refactor: continual refactor to support multiple render targets

thermion_dart/lib/src/entities/abstract_gizmo.dart

@@ -1,21 +0,0 @@
-import 'package:vector_math/vector_math_64.dart';
-
-import '../../thermion_dart.dart';
-
-abstract class AbstractGizmo {
-  
-  bool get isVisible;
-  bool get isHovered;
-
-  Future translate(double transX, double transY);
-
-  void reset();
-
-  Future attach(ThermionEntity entity);
-
-  Future detach();
-
-  Stream<Aabb2> get boundingBox;
-
-  void checkHover(double x, double y);
-}

thermion_dart/lib/src/input/src/implementations/fixed_orbit_camera_rotation_delegate.dart

@@ -56,6 +56,9 @@ class FixedOrbitRotateInputHandlerDelegate implements InputHandlerDelegate {
       return;
     }
 
+    final view = await viewer.getViewAt(0);
+    final viewport = await view.getViewport();
+
     var viewMatrix = await viewer.getCameraViewMatrix();
     var modelMatrix = await viewer.getCameraModelMatrix();
     var projectionMatrix = await viewer.getCameraProjectionMatrix();
@@ -80,12 +83,8 @@ class FixedOrbitRotateInputHandlerDelegate implements InputHandlerDelegate {
         intersectionInClipSpace / intersectionInClipSpace.w;
 
     // Calculate new camera position based on rotation
-    final ndcX = 2 *
+    final ndcX = 2 * ((-_queuedRotationDelta.x) / viewport.width);
-        ((-_queuedRotationDelta.x * viewer.pixelRatio) /
+    final ndcY = 2 * ((_queuedRotationDelta.y) / viewport.height);
-            viewer.viewportDimensions.$1);
-    final ndcY = 2 *
-        ((_queuedRotationDelta.y * viewer.pixelRatio) /
-            viewer.viewportDimensions.$2);
     final ndc = Vector4(ndcX, ndcY, intersectionInNdcSpace.z, 1.0);
 
     var clipSpace = Vector4(

thermion_dart/lib/src/input/src/implementations/free_flight_camera_delegate.dart

@@ -93,9 +93,9 @@ class FreeFlightInputHandlerDelegate implements InputHandlerDelegate {
     // Apply rotation
     if (_queuedRotationDelta.length2 > 0.0) {
       double deltaX =
-          _queuedRotationDelta.x * rotationSensitivity * viewer.pixelRatio;
+          _queuedRotationDelta.x * rotationSensitivity;
       double deltaY =
-          _queuedRotationDelta.y * rotationSensitivity * viewer.pixelRatio;
+          _queuedRotationDelta.y * rotationSensitivity;
 
       Quaternion yawRotation = Quaternion.axisAngle(_up, -deltaX);
       Quaternion pitchRotation = Quaternion.axisAngle(_right, -deltaY);
@@ -109,8 +109,8 @@ class FreeFlightInputHandlerDelegate implements InputHandlerDelegate {
       Vector3 right = _right.clone()..applyQuaternion(currentRotation);
       Vector3 up = _up.clone()..applyQuaternion(currentRotation);
 
-      double deltaX = _queuedPanDelta.x * panSensitivity * viewer.pixelRatio;
+      double deltaX = _queuedPanDelta.x * panSensitivity;
-      double deltaY = _queuedPanDelta.y * panSensitivity * viewer.pixelRatio;
+      double deltaY = _queuedPanDelta.y * panSensitivity;
 
       relativeTranslation += right * deltaX + up * deltaY;
       _queuedPanDelta = Vector2.zero();

thermion_dart/lib/src/input/src/implementations/third_person_camera_delegate.dart

@@ -96,9 +96,9 @@ class OverTheShoulderCameraDelegate implements InputHandlerDelegate {
     // camera is always looking at -Z, whereas models generally face towards +Z
     if (_queuedRotationDelta.length2 > 0.0) {
       double deltaX =
-          _queuedRotationDelta.x * rotationSensitivity * viewer.pixelRatio;
+          _queuedRotationDelta.x * rotationSensitivity;
       double deltaY =
-          _queuedRotationDelta.y * rotationSensitivity * viewer.pixelRatio;
+          _queuedRotationDelta.y * rotationSensitivity;
 
       cameraLookAt = Matrix4.rotationY(-deltaX) *
           Matrix4.rotationX(-deltaY) *

thermion_dart/lib/src/utils/gizmo.dart

@@ -1,19 +1,31 @@
 import 'dart:async';
-import 'package:thermion_dart/src/entities/abstract_gizmo.dart';
 
+import 'package:thermion_dart/src/viewer/viewer.dart';
 import 'package:vector_math/vector_math_64.dart';
-import '../viewer/viewer.dart';
 
-class Gizmo extends AbstractGizmo {
+abstract class Gizmo {
+  bool get isVisible;
+  bool get isHovered;
+
+  void reset();
+
+  Future attach(ThermionEntity entity);
+  Future detach();
+
+  Stream<Aabb2> get boundingBox;
+
+  void checkHover(int x, int y);
+}
+
+abstract class BaseGizmo extends Gizmo {
   final ThermionEntity x;
   final ThermionEntity y;
   final ThermionEntity z;
   final ThermionEntity center;
 
-  final ThermionViewer _viewer;
-
   ThermionEntity? _activeAxis;
   ThermionEntity? _activeEntity;
+  ThermionViewer viewer;
 
   bool _visible = false;
   bool get isVisible => _visible;
@@ -26,10 +38,9 @@ class Gizmo extends AbstractGizmo {
   Stream<Aabb2> get boundingBox => _boundingBoxController.stream;
   final _boundingBoxController = StreamController<Aabb2>.broadcast();
 
-  Gizmo(this.x, this.y, this.z, this.center, this._viewer,
+  BaseGizmo({required this.x, required this.y, required this.z, required this.center, required this.viewer,
-      {this.ignore = const <ThermionEntity>{}}) {
+      this.ignore = const <ThermionEntity>{}}) {
-    _viewer.gizmoPickResult.listen(_onGizmoPickResult);
+    onPick(_onGizmoPickResult);
-    _viewer.pickResult.listen(_onPickResult);
   }
 
   final _stopwatch = Stopwatch();
@@ -52,12 +63,10 @@ class Gizmo extends AbstractGizmo {
     final axis = Vector3(_activeAxis == x ? 1.0 : 0.0,
         _activeAxis == y ? 1.0 : 0.0, _activeAxis == z ? 1.0 : 0.0);
 
-    await _viewer.queueRelativePositionUpdateWorldAxis(
+    await viewer.queueRelativePositionUpdateWorldAxis(
         _activeEntity!,
-        _transX * _viewer.pixelRatio,
+        _transX,
-        -_transY *
+        -_transY, // flip the sign because "up" in NDC Y axis is positive, but negative in Flutter
-            _viewer
-                .pixelRatio, // flip the sign because "up" in NDC Y axis is positive, but negative in Flutter
         axis.x,
         axis.y,
         axis.z);
@@ -70,10 +79,6 @@ class Gizmo extends AbstractGizmo {
     _activeAxis = null;
   }
 
-  void _onPickResult(FilamentPickResult result) async {
-    await attach(result.entity);
-  }
-
   void _onGizmoPickResult(FilamentPickResult result) async {
     if (result.entity == x || result.entity == y || result.entity == z) {
       _activeAxis = result.entity;
@@ -98,21 +103,25 @@ class Gizmo extends AbstractGizmo {
     _visible = true;
 
     if (_activeEntity != null) {
-      await _viewer.removeStencilHighlight(_activeEntity!);
+      await viewer.removeStencilHighlight(_activeEntity!);
     }
     _activeEntity = entity;
-    await _viewer.setGizmoVisibility(true);
-    await _viewer.setParent(center, entity, preserveScaling: false);
-    _boundingBoxController.sink.add(await _viewer.getViewportBoundingBox(x));
 
+    await viewer.setParent(center, entity, preserveScaling: false);
+    _boundingBoxController.sink.add(await viewer.getViewportBoundingBox(x));
   }
 
   Future detach() async {
-    await _viewer.setGizmoVisibility(false);
+    await setVisibility(false);
   }
 
   @override
-  void checkHover(double x, double y) {
+  void checkHover(int x, int y) {
-    _viewer.pickGizmo(x.toInt(), y.toInt());
+    pick(x, y);
   }
+
+  Future pick(int x, int y);
+
+  Future setVisibility(bool visible);
+  void onPick(void Function(PickResult result) callback);
 }

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

@@ -0,0 +1,50 @@
+import 'dart:async';
+import 'dart:ffi';
+
+import 'package:thermion_dart/src/viewer/src/ffi/src/thermion_dart.g.dart';
+
+import '../../../../utils/gizmo.dart';
+import '../../../viewer.dart';
+
+class FFIGizmo extends BaseGizmo {
+  Pointer<TGizmo> pointer;
+
+  late NativeCallable<GizmoPickCallbackFunction> _nativeCallback;
+  FFIGizmo(
+      this.pointer, ThermionViewer viewer) : super(x: 0, y: 0, z: 0, center: 0, viewer: viewer) {
+    _nativeCallback =
+        NativeCallable<GizmoPickCallbackFunction>.listener(_onPickResult);
+  }
+
+  ///
+  /// The result(s) of calling [pickGizmo] (see below).
+  ///
+  // Stream<PickResult> get onPick => _pickResultController.stream;
+  // final _pickResultController = StreamController<PickResult>.broadcast();
+
+  void Function(PickResult)? _callback;
+
+  void onPick(void Function(PickResult) callback) {
+    _callback = callback;
+  }
+
+  void _onPickResult(DartEntityId entityId, int x, int y, Pointer<TView> view) {
+    _callback?.call((entity: entityId, x: x, y: 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).
+  ///
+  @override
+  Future pick(int x, int y) async {
+    Gizmo_pick(pointer, x.toInt(), y, _nativeCallback.nativeFunction);
+  }
+
+  @override
+  Future setVisibility(bool visible) async {
+    Gizmo_setVisibility(pointer, visible);
+  }
+}

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

@@ -0,0 +1,42 @@
+import 'dart:ffi';
+
+import 'package:thermion_dart/src/viewer/src/ffi/src/thermion_dart.g.dart';
+import 'package:thermion_dart/src/viewer/src/shared_types/camera.dart';
+
+import '../../shared_types/view.dart';
+import '../thermion_viewer_ffi.dart';
+import 'thermion_viewer_ffi.dart';
+
+class FFIView extends View {
+  final Pointer<TView> view;
+  final Pointer<TViewer> viewer;
+
+  FFIView(this.view, this.viewer);
+
+  @override
+  Future updateViewport(int width, int height) async {
+    View_updateViewport(view, width, height);
+  }
+
+  @override
+  Future setRenderTarget(covariant FFIRenderTarget renderTarget) async {
+    View_setRenderTarget(view, renderTarget.renderTarget);
+  }
+
+  @override
+  Future setCamera(FFICamera camera) async {
+    View_setCamera(view, camera.camera);
+  }
+
+  @override
+  Future<Viewport> getViewport() async {
+    TViewport vp = View_getViewport(view);
+    return Viewport(vp.left, vp.bottom, vp.width, vp.height);
+  }
+
+  @override
+  Camera getCamera() {
+    final engine = Viewer_getEngine(viewer);
+    return FFICamera(View_getCamera(view), engine);
+  }
+}

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

@@ -139,6 +139,13 @@ external void Viewer_setMainCamera(
   ffi.Pointer<TView> tView,
 );
 
+@ffi.Native<ffi.Pointer<TSwapChain> Function(ffi.Pointer<TViewer>, ffi.Int)>(
+    isLeaf: true)
+external ffi.Pointer<TSwapChain> Viewer_getSwapChainAt(
+  ffi.Pointer<TViewer> tViewer,
+  int index,
+);
+
 @ffi.Native<ffi.Pointer<TEngine> Function(ffi.Pointer<TViewer>)>(isLeaf: true)
 external ffi.Pointer<TEngine> Viewer_getEngine(
   ffi.Pointer<TViewer> viewer,
@@ -662,9 +669,9 @@ external void SceneManager_setVisibilityLayer(
   int layer,
 );
 
-@ffi.Native<ffi.Pointer<TGizmo> Function(ffi.Pointer<TSceneManager>)>(
+@ffi.Native<ffi.Pointer<TScene> Function(ffi.Pointer<TSceneManager>)>(
     isLeaf: true)
-external ffi.Pointer<TGizmo> SceneManager_getGizmo(
+external ffi.Pointer<TScene> SceneManager_getScene(
   ffi.Pointer<TSceneManager> tSceneManager,
 );
 
@@ -1176,14 +1183,6 @@ external void set_priority(
   int priority,
 );
 
-@ffi.Native<
-    ffi.Void Function(
-        ffi.Pointer<TSceneManager>, ffi.Pointer<EntityId>)>(isLeaf: true)
-external void get_gizmo(
-  ffi.Pointer<TSceneManager> sceneManager,
-  ffi.Pointer<EntityId> out,
-);
-
 @ffi.Native<
     Aabb2 Function(
         ffi.Pointer<TSceneManager>, ffi.Pointer<TView>, EntityId)>(isLeaf: true)
@@ -1212,13 +1211,6 @@ external void get_bounding_box_to_out(
   ffi.Pointer<ffi.Float> maxY,
 );
 
