Playing in the browser

The player runs opencmr2.wasm in your browser with gasm's web runtime, in a Web Worker. You need:

• your Colin McRae Rally 2.0 CD as an .iso image, the CD's files in a folder, or an installed copy of the game (see Game data);
• a recent Chrome, Edge or Firefox, or Safari 17 and later: WebAssembly, Web Workers, WebGL 2 and OffscreenCanvas (the game draws with WebGL 2 inside the worker);
• about 610 MB of browser storage to import the data once, or none to play without importing.

The game is a work in progress: the menus and a single stage run, much is still missing (Status).

Choosing the game

Choose a disc image and pick an .iso (or raw .bin) of the CD (how to make one), or Choose the CD's folder and pick a folder with the CD's files (or an installed game, or the folder above either). The page checks a folder for FrontEnd, Game and the program: the installer cabinet (data1.hdr, data1.cab, data2.cab, which hold CMR2.exe) or an installed CMR2.exe of version 1.11. It keeps only the folders the game reads (not the installer, the manual, Acrobat Reader or DirectX). An image is checked for an ISO 9660 volume; the game itself checks what is inside. Then:

• Import and play copies the files the game reads into the site's private browser storage (OPFS). Later visits start at once with Play. Remove imported data deletes the copy.
• Play without importing reads the files from the folder or image you picked. You pick it again next time.

Nothing is uploaded: the files are read in your browser. Options and saves are kept in the browser's storage for this site (IndexedDB).

While playing

The game reads the keyboard with the original's default keys: the cursor keys and Enter in the menus, Esc to go back, and to pause on a stage. The game draws at the size it is shown: use Fullscreen (or double-click) for the full resolution. Holding Esc for a second stops the game; in fullscreen the browser takes Esc to leave fullscreen first. The line under the game shows the frames per second.

For developers

?hashframes=N runs N frames on virtual time and prints the same hash line as gasm-run --headless N (with input= for scripted input, gasm-run's --input syntax, and size=WxH for the drawing size; 1280x720 by default, the size gasm-run --headless draws at, so the hashes match). Other query parameters are passed to the game (car=, stage=). tools/web-play-test.mjs drives this page in headless Chrome.

The page needs opencmr2.wasm and gasm's web runtime next to it, both git-ignored:

docs/scripts/copy-wasm.sh                          # build-gasm/opencmr2.wasm -> docs/public/play/
cd docs && pnpm install && scripts/vendor-web.sh   # @emdzej/gasm-host and csfs -> docs/public/play/vendor/
pnpm build && pnpm preview