docs: add missing RADV_PERFTEST=video_decode

Fixes: 9477f117f4d ("radv/video: add initial frameworking.")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21158>

diff --git a/docs/envvars.rst b/docs/envvars.rst
index cc4e0c4..511f54a 100644 (file)
--- a/docs/envvars.rst
+++ b/docs/envvars.rst
@@ -1168,6 +1168,8 @@ RADV driver environment variables
       enable optimizations to move more driver internal objects to VRAM.
    ``rtwave64``
       enable wave64 for ray tracing shaders (GFX10+)
+   ``video_decode``
+      enable experimental video decoding support
 
 .. envvar:: RADV_TEX_ANISO