[Mesa-dev] [Intel-gfx] Regression in i965 Mesa driver caused by commit c7c64d97836c71eaf2ee3fc6d384877170b8c844

[Eric Anholt]

On Tue, 22 Jun 2010 18:37:46 +0100, Simon Farnsworth <simon.farnsworth at onelan.com> wrote:
> Hello Kristian,
> 
> Your commit:
> commit c7c64d97836c71eaf2ee3fc6d384877170b8c844
> Author: Kristian Høgsberg <krh at bitplanet.net>
> Date:   Tue Jun 1 14:33:43 2010 -0400
> 
>     intel: Fallback to meta if we're asked to CopyTexImage2D from RGB to RGBA
>     
>     The pixel transfer rules state that we must set alpha to 1.0 in this case
>     which we can't easily do with the blitter.  We can do to passes: one that
>     sets the alpha to 0xff and one that copies the RGB bits or we can just
>     use the 3D engine.  Neither approach seems worth it for this case.
> 
> has broken my use of Mesa to snapshot the display using an FBO. In my code, I 
> do (where width and height are the size of the screen, snapshot_width and 
> snapshot_height are the target size of my snapshot):

This commit I think is also the one that killed openarena high-settings
performance on my 945.  (possibly other chipsets too)
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