Whether no response bytes were captured.

Cosine as a typed Q12 scalar.

Return the raw integer value for compact UI/debug display.

Snapshot the current project before a discrete mutation. Call once per user action -- paint click, place, add/delete node, etc -- so each undo step ma

Subtract another simulation tick, returning a raw elapsed-tick delta. The result wraps to match the underlying counter.

Mutable sector, creating it if needed.

Clear one pending source bit directly. Most software uses the `I_STAT` AND-acknowledge register path, but a few peripherals also expose their own ackn

Read the entire VRAM back as `Vec<u16>` (524288 entries, row-major). Blocks the calling thread on a `map_async` poll -- for tests/screenshots only, ne

MFC2 view of data register `idx`. Mirrors what the CPU sees on `mfc2 rt, $rd`.

Execute one COP2 function. `instr` is the full 32-bit instruction word so we can pull `sf`/`lm`/`mx`/`vx`/`cv`. Unrecognised commands return without u

Return the raw Q12 storage.

Drop all undo / redo entries. Used after filesystem-backed operations because snapshots only capture project metadata, not file moves that have alread

Average top height.

Snapshot of the full 128 KiB buffer for persistence.

Multiply an integer by this Q12 scalar, returning an integer.

Advance the cycle counter by `n` cycles and run any scheduled peripheral events that have come due. Called once per instruction from `Cpu::step` (char

Add a wall to an edge.

Unwrap to the underlying `u32`.

Parse a polygon vertex word: low 16 bits X, next 16 bits Y, both signed 11-bit. The drawing-offset is added here so callers get screen-space coordinat

Thin alias for the shared Q12 multiply; the editor preview uses it for camera-basis and gizmo math beyond the rotation helpers.

Mutable sector. `None` when out-of-bounds OR the cell hasn't been authored yet (use `ensure_sector` to create-on-access).

Side-effect-free byte read -- used by diagnostics (trace printer, parity oracle) that must not perturb peripheral state. Returns `None` for addresses

Default project directory (`editor/projects/default/`). Always present in the source tree; user "New Project" copies its contents into a sibling direc

Clamp authored values to runtime-safe third-person camera ranges.

VRAM X origin (0, 64, …, 960).

VRAM Y origin (0 or 256).

Expected CLUT entry count for this depth, or `None` for 15bpp.

Borrow a primitive previously written by [`push_index`](Self::push_index).

Average bottom height.

The UI scene the editor is currently authoring, resolved through the clamped active index. Replaces `active_ui_scene()` at read sites so the editor re

Draw a flat-shaded quad (two triangles sharing the v1-v2 edge).

Let the frontend surface embedded play status in the editor's existing status strip.

parent chain → fall back to the active scene's first Room. The fallback keeps paint tools enabled even when the selection sits outside the scene tree

Read a 32-bit little-endian word from a virtual address. This is the instruction-fetch path. `&mut self` because CD-ROM byte reads (composited into a

Snap a vertex height to the nearest [`HEIGHT_QUANTUM`] multiple. Round-half-away-from-zero so the snap is symmetric for negative heights -- `snap_hei

16-bit write dispatch. Returns `true` when the address fell in a recognised slot (even if the write was semantically ignored).

Depth in grid sectors.

Submit this frame's ordering table via DMA linked-list mode.

Render one frame's `cmd_log` into the persistent VRAM target. Always loads the existing texture -- never clears -- so PSX VRAM-style persistence holds

Register an event for `slot` to fire at `now + delta` bus cycles. Replaces any previous pending event for the same slot (the old deadline is discarded

Produce one stereo sample's worth of audio. Called from the bus each time `EventSlot::SpuAsync` fires. Returns the number of samples produced (current

Validate and cook one editor-authored world grid.

True when no bits are set.

Set the CD-ROM controller mode byte.

Release every button, then press exactly `button`, so the next `update` sees it as `just_pressed`. Mirrors the pad-edge idiom the gameplay-init test a

Schedule a first-response IRQ at [`Self::first_response_deadline`].

Snapshot of the currently-configured display area, for the frontend's framebuffer panel. Cheap to call each frame. The `height` is derived from the V-

Drain pending host-facing stereo samples. Frontend calls this every frame to feed its audio output. Returns `(left, right)` pairs in playback order, o

[`print`] + a trailing `\n`.

Apply one paint / erase / place action to `(sx, sz)` in `room_id`. `picked_face` is set when a face was directly ray-picked (lets us remove a specific

Advance any pending transfer / ACK timers to `now`.