Just in case anyone is still reading this--I failed to point this out better (or rather, GitHub fails to make it clear that you can even provide them), but there's a prebuilt binary here: https://github.com/drvink/electroportis/releases
I saw ia32rtools when it was released (and was impressed, since x86 is so much more difficult than MIPS), but I haven't had a good chance to really look over how it works. But I think his approach is roughly the same in spirit--the translation from disassembly to C is pretty direct. His tool has to track the stack, set flags for instructions that change them, and other things like that; my decompiler doesn't bother with the stack at all (the ElectroPaint binary has no functions that spill arguments to stack and never adjusts the stack pointer within a function), and MIPS doesn't have "flags" (ALU comparison results are just stored in a GPR, though floating point comparisons do have a flag--I think later MIPS versions have multiple condition FPU registers though). Both tools handle variable argument functions, and of course in order to do so you have to have special handling of each function--that's why my decompiler has an entire parser just for printf and scanf...fortunately the only variable argument functions used by ep. :)
I don't know if or when I'll have time for a Linux version, but I would love to see it made available for all OSes. I just know I can't personally commit to properly maintaining it for more than one platform for the time being, mostly because of the 64-bit issue more than anything...
I'm reasonably certain that the drawing routines are the same, apart from the translation to OpenGL. The author of the OpenGL translation showed up in this thread, actually: https://news.ycombinator.com/item?id=7700340
I'm glad you like it! I'm sorry that it's Windows-only; I would like to make it available for more OSes, but the pointer size issue is a real impediment, and Windows is least likely to be throwing away 32-bit support any time soon, so...
A WebGL or GLES version would be great, but I actually don't know much at all about graphics!
By the way, as far as I can tell, I don't think you broke anything in your port. The disassembly of the OpenGL version's drawing routines looks like a pretty direct translation of the routines from the ep source that comes with IGL. The random seed initialization is the same in both, too:
That source is very old and lacks the animation scripts that have made ep famous, as I described in the README. (In fact, there have been a number of different animation scripts over the years; I've been in contact with the author of the software you linked, and he was nice enough to provide some, though I haven't yet tried them in the version I decompiled.)
Hi, I'm the guy that wrote the decompiled version. I forgot to ask David Tristram whether he wanted a specific license applied to the ep part of what I released beyond the text for which he asked. The version of ep in the IGL distribution is under the GPL, but I've sent an email to him for clarification. I'll update the license file once I get a reply.
Enjoy!