46 lines
1.1 KiB
Rust
46 lines
1.1 KiB
Rust
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use std::sync::{Arc, Mutex, RwLock};
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use log::warn;
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use sdl2::audio::AudioCallback;
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pub struct SquareWave {
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sound_timer: Arc<Mutex<u8>>,
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phase_inc: f32,
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phase: f32,
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volume: f32,
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}
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impl SquareWave {
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pub fn new(sound_timer: Arc<Mutex<u8>>,
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phase_inc: f32,
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volume: f32)->SquareWave {
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SquareWave {
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sound_timer,
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phase: 0f32,
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phase_inc,
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volume,
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}
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}
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}
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impl AudioCallback for SquareWave {
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type Channel = f32;
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fn callback(&mut self, out: &mut [f32]) {
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let sound_timer = self.sound_timer.lock().expect("Could not lock to play audio");
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let sound_timer = sound_timer.clone();
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// log::info!("Processing audio buffer length {}",out.len());
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// Generate a square wave
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for x in out.iter_mut() {
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*x = if sound_timer > 0 {
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if self.phase <= 0.5 {
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self.volume
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} else {
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-self.volume
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}
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} else {
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0f32
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};
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self.phase = (self.phase + self.phase_inc) % 1.0;
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}
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}
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}
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