[Mesa-dev] [PATCH] i965: setup address rounding enable bits

[Eric Anholt]

On Thu, 13 Oct 2011 11:34:34 +0800, Yuanhan Liu <yuanhan.liu at linux.intel.com> wrote:
> The patch(based on the reading of the emulator) came from while I was
> trying to fix the oglc pbo texImage.1PBODefaults fail. This case
> generates a texture with the width and height equal to window's width
> and height respectively, then try to texture it on the whole window.
> So, it's exactly one texel for one pixel.  And, the min filter and mag
> filter are GL_LINEAR. It runs with swrast OK, as expected. But it failed
> with i965 driver.
> 
> Well, you can't tell the difference from the screen, as the error is
> quite tiny. From my digging, it seems that there are some tiny error
> happened while getting tex address. This will break the one texel for
> one pixel rule in this case. Thus the linear result is taken, with tiny
> error.
> 
> This patch would fix several oglc pbo subcase fail on both ILK, SNB and
> IVB.

I would really like to see a piglit test for 1:1 linear-filtered
texturing being precise, like apparently you found in oglconform.  It's
important to compositor developers.
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