-@ffi.Native<ffi.Void Function(ffi.Pointer<TSceneManager>, ffi.Bool)>(
-    isLeaf: true)
-external void set_gizmo_visibility(
-  ffi.Pointer<TSceneManager> sceneManager,
-  bool visible,
-);
-
 @ffi.Native<
     ffi.Void Function(ffi.Pointer<TSceneManager>, EntityId, ffi.Float,
         ffi.Float, ffi.Float)>(isLeaf: true)
@@ -1480,10 +1472,15 @@ external void set_rendering_render_thread(
 );
 
 @ffi.Native<
-    ffi.Void Function(ffi.Pointer<TViewer>,
+    ffi.Void Function(
+        ffi.Pointer<TViewer>,
+        ffi.Pointer<TView>,
+        ffi.Pointer<TSwapChain>,
         ffi.Pointer<ffi.NativeFunction<ffi.Void Function()>>)>(isLeaf: true)
-external void request_frame_render_thread(
+external void Viewer_requestFrameRenderThread(
   ffi.Pointer<TViewer> viewer,
+  ffi.Pointer<TView> view,
+  ffi.Pointer<TSwapChain> tSwapChain,
   ffi.Pointer<ffi.NativeFunction<ffi.Void Function()>> onComplete,
 );
 
@@ -1892,7 +1889,7 @@ external void View_setBloom(
 
 @ffi.Native<
     ffi.Void Function(
-        ffi.Pointer<TView>, ffi.Pointer<TEngine>, ffi.Int)>(isLeaf: true)
+        ffi.Pointer<TView>, ffi.Pointer<TEngine>, ffi.Int32)>(isLeaf: true)
 external void View_setToneMapping(
   ffi.Pointer<TView> tView,
   ffi.Pointer<TEngine> tEngine,
@@ -1924,30 +1921,39 @@ external void View_setCamera(
   ffi.Pointer<TCamera> tCamera,
 );
 
+@ffi.Native<ffi.Pointer<TScene> Function(ffi.Pointer<TView>)>(isLeaf: true)
+external ffi.Pointer<TScene> View_getScene(
+  ffi.Pointer<TView> tView,
+);
+
 @ffi.Native<ffi.Pointer<TCamera> Function(ffi.Pointer<TView>)>(isLeaf: true)
 external ffi.Pointer<TCamera> View_getCamera(
   ffi.Pointer<TView> tView,
 );
 
 @ffi.Native<
-    ffi.Void Function(
+    ffi.Pointer<TGizmo> Function(ffi.Pointer<TEngine>, ffi.Pointer<TView>,
-        ffi.Pointer<TGizmo>,
+        ffi.Pointer<TScene>)>(isLeaf: true)
-        ffi.Pointer<TView>,
+external ffi.Pointer<TGizmo> Gizmo_new(
-        ffi.Int,
+  ffi.Pointer<TEngine> tEngine,
-        ffi.Int,
+  ffi.Pointer<TView> tView,
-        ffi.Pointer<
+  ffi.Pointer<TScene> tScene,
-            ffi.NativeFunction<
+);
-                ffi.Void Function(
+
-                    EntityId entityId, ffi.Int x, ffi.Int y)>>)>(isLeaf: true)
+@ffi.Native<
+    ffi.Void Function(ffi.Pointer<TGizmo>, ffi.Uint32, ffi.Uint32,
+        GizmoPickCallback)>(isLeaf: true)
 external void Gizmo_pick(
   ffi.Pointer<TGizmo> tGizmo,
-  ffi.Pointer<TView> tView,
   int x,
   int y,
-  ffi.Pointer<
+  GizmoPickCallback callback,
-          ffi.NativeFunction<
+);
-              ffi.Void Function(EntityId entityId, ffi.Int x, ffi.Int y)>>
+
-      callback,
+@ffi.Native<ffi.Void Function(ffi.Pointer<TGizmo>, ffi.Bool)>(isLeaf: true)
+external void Gizmo_setVisibility(
+  ffi.Pointer<TGizmo> tGizmo,
+  bool visible,
 );
 
 final class TCamera extends ffi.Opaque {}
@@ -1970,6 +1976,8 @@ final class TView extends ffi.Opaque {}
 
 final class TGizmo extends ffi.Opaque {}
 
+final class TScene extends ffi.Opaque {}
+
 final class TMaterialKey extends ffi.Struct {
   @ffi.Bool()
   external bool doubleSided;
@@ -2216,6 +2224,19 @@ final class TViewport extends ffi.Struct {
   external int height;
 }
 
+abstract class ToneMapping {
+  static const int ACES = 0;
+  static const int FILMIC = 1;
+  static const int LINEAR = 2;
+}
+
+typedef GizmoPickCallback
+    = ffi.Pointer<ffi.NativeFunction<GizmoPickCallbackFunction>>;
+typedef GizmoPickCallbackFunction = ffi.Void Function(
+    EntityId entityId, ffi.Uint32 x, ffi.Uint32 y, ffi.Pointer<TView> view);
+typedef DartGizmoPickCallbackFunction = void Function(
+    DartEntityId entityId, int x, int y, ffi.Pointer<TView> view);
+
 const int __bool_true_false_are_defined = 1;
 
 const int true1 = 1;

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

@@ -1,22 +1,20 @@
 import 'dart:async';
-import 'dart:ffi';
 import 'dart:math';
 import 'dart:typed_data';
 import 'package:animation_tools_dart/animation_tools_dart.dart';
-import 'package:thermion_dart/src/viewer/src/shared_types/swap_chain.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 '../../../../entities/gizmo.dart';
+import '../../../../utils/gizmo.dart';
 import '../../../../utils/matrix.dart';
 import '../../events.dart';
-import '../../shared_types/camera.dart';
 import '../../shared_types/view.dart';
 import '../../thermion_viewer_base.dart';
 import 'package:logging/logging.dart';
 
 import 'callbacks.dart';
 import 'camera_ffi.dart';
-import 'thermion_dart.g.dart';
+import 'ffi_view.dart';
 
 // ignore: constant_identifier_names
 const ThermionEntity _FILAMENT_ASSET_ERROR = 0;
@@ -26,8 +24,6 @@ typedef RenderCallback = Pointer<NativeFunction<Void Function(Pointer<Void>)>>;
 class ThermionViewerFFI extends ThermionViewer {
   final _logger = Logger("ThermionViewerFFI");
 
-  double pixelRatio = 1.0;
-
   Pointer<TSceneManager>? _sceneManager;
 
   Pointer<TViewer>? _viewer;
@@ -87,13 +83,9 @@ class ThermionViewerFFI extends ThermionViewer {
     this._driver = driver ?? nullptr;
     this._sharedContext = sharedContext ?? nullptr;
 
-    _onPickResultCallable =
+    // _onPickResultCallable =
-        NativeCallable<Void Function(EntityId entityId, Int x, Int y)>.listener(
+    //     NativeCallable<Void Function(EntityId entityId, Int x, Int y)>.listener(
-            _onPickResult);
+    //         _onPickResult);
-
-    _onGizmoPickResultCallable =
-        NativeCallable<Void Function(EntityId entityId, Int x, Int y)>.listener(
-            _onGizmoPickResult);
 
     _initialize();
   }
@@ -131,7 +123,6 @@ class ThermionViewerFFI extends ThermionViewer {
   ///
   ///
   Future updateViewportAndCameraProjection(double width, double height) async {
-    viewportDimensions = (width * pixelRatio, height * pixelRatio);
     var mainView = FFIView(Viewer_getViewAt(_viewer!, 0), _viewer!);
     mainView.updateViewport(width.toInt(), height.toInt());
 
@@ -148,7 +139,7 @@ class ThermionViewerFFI extends ThermionViewer {
         far = kFar;
       }
 
-      var aspect = viewportDimensions.$1 / viewportDimensions.$2;
+      var aspect = width / height;
       var focalLength = await camera.getFocalLength();
       if (focalLength.abs() < 0.1) {
         focalLength = kFocalLength;
@@ -161,8 +152,8 @@ class ThermionViewerFFI extends ThermionViewer {
   Future<SwapChain> createSwapChain(int width, int height,
       {Pointer<Void>? surface}) async {
     var swapChain = await withPointerCallback<TSwapChain>((callback) {
-      return Viewer_createSwapChainRenderThread(_viewer!, surface ?? nullptr,
+      return Viewer_createSwapChainRenderThread(
-          width, height, callback);
+          _viewer!, surface ?? nullptr, width, height, callback);
     });
     return FFISwapChain(swapChain, _viewer!);
   }
@@ -193,11 +184,6 @@ class ThermionViewerFFI extends ThermionViewer {
 
     _sceneManager = Viewer_getSceneManager(_viewer!);
 
-    final gizmoEntities = allocator<Int32>(4);
-    get_gizmo(_sceneManager!, gizmoEntities);
-    _gizmo = Gizmo(gizmoEntities[0], gizmoEntities[1], gizmoEntities[2],
-        gizmoEntities[3], this);
-    allocator.free(gizmoEntities);
     this._initialized.complete(true);
   }
 
@@ -224,8 +210,9 @@ class ThermionViewerFFI extends ThermionViewer {
   ///
   ///
   @override
-  Future render(FFISwapChain swapChain) async {
+  Future render({FFISwapChain? swapChain}) async {
     final view = (await getViewAt(0)) as FFIView;
+    swapChain ??= FFISwapChain(Viewer_getSwapChainAt(_viewer!, 0), _viewer!);
     Viewer_renderRenderThread(_viewer!, view.view, swapChain.swapChain);
   }
 
@@ -233,20 +220,24 @@ class ThermionViewerFFI extends ThermionViewer {
   ///
   ///
   @override
-  Future<Uint8List> capture(FFISwapChain swapChain,
+  Future<Uint8List> capture(
-      {FFIView? view, FFIRenderTarget? renderTarget}) async {
+      {FFIView? view,
-    final length = this.viewportDimensions.$1.toInt() *
+      FFISwapChain? swapChain,
-        this.viewportDimensions.$2.toInt() *
+      FFIRenderTarget? renderTarget}) async {
-        4;
-    final out = Uint8List(length);
     view ??= (await getViewAt(0)) as FFIView;
+    final vp = await view.getViewport();
+    final length = vp.width * vp.height * 4;
+    final out = Uint8List(length);
+
+    swapChain ??= FFISwapChain(Viewer_getSwapChainAt(_viewer!, 0), _viewer!);
+
     await withVoidCallback((cb) {
       if (renderTarget != null) {
         Viewer_captureRenderTargetRenderThread(_viewer!, view!.view,
-            swapChain.swapChain, renderTarget.renderTarget, out.address, cb);
+            swapChain!.swapChain, renderTarget.renderTarget, out.address, cb);
       } else {
         Viewer_captureRenderThread(
-            _viewer!, view!.view, swapChain.swapChain, out.address, cb);
+            _viewer!, view!.view, swapChain!.swapChain, out.address, cb);
       }
     });
     return out;
@@ -1341,20 +1332,6 @@ class ThermionViewerFFI extends ThermionViewer {
     set_camera_model_matrix(mainCamera.camera, out);
   }
 
-  ///
-  ///
-  ///
-  @override
-  Future setCameraLensProjection(
-      {double near = kNear,
-      double far = kFar,
-      double? aspect,
-      double focalLength = kFocalLength}) async {
-    aspect ??= viewportDimensions.$1 / viewportDimensions.$2;
-    var mainCamera = get_camera(_viewer!, get_main_camera(_viewer!));
-    Camera_setLensProjection(mainCamera, near, far, aspect, focalLength);
-  }
-
   ///
   ///
   ///
@@ -1492,50 +1469,31 @@ class ThermionViewerFFI extends ThermionViewer {
     return result.cast<Utf8>().toDartString();
   }
 
-  void _onPickResult(ThermionEntity entityId, int x, int y) {
+  void _onPickResult(
-    _pickResultController.add((
+      ThermionEntity entityId, int x, int y, Pointer<TView> viewPtr) async {
-      entity: entityId,
+    final view = FFIView(viewPtr, _viewer!);
-      x: (x / pixelRatio).toDouble(),
+    final viewport = await view.getViewport();
-      y: (viewportDimensions.$2 - y) / pixelRatio
-    ));
-  }
 
-  void _onGizmoPickResult(ThermionEntity entityId, int x, int y) {
+    // _pickResultController.add((
-    _gizmoPickResultController.add((
+    //   entity: entityId,
-      entity: entityId,
+    //   x: (x / pixelRatio).toDouble(),
-      x: (x / pixelRatio).toDouble(),
+    //   y: (viewport.height - y) / pixelRatio
-      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;
 
   ///
   ///
   ///
   @override
   void pick(int x, int y) async {
-    x = (x * pixelRatio).ceil();
+    // x = (x * pixelRatio).ceil();
-    y = (viewportDimensions.$2 - (y * pixelRatio)).ceil();
+    // y = (viewportDimensions.$2 - (y * pixelRatio)).ceil();
-    final view = (await getViewAt(0)) as FFIView;
+    // final view = (await getViewAt(0)) as FFIView;
-    filament_pick(
+    // filament_pick(
-        _viewer!, view.view, x, y, _onPickResultCallable.nativeFunction);
+    //     _viewer!, view.view, x, y, _onPickResultCallable.nativeFunction);
-  }
-
-  ///
-  ///
-  ///
-  @override
-  void pickGizmo(int x, int y) async {
-    x = (x * pixelRatio).ceil();
-    y = (viewportDimensions.$2 - (y * pixelRatio)).ceil();
-    final view = (await getViewAt(0)) as FFIView;
-    final gizmo = SceneManager_getGizmo(_sceneManager!);
-    Gizmo_pick(
-        gizmo, view.view, x, y, _onGizmoPickResultCallable.nativeFunction);
   }
 
