glTF exporter: define a user extension API

1 files changed, 23 insertions, 0 deletions

diff --git a/io_scene_gltf2/io/exp/gltf2_io_user_extensions.py b/io_scene_gltf2/io/exp/gltf2_io_user_extensions.py
new file mode 100644
index 00000000..f8f5e883
--- /dev/null
+++ b/io_scene_gltf2/io/exp/gltf2_io_user_extensions.py
@@ -0,0 +1,23 @@
+# Copyright 2019 The glTF-Blender-IO authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+def export_user_extensions(hook_name, export_settings, gltf2_object, *args):
+    if gltf2_object.extensions is None:
+        gltf2_object.extensions = {}
+
+    for extension in export_settings['gltf_user_extensions']:
+        hook = getattr(extension, hook_name, None)
+        if hook is not None:
+            hook(gltf2_object, *args, export_settings)
+