Open Bug 1136734 Opened 8 years ago Updated 5 years ago

Bypass compositor for WebGL canvas elements in fullscreen mode.


(Core :: Graphics: CanvasWebGL, defect, P3)





(Reporter: mikedeboer, Unassigned)




(Whiteboard: [gfx-noted][games:p3][platform-rel-Games])

See URL for the relevant thread on the WebGL mailing list.

Quote from the first message in that tread:
"One of the issues with WebGL in particular on mobile is because WebGL has to be composited it loses a lot of performance. What I mean is WebGL renders to a texture. That texture is then drawn into the backbuffer in the correct order with other HTML elements. This effectively means a fullscreen WebGL app is drawing an entire extra screen worth of pixels vs a native app."

So once a canvas element goes fullscreen, it is expected that we can get quite the performance boost and framerate improvement if we can bypass the Gecko layout pipeline - the compositor - and write to the (GL) backbuffer directly.

This was also discussed on the dev-platform mailing list, starting here:
Thank you for bringing this discussion here too, we'll be following this one closely as well!
Again, if you ever need a real-life example of such usage or potentially a testbed game, feel free to send me a mail and we'll give you access to Project Atlas' closed alpha.
Yep, this is the plan. It'll take a little work, but it'd be really nice for a number of reasons. Hopefully something for Q2.
Whiteboard: gfx-noted
I can also provide large numbers of WebVR test cases.
Whiteboard: gfx-noted → [gfx-noted][webvr]
Whiteboard: [gfx-noted][webvr] → [gfx-noted][webvr][games:p3]
Whiteboard: [gfx-noted][webvr][games:p3] → [gfx-noted][webvr][games:p3][platform-rel-Games]
platform-rel: --- → ?
I am removing the [webvr] tag as a VR specific rendering path that bypasses the compositor has been implemented as part of the WebVR 1.0 support in Bug 1250244.

Perhaps the VR specific implementation may be a good reference for someone implementing the general purpose WebGL case.
See Also: → 1250244
Whiteboard: [gfx-noted][webvr][games:p3][platform-rel-Games] → [gfx-noted][games:p3][platform-rel-Games]
See Also: → 1297597
platform-rel: ? → ---
Assignee: nobody → rbarker
Assignee: rbarker → nobody
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