otomatalabs/furnace
8
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

wavetables and samples for SID3! (unfinished)

Browse source
This commit is contained in:
LTVA1 2024-08-09 14:30:45 +03:00
parent 2a322bff4f
commit 6bf391b4bc
9 changed files with 522 additions and 86 deletions
Download patch file Download diff file Expand all files Collapse all files

220
src/engine/platform/sound/sid3.c
View file

@ -2879,6 +2879,105 @@ int32_t sid3_process_filters_block(sid3_channel* ch)
return output;
}
int32_t sid3_process_wave_channel_filters_block(sid3_wavetable_chan* ch)
{
int32_t output = 0;
ch->clock_filter++;
if(ch->clock_filter & 1)
{
for(uint8_t i = 0; i < SID3_NUM_FILTERS; i++)
{
if(ch->filt.filt[i].mode & SID3_FILTER_OUTPUT)
{
output += ch->filt.filt[i].output;
}
}
return output;
}
for(uint8_t i = 0; i < SID3_NUM_FILTERS; i++)
{
ch->filt.filt[i].input = 0;
}
for(uint8_t i = 0; i < SID3_NUM_FILTERS; i++)
{
if(ch->filt.filt[i].mode & SID3_FILTER_CHANNEL_INPUT)
{
ch->filt.filt[i].input += ch->output_before_filter;
}
for(uint8_t j = 0; j < SID3_NUM_FILTERS; j++)
{
if(ch->filt.connection_matrix[i] & (1 << j))
{
ch->filt.filt[i].input += ch->filt.filt[j].output;
}
}
}
for(uint8_t i = 0; i < SID3_NUM_FILTERS; i++)
{
if(ch->filt.filt[i].mode & SID3_FILTER_ENABLE)
{
float Vi = ch->filt.filt[i].input;
float dVbp = (ch->filt.filt[i].w0_ceil_1 * ch->filt.filt[i].Vhp);
float dVlp = (ch->filt.filt[i].w0_ceil_1 * ch->filt.filt[i].Vbp);
ch->filt.filt[i].Vbp += dVbp;
ch->filt.filt[i].Vlp += dVlp;
ch->filt.filt[i].Vhp = Vi - ch->filt.filt[i].Vlp - (ch->filt.filt[i].Vbp * ch->filt.filt[i]._1024_div_Q);
float Vo;
switch(ch->filt.filt[i].mode & SID3_FILTER_MODES_MASK)
{
case 0x0:
default:
Vo = 0;
break;
case SID3_FILTER_LP:
Vo = ch->filt.filt[i].Vlp;
break;
case SID3_FILTER_HP:
Vo = ch->filt.filt[i].Vhp;
break;
case SID3_FILTER_LP | SID3_FILTER_HP:
Vo = ch->filt.filt[i].Vlp + ch->filt.filt[i].Vhp;
break;
case SID3_FILTER_BP:
Vo = ch->filt.filt[i].Vbp;
break;
case SID3_FILTER_BP | SID3_FILTER_LP:
Vo = ch->filt.filt[i].Vlp + ch->filt.filt[i].Vbp;
break;
case SID3_FILTER_BP | SID3_FILTER_HP:
Vo = ch->filt.filt[i].Vhp + ch->filt.filt[i].Vbp;
break;
case SID3_FILTER_BP | SID3_FILTER_HP | SID3_FILTER_LP:
Vo = ch->filt.filt[i].Vlp + ch->filt.filt[i].Vbp + ch->filt.filt[i].Vhp;
break;
}
ch->filt.filt[i].output = Vo * ch->filt.filt[i].output_volume / 0xff;
}
else
{
ch->filt.filt[i].output = 0;
}
if(ch->filt.filt[i].mode & SID3_FILTER_OUTPUT)
{
output += ch->filt.filt[i].output;
}
}
return output;
}
void sid3_clock(SID3* sid3)
{
//SAFETY_HEADER
@ -2978,6 +3077,94 @@ void sid3_clock(SID3* sid3)
sid3->channel_output[i] = output;
}
//wavetable/streamed PCM sample channel:
sid3_wavetable_chan* ch = &sid3->wave_chan;
uint32_t prev_acc = ch->accumulator;
ch->accumulator += ch->frequency;
ch->sync_bit = 0;
if(ch->accumulator & (1 << SID3_ACC_BITS))
{
ch->sync_bit = 1;
}
if(ch->flags & SID3_CHAN_ENABLE_HARD_SYNC)
{
if(ch->hard_sync_src == SID3_NUM_CHANNELS - 1) //wave chan
{
if(sid3->wave_chan.sync_bit)
{
ch->accumulator = 0;
}
}
else
{
if(sid3->chan[ch->hard_sync_src].sync_bit)
{
ch->accumulator = 0;
}
}
}
uint32_t acc_state = ch->accumulator;
if(ch->flags & SID3_CHAN_ENABLE_PHASE_MOD)
{
ch->accumulator += ch->phase_mod_source == SID3_NUM_CHANNELS - 1 ? ((uint64_t)sid3->wave_channel_output << 18) : ((uint64_t)sid3->channel_output[ch->phase_mod_source] << 18);
