goldeneye-pc-port/docs/dev/OPTIONS-MENU-PLAN.md

In-game PC options menu — design + resume point

Status: config-system foundation landed (M-35); menu surface not built. Pattern follows docs/dev/AUDIO-PLAN.md — a plan doc that a later session executes.

Findings context: D180 (input), D181 (first route-(b) hook). Config API: configRegister{Int,UInt,Float,String} with clamps (port/include/config.h).

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1. What PD does, and why it doesn't port directly

PD's pd_port/port/src/optionsmenu.c (~2000 lines) hooks port-side handlers into PD's own decomp menu tables (menudata/menuitem arrays with MENUITEMTYPE_SLIDER etc.). It works because PD's front end is a generic data-driven list menu.

GE is different. GE's settings UI is the in-game watch (src/game/options.c): draw_watch_game_options_page / draw_watch_control_options_page + watch_screenN_navigation — hand-drawn pages with bespoke nav functions, not a table. The front-end menus (front.c, initmenus.c, mpmenu.c) are also bespoke draw/nav pairs, not a reusable list widget.

So there is no table to inject rows into. A PC options surface is either (A) a new hand-built watch page, (B) a new hand-built front-end screen, or (C) a port-layer overlay drawn outside the game's menu system.

2. Recommended approach: (C) port-layer overlay

A self-contained immediate-mode overlay in port/, toggled by a hotkey (e.g. F10), drawn as fast3d 2D quads + the game's own textRender over the top of whatever is on screen, with keyboard/mouse nav handled entirely in the port layer. Reasons:

• Zero src/ menu-code edits. No new bespoke nav function to get wrong (the watch-nav code is exactly the D118d / over-scroll family).
• Works in-level and in the front end (it's above the game).
• The values it edits are already port-owned config.c variables — the overlay is just a view over the registered option list.
• Precedent: the port already draws port-owned UI (FPS in the window title, F12 screenshot). This is the render-side equivalent.

Cost: an immediate-mode widget layer (label, slider, toggle, dropdown) in fast3d 2D. ~300–500 lines. The config.c registry already gives us key/min/max/value + a type tag (after M-35) — enough to auto-generate rows.

Sketch

port/src/optionsoverlay.c
  optionsOverlayToggle()        // F10 in video.c event pump
  optionsOverlayHandleInput()   // called from inputComputePad idx 0 when open:
                                //   swallow kbd/mouse from the game, drive the cursor
  optionsOverlayRender(Gfx**)   // called from a fast3d 2D hook after the game DL

Registry additions needed in config.c:

• configForEachOption(cb) — iterate {key, type, ptr, min, max}.
• optional per-option metadata: display label, step, enum-value names, "apply live" vs "needs restart". Add a configRegisterIntEx(...) variant or a side table keyed by dotted key.

Live-apply: most keys already re-read their variable every frame (mouseAimSpeed, portScreenShakeScale, cfgVSync via videoSetVSync). Ones that need a hook (MSAA, fullscreen) get an configOnChange callback or are flagged "restart".

3. Minimum option set for v1

Row	Key	Type	Notes
VSync	Video.VSync	toggle	live (SDL_GL_SetSwapInterval)
Frame cap	Video.FpsCap	int slider 0–360	live
MSAA	Video.MSAA	dropdown 1/2/4/8	needs FBO rebuild — flag "restart" for v1
Texture filter	Video.TextureFilter	dropdown nearest/bilinear/3-point	live-ish
Mouse aim speed	Input.MouseAimSpeed	slider 1–100	live
Mouse turn speed	Input.MouseTurnSpeed	slider 1–100	live
Mouse invert Y	Input.MouseInvertY	toggle	live
Capture mode	Input.MouseCaptureMode	toggle	live
Screen shake	Game.ScreenShakeIntensity	slider 0–3 (×)	live (D181)
Screenshot key	—	(F12, documented; rebind = later)	—

configSave() on overlay close.

4. Alternative if an in-fiction surface is required later

2026-09-27: route B chosen (v0.4.0 intake). The entry point is on the file select screen, not a main options menu (GE's front end has none). M1 landed as D343: an "Options" label that opens the F10 overlay, via one Rule-2 #ifdef PORT draw hook. M2 (a GE-styled screen that reuses the overlay's rows) follows.

Route (B): a new front-end screen constructor_menuXX_pcoptions + menuXX_pcoptions_navigation in front.c under #ifdef PORT, reached from a new "PC OPTIONS" row on the main options menu. Each row calls a configGet/Set shim. This is a genuine route-(b) src/ edit (menu content change) → its own Dxx, N64 verbatim under #else, opt-in. More faithful, more surface area, more nav bugs. Defer unless the owner wants it in-fiction.

5. Resume checklist

1. Add configForEachOption + a label/step/enum side-table to config.c.
2. Build the fast3d 2D immediate-mode widget helpers (reuse gDPFillRectangle
   • textRender; see how options.c draw_watch_game_options_page emits text for the font/Gfx** conventions).
3. port/src/optionsoverlay.c state machine + F10 toggle in video.c.
4. Route input: when open, inputComputePad idx 0 returns a neutral pad and forwards nav to the overlay (same "swallow" pattern WI-1 uses for the free-cursor click).
5. configOnChange hooks for MSAA/fullscreen; everything else is live.
6. Verify: overlay open/close in-level and in the front end; golden dumps unaffected with the overlay closed (it draws nothing).