   ///
@@ -1866,13 +1824,6 @@ class ThermionViewerFFI extends ThermionViewer {
     SceneManager_setVisibilityLayer(_sceneManager!, entity, layer);
   }
 
-  ///
-  ///
-  ///
-  Future setGizmoVisibility(bool visible) async {
-    set_gizmo_visibility(_sceneManager!, visible);
-  }
-
   ///
   ///
   ///
@@ -2088,7 +2039,11 @@ class ThermionViewerFFI extends ThermionViewer {
       completer.complete(true);
     });
 
-    request_frame_render_thread(_viewer!, callback.nativeFunction);
+    final swapChain = Viewer_getSwapChainAt(_viewer!, 0);
+    final view = Viewer_getViewAt(_viewer!, 0);
+
+    Viewer_requestFrameRenderThread(
+        _viewer!, view, swapChain, callback.nativeFunction);
 
     await completer.future;
   }
@@ -2164,6 +2119,14 @@ class ThermionViewerFFI extends ThermionViewer {
     }
     return FFIView(view, _viewer!);
   }
+
+  @override
+  Future<Gizmo> createGizmo(FFIView view) async {
+    var view = (await getViewAt(0)) as FFIView;
+    var scene = View_getScene(view.view);
+    final gizmo = Gizmo_new(Viewer_getEngine(_viewer!), view.view, scene);
+    return FFIGizmo(gizmo, this);
+  }
 }
 
 class ThermionFFITexture extends ThermionTexture {
@@ -2218,32 +2181,3 @@ class FFISwapChain extends SwapChain {
     });
   }
 }
-
-class FFIView extends View {
-  final Pointer<TView> view;
-  final Pointer<TViewer> viewer;
-
-  FFIView(this.view, this.viewer);
-
-  @override
-  Future updateViewport(int width, int height) async {
-    View_updateViewport(view, width, height);
-  }
-
-  @override
-  Future setRenderTarget(covariant FFIRenderTarget renderTarget) async {
-    View_setRenderTarget(view, renderTarget.renderTarget);
-  }
-
-  @override
-  Future setCamera(FFICamera camera) async {
-    View_setCamera(view, camera.camera);
-  }
-  
-  @override
-  Future<Viewport> getViewport() async {
-    TViewport vp = View_getViewport(view);
-    return Viewport(vp.left, vp.bottom, vp.width, vp.height);
-  }
-
-}

thermion_dart/lib/src/viewer/src/shared_types/pick_result.dart

@@ -1,5 +1,5 @@
 // "picking" means clicking/tapping on the viewport, and unprojecting the X/Y coordinate to determine whether any renderable entities were present at those coordinates.
 import '../../viewer.dart';
 
-typedef FilamentPickResult = ({ThermionEntity entity, double x, double y});
+typedef FilamentPickResult = ({ThermionEntity entity, int x, int y});
-typedef ThermionPickResult = FilamentPickResult;
+typedef PickResult = FilamentPickResult;

thermion_dart/lib/src/viewer/src/shared_types/view.dart

@@ -12,7 +12,7 @@ class Viewport {
 abstract class View {
   Future<Viewport> getViewport();
   Future updateViewport(int width, int height);
-  Future setRenderTarget(covariant RenderTarget renderTarget);
+  Future setRenderTarget(covariant RenderTarget? renderTarget);
   Future setCamera(covariant Camera camera);
-  
+  Camera getCamera();
 }

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

@@ -1,6 +1,5 @@
 import 'package:thermion_dart/src/viewer/src/events.dart';
-import '../../entities/abstract_gizmo.dart';
+import '../../utils/gizmo.dart';
-import 'shared_types/camera.dart';
 import 'shared_types/shared_types.dart';
 export 'shared_types/shared_types.dart';
 
@@ -10,7 +9,6 @@ import 'package:vector_math/vector_math_64.dart';
 import 'dart:async';
 import 'package:animation_tools_dart/animation_tools_dart.dart';
 
-import 'shared_types/swap_chain.dart';
 import 'shared_types/view.dart';
 
 const double kNear = 0.05;
@@ -23,16 +21,6 @@ abstract class ThermionViewer {
   ///
   Future<bool> get initialized;
 
-  ///
-  /// The current dimensions of the viewport (in physical pixels).
-  ///
-  var viewportDimensions = (0.0, 0.0);
-
-  ///
-  /// The current ratio of logical to physical pixels.
-  ///
-  late double pixelRatio;
-
   ///
   /// The result(s) of calling [pick] (see below).
   /// This may be a broadcast stream, so you should ensure you have subscribed to this stream before calling [pick].
@@ -40,11 +28,6 @@ abstract class ThermionViewer {
   ///
   Stream<FilamentPickResult> get pickResult;
 
-  ///
-  /// The result(s) of calling [pickGizmo] (see below).
-  ///
-  Stream<FilamentPickResult> get gizmoPickResult;
-
   ///
   /// A Stream containing entities added/removed to/from to the scene.
   ///
@@ -63,7 +46,7 @@ abstract class ThermionViewer {
   ///
   /// Render a single frame immediately.
   ///
-  Future render(covariant SwapChain swapChain);
+  Future render({covariant SwapChain? swapChain});
 
   ///
   /// Requests a single frame to be rendered. This is only intended to be used internally.
@@ -73,8 +56,8 @@ abstract class ThermionViewer {
   ///
   /// Render a single frame and copy the pixel buffer to [out].
   ///
-  Future<Uint8List> capture(covariant SwapChain swapChain,
+  Future<Uint8List> capture({covariant SwapChain? swapChain,
-      {covariant View? view, covariant RenderTarget? renderTarget});
+      covariant View? view, covariant RenderTarget? renderTarget});
 
   ///
   ///
@@ -96,7 +79,7 @@ abstract class ThermionViewer {
   ///
   ///
   Future<View> createView();
-  
+
   ///
   ///
   ///
@@ -400,7 +383,6 @@ abstract class ThermionViewer {
   ///
   Future clearEntities();
 
-
   ///
   /// Schedules the glTF animation at [index] in [entity] to start playing on the next frame.
   ///
@@ -493,15 +475,6 @@ abstract class ThermionViewer {
   ///
   Future<double> getCameraCullingFar();
 
-  ///
-  ///
-  ///
-  Future setCameraLensProjection(
-      {double near = kNear,
-      double far = kFar,
-      double? aspect,
-      double focalLength = kFocalLength});
-
   ///
   /// Sets the focus distance for the camera.
   ///
@@ -701,14 +674,6 @@ 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).
   ///
@@ -793,9 +758,9 @@ abstract class ThermionViewer {
   Future setPriority(ThermionEntity entityId, int priority);
 
   ///
-  /// The gizmo for translating/rotating objects. Only one gizmo is present in the scene.
+  /// The gizmo for translating/rotating objects. Only one gizmo can be active for a given view.
   ///
-  AbstractGizmo? get gizmo;
+  Future<Gizmo> createGizmo(covariant View view);
 
   ///
   /// Register a callback to be invoked when this viewer is disposed.
@@ -819,11 +784,6 @@ abstract class ThermionViewer {
   ///
   Future setVisibilityLayer(ThermionEntity entity, int layer);
 
-  ///
-  /// Show/hide the translation gizmo.
-  ///
-  Future setGizmoVisibility(bool visible);
-
   ///
   /// Renders an outline around [entity] with the given color.
   ///

thermion_dart/lib/src/viewer/src/thermion_viewer_stub.dart

@@ -1,14 +1,13 @@
 import 'dart:math';
 import 'dart:typed_data';
 
+import 'package:thermion_dart/src/utils/gizmo.dart';
 import 'package:thermion_dart/src/viewer/src/shared_types/swap_chain.dart';
 import 'package:thermion_dart/src/viewer/src/shared_types/view.dart';
 import 'package:thermion_dart/thermion_dart.dart';
 import 'package:vector_math/vector_math_64.dart';
 import 'dart:async';
 import 'package:animation_tools_dart/animation_tools_dart.dart';
-
-import '../../entities/abstract_gizmo.dart';
 import 'events.dart';
 import 'shared_types/camera.dart';
 
@@ -242,10 +241,6 @@ class ThermionViewerStub extends ThermionViewer {
     throw UnimplementedError();
   }
 
-  @override
-  // TODO: implement gizmo
-  AbstractGizmo? get gizmo => throw UnimplementedError();
-
   @override
   Future hide(ThermionEntity entity, String? meshName) {
     // TODO: implement hide
@@ -1028,12 +1023,6 @@ class ThermionViewerStub extends ThermionViewer {
     // TODO: implement setRenderTarget
     throw UnimplementedError();
   }
-  
-  @override
-  Future<Uint8List> capture(covariant SwapChain swapChain, {covariant RenderTarget? renderTarget}) {
-    // TODO: implement capture
-    throw UnimplementedError();
-  }
 
   @override
   Future<View> createView() {
@@ -1052,6 +1041,18 @@ class ThermionViewerStub extends ThermionViewer {
     // TODO: implement render
     throw UnimplementedError();
   }
+  
+  @override
+  Future<Uint8List> capture(covariant SwapChain swapChain, {covariant View? view, covariant RenderTarget? renderTarget}) {
+    // TODO: implement capture
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<Gizmo> createGizmo(covariant View view) {
+    // TODO: implement createGizmo
+    throw UnimplementedError();
+  }
 
   
 }

thermion_dart/lib/src/viewer/src/web_js/src/thermion_viewer_js.dart

@@ -6,7 +6,7 @@ import 'dart:typed_data';
 import 'package:animation_tools_dart/animation_tools_dart.dart';
 import 'package:logging/logging.dart';
 import 'package:vector_math/vector_math_64.dart';
-import '../../../../entities/abstract_gizmo.dart';
+import '../../shared_types/internal/gizmo.dart';
 import '../../../viewer.dart';
 import '../../events.dart';
 import '../../shared_types/camera.dart';

thermion_dart/lib/src/viewer/src/web_wasm/src/camera.dart

@@ -45,4 +45,28 @@ class ThermionWasmCamera extends Camera {
     // TODO: implement setModelMatrix
     throw UnimplementedError();
   }
+  
+  @override
+  Future<double> getCullingFar() {
+    // TODO: implement getCullingFar
+    throw UnimplementedError();
+  }
+  
+  @override
+  Future<double> getFocalLength() {
+    // TODO: implement getFocalLength
+    throw UnimplementedError();
+  }
+  
+  @override
+  Future<double> getNear() {
+    // TODO: implement getNear
+    throw UnimplementedError();
+  }
+  
+  @override
+  Future<Matrix4> getViewMatrix() {
+    // TODO: implement getViewMatrix
+    throw UnimplementedError();
+  }
 }

thermion_dart/lib/src/viewer/src/web_wasm/src/thermion_viewer_wasm.dart

@@ -11,8 +11,8 @@ import 'package:animation_tools_dart/animation_tools_dart.dart';
 import 'package:vector_math/vector_math_64.dart';
 import 'package:http/http.dart' as http;
 import 'dart:convert';
-import '../../../../entities/abstract_gizmo.dart';
+import '../../shared_types/internal/gizmo.dart';
-import '../../../../entities/gizmo.dart';
+import '../../shared_types/internal/gizmo.dart';
 import '../../../viewer.dart';
 import '../../events.dart';
 import '../../shared_types/camera.dart';

thermion_dart/native/include/FilamentViewer.hpp

@@ -132,6 +132,14 @@ namespace thermion
             return (SceneManager *const)_sceneManager;
         }
 
+        SwapChain* getSwapChainAt(int index) {
+            if(index < _swapChains.size()) {
+                return _swapChains[index];
+            }
+            Log("Error: index %d is greater than available swapchains", index);
+            return nullptr;
+        }
+
         void unprojectTexture(EntityId entity, uint8_t* input, uint32_t inputWidth, uint32_t inputHeight, uint8_t* out, uint32_t outWidth, uint32_t outHeight);  
 
     private:

thermion_dart/native/include/ThermionDartApi.h

@@ -85,6 +85,7 @@ extern "C"
 	EMSCRIPTEN_KEEPALIVE TView* Viewer_createView(TViewer *viewer);
 	EMSCRIPTEN_KEEPALIVE TView* Viewer_getViewAt(TViewer *viewer, int index);
 	EMSCRIPTEN_KEEPALIVE void Viewer_setMainCamera(TViewer *tViewer, TView *tView);	
+	EMSCRIPTEN_KEEPALIVE TSwapChain* Viewer_getSwapChainAt(TViewer *tViewer, int index);	
 	
 	// Engine
 	EMSCRIPTEN_KEEPALIVE TEngine *Viewer_getEngine(TViewer* viewer);

thermion_dart/native/include/ThermionDartRenderThreadApi.h

@@ -35,7 +35,7 @@ extern "C"
     
