otomatalabs/furnace
7
0
Fork 0
Code Issues Pull requests Actions Packages Projects Releases Wiki Activity

it plays basic waves with reSID envelope for now

Browse source
This commit is contained in:
LTVA1 2024-07-30 21:01:17 +03:00
parent 719cec89b1
commit 8ac7fa7de5
4 changed files with 148 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
src/engine/platform/sid3.cpp
View file

@ -107,6 +107,19 @@ void DivPlatformSID3::updateFilter(int channel)
//rWrite(0x17 + 3 * channel,chan[channel].filtRes);
}
void DivPlatformSID3::updateFreq(int channel)
{
rWrite(10 + channel*SID3_REGISTERS_PER_CHANNEL,(chan[channel].freq >> 16) & 0xff);
rWrite(11 + channel*SID3_REGISTERS_PER_CHANNEL,(chan[channel].freq >> 8) & 0xff);
rWrite(12 + channel*SID3_REGISTERS_PER_CHANNEL,chan[channel].freq & 0xff);
}
void DivPlatformSID3::updateDuty(int channel)
{
rWrite(7 + channel*SID3_REGISTERS_PER_CHANNEL,(chan[channel].duty >> 8) & 0xff);
rWrite(8 + channel*SID3_REGISTERS_PER_CHANNEL,chan[channel].duty & 0xff);
}
void DivPlatformSID3::tick(bool sysTick)
{
for (int i=0; i<SID3_NUM_CHANNELS; i++)
@ -115,13 +128,17 @@ void DivPlatformSID3::tick(bool sysTick)
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff)
{
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,false,8,chan[i].pitch2,chipClock,CHIP_FREQBASE);
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE * 64);
//if (chan[i].freq<0) chan[i].freq=0;
//if (chan[i].freq>0x1ffff) chan[i].freq=0x1ffff;
if (chan[i].keyOn)
{
rWrite(i*SID3_REGISTERS_PER_CHANNEL,SID3_CHAN_ENABLE_GATE);
rWrite(6 + i*SID3_REGISTERS_PER_CHANNEL,SID3_WAVE_PULSE);
chan[i].duty = 0x1000;
updateDuty(i);
}
if (chan[i].keyOff)
{
@ -129,7 +146,9 @@ void DivPlatformSID3::tick(bool sysTick)
}
if (chan[i].freq<0) chan[i].freq=0;
if (chan[i].freq>0x1ffff) chan[i].freq=0x1ffff;
if (chan[i].freq>0xffffff) chan[i].freq=0xffffff;
updateFreq(i);
//rWrite(i*7,chan[i].freq&0xff);
//rWrite(i*7+1,chan[i].freq>>8);

2
src/engine/platform/sid3.h
View file

@ -81,6 +81,8 @@ class DivPlatformSID3: public DivDispatch {
friend void putDispatchChan(void*,int,int);
void updateFilter(int channel);
void updateFreq(int channel);
void updateDuty(int channel);
public:
void acquire(short** buf, size_t len);
int dispatch(DivCommand c);

