Bump version to 0.12.15 in project and blender manifest files; add Apple Silicon support in properties.py

src/snapform/blender_manifest.toml

@@ -1,7 +1,7 @@
 schema_version = "1.0.0"
 
 id = "snapform"
-version = "0.12.14"
+version = "0.12.15"
 name = "SnapForm"
 tagline = "Build spatial structures from images, fast"
 maintainer = "OmooLab"

src/snapform/properties.py

@@ -1,4 +1,7 @@
+import functools
 import platform
+import re
+import subprocess
 import sys
 
 import bpy
@@ -21,18 +24,50 @@ DEVICE_LABELS = {
 }
 
 
-def supported_devices():
-    devices = runtime.environment_manifest().get("devices")
-    if isinstance(devices, list) and devices:
-        return [str(device).lower() for device in devices]
-    if sys.platform == "win32":
-        return ["directml", "cpu"]
-    if sys.platform == "darwin" and platform.machine().lower() in {
+APPLE_SILICON_PATTERN = re.compile(r"\bApple M(\d+)\b", re.IGNORECASE)
+
+
+def parse_apple_silicon_generation(brand):
+    match = APPLE_SILICON_PATTERN.search(str(brand))
+    return int(match.group(1)) if match else None
+
+
+@functools.lru_cache(maxsize=1)
+def apple_silicon_generation():
+    if sys.platform != "darwin" or platform.machine().lower() not in {
         "arm64",
         "aarch64",
     }:
-        return ["mps", "cpu"]
-    return ["cpu"]
+        return None
+    try:
+        result = subprocess.run(
+            ("sysctl", "-n", "machdep.cpu.brand_string"),
+            check=True,
+            capture_output=True,
+            text=True,
+            timeout=2,
+        )
+    except (OSError, subprocess.SubprocessError):
+        return None
+    return parse_apple_silicon_generation(result.stdout)
+
+
+def supports_mps(generation=None):
+    if generation is None:
+        generation = apple_silicon_generation()
+    return generation is not None and generation >= 4
+
+
+def supported_devices():
+    devices = runtime.environment_manifest().get("devices")
+    if isinstance(devices, list) and devices:
+        names = [str(device).lower() for device in devices]
+        if not supports_mps():
+            names = [name for name in names if name != "mps"]
+        return names or ["cpu"]
+    if sys.platform == "win32":
+        return ["directml", "cpu"]
+    return ["mps", "cpu"] if supports_mps() else ["cpu"]
 
 
 def device_enum_items(_owner, _context):