meson: Move all code generation scripts to utils/codegen/

We have multiple code generation scripts in utils/, mixed with other
miscellaneous utilities, as well as a larger code base based on mojom in
utils/ipc/. To make code sharing easier between the generator scripts,
without creating a mess in the utils/ directory, move all the code
generation code to utils/codegen/.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

utils/codegen/ipc/generators/libcamera_templates/definition_functions.tmpl

@@ -0,0 +1,56 @@
+{#-
+ # SPDX-License-Identifier: LGPL-2.1-or-later
+ # Copyright (C) 2020, Google Inc.
+-#}
+
+{#
+ # \brief Generate enum definition
+ #
+ # \param enum Enum object whose definition is to be generated
+ #}
+{%- macro define_enum(enum) -%}
+enum{{" class" if enum|is_scoped}} {{enum.mojom_name}} {
+{%- for field in enum.fields %}
+	{{field.mojom_name}} = {{field.numeric_value}},
+{%- endfor %}
+};
+{%- endmacro -%}
+
+{#
+ # \brief Generate struct definition
+ #
+ # \param struct Struct object whose definition is to be generated
+ #}
+{%- macro define_struct(struct) -%}
+struct {{struct.mojom_name}}
+{
+public:
+#ifndef __DOXYGEN__
+	{{struct.mojom_name}}() {%- if struct|has_default_fields %}
+		:{% endif %}
+{%- for field in struct.fields|with_default_values -%}
+{{" " if loop.first}}{{field.mojom_name}}({{field|default_value}}){{", " if not loop.last}}
+{%- endfor %}
+	{
+	}
+
+	{{struct.mojom_name}}(
+{%- for field in struct.fields -%}
+{{"const " if not field|is_pod}}{{field|name}} {{"&" if not field|is_pod}}_{{field.mojom_name}}{{", " if not loop.last}}
+{%- endfor -%}
+)
+		:
+{%- for field in struct.fields -%}
+{{" " if loop.first}}{{field.mojom_name}}(_{{field.mojom_name}}){{", " if not loop.last}}
+{%- endfor %}
+	{
+	}
+#endif
+
+{% for field in struct.fields %}
+	{{field|name}} {{field.mojom_name}};
+{%- endfor %}
+};
+{%- endmacro -%}
+
+