Module window_layer 

Window layer — the Game Boy’s WINDOW overlay.

The Game Boy WINDOW is an overlay that can cover part of the screen. It has its own tile map and is positioned via WX (window X + 7) and WY. When enabled, it replaces the BG for all pixels at and below WY, starting from screen column (WX - 7).

Unlike BG, the window does NOT wrap — it renders from top-left of its own tile map, with no scroll offset.

Structs

WindowLayer

Window layer state.