     EMSCRIPTEN_KEEPALIVE FilamentRenderCallback make_render_callback_fn_pointer(FilamentRenderCallback);
     EMSCRIPTEN_KEEPALIVE void set_rendering_render_thread(TViewer *viewer, bool rendering, void(*onComplete)());
-    EMSCRIPTEN_KEEPALIVE void request_frame_render_thread(TViewer *viewer, void(*onComplete)());
+    EMSCRIPTEN_KEEPALIVE void Viewer_requestFrameRenderThread(TViewer *viewer, TView *view, TSwapChain *tSwapChain, void(*onComplete)());
     EMSCRIPTEN_KEEPALIVE void set_frame_interval_render_thread(TViewer *viewer, float frameInterval);
     EMSCRIPTEN_KEEPALIVE void set_background_color_render_thread(TViewer *viewer, const float r, const float g, const float b, const float a);
     EMSCRIPTEN_KEEPALIVE void clear_background_image_render_thread(TViewer *viewer);

thermion_dart/native/include/generated/ThermionTextureSwiftObjCAPI.h

@@ -0,0 +1,325 @@
+// Generated by Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
+#ifndef SWIFT_MODULE_SWIFT_H
+#define SWIFT_MODULE_SWIFT_H
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wgcc-compat"
+
+#if !defined(__has_include)
+# define __has_include(x) 0
+#endif
+#if !defined(__has_attribute)
+# define __has_attribute(x) 0
+#endif
+#if !defined(__has_feature)
+# define __has_feature(x) 0
+#endif
+#if !defined(__has_warning)
+# define __has_warning(x) 0
+#endif
+
+#if __has_include(<swift/objc-prologue.h>)
+# include <swift/objc-prologue.h>
+#endif
+
+#pragma clang diagnostic ignored "-Wauto-import"
+#if defined(__OBJC__)
+#include <Foundation/Foundation.h>
+#endif
+#if defined(__cplusplus)
+#include <cstdint>
+#include <cstddef>
+#include <cstdbool>
+#include <cstring>
+#include <stdlib.h>
+#include <new>
+#include <type_traits>
+#else
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include <string.h>
+#endif
+#if defined(__cplusplus)
+#if defined(__arm64e__) && __has_include(<ptrauth.h>)
+# include <ptrauth.h>
+#else
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wreserved-macro-identifier"
+# ifndef __ptrauth_swift_value_witness_function_pointer
+#  define __ptrauth_swift_value_witness_function_pointer(x)
+# endif
+# ifndef __ptrauth_swift_class_method_pointer
+#  define __ptrauth_swift_class_method_pointer(x)
+# endif
+#pragma clang diagnostic pop
+#endif
+#endif
+
+#if !defined(SWIFT_TYPEDEFS)
+# define SWIFT_TYPEDEFS 1
+# if __has_include(<uchar.h>)
+#  include <uchar.h>
+# elif !defined(__cplusplus)
+typedef uint_least16_t char16_t;
+typedef uint_least32_t char32_t;
+# endif
+typedef float swift_float2  __attribute__((__ext_vector_type__(2)));
+typedef float swift_float3  __attribute__((__ext_vector_type__(3)));
+typedef float swift_float4  __attribute__((__ext_vector_type__(4)));
+typedef double swift_double2  __attribute__((__ext_vector_type__(2)));
+typedef double swift_double3  __attribute__((__ext_vector_type__(3)));
+typedef double swift_double4  __attribute__((__ext_vector_type__(4)));
+typedef int swift_int2  __attribute__((__ext_vector_type__(2)));
+typedef int swift_int3  __attribute__((__ext_vector_type__(3)));
+typedef int swift_int4  __attribute__((__ext_vector_type__(4)));
+typedef unsigned int swift_uint2  __attribute__((__ext_vector_type__(2)));
+typedef unsigned int swift_uint3  __attribute__((__ext_vector_type__(3)));
+typedef unsigned int swift_uint4  __attribute__((__ext_vector_type__(4)));
+#endif
+
+#if !defined(SWIFT_PASTE)
+# define SWIFT_PASTE_HELPER(x, y) x##y
+# define SWIFT_PASTE(x, y) SWIFT_PASTE_HELPER(x, y)
+#endif
+#if !defined(SWIFT_METATYPE)
+# define SWIFT_METATYPE(X) Class
+#endif
+#if !defined(SWIFT_CLASS_PROPERTY)
+# if __has_feature(objc_class_property)
+#  define SWIFT_CLASS_PROPERTY(...) __VA_ARGS__
+# else
+#  define SWIFT_CLASS_PROPERTY(...) 
+# endif
+#endif
+#if !defined(SWIFT_RUNTIME_NAME)
+# if __has_attribute(objc_runtime_name)
+#  define SWIFT_RUNTIME_NAME(X) __attribute__((objc_runtime_name(X)))
+# else
+#  define SWIFT_RUNTIME_NAME(X) 
+# endif
+#endif
+#if !defined(SWIFT_COMPILE_NAME)
+# if __has_attribute(swift_name)
+#  define SWIFT_COMPILE_NAME(X) __attribute__((swift_name(X)))
+# else
+#  define SWIFT_COMPILE_NAME(X) 
+# endif
+#endif
+#if !defined(SWIFT_METHOD_FAMILY)
+# if __has_attribute(objc_method_family)
+#  define SWIFT_METHOD_FAMILY(X) __attribute__((objc_method_family(X)))
+# else
+#  define SWIFT_METHOD_FAMILY(X) 
+# endif
+#endif
+#if !defined(SWIFT_NOESCAPE)
+# if __has_attribute(noescape)
+#  define SWIFT_NOESCAPE __attribute__((noescape))
+# else
+#  define SWIFT_NOESCAPE 
+# endif
+#endif
+#if !defined(SWIFT_RELEASES_ARGUMENT)
+# if __has_attribute(ns_consumed)
+#  define SWIFT_RELEASES_ARGUMENT __attribute__((ns_consumed))
+# else
+#  define SWIFT_RELEASES_ARGUMENT 
+# endif
+#endif
+#if !defined(SWIFT_WARN_UNUSED_RESULT)
+# if __has_attribute(warn_unused_result)
+#  define SWIFT_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
+# else
+#  define SWIFT_WARN_UNUSED_RESULT 
+# endif
+#endif
+#if !defined(SWIFT_NORETURN)
+# if __has_attribute(noreturn)
+#  define SWIFT_NORETURN __attribute__((noreturn))
+# else
+#  define SWIFT_NORETURN 
+# endif
+#endif
+#if !defined(SWIFT_CLASS_EXTRA)
+# define SWIFT_CLASS_EXTRA 
+#endif
+#if !defined(SWIFT_PROTOCOL_EXTRA)
+# define SWIFT_PROTOCOL_EXTRA 
+#endif
+#if !defined(SWIFT_ENUM_EXTRA)
+# define SWIFT_ENUM_EXTRA 
+#endif
+#if !defined(SWIFT_CLASS)
+# if __has_attribute(objc_subclassing_restricted)
+#  define SWIFT_CLASS(SWIFT_NAME) SWIFT_RUNTIME_NAME(SWIFT_NAME) __attribute__((objc_subclassing_restricted)) SWIFT_CLASS_EXTRA
+#  define SWIFT_CLASS_NAMED(SWIFT_NAME) __attribute__((objc_subclassing_restricted)) SWIFT_COMPILE_NAME(SWIFT_NAME) SWIFT_CLASS_EXTRA
+# else
+#  define SWIFT_CLASS(SWIFT_NAME) SWIFT_RUNTIME_NAME(SWIFT_NAME) SWIFT_CLASS_EXTRA
+#  define SWIFT_CLASS_NAMED(SWIFT_NAME) SWIFT_COMPILE_NAME(SWIFT_NAME) SWIFT_CLASS_EXTRA
+# endif
+#endif
+#if !defined(SWIFT_RESILIENT_CLASS)
+# if __has_attribute(objc_class_stub)
+#  define SWIFT_RESILIENT_CLASS(SWIFT_NAME) SWIFT_CLASS(SWIFT_NAME) __attribute__((objc_class_stub))
+#  define SWIFT_RESILIENT_CLASS_NAMED(SWIFT_NAME) __attribute__((objc_class_stub)) SWIFT_CLASS_NAMED(SWIFT_NAME)
+# else
+#  define SWIFT_RESILIENT_CLASS(SWIFT_NAME) SWIFT_CLASS(SWIFT_NAME)
+#  define SWIFT_RESILIENT_CLASS_NAMED(SWIFT_NAME) SWIFT_CLASS_NAMED(SWIFT_NAME)
+# endif
+#endif
+#if !defined(SWIFT_PROTOCOL)
+# define SWIFT_PROTOCOL(SWIFT_NAME) SWIFT_RUNTIME_NAME(SWIFT_NAME) SWIFT_PROTOCOL_EXTRA
+# define SWIFT_PROTOCOL_NAMED(SWIFT_NAME) SWIFT_COMPILE_NAME(SWIFT_NAME) SWIFT_PROTOCOL_EXTRA
+#endif
+#if !defined(SWIFT_EXTENSION)
+# define SWIFT_EXTENSION(M) SWIFT_PASTE(M##_Swift_, __LINE__)
+#endif
+#if !defined(OBJC_DESIGNATED_INITIALIZER)
+# if __has_attribute(objc_designated_initializer)
+#  define OBJC_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+# else
+#  define OBJC_DESIGNATED_INITIALIZER 
+# endif
+#endif
+#if !defined(SWIFT_ENUM_ATTR)
+# if __has_attribute(enum_extensibility)
+#  define SWIFT_ENUM_ATTR(_extensibility) __attribute__((enum_extensibility(_extensibility)))
+# else
+#  define SWIFT_ENUM_ATTR(_extensibility) 
+# endif
+#endif
+#if !defined(SWIFT_ENUM)
+# define SWIFT_ENUM(_type, _name, _extensibility) enum _name : _type _name; enum SWIFT_ENUM_ATTR(_extensibility) SWIFT_ENUM_EXTRA _name : _type
+# if __has_feature(generalized_swift_name)
+#  define SWIFT_ENUM_NAMED(_type, _name, SWIFT_NAME, _extensibility) enum _name : _type _name SWIFT_COMPILE_NAME(SWIFT_NAME); enum SWIFT_COMPILE_NAME(SWIFT_NAME) SWIFT_ENUM_ATTR(_extensibility) SWIFT_ENUM_EXTRA _name : _type
+# else
+#  define SWIFT_ENUM_NAMED(_type, _name, SWIFT_NAME, _extensibility) SWIFT_ENUM(_type, _name, _extensibility)
+# endif
+#endif
+#if !defined(SWIFT_UNAVAILABLE)
+# define SWIFT_UNAVAILABLE __attribute__((unavailable))
+#endif
+#if !defined(SWIFT_UNAVAILABLE_MSG)
+# define SWIFT_UNAVAILABLE_MSG(msg) __attribute__((unavailable(msg)))
+#endif
+#if !defined(SWIFT_AVAILABILITY)
+# define SWIFT_AVAILABILITY(plat, ...) __attribute__((availability(plat, __VA_ARGS__)))
+#endif
+#if !defined(SWIFT_WEAK_IMPORT)
+# define SWIFT_WEAK_IMPORT __attribute__((weak_import))
+#endif
+#if !defined(SWIFT_DEPRECATED)
+# define SWIFT_DEPRECATED __attribute__((deprecated))
+#endif
+#if !defined(SWIFT_DEPRECATED_MSG)
+# define SWIFT_DEPRECATED_MSG(...) __attribute__((deprecated(__VA_ARGS__)))
+#endif
+#if !defined(SWIFT_DEPRECATED_OBJC)
+# if __has_feature(attribute_diagnose_if_objc)
+#  define SWIFT_DEPRECATED_OBJC(Msg) __attribute__((diagnose_if(1, Msg, "warning")))
+# else
+#  define SWIFT_DEPRECATED_OBJC(Msg) SWIFT_DEPRECATED_MSG(Msg)
+# endif
+#endif
+#if defined(__OBJC__)
+#if !defined(IBSegueAction)
+# define IBSegueAction 
+#endif
+#endif
+#if !defined(SWIFT_EXTERN)
+# if defined(__cplusplus)
+#  define SWIFT_EXTERN extern "C"
+# else
+#  define SWIFT_EXTERN extern
+# endif
+#endif
+#if !defined(SWIFT_CALL)
+# define SWIFT_CALL __attribute__((swiftcall))
+#endif
+#if !defined(SWIFT_INDIRECT_RESULT)
+# define SWIFT_INDIRECT_RESULT __attribute__((swift_indirect_result))
+#endif
+#if !defined(SWIFT_CONTEXT)
+# define SWIFT_CONTEXT __attribute__((swift_context))
+#endif
+#if !defined(SWIFT_ERROR_RESULT)
+# define SWIFT_ERROR_RESULT __attribute__((swift_error_result))
+#endif
+#if defined(__cplusplus)
+# define SWIFT_NOEXCEPT noexcept
+#else
+# define SWIFT_NOEXCEPT 
+#endif
+#if !defined(SWIFT_C_INLINE_THUNK)
+# if __has_attribute(always_inline)
+# if __has_attribute(nodebug)
+#  define SWIFT_C_INLINE_THUNK inline __attribute__((always_inline)) __attribute__((nodebug))
+# else
+#  define SWIFT_C_INLINE_THUNK inline __attribute__((always_inline))
+# endif
+# else
+#  define SWIFT_C_INLINE_THUNK inline
+# endif
+#endif
+#if defined(_WIN32)
+#if !defined(SWIFT_IMPORT_STDLIB_SYMBOL)
+# define SWIFT_IMPORT_STDLIB_SYMBOL __declspec(dllimport)
+#endif
+#else
+#if !defined(SWIFT_IMPORT_STDLIB_SYMBOL)
+# define SWIFT_IMPORT_STDLIB_SYMBOL 
+#endif
+#endif
+#if defined(__OBJC__)
+#if __has_feature(objc_modules)
+#if __has_warning("-Watimport-in-framework-header")
+#pragma clang diagnostic ignored "-Watimport-in-framework-header"
+#endif
+@import CoreVideo;
+@import ObjectiveC;
+#endif
+
+#endif
+#pragma clang diagnostic ignored "-Wproperty-attribute-mismatch"
+#pragma clang diagnostic ignored "-Wduplicate-method-arg"
+#if __has_warning("-Wpragma-clang-attribute")
+# pragma clang diagnostic ignored "-Wpragma-clang-attribute"
+#endif
+#pragma clang diagnostic ignored "-Wunknown-pragmas"
+#pragma clang diagnostic ignored "-Wnullability"
+#pragma clang diagnostic ignored "-Wdollar-in-identifier-extension"
+
+#if __has_attribute(external_source_symbol)
+# pragma push_macro("any")
+# undef any
+# pragma clang attribute push(__attribute__((external_source_symbol(language="Swift", defined_in="swift_module",generated_declaration))), apply_to=any(function,enum,objc_interface,objc_category,objc_protocol))
+# pragma pop_macro("any")
+#endif
+
+#if defined(__OBJC__)
+@protocol MTLDevice;
+@protocol MTLTexture;
+@class NSData;
+
+SWIFT_CLASS("_TtC12swift_module20ThermionTextureSwift")
+@interface ThermionTextureSwift : NSObject
+@property (nonatomic) CVMetalTextureCacheRef _Nullable cvMetalTextureCache;
+@property (nonatomic, strong) id <MTLDevice> _Nullable metalDevice;
+@property (nonatomic) CVMetalTextureRef _Nullable cvMetalTexture;
+@property (nonatomic, strong) id <MTLTexture> _Nullable metalTexture;
+@property (nonatomic) NSInteger metalTextureAddress;
+- (nonnull instancetype)init OBJC_DESIGNATED_INITIALIZER;
+- (nonnull instancetype)initWithWidth:(int64_t)width height:(int64_t)height OBJC_DESIGNATED_INITIALIZER;
+- (void)destroyTexture;
+- (void)fillColor;
+- (NSData * _Nullable)getTextureBytes SWIFT_WARN_UNUSED_RESULT;
+@end
+
+#endif
+#if __has_attribute(external_source_symbol)
+# pragma clang attribute pop
+#endif
+#if defined(__cplusplus)
+#endif
+#pragma clang diagnostic pop
+#endif

