gallium/docs: document that TXF is used with PIPE_BUFFER resources

Reviewed-by: Roland Scheidegger <sroland@vmware.com>

diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index fab001293e4a9a1b057995dc289c147af090e62d..6214de3df0170a05bb745b2532753538dce14972 100644 (file)
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -939,7 +939,8 @@ XXX doesn't look like most of the opcodes really belong here.
 .. opcode:: TXF - Texel Fetch
 
   As per NV_gpu_shader4, extract a single texel from a specified texture
-  image. The source sampler may not be a CUBE or SHADOW.  src 0 is a
+  image or PIPE_BUFFER resource. The source sampler may not be a CUBE or
+  SHADOW.  src 0 is a
   four-component signed integer vector used to identify the single texel
   accessed. 3 components + level.  Just like texture instructions, an optional
   offset vector is provided, which is subject to various driver restrictions