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use crate::dsp::{
DspNode, GraphFun, LedPhaseVals, NodeContext, NodeGlobalRef, NodeId, ProcBuf, SAtom,
};
use crate::nodes::{NodeAudioContext, NodeExecContext};
#[macro_export]
macro_rules! fa_amp_neg_att {
($formatter: expr, $v: expr, $denorm_v: expr) => {{
let s = match ($v.round() as usize) {
0 => "Allow",
1 => "Clip",
_ => "?",
};
write!($formatter, "{}", s)
}};
}
#[derive(Debug, Clone)]
pub struct Amp {}
impl Amp {
pub fn new(_nid: &NodeId, _node_global: &NodeGlobalRef) -> Self {
Self {}
}
pub const inp: &'static str = "Signal input";
pub const att: &'static str =
"Attenuate input. Does only attenuate the signal, not amplify it.\n\
Use this for envelope input.";
pub const gain: &'static str = "Gain input. This control can actually amplify the signal.";
pub const neg_att: &'static str =
"If this is set to 'Clip', only the **0.0**-**1.0** input range of the \
~~att~~ input port is used. Negative values are clipped to **0.0**.";
pub const sig: &'static str = "Amplified signal output";
pub const DESC: &'static str = r#"Signal Amplifier
This is a simple amplifier to amplify or attenuate a signal.
"#;
pub const HELP: &'static str = r#"Signal Amplifier
It serves the simple purpose of taking an input signal and attenuate (either
with the ~~att~~ or the ~~gain~~ parameter) or just amplifying it with
the ~~gain~~ parameter.
You can even use it as simple fixed control signal source if you leave the
~~inp~~ port unconnected and just dial in the desired output value with the
parameter.
The main idea with the ~~gain~~ and ~~att~~ parameters is, that you can set
the desired amplification with the ~~gain~~ parameter and automate it using
the ~~att~~ parameter. The ~~neg~~ setting then defines what happens with
negative inputs on the ~~att~~ port.
"#;
pub fn graph_fun() -> Option<GraphFun> {
None
}
}
impl DspNode for Amp {
fn set_sample_rate(&mut self, _srate: f32) {}
fn reset(&mut self) {}
#[inline]
fn process(
&mut self,
ctx: &mut dyn NodeAudioContext,
_ectx: &mut NodeExecContext,
_nctx: &NodeContext,
atoms: &[SAtom],
inputs: &[ProcBuf],
outputs: &mut [ProcBuf],
ctx_vals: LedPhaseVals,
) {
use crate::dsp::{at, denorm, denorm_v, inp, inp_dir, out};
let gain = inp::Amp::gain(inputs);
let att = inp::Amp::att(inputs);
let inp = inp::Amp::inp(inputs);
let out = out::Amp::sig(outputs);
let neg = at::Amp::neg_att(atoms);
let last_frame = ctx.nframes() - 1;
let last_val = if neg.i() > 0 {
for frame in 0..ctx.nframes() {
out.write(
frame,
inp.read(frame)
* denorm_v::Amp::att(inp_dir::Amp::att(att, frame).max(0.0))
* denorm::Amp::gain(gain, frame),
);
}
inp.read(last_frame)
* denorm_v::Amp::att(inp_dir::Amp::att(att, last_frame).max(0.0))
* denorm::Amp::gain(gain, last_frame)
} else {
for frame in 0..ctx.nframes() {
out.write(
frame,
inp.read(frame)
* denorm_v::Amp::att(inp_dir::Amp::att(att, frame).abs())
* denorm::Amp::gain(gain, frame),
);
}
inp.read(last_frame)
* denorm_v::Amp::att(inp_dir::Amp::att(att, last_frame).abs())
* denorm::Amp::gain(gain, last_frame)
};
ctx_vals[0].set(last_val);
}
}