thermion_dart/native/src/TView.cpp

@@ -3,6 +3,7 @@
 #include <filament/Engine.h>
 #include <filament/ToneMapper.h>
 #include <filament/ColorGrading.h>
+#include <filament/Camera.h>
 
 #include "ThermionDartApi.h"
 #include "TView.h"
@@ -150,6 +151,11 @@ using namespace filament;
         return reinterpret_cast<TScene*>(view->getScene());
     }
 
+    EMSCRIPTEN_KEEPALIVE TCamera* View_getCamera(TView *tView) {
+        auto view = reinterpret_cast<View *>(tView);
+        return reinterpret_cast<TCamera*>(&(view->getCamera()));
+    }
+
 
 #ifdef __cplusplus
 }

thermion_dart/native/src/ThermionDartApi.cpp

@@ -348,8 +348,13 @@ extern "C"
         void (*callback)(void *buf, size_t size, void *data),
         void *data)
     {
-        auto swapChain = reinterpret_cast<SwapChain *>(tSwapChain);
         auto viewer = reinterpret_cast<FilamentViewer *>(tViewer);
+        auto swapChain = reinterpret_cast<SwapChain *>(tSwapChain);
+
+        if(!swapChain) {
+            swapChain = viewer->getSwapChainAt(0);
+        }
+        
         auto *view = reinterpret_cast<View*>(tView);
         return viewer->render(frameTimeInNanos, view, swapChain, pixelBuffer, callback, data);
     }
@@ -413,6 +418,12 @@ extern "C"
         return reinterpret_cast<TSwapChain *>(swapChain);
     }
 
+    EMSCRIPTEN_KEEPALIVE TSwapChain* Viewer_getSwapChainAt(TViewer *tViewer, int index) { 
+        auto viewer = reinterpret_cast<FilamentViewer *>(tViewer);
+        auto swapChain = viewer->getSwapChainAt(index);
+        return reinterpret_cast<TSwapChain *>(swapChain);
+    }
+
     EMSCRIPTEN_KEEPALIVE TView *Viewer_createView(TViewer *tViewer)
     {
         auto viewer = reinterpret_cast<FilamentViewer *>(tViewer);

thermion_dart/test/camera_tests.dart

@@ -67,7 +67,9 @@ void main() async {
       print(frustum.plane5.normal);
       print(frustum.plane5.constant);
 
-      await viewer.setCameraLensProjection(
+      var camera = await viewer.getMainCamera();
+
+      await camera.setLensProjection(
           near: 10.0, far: 1000.0, aspect: 1.0, focalLength: 28.0);
       frustum = await viewer.getCameraFrustum();
       print(frustum.plane5.normal);
@@ -75,8 +77,8 @@ void main() async {
     });
 
     test('set custom projection/culling matrix', () async {
-      var viewer =
+      var viewer = await testHelper.createViewer(
-          await testHelper.createViewer(bg: kRed, cameraPosition: Vector3(0, 0, 4));
+          bg: kRed, cameraPosition: Vector3(0, 0, 4));
       var camera = await viewer.getMainCamera();
       final cube = await viewer.createGeometry(GeometryHelper.cube());
 
@@ -155,7 +157,7 @@ void main() async {
       expect(await viewer.getActiveCamera(), newCamera);
 
       await testHelper.capture(viewer, "create_camera_new_camera");
-      
+
       final mainCamera = await viewer.getMainCamera();
       await viewer.setActiveCamera(mainCamera);
       expect(await viewer.getActiveCamera(), mainCamera);

thermion_dart/test/gizmo_tests.dart

@@ -0,0 +1,17 @@
+import 'package:test/test.dart';
+
+import 'helpers.dart';
+
+void main() async {
+  final testHelper = TestHelper("gizmo");
+
+  group('gizmo', () {
+    test('add gizmo to scene', () async {
+      var viewer = await testHelper.createViewer();
+      var view = await viewer.getViewAt(0);
+      var gizmo = await viewer.createGizmo(view);
+      await testHelper.capture(viewer, "gizmo_add_to_scene");
+      await viewer.dispose();
+    });
+  });
+}

thermion_dart/test/helpers.dart

@@ -77,6 +77,8 @@ class TestHelper {
     outDir = Directory("$testDir/output/${dir}");
     // outDir.deleteSync(recursive: true);
     outDir.createSync();
+    DynamicLibrary.open('${testDir}/libThermionTextureSwift.dylib');
+
   }
 
   Future capture(ThermionViewer viewer, String outputFilename,
@@ -84,33 +86,28 @@ class TestHelper {
     await Future.delayed(Duration(milliseconds: 10));
     var outPath = p.join(outDir.path, "$outputFilename.bmp");
     var pixelBuffer = await viewer.capture(
-        view: view, swapChain ?? this.swapChain, renderTarget: renderTarget);
+        view: view,
+        swapChain: swapChain ?? this.swapChain,
+        renderTarget: renderTarget);
     view ??= await viewer.getViewAt(0);
     var vp = await view.getViewport();
-    await savePixelBufferToBmp(
+    await savePixelBufferToBmp(pixelBuffer, vp.width, vp.height, outPath);
-        pixelBuffer,
-        vp.width,
-        vp.height,
-        outPath);
     return pixelBuffer;
   }
 
-  Future<int> createTexture(int width, int height) async {
+  Future<ThermionTextureSwift> createTexture(int width, int height) async {
     final packageUri = findPackageRoot('thermion_dart');
-    final lib = ThermionDartTexture1(DynamicLibrary.open(
+    var testDir = Directory("${packageUri.toFilePath()}/test").path;
-        '${packageUri.toFilePath()}/native/lib/macos/swift/libthermion_swift.dylib'));
+   
-    final object = ThermionDartTexture.new1(lib);
+    final object = ThermionTextureSwift.new1();
     object.initWithWidth_height_(width, height);
-    return object.metalTextureAddress;
+    return object;
   }
 
   Future<ThermionViewer> createViewer(
       {img.Color? bg,
       Vector3? cameraPosition,
       viewportDimensions = (width: 500, height: 500)}) async {
-    final texture = await createTexture(
-        viewportDimensions.width, viewportDimensions.height);
-
     final resourceLoader = calloc<ResourceLoaderWrapper>(1);
     var loadToOut = NativeCallable<
         Void Function(Pointer<Char>,

thermion_dart/test/integration_test.dart

@@ -647,16 +647,6 @@ void main() async {
     });
   });
 
-  group("render thread", () {
-    test("request frame on render thread", () async {
-      var viewer = await testHelper.createViewer();
-      viewer.requestFrame();
-
-      await Future.delayed(Duration(milliseconds: 20));
-      await viewer.dispose();
-    });
-  });
-
   // group("unproject", () {
   //   test("unproject", () async {
   //     final dimensions = (width: 1280, height: 768);

thermion_dart/test/render_thread.dart

@@ -0,0 +1,33 @@
+import 'dart:async';
+import 'dart:ffi';
+import 'package:test/test.dart';
+
+import 'helpers.dart';
+
+void main() async {
+  final testHelper = TestHelper("render_thread");
+  group("render thread/capture", () {
+    test("request frame on render thread", () async {
+      var viewer = await testHelper.createViewer();
+      await viewer.setBackgroundColor(1.0, 0.0, 0.0, 1.0);
+
+      var texture = await testHelper.createTexture(500, 500);
+      var renderTarget = await viewer.createRenderTarget(
+          500, 500, texture.metalTextureAddress);
+      
+      final view = await viewer.getViewAt(0);
+      await view.setRenderTarget(renderTarget);
+
+      await viewer.render();
+
+      await Future.delayed(Duration(milliseconds: 1));
+
+      var data = texture.getTextureBytes()!;
+      var pixels = data.bytes.cast<Uint8>().asTypedList(data.length);
+
+      savePixelBufferToBmp(
+          pixels, 500, 500, "${testHelper.testDir}/request_frame.bmp");
+      await viewer.dispose();
+    });
+  });
+}

thermion_dart/test/view_tests.dart

@@ -1,5 +1,3 @@
-import 'dart:math';
-
 import 'package:test/test.dart';
 import 'package:thermion_dart/thermion_dart.dart';
 import 'package:vector_math/vector_math_64.dart';
@@ -9,11 +7,17 @@ void main() async {
   final testHelper = TestHelper("view");
 
   group('view tests', () {
+    test('get camera from view', () async {
+      var viewer = await testHelper.createViewer();
+      var view = await viewer.getViewAt(0);
+      expect(await view.getCamera(), isNotNull);
+    });
+
     test('one swapchain, render view to render target', () async {
       var viewer = await testHelper.createViewer();
 
       final texture = await testHelper.createTexture(500, 500);
-      final renderTarget = await viewer.createRenderTarget(500, 500, texture);
+      final renderTarget = await viewer.createRenderTarget(500, 500, texture.metalTextureAddress);
       viewer.setRenderTarget(renderTarget);
 
       await viewer.setBackgroundColor(1.0, 0, 0, 1);
@@ -27,9 +31,10 @@ void main() async {
           "default_swapchain_default_view_render_target");
     });
 
-    test('create secondary view, same swapchain', () async {
+    test('create secondary view, default swapchain', () async {
       var viewer = await testHelper.createViewer();
       await viewer.setBackgroundColor(1.0, 0, 0, 1);
+
       final cube = await viewer.createGeometry(GeometryHelper.cube());
 
       var mainCamera = await viewer.getMainCamera();
@@ -71,48 +76,28 @@ void main() async {
 
       var mainCamera = await viewer.getMainCamera();
       mainCamera.setTransform(Matrix4.translation(Vector3(0, 0, 5)));
-      final swapChain = await viewer.createSwapChain(200, 400);
+      final swapChain = await viewer.createSwapChain(1, 1);
       await testHelper.capture(
           viewer, "create_swapchain_default_view_default_swapchain");
 
       final view = await viewer.createView();
 
-      final texture = await testHelper.createTexture(400, 400);
+      final texture = await testHelper.createTexture(200, 400);
-      final renderTarget = await viewer.createRenderTarget(400, 400, texture);
+      final renderTarget = await viewer.createRenderTarget(200, 400, texture.metalTextureAddress);
       await view.setRenderTarget(renderTarget);
 
-      await view.updateViewport(400, 400);
+      await view.updateViewport(200, 400);
       view.setCamera(mainCamera);
-      
+      mainCamera.setLensProjection(aspect: 0.5);
+
       await testHelper.capture(
         viewer,
         view: view,
         swapChain: swapChain,
         renderTarget: renderTarget,
-        "create_swapchain_new_view_new_swapchain",
+        "create_swapchain_secondary_view_new_swapchain",
       );
 
