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use super::{
mem, FactoryParameters, GenBox, GenFactoryError, Generator, GeneratorFactory, ParamValue,
Parameters, Rate, SampleBuffer,
};
#[derive(Debug)]
pub struct Square {
pub freq: GenBox,
pub phase: f32,
pub buf: SampleBuffer,
}
impl Generator for Square {
fn eval<'a>(&'a mut self, params: &Parameters) -> &'a SampleBuffer {
self.buf.rate = Rate::Sample;
let pvel = self.freq.eval(params).first() / params.env.sample_rate;
for i in 0..self.buf.len() {
self.buf[i] = if ((self.phase + pvel * (i as f32)) % 1.0) < 0.5 {
-1.0
} else {
1.0
};
}
self.phase = (self.phase + pvel * (self.buf.len() as f32)) % 1.0;
&self.buf
}
fn buffer(&self) -> &SampleBuffer {
&self.buf
}
fn set_buffer(&mut self, buf: SampleBuffer) -> SampleBuffer {
mem::replace(&mut self.buf, buf)
}
}
pub struct SquareFactory;
impl GeneratorFactory for SquareFactory {
fn new(&self, params: &mut FactoryParameters) -> Result<GenBox, GenFactoryError> {
Ok(Box::new(Square {
freq: params.remove_param("freq", 0)?.into_gen()?,
phase: params
.get_param("phase", 1, &mut ParamValue::Float(0.0))
.as_f32()?,
buf: SampleBuffer::new(params.env.default_buffer_size),
}))
}
}
pub static Factory: SquareFactory = SquareFactory;
|
