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The way Unity will work on the web is the most confusing bastard stuff in the world

Unity uses Mono for It's scripting
Mono is an custom implementation of the C# spec that Microsoft partially open sourced
the part Unity uses is free due to the open source LGPL license it enjoys

Then Mobile phones happened and Apple do not allow the on the fly compilation that Mono lets you do free
This is done via a JIT VM, just in time virtual machine and is typically how C# is ran, compiled on the fly using magic

instead they have to compile beforehand ( AOT ahead of time ) which Mono wants moneys for... lots and lots of moneys
So they held Unity to ransom ( probably ) as Unity become more successful
Unity said FU... people are happy with the 5 year old version you already sold us
But people were not happy, they cried at weird memory problems and missing features that came with C# 4 and 5 that they could only dream of using, let alone the debugging issues.

And now to get out of this on going problem and finally be able to upgrade to a modern C# with better memory management they will do the following

C# is compiled to an intermediate language ( IL ) using the free part of Mono, this is normally then ran in realtime on a device via the HIT VM ( which Apple won't allow )
But instead Unity will convert this intermediate code into C++ source code, which is then compiled using Enscripten asm.js thingy made? by Firefox guys into a weird JavaScript soup that some how runs fast but looks like computer vomit

Thus taking advantage of a shit ton of work either end that is free and open source and even used and probably contributed to by their competitor Unreal Engine and Mono

They just have to take care of this middle step themselves... now do we trust them to do this part properly?

Already they are claiming "What is so exciting about IL2CPP is the big performance speedups however. We have seen 2-3x speedups on math heavy code."

Still a weird place we find ourselves that ( C# -> IL -> C++ -> JS -> Machine Code ) is a fast intelligent way of making anything.. ever..



Link: blogs.unity3d.com --- the-future-of-scripting-in-unity



Link: forum.unity3d.com --- 247039-The-collected-il2cpp-forum-topic



Link: blogs.unity3d.com --- on-the-future-of-web-publishing-in-unity




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