wlgol/openspec/changes/archive/2026-11-08-arena-size/proposal.md

Proposal

Why

The current default arena is 400×400 logical pixels (50×50 cells), too small for comfortable exploration. The arena should occupy about 80% of a FullHD screen, adapting to the actual output size and scale.

What Changes

• Use wl_output mode dimensions to compute a default logical window size equal to 80% of the output, divided by the active scale.
• Keep the 8 px logical cell size; grid dimensions derive from the logical window size.
• Preserve resizable behavior and grid recalculation on resize.
• Provide a sensible fallback when output info is unavailable.

Capabilities

New Capabilities

• arena-sizing: output-aware default arena size (~80% of screen) with fallback and resize handling.

Modified Capabilities

None.

Impact

• Affected code: wlgol.c (output mode handling, default size calculation, canvas/grid resize).
• No new dependencies.