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|
use std::{cmp, mem};
use super::*;
#[derive(Debug)]
pub enum RelOp {
Greater,
GreaterEqual,
Equal,
NotEqual,
LessEqual,
Less,
}
impl RelOp {
pub fn to_param_string(&self) -> &'static str {
match *self {
RelOp::Greater => ">",
RelOp::GreaterEqual => ">=",
RelOp::Equal => "==",
RelOp::NotEqual => "!=",
RelOp::LessEqual => "<=",
RelOp::Less => "<",
}
}
}
/* TODO
impl<T: PartialEq<isize>> From<T> for RelOp {
fn from(i: T) -> RelOp {
match i {
0 => RelOp::Greater,
1 => RelOp::GreaterEqual,
_ => RelOp::Equal,
3 => RelOp::NotEqual,
4 => RelOp::LessEqual,
5 => RelOp::Less,
}
}
}
*/
impl<'a> From<&'a str> for RelOp {
fn from(s: &'a str) -> RelOp {
if s == ">" {
RelOp::Greater
} else if s == ">=" {
RelOp::GreaterEqual
} else if s == "!=" {
RelOp::NotEqual
} else if s == "<=" {
RelOp::LessEqual
} else if s == "<" {
RelOp::Less
} else {
RelOp::Equal
}
}
}
#[derive(Debug)]
pub struct Rel {
pub left: GenBox,
pub right: GenBox,
pub op: RelOp,
pub buf: SampleBuffer,
}
impl Generator for Rel {
fn eval<'a>(&'a mut self, params: &Parameters) -> &'a SampleBuffer {
let left_buf = self.left.eval(params);
let right_buf = self.right.eval(params);
match left_buf.rate {
Rate::Sample => {
self.buf.rate = Rate::Sample;
let bound = match right_buf.rate {
Rate::Sample => cmp::min(left_buf.len(), right_buf.len()),
Rate::Control => left_buf.len(),
};
for i in 0..bound {
let val = left_buf[i];
let thres = match right_buf.rate {
Rate::Sample => right_buf[i],
Rate::Control => right_buf.first(),
};
self.buf[i] = if match self.op {
RelOp::Greater => val > thres,
RelOp::GreaterEqual => val >= thres,
RelOp::Equal => val == thres,
RelOp::NotEqual => val != thres,
RelOp::LessEqual => val <= thres,
RelOp::Less => val < thres,
} {
1.0
} else {
0.0
};
}
},
Rate::Control => {
let val = left_buf.first();
let thres = right_buf.first();
self.buf.set(if match self.op {
RelOp::Greater => val > thres,
RelOp::GreaterEqual => val >= thres,
RelOp::Equal => val == thres,
RelOp::NotEqual => val != thres,
RelOp::LessEqual => val <= thres,
RelOp::Less => val < thres,
} {
1.0
} else {
0.0
});
},
}
&self.buf
}
fn buffer(&self) -> &SampleBuffer { &self.buf }
fn set_buffer(&mut self, buf: SampleBuffer) -> SampleBuffer {
mem::replace(&mut self.buf, buf)
}
}
pub struct RelFactory;
impl GeneratorFactory for RelFactory {
fn new(&self, params: &mut FactoryParameters) -> Result<GenBox, GenFactoryError> {
let op = match *params.get_req_param("rel", 1)? {
/* TODO
ParamValue::Integer(v) => v.into(),
ParamValue::Float(v) => (v as isize).into(),
*/
ParamValue::Integer(_) => return Err(GenFactoryError::BadType(ParamKind::Integer)),
ParamValue::Float(_) => return Err(GenFactoryError::BadType(ParamKind::Float)),
ParamValue::String(ref v) => (&*v as &str).into(),
ParamValue::Generator(_) => return Err(GenFactoryError::BadType(ParamKind::Generator)),
};
let left = params.remove_param("left", 0)?.into_gen()?;
let right = params.remove_param("right", 2)?.into_gen()?;
let buf = SampleBuffer::new(cmp::max(left.buffer().len(), right.buffer().len()));
Ok(Box::new(Rel {
left: left,
right: right,
op: op,
buf: buf,
}))
}
}
pub static Factory: RelFactory = RelFactory;
|
