glsl: Add support for the framebuffer fetch layout(noncoherent) qualifier.

This allows the application to request framebuffer fetch coherency
with per-fragment output granularity.  Coherent framebuffer fetch
outputs (which is the default if no qualifier is present for
compatibility with older versions of the EXT_shader_framebuffer_fetch
extension) will have ir_variable_data::memory_coherent set to true.

Reviewed-by: Plamena Manolova <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/compiler/glsl/glsl_parser.yy b/src/compiler/glsl/glsl_parser.yy
index 4faf9602a08..f1986ed0a8a 100644
--- a/src/compiler/glsl/glsl_parser.yy
+++ b/src/compiler/glsl/glsl_parser.yy
@@ -1587,6 +1587,12 @@ layout_qualifier_id:
          }
       }
 
+      if (!$$.flags.i &&
+          state->EXT_shader_framebuffer_fetch_non_coherent_enable) {
+         if (match_layout_qualifier($1, "noncoherent", state) == 0)
+            $$.flags.q.non_coherent = 1;
+      }
+
       if (!$$.flags.i) {
          _mesa_glsl_error(& @1, state, "unrecognized layout identifier "
                           "`%s'", $1);