- From: Mike Taylor <miket@opera.com>
- Date: Mon, 10 Sep 2012 16:40:40 -0500
- To: "Dean Jackson" <dino@apple.com>
- Cc: "whatwg@lists.whatwg.org" <whatwg@lists.whatwg.org>
On Mon, 10 Sep 2012 13:14:30 -0500, Dean Jackson <dino@apple.com> wrote: > To give a real world example, the popular tool Modernizr tests for the > availability of WebGL by attempting to create a WebGL context. This can > happen > even on pages that have no intention of using WebGL - an author has just > inserted Modernizr into their page and is using it to test for another > feature. > As I said, creating a context is not a free operation. In fact, on > shipping > Safari (Mountain Lion) this causes us to switch to a more powerful GPU > on systems that have two graphics processors. > > An alternative (for the WebGL case) would be to have the author test for > the > presence of window.WebGLRenderingContext. However, this is not reliable. This is actually what Modernizr does these days [1], but older versions did in fact create the context. [1] https://github.com/Modernizr/Modernizr/blob/master/modernizr.js#L429-436 -- Mike Taylor Opera Software
Received on Monday, 10 September 2012 21:41:20 UTC