Module context 

Execution context for Milkdrop expressions.

Structs

ColdSlab 🔒

Indexed slab for cold variables. The bytecode VM resolves cold names to slab indices at compile time and addresses them directly, skipping the HashMapContext probe + the String::from allocation that MilkContext::set would otherwise pay on every store.

HotVars 🔒

Array-backed scratch slots. The bytecode VM addresses these by index (one f64 array load per access — no enum-tag match). The parallel HotVars::slots_value array backs evalexpr’s Context::get_value(name) -> Option<&Value> contract and is kept in sync with the f64 array on every write.

MilkContext

Execution context containing all Milkdrop variables.

Constants

HOT_A

HOT_A2

HOT_ADDITIVE

HOT_ANG

HOT_B

HOT_B2

HOT_BORDER_A

HOT_BORDER_B

HOT_BORDER_G

HOT_BORDER_R

HOT_COUNT

HOT_G

HOT_G2

HOT_INSTANCE

HOT_NUM_INST

HOT_R

HOT_R2

HOT_RAD

HOT_SAMPLE

HOT_SIDES

HOT_TEX_ANG

HOT_TEX_ZOOM

HOT_THICK

HOT_VALUE1

HOT_VALUE2

HOT_X

HOT_Y

Q_CHANNEL_NAMES_32

Pre-baked "q1".."q32" strings. Hot paths that need to refer to a q-channel by name (e.g. error messages, evalexpr trait methods that only take &str) can index into this table instead of paying a format!("q{}", i) String allocation per call. Reads/writes of q-channel values themselves should go through MilkContext::q_get_idx / MilkContext::q_set_idx which skip name lookup entirely.

Functions

hot_index_of

Map a Milkdrop hot-var name → its slot index. Used by the bytecode compiler (onedrop-eval::bytecode) and by evalexpr’s Context impl below to short-circuit reads/writes of the hot vars without a HashMap probe or String allocation.

is_hot_var

Returns true iff name is a hot-path scratch variable (per-point, per-vertex, or per-shape) routed through HotVars rather than the underlying HashMapContext. The parallel-samples analyser (onedrop-engine::wave_phase::carry) uses the same set.

q_index_of

Map a qN identifier (1 ≤ N ≤ 64) to its 0-based slot index in the q-vars array. Returns None for any non-qN name or out-of-range N. Used by the bytecode VM compiler and by MilkContext’s Context impl to bypass HashMap probes for the q-channel reads/writes that dominate per_frame state passing.