[Rugaliz]

Summary

Singleplayer (JA and JO) is hard to use on modern displays: it starts in a 4:3 window, the video menu only offers fixed 4:3 modes (640x480 to 2048x1536), all 2D (menus, HUD, console) is stretched across ultrawide screens, and the field of view is squeezed vertically. This PR makes it work out of the box.

Changes

• Defaults (SP engine only, _JK2EXE): r_mode -2 and r_fullscreen 1, i.e. fullscreen at the desktop resolution. When the requested size equals the desktop size, a borderless fullscreen window (SDL_WINDOW_FULLSCREEN_DESKTOP) is used instead of switching display mode. Other sizes still use a real mode switch. MP defaults are unchanged.
• Renderer (rd-vanilla): new r_wideUI cvar (default 1, latched). On displays wider than 4:3 the 2D virtual screen stays 480 units high and becomes proportionally wider, and the 640x480 area keeps its proper proportions, centred. Quads spanning the full 640 width (backgrounds, fades, screen flashes, bars) still cover the whole screen, fullscreen cinematics are pillarboxed, and the level-change dissolve uses the wide area. Displays at 4:3 or narrower behave exactly as before; r_wideUI 0 restores the old stretched behaviour.
• UI: the video mode field is rebuilt from the modes SDL reports (r_availableModes) plus a "Desktop resolution" entry. The selection goes through ui_r_resolution (desktop or WxH) and is translated to r_mode -2 or r_mode -1 + r_customwidth/height when applied. The quality presets no longer reset the resolution. 3D models in menus use the same uniform scale and offset (uiDC.bias, which was computed but never used in SP).
• FOV: cg_fovAspectAdjust now defaults to 1 so the horizontal FOV grows with the aspect ratio. Existing configs keep their saved value.

Testing

• JO SP on Linux at 3440x1440, 1920x1080, 1024x768 and 1280x1024: main menu, HUD, in-game menu, console, intro/in-game cinematics, applying a resolution change through the same code the menu uses, first run with no config goes fullscreen at desktop resolution.
• JA SP, the MP engine (shares sdl_window.cpp) and JO SP build cleanly. JA SP and MP were not run, and Windows/macOS were not tested.

Known limitations

• The HUD is a centred 4:3 block (anchoring to the screen edges would leave a gap in the weapon bar).
• Textured full-screen overlays (zoom masks, loading images) are still stretched.
• The "Desktop resolution" label is English only.

Notes

Original code, contributed under the project's GPLv2 license. Written with AI assistance (Claude Code) and reviewed/tested by the submitter.

🤖 Generated with Claude Code