87 lines
3.5 KiB
Rust
87 lines
3.5 KiB
Rust
//! TODO: Document how to use the [Param] trait. Also mention both interfaces: direct initialization
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//! + `..Default::default()`, and the builder interface. For the moment, just look at the gain
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//! example.
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use std::fmt::Display;
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// Parameter types
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mod boolean;
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pub mod enums;
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mod plain;
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pub mod internals;
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pub mod range;
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pub mod smoothing;
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pub use boolean::BoolParam;
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pub use enums::EnumParam;
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pub use plain::{FloatParam, IntParam};
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/// Describes a single parameter of any type.
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pub trait Param: Display {
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/// The plain parameter type.
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type Plain;
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/// Get the human readable name for this parameter.
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fn name(&self) -> &'static str;
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/// Get the unit label for this parameter, if any.
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fn unit(&self) -> &'static str;
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/// Get the number of steps for this paramter, if it is stepped. Used for the host's generic UI.
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fn step_count(&self) -> Option<usize>;
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/// Get the unnormalized value for this parameter.
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fn plain_value(&self) -> Self::Plain;
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/// Set this parameter based on a plain, unnormalized value. This does **not** snap to step
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/// sizes for continuous parameters (i.e. [FloatParam]).
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///
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/// This does **not** update the smoother.
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fn set_plain_value(&mut self, plain: Self::Plain);
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/// Get the normalized `[0, 1]` value for this parameter.
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fn normalized_value(&self) -> f32;
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/// Set this parameter based on a normalized value. This **does** snap to step sizes for
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/// continuous parameters (i.e. [FloatParam]).
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///
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/// This does **not** update the smoother.
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fn set_normalized_value(&mut self, normalized: f32);
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/// Get the string representation for a normalized value. Used as part of the wrappers. Most
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/// plugin formats already have support for units, in which case it shouldn't be part of this
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/// string or some DAWs may show duplicate units.
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fn normalized_value_to_string(&self, normalized: f32, include_unit: bool) -> String;
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/// Get the string representation for a normalized value. Used as part of the wrappers.
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fn string_to_normalized_value(&self, string: &str) -> Option<f32>;
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/// Get the normalized value for a plain, unnormalized value, as a float. Used as part of the
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/// wrappers.
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fn preview_normalized(&self, plain: Self::Plain) -> f32;
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/// Get the plain, unnormalized value for a normalized value, as a float. Used as part of the
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/// wrappers. This **does** snap to step sizes for continuous parameters (i.e. [FloatParam]).
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fn preview_plain(&self, normalized: f32) -> Self::Plain;
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/// Set this parameter based on a string. Returns whether the updating succeeded. That can fail
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/// if the string cannot be parsed.
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///
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/// TODO: After implementing VST3, check if we handle parsing failures correctly
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fn set_from_string(&mut self, string: &str) -> bool;
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/// Update the smoother state to point to the current value. Also used when initializing and
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/// restoring a plugin so everything is in sync. In that case the smoother should completely
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/// reset to the current value.
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fn update_smoother(&mut self, sample_rate: f32, reset: bool);
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/// Allocate memory for block-based smoothing. The [crate::Plugin::initialize_block_smoothers()]
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/// method will do this for every smoother.
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fn initialize_block_smoother(&mut self, max_block_size: usize);
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/// Internal implementation detail for implementing [internals::Params]. This should not be used
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/// directly.
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fn as_ptr(&self) -> internals::ParamPtr;
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}
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