Struct PresetSlot 

pub(crate) struct PresetSlot {
    pub(crate) preset: Option<MilkPreset>,
    pub(crate) evaluator: MilkEvaluator,
    pub(crate) warp_executor: WarpExecutor,
    pub(crate) state: RenderState,
    pub(crate) preset_loaded_time: f32,
    pub(crate) compiled_waves: Vec<CompiledWave>,
    pub(crate) waves_need_init: Vec<bool>,
    pub(crate) compiled_shapes: Vec<CompiledShape>,
    pub(crate) shapes_need_init: Vec<bool>,
    pub(crate) compiled_per_frame: CompiledBlock,
    pub(crate) compiled_per_frame_init: CompiledBlock,
}

Everything a single preset needs to render itself: the parsed .milk data, an evaluator context owning its variables, the per-vertex executor pre-compiled against the preset’s per_pixel_equations, the per-wave / per-shape compiled equation lists, and the render state the per-frame loop writes into.

A PresetSlot::default() carries an empty evaluator + no preset, which matches the pre-V.2 “no preset loaded” behaviour: per-frame and per-vertex evaluation are no-ops but the renderer still receives a valid (default) RenderState.

Fields

preset: Option<MilkPreset>

evaluator: MilkEvaluator

warp_executor: WarpExecutor

state: RenderState

preset_loaded_time: f32

Global state.time captured at the moment this preset was loaded — used to derive MD2’s progress ([0, 1] position within the preset’s display window). Global state.time itself carries across preset changes for continuity, so we need a separate anchor to recover per-preset elapsed time.

compiled_waves: Vec<CompiledWave>

waves_need_init: Vec<bool>

compiled_shapes: Vec<CompiledShape>

shapes_need_init: Vec<bool>

compiled_per_frame: CompiledBlock

Pre-compiled main-preset per_frame equations. Populated at load_preset so the per-frame loop in super::tick_slot_evaluator skips the regex-based reparse that the legacy MilkEvaluator::eval_per_frame path runs on every call. When the bytecode VM lowers cleanly (the common case), per_frame eval becomes a flat opcode loop too.

compiled_per_frame_init: CompiledBlock

Pre-compiled main-preset per_frame_init equations. Run once at preset load (mirroring the wave/shape init semantics) and then never again. Stored only so we can run them at the right moment without re-parsing the source.

Trait Implementations

impl Default for PresetSlot

fn default() -> Self

Returns the “default value” for a type.