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prepare for amiga system
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tildearrow
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2 changed files with 312 additions and 0 deletions
254
src/engine/platform/amiga.cpp
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254
src/engine/platform/amiga.cpp
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#include "amiga.h"
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#include "../engine.h"
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#include <math.h>
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#define FREQ_BASE 1712.0f
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#define AMIGA_DIVIDER 8
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void DivPlatformAmiga::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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for (size_t h=start; h<start+len; h++) {
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// PCM part
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for (int i=0; i<4; i++) {
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if (chan[i].audSample!=-1) {
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chan[i].audSub-=AMIGA_DIVIDER;
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if (chan[i].audSub<1) {
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DivSample* s=parent->song.sample[chan[i].dacSample];
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if (s->depth==8) {
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chan[i].audOut=s->rendData[chan[i].audPos];
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} else {
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chan[i].audOut=s->rendData[chan[i].audPos]>>8;
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}
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if (chan[i].audPos>=s->rendLength) {
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chan[i].audSample=-1;
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}
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chan[i].audSub+=chan[i].freq;
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}
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}
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}
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bufL[h]=(chan[0].audOut*chan[0].outVol)+;
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(chan[3].audOut*chan[3].outVol);
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bufR[h]=(chan[1].audOut*chan[1].outVol)+;
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(chan[2].audOut*chan[2].outVol);
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}
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}
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void DivPlatformAmiga::tick() {
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for (int i=0; i<4; i++) {
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chan[i].std.next();
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if (chan[i].std.hadVol) {
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chan[i].outVol=(chan[i].vol*chan[i].std.vol)>>6;
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}
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if (chan[i].std.hadArp) {
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if (!chan[i].inPorta) {
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if (chan[i].std.arpMode) {
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chan[i].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(chan[i].std.arp)/12.0f)));
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} else {
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chan[i].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(chan[i].note+chan[i].std.arp-12)/12.0f)));
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}
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}
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chan[i].freqChanged=true;
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} else {
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if (chan[i].std.arpMode && chan[i].std.finishedArp) {
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chan[i].baseFreq=round(FREQ_BASE/pow(2.0f,((float)(chan[i].note)/12.0f)));
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chan[i].freqChanged=true;
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}
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}
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if (chan[i].std.hadWave) {
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if (chan[i].wave!=chan[i].std.wave) {
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chan[i].wave=chan[i].std.wave;
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updateWave(i);
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if (!chan[i].keyOff) chan[i].keyOn=true;
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}
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}
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if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
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//DivInstrument* ins=parent->getIns(chan[i].ins);
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chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true);
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if (chan[i].freq>4095) chan[i].freq=4095;
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if (chan[i].note>0x5d) chan[i].freq=0x01;
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if (chan[i].keyOn) {
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if (chan[i].wave<0) {
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chan[i].wave=0;
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updateWave(i);
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}
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}
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if (chan[i].keyOff) {
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}
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if (chan[i].keyOn) chan[i].keyOn=false;
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if (chan[i].keyOff) chan[i].keyOff=false;
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chan[i].freqChanged=false;
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}
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}
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}
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int DivPlatformAmiga::dispatch(DivCommand c) {
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switch (c.cmd) {
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case DIV_CMD_NOTE_ON:
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if (chan[c.chan].pcm) {
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chan[c.chan].dacSample=12*sampleBank+c.value%12;
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if (chan[c.chan].dacSample>=parent->song.sampleLen) {
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chan[c.chan].dacSample=-1;
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break;
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}
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chan[c.chan].dacPos=0;
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chan[c.chan].dacPeriod=0;
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chan[c.chan].dacRate=1789773/parent->song.sample[chan[c.chan].dacSample]->rate;
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break;
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}
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chan[c.chan].baseFreq=round(FREQ_BASE/pow(2.0f,((float)c.value/12.0f)));
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=c.value;
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chan[c.chan].active=true;
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chan[c.chan].keyOn=true;
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chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
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break;
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case DIV_CMD_NOTE_OFF:
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chan[c.chan].dacSample=-1;
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chan[c.chan].pcm=false;
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chan[c.chan].active=false;
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chan[c.chan].keyOff=true;
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chan[c.chan].std.init(NULL);
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break;
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case DIV_CMD_INSTRUMENT:
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if (chan[c.chan].ins!=c.value) {
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chan[c.chan].ins=c.value;
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}
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break;
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case DIV_CMD_VOLUME:
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if (chan[c.chan].vol!=c.value) {
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chan[c.chan].vol=c.value;
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if (!chan[c.chan].std.hasVol) {
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chan[c.chan].outVol=c.value;
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}
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}
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break;
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case DIV_CMD_GET_VOLUME:
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if (chan[c.chan].std.hasVol) {
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return chan[c.chan].vol;
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}
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return chan[c.chan].outVol;
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break;
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case DIV_CMD_PITCH:
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chan[c.chan].pitch=c.value;
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chan[c.chan].freqChanged=true;
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break;
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case DIV_CMD_WAVE:
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chan[c.chan].wave=c.value;
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updateWave(c.chan);
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chan[c.chan].keyOn=true;
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break;
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case DIV_CMD_NOTE_PORTA: {
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int destFreq=round(FREQ_BASE/pow(2.0f,((float)c.value2/12.0f)));
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bool return2=false;
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if (destFreq>chan[c.chan].baseFreq) {
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chan[c.chan].baseFreq+=c.value;
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if (chan[c.chan].baseFreq>=destFreq) {
