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/**
bespoke synth, a software modular synthesizer
Copyright (C) 2021 Ryan Challinor (contact: awwbees@gmail.com)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
**/
//
// GateEffect.cpp
// modularSynth
//
// Created by Ryan Challinor on 4/19/13.
//
//
#include "GateEffect.h"
#include "SynthGlobals.h"
#include "Profiler.h"
GateEffect::GateEffect()
{
}
void GateEffect::CreateUIControls()
{
IDrawableModule::CreateUIControls();
mThresholdSlider = new FloatSlider(this, "threshold", 5, 2, 110, 15, &mThreshold, 0, 1);
mAttackSlider = new FloatSlider(this, "attack", 5, 18, 110, 15, &mAttackTime, .1f, 500);
mReleaseSlider = new FloatSlider(this, "release", 5, 34, 110, 15, &mReleaseTime, .1f, 500);
mThresholdSlider->SetMode(FloatSlider::kSquare);
}
void GateEffect::ProcessAudio(double time, ChannelBuffer* buffer)
{
PROFILER(GateEffect);
if (!mEnabled)
return;
float bufferSize = buffer->BufferSize();
ComputeSliders(0);
for (int i = 0; i < bufferSize; ++i)
{
const float decayTime = .01f;
float scalar = powf(0.5f, 1.0f / (decayTime * gSampleRate));
float input = 0;
for (int ch = 0; ch < buffer->NumActiveChannels(); ++ch)
input = MAX(input, fabsf(buffer->GetChannel(ch)[i]));
if (input >= mPeak)
{
/* When we hit a peak, ride the peak to the top. */
mPeak = input;
}
else
{
/* Exponential decay of output when signal is low. */
mPeak = mPeak * scalar;
if (mPeak < FLT_EPSILON)
mPeak = 0.0;
}
if (mPeak >= mThreshold && mEnvelope < 1)
mEnvelope = MIN(1, mEnvelope + gInvSampleRateMs / mAttackTime);
if (mPeak < mThreshold && mEnvelope > 0)
mEnvelope = MAX(0, mEnvelope - gInvSampleRateMs / mReleaseTime);
for (int ch = 0; ch < buffer->NumActiveChannels(); ++ch)
buffer->GetChannel(ch)[i] *= mEnvelope;
time += gInvSampleRateMs;
}
}
void GateEffect::DrawModule()
{
mThresholdSlider->Draw();
mAttackSlider->Draw();
mReleaseSlider->Draw();
ofPushStyle();
ofFill();
ofSetColor(0, 255, 0, gModuleDrawAlpha * .4f);
ofRect(5, 2, 110 * sqrtf(mPeak), 7);
ofSetColor(255, 0, 0, gModuleDrawAlpha * .4f);
ofRect(5, 9, 110 * mEnvelope, 7);
ofPopStyle();
}
void GateEffect::CheckboxUpdated(Checkbox* checkbox, double time)
{
}
void GateEffect::IntSliderUpdated(IntSlider* slider, int oldVal, double time)
{
}
void GateEffect::FloatSliderUpdated(FloatSlider* slider, float oldVal, double time)
{
}
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