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prepare for amiga system

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tildearrow 2022-01-15 15:50:53 -05:00
parent 2f1cdab36b
commit a06a82ca89
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254
src/engine/platform/amiga.cpp Normal file
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#include "amiga.h"
#include "../engine.h"
#include <math.h>
#define FREQ_BASE 1712.0f
#define AMIGA_DIVIDER 8
void DivPlatformAmiga::acquire(short* bufL, short* bufR, size_t start, size_t len) {
for (size_t h=start; h<start+len; h++) {
// PCM part
for (int i=0; i<4; i++) {
if (chan[i].audSample!=-1) {
chan[i].audSub-=AMIGA_DIVIDER;
if (chan[i].audSub<1) {
DivSample* s=parent->song.sample[chan[i].dacSample];
if (s->depth==8) {
chan[i].audOut=s->rendData[chan[i].audPos];
} else {
chan[i].audOut=s->rendData[chan[i].audPos]>>8;
}
if (chan[i].audPos>=s->rendLength) {
chan[i].audSample=-1;
}
chan[i].audSub+=chan[i].freq;
}
}
}
bufL[h]=(chan[0].audOut*chan[0].outVol)+;
(chan[3].audOut*chan[3].outVol);
bufR[h]=(chan[1].audOut*chan[1].outVol)+;
(chan[2].audOut*chan[2].outVol);
}
}
void DivPlatformAmiga::tick() {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
chan[i].outVol=(chan[i].vol*chan[i].std.vol)>>6;
}
if (chan[i].std.hadArp) {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(chan[i].std.arp)/12.0f)));
} else {
chan[i].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(chan[i].note+chan[i].std.arp-12)/12.0f)));
}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
chan[i].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(chan[i].note)/12.0f)));
chan[i].freqChanged=true;
}
}
if (chan[i].std.hadWave) {
if (chan[i].wave!=chan[i].std.wave) {
chan[i].wave=chan[i].std.wave;
updateWave(i);
if (!chan[i].keyOff) chan[i].keyOn=true;
}
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
//DivInstrument* ins=parent->getIns(chan[i].ins);
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true);
if (chan[i].freq>4095) chan[i].freq=4095;
if (chan[i].note>0x5d) chan[i].freq=0x01;
if (chan[i].keyOn) {
if (chan[i].wave<0) {
chan[i].wave=0;
updateWave(i);
}
}
if (chan[i].keyOff) {
}
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
}
}
}
int DivPlatformAmiga::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON:
if (chan[c.chan].pcm) {
chan[c.chan].dacSample=12*sampleBank+c.value%12;
if (chan[c.chan].dacSample>=parent->song.sampleLen) {
chan[c.chan].dacSample=-1;
break;
}
chan[c.chan].dacPos=0;
chan[c.chan].dacPeriod=0;
chan[c.chan].dacRate=1789773/parent->song.sample[chan[c.chan].dacSample]->rate;
break;
}
chan[c.chan].baseFreq=round(FREQ_BASE/pow(2.0f,((float)c.value/12.0f)));
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
chan[c.chan].active=true;
chan[c.chan].keyOn=true;
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
break;
case DIV_CMD_NOTE_OFF:
chan[c.chan].dacSample=-1;
chan[c.chan].pcm=false;
chan[c.chan].active=false;
chan[c.chan].keyOff=true;
chan[c.chan].std.init(NULL);
break;
case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value) {
chan[c.chan].ins=c.value;
}
break;
case DIV_CMD_VOLUME:
if (chan[c.chan].vol!=c.value) {
chan[c.chan].vol=c.value;
if (!chan[c.chan].std.hasVol) {
chan[c.chan].outVol=c.value;
}
}
break;
case DIV_CMD_GET_VOLUME:
if (chan[c.chan].std.hasVol) {
return chan[c.chan].vol;
}
return chan[c.chan].outVol;
break;
case DIV_CMD_PITCH:
chan[c.chan].pitch=c.value;
chan[c.chan].freqChanged=true;
break;
case DIV_CMD_WAVE:
