {
float passed=(newindex-spkr.last_index);
float delay_base=spkr.last_index;
spkr.last_index=newindex;
switch (spkr.pit_mode) {
case 0:
return;
case 1:
return;
case 2:
while (passed>0) {
/* passed the initial low cycle? */
if (spkr.pit_index>=spkr.pit_half) {
/* Start a new low cycle */
if ((spkr.pit_index+passed)>=spkr.pit_max) {
float delay=spkr.pit_max-spkr.pit_index;
delay_base+=delay;passed-=delay;
spkr.pit_last=-SPKR_VOLUME;
if (spkr.mode==SPKR_PIT_ON) AddDelayEntry(delay_base,spkr.pit_last);
spkr.pit_index=0;
} else {
spkr.pit_index+=passed;
return;
}
} else {
if ((spkr.pit_index+passed)>=spkr.pit_half) {
float delay=spkr.pit_half-spkr.pit_index;
delay_base+=delay;passed-=delay;
spkr.pit_last=SPKR_VOLUME;
if (spkr.mode==SPKR_PIT_ON) AddDelayEntry(delay_base,spkr.pit_last);
spkr.pit_index=spkr.pit_half;
} else {
spkr.pit_index+=passed;
return;
}
}
}
break;
//END CASE 2
case 3:
while (passed>0) {
/* Determine where in the wave we're located */
if (spkr.pit_index>=spkr.pit_half) {
if ((spkr.pit_index+passed)>=spkr.pit_max) {
float delay=spkr.pit_max-spkr.pit_index;
delay_base+=delay;passed-=delay;
spkr.pit_last=SPKR_VOLUME;
if (spkr.mode==SPKR_PIT_ON) AddDelayEntry(delay_base,spkr.pit_last);
spkr.pit_index=0;
/* Load the new count */
spkr.pit_half=spkr.pit_new_half;
spkr.pit_max=spkr.pit_new_max;
} else {
spkr.pit_index+=passed;
return;
}
} else {
if ((spkr.pit_index+passed)>=spkr.pit_half) {
float delay=spkr.pit_half-spkr.pit_index;
delay_base+=delay;passed-=delay;
spkr.pit_last=-SPKR_VOLUME;
if (spkr.mode==SPKR_PIT_ON) AddDelayEntry(delay_base,spkr.pit_last);
spkr.pit_index=spkr.pit_half;
/* Load the new count */
spkr.pit_half=spkr.pit_new_half;
spkr.pit_max=spkr.pit_new_max;
} else {
spkr.pit_index+=passed;
return;
}
}
}
break;
//END CASE 3
case 4:
if (spkr.pit_index<spkr.pit_max) {
/* Check if we're gonna pass the end this block */
if (spkr.pit_index+passed>=spkr.pit_max) {
float delay=spkr.pit_max-spkr.pit_index;
delay_base+=delay;passed-=delay;
spkr.pit_last=-SPKR_VOLUME;
if (spkr.mode==SPKR_PIT_ON) AddDelayEntry(delay_base,spkr.pit_last); //No new events unless reprogrammed
spkr.pit_index=spkr.pit_max;
} else spkr.pit_index+=passed;
}
break;
//END CASE 4
}
}
void PCSPEAKER_SetCounter(Bitu cntr,Bitu mode) {
if (!spkr.last_ticks) {
if(spkr.chan) spkr.chan->Enable(true);
spkr.last_index=0;
}
spkr.last_ticks=PIC_Ticks;
float newindex=PIC_TickIndex();
ForwardPIT(newindex);
switch (mode) {
case 0: /* Mode 0 one shot, used with realsound */
if (spkr.mode!=SPKR_PIT_ON) return;
if (cntr>80) {
cntr=80;
}
spkr.pit_last=((float)cntr-40)*(SPKR_VOLUME/40.0f);
AddDelayEntry(newindex,spkr.pit_last);
spkr.pit_index=0;
break;
case 1:
if (spkr.mode!=SPKR_PIT_ON) return;
spkr.pit_last=SPKR_VOLUME;
AddDelayEntry(newindex,spkr.pit_last);
break;
case 2: /* Single cycle low, rest low high generator */
spkr.pit_index=0;
spkr.pit_last=-SPKR_VOLUME;
AddDelayEntry(newindex,spkr.pit_last);
spkr.pit_half=(1000.0f/PIT_TICK_RATE)*1;
spkr.pit_max=(1000.0f/PIT_TICK_RATE)*cntr;
break;
case 3: /* Square wave generator */
if (cntr==0 || cntr<spkr.min_tr) {
/* skip frequencies that can't be represented */
spkr.pit_last=0;
spkr.pit_mode=0;
return;
}
spkr.pit_new_max=(1000.0f/PIT_TICK_RATE)*cntr;
spkr.pit_new_half=spkr.pit_new_max/2;
break;
case 4: /* Software triggered strobe */
spkr.pit_last=SPKR_VOLUME;
AddDelayEntry(newindex,spkr.pit_last);
spkr.pit_index=0;
spkr.pit_max=(1000.0f/PIT_TICK_RATE)*cntr;
break;
default:
#if C_DEBUG
LOG_MSG("Unhandled speaker mode %d",mode);
#endif
return;
}
spkr.pit_mode=mode;