-      // var newCamera = await viewer.createCamera();
-      // newCamera.setTransform(Matrix4.translation(Vector3(0.0, 0.0, 10.0)));
-      // newCamera.setLensProjection();
-      // view.setCamera(newCamera);
-
-      // await testHelper.capture(
-      //   viewer,
-      //   "created_view_with_new_camera",
-      //   view: view,
-      // );
-
-      // await testHelper.capture(
-      //   viewer,
-      //   "default_view_main_camera_no_change",
-      // );
-
-      // // await view.updateViewport(200, 400);
-      // // await view.setRenderTarget(renderTarget);
-      // // await viewer.setBackgroundColor(1.0, 0.0, 0.0, 1.0);
-      // // await testHelper.capture(viewer, "create_view_with_render_target",
-      // //     renderTarget: renderTarget);
       await viewer.dispose();
     });
   });

thermion_dart/test/viewport_gizmo.dart

@@ -47,9 +47,9 @@ late String testDir;
 void main() async {
   final packageUri = findPackageRoot('thermion_dart');
   testDir = Directory("${packageUri.toFilePath()}/test").path;
-  final lib = ThermionDartTexture1(DynamicLibrary.open(
+  final lib = ThermionTexture1(DynamicLibrary.open(
       '${packageUri.toFilePath()}/native/lib/macos/swift/libthermion_swift.dylib'));
-  final object = ThermionDartTexture.new1(lib);
+  final object = ThermionTexture.new1(lib);
   object.initWithWidth_height_(500, 500);
 
   final resourceLoader = calloc<ResourceLoaderWrapper>(1);

thermion_dart/test/viewport_grid.dart

@@ -43,9 +43,9 @@ late String testDir;
 void main() async {
   final packageUri = findPackageRoot('thermion_dart');
   testDir = Directory("${packageUri.toFilePath()}/test").path;
-  final lib = ThermionDartTexture1(DynamicLibrary.open(
+  final lib = ThermionTexture1(DynamicLibrary.open(
       '${packageUri.toFilePath()}/native/lib/macos/swift/libthermion_swift.dylib'));
-  final object = ThermionDartTexture.new1(lib);
+  final object = ThermionTexture.new1(lib);
   object.initWithWidth_height_(500, 500);
 
   final resourceLoader = calloc<ResourceLoaderWrapper>(1);

thermion_flutter/thermion_flutter/lib/src/thermion_flutter_plugin.dart

@@ -1,8 +1,6 @@
 import 'dart:async';
 import 'package:thermion_dart/thermion_dart.dart';
-import 'package:flutter/widgets.dart';
 import 'package:thermion_flutter_platform_interface/thermion_flutter_platform_interface.dart';
-import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
 
 ///
 /// Handles all platform-specific initialization to create a backing rendering
@@ -11,118 +9,30 @@ import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dar
 /// Call [createViewerWithOptions] to create an instance of [ThermionViewer].
 ///
 class ThermionFlutterPlugin {
-  ThermionFlutterPlugin._();
 
-  static AppLifecycleListener? _appLifecycleListener;
+  ThermionFlutterPlugin._();
 
   static bool _initializing = false;
 
   static ThermionViewer? _viewer;
 
-  static bool _wasRenderingOnInactive = false;
+  static Future<ThermionViewer> createViewer(
-
+      {ThermionFlutterOptions options =
-  static void _handleStateChange(AppLifecycleState state) async {
+          const ThermionFlutterOptions.empty()}) async {
-    if (_viewer == null) {
+    
-      return;
-    }
-
-    await _viewer!.initialized;
-    switch (state) {
-      case AppLifecycleState.detached:
-        if (!_wasRenderingOnInactive) {
-          _wasRenderingOnInactive = _viewer!.rendering;
-        }
-        await _viewer!.setRendering(false);
-        break;
-      case AppLifecycleState.hidden:
-        if (!_wasRenderingOnInactive) {
-          _wasRenderingOnInactive = _viewer!.rendering;
-        }
-        await _viewer!.setRendering(false);
-        break;
-      case AppLifecycleState.inactive:
-        if (!_wasRenderingOnInactive) {
-          _wasRenderingOnInactive = _viewer!.rendering;
-        }
-        // on Windows in particular, restoring a window after minimizing stalls the renderer (and the whole application) for a considerable length of time.
-        // disabling rendering on minimize seems to fix the issue (so I wonder if there's some kind of command buffer that's filling up while the window is minimized).
-        await _viewer!.setRendering(false);
-        break;
-      case AppLifecycleState.paused:
-        if (!_wasRenderingOnInactive) {
-          _wasRenderingOnInactive = _viewer!.rendering;
-        }
-        await _viewer!.setRendering(false);
-        break;
-      case AppLifecycleState.resumed:
-        await _viewer!.setRendering(_wasRenderingOnInactive);
-        break;
-    }
-  }
-
-  @Deprecated("Use createViewerWithOptions")
-  static Future<ThermionViewer> createViewer({String? uberArchivePath}) async {
     if (_initializing) {
       throw Exception("Existing call to createViewer has not completed.");
     }
     _initializing = true;
 
-    _viewer = await ThermionFlutterPlatform.instance
-        .createViewer(uberarchivePath: uberArchivePath);
-    _appLifecycleListener = AppLifecycleListener(
-      onStateChange: _handleStateChange,
-    );
-    _viewer!.onDispose(() async {
-      _viewer = null;
-      _appLifecycleListener?.dispose();
-      _appLifecycleListener = null;
-    });
-    _initializing = false;
-    return _viewer!;
-  }
-
-  static Future<ThermionViewer> createViewerWithOptions(
-      {ThermionFlutterOptions options = const ThermionFlutterOptions.empty()}) async {
-    if (_initializing) {
-      throw Exception("Existing call to createViewer has not completed.");
-    }
-    _initializing = true;
     _viewer =
-        await ThermionFlutterPlatform.instance.createViewerWithOptions(options);
+        await ThermionFlutterPlatform.instance.createViewer(options: options);
-    _appLifecycleListener = AppLifecycleListener(
+
-      onStateChange: _handleStateChange,
-    );
     _viewer!.onDispose(() async {
       _viewer = null;
-      _appLifecycleListener?.dispose();
-      _appLifecycleListener = null;
     });
     _initializing = false;
     return _viewer!;
   }
 
-  static Future<ThermionFlutterTexture?> createTexture(
-      double width,
-      double height,
-      double offsetLeft,
-      double offsetTop,
-      double pixelRatio) async {
-    return ThermionFlutterPlatform.instance
-        .createTexture(width, height, offsetLeft, offsetTop, pixelRatio);
-  }
-
-  static Future destroyTexture(ThermionFlutterTexture texture) async {
-    return ThermionFlutterPlatform.instance.destroyTexture(texture);
-  }
-
-  static Future<ThermionFlutterTexture?> resizeTexture(
-      ThermionFlutterTexture texture,
-      int width,
-      int height,
-      int offsetLeft,
-      int offsetTop,
-      double pixelRatio) async {
-    return ThermionFlutterPlatform.instance.resizeTexture(
-        texture, width, height, offsetLeft, offsetTop, pixelRatio);
-  }
 }

thermion_flutter/thermion_flutter/lib/src/widgets/src/pixel_ratio_aware.dart

@@ -0,0 +1,12 @@
+import 'package:flutter/widgets.dart';
+
+class PixelRatioAware extends StatelessWidget {
+  final Widget Function(BuildContext context, double pixelRatio) builder;
+
+  const PixelRatioAware({Key? key, required this.builder}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return builder(context, MediaQuery.of(context).devicePixelRatio);
+  }
+}

thermion_flutter/thermion_flutter/lib/src/widgets/src/thermion_listener_widget.dart

@@ -5,6 +5,7 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:thermion_dart/thermion_dart.dart';
+import 'package:thermion_flutter/src/widgets/src/pixel_ratio_aware.dart';
 import 'package:vector_math/vector_math_64.dart';
 
 extension OffsetExtension on Offset {
@@ -79,54 +80,64 @@ class _ThermionListenerWidgetState extends State<ThermionListenerWidget> {
     HardwareKeyboard.instance.removeHandler(_handleKeyEvent);
   }
 
-  Widget _desktop() {
+  Widget _desktop(double pixelRatio) {
     return Listener(
-      onPointerHover: (event) => widget.gestureHandler
+      onPointerHover: (event) => widget.gestureHandler.onPointerHover(
-          .onPointerHover(event.localPosition.toVector2(), event.delta.toVector2()),
+          event.localPosition.toVector2() * pixelRatio,
+          event.delta.toVector2() * pixelRatio),
       onPointerSignal: (PointerSignalEvent pointerSignal) {
         if (pointerSignal is PointerScrollEvent) {
           widget.gestureHandler.onPointerScroll(
-              pointerSignal.localPosition.toVector2(),
+              pointerSignal.localPosition.toVector2() * pixelRatio,
-              pointerSignal.scrollDelta.dy);
+              pointerSignal.scrollDelta.dy * pixelRatio);
         }
       },
       onPointerPanZoomStart: (pzs) {
         throw Exception("TODO - is this a pinch zoom on laptop trackpad?");
       },
-      onPointerDown: (d) => widget.gestureHandler
+      onPointerDown: (d) => widget.gestureHandler.onPointerDown(
-          .onPointerDown(d.localPosition.toVector2(), d.buttons & kMiddleMouseButton != 0),
+          d.localPosition.toVector2() * pixelRatio,
-      onPointerMove: (d) => widget.gestureHandler
+          d.buttons & kMiddleMouseButton != 0),
-          .onPointerMove(d.localPosition.toVector2(), d.delta.toVector2(), d.buttons & kMiddleMouseButton != 0),
+      onPointerMove: (d) => widget.gestureHandler.onPointerMove(
-      onPointerUp: (d) => widget.gestureHandler.onPointerUp(d.buttons & kMiddleMouseButton != 0),
+          d.localPosition.toVector2() * pixelRatio,
+          d.delta.toVector2() * pixelRatio,
+          d.buttons & kMiddleMouseButton != 0),
+      onPointerUp: (d) => widget.gestureHandler
+          .onPointerUp(d.buttons & kMiddleMouseButton != 0),
       child: widget.child,
     );
   }
 
-  Widget _mobile() {
+  Widget _mobile(double pixelRatio) {
-    return _MobileListenerWidget(gestureHandler: widget.gestureHandler);
+    return _MobileListenerWidget(
+        gestureHandler: widget.gestureHandler, pixelRatio: pixelRatio);
   }
 
   @override
   Widget build(BuildContext context) {
-    return FutureBuilder(
+    return PixelRatioAware(builder: (ctx, pixelRatio) {
-        future: widget.gestureHandler.initialized,
+      return FutureBuilder(
-        builder: (_, initialized) {
+          initialData: 1.0,
-          if (initialized.data != true) {
+          future: widget.gestureHandler.initialized,
-            return widget.child ?? Container();
+          builder: (_, initialized) {
-          }
+            if (initialized.data != true) {
-          return Stack(children: [
+              return widget.child ?? Container();
-            if (widget.child != null) Positioned.fill(child: widget.child!),
+            }
-            if (isDesktop) Positioned.fill(child: _desktop()),
+            return Stack(children: [
-            if (!isDesktop) Positioned.fill(child: _mobile())
+              if (widget.child != null) Positioned.fill(child: widget.child!),
-          ]);
+              if (isDesktop) Positioned.fill(child: _desktop(pixelRatio)),
-        });
+              if (!isDesktop) Positioned.fill(child: _mobile(pixelRatio))
+            ]);
+          });
+    });
   }
 }
 
 class _MobileListenerWidget extends StatefulWidget {
   final InputHandler gestureHandler;
+  final double pixelRatio;
 
-  const _MobileListenerWidget({Key? key, required this.gestureHandler})
+  const _MobileListenerWidget({Key? key, required this.gestureHandler, required this.pixelRatio})
       : super(key: key);
 
   @override
@@ -146,7 +157,7 @@ class _MobileListenerWidgetState extends State<_MobileListenerWidget> {
     return GestureDetector(
       behavior: HitTestBehavior.translucent,
       onTapDown: (details) => widget.gestureHandler
-          .onPointerDown(details.localPosition.toVector2(), false),
+          .onPointerDown(details.localPosition.toVector2() * widget.pixelRatio, false),
       onDoubleTap: () {
         widget.gestureHandler.setActionForType(InputType.SCALE1,
             isPan ? InputAction.TRANSLATE : InputAction.ROTATE);

thermion_flutter/thermion_flutter/lib/src/widgets/src/thermion_texture_widget.dart

