gallium/docs: clarify gen_name/get_vendor/get_device_vendor behavior

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index 852c31b..288fb5c 100644 (file)
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -624,17 +624,26 @@ get_name
 
 Returns an identifying name for the screen.
 
+The returned string should remain valid and immutable for the lifetime of
+pipe_screen.
+
 get_vendor
 ^^^^^^^^^^
 
 Returns the screen vendor.
 
+The returned string should remain valid and immutable for the lifetime of
+pipe_screen.
+
 get_device_vendor
 ^^^^^^^^^^^^^^^^^
 
 Returns the actual vendor of the device driving the screen
 (as opposed to the driver vendor).
 
+The returned string should remain valid and immutable for the lifetime of
+pipe_screen.
+
 .. _get_param:
 
 get_param