WIP: KHR_texture_basisu import management

addons/io_scene_gltf2/__init__.py

@@ -1957,6 +1957,15 @@ class ImportGLTF2(Operator, ConvertGLTF2_Base, ImportHelper):
         default=False,
     )
 
+    import_ktx_texture: BoolProperty(
+        name='Import KTX Textures',
+        description=(
+            "If a texture exists in KTX format, "
+            "loads the KTX texture instead of the fallback PNG/JPEG one"
+        ),
+        default=False,
+    )
+
     import_unused_materials: BoolProperty(
         name='Import Unused Materials & Images',
         description='Import materials & Images not assigned to any mesh',
@@ -2129,6 +2138,7 @@ def import_texture_panel(layout, operator):
     if body:
         body.prop(operator, 'import_pack_images')
         body.prop(operator, 'import_webp_texture')
+        body.prop(operator, 'import_ktx_texture')
         body.prop(operator, 'import_unused_materials')
 
 

addons/io_scene_gltf2/blender/imp/texture.py

@@ -215,10 +215,17 @@ def get_source(mh, pytexture):
     except Exception:
         webp_src = None
 
+    try:
+        ktx_src = pytexture.extensions['KHR_texture_basisu']['source']
+    except Exception:
+        ktx_src = None
+
     if mh.gltf.import_settings['import_webp_texture']:
         return webp_src if webp_src is not None else src
+    elif mh.gltf.import_settings['import_ktx_texture']:
+        return ktx_src if ktx_src is not None else src
     else:
-        return src if src is not None else webp_src
+        return src if src is not None else webp_src if webp_src is not None else ktx_src
 
 
 def set_filtering(tex_img, pysampler):

addons/io_scene_gltf2/io/imp/gltf2_io_gltf.py

@@ -66,6 +66,7 @@ def __init__(self, filename, import_settings):
             'KHR_animation_pointer',
             'KHR_materials_volume',
             'EXT_texture_webp',
+            "KHR_texture_basisu",
             'KHR_materials_anisotropy',
             'KHR_materials_dispersion',
             'KHR_materials_iridescence',