+
+bool
+ast_type_qualifier::merge_qualifier(YYLTYPE *loc,
+ _mesa_glsl_parse_state *state,
+ ast_type_qualifier q)
+{
+ ast_type_qualifier ubo_mat_mask;
+ ubo_mat_mask.flags.i = 0;
+ ubo_mat_mask.flags.q.row_major = 1;
+ ubo_mat_mask.flags.q.column_major = 1;
+
+ ast_type_qualifier ubo_layout_mask;
+ ubo_layout_mask.flags.i = 0;
+ ubo_layout_mask.flags.q.std140 = 1;
+ ubo_layout_mask.flags.q.packed = 1;
+ ubo_layout_mask.flags.q.shared = 1;
+
+ /* Uniform block layout qualifiers get to overwrite each
+ * other (rightmost having priority), while all other
+ * qualifiers currently don't allow duplicates.
+ */
+
+ if ((this->flags.i & q.flags.i & ~(ubo_mat_mask.flags.i |
+ ubo_layout_mask.flags.i)) != 0) {
+ _mesa_glsl_error(loc, state,
+ "duplicate layout qualifiers used\n");
+ return false;
+ }
+
+ if ((q.flags.i & ubo_mat_mask.flags.i) != 0)
+ this->flags.i &= ~ubo_mat_mask.flags.i;
+ if ((q.flags.i & ubo_layout_mask.flags.i) != 0)
+ this->flags.i &= ~ubo_layout_mask.flags.i;
+
+ this->flags.i |= q.flags.i;
+
+ if (q.flags.q.explicit_location)
+ this->location = q.location;
+
+ if (q.flags.q.explicit_index)
+ this->index = q.index;
+
+ return true;
+}
+