Add HW context support to i915 [FreeBSD WIKI]

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====== Add HW context support to i915 driver ======

Starting with Gen6 (Sandy Bridge), Mesa 9.2+ relies on hardware context switching in the i915 driver.

===== Status =====

<callout type="warning">
**Project finished**

The code is in HEAD and stable/10 and a merge to stale/9 is pending.

See [[/Graphics]] for further informations.
</callout>

===== How to test =====

We're insterested in test reports (success or failure) on any GPU (even non-Intel).

  - Install Mesa 10.3 from the [[/Graphics#experimental|"experimental" branch]] of the xorg-dev repository. You need to rebuild at least the following ports:
    * ''%%graphics/libdrm%%''
    * ''%%graphics/libglapi%%''
    * ''%%graphics/libGL%%''
    * ''%%graphics/dri%%''
  - Check if Mesa complains about missing hw context:

<code>
# glxinfo
name of display: :0.0
Gen6+ requires Kernel 3.6 or later.
Assertion failed: (ctx->Version > 0), function handle_first_current, file ../../src/mesa/main/context.c, line 1498.
Abort (core dumped)
</code>

  - Clone the Git branch or apply the patch to your local source tree
  - Build and install kernel
  - Reboot
  - Re-run glxinfo

<code>
# glxinfo
name of display: :0
display: :0  screen: 0
direct rendering: Yes
...
OpenGL renderer string: Mesa DRI Intel(R) 965GM 
OpenGL version string: 2.1 Mesa 10.2.4
...
</code>

  - Play with your usual GL applications.

Please report any success or failure by following the [[/Graphics#Reporting|instructions on the Graphics portal]].