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feat: add basic lp filter

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This commit is contained in:
Liam Kerr 2026-08-05 13:46:12 +01:00
parent 2bd91c7d8e
commit 75843a7309
4 changed files with 134 additions and 9 deletions
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59
plugins/SquidgeDistortion/SquidgeDistortion.cpp
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@ -3,6 +3,7 @@
#include "DistrhoPluginInfo.h"
#include "../../core/Clipper.hpp"
#include "../../core/Filter.hpp"
#include "../../core/Gain.hpp"
#include "../../core/Mixer.hpp"
@ -10,6 +11,13 @@ START_NAMESPACE_DISTRHO
const int BUFFER_SIZE = 16384;
struct AudioBuffers {
float clippedL[BUFFER_SIZE];
float clippedR[BUFFER_SIZE];
float lpL[BUFFER_SIZE];
float lpR[BUFFER_SIZE];
};
class SquidgeDistortion : public Plugin {
public:
@ -17,11 +25,13 @@ public:
enum Parameters {
kParamGain,
kParamClipMode,
kParamFilter,
kParamFilterFeedback,
kParamMixVolume,
kParameterCount // must be last
};
SquidgeDistortion()
: Plugin(kParameterCount, 0, 0), gain_(2.0f), mixer_(1.0f) {
: Plugin(kParameterCount, 0, 0), gain_(2.0f), mixer_(1.0f), filter_(440) {
mixer_.setInputGain(kChannelDry, 0.0f);
mixer_.setInputGain(kChannelWet, 1.0f);
}
@ -62,6 +72,22 @@ protected:
parameter.enumValues.values =
const_cast<ParameterEnumerationValue *>(sClipModes);
break;
case kParamFilter:
parameter.name = "Filter";
parameter.symbol = "filter";
parameter.ranges.min = 20.0f;
parameter.ranges.def = 1000.0f;
parameter.ranges.max = 10000.0f;
parameter.hints = kParameterIsAutomatable;
break;
case kParamFilterFeedback:
parameter.name = "Filter Feedback";
parameter.symbol = "filterfeedback";
parameter.ranges.min = 0.0f;
parameter.ranges.def = .1f;
parameter.ranges.max = 0.99f;
parameter.hints = kParameterIsAutomatable;
break;
case kParamMixVolume:
parameter.name = "Dry/Wet";
parameter.symbol = "drywetvolume";
@ -79,6 +105,10 @@ protected:
return gain_.getGain();
case kParamClipMode:
return (float)clipper_.getMode();
case kParamFilter:
return (float)filter_.getCutOff();
case kParamFilterFeedback:
return (float)filter_.getFeedback();
case kParamMixVolume:
return mixer_.getInputGain(kChannelWet);
}
@ -93,6 +123,12 @@ protected:
case kParamClipMode:
clipper_.setMode((Clipper::ClipperMode)value);
break;
case kParamFilter:
filter_.setCutOff(value);
break;
case kParamFilterFeedback:
filter_.setFeedback(value);
break;
case kParamMixVolume:
mixer_.setInputGain(kChannelWet, value);
mixer_.setInputGain(kChannelDry, 1.0f - value);
@ -108,22 +144,29 @@ protected:
}
return;
}
gain_.processStereo(inputs[0], inputs[1], wetBufferL_, wetBufferR_, frames);
clipper_.processStereo(wetBufferL_, wetBufferR_, wetBufferL_, wetBufferR_,
frames);
gain_.processStereo(inputs[0], inputs[1], buffers_.clippedL,
buffers_.clippedR, frames);
clipper_.processStereo(buffers_.clippedL, buffers_.clippedR,
buffers_.clippedL, buffers_.clippedR, frames);
filter_.processStereo(buffers_.clippedL, buffers_.clippedR, buffers_.lpL,
buffers_.lpR, frames);
const float *inputsL[2] = {inputs[0], wetBufferL_};
const float *inputsR[2] = {inputs[1], wetBufferR_};
const float *inputsL[2] = {inputs[0], buffers_.lpL};
const float *inputsR[2] = {inputs[1], buffers_.lpR};
mixer_.processStereo(inputsL, inputsR, outputs[0], outputs[1], frames);
}
void sampleRateChanged(double newSr) override {
filter_.setSampleRate(static_cast<float>(newSr));
}
private:
Gain gain_;
Clipper clipper_;
Mixer<2> mixer_;
float wetBufferL_[BUFFER_SIZE];
float wetBufferR_[BUFFER_SIZE];
Filter filter_;
AudioBuffers buffers_;
DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(SquidgeDistortion);
};