add option for async loading glTF resources

thermion_dart/lib/src/viewer/src/ffi/src/thermion_dart.g.dart

@@ -652,7 +652,7 @@ external ffi.Pointer<TScene> SceneManager_getScene(
 
 @ffi.Native<
     EntityId Function(ffi.Pointer<TSceneManager>, ffi.Pointer<ffi.Uint8>,
-        ffi.Size, ffi.Bool, ffi.Int, ffi.Int)>(isLeaf: true)
+        ffi.Size, ffi.Bool, ffi.Int, ffi.Int, ffi.Bool)>(isLeaf: true)
 external int SceneManager_loadGlbFromBuffer(
   ffi.Pointer<TSceneManager> sceneManager,
   ffi.Pointer<ffi.Uint8> arg1,
@@ -660,6 +660,7 @@ external int SceneManager_loadGlbFromBuffer(
   bool keepData,
   int priority,
   int layer,
+  bool loadResourcesAsync,
 );
 
 @ffi.Native<
@@ -1515,6 +1516,7 @@ external void remove_skybox_render_thread(
             ffi.Bool,
             ffi.Int,
             ffi.Int,
+            ffi.Bool,
             ffi.Pointer<ffi.NativeFunction<ffi.Void Function(EntityId)>>)>(
     isLeaf: true)
 external void SceneManager_loadGlbFromBufferRenderThread(
@@ -1525,6 +1527,7 @@ external void SceneManager_loadGlbFromBufferRenderThread(
   bool keepData,
   int priority,
   int layer,
+  bool loadResourcesAsync,
   ffi.Pointer<ffi.NativeFunction<ffi.Void Function(EntityId)>> callback,
 );
 

thermion_dart/lib/src/viewer/src/ffi/src/thermion_viewer_ffi.dart

@@ -5,8 +5,8 @@ import 'package:animation_tools_dart/animation_tools_dart.dart';
 import 'package:thermion_dart/src/viewer/src/ffi/src/ffi_gizmo.dart';
 import 'package:vector_math/vector_math_64.dart';
 import 'package:vector_math/vector_math_64.dart' as v64;
-import '../../../../utils/gizmo.dart';
-import '../../../../utils/matrix.dart';
+import '../../../../utils/src/gizmo.dart';
+import '../../../../utils/src/matrix.dart';
 import '../../events.dart';
 import '../../shared_types/view.dart';
 import '../../thermion_viewer_base.dart';
@@ -546,7 +546,7 @@ class ThermionViewerFFI extends ThermionViewer {
       int numInstances = 1,
       bool keepData = false,
       int priority = 4,
-      int layer = 0}) async {
+      int layer = 0, bool loadResourcesAsync=false}) async {
     if (unlit) {
       throw Exception("Not yet implemented");
     }
@@ -557,7 +557,7 @@ class ThermionViewerFFI extends ThermionViewer {
 
     var entity = await withIntCallback((callback) =>
         SceneManager_loadGlbFromBufferRenderThread(_sceneManager!, data.address,
-            data.length, numInstances, keepData, priority, layer, callback));
+            data.length, numInstances, keepData, priority, layer, loadResourcesAsync, callback));
 
     if (entity == _FILAMENT_ASSET_ERROR) {
       throw Exception("An error occurred loading GLB from buffer");

thermion_dart/lib/src/viewer/src/thermion_viewer_base.dart

@@ -1,5 +1,5 @@
 import 'package:thermion_dart/src/viewer/src/events.dart';
-import '../../utils/gizmo.dart';
+import '../../utils/src/gizmo.dart';
 import 'shared_types/shared_types.dart';
 export 'shared_types/shared_types.dart';
 
@@ -56,8 +56,10 @@ abstract class ThermionViewer {
   ///
   /// Render a single frame and copy the pixel buffer to [out].
   ///
-  Future<Uint8List> capture({covariant SwapChain? swapChain,
-      covariant View? view, covariant RenderTarget? renderTarget});
+  Future<Uint8List> capture(
+      {covariant SwapChain? swapChain,
+      covariant View? view,
+      covariant RenderTarget? renderTarget});
 
   ///
   ///
@@ -214,12 +216,16 @@ abstract class ThermionViewer {
   /// Specify [numInstances] to create multiple instances (this is more efficient than dynamically instantating at a later time). You can then retrieve the created instances with [getInstances].
   /// If you want to be able to call [createInstance] at a later time, you must pass true for [keepData].
   /// If [keepData] is false, the source glTF data will be released and [createInstance] will throw an exception.
+  /// If [loadResourcesAsync] is true, resources (textures, materials, etc) will 
+  /// be loaded asynchronously (so expect some material/texture pop-in);
+  ///
   ///
   Future<ThermionEntity> loadGlbFromBuffer(Uint8List data,
       {int numInstances = 1,
       bool keepData = false,
       int priority = 4,
-      int layer = 0});
+      int layer = 0,
+      bool loadResourcesAsync});
 
   ///
   /// Create a new instance of [entity].