Bug 91786

ps: I'm not sure what driver to select with intel hd 5500, please change it to the appropriate and remove this message if it's wrong.

(In reply to CapsAdmin from comment #1)
> ps: I'm not sure what driver to select with intel hd 5500, please change it
> to the appropriate and remove this message if it's wrong.

You got it right (Drivers/DRI/i965) :)

This is still present in 11.1.2, in i965-va-driver.  Some example screenshots and code below:

Nearest neighbour, no anisotropy settings specified: https://i.imgur.com/LadPw7T.png - note the clearly defined windows in the foreground, but the banding in the building on the right.

As above but with anisotropy set to 16.0: https://i.imgur.com/9YiQi2S.png - note that the banding on the right is gone, but the nearest neighbour effect on the nearby windows now looks like linear filtering.

Finally, with anisotropy explicitly set to 1.0: https://i.imgur.com/7ZckqqN.png - this is indistinguishable from the screenshot with no anisotropy set at all.

Other drivers (on Windows, OS X etc) render this scene correctly with anisotropic filtering removing the banding while still showing nearest neighbour filtering in the foreground, I can provide comparable screenshots if that would be useful.

Relevant parameters to reproduce: 
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  // anything other than 1.0f below disables the nearest neighbour filtering
  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 16.0f);

Created attachment 123400 [details] [review]
Patch to only apply anisotropic mode if filter is set to linear

Does the attached patch make it match your expectations?

My patch landed a while back, and that fixed a bunch of anisotropic issues in various games.  I never heard back from you, so I'm hoping it fixed it for you.  If not, feel free to reopen.