[Webkit-unassigned] [Bug 44926] Multiple accelerated 2D canvases should be able to use the same GraphicsContext3D

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=44926





--- Comment #17 from James Robinson <jamesr at chromium.org>  2010-08-31 15:32:29 PST ---
Thanks for looking through this patch.  I'll do my best to address all the line-by-line comments.

The point you make about the FBO treatment is a valid one, Chris.  We'll also want to generalize this in order to support multisampling.  Here's what I propose to make this more general:

1.) No new functions on GraphicsContext3D
2.) CanvasFramebuffer adopts a more general interface to look something like:

create(SharedContext3D*, IntSize)
bind()
publishToPlatformLayer(PlatformLayer*)
publishToTexture(unsigned)

and not expose any specifics about what the FBO binds to.  Then implementations can bind a CanvasFramebuffer to either a color texture or a RenderBuffer and deal with the details of how to expose the rendering results to either a PlatformLayer (for compositing) or a texture (to draw the rendering results in another canvas).  The specifics of allocating a compositing target (texture, CALayer, etc) and doing the copy/blit/resolve will be handled by each platform.

Follow up incoming.

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