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Fix the linear spread in Diopser

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The old one wasn't what it said on the tin. Thing is, it actually
sounded much cooler, so I may bring it back as an option.
This commit is contained in:
Robbert van der Helm 2022-03-02 16:49:16 +01:00
parent 8cc216dc02
commit 75b1b13599
1 changed files with 9 additions and 1 deletions
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10
plugins/diopser/src/lib.rs
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@ -361,6 +361,14 @@ impl Diopser {
.next_step(smoothing_interval); .next_step(smoothing_interval);
let spread_style = self.params.filter_spread_style.value(); let spread_style = self.params.filter_spread_style.value();
// Used to calculate the linear spread. This is calculated in such a way that the range
// never dips below 0.
let max_octave_spread = if spread_octaves >= 0.0 {
frequency - (frequency * 2.0f32.powf(-spread_octaves))
} else {
(frequency * 2.0f32.powf(spread_octaves)) - frequency
};
const MIN_FREQUENCY: f32 = 5.0; const MIN_FREQUENCY: f32 = 5.0;
let max_frequency = self.sample_rate / 2.05; let max_frequency = self.sample_rate / 2.05;
for filter_idx in 0..self.params.filter_stages.value as usize { for filter_idx in 0..self.params.filter_stages.value as usize {
@ -372,7 +380,7 @@ impl Diopser {
// filter // filter
let filter_frequency = match spread_style { let filter_frequency = match spread_style {
SpreadStyle::Octaves => frequency * 2.0f32.powf(spread_octaves * filter_proportion), SpreadStyle::Octaves => frequency * 2.0f32.powf(spread_octaves * filter_proportion),
SpreadStyle::Linear => frequency * 2.0f32.powf(spread_octaves) * filter_proportion, SpreadStyle::Linear => frequency + (max_octave_spread * filter_proportion),
} }
.clamp(MIN_FREQUENCY, max_frequency); .clamp(MIN_FREQUENCY, max_frequency);