@@ -0,0 +1,270 @@
+import 'dart:async';
+import 'package:flutter/material.dart';
+import 'package:thermion_dart/src/viewer/src/shared_types/view.dart' as t;
+import 'package:thermion_flutter/src/widgets/src/resize_observer.dart';
+import 'package:thermion_flutter/thermion_flutter.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
+import 'package:vector_math/vector_math_64.dart' hide Colors;
+
+class ThermionTextureWidget extends StatefulWidget {
+  final ThermionViewer viewer;
+
+  final t.View view;
+
+  final Widget? initial;
+
+  const ThermionTextureWidget(
+      {super.key, required this.viewer, required this.view, this.initial});
+
+  @override
+  State<StatefulWidget> createState() {
+    return _ThermionTextureWidgetState();
+  }
+}
+
+class _ThermionTextureWidgetState extends State<ThermionTextureWidget> {
+  ThermionFlutterTexture? _texture;
+  RenderTarget? _renderTarget;
+
+  @override
+  void dispose() {
+    super.dispose();
+    _texture?.destroy();
+  }
+
+  @override
+  void initState() {
+    WidgetsBinding.instance.addPostFrameCallback((timeStamp) async {
+      await widget.viewer.initialized;
+
+      var dpr = MediaQuery.of(context).devicePixelRatio;
+
+      var size = ((context.findRenderObject()) as RenderBox).size;
+      var width = (size.width * dpr).ceil();
+      var height = (size.height * dpr).ceil();
+
+      _texture =
+          await ThermionFlutterPlatform.instance.createTexture(width, height);
+
+      _renderTarget = await widget.viewer.createRenderTarget(
+          _texture!.width, _texture!.height, _texture!.hardwareId);
+
+      await widget.view.setRenderTarget(_renderTarget!);
+
+      await widget.view.updateViewport(width, height);
+      var camera = await widget.view.getCamera();
+      await camera.setLensProjection(aspect: width / height);
+
+      if (mounted) {
+        setState(() {});
+      }
+
+      _requestFrame();
+
+      widget.viewer.onDispose(() async {
+        var texture = _texture;
+        if (mounted) {
+          setState(() {});
+        }
+        if (texture != null) {
+          _renderTarget = await widget.viewer.createRenderTarget(
+              texture.width, texture.height, texture.flutterId);
+          await widget.view.setRenderTarget(null);
+          await _renderTarget!.destroy();
+          texture.destroy();
+        }
+      });
+    });
+    super.initState();
+  }
+
+  bool _rendering = false;
+
+  void _requestFrame() {
+    WidgetsBinding.instance.scheduleFrameCallback((d) async {
+      if (!_rendering) {
+        _rendering = true;
+        await widget.viewer.requestFrame();
+        await _texture?.markFrameAvailable();
+        _rendering = false;
+      }
+      _requestFrame();
+    });
+  }
+
+  bool _resizing = false;
+  Timer? _resizeTimer;
+
+  Future _resize(Size newSize) async {
+    
+    _resizeTimer?.cancel();
+
+    _resizeTimer = Timer(const Duration(milliseconds: 10), () async {
+      if (_resizing || !mounted) {
+        return;
+      }
+      _resizeTimer!.cancel();
+      _resizing = true;
+
+      if (!mounted) {
+        return;
+      }
+
+      newSize *= MediaQuery.of(context).devicePixelRatio;
+
+      var newWidth = newSize.width.ceil();
+      var newHeight = newSize.height.ceil();
+
+      await _texture?.resize(
+        newWidth,
+        newHeight,
+        0,
+        0,
+      );
+
+      await widget.view.updateViewport(newWidth, newHeight);
+      var camera = await widget.view.getCamera();
+      await camera.setLensProjection(aspect: newWidth / newHeight);
+
+      setState(() {});
+      _resizing = false;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_texture == null) {
+      return widget.initial ?? Container(color: Colors.red);
+    }
+
+    return Stack(children: [
+      Positioned.fill(
+          child: ResizeObserver(
+              onResized: _resize,
+              child: Stack(children: [
+                Positioned.fill(
+                    child: Texture(
+                  key: ObjectKey("flutter_texture_${_texture!.flutterId}"),
+                  textureId: _texture!.flutterId,
+                  filterQuality: FilterQuality.none,
+                  freeze: false,
+                ))
+              ]))),
+      Align(
+        alignment: Alignment.bottomLeft,
+        child: ElevatedButton(
+            onPressed: () async {
+              var img =
+                  await widget.viewer.capture(renderTarget: _renderTarget!);
+              print(img);
+            },
+            child: Text("CAPTURE")),
+      )
+    ]);
+  }
+}
+
+
+
+// class _ThermionWidgetState extends State<ThermionWidget> {
+  
+//   ThermionFlutterTexture? _texture;
+
+//   @override
+//   void initState() {
+//     WidgetsBinding.instance.addPostFrameCallback((timeStamp) async {
+//       await widget.viewer.initialized;
+//       widget.viewer.onDispose(() async {
+//         _rendering = false;
+
+//         if (_texture != null) {
+//           var texture = _texture;
+//           _texture = null;
+//           if (mounted) {
+//             setState(() {});
+//           }
+//           await ThermionFlutterPlugin.destroyTexture(texture!);
+//         }
+//       });
+//       var dpr = MediaQuery.of(context).devicePixelRatio;
+
+//       var size = ((context.findRenderObject()) as RenderBox).size;
+//       _texture = await ThermionFlutterPlugin.createTexture(
+//           size.width, size.height, 0, 0, dpr);
+
+//       if (mounted) {
+//         setState(() {});
+//       }
+
+//       _requestFrame();
+//     });
+//     super.initState();
+//   }
+
+//   bool _rendering = false;
+
+//   void _requestFrame() {
+//     WidgetsBinding.instance.scheduleFrameCallback((d) async {
+//       if (!_rendering) {
+//         _rendering = true;
+//         await widget.viewer.requestFrame();
+//         _rendering = false;
+//       }
+//       _requestFrame();
+//     });
+//   }
+
+//   bool _resizing = false;
+//   Timer? _resizeTimer;
+
+//   Future _resizeTexture(Size newSize) async {
+//     _resizeTimer?.cancel();
+//     _resizeTimer = Timer(const Duration(milliseconds: 500), () async {
+//       if (_resizing || !mounted) {
+//         return;
+//       }
+//       _resizeTimer!.cancel();
+//       _resizing = true;
+
+//       if (!mounted) {
+//         return;
+//       }
+
+//       var dpr = MediaQuery.of(context).devicePixelRatio;
+
+//       _texture.resize(newSize.width.ceil(), newSize.height.ceil(), 0, 0, dpr);
+//       setState(() {});
+//       _resizing = false;
+//     });
+//   }
+
+//   @override
+//   Widget build(BuildContext context) {
+//     if (_texture == null || _resizing) {
+//       return widget.initial ??
+//           Container(
+//               color:
+//                   kIsWeb ? const Color.fromARGB(0, 170, 129, 129) : Colors.red);
+//     }
+
+//     var textureWidget = Texture(
+//       key: ObjectKey("texture_${_texture!.flutterId}"),
+//       textureId: _texture!.flutterId!,
+//       filterQuality: FilterQuality.none,
+//       freeze: false,
+//     );
+
+//     return ResizeObserver(
+//         onResized: _resizeTexture,
+//         child: Stack(children: [
+//           Positioned.fill(
+//               child: Platform.isLinux || Platform.isWindows
+//                   ? Transform(
+//                       alignment: Alignment.center,
+//                       transform: Matrix4.rotationX(
+//                           pi), // TODO - this rotation is due to OpenGL texture coordinate working in a different space from Flutter, can we move this to the C++ side somewhere?
+//                       child: textureWidget)
+//                   : textureWidget)
+//         ]));
+//   }
+// }

thermion_flutter/thermion_flutter/lib/src/widgets/src/thermion_widget.dart

@@ -1,18 +1,27 @@
 import 'dart:io';
-import 'dart:math';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:thermion_flutter/src/widgets/src/thermion_texture_widget.dart';
 import 'package:thermion_flutter/src/widgets/src/thermion_widget_web.dart';
-import 'package:thermion_flutter/src/widgets/src/transparent_filament_widget.dart';
-import 'dart:async';
-
-import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
 import 'package:thermion_flutter/thermion_flutter.dart';
 import 'package:thermion_flutter_web/thermion_flutter_web_options.dart';
-import 'resize_observer.dart';
+import 'package:thermion_dart/src/viewer/src/shared_types/view.dart' as t;
+import 'thermion_widget_windows.dart';
 
 class ThermionWidget extends StatefulWidget {
+  ///
+  /// The viewer.
+  ///
   final ThermionViewer viewer;
+
+  ///
+  /// The view.
+  ///
+  final t.View? view;
+
+  ///
+  /// The options to use when creating this widget.
+  ///
   final ThermionFlutterOptions? options;
 
   ///
@@ -22,130 +31,51 @@ class ThermionWidget extends StatefulWidget {
   final Widget? initial;
 
   const ThermionWidget(
-      {Key? key, this.initial, required this.viewer, this.options})
+      {Key? key, this.initial, required this.viewer, this.view, this.options})
       : super(key: key);
 
-  @override
+  State<ThermionWidget> createState() => _ThermionWidgetState();
-  _ThermionWidgetState createState() => _ThermionWidgetState();
 }
 
 class _ThermionWidgetState extends State<ThermionWidget> {
-  ThermionFlutterTexture? _texture;
+  t.View? view;
 
   @override
   void initState() {
-    WidgetsBinding.instance.addPostFrameCallback((timeStamp) async {
-      await widget.viewer.initialized;
-      widget.viewer.onDispose(() async {
-        if (_texture != null) {
-          var texture = _texture;
-          _texture = null;
-          if (mounted) {
-            setState(() {});
-          }
-          await ThermionFlutterPlugin.destroyTexture(texture!);
-        }
-      });
-      var dpr = MediaQuery.of(context).devicePixelRatio;
-
-      var size = ((context.findRenderObject()) as RenderBox).size;
-      _texture = await ThermionFlutterPlugin.createTexture(
-          size.width, size.height, 0, 0, dpr);
-
-      if (mounted) {
-        setState(() {});
-      }
-
-      _requestFrame();
-    });
     super.initState();
+    initialize();
   }
 
-
+  Future initialize() async {
-bool _rendering = false;
+    if (widget.view != null) {
-
+      view = widget.view;
-void _requestFrame() {
+    } else {
-  WidgetsBinding.instance.scheduleFrameCallback((d) async {
+      view = await widget.viewer.getViewAt(0);
-    if (!_rendering) {
-      _rendering = true;
-      await widget.viewer.requestFrame();
-      _rendering = false;
     }
-    _requestFrame();
+    setState(() {});
-  });
-}
-
-  bool _resizing = false;
-  Timer? _resizeTimer;
-
-  Future _resizeTexture(Size newSize) async {
-    _resizeTimer?.cancel();
-    _resizeTimer = Timer(const Duration(milliseconds: 500), () async {
-      if (_resizing || !mounted) {
-        return;
-      }
-      _resizeTimer!.cancel();
-      _resizing = true;
-      var oldTexture = _texture;
-      _texture = null;
-      if (!mounted) {
-        return;
-      }
-
-      var dpr = MediaQuery.of(context).devicePixelRatio;
-
-      _texture = await ThermionFlutterPlugin.resizeTexture(
-          oldTexture!, newSize.width.ceil(), newSize.height.ceil(), 0, 0, dpr);
-      setState(() {});
-      _resizing = false;
-    });
   }
 
   @override
   Widget build(BuildContext context) {
+    if (view == null) {
+      return widget.initial ?? Container(color: Colors.red);
+    }
+
+    // Windows & Web don't support imported textures yet
     if (kIsWeb) {
-      if (_texture == null || _resizing) {
+      return ThermionWidgetWeb(
-        return widget.initial ?? Container(color: Colors.red);
+          viewer: widget.viewer,
-      }
+          options: widget.options as ThermionFlutterWebOptions);
-      return ResizeObserver(
-          onResized: _resizeTexture,
-          child: ThermionWidgetWeb(
-              options: widget.options as ThermionFlutterWebOptions?));
     }
 
-    if (_texture?.usesBackingWindow == true) {
+    if (Platform.isWindows) {
-      return ResizeObserver(
+      return ThermionWidgetWindows(viewer: widget.viewer);
-          onResized: _resizeTexture,
-          child: Stack(children: [
-            Positioned.fill(child: CustomPaint(painter: TransparencyPainter()))
-          ]));
     }
 
-    if (_texture == null || _resizing) {
+    return ThermionTextureWidget(
-      return widget.initial ??
+        key: ObjectKey(view!),
-          Container(
+        initial: widget.initial,
-              color:
+        viewer: widget.viewer,
-                  kIsWeb ? const Color.fromARGB(0, 170, 129, 129) : Colors.red);
+        view: view!);
-    }
-
-    var textureWidget = Texture(
-      key: ObjectKey("texture_${_texture!.flutterTextureId}"),
-      textureId: _texture!.flutterTextureId!,
-      filterQuality: FilterQuality.none,
-      freeze: false,
-    );
-
-    return ResizeObserver(
-        onResized: _resizeTexture,
-        child: Stack(children: [
-          Positioned.fill(
-              child: Platform.isLinux || Platform.isWindows
-                  ? Transform(
-                      alignment: Alignment.center,
-                      transform: Matrix4.rotationX(
-                          pi), // TODO - this rotation is due to OpenGL texture coordinate working in a different space from Flutter, can we move this to the C++ side somewhere?
-                      child: textureWidget)
-                  : textureWidget)
-        ]));
   }
 }

thermion_flutter/thermion_flutter/lib/src/widgets/src/thermion_widget_web_impl.dart

@@ -2,18 +2,28 @@ import 'dart:js_util';
 import 'dart:ui' as ui;
 import 'dart:ui_web' as ui_web;
 import 'package:logging/logging.dart';
+import 'package:thermion_flutter/thermion_flutter.dart';
 import 'package:thermion_flutter_web/thermion_flutter_web_options.dart';
 import 'package:web/web.dart';
 import 'package:flutter/widgets.dart';
 
 class ThermionWidgetWeb extends StatelessWidget {
   final ThermionFlutterWebOptions options;
+  final ThermionViewer viewer;
 
   const ThermionWidgetWeb(
-      {super.key, this.options = const ThermionFlutterWebOptions.empty()});
+      {super.key, this.options = const ThermionFlutterWebOptions.empty(), required this.viewer});
 
   @override
   Widget build(BuildContext context) {
+    if (_texture == null || _resizing) {
+      return widget.initial ?? Container(color: Colors.red);
+    }
+    return ResizeObserver(
+        onResized: _resizeTexture,
+        child: ThermionWidgetWeb(
+            options: widget.options as ThermionFlutterWebOptions?));
+
     if (options?.importCanvasAsWidget == true) {
       return _ImageCopyingWidget();
     }

thermion_flutter/thermion_flutter/lib/src/widgets/src/thermion_widget_web_stub.dart