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chan[c.chan].baseFreq=destFreq;
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return2=true;
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}
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} else {
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chan[c.chan].baseFreq-=c.value;
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if (chan[c.chan].baseFreq<=destFreq) {
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chan[c.chan].baseFreq=destFreq;
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return2=true;
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}
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}
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chan[c.chan].freqChanged=true;
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if (return2) {
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chan[c.chan].inPorta=false;
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return 2;
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}
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break;
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}
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case DIV_CMD_STD_NOISE_MODE:
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chan[c.chan].noise=c.value;
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break;
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case DIV_CMD_SAMPLE_MODE:
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chan[c.chan].pcm=c.value;
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break;
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case DIV_CMD_SAMPLE_BANK:
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sampleBank=c.value;
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if (sampleBank>(parent->song.sample.size()/12)) {
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sampleBank=parent->song.sample.size()/12;
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}
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break;
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case DIV_CMD_PANNING: {
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chan[c.chan].pan=c.value;
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break;
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}
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case DIV_CMD_LEGATO:
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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)));
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=c.value;
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break;
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case DIV_CMD_PRE_PORTA:
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chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
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chan[c.chan].inPorta=c.value;
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break;
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case DIV_CMD_GET_VOLMAX:
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return 31;
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break;
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case DIV_ALWAYS_SET_VOLUME:
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return 1;
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break;
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default:
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break;
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}
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return 1;
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}
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void DivPlatformAmiga::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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}
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void DivPlatformAmiga::forceIns() {
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for (int i=0; i<4; i++) {
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chan[i].insChanged=true;
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chan[i].freqChanged=true;
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}
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}
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void DivPlatformAmiga::reset() {
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for (int i=0; i<4; i++) {
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chan[i]=DivPlatformAmiga::Channel();
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}
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}
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bool DivPlatformAmiga::isStereo() {
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return true;
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}
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bool DivPlatformAmiga::keyOffAffectsArp(int ch) {
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return true;
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}
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void DivPlatformAmiga::notifyInsDeletion(void* ins) {
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for (int i=0; i<4; i++) {
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chan[i].std.notifyInsDeletion((DivInstrument*)ins);
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}
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}
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void DivPlatformAmiga::setPAL(bool pal) {
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if (pal) {
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rate=3546895/AMIGA_DIVIDER;
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} else {
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rate=3579545/AMIGA_DIVIDER;
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}
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}
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int DivPlatformAmiga::init(DivEngine* p, int channels, int sugRate, bool pal) {
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parent=p;
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skipRegisterWrites=false;
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for (int i=0; i<4; i++) {
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isMuted[i]=false;
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}
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setPAL(pal);
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reset();
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return 6;
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}
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void DivPlatformAmiga::quit() {
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delete pce;
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}
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DivPlatformAmiga::~DivPlatformAmiga() {
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}
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58
src/engine/platform/amiga.h
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58
src/engine/platform/amiga.h
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@ -0,0 +1,58 @@
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#ifndef _PCE_H
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#define _PCE_H
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#include "../dispatch.h"
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#include <queue>
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#include "../macroInt.h"
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class DivPlatformAmiga: public DivDispatch {
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struct Channel {
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int freq, baseFreq, pitch;
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unsigned int audLoc;
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unsigned short audLen;
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unsigned int audPos;
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signed char audDat;
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int sample;
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unsigned char ins, note;
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bool active, insChanged, freqChanged, keyOn, keyOff, inPorta;
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signed char vol, outVol;
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DivMacroInt std;
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Channel():
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freq(0),
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baseFreq(0),
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pitch(0),
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audLoc(0),
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audLen(0),
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audPos(0),
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audDat(0),
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sample(-1),
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ins(-1),
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note(0),
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active(false),
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insChanged(true),
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freqChanged(false),
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keyOn(false),
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keyOff(false),
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inPorta(false),
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vol(64),
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outVol(64) {}
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};
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Channel chan[4];
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bool isMuted[4];
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public:
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void acquire(short* bufL, short* bufR, size_t start, size_t len);
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int dispatch(DivCommand c);
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void reset();
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void forceIns();
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void tick();
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void muteChannel(int ch, bool mute);
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bool isStereo();
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bool keyOffAffectsArp(int ch);
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void setPAL(bool pal);
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void notifyInsDeletion(void* ins);
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int init(DivEngine* parent, int channels, int sugRate, bool pal);
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void quit();
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};
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#endif
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