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, 138 insertions, 0 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py
new file mode 100755
index 00000000..d801eca7
--- /dev/null
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py
@@ -0,0 +1,138 @@
+# 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.blender.exp.gltf2_blender_gather_cache import cached
+from io_scene_gltf2.io.com import gltf2_io
+from io_scene_gltf2.blender.exp import gltf2_blender_gather_texture_info
+from io_scene_gltf2.blender.exp import gltf2_blender_gather_material_normal_texture_info_class
+from io_scene_gltf2.blender.exp import gltf2_blender_gather_material_occlusion_texture_info_class
+
+from io_scene_gltf2.blender.exp import gltf2_blender_gather_materials_pbr_metallic_roughness
+from io_scene_gltf2.blender.exp import gltf2_blender_get
+
+
+@cached
+def gather_material(blender_material, export_settings):
+    """
+    Gather the material used by the blender primitive.
+
+    :param blender_material: the blender material used in the glTF primitive
+    :param export_settings:
+    :return: a glTF material
+    """
+    if not __filter_material(blender_material, export_settings):
+        return None
+
+    material = gltf2_io.Material(
+        alpha_cutoff=__gather_alpha_cutoff(blender_material, export_settings),
+        alpha_mode=__gather_alpha_mode(blender_material, export_settings),
+        double_sided=__gather_double_sided(blender_material, export_settings),
+        emissive_factor=__gather_emmissive_factor(blender_material, export_settings),
+        emissive_texture=__gather_emissive_texture(blender_material, export_settings),
+        extensions=__gather_extensions(blender_material, export_settings),
+        extras=__gather_extras(blender_material, export_settings),
+        name=__gather_name(blender_material, export_settings),
+        normal_texture=__gather_normal_texture(blender_material, export_settings),
+        occlusion_texture=__gather_occlusion_texture(blender_material, export_settings),
+        pbr_metallic_roughness=__gather_pbr_metallic_roughness(blender_material, export_settings)
+    )
+
+    return material
+    # material = blender_primitive['material']
+    #
+    #     if get_material_requires_texcoords(glTF, material) and not export_settings['gltf_texcoords']:
+    #         material = -1
+    #
+    #     if get_material_requires_normals(glTF, material) and not export_settings['gltf_normals']:
+    #         material = -1
+    #
+    #     # Meshes/primitives without material are allowed.
+    #     if material >= 0:
+    #         primitive.material = material
+    #     else:
+    #         print_console('WARNING', 'Material ' + internal_primitive[
+    #             'material'] + ' not found. Please assign glTF 2.0 material or enable Blinn-Phong material in export.')
+
+
+def __filter_material(blender_material, export_settings):
+    # if not blender_material.use_nodes:
+    #     return False
+    # if not blender_material.node_tree:
+    #     return False
+    return True
+
+
+def __gather_alpha_cutoff(blender_material, export_settings):
+    return None
+
+
+def __gather_alpha_mode(blender_material, export_settings):
+    return None
+
+
+def __gather_double_sided(blender_material, export_settings):
+    return None
+
+
+def __gather_emmissive_factor(blender_material, export_settings):
+    emissive = gltf2_blender_get.get_socket_or_texture_slot(blender_material, "Emissive")
+    if isinstance(emissive, bpy.types.NodeSocket):
+        return emissive.default_value
+    return None
+
+
+def __gather_emissive_texture(blender_material, export_settings):
+    emissive = gltf2_blender_get.get_socket_or_texture_slot(blender_material, "Emissive")
+    return gltf2_blender_gather_texture_info.gather_texture_info((emissive,), export_settings)
+
+
+def __gather_extensions(blender_material, export_settings):
+    extensions = {}
+
+
+    # TODO specular glossiness extension
+
+    return extensions if extensions else None
+
+
+def __gather_extras(blender_material, export_setttings):
+    return None
+
+
+def __gather_name(blender_material, export_settings):
+
+    return None
+
+
+def __gather_normal_texture(blender_material, export_settings):
+    normal = gltf2_blender_get.get_socket_or_texture_slot(blender_material, "Normal")
+    return gltf2_blender_gather_material_normal_texture_info_class.gather_material_normal_texture_info_class(
+        (normal,),
+        export_settings)
+
+
+def __gather_occlusion_texture(blender_material, export_settings):
+    emissive = gltf2_blender_get.get_socket_or_texture_slot(blender_material, "Occlusion")
+    return gltf2_blender_gather_material_occlusion_texture_info_class.gather_material_occlusion_texture_info_class(
+        (emissive,),
+        export_settings)
+
+
+def __gather_pbr_metallic_roughness(blender_material, export_settings):
+    return gltf2_blender_gather_materials_pbr_metallic_roughness.gather_material_pbr_metallic_roughness(
+        blender_material,
+        export_settings)
+