[Crrcsim-devel] anti aliased graphics

[Jens W. W. <je...@gm...>]

Hello,

I just committed some lightly tested code to our code repository. It
enables anti aliasing, but you have to tweak the configuration file to
turn it on: set video.multisamples in crrcsim.xml to one of 1,2,4,8,16
in order to turn it on. 0 means off.

It benefits the display of slender gliders a lot!

Link regarding implementation:
  http://www.sdltutorials.com/sdl-opengl-tutorial-basics
  
I had some stability problems on my system (linux, intel graphics) at first,
but now it seems to be ok. Details:

At once graphics seemed to hang, then continued with very slow frame rate.
dmesg said: 
  [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
  [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
Xorg said:
  [  4680.823] (EE) intel(0): Detected a hung GPU, disabling acceleration.
  [  4680.823] (EE) intel(0): When reporting this, please include i915_error_state from debugfs and the full dmesg.

Links:
  https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1160256
  https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1234100
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/946899
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1140716
  http://forum.ubuntuusers.de/topic/error-hangcheck-timer-elapsed-gpu-hung-sony-va/

Maybe passing "i915.i915_enable_rc6=0" helped in my case.  

Best regards, 
Jens