truce 0.48.7

#![forbid(unsafe_code)]

pub use truce_core as core;
pub use truce_derive::{ParamEnum, Params, State};
pub use truce_gui as gui;
pub use truce_params as params;

#[cfg(feature = "clap")]
pub use truce_clap as clap_wrapper;

#[cfg(feature = "vst3")]
pub use truce_vst3 as vst3_wrapper;

mod plugin_macro;

/// Re-exports used by the plugin! macro internals.
#[doc(hidden)]
pub mod __reexport {
    pub use truce_derive::__truce_lv2_emit_root;
    pub use truce_loader::{export_plugin, export_static};

    #[cfg(feature = "shell")]
    pub use truce_loader::shell::HotShell;

    /// Hot-reload sidecar path resolver. Routed through
    /// `truce_core::shell_sidecar` so plugin crates that expand
    /// `truce::plugin!` only need `truce` in their dependency set;
    /// the `#[cfg(feature = "shell")]` arm calls this at runtime.
    #[cfg(feature = "shell")]
    #[must_use]
    pub fn shell_sidecar_path(crate_name: &str) -> Option<std::path::PathBuf> {
        truce_core::shell_sidecar::sidecar_path(crate_name)
    }
}

// Single implementation module; the four preludes are wafer-thin
// alias wrappers that swap the `FloatParamRead*` trait + `Sample`
// type alias.
mod prelude_impl {
    pub use std::f64::consts::TAU;
    pub use std::sync::Arc;
    pub use truce_core::custom_state::{State as StateTrait, StateBinding, StateField};
    pub use truce_core::sample::{Float, Sample as SampleTrait};
    pub use truce_core::state::StateLoadError;
    pub use truce_core::util::{db_to_linear, linear_to_db, meter_display, midi_note_to_freq};
    // `AudioBuffer` is *not* re-exported from `truce_core` here -
    // each prelude module declares its own per-precision
    // `pub type AudioBuffer<'a> = truce_core::buffer::AudioBuffer<'a, $sample>;`
    // so the `#[plugin_logic]`-rewritten user impl sees the right
    // buffer precision through scope resolution.
    pub use truce_core::{
        BusConfig, BusKind, BusLayout, ChannelConfig, Editor, Event, EventBody, EventList, Plugin,
        PluginCategory, PluginContext, PluginExport, PluginInfo, ProcessContext, ProcessStatus,
        TransportInfo,
    };
    pub use truce_derive::{ParamEnum, Params, State, plugin_info};
    // `PluginLogic` itself is *not* re-exported here - each prelude
    // chooses its own leaf trait (`PluginLogic` for f32, aliased
    // `PluginLogic64 as PluginLogic` for f64) so plugin authors write
    // `impl PluginLogic for X { ... }` without naming a precision.
    pub use truce_gui::interaction::WidgetRegion;
    pub use truce_gui::render::RenderBackend;
    pub use truce_gui::theme::{Color, Theme};
    pub use truce_params::{
        BoolParam, EnumParam, FloatParam, IntParam, MeterSlot, ParamEnum, ParamFlags, ParamInfo,
        ParamRange, ParamUnit, Params, Smoother, SmoothingStyle,
    };
}

