On Sat, Oct 15, 2011 at 2:11 AM, Eric Anholt <e...@anholt.net> wrote: > On Thu, 13 Oct 2011 11:34:34 +0800, Yuanhan Liu <yuanhan....@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.
Will try to write one next week. Thanks, Yuanhan Liu _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
