#include "Instrument.h" #include "waveforms/Sawtooth.h" #include "waveforms/Sine.h" #include "waveforms/Square.h" #include "waveforms/Triangle.h" Instrument::Instrument(AudioHost *host) { this->host = host; wave = new Sine(); wave->host = host; envelope->initialize(host); lowPass->host = host; } void multiply(float *target, float *modulation, uint32_t size) { for (uint32_t i = 0; i < size; i++) { target[i] *= modulation[i]; } } void add(float *target, float *other, uint32_t size) { for (uint32_t i = 0; i < size; i++) { target[i] += other[i]; } } void Instrument::render(float *buffer, uint32_t count) { float *modulation = envelope->render(count); float *waveform = wave->render(count); multiply(waveform, modulation, count); lowPass->input = waveform; float *filtered = lowPass->render(count); add(buffer, filtered, count); } void Instrument::startNote(float frequency) { wave->setFrequency(frequency); envelope->startNote(); lowPass->frequency = frequency; lowPass->update(); } void Instrument::endNote() { envelope->endNote(); } void Instrument::setWaveform(WaveformType waveform) { Waveform *old = wave; switch (waveform) { case SINE: wave = new Sine(); break; case SAWTOOTH: wave = new Sawtooth(); break; case SQUARE: wave = new Square(); break; case TRIANGLE: wave = new Triangle(); } wave->host = host; delete old; }