glsl: Don't lose precision qualifiers when encountering "centroid".

Mesa fails to retain the precision qualifier when parsing:

   #version 300 es
   centroid in mediump vec2 v;

Consider how the parser's type_qualifier production is applied.
First, the precision_qualifier rule creates a new ast_type_qualifier:

    <precision: mediump>

Then the storage_qualifier rule creates a second one:

    <flags: in>

and calls merge_qualifier() to fold in any previous qualifications,
returning:

    <flags: in, precision: mediump>

Finally, the auxiliary_storage_qualifier creates one for "centroid":

    <flags: centroid>

it then does $$ = $1 and $$.flags |= $2.flags, resulting in:

    <flags: centroid, in>

Since precision isn't stored in the flags bitfield, it is lost.  We need
to instead call merge_qualifier to combine all the fields.

Cc: [email protected]
Signed-off-by: Kenneth Graunke <[email protected]>
Reported-by: Kevin Rogovin <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index b26c2030fe1..dc35c1a51b3 100644
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -1494,7 +1494,7 @@ type_qualifier:
                           "just before storage qualifiers");
       }
       $$ = $1;
-      $$.flags.i |= $2.flags.i;
+      $$.merge_qualifier(&@1, state, $2);
    }
    | storage_qualifier type_qualifier
    {