glsl: Add comment explaining "row_major" parsing.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index 935eb2d83e4f6a09eedbef4f289b0a18a0317768..afbafce4cba449c5b2b9b31516c628f3025395f2 100644 (file)
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -1155,6 +1155,12 @@ layout_qualifier_id:
                 $$.flags.q.shared = 1;
              } else if (strcmp($1, "column_major") == 0) {
                 $$.flags.q.column_major = 1;
+             /* "row_major" is a reserved word in GLSL 1.30+. Its token is parsed
+              * below in the interface_block_layout_qualifier rule.
+              *
+              * It is not a reserved word in GLSL ES 3.00, so it's handled here as
+              * an identifier.
+              */
              } else if (strcmp($1, "row_major") == 0) {
                 $$.flags.q.row_major = 1;
              }