Fetch a single texel from the active texture page. Returns `None` for transparent -- PSX convention is **the resolved 16-bit colour == 0x0000**, regar

Active blend kind for the *next* primitive about to be emitted. Mono / shaded primitives always read it via this helper; textured primitives that set

Build the default bottom-anchored cube vertices for a boxed prop.

Build the camera ray in world units for the given pointer position, or `None` if the pointer's outside the viewport. Shared by `pick_3d_world` (ray vs

World-space X/Z bounds of cell `(sx, sz)` in editor convention. `z0` is the low-Z / south edge and `z1` is the high-Z / north edge.

Direction id.

Dither an 8-bit RGB triple to 15bpp using the PS1's signed additive 4×4 ordered-dither matrix (PSX-SPX '24bit-to-15bit dithering'). The algorithm per

Called by the bus for DMA channel 0 transfers -- CPU→MDEC. Each word becomes two halfwords in little-endian order.

Enable cmd_log capture WITHOUT allocating the per-pixel owner buffer. The HW (wgpu render-pipeline) renderer needs the GP0 packet stream to drive its

Ensure the world-cell `(wcx, wcz)` is addressable. Grows the grid in `+X` / `+Z` and / or shifts existing sectors (with `origin` decrementing in locks

Variant of [`fast_boot_disc`] that lets callers choose whether to enable HLE BIOS dispatch after loading the EXE. Set `enable_hle_bios` to `false` wh

Floor corner heights `[NW, NE, SE, SW]` for vertex emission.

Wall heights `[bottom-left, bottom-right, top-right, top-left]`.

Install the identity rotation matrix scaled 1.0 in 1.3.12 (i.e. every diagonal = 0x1000, off-diagonal = 0). Keeps RTPS/MVMVA fixtures readable: `MAC =

Material picker used by the sector / face inspector. `jump_to` is an out-param: clicking the `→` button writes the selected material's resource id in

Pull MAC1/2/3 into a saturated RGB and push onto the colour FIFO. `code` is taken from the current RGBC.

Read-back value -- always returns the raw register the CPU wrote, not the animated current level.

Resolve what a click at `pointer` would target, through the same path the live viewport uses.

Convert a 24-bit RGB value (as written by the CPU in GP0 packets) into the 15-bit BGR word VRAM stores. Matches Redux / PS1 hardware: the 3 high bits

Run DMA on a single channel after its CHCR was just written with the start bit set. Mirrors Redux's per-channel `dmaExec<N>` dispatch in `psxhw.cc` --

Wall record by sector-local wall index. Skip the array- decode dance the caller would otherwise do over `sector.first_wall + i`.

Currently-selected scene node. The frontend reads this so the 3D preview can highlight the selected entity.

Advance the SIO0 byte/ACK timers to the current bus cycle, forward any newly latched controller IRQ to `I_STAT`, and (re)schedule [`EventSlot::Sio`] f

Spawn `count` particles at `centre` with velocities scattered within `[-velocity_range, +velocity_range]` on each axis (Q4.4). Colour and TTL are unif

Advance one SPU sample. Ramps `current` per the configured sweep; a no-op for fixed levels (`sweep_active == false`). Direct port of PSX-SPX `VolumeEn

Advance all three timers by `cycles` system-clock ticks. Each timer converts that to its own clock source first: - Timer 0 source 1 / 3 → dot-clock (p

Toolbar group button showing the group's icon plus its current value (e.g. rotate icon + "Rotate"), so the active mode is readable without hovering.

Upload a sub-rectangle. `words.len()` must be exactly `w * h`. Out-of-bounds rects are rejected (no wrap -- the rasterizer handles wrap separately on

Return a copy using `texture_window`.

Write a save (uncompressed), overwriting any existing file of the same name. `name` is the BIOS file name (product code + label, <= 20 ASCII); `title`

Append a fresh [`OptionDef`] named `name` with a default [`OptionKind`], assign it a stable id that does not collide with any existing option, and ret

Convert binary `0..=99` to BCD for CD-ROM command parameters.

Ceiling split-triangle heights in that triangle's corner order.

Resolve the Room node that owns the current selection, if any. Order: selected face's room → climb the selected node's Walk the active scene and coll

Histogram of step-1 command bytes (`0x42`, `0x43`, `0x44`, etc.) observed since power-on / reset.

Finalise a DMA channel's transfer: clear the start bit in CHCR and notify the DMA controller so it updates DICR and returns whether this channel's IRQ

Cook every authored UI scene into one shared node pool plus a parallel scene table, and derive the default game flow. Each scene's nodes are flattene

Drop one corner -- the face becomes a visible triangle. Forces `split` to the diagonal that keeps a triangle alive (drop NE / SW → NW-SE; drop NW / SE

Fill `dst` with `s` as ASCII, space-padding (or truncating) to `dst.len()`.

Upload `asset_bytes` to VRAM if not already resident; return the slot record so the caller can build a TextureMaterial. Returns `None` if the texture

`true` if the floor split triangle is present.

True if the sector emits any geometry.

Set `room`.

True for behaviour/component nodes that are intended to be children of an [`Entity`](Self::Entity) host rather than independent placed objects.

Modulate a 15bpp BGR texel by a 24-bit RGB tint. PSX formula: `result_channel = (tint_8bit * texel_5bit * 2) / 0x100`, which makes tint value `0x80` p