Hi! It’s been a while! I haven’t posted in a while, I might try to write a proper full blog post at some point. But for now, I thought I’d do a little “Happy Holidays” post and share something neat I’ve been working on:
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These are screenshots from an in-the-browser version of Verge 3, running a few games I’ve tested/gotten working with it. It’s built on top Emscripten, and targets a WASM binary. Only tested in Chrome, but should probably work in Firefox too – needs a fairly modern browser to support the features it needs to run, like audio worklets. Some of these aren’t even compatible under the newest Verge, so this was simultaneously a project to port to the web, and to add compatibility configs to Verge so that it could open older versions.
Try it out: https://make.vg/v3wasm/wip-2022-12-22/ (fingers crossed the bandwidth for this isn’t going to be too heavy and melt down my poor server, these are pretty big downloads, but we’ll try it for now!)
The source branch is here: https://github.com/verge-rpg/verge3/tree/ovk-wip-3.2-wasm-2022
Thanks to the work already done by Andy Friesen on v1wasm + v2wasm (Verge Archive: https://andyfriesen.com/verge-archive/) a lot of stuff was already figured out. This builds off that, makes some improvements, and also solves more problems unique to V3. I’d eventually like to merge it in with the rest of the Verge Archive page.
It would potentially be neat to cut a new desktop build when this is done, too.
Basically, I undo the trunk changes after Verge 3.2 that removed VC in favor of only Lua + some other sweeping ‘kill legacy code’ changes that didn’t pan out. In hindsight, it was probably overambitious, and also didn’t anticipate that running old versions of Verge would become increasingly harder in newer OSes.
I added a bunch of compatibility stuff to deal with incompatible versions of system.xvc – the sad part is, Verge 3 had a version in its system.xvc, but not once did we bump it as we changed the format. I guess the assumption there was we’d never want to run an xvc from an older version with a new one, you should always redistribute it with the verge.exe it was meant to be played with, and we’d always have source access to generate the xvc. But that doesn’t really work as great if you want to play those old versions years later, after the source was lost, and the version of executable they came with is maybe not working that well in newer Windows.
There’s also some compatibility for compiling VC code, re-adding some language features that were previously removed, allowing a way to override the built-in library functions in user code (min, max, abs redefinition problems come up a lot), and ignoring duplicate definitions for some stuff (some games redefine things more than once, and it used to compile because it would ignore the second definition).
Another thing is this uses SDL 2 instead of 1.3 like it used to for its SDL backends. This means it builds against something that actually has long-term support and unlike 1.3, SDL2 has a native wasm build provided with Emscripten.
The Linux and Mac ports could benefit from the SDL 2 migration, if they were dusted off. The Linux build will no longer need X11 to do MessageBox since SDL provides its own implementation now, joysticks support hot-plugging in the SDL build. I implemented some window scaling stuff for the SDL version that previously was only done for the GDI windows version. Additionally, the WASM build of the game has an interesting thing where it will auto-escape slashes + lowercase all the paths you pass it as part of opening a file – it would be cool if we had a mode to let desktop builds also do this, so Windows-only games can be portable without changing the original game.
One thing I’d really like to see is a way to run games from .zip. Then it wouldn’t need to prepare a manifest.txt (a file listing used by the web version can preload the files), since the listing could be taken directly from the zip directory structure, and the browser could fetch less things + have slightly more compression. (maybe not a big deal in light of GZIP’d http responses, but still, could be worth looking into). The other advantage, is the paths don’t need to be lower-cased. And overall, more games could be run as-is directly out of their archive, aside from potentially needing verge.cfg edits.
Anyway, posting it in case so other people can check out / potentially help continue the effort! I’m going to be busy with holidays, and may need a break from this project. Still, I’m impressed what was possible in such a short time. I started this a couple weeks ago + plugged away at it on nights/weekends and a little bit on my break.
Seeing this engine suddenly run these old games in the browser is kinda magic, I hope it can keep being improved!
