glsl: Treat an interface block specifier as a level of struct nesting

Fixes the piglit test:

   spec/glsl-1.50/compiler/interface-blocks-structs-defined-within-block-instanced.vert

Signed-off-by: Chris Forbes <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 92e0f90b81c..7ba04a808c2 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -5287,6 +5287,12 @@ ast_interface_block::hir(exec_list *instructions,
    bool block_row_major = this->layout.flags.q.row_major;
    exec_list declared_variables;
    glsl_struct_field *fields;
+
+   /* Treat an interface block as one level of nesting, so that embedded struct
+    * specifiers will be disallowed.
+    */
+   state->struct_specifier_depth++;
+
    unsigned int num_variables =
       ast_process_structure_or_interface_block(&declared_variables,
                                                state,
@@ -5298,6 +5304,8 @@ ast_interface_block::hir(exec_list *instructions,
                                                redeclaring_per_vertex,
                                                var_mode);
 
+   state->struct_specifier_depth--;
+
    if (!redeclaring_per_vertex)
       validate_identifier(this->block_name, loc, state);