}
void PCSPEAKER_SetType(Bitu mode) {
if (!spkr.last_ticks) {
if(spkr.chan) spkr.chan->Enable(true);
spkr.last_index=0;
}
spkr.last_ticks=PIC_Ticks;
float newindex=PIC_TickIndex();
ForwardPIT(newindex);
switch (mode) {
case 0:
spkr.mode=SPKR_OFF;
AddDelayEntry(newindex,-SPKR_VOLUME);
break;
case 1:
spkr.mode=SPKR_PIT_OFF;
AddDelayEntry(newindex,-SPKR_VOLUME);
break;
case 2:
spkr.mode=SPKR_ON;
AddDelayEntry(newindex,SPKR_VOLUME);
break;
case 3:
if (spkr.mode!=SPKR_PIT_ON) {
AddDelayEntry(newindex,spkr.pit_last);
}
spkr.mode=SPKR_PIT_ON;
break;
};
}
static void PCSPEAKER_CallBack(Bitu len) {
Bit16s * stream=(Bit16s*)MixTemp;
ForwardPIT(1);
spkr.last_index=0;
Bitu count=len;
Bitu pos=0;
float sample_base=0;
float sample_add=(1.0001f)/len;
while (count--) {
float index=sample_base;
sample_base+=sample_add;
float end=sample_base;
double value=0;
while(index<end) {
/* Check if there is an upcoming event */
if (spkr.used && spkr.entries[pos].index<=index) {
spkr.volwant=spkr.entries[pos].vol;
pos++;spkr.used--;
continue;
}
float vol_end;
if (spkr.used && spkr.entries[pos].index<end) {
vol_end=spkr.entries[pos].index;
} else vol_end=end;
float vol_len=vol_end-index;
/* Check if we have to slide the volume */
float vol_diff=spkr.volwant-spkr.volcur;
if (vol_diff == 0) {
value+=spkr.volcur*vol_len;
index+=vol_len;
} else {
/* Check how long it will take to goto new level */
float vol_time=fabsf(vol_diff)/SPKR_SPEED;
if (vol_time<=vol_len) {
/* Volume reaches endpoint in this block, calc until that point */
value+=vol_time*spkr.volcur;
value+=vol_time*vol_diff/2;
index+=vol_time;
spkr.volcur=spkr.volwant;
} else {
/* Volume still not reached in this block */
value+=spkr.volcur*vol_len;
if (vol_diff<0) {
value-=(SPKR_SPEED*vol_len*vol_len)/2;
spkr.volcur-=SPKR_SPEED*vol_len;
} else {
value+=(SPKR_SPEED*vol_len*vol_len)/2;
spkr.volcur+=SPKR_SPEED*vol_len;
}
index+=vol_len;
}
}
}
*stream++=(Bit16s)(value/sample_add);
}
if(spkr.chan) spkr.chan->AddSamples_m16(len,(Bit16s*)MixTemp);
//Turn off speaker after 10 seconds of idle or one second idle when in off mode
bool turnoff = false;
Bitu test_ticks = PIC_Ticks;
if ((spkr.last_ticks + 10000) < test_ticks) turnoff = true;
if((spkr.mode == SPKR_OFF) && ((spkr.last_ticks + 1000) < test_ticks)) turnoff = true;
if(turnoff){
if(spkr.volwant == 0) {
spkr.last_ticks = 0;
if(spkr.chan) spkr.chan->Enable(false);
} else {
if(spkr.volwant > 0) spkr.volwant--; else spkr.volwant++;
}
}
}
class PCSPEAKER:public Module_base {
private:
MixerObject MixerChan;
public:
PCSPEAKER(Section* configuration):Module_base(configuration){
spkr.chan=0;
Section_prop * section=static_cast<Section_prop *>(configuration);
if(!section->Get_bool("pcspeaker")) return;
spkr.mode=SPKR_OFF;
spkr.last_ticks=0;
spkr.last_index=0;
spkr.rate=section->Get_int("pcrate");
spkr.pit_mode=3;
spkr.pit_max=(1000.0f/PIT_TICK_RATE)*1320;
spkr.pit_half=spkr.pit_max/2;
spkr.pit_new_max=spkr.pit_max;
spkr.pit_new_half=spkr.pit_half;
spkr.pit_index=0;
spkr.min_tr=(PIT_TICK_RATE+spkr.rate/2-1)/(spkr.rate/2);
spkr.used=0;
/* Register the sound channel */
spkr.chan=MixerChan.Install(&PCSPEAKER_CallBack,spkr.rate,"SPKR");
}
~PCSPEAKER(){
Section_prop * section=static_cast<Section_prop *>(m_configuration);
if(!section->Get_bool("pcspeaker")) return;
}
};
static PCSPEAKER* test;
void PCSPEAKER_ShutDown(Section* sec){
delete test;
}
void PCSPEAKER_Init(Section* sec) {
test = new PCSPEAKER(sec);
sec->AddDestroyFunction(&PCSPEAKER_ShutDown,true);
}
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