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works for frames > updateFrames

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This commit is contained in:
Gordon JC Pearce 2024-09-04 21:08:27 +01:00
parent 44feac5e0b
commit 98ab957faf
4 changed files with 86 additions and 22 deletions
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56
plugin/chassis.cpp
View File

@ -20,14 +20,14 @@
START_NAMESPACE_DISTRHO
Chassis::Chassis() : Plugin(kParameterCount, 0, 0) { // one parameter, no programs, no states
Chassis::Chassis() : Plugin(kParameterCount, 0, 0), sampleRate(getSampleRate()) { // one parameter, no programs, no states
}
// Initialisation functions
void Chassis::initParameter(uint32_t index, Parameter &parameter) {
switch (index) {
case k_saw:
case k_saw:
parameter.hints = kParameterIsAutomatable | kParameterIsBoolean;
parameter.name = "Saw";
parameter.symbol = "saw";
@ -36,7 +36,7 @@ void Chassis::initParameter(uint32_t index, Parameter &parameter) {
parameter.ranges.def = 0.0f;
break;
case k_sqr:
case k_sqr:
parameter.hints = kParameterIsAutomatable | kParameterIsBoolean;
parameter.name = "Square";
parameter.symbol = "sqr";
@ -44,8 +44,16 @@ void Chassis::initParameter(uint32_t index, Parameter &parameter) {
parameter.ranges.max = 127.0f;
parameter.ranges.def = 0.0f;
break;
case k_sub:
parameter.hints = kParameterIsAutomatable | kParameterIsBoolean;
parameter.name = "Sub Osc";
parameter.symbol = "sub";
parameter.ranges.min = 0.0f;
parameter.ranges.max = 127.0f;
parameter.ranges.def = 0.0f;
break;
}
}
void Chassis::setParameterValue(uint32_t index, float value) {
@ -53,11 +61,12 @@ void Chassis::setParameterValue(uint32_t index, float value) {
case k_saw:
s.p.saw = value / 127.0f;
break;
case k_sqr:
case k_sqr:
s.p.sqr = value / 127.0f;
break;
case k_sub:
s.p.sub = value / 127.0f;
break;
}
}
@ -86,8 +95,11 @@ void Chassis::loadProgram(uint32_t index) {
// Processing functions
void Chassis::activate() {
// calculate filter coefficients
// calculate filter coefficients and stuff
printf("called activate()\n");
s.updateLength = sampleRate / 238; // update rate in Hz;
printf("update length is %d for %dHz sample rate\n", s.updateLength, (int)sampleRate);
//s.samplesLeft = s.updateLength;
}
void Chassis::deactivate() {
@ -107,6 +119,7 @@ void Chassis::noteOn(uint8_t note) {
break;
}
}
if (i == NUM_VOICES) { // didn't find a free voice
vPtr++;
if (vPtr == NUM_VOICES) vPtr = 0;
@ -125,8 +138,32 @@ void Chassis::noteOff(uint8_t note) {
void Chassis::run(const float **, float **outputs, uint32_t frames, const MidiEvent *MidiEvents, uint32_t midiEventCount) {
// if (midiEventCount > 0) printf("\n--------------------\n");
//uint32_t framesDone = 0;
/*
if (s.samplesLeft == 0) {
printf("resetting s.samplesLeft to %d\n", frames);
s.samplesLeft = frames;
}*/
printf("in run(%d), samplesLeft = %d\n", frames, s.samplesLeft);
s.samplesLeft = frames;
do {
printf("doing %d frames %d\n", s.updateLength, s.samplesLeft);
s.samplesLeft -= s.updateLength;
} while (s.samplesLeft > s.updateLength);
printf("doing %d frames %d\n", s.samplesLeft, s.samplesLeft);
s.samplesLeft = s.updateLength - s.samplesLeft;
printf("done with all that, %d\n", s.samplesLeft);
for (uint32_t i = 0; i < midiEventCount; i++) {
// printf("%4d %02x %02x\n", MidiEvents[i].frame, MidiEvents[i].data[0], MidiEvents[i].data[1]);
if (MidiEvents[i].data[0] == 0x90) {
noteOn(MidiEvents[i].data[1]);
}
@ -140,6 +177,7 @@ void Chassis::run(const float **, float **outputs, uint32_t frames, const MidiEv
for (uint8_t i = 0; i < NUM_VOICES; i++) {
s.voice[i].run(s, outputs[0], frames);
}
s.lastpw = s.lfo;
// copy left to right
memmove(outputs[1], outputs[0], sizeof(float) * frames);
}

2
plugin/chassis.hpp
View File

@ -31,6 +31,7 @@ class Chassis : public Plugin {
enum Parameters {
k_saw,
k_sqr,
k_sub,
kParameterCount
};
@ -65,6 +66,7 @@ class Chassis : public Plugin {
void noteOff(uint8_t note);
private:
double sampleRate;
// Voice voice[NUM_VOICES];
uint8_t vPtr;

29
plugin/voice.cpp
View File

@ -55,14 +55,35 @@ void Voice::off() {
}
void Voice::run(Synth &s, float *buffer, uint32_t samples) {
float y;
float y, offset, pw = 0;
env = ((target - env) * 0.01) + env;
pw = 0.5 - s.lfo * 0.4;
// s.p.sqr=1;
for (uint32_t i = 0; i < samples; i++) {
// sawtooth
y = 1 - (2 * phase);
y += blep(phase, omega);
// need this if either saw or square is on;
y *= (s.p.saw + s.p.sqr);
// bodged for 16ms 48000Hz
pw_rc = ((pw - pw_rc) * 0.000625) + pw_rc;
// phase shifted saw
offset = phase + pw_rc;
if (offset > 1) offset -= 1;
y -= (1 - (2 * offset)) * s.p.sqr;
y -= blep(offset, omega + (pw_rc - s.lastpw)) * s.p.sqr;
//s.lastpw = pw_rc;
buffer[i] += (0.125 * y * env);
phase += omega;
if (phase > 1) phase -= 1;
y = (2 * phase) - 1;
y -= blep(phase, omega);
buffer[i] += (0.25 * y * env) * s.p.saw;
}
}

21
plugin/voice.hpp
View File

@ -23,9 +23,8 @@
class Synth;
class Patch {
public:
float saw,sqr;
public:
float saw, sqr, sub;
};
class Voice {
@ -48,14 +47,18 @@ class Voice {
enum { K_OFF,
K_ON,
K_SUSTAIN } keyState = K_OFF;
float phase, omega;
float phase = 0, omega = 260 / 48000.0;
float env, target;
float out, delay;
float pw_rc = 0;
};
class Synth {
public:
Patch p;
Voice voice[8];
public:
Patch p;
Voice voice[8];
float lfo = 0, lfosw = 0.01;
float lastpw = 0;
uint32_t updateLength;
uint32_t samplesLeft = 0;
};