chan[c.chan].wave=c.value;
updateWave(c.chan);
chan[c.chan].keyOn=true;
break;
case DIV_CMD_NOTE_PORTA: {
int destFreq=round(FREQ_BASE/pow(2.0f,((float)c.value2/12.0f)));
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
chan[c.chan].baseFreq+=c.value;
if (chan[c.chan].baseFreq>=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
} else {
chan[c.chan].baseFreq-=c.value;
if (chan[c.chan].baseFreq<=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
}
chan[c.chan].freqChanged=true;
if (return2) {
chan[c.chan].inPorta=false;
return 2;
}
break;
}
case DIV_CMD_STD_NOISE_MODE:
chan[c.chan].noise=c.value;
break;
case DIV_CMD_SAMPLE_MODE:
chan[c.chan].pcm=c.value;
break;
case DIV_CMD_SAMPLE_BANK:
sampleBank=c.value;
if (sampleBank>(parent->song.sample.size()/12)) {
sampleBank=parent->song.sample.size()/12;
}
break;
case DIV_CMD_PANNING: {
chan[c.chan].pan=c.value;
break;
}
case DIV_CMD_LEGATO:
chan[c.chan].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(c.value+((chan[c.chan].std.willArp && !chan[c.chan].std.arpMode)?(chan[c.chan].std.arp-12):(0)))/12.0f)));
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
break;
case DIV_CMD_PRE_PORTA:
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
chan[c.chan].inPorta=c.value;
break;
case DIV_CMD_GET_VOLMAX:
return 31;
break;
case DIV_ALWAYS_SET_VOLUME:
return 1;
break;
default:
break;
}
return 1;
}
void DivPlatformAmiga::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
}
void DivPlatformAmiga::forceIns() {
for (int i=0; i<4; i++) {
chan[i].insChanged=true;
chan[i].freqChanged=true;
}
}
void DivPlatformAmiga::reset() {
for (int i=0; i<4; i++) {
chan[i]=DivPlatformAmiga::Channel();
}
}
bool DivPlatformAmiga::isStereo() {
return true;
}
bool DivPlatformAmiga::keyOffAffectsArp(int ch) {
return true;
}
void DivPlatformAmiga::notifyInsDeletion(void* ins) {
for (int i=0; i<4; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformAmiga::setPAL(bool pal) {
if (pal) {
rate=3546895/AMIGA_DIVIDER;
} else {
rate=3579545/AMIGA_DIVIDER;
}
}
int DivPlatformAmiga::init(DivEngine* p, int channels, int sugRate, bool pal) {
parent=p;
skipRegisterWrites=false;
for (int i=0; i<4; i++) {
isMuted[i]=false;
}
setPAL(pal);
reset();
return 6;
}
void DivPlatformAmiga::quit() {
delete pce;
}
DivPlatformAmiga::~DivPlatformAmiga() {
}

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src/engine/platform/amiga.h Normal file
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#ifndef _PCE_H
#define _PCE_H
#include "../dispatch.h"
#include <queue>
#include "../macroInt.h"
class DivPlatformAmiga: public DivDispatch {
struct Channel {
int freq, baseFreq, pitch;
unsigned int audLoc;
unsigned short audLen;
unsigned int audPos;
signed char audDat;
int sample;
unsigned char ins, note;
bool active, insChanged, freqChanged, keyOn, keyOff, inPorta;
signed char vol, outVol;
DivMacroInt std;
Channel():
freq(0),
baseFreq(0),
pitch(0),
audLoc(0),
audLen(0),
audPos(0),
audDat(0),
sample(-1),
ins(-1),
note(0),
active(false),
insChanged(true),
freqChanged(false),
keyOn(false),
keyOff(false),
inPorta(false),
vol(64),
outVol(64) {}
};
Channel chan[4];
bool isMuted[4];
public:
void acquire(short* bufL, short* bufR, size_t start, size_t len);
int dispatch(DivCommand c);
void reset();
void forceIns();
void tick();
void muteChannel(int ch, bool mute);
bool isStereo();
bool keyOffAffectsArp(int ch);
void setPAL(bool pal);
void notifyInsDeletion(void* ins);
int init(DivEngine* parent, int channels, int sugRate, bool pal);
void quit();
};
#endif