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approximately a filter

This commit is contained in:
Gordon JC Pearce 2025-12-18 00:44:55 +00:00
parent 88230d862d
commit ca0afc5d3d
2 changed files with 20 additions and 2 deletions
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4
plugin/module.hpp
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@ -75,6 +75,10 @@ class Voice {
float delay = 0, lastpw = 0; // delay slots for antialiasing
uint8_t pulseStage = 1; // pulse wave phase
float subosc = 1; // sub oscillator flipflop output
// filter
float b1=0, b2=0, b3=0, b4=0;
};
#endif

18
plugin/voice.cpp
View File

@ -49,8 +49,9 @@ void Voice::off() {
void Voice::run(Module* m, float* buffer, uint32_t samples) {
// carry out per-voice calculations for each block of samples
float out, t;
float out, t, fb, res;
float cut = 0.00513 + 0.075*env;
// printf("%f ", delay);
m->saw = 1;
m->square = 1;
@ -92,7 +93,20 @@ void Voice::run(Module* m, float* buffer, uint32_t samples) {
delay += m->sub * subosc;
// delay += (1-(m->noisegen/(float)(1<<30))) * m->noise; FIXME figure out what to do about noise
buffer[i] += 0.125 * env * out;
for (uint8_t ovs = 0; ovs < 4; ovs++) {
fb = b4;
// hard clip
if (fb > 1) fb = 1;
if (fb < -1) fb = -1;
fb = out - (fb * 2);
b1 = ((fb - b1) * cut) + b1;
b2 = ((b1 - b2) * cut) + b2;
b3 = ((b2 - b3) * cut) + b3;
b4 = ((b3 - b4) * cut) + b4;
}
buffer[i] += 0.125 * env * b4;
lastpw = m->pw;
}
// buffer[0] += 1;