1 files changed, 316 insertions, 0 deletions
diff --git a/io_scene_gltf2/io/exp/gltf2_io_get.py b/io_scene_gltf2/io/exp/gltf2_io_get.py
new file mode 100755
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+++ b/io_scene_gltf2/io/exp/gltf2_io_get.py
@@ -0,0 +1,316 @@
+# 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.
+
+#
+# Imports
+#
+
+import os
+
+#
+# Globals
+#
+
+#
+# Functions
+#
+
+
+def get_material_requires_texcoords(glTF, index):
+    """Query function, if a material "needs" texture coordinates. This is the case, if a texture is present and used."""
+    if glTF.materials is None:
+        return False
+
+    materials = glTF.materials
+
+    if index < 0 or index >= len(materials):
+        return False
+
+    material = materials[index]
+
+    # General
+
+    if material.emissive_texture is not None:
+        return True
+
+    if material.normal_texture is not None:
+        return True
+
+    if material.occlusion_texture is not None:
+        return True
+
+    # Metallic roughness
+
+    if material.pbr_metallic_roughness is not None and \
+            material.pbr_metallic_roughness.base_color_texture is not None:
+        return True
+
+    if material.pbr_metallic_roughness is not None and \
+            material.pbr_metallic_roughness.metallic_roughness_texture is not None:
+        return True
+
+    return False
+
+
+def get_material_requires_normals(glTF, index):
+    """
+    Query function, if a material "needs" normals. This is the case, if a texture is present and used.
+
+    At point of writing, same function as for texture coordinates.
+    """
+    return get_material_requires_texcoords(glTF, index)
+
+
+def get_material_index(glTF, name):
+    """Return the material index in the glTF array."""
+    if name is None:
+        return -1
+
+    if glTF.materials is None:
+        return -1
+
+    index = 0
+    for material in glTF.materials:
+        if material.name == name:
+            return index
+
+        index += 1
+
+    return -1
+
+
+def get_mesh_index(glTF, name):
+    """Return the mesh index in the glTF array."""
+    if glTF.meshes is None:
+        return -1
+
+    index = 0
+    for mesh in glTF.meshes:
+        if mesh.name == name:
+            return index
+
+        index += 1
+
+    return -1
+
+
+def get_skin_index(glTF, name, index_offset):
+    """Return the skin index in the glTF array."""
+    if glTF.skins is None:
+        return -1
+
+    skeleton = get_node_index(glTF, name)
+
+    index = 0
+    for skin in glTF.skins:
+        if skin.skeleton == skeleton:
+            return index + index_offset
+
+        index += 1
+
+    return -1
+
+
+def get_camera_index(glTF, name):
+    """Return the camera index in the glTF array."""
+    if glTF.cameras is None:
+        return -1
+
+    index = 0
+    for camera in glTF.cameras:
+        if camera.name == name:
+            return index
+
+        index += 1
+
+    return -1
+
+
+def get_light_index(glTF, name):
+    """Return the light index in the glTF array."""
+    if glTF.extensions is None:
+        return -1
+
+    extensions = glTF.extensions
+
+    if extensions.get('KHR_lights_punctual') is None:
+        return -1
+
+    khr_lights_punctual = extensions['KHR_lights_punctual']
+
+    if khr_lights_punctual.get('lights') is None:
+        return -1
+
+    lights = khr_lights_punctual['lights']
+
+    index = 0
+    for light in lights:
+        if light['name'] == name:
+            return index
+
+        index += 1
+
+    return -1
+
+
+def get_node_index(glTF, name):
+    """Return the node index in the glTF array."""
+    if glTF.nodes is None:
+        return -1
+
+    index = 0
+    for node in glTF.nodes:
+        if node.name == name:
+            return index
+
+        index += 1
+
+    return -1
+
+
+def get_scene_index(glTF, name):
+    """Return the scene index in the glTF array."""
+    if glTF.scenes is None:
+        return -1
+
+    index = 0
+    for scene in glTF.scenes:
+        if scene.name == name:
+            return index
+
+        index += 1
+
+    return -1
+
+
+def get_texture_index(glTF, filename):
+    """Return the texture index in the glTF array by a given file path."""
+    if glTF.textures is None:
+        return -1
+
+    image_index = get_image_index(glTF, filename)
+
+    if image_index == -1:
+        return -1
+
+    for texture_index, texture in enumerate(glTF.textures):
+        if image_index == texture.source:
+            return texture_index
+
+    return -1
+
+
+def get_image_index(glTF, filename):
+    """Return the image index in the glTF array."""
+    if glTF.images is None:
+        return -1
+
+    image_name = get_image_name(filename)
+
+    for index, current_image in enumerate(glTF.images):
+        if image_name == current_image.name:
+            return index
+
+    return -1
+
+
+def get_image_name(filename):
+    """Return user-facing, extension-agnostic name for image."""
+    return os.path.splitext(filename)[0]
+
+
+def get_scalar(default_value, init_value=0.0):
+    """Return scalar with a given default/fallback value."""
+    return_value = init_value
+
+    if default_value is None:
+        return return_value
+
+    return_value = default_value
+
+    return return_value
+
+
+def get_vec2(default_value, init_value=[0.0, 0.0]):
+    """Return vec2 with a given default/fallback value."""
+    return_value = init_value
+
+    if default_value is None or len(default_value) < 2:
+        return return_value
+
+    index = 0
+    for number in default_value:
+        return_value[index] = number
+
+        index += 1
+        if index == 2:
+            return return_value
+
+    return return_value
+
+
+def get_vec3(default_value, init_value=[0.0, 0.0, 0.0]):
+    """Return vec3 with a given default/fallback value."""
+    return_value = init_value
+
+    if default_value is None or len(default_value) < 3:
+        return return_value
+
+    index = 0
+    for number in default_value:
+        return_value[index] = number
+
+        index += 1
+        if index == 3:
+            return return_value
+
+    return return_value
+
+
+def get_vec4(default_value, init_value=[0.0, 0.0, 0.0, 1.0]):
+    """Return vec4 with a given default/fallback value."""
+    return_value = init_value
+
+    if default_value is None or len(default_value) < 4:
+        return return_value
+
+    index = 0
+    for number in default_value:
+        return_value[index] = number
+
+        index += 1
+        if index == 4:
+            return return_value
+
+    return return_value
+
+
+def get_index(elements, name):
+    """Return index of a glTF element by a given name."""
+    if elements is None or name is None:
+        return -1
+
+    index = 0
+    for element in elements:
+        if isinstance(element, dict):
+            if element.get('name') == name:
+                return index
+        else:
+            if element.name == name:
+                return index
+
+        index += 1
+
+    return -1
+