Super simple real-time multi-user paint app:

• Client: Odin + raylib (1920x1080 black canvas)
• Server: Elixir mix app on OTP TCP/ETS primitives
• Draw with left click (white), erase with right click (black)
• Network sends only changed pixels in batches

See PROTOCOL.md for message format.

• client/main.odin - raylib painter + TCP client
• server/mix.exs - Elixir server project
• server/lib/paint_together/server.ex - listener, accept loop, snapshot + broadcast flow
• server/lib/paint_together/client.ex - per-client TCP process and frame parsing
• server/lib/paint_together/canvas.ex - ETS-backed authoritative canvas state

Start server:

cd server
mix run --no-halt

Start client (default server 127.0.0.1:4000):

cd client
odin run .

Or specify host:port:

cd client
odin run . -- 192.168.1.50:4000

Open multiple clients and draw to verify real-time sync.

• Single shared room
• Server stores authoritative canvas in memory
• New clients receive snapshot chunks with only non-black pixels
• Deltas are broadcast to every client except the sender