126
src/engine/platform/sound/sid3.c
View file

@ -159,6 +159,8 @@ SID3* sid3_create()
{
SID3* sid3 = (SID3*)malloc(sizeof(SID3));
memset(sid3, 0, sizeof(SID3));
for(int i = 0; i < SID3_NUM_SPECIAL_WAVES; i++)
{
for(int j = 0; j < SID3_SPECIAL_WAVE_LENGTH; j++)
@ -182,7 +184,8 @@ void sid3_reset(SID3* sid3)
sid3->chan[i].adsr.d = 0x8;
sid3->chan[i].adsr.s = 0x80;
sid3->chan[i].adsr.r = 0x07;
sid3->chan[i].adsr.vol = 0x20;
sid3->chan[i].adsr.vol = 0xf0;
sid3->chan[i].adsr.hold_zero = true;
//....
}
@ -325,7 +328,7 @@ void sid3_adsr_clock(sid3_channel_adsr* adsr)
int sid3_adsr_output(sid3_channel_adsr* adsr, int input)
{
return (int)(input * ((int64_t)adsr->envelope_counter * (int64_t)adsr->vol / (int64_t)SID3_MAX_VOL));
return (int)((int64_t)input * (int64_t)adsr->envelope_counter * (int64_t)adsr->vol / (int64_t)SID3_MAX_VOL);
}
void sid3_write(SID3* sid3, uint8_t address, uint8_t data)
@ -462,6 +465,93 @@ void sid3_write(SID3* sid3, uint8_t address, uint8_t data)
}
break;
}
case 10:
{
if(channel != SID3_NUM_CHANNELS - 1)
{
sid3->chan[channel].frequency &= 0x00ffff;
sid3->chan[channel].frequency |= data << 16;
}
else
{
sid3->wave_chan.frequency &= 0x00ffff;
sid3->wave_chan.frequency |= data << 16;
}
break;
}
case 11:
{
if(channel != SID3_NUM_CHANNELS - 1)
{
sid3->chan[channel].frequency &= 0xff00ff;
sid3->chan[channel].frequency |= data << 8;
}
else
{
sid3->wave_chan.frequency &= 0xff00ff;
sid3->wave_chan.frequency |= data << 8;
}
break;
}
case 12:
{
if(channel != SID3_NUM_CHANNELS - 1)
{
sid3->chan[channel].frequency &= 0xffff00;
sid3->chan[channel].frequency |= data;
}
else
{
sid3->wave_chan.frequency &= 0xffff00;
sid3->wave_chan.frequency |= data;
}
break;
}
default: break;
}
}
uint16_t sid3_pulse(uint32_t acc, uint16_t pw) // 0-FFFF pulse width range
{
return (((acc >> ((SID3_ACC_BITS - 16))) >= ((pw == 0xffff ? pw + 1 : pw)) ? (0xffff) : 0));
}
uint16_t sid3_saw(uint32_t acc)
{
return (acc >> (SID3_ACC_BITS - 16)) & (0xffff);
}
uint16_t sid3_triangle(uint32_t acc)
{
return (((acc < (1 << (SID3_ACC_BITS - 1))) ? ~acc : acc) >> (SID3_ACC_BITS - 17));
}
uint16_t sid3_get_waveform(sid3_channel* ch)
{
switch(ch->mix_mode)
{
case SID3_MIX_8580:
{
switch(ch->waveform)
{
case SID3_WAVE_TRIANGLE:
{
return sid3_triangle(ch->accumulator);
break;
}
case SID3_WAVE_SAW:
{
return sid3_saw(ch->accumulator);
break;
}
case SID3_WAVE_PULSE:
{
return sid3_pulse(ch->accumulator, ch->pw);
break;
}
}
break;
}
default: break;
}
}
@ -470,13 +560,37 @@ void sid3_clock(SID3* sid3)
{
SAFETY_HEADER
sid3->output_l = sid3->output_r = 0;
for(int i = 0; i < SID3_NUM_CHANNELS - 1; i++)
{
sid3_adsr_clock(&sid3->chan[i].adsr);
sid3->output_l = sid3_adsr_output(&sid3->chan[i].adsr, 0xff);
sid3->output_r = sid3_adsr_output(&sid3->chan[i].adsr, 0xff);
sid3_channel* ch = &sid3->chan[i];
uint32_t prev_acc = ch->accumulator;
sid3->channel_output[i] = sid3_adsr_output(&sid3->chan[i].adsr, 0xff);
ch->accumulator += ch->frequency;
if(ch->accumulator & (1 << SID3_ACC_BITS))
{
ch->sync_bit = 1;
}
else
{
ch->sync_bit = 0;
}
ch->accumulator &= SID3_ACC_MASK;
//todo: phase mod
int waveform = sid3_get_waveform(ch);
waveform -= 0x7fff;
sid3_adsr_clock(&ch->adsr);
sid3->output_l += sid3_adsr_output(&ch->adsr, waveform / 1024);
sid3->output_r += sid3_adsr_output(&ch->adsr, waveform / 1024);
sid3->channel_output[i] = sid3_adsr_output(&ch->adsr, waveform / 1024);
}
}

5
src/engine/platform/sound/sid3.h
View file

@ -21,6 +21,9 @@ extern "C" {
#define SID3_NUM_SPECIAL_WAVES 28
#define SID3_SPECIAL_WAVE_LENGTH 16384
#define SID3_ACC_BITS 30
#define SID3_ACC_MASK ((1UL << SID3_ACC_BITS) - 1)
enum Flags
{
SID3_CHAN_ENABLE_GATE = 1,
@ -95,6 +98,7 @@ typedef struct
typedef struct
{
uint32_t accumulator;
uint8_t sync_bit;
uint32_t frequency;
uint32_t noise_accumulator;
@ -125,6 +129,7 @@ typedef struct
typedef struct
{
uint32_t accumulator;
uint8_t sync_bit;
uint32_t frequency;
uint16_t streamed_sample;