thibaultimbert / intel8080 Goto Github PK

A while ago you tweeted that IE11 perf was lacking.
After some investigation it looks like the issue is on line 44 of screen.js.

If you change

var i = (y * imagedata.width + x) * 4;

to this

var i = (y * (imagedata.width | 0) + x) * 4;

you'll get better performance.

The issue comes down to Chakra incorrectly type specializing i as a float, partly because it lacks information about the DOM property imagedata.width. Explicitly coercing imagedata.width to an integer gives Chakra the info it needs to avoid the mix-up. I've filed a bug with Chakra to address this issue.

/@dstorey

Great work!! I could not find any mention of LICENSE. Which do you intend to apply? I thought this would make a great addition to my little project gamer.

Thanks again for the project and the detailed explanation.