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use super::{
FactoryParameters, GenBox, GenFactoryError, Generator, GeneratorFactory, Parameters, Rate,
SampleBuffer,
};
use std::{cmp, mem};
#[derive(Debug)]
pub struct IfElse {
pub cond: GenBox,
pub iftrue: GenBox,
pub iffalse: GenBox,
pub buf: SampleBuffer,
}
impl Generator for IfElse {
fn eval<'a>(&'a mut self, params: &Parameters) -> &'a SampleBuffer {
let cond_buf = self.cond.eval(params);
let iftrue_buf = self.iftrue.eval(params);
let iffalse_buf = self.iffalse.eval(params);
if cond_buf.rate == Rate::Control
&& iftrue_buf.rate == Rate::Control
&& iffalse_buf.rate == Rate::Control
{
self.buf.set(if cond_buf.first() >= 0.5 {
iftrue_buf.first()
} else {
iffalse_buf.first()
});
return &self.buf;
}
self.buf.rate = Rate::Sample;
let mut bound = self.buf.len();
if cond_buf.rate == Rate::Sample {
bound = cmp::min(bound, cond_buf.len());
}
if iftrue_buf.rate == Rate::Sample {
bound = cmp::min(bound, iftrue_buf.len());
}
if iffalse_buf.rate == Rate::Sample {
bound = cmp::min(bound, iffalse_buf.len());
}
for i in 0..bound {
let tv = match iftrue_buf.rate {
Rate::Sample => iftrue_buf[i],
Rate::Control => iftrue_buf.first(),
};
let fv = match iffalse_buf.rate {
Rate::Sample => iffalse_buf[i],
Rate::Control => iffalse_buf.first(),
};
let cv = match cond_buf.rate {
Rate::Sample => cond_buf[i],
Rate::Control => cond_buf.first(),
};
self.buf[i] = if cv >= 0.5 { tv } else { fv };
}
&self.buf
}
fn buffer(&self) -> &SampleBuffer {
&self.buf
}
fn set_buffer(&mut self, buf: SampleBuffer) -> SampleBuffer {
mem::replace(&mut self.buf, buf)
}
}
pub struct IfElseFactory;
impl GeneratorFactory for IfElseFactory {
fn new(&self, params: &mut FactoryParameters) -> Result<GenBox, GenFactoryError> {
let cond = params.remove_param("cond", 0)?.into_gen()?;
let iftrue = params.remove_param("iftrue", 1)?.into_gen()?;
let iffalse = params.remove_param("iffalse", 2)?.into_gen()?;
let buf = SampleBuffer::new(cmp::max(
cmp::max(cond.buffer().len(), iftrue.buffer().len()),
iffalse.buffer().len(),
));
Ok(Box::new(IfElse {
cond: cond,
iftrue: iftrue,
iffalse: iffalse,
buf: buf,
}))
}
}
pub static Factory: IfElseFactory = IfElseFactory;
|
