PyAPI: use postponed annotations to support Python 3.10

Support Python 3.10a5 or 3.9x with support explicitly enabled.

- Enable Python's postponed annotations for Blender's RNA classes
  types registered on startup.

- Using postponed annotations has implications for how they are defined,
  since they must evaluate in the modules name-space instead of the
  classes name-space. See changes to annotations in `release/scripts`.

- Use `from __future__ import annotations` at the top of the module
  to ensure the script will run with Python 3.10.

- Old logic is kept since it could be used if PEP-649 is supported.

Resolves T83626

Ref D10474

8 files changed, 11 insertions, 5 deletions

diff --git a/intern/cycles/blender/addon/__init__.py b/intern/cycles/blender/addon/__init__.py
index b1deb5cb64e..10b95133912 100644
--- a/intern/cycles/blender/addon/__init__.py
+++ b/intern/cycles/blender/addon/__init__.py
@@ -15,6 +15,7 @@
 #
 
 # <pep8 compliant>
+from __future__ import annotations
 
 bl_info = {
     "name": "Cycles Render Engine",
diff --git a/intern/cycles/blender/addon/engine.py b/intern/cycles/blender/addon/engine.py
index 7595261f523..dfa696714fb 100644
--- a/intern/cycles/blender/addon/engine.py
+++ b/intern/cycles/blender/addon/engine.py
@@ -15,6 +15,7 @@
 #
 
 # <pep8 compliant>
+from __future__ import annotations
 
 
 def _is_using_buggy_driver():
diff --git a/intern/cycles/blender/addon/operators.py b/intern/cycles/blender/addon/operators.py
index 087e5b666a5..dca727e316e 100644
--- a/intern/cycles/blender/addon/operators.py
+++ b/intern/cycles/blender/addon/operators.py
@@ -15,6 +15,7 @@
 #
 
 # <pep8 compliant>
+from __future__ import annotations
 
 import bpy
 from bpy.types import Operator
diff --git a/intern/cycles/blender/addon/osl.py b/intern/cycles/blender/addon/osl.py
index 4c6e7952491..d4c3c447951 100644
--- a/intern/cycles/blender/addon/osl.py
+++ b/intern/cycles/blender/addon/osl.py
@@ -15,6 +15,7 @@
 #
 
 # <pep8 compliant>
+from __future__ import annotations
 
 import bpy
 import _cycles
diff --git a/intern/cycles/blender/addon/presets.py b/intern/cycles/blender/addon/presets.py
index 78a8605e93f..04b18b38927 100644
--- a/intern/cycles/blender/addon/presets.py
+++ b/intern/cycles/blender/addon/presets.py
@@ -15,6 +15,7 @@
 #
 
 # <pep8 compliant>
+from __future__ import annotations
 
 from bl_operators.presets import AddPresetBase
 from bpy.types import Operator
diff --git a/intern/cycles/blender/addon/properties.py b/intern/cycles/blender/addon/properties.py
index dd218d93d32..0708c371a0e 100644
--- a/intern/cycles/blender/addon/properties.py
+++ b/intern/cycles/blender/addon/properties.py
@@ -15,6 +15,7 @@
 #
 
 # <pep8 compliant>
+from __future__ import annotations
 
 import bpy
 from bpy.props import (
@@ -841,7 +842,7 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
             ('MEGA', "Mega", ""),
             ('SPLIT', "Split", ""),
         ),
-        update=_devices_update_callback
+        update=CyclesRenderSettings._devices_update_callback
     )
 
     debug_opencl_device_type: EnumProperty(
@@ -855,11 +856,9 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
             ('GPU', "GPU", ""),
             ('ACCELERATOR', "Accelerator", ""),
         ),
-        update=_devices_update_callback
+        update=CyclesRenderSettings._devices_update_callback
     )
 
-    del _devices_update_callback
-
     debug_use_opencl_debug: BoolProperty(name="Debug OpenCL", default=False)
 
     debug_opencl_mem_limit: IntProperty(
@@ -1481,7 +1480,7 @@ class CyclesPreferences(bpy.types.AddonPreferences):
     compute_device_type: EnumProperty(
         name="Compute Device Type",
         description="Device to use for computation (rendering with Cycles)",
-        items=get_device_types,
+        items=CyclesPreferences.get_device_types,
     )
 
     devices: bpy.props.CollectionProperty(type=CyclesDeviceSettings)
diff --git a/intern/cycles/blender/addon/ui.py b/intern/cycles/blender/addon/ui.py
index 4576cf4e413..68f6291b373 100644
--- a/intern/cycles/blender/addon/ui.py
+++ b/intern/cycles/blender/addon/ui.py
@@ -15,6 +15,7 @@
 #
 
 # <pep8 compliant>
+from __future__ import annotations
 
 import bpy
 from bpy_extras.node_utils import find_node_input
diff --git a/intern/cycles/blender/addon/version_update.py b/intern/cycles/blender/addon/version_update.py
index cdff3c2b915..aeecc265399 100644
--- a/intern/cycles/blender/addon/version_update.py
+++ b/intern/cycles/blender/addon/version_update.py
@@ -15,6 +15,7 @@
 #
 
 # <pep8 compliant>
+from __future__ import annotations
 
 import bpy
 import math