DOOM Overlay Demo

Play DOOM as an overlay in pi. Demonstrates that the overlay system can handle real-time game rendering at 35 FPS.

Usage

pi --extension ./examples/extensions/doom-overlay

Then run:

/doom-overlay

The shareware WAD file (~4MB) is auto-downloaded on first run.

Controls

Action	Keys
Move	WASD or Arrow Keys
Run	Shift + WASD
Fire	F or Ctrl
Use/Open	Space
Weapons	1-7
Map	Tab
Menu	Escape
Pause/Quit	Q

How It Works

DOOM runs as WebAssembly compiled from doomgeneric. Each frame is rendered using half-block characters (▀) with 24-bit color, where the top pixel is the foreground color and the bottom pixel is the background color.

The overlay uses:

width: "90%" - 90% of terminal width
maxHeight: "80%" - Maximum 80% of terminal height
anchor: "center" - Centered in terminal

Height is calculated from width to maintain DOOM's 3.2:1 aspect ratio (accounting for half-block rendering).

Credits

id Software for the original DOOM
doomgeneric for the portable DOOM implementation
pi-doom for the original pi integration