glTF addon: updates from upstream

* invalidate cache for multiple exports
* exporter: support KHR_lights_punctual
* fixed lights
* disable export all layers
* fixed texture slot images stalling export
* option to enable exporting more than 4 influences

from upsteam commit 26699c476211add92d13df0a284b8df2f08acb3e
to upstream commit 7a8f733fc446cfb3880a8c1658bccf94bcfd456c

1 files changed, 50 insertions, 0 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_light_spots.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_light_spots.py
new file mode 100644
index 00000000..6b1f95e2
--- /dev/null
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_light_spots.py
@@ -0,0 +1,50 @@
+# Copyright 2018 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.
+
+import bpy
+from typing import Optional, List, Any
+
+from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
+
+from io_scene_gltf2.io.com import gltf2_io_lights_punctual
+from io_scene_gltf2.io.com import gltf2_io_debug
+
+
+def gather_light_spot(blender_lamp, export_settings) -> Optional[gltf2_io_lights_punctual.LightSpot]:
+
+    if not __filter_light_spot(blender_lamp, export_settings):
+        return None
+
+    spot = gltf2_io_lights_punctual.LightSpot(
+        inner_cone_angle=__gather_inner_cone_angle(blender_lamp, export_settings),
+        outer_cone_angle=__gather_outer_cone_angle(blender_lamp, export_settings)
+    )
+    return spot
+
+
+def __filter_light_spot(blender_lamp, _) -> bool:
+    if blender_lamp.type != "SPOT":
+        return False
+
+    return True
+
+
+def __gather_inner_cone_angle(blender_lamp, _) -> Optional[float]:
+    angle = blender_lamp.spot_size * 0.5
+    return angle - angle * blender_lamp.spot_blend
+
+
+def __gather_outer_cone_angle(blender_lamp, _) -> Optional[float]:
+    return blender_lamp.spot_size * 0.5
+