// Stamps a prelude module from one template - all four preludes
// (default / 32 / 64 / 64m) only differ in:
//   - `$sample` - the buffer type (`f32` / `f64`)
//   - `$leaf`   - which `PluginLogic` leaf trait to alias as
//                  `PluginLogic` in the user's scope
//   - `$float_read` / `$ctx_read` - which precision-routed read
//                  traits to bring in via `as _`
//
// Keeping the bodies in one place means a future addition (new
// extension trait, additional re-export) lands once instead of
// four times.
macro_rules! define_prelude {
    (
        $(#[$attr:meta])*
        $name:ident, sample = $sample:ty, leaf = $leaf:ident,
        float_read = $float_read:ident, ctx_read = $ctx_read:ident
    ) => {
        $(#[$attr])*
        pub mod $name {
            pub use super::prelude_impl::*;
            pub use truce_core::editor::$ctx_read as _;
            /// User-facing leaf trait. The prelude renames the
            /// precision-pinned leaf to `PluginLogic` so plugin
            /// authors write the same `impl PluginLogic for X { ... }`
            /// header regardless of which prelude they imported.
            pub use truce_gui::$leaf as PluginLogic;
            pub use truce_params::$float_read as _;
            /// Audio sample type for this prelude.
            pub type Sample = $sample;
            /// `AudioBuffer` with `S` defaulted to this prelude's
            /// `Sample`. The defaulted type parameter (stable since
            /// Rust 1.27) lets plugin code use the precision-pinned
            /// shorthand `&mut AudioBuffer` *and* still override it
            /// explicitly when some piece of code needs a different
            /// precision in the same file (e.g., a helper that
            /// processes both `AudioBuffer<f32>` and
            /// `AudioBuffer<f64>`). `S` only defaults when the
            /// type-arg list is empty.
            pub type AudioBuffer<'a, S = Sample> = truce_core::buffer::AudioBuffer<'a, S>;
        }
    };
}

define_prelude! {
    /// Default prelude. Same shape as [`prelude32`] - `f32` audio
    /// path. Use whichever name reads better at the import site.
    prelude, sample = f32, leaf = PluginLogic,
    float_read = FloatParamReadF32, ctx_read = PluginContextReadF32
}

define_prelude! {
    /// `f32`-flavoured prelude. `param.read()` resolves to `f32`
    /// via [`FloatParamReadF32`](truce_params::FloatParamReadF32);
    /// the audio buffer is `f32` (the host wire format for nearly
    /// every plugin format).
    prelude32, sample = f32, leaf = PluginLogic,
    float_read = FloatParamReadF32, ctx_read = PluginContextReadF32
}

define_prelude! {
    /// `f64`-flavoured prelude. The audio buffer is `f64` end-to-end
    /// (high-order biquads, oscillator phase accumulators,
    /// long-running cumulative state where 24-bit f32 precision
    /// shows up audibly). The format wrapper widens the host's
    /// audio buffer to `f64` at the block boundary and narrows on
    /// the way out.
    ///
    /// **Don't import both `prelude` and `prelude64` in the same
    /// file** - the two `read` / `value` / `current` traits will
    /// collide on method dispatch. That collision is the right
    /// error if the file hasn't committed to a precision.
    prelude64, sample = f64, leaf = PluginLogic64,
    float_read = FloatParamReadF64, ctx_read = PluginContextReadF64
}

define_prelude! {
    /// Mixed-precision prelude (`m` for "mixed"). The audio buffer
    /// stays at host wire precision (`f32` - no wrapper-boundary
    /// widening cost) but `param.read()` returns `f64` so
    /// intermediary math (filter coefficients, phase accumulators,
    /// long-tail feedback) runs at `f64` precision.
    ///
    /// Plugin DSP under this prelude writes the narrowing cast at
    /// the buffer-write site:
    ///
    /// ```ignore
    /// use truce::prelude64m::*;
    /// use truce_core::Float; // brings `.to_f32()` into scope
    ///
    /// let cutoff = self.params.cutoff.read(); // f64
    /// let gain   = self.params.gain.read();   // f64
    /// // ... f64 math ...
    /// out[i] = (sample * gain).to_f32();      // narrow once at the edge
    /// ```
    ///
    /// Trade vs [`prelude64`]: you skip the wrapper's per-block
    /// widen + narrow memcpy at the cost of writing `.to_f32()` on
    /// the way out. Pick this when the wrapper boundary cost
    /// actually shows up in the profiler (very high channel counts,
    /// very small blocks); otherwise [`prelude64`] is the cleaner
    /// choice.
    prelude64m, sample = f32, leaf = PluginLogic,
    float_read = FloatParamReadF64, ctx_read = PluginContextReadF64
}