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Add LFSR feedback bits, 1-bit noise and wave mix mode macros. I hope I am done with main macros now

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LTVA1 2024-08-05 15:50:48 +03:00
parent 2fb518231a
commit bfbc92e1f3
6 changed files with 145 additions and 9 deletions
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32
src/engine/platform/sid3.cpp
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@ -149,6 +149,14 @@ void DivPlatformSID3::updateNoiseFreq(int channel)
rWrite(SID3_REGISTER_NOISE_FREQ_LOW + channel*SID3_REGISTERS_PER_CHANNEL,chan[channel].noiseFreq & 0xff);
}
void DivPlatformSID3::updateNoiseLFSRMask(int channel)
{
rWrite(SID3_REGISTER_NOISE_LFSR_HIGHEST + channel*SID3_REGISTERS_PER_CHANNEL,(chan[channel].noiseLFSRMask >> 24) & 0xff);
rWrite(SID3_REGISTER_NOISE_LFSR_HIGH + channel*SID3_REGISTERS_PER_CHANNEL,(chan[channel].noiseLFSRMask >> 16) & 0xff);
rWrite(SID3_REGISTER_NOISE_LFSR_MID + channel*SID3_REGISTERS_PER_CHANNEL,(chan[channel].noiseLFSRMask >> 8) & 0xff);
rWrite(SID3_REGISTER_NOISE_LFSR_LOW + channel*SID3_REGISTERS_PER_CHANNEL,chan[channel].noiseLFSRMask & 0xff);
}
void DivPlatformSID3::updateDuty(int channel)
{
rWrite(SID3_REGISTER_PW_HIGH + channel*SID3_REGISTERS_PER_CHANNEL,(chan[channel].duty >> 8) & 0xff);
@ -302,6 +310,28 @@ void DivPlatformSID3::tick(bool sysTick)
chan[i].release = chan[i].std.ex6.val & 0xff;
envChanged = true;
}
if (chan[i].std.ex7.had) { //noise LFSR feedback bits
chan[i].noiseLFSRMask = chan[i].std.ex7.val & 0x3fffffff;
updateNoiseLFSRMask(i);
}
if (chan[i].std.op[1].ar.had) { //1-bit noise / PCM mode for wavetable chan
if(i == SID3_NUM_CHANNELS - 1) //wave chan
{
rWrite(SID3_REGISTER_WAVEFORM + i * SID3_REGISTERS_PER_CHANNEL, chan[i].std.op[1].ar.val & 1);
}
else
{
if((uint32_t)chan[i].oneBitNoise != (chan[i].std.op[1].ar.val & 1))
{
chan[i].oneBitNoise = chan[i].std.op[1].ar.val & 1;
flagsChanged = true;
}
}
}
if (chan[i].std.ex8.had) { //wave mix mode
chan[i].mix_mode = chan[i].std.ex8.val & 0xff;
rWrite(SID3_REGISTER_MIXMODE + i * SID3_REGISTERS_PER_CHANNEL, chan[i].mix_mode); //mixmode
}
if(panChanged)
{
@ -677,6 +707,8 @@ void DivPlatformSID3::reset() {
chan[i].freq = chan[i].noiseFreq = 0;
updatePanning(i);
chan[i].noiseLFSRMask = (1 << 29) | (1 << 5) | (1 << 3) | 1; //https://docs.amd.com/v/u/en-US/xapp052 for 30 bits: 30, 6, 4, 1
}
sid3_reset(sid3);