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AM only the positive ranges

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This is what the original Fake Distortion preset did.
This commit is contained in:
Robbert van der Helm 2022-03-08 23:20:30 +01:00
parent 46901bf5c9
commit 792e9469b5
1 changed files with 6 additions and 7 deletions
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13
plugins/crisp/src/lib.rs
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@ -20,12 +20,12 @@ use std::pin::Pin;
mod pcg; mod pcg;
/// Hardcoded to make SIMD-ifying this a bit easier in the future
const NUM_CHANNELS: usize = 2;
/// These seeds being fixed makes bouncing deterministic. /// These seeds being fixed makes bouncing deterministic.
const INITIAL_PRNG_SEED: Pcg32iState = Pcg32iState::new(69, 420); const INITIAL_PRNG_SEED: Pcg32iState = Pcg32iState::new(69, 420);
/// Allow 100% amount to scale the gain to a bit above 100%, to make the effect even less subtle.
const AMOUNT_GAIN_MULTIPLIER: f32 = 2.0;
/// This plugin essentially layers the sound with another copy of the signal AM'ed with white (or /// This plugin essentially layers the sound with another copy of the signal AM'ed with white (or
/// filtered) noise. That other copy of the sound may have a low pass filter applied to it since /// filtered) noise. That other copy of the sound may have a low pass filter applied to it since
/// this effect just turns into literal noise at high frequencies. /// this effect just turns into literal noise at high frequencies.
@ -101,15 +101,14 @@ impl Plugin for Crisp {
_context: &mut impl ProcessContext, _context: &mut impl ProcessContext,
) -> ProcessStatus { ) -> ProcessStatus {
for channel_samples in buffer.iter_mut() { for channel_samples in buffer.iter_mut() {
let amount = self.params.amount.smoothed.next(); let amount = self.params.amount.smoothed.next() * AMOUNT_GAIN_MULTIPLIER;
// TODO: SIMD-ize this to process both channels at once // TODO: SIMD-ize this to process both channels at once
// TODO: This does not sound quite right
for sample in channel_samples.into_iter() { for sample in channel_samples.into_iter() {
let noise = self.prng.next_f32() * 2.0 - 1.0; let noise = self.prng.next_f32() * 2.0 - 1.0;
let am = *sample * noise; let half_am = sample.max(0.0) * noise;
*sample += am * amount; *sample += half_am * amount;
} }
} }