add free() method for stability on Windows

ios/include/FlutterFilamentApi.h

@@ -163,6 +163,7 @@ FLUTTER_PLUGIN_EXPORT void set_post_processing(void* const viewer, bool enabled)
 FLUTTER_PLUGIN_EXPORT void pick(void* const viewer, int x, int y, EntityId* entityId);
 FLUTTER_PLUGIN_EXPORT const char* get_name_for_entity(void* const assetManager, const EntityId entityId);
 FLUTTER_PLUGIN_EXPORT void ios_dummy();
+FLUTTER_PLUGIN_EXPORT void flutter_filament_free(void* ptr);
 #ifdef __cplusplus
 }
 #endif

ios/src/FlutterFilamentApi.cpp

@@ -445,4 +445,11 @@ extern "C"
     {
         Log("Dummy called");
     }
+
+    FLUTTER_PLUGIN_EXPORT void flutter_filament_free(void* ptr)
+    {
+        free(ptr);
+    }
+
+
 }

lib/filament_controller_ffi.dart

@@ -1015,7 +1015,7 @@ class FilamentControllerFFI extends FilamentController {
 
     var position = modelMatrix.getColumn(3).xyz;
 
-    calloc.free(arrayPtr);
+    flutter_filament_free(arrayPtr.cast<Void>());
     return position;
   }
 
@@ -1029,7 +1029,7 @@ class FilamentControllerFFI extends FilamentController {
     var modelMatrix = Matrix4.fromFloat64List(doubleList);
     var rotationMatrix = Matrix3.identity();
     modelMatrix.copyRotation(rotationMatrix);
-    calloc.free(arrayPtr);
+    flutter_filament_free(arrayPtr.cast<Void>());
     return rotationMatrix;
   }