Mesa (main): docs: add the doc-comment for fse-vars

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Module: Mesa
Branch: main
Commit: 4fd9c6d9f35046d65c1751678e72a538dce72774
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=4fd9c6d9f35046d65c1751678e72a538dce72774

Author: Erik Faye-Lund <erik.faye-lund at collabora.com>
Date:   Tue Jun  1 12:22:00 2021 +0200

docs: add the doc-comment for fse-vars

This just copies the comment that's in the code where this state is
stored. It seems better than nothing.

Reviewed-by: Chia-I Wu <olvaffe at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11106>

---

 docs/envvars.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/docs/envvars.rst b/docs/envvars.rst
index 20e090e7f9c..bdaa9b341b6 100644
--- a/docs/envvars.rst
+++ b/docs/envvars.rst
@@ -410,9 +410,10 @@ Gallium environment variables
    if set, do extra sanity checking on TGSI shaders and print any errors
    to stderr.
 :envvar:`DRAW_FSE`
-   ???
+   Enable fetch-shade-emit middle-end even though its not correct (e.g.
+   for softpipe)
 :envvar:`DRAW_NO_FSE`
-   ???
+   Disable fetch-shade-emit middle-end even when it is correct
 :envvar:`DRAW_USE_LLVM`
    if set to zero, the draw module will not use LLVM to execute shaders,
    vertex fetch, etc.