glsl: Mark as active all elements of shared/std140 block arrays

Commit 1ca25ab (glsl: Do not eliminate 'shared' or 'std140' blocks
or block members) considered as active 'shared' and 'std140' uniform
blocks and uniform block arrays, but did not include the block array
elements. Because of that, it was possible to have an active uniform
block array without any elements marked as used, making the assertion
   ((b->num_array_elements > 0) == b->type->is_array())
in link_uniform_blocks() fail.

Fixes the following 5 dEQP tests:

 * dEQP-GLES3.functional.ubo.random.nested_structs_instance_arrays.18
 * dEQP-GLES3.functional.ubo.random.nested_structs_instance_arrays.24
 * dEQP-GLES3.functional.ubo.random.nested_structs_arrays_instance_arrays.19
 * dEQP-GLES3.functional.ubo.random.all_per_block_buffers.49
 * dEQP-GLES3.functional.ubo.random.all_shared_buffer.36

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=83508
Tested-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Timothy Arceri <t_arceri@yahoo.com.au>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/glsl/link_uniform_block_active_visitor.cpp b/src/glsl/link_uniform_block_active_visitor.cpp
index 72e0782..bcf17fe 100644
--- a/src/glsl/link_uniform_block_active_visitor.cpp
+++ b/src/glsl/link_uniform_block_active_visitor.cpp
@@ -104,6 +104,22 @@ link_uniform_block_active_visitor::visit(ir_variable *var)
    assert(b->num_array_elements == 0);
    assert(b->array_elements == NULL);
    assert(b->type != NULL);
+   assert(!b->type->is_array() || b->has_instance_name);
+
+   /* For uniform block arrays declared with a shared or std140 layout
+    * qualifier, mark all its instances as used.
+    */
+   if (b->type->is_array() && b->type->length > 0) {
+      b->num_array_elements = b->type->length;
+      b->array_elements = reralloc(this->mem_ctx,
+                                   b->array_elements,
+                                   unsigned,
+                                   b->num_array_elements);
+
+      for (unsigned i = 0; i < b->num_array_elements; i++) {
+         b->array_elements[i] = i;
+      }
+   }
 
    return visit_continue;
 }
@@ -145,6 +161,14 @@ link_uniform_block_active_visitor::visit_enter(ir_dereference_array *ir)
    assert((b->num_array_elements == 0) == (b->array_elements == NULL));
    assert(b->type != NULL);
 
+   /* If the block array was declared with a shared or
+    * std140 layout qualifier, all its instances have been already marked
+    * as used in link_uniform_block_active_visitor::visit(ir_variable *).
+    */
+   if (var->get_interface_type()->interface_packing !=
+       GLSL_INTERFACE_PACKING_PACKED)
+      return visit_continue_with_parent;
+
    ir_constant *c = ir->array_index->as_constant();
 
    if (c) {