[Bug 34495] Selecting objects in Blender 2.56 slow with gallium r600 driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34495

--- Comment #31 from Pierre-Eric Pelloux-Prayer <pelloux at gmail.com> 2011-07-01 10:33:20 PDT ---
(In reply to comment #29)
> More food for thought:
> 
> Using an fbo which is bigger than 1x1 is a waste of space since we only want to
> know Z values. Using a 32x32 fbo with some custom shaders we could handle 32*32
> entries and so on.
> 
> With some more shader magic maybe we could have the left half of the fbo for
> minZ values and the other half for maxZ values?
> 
> Am I dreaming or is this doable?


I tried smaller FBO (8x8 I think), but the selection in Blender worked less
reliably. But maybe that was related to wrong Z values being returned, and thus
causing problem to Blender's selection algorithm.
And, using 2 FBO might not be that expensive 1) if they are small 2) if state
changes and read back are batched
But I'm far from being an expert, so I guess we'll need to build it first to
see if how well it performs.

Thanks for the help !

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