}
ch->accumulator &= SID3_ACC_MASK;
int32_t waveform;
if(ch->mode)
{
waveform = (int32_t)ch->streamed_sample - 0x7fff;
}
else
{
waveform = ((int32_t)ch->wavetable[(ch->accumulator & SID3_ACC_MASK) >> (SID3_ACC_BITS - 8)] << 8) - 0x7fff;
}
ch->accumulator = acc_state & SID3_ACC_MASK;
sid3->wave_channel_signal_before_ADSR = waveform;
if(ch->flags & SID3_CHAN_ENABLE_RING_MOD)
{
uint8_t ring_mod_src = ch->ring_mod_src == SID3_NUM_CHANNELS ? 0xff : ch->ring_mod_src; //SID3_NUM_CHANNELS = self-mod
waveform = waveform * (ch->ring_mod_src == 0xff ? sid3->wave_channel_signal_before_ADSR : sid3->channel_signals_before_ADSR[ring_mod_src]) / (int32_t)0xffff; //ring modulation is just multiplication of two signals!
}
sid3_adsr_clock(&ch->adsr);
ch->output_before_filter = sid3_adsr_output(sid3, &ch->adsr, waveform);
int32_t output = 0;
if((ch->filt.filt[0].mode & SID3_FILTER_ENABLE) || (ch->filt.filt[1].mode & SID3_FILTER_ENABLE) ||
(ch->filt.filt[2].mode & SID3_FILTER_ENABLE) || (ch->filt.filt[3].mode & SID3_FILTER_ENABLE))
{
output = sid3_process_wave_channel_filters_block(ch);
}
else
{
output = ch->output_before_filter;
}
if(!sid3->muted[SID3_NUM_CHANNELS - 1])
{
sid3->output_l += output * ch->panning_left / 0x8f0;
sid3->output_r += output * ch->panning_right / 0x8f0;
}
sid3->wave_channel_output = output;
}
void sid3_write(SID3* sid3, uint16_t address, uint8_t data)
@ -3027,7 +3214,7 @@ void sid3_write(SID3* sid3, uint16_t address, uint8_t data)
}
else
{
uint8_t prev_flags = sid3->chan[channel].flags;
uint8_t prev_flags = sid3->wave_chan.flags;
sid3->wave_chan.flags = data;
if((prev_flags & SID3_CHAN_ENABLE_GATE) != (sid3->wave_chan.flags & SID3_CHAN_ENABLE_GATE))
@ -3035,6 +3222,19 @@ void sid3_write(SID3* sid3, uint16_t address, uint8_t data)
sid3_gate_bit(sid3, sid3->wave_chan.flags & SID3_CHAN_ENABLE_GATE, &sid3->wave_chan.adsr);
}
if(sid3->wave_chan.flags & SID3_CHAN_ENV_RESET)
{
sid3->wave_chan.adsr.envelope_counter = 0;
sid3->wave_chan.adsr.state = ATTACK;
sid3->wave_chan.adsr.envelope_speed = envspd_a(sid3->wave_chan.adsr.a);
sid3->wave_chan.adsr.hold_zero = false;
}
if(sid3->wave_chan.flags & SID3_CHAN_PHASE_RESET)
{
sid3->wave_chan.accumulator = 0;
}
sid3->wave_chan.flags &= ~(SID3_CHAN_ENV_RESET | SID3_CHAN_NOISE_PHASE_RESET | SID3_CHAN_PHASE_RESET);
}
break;
@ -3477,6 +3677,24 @@ void sid3_write(SID3* sid3, uint16_t address, uint8_t data)
}
break;
}
case SID3_REGISTER_STREAMED_SAMPLE_HIGH:
{
if(channel == SID3_NUM_CHANNELS - 1)
{
sid3->wave_chan.streamed_sample &= 0x00ff;
sid3->wave_chan.streamed_sample |= data << 8;
}
break;
}
case SID3_REGISTER_STREAMED_SAMPLE_LOW:
{
if(channel == SID3_NUM_CHANNELS - 1)
{
sid3->wave_chan.streamed_sample &= 0xff00;
sid3->wave_chan.streamed_sample |= data;
}
break;
}
default: break;
}
}

3
src/engine/platform/sound/sid3.h
View file

@ -124,6 +124,9 @@ enum Registers
SID3_REGISTER_NOISE_LFSR_HIGH = SID3_REGISTER_AFTER_FILT_1ST_REG + 7,
SID3_REGISTER_NOISE_LFSR_MID = SID3_REGISTER_AFTER_FILT_1ST_REG + 8,
SID3_REGISTER_NOISE_LFSR_LOW = SID3_REGISTER_AFTER_FILT_1ST_REG + 9,
SID3_REGISTER_STREAMED_SAMPLE_HIGH = SID3_REGISTER_AFTER_FILT_1ST_REG + 10,
SID3_REGISTER_STREAMED_SAMPLE_LOW = SID3_REGISTER_AFTER_FILT_1ST_REG + 11,
};
typedef struct