docs: Clarify PIPE_TEXTURE_USAGE_DYNAMIC.

diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index bac63135b5179b147fd8b3125e5e2d614ed31626..72bb75a55dc81511d078eda47187fa0b272423ff 100644 (file)
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -23,7 +23,7 @@ texture that can be used as multiple things.
   validated here is implicitly also a depthbuffer.
 * ``SAMPLER``: A texture that may be sampled from in a fragment or vertex
   shader.
-* ``DYNAMIC``: XXX undefined
+* ``DYNAMIC``: A texture that will be mapped frequently.
 
 Methods
 -------
@@ -59,6 +59,10 @@ See if a format can be used in a specific manner.
 
 Returns TRUE if all usages can be satisfied.
 
+.. note::
+
+   ``PIPE_TEXTURE_USAGE_DYNAMIC`` is not a valid usage.
+
 texture_create
 ^^^^^^^^^^^^^^