feat: add setGizmoVisibility/pickGizmo methods to ThermionViewer

thermion_dart/lib/thermion_dart/thermion_viewer.dart

@@ -72,6 +72,11 @@ abstract class ThermionViewer {
   ///
   Stream<FilamentPickResult> get pickResult;
 
+  ///
+  /// The result(s) of calling [pickGizmo] (see below).
+  ///
+  Stream<FilamentPickResult> get gizmoPickResult;
+
   ///
   /// Whether the controller is currently rendering at [framerate].
   ///
@@ -137,11 +142,17 @@ abstract class ThermionViewer {
   Future removeSkybox();
 
   ///
-  /// Loads an image-based light from the specified path at the given intensity.
-  /// Only one IBL can be active at any given time; if an IBL has already been loaded, it will be replaced.
+  /// Creates an indirect light by loading the reflections/irradiance from the KTX file.
+  /// Only one indirect light can be active at any given time; if an indirect light has already been loaded, it will be replaced.
   ///
   Future loadIbl(String lightingPath, {double intensity = 30000});
 
+  ///
+  /// Creates a indirect light with the given color.
+  /// Only one indirect light can be active at any given time; if an indirect light has already been loaded, it will be replaced.
+  ///
+  Future createIbl(double r, double g, double b, double intensity);
+
   ///
   /// Rotates the IBL & skybox.
   ///
@@ -648,6 +659,14 @@ abstract class ThermionViewer {
   ///
   void pick(int x, int y);
 
+  ///
+  /// Used to test whether a Gizmo is at the given viewport coordinates.
+  /// Called by `FilamentGestureDetector` on a mouse/finger down event. You probably don't want to call this yourself.
+  /// This is asynchronous and will require 2-3 frames to complete - subscribe to the [gizmoPickResult] stream to receive the results of this method.
+  /// [x] and [y] must be in local logical coordinates (i.e. where 0,0 is at top-left of the ThermionWidget).
+  ///
+  void pickGizmo(int x, int y);
+
   ///
   /// Retrieves the name assigned to the given ThermionEntity (usually corresponds to the glTF mesh name).
   ///
@@ -773,4 +792,9 @@ abstract class ThermionViewer {
   /// Use this method to toggle visibility of the respective layer.
   ///
   Future setLayerEnabled(int layer, bool enabled);
+
+  ///
+  /// Show/hide the translation gizmo.
+  ///
+  Future setGizmoVisibility(bool visible);
 }

thermion_dart/lib/thermion_dart/thermion_viewer_ffi.dart

@@ -43,6 +43,12 @@ class ThermionViewerFFI extends ThermionViewer {
   final _pickResultController =
       StreamController<FilamentPickResult>.broadcast();
 
+  @override
+  Stream<FilamentPickResult> get gizmoPickResult =>
+      _gizmoPickResultController.stream;
+  final _gizmoPickResultController =
+      StreamController<FilamentPickResult>.broadcast();
+
   final Pointer<Void> resourceLoader;
 
   var _driver = nullptr.cast<Void>();
@@ -67,14 +73,15 @@ class ThermionViewerFFI extends ThermionViewer {
     this._renderCallback = renderCallback ?? nullptr;
     this._driver = driver ?? nullptr;
     this._sharedContext = sharedContext ?? nullptr;
-    try {
-      _onPickResultCallable = NativeCallable<
-          Void Function(
-              EntityId entityId, Int x, Int y)>.listener(_onPickResult);
-    } catch (err) {
-      _logger.severe(
-          "Failed to set pick result callback. This is expected if running on web/wasm");
-    }
+
+    _onPickResultCallable =
+        NativeCallable<Void Function(EntityId entityId, Int x, Int y)>.listener(
+            _onPickResult);
+
+    _onGizmoPickResultCallable =
+        NativeCallable<Void Function(EntityId entityId, Int x, Int y)>.listener(
+            _onGizmoPickResult);
+
     _initialize();
   }
 
@@ -277,6 +284,14 @@ class ThermionViewerFFI extends ThermionViewer {
     allocator.free(pathPtr);
   }
 
+  ///
+  ///
+  ///
+  @override
+  Future createIbl(double r, double g, double b, double intensity) async {
+    create_ibl(_viewer!, r, g, b, intensity);
+  }
+
   ///
   ///
   ///
@@ -1379,8 +1394,18 @@ class ThermionViewerFFI extends ThermionViewer {
     _scene!.registerSelected(entityId);
   }
 
+  void _onGizmoPickResult(ThermionEntity entityId, int x, int y) {
+    _gizmoPickResultController.add((
+      entity: entityId,
+      x: (x / pixelRatio).toDouble(),
+      y: (viewportDimensions.$2 - y) / pixelRatio
+    ));
+  }
+
   late NativeCallable<Void Function(EntityId entityId, Int x, Int y)>
       _onPickResultCallable;
+  late NativeCallable<Void Function(EntityId entityId, Int x, Int y)>
+      _onGizmoPickResultCallable;
 
   ///
   ///
@@ -1395,6 +1420,16 @@ class ThermionViewerFFI extends ThermionViewer {
     filament_pick(_viewer!, x, y, _onPickResultCallable.nativeFunction);
   }
 
+  ///
+  ///
+  ///
+  @override
+  void pickGizmo(int x, int y) async {
+    x = (x * pixelRatio).ceil();
+    y = (viewportDimensions.$2 - (y * pixelRatio)).ceil();
+    pick_gizmo(_sceneManager!, x, y, _onGizmoPickResultCallable.nativeFunction);
+  }
+
   ///
   ///
   ///
@@ -1768,4 +1803,11 @@ class ThermionViewerFFI extends ThermionViewer {
   Future setLayerEnabled(int layer, bool enabled) async {
     set_layer_enabled(_sceneManager!, layer, enabled);
   }
+
+  ///
+  ///
+  ///
+  Future setGizmoVisibility(bool visible) async {
+    set_gizmo_visibility(_sceneManager!, visible);
+  }
 }