Mesa (master): Add driver override to envvars.rst

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Module: Mesa
Branch: master
Commit: f5901484a773765dc19a473320e5b6b2575f2cd6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f5901484a773765dc19a473320e5b6b2575f2cd6

Author: Jan Ziak <0xe2.0x9a.0x9b at gmail.com>
Date:   Tue Sep 29 14:38:03 2020 +0000

Add driver override to envvars.rst

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6911>

---

 docs/envvars.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/envvars.rst b/docs/envvars.rst
index fa414bd347b..2395406c95b 100644
--- a/docs/envvars.rst
+++ b/docs/envvars.rst
@@ -180,6 +180,8 @@ Core Mesa environment variables
       instance version as advertised by ``vkEnumerateInstanceVersion``
    -  This can be very useful for debugging but some features may not be
       implemented correctly. (For developers only)
+``MESA_LOADER_DRIVER_OVERRIDE``
+   chooses a different driver binary such as ``etnaviv`` or ``zink``.
 
 NIR passes environment variables
 --------------------------------