The goal is to make a game canvas high res / retina.
I'm working with a software called Gamemaker and I want to make this canvas high res / retina. Though I have no real idea how to implant this.
Here are two links who explain the problem very clearly http://www.smashingmagazine.com/2012/08/20/towards-retina-web/ and http://www.html5rocks.com/en/tutorials/canvas/hidpi/
This is the code the html5 page uses to launch the game:
<canvas id="canvas" width="640" height="480">
<script type="text/javascript" src="html5game/GameMaker_HTML.js?AHMYB=1445354237"></script>
The game's javascript file is unreadable.
How do I achieve making the whole javascript canvas high res / retina?