Multiple Windows

[Gregg Tavares]

I spent last night throwing together a multiple windows WebGL demo

http://greggman.com/downloads/examples/three.js/examples/webgl_multiple_windows.html

Click on "Click for New Window" to make new windows with views of the same scene. Drag the controls to see the scene get updated in all windows.

it's not meant to be a usable library, mostly just a sample.

It works by making an offscreen WebGL canvas and one 2d canvas per window (including the main window). To render a particular window it sets the viewport to match the window's size, renders the scene to the offscreen canvas, then calls ctx.drawImage to 'blit' the scene into the specific window.

I suspect it runs too slow on Windows, something the browser implementors might want to look into.

On the other hand I was hoping to show that if you want to create a 3d modeler with multiple windows there are ways to do it.

[Kenneth Russell]

Cool. Nice example.

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[Michel Braz de Morais]

Nice example but very very slow.
My Pc Firefox windows.

att,

Michel Braz de Morais

Analista / Desenvolvedor de sistemas

2013/4/25 Kenneth Russell <k...@chromium.org>

[Gregg Tavares]

Yes, Like I mentioned it runs reasonably fast on OSX and Linux. We'll need to figure out why it's slow on windows.

[Mark Callow]

On 13/04/26 8:51, Gregg Tavares wrote:

Yes, Like I mentioned it runs reasonably fast on OSX and Linux. We'll need to figure out why it's slow on windows.

I think we have noted before that glReadPixels in ANGLE on D3D is slow. Presumably there is a glReadPixels happening during the ctx.drawImage call.

Regards

    -Mark

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[Gregg Tavares]

On Tue, Apr 30, 2013 at 8:30 PM, Mark Callow <callo...@artspark.co.jp> wrote:

On 13/04/26 8:51, Gregg Tavares wrote:

Yes, Like I mentioned it runs reasonably fast on OSX and Linux. We'll need to figure out why it's slow on windows.

I think we have noted before that glReadPixels in ANGLE on D3D is slow. Presumably there is a glReadPixels happening during the ctx.drawImage call.

It's possible but ideally there should be no need to call glReadPixels so there's room for optimization