[Mesa-dev] [RFC PATCH 16/26] glsl: allow image qualifiers inside structures

[Samuel Pitoiset]

The GL_ARB_bindless_texture allows to declare images inside
structures which means that qualifiers like writeonly should
be allowed.

I have a got a confirmation from Jeff Bolz (one author of the spec),
because the spec doesn't clearly explain this.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
---
 src/compiler/glsl/glsl_parser.yy | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/src/compiler/glsl/glsl_parser.yy b/src/compiler/glsl/glsl_parser.yy
index 9cdc37eb9a..05171e53a3 100644
--- a/src/compiler/glsl/glsl_parser.yy
+++ b/src/compiler/glsl/glsl_parser.yy
@@ -2409,10 +2409,30 @@ struct_declaration:
       ast_fully_specified_type *const type = $1;
       type->set_location(@1);
 
-      if (type->qualifier.flags.i != 0)
-         _mesa_glsl_error(&@1, state,
-			  "only precision qualifiers may be applied to "
-			  "structure members");
+      if (state->has_bindless()) {
+         ast_type_qualifier input_layout_mask;
+
+         /* Allow to declare qualifiers for images as specified by
+          * GL_ARB_bindless_texture. */
+         input_layout_mask.flags.i = 0;
+         input_layout_mask.flags.q.coherent = 1;
+         input_layout_mask.flags.q._volatile = 1;
+         input_layout_mask.flags.q.restrict_flag = 1;
+         input_layout_mask.flags.q.read_only = 1;
+         input_layout_mask.flags.q.write_only = 1;
+         input_layout_mask.flags.q.explicit_image_format = 1;
+
+         if ((type->qualifier.flags.i & ~input_layout_mask.flags.i) != 0) {
+            _mesa_glsl_error(&@1, state,
+                             "only precision and image qualifiers may be "
+                             "applied to structure members");
+         }
+      } else {
+         if (type->qualifier.flags.i != 0)
+            _mesa_glsl_error(&@1, state,
+                             "only precision qualifiers may be applied to "
+                             "structure members");
+      }
 
       $$ = new(ctx) ast_declarator_list(type);
       $$->set_location(@2);
-- 
2.12.2