Merge branch 'holzer-master-patch-a261' into 'master'

[Fix] Usage of field data in generated BC

See merge request walberla/walberla!664

python/lbmpy_walberla/templates/BoundaryCollection.tmpl.h

@@ -46,7 +46,7 @@ class {{class_name}}
    {
       {% for object_name, boundary_class, kernel, additional_data_handler in zip(object_names, boundary_classes, kernel_list, additional_data_handlers) -%}
 
-      {{object_name}} = std::make_shared< {{boundary_class}} >({{- ["blocks", "pdfsID", [kernel|generate_function_collection_call(['indexVector', 'indexVectorSize', 'pdfs', 'timestep', 'gpuStream'])], additional_data_handler.constructor_argument_name] | type_identifier_list -}});
+      {{object_name}} = std::make_shared< {{boundary_class}} >({{- ["blocks", "pdfsID", [kernel|generate_function_collection_call(['indexVector', 'indexVectorSize', 'pdfs', 'timestep', 'gpuStream'], use_field_ids=True)], additional_data_handler.constructor_argument_name] | type_identifier_list -}});
       {% endfor %}
 
       {% for object_name, flag_uid in zip(object_names, flag_uids) -%}

python/pystencils_walberla/jinja_filters.py

@@ -378,21 +378,40 @@ def get_end_coordinates(field_object):
 
 
 @jinja2_context_decorator
-def generate_function_collection_call(ctx, kernel_info, parameters_to_ignore=(), cell_interval=None, ghost_layers=None):
+def generate_function_collection_call(ctx, kernel, parameters_to_ignore=(),
+                                      cell_interval=None, ghost_layers=None, use_field_ids=False):
+
+    """Generates the function call to a pystencils kernel. It can be understood as a lightweight version of
+       `generate_call`. Thus, it will only generate the parameters needed to call the kernel as a list of strings.
+
+    Args:
+        ctx: code generation context
+        kernel: pystencils kernel
+        parameters_to_ignore: In some cases not all parameters need to be printed. This is especially the case when
+                              fixed parameters exist that are hardcoded in the jinja template.
+        cell_interval: Defines the name (string) of a walberla CellInterval object in scope.
+        ghost_layers: Defines the name (string) of a variable to define the number of used ghost_layers.
+        use_field_ids: If set to true field names will be printed with the suffix `ID_`, to indicated that
+                       a BlockDataID is passed.
+    """
+
     target = translate_target(ctx['target'])
     is_gpu = target == Target.GPU
 
     parameters = []
-    for param in kernel_info.parameters:
+    for param in kernel.parameters:
         if param.is_field_pointer and param.field_name not in parameters_to_ignore:
-            parameters.append(param.field_name)
+            if use_field_ids:
+                parameters.append(f"{param.field_name}ID_")
+            else:
+                parameters.append(param.field_name)
 
-    for param in kernel_info.parameters:
+    for param in kernel.parameters:
         if not param.is_field_parameter and param.symbol.name not in parameters_to_ignore:
             parameters.append(param.symbol.name)
 
     # TODO due to backward compatibility with high level interface spec
-    for parameter in kernel_info.kernel_selection_tree.get_selection_parameter_list():
+    for parameter in kernel.kernel_selection_tree.get_selection_parameter_list():
         if parameter.name not in parameters_to_ignore:
             parameters.append(parameter.name)