1069647 - Investigate avoiding blitFramebuffer when doing multisampling by using multisample textures

Status: RESOLVED WONTFIX

(Core :: Graphics: CanvasWebGL, defect)

Description

[Jeff Muizelaar [:jrmuizel]]

ARB_texture_multisample, OGL ES 3.1 and Direct3D recent should all let us do this and it would avoid an extra copy of the framebuffer during present and lower memory usage.

Comment 1

[Kelsey Gilbert [:jgilbert]]

Chrome has been trying to use this, and running into some serious issues. Flush()es will throw away all contents, so a lot of care needs to be exercised, and even still it probably isn't usable in all cases.

With BlitFramebuffer+InvalidateFramebuffer, we should end up on a nearly-as-fast path, and that's much safer.