Core i7 3770 (Ivy Bridge) + Linux + Firefox MCAA fails

[doppioandante]

On the text demo, zooming too much causes the text to appear like this:

Changing options doesn't make much of a difference (sometimes the artifacts change), but using a different antialiasing solves this.

If I activate subpixel-AA the rendering time jumps to 90-120ms, but only after the same level of zoom where the bad rendering shows up.
I'm using linux with the integrated GPU of the Core i7 3770 (Ivy Bridge).
The browser is Firefox 58.0b6

relevant glxinfo:

client glx vendor string: Mesa Project and SGI
    Device: Mesa DRI Intel(R) Ivybridge Desktop  (0x162)
OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Desktop 
OpenGL core profile version string: 4.2 (Core Profile) Mesa 17.2.2 - padoka PPA
OpenGL version string: 3.0 Mesa 17.2.2 - padoka PPA
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 17.2.2 - padoka PPA

[pcwalton]

Suspect driver bug.

[doppioandante]

I should try this on Windows, unfortunately I have no rust dev env there.

[doppioandante]

Good news, it works now. Commit 7e0d003 fixed it, so I think that the driver bug is not triggered anymore after that refactoring.

[pcwalton]

Great, thanks for testing!