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PCE: sample playback

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tildearrow 2021-06-08 23:16:29 -05:00
parent 5b2684b5e1
commit 451c35f41b
3 changed files with 47 additions and 1 deletions
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41
src/engine/platform/pce.cpp
View file

@ -14,6 +14,29 @@
#define FREQ_BASE 1712.0f*2
void DivPlatformPCE::acquire(int& l, int& r) {
// PCM part
for (int i=0; i<6; i++) {
if (chan[i].pcm && chan[i].dacSample!=-1) {
if (--chan[i].dacPeriod<1) {
DivSample* s=parent->song.sample[chan[i].dacSample];
chWrite(i,0x07,0);
if (s->depth==8) {
printf("Screw your 8 bit samples\n");
//writes.emplace(0x2a,(unsigned char)s->rendData[chan[i].dacPos++]+0x80);
} else {
chWrite(i,0x04,0xdf);
chWrite(i,0x06,(((unsigned short)s->rendData[chan[i].dacPos++]+0x8000)>>11));
//writes.emplace(0x2a,((unsigned short)s->rendData[chan[i].dacPos++]+0x8000)>>8);
}
if (chan[i].dacPos>=s->rendLength) {
chan[i].dacSample=-1;
}
chan[i].dacPeriod=chan[i].dacRate;
}
}
}
// PCE part
while (!writes.empty()) {
QueuedWrite w=writes.front();
pce->Write(cycles,w.addr,w.val);
@ -45,6 +68,10 @@ static unsigned char noiseFreq[12]={
4,13,15,18,21,23,25,27,29,31,0,2
};
static int dacRates[6]={
224,224,162,112,81,56
};
void DivPlatformPCE::tick() {
for (int i=0; i<6; i++) {
chan[i].std.next();
@ -106,6 +133,17 @@ void DivPlatformPCE::tick() {
int DivPlatformPCE::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON:
if (chan[c.chan].pcm) {
chan[c.chan].dacSample=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=dacRates[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;
@ -176,6 +214,9 @@ int DivPlatformPCE::dispatch(DivCommand c) {
chan[c.chan].noise=c.value;
chWrite(c.chan,0x07,chan[c.chan].noise?(0x80|chan[c.chan].note):0);
break;
case DIV_CMD_SAMPLE_MODE:
chan[c.chan].pcm=c.value;
break;
case DIV_CMD_PANNING: {
chan[c.chan].pan=c.value;
chWrite(c.chan,0x05,chan[c.chan].pan);

4
src/engine/platform/pce.h
View file

@ -9,8 +9,9 @@
class DivPlatformPCE: public DivDispatch {
struct Channel {
int freq, baseFreq, pitch;
int dacPeriod, dacRate, dacPos, dacSample;
unsigned char ins, note, pan;
bool active, insChanged, freqChanged, keyOn, keyOff, inPorta, noise;
bool active, insChanged, freqChanged, keyOn, keyOff, inPorta, noise, pcm;
signed char vol, outVol, wave;
DivMacroInt std;
Channel():
@ -27,6 +28,7 @@ class DivPlatformPCE: public DivDispatch {
keyOff(false),
inPorta(false),
noise(false),
pcm(false),
vol(31),
outVol(31),
wave(-1) {}

3
src/engine/playback.cpp
View file

@ -117,6 +117,9 @@ bool DivEngine::perSystemEffect(int ch, unsigned char effect, unsigned char effe
case 0x11: // noise mode
dispatchCmd(DivCommand(DIV_CMD_STD_NOISE_MODE,ch,effectVal));
break;
case 0x17: // PCM enable
dispatchCmd(DivCommand(DIV_CMD_SAMPLE_MODE,ch,(effectVal>0)));
break;
default:
return false;
}