Initial commit of glTF 2.0 importer/exporter

Official Khronos Group Blender glTF 2.0 importer and exporter.

glTF specification: https://github.com/KhronosGroup/glTF
The upstream repository can be found here:
https://github.com/KhronosGroup/glTF-Blender-IO

Reviewed By: Bastien, Campbell

Differential Revision: https://developer.blender.org/D3929

1 files changed, 98 insertions, 0 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_sampler.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_sampler.py
new file mode 100755
index 00000000..840c98f4
--- /dev/null
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_sampler.py
@@ -0,0 +1,98 @@
+# 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 io_scene_gltf2.io.com import gltf2_io
+from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
+
+
+@cached
+def gather_sampler(blender_shader_node: bpy.types.Node, export_settings):
+    if not __filter_sampler(blender_shader_node, export_settings):
+        return None
+
+    return gltf2_io.Sampler(
+        extensions=__gather_extensions(blender_shader_node, export_settings),
+        extras=__gather_extras(blender_shader_node, export_settings),
+        mag_filter=__gather_mag_filter(blender_shader_node, export_settings),
+        min_filter=__gather_min_filter(blender_shader_node, export_settings),
+        name=__gather_name(blender_shader_node, export_settings),
+        wrap_s=__gather_wrap_s(blender_shader_node, export_settings),
+        wrap_t=__gather_wrap_t(blender_shader_node, export_settings)
+    )
+
+
+def __filter_sampler(blender_shader_node, export_settings):
+    if not blender_shader_node.interpolation == 'Closest' and not blender_shader_node.extension == 'CLIP':
+        return False
+    return True
+
+
+def __gather_extensions(blender_shader_node, export_settings):
+    return None
+
+
+def __gather_extras(blender_shader_node, export_settings):
+    return None
+
+
+def __gather_mag_filter(blender_shader_node, export_settings):
+    if blender_shader_node.interpolation == 'Closest':
+        return 9728  # NEAREST
+    return 9729  # LINEAR
+
+
+def __gather_min_filter(blender_shader_node, export_settings):
+    if blender_shader_node.interpolation == 'Closest':
+        return 9984  # NEAREST_MIPMAP_NEAREST
+    return 9986  # NEAREST_MIPMAP_LINEAR
+
+
+def __gather_name(blender_shader_node, export_settings):
+    return None
+
+
+def __gather_wrap_s(blender_shader_node, export_settings):
+    if blender_shader_node.extension == 'CLIP':
+        return 33071
+    return None
+
+
+def __gather_wrap_t(blender_shader_node, export_settings):
+    if blender_shader_node.extension == 'CLIP':
+        return 33071
+    return None
+
+
+@cached
+def gather_sampler_from_texture_slot(blender_texture: bpy.types.TextureSlot, export_settings):
+    magFilter = 9729
+    wrap = 10497
+    if blender_texture.texture.extension == 'CLIP':
+        wrap = 33071
+
+    minFilter = 9986
+    if magFilter == 9728:
+        minFilter = 9984
+
+    return gltf2_io.Sampler(
+        extensions=None,
+        extras=None,
+        mag_filter=magFilter,
+        min_filter=minFilter,
+        name=None,
+        wrap_s=wrap,
+        wrap_t=wrap
+    )
+