@@ -1,14 +1,16 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
-import 'package:thermion_flutter_ffi/thermion_flutter_ffi.dart';
+import 'package:thermion_flutter/thermion_flutter.dart';
 import 'package:thermion_flutter_web/thermion_flutter_web_options.dart';
 
-class ThermionWidgetWeb extends StatefulWidget {
+class ThermionWidgetWeb extends StatelessWidget {
   final ThermionFlutterWebOptions? options;
+  final ThermionViewer viewer;
+
+  const ThermionWidgetWeb({super.key, required this.options, required this.viewer});
 
-  const ThermionWidgetWeb({super.key, required this.options});
-  
   @override
-  // ignore: no_logic_in_create_state
+  Widget build(BuildContext context) {
-  State<StatefulWidget> createState() => throw Exception();
+    throw Exception("STUB");
+  }
 }

thermion_flutter/thermion_flutter/lib/src/widgets/src/thermion_widget_windows.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/widgets.dart';
+import 'package:thermion_flutter/thermion_flutter.dart';
+
+class ThermionWidgetWindows extends StatelessWidget {
+  
+  final ThermionViewer viewer;
+
+  const ThermionWidgetWindows({super.key, required this.viewer});
+  @override
+  Widget build(BuildContext context) {
+    // TODO: implement build
+    throw UnimplementedError();
+  }
+}

thermion_flutter/thermion_flutter/macos/Classes/SwiftThermionFlutterPlugin.swift

@@ -55,14 +55,7 @@ public class SwiftThermionFlutterPlugin: NSObject, FlutterPlugin {
         let instance:SwiftThermionFlutterPlugin = Unmanaged<SwiftThermionFlutterPlugin>.fromOpaque(resourcesPtr!).takeUnretainedValue()
         instance.resources.removeValue(forKey:UInt32(rbuf.id))
     }
-
+      
-    var markTextureFrameAvailable : @convention(c) (UnsafeMutableRawPointer?) -> () = { instancePtr in
-        let instance:SwiftThermionFlutterPlugin = Unmanaged<SwiftThermionFlutterPlugin>.fromOpaque(instancePtr!).takeUnretainedValue()
-        if(instance.texture != nil) {
-            instance.registry.textureFrameAvailable(instance.texture!.flutterTextureId)
-        }
-    }
-       
 
     public static func register(with registrar: FlutterPluginRegistrar) {
         let _messenger = registrar.messenger;
@@ -88,12 +81,12 @@ public class SwiftThermionFlutterPlugin: NSObject, FlutterPlugin {
                     resourceLoaderWrapper = make_resource_loader(loadResource, freeResource, Unmanaged.passUnretained(self).toOpaque())
                 }
                 result(Int64(Int(bitPattern: resourceLoaderWrapper!)))
+            case "markTextureFrameAvailable":
+                let flutterTextureId = call.arguments as! Int64
+                registry.textureFrameAvailable(flutterTextureId)
+                result(nil)
             case "getRenderCallback":
-                if(renderCallbackHolder.isEmpty) {
+                result(nil)
-                    renderCallbackHolder.append(unsafeBitCast(markTextureFrameAvailable, to:Int64.self))
-                    renderCallbackHolder.append(unsafeBitCast(Unmanaged.passUnretained(self), to:UInt64.self))
-                }
-                result(renderCallbackHolder)
             case "getDriverPlatform":
                 result(nil)
             case "getSharedContext":

thermion_flutter/thermion_flutter/macos/Classes/ThermionFlutterTexture.swift

@@ -6,11 +6,11 @@ public class ThermionFlutterTexture : NSObject, FlutterTexture {
     
     var flutterTextureId: Int64 = -1
     var registry: FlutterTextureRegistry
-    var texture: ThermionTexture 
+    var texture: ThermionTextureSwift 
     
     init(registry:FlutterTextureRegistry, width:Int64, height:Int64) {
         self.registry = registry
-        self.texture = ThermionTexture(width:width, height: height)
+        self.texture = ThermionTextureSwift(width:width, height: height)
         super.init()
         self.flutterTextureId = registry.register(self)
     }

thermion_flutter/thermion_flutter/test/cpp/test.cpp

@@ -14,7 +14,7 @@
 #include "ResourceBuffer.hpp"
 
 using namespace filament;
-using namespace thermion_filament;
+using namespace thermion;
 using namespace std;
 
 int _i = 0;

thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_android.dart

@@ -0,0 +1,130 @@
+import 'dart:async';
+import 'package:flutter/services.dart';
+import 'package:thermion_dart/thermion_dart.dart';
+import 'package:thermion_dart/src/viewer/src/ffi/thermion_viewer_ffi.dart';
+import 'package:thermion_flutter_ffi/thermion_flutter_method_channel_interface.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_platform_interface.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
+import 'package:logging/logging.dart';
+
+///
+/// An implementation of [ThermionFlutterPlatform] that uses
+/// Flutter platform channels to create a rendering context,
+/// resource loaders, and surface/render target(s).
+///
+class ThermionFlutterAndroid
+    extends ThermionFlutterMethodChannelInterface {
+  final _channel = const MethodChannel("dev.thermion.flutter/event");
+  final _logger = Logger("ThermionFlutterFFI");
+
+  ThermionViewerFFI? _viewer;
+
+  ThermionFlutterAndroid._() {}
+
+  RenderTarget? _renderTarget;
+  SwapChain? _swapChain;
+
+  static void registerWith() {
+    ThermionFlutterPlatform.instance = ThermionFlutterAndroid._();
+  }
+
+  final _textures = <ThermionFlutterTexture>{};
+
+  bool _creatingTexture = false;
+  bool _destroyingTexture = false;
+
+  bool _resizing = false;
+
+  ///
+  /// Create a rendering surface.
+  ///
+  /// This is internal; unless you are [thermion_*] package developer, don't
+  /// call this yourself.
+  ///
+  /// The name here is slightly misleading because we only create
+  /// a texture render target on macOS and iOS; on Android, we render into
+  /// a native window derived from a Surface, and on Windows we render into
+  /// a HWND.
+  ///
+  /// Currently, this only supports a single "texture" (aka rendering surface)
+  /// at any given time. If a [ThermionWidget] is disposed, it will call
+  /// [destroyTexture]; if it is resized, it will call [resizeTexture].
+  ///
+  /// In future, we probably want to be able to create multiple distinct
+  /// textures/render targets. This would make it possible to have multiple
+  /// Flutter Texture widgets, each with its own Filament View attached.
+  /// The current design doesn't accommodate this (for example, it seems we can
+  /// only create a single native window from a Surface at any one time).
+  ///
+  Future<ThermionFlutterTexture?> createTexture(int width, int height) async {
+    throw Exception("TODO");
+    // note that when [ThermionWidget] is disposed, we don't destroy the
+    // texture; instead, we keep it around in case a subsequent call requests
+    // a texture of the same size.
+
+    // if (_textures.length > 1) {
+    //   throw Exception("Multiple textures not yet supported");
+    // } else if (_textures.length == 1) {
+    //   if (_textures.first.height == physicalHeight &&
+    //       _textures.first.width == physicalWidth) {
+    //     return _textures.first;
+    //   } else {
+    //     await _viewer!.setRendering(false);
+    //     await _swapChain?.destroy();
+    //     await destroyTexture(_textures.first);
+    //     _textures.clear();
+    //   }
+    // }
+
+    // _creatingTexture = true;
+
+    // var result = await _channel.invokeMethod("createTexture",
+    //     [physicalWidth, physicalHeight, offsetLeft, offsetLeft]);
+
+    // if (result == null || (result[0] == -1)) {
+    //   throw Exception("Failed to create texture");
+    // }
+    // final flutterTextureId = result[0] as int?;
+    // final hardwareTextureId = result[1] as int?;
+    // final surfaceAddress = result[2] as int?;
+
+    // _logger.info(
+    //     "Created texture with flutter texture id ${flutterTextureId}, hardwareTextureId $hardwareTextureId and surfaceAddress $surfaceAddress");
+
+    // final texture = ThermionFlutterTexture(flutterTextureId, hardwareTextureId,
+    //     physicalWidth, physicalHeight, surfaceAddress);
+
+    // await _viewer?.createSwapChain(physicalWidth, physicalHeight,
+    //     surface: texture.surfaceAddress == null
+    //         ? nullptr
+    //         : Pointer<Void>.fromAddress(texture.surfaceAddress!));
+
+    // if (texture.hardwareTextureId != null) {
+    //   if (_renderTarget != null) {
+    //     await _renderTarget!.destroy();
+    //   }
+    //   // ignore: unused_local_variable
+    //   _renderTarget = await _viewer?.createRenderTarget(
+    //       physicalWidth, physicalHeight, texture.hardwareTextureId!);
+    // }
+
+    // await _viewer?.updateViewportAndCameraProjection(
+    //     physicalWidth.toDouble(), physicalHeight.toDouble());
+    // _creatingTexture = false;
+    // _textures.add(texture);
+    // return texture;
+  }
+
+  ///
+  /// Called by [ThermionWidget] to resize a texture. Don't call this yourself.
+  ///
+  @override
+  Future resizeWindow(
+    int width,
+    int height,
+    int offsetLeft,
+    int offsetTop,
+  ) async {
+    throw Exception("Not supported on iOS");
+  }
+}

thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_ffi.dart

@@ -1,256 +1,4 @@
-import 'dart:async';
+export 'thermion_flutter_android.dart';
-import 'package:flutter/services.dart';
+export 'thermion_flutter_macos.dart';
-import 'dart:ffi';
+export 'thermion_flutter_windows.dart';
-import 'package:thermion_dart/thermion_dart.dart';
+export 'thermion_flutter_ios.dart';
-import 'package:thermion_dart/src/viewer/src/ffi/thermion_viewer_ffi.dart';
-import 'package:thermion_flutter_platform_interface/thermion_flutter_platform_interface.dart';
-import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
-import 'package:logging/logging.dart';
-
-///
-/// An implementation of [ThermionFlutterPlatform] that uses a Flutter platform
-/// channel to create a rendering context, resource loaders, and
-/// render target(s).
-///
-class ThermionFlutterFFI extends ThermionFlutterPlatform {
-  final _channel = const MethodChannel("dev.thermion.flutter/event");
-  final _logger = Logger("ThermionFlutterFFI");
-
-  ThermionViewerFFI? _viewer;
-
-  ThermionFlutterFFI._() {}
-
-  RenderTarget? _renderTarget;
-  SwapChain? _swapChain;
-
-  static void registerWith() {
-    ThermionFlutterPlatform.instance = ThermionFlutterFFI._();
-  }
-
-  final _textures = <ThermionFlutterTexture>{};
-
-  Future<ThermionViewer> createViewerWithOptions(
-      ThermionFlutterOptions options) async {
-    return createViewer(uberarchivePath: options.uberarchivePath);
-  }
-
-  Future<ThermionViewer> createViewer({String? uberarchivePath}) async {
-    var resourceLoader = Pointer<Void>.fromAddress(
-        await _channel.invokeMethod("getResourceLoaderWrapper"));
-
-    if (resourceLoader == nullptr) {
-      throw Exception("Failed to get resource loader");
-    }
-
-    var renderCallbackResult = await _channel.invokeMethod("getRenderCallback");
-    var renderCallback =
-        Pointer<NativeFunction<Void Function(Pointer<Void>)>>.fromAddress(
-            renderCallbackResult[0]);
-    var renderCallbackOwner =
-        Pointer<Void>.fromAddress(renderCallbackResult[1]);
-
-    var driverPlatform = await _channel.invokeMethod("getDriverPlatform");
-    var driverPtr = driverPlatform == null
-        ? nullptr
-        : Pointer<Void>.fromAddress(driverPlatform);
-
-    var sharedContext = await _channel.invokeMethod("getSharedContext");
-
-    var sharedContextPtr = sharedContext == null
-        ? nullptr
-        : Pointer<Void>.fromAddress(sharedContext);
-
-    _viewer = ThermionViewerFFI(
-        resourceLoader: resourceLoader,
-        renderCallback: renderCallback,
-        renderCallbackOwner: renderCallbackOwner,
-        driver: driverPtr,
-        sharedContext: sharedContextPtr,
-        uberArchivePath: uberarchivePath);
-    await _viewer!.initialized;
-    return _viewer!;
-  }
-
-  bool _creatingTexture = false;
-  bool _destroyingTexture = false;
-
-  Future _waitForTextureCreationToComplete() async {
-    var iter = 0;
-
-    while (_creatingTexture || _destroyingTexture) {
-      await Future.delayed(Duration(milliseconds: 50));
-      iter++;
-      if (iter > 10) {
-        throw Exception(
-            "Previous call to createTexture failed to complete within 500ms");
-      }
-    }
-  }
-
-  ///
-  /// Create a backing surface for rendering.
-  /// This is called by [ThermionWidget]; don't call this yourself.
-  ///
-  /// The name here is slightly misleading because we only create
-  /// a texture render target on macOS and iOS; on Android, we render into
-  /// a native window derived from a Surface, and on Windows we render into
-  /// a HWND.
-  ///
-  /// Currently, this only supports a single "texture" (aka rendering surface)
-  /// at any given time. If a [ThermionWidget] is disposed, it will call
-  /// [destroyTexture]; if it is resized, it will call [resizeTexture].
-  ///
-  /// In future, we probably want to be able to create multiple distinct
-  /// textures/render targets. This would make it possible to have multiple
-  /// Flutter Texture widgets, each with its own Filament View attached.
-  /// The current design doesn't accommodate this (for example, it seems we can
-  /// only create a single native window from a Surface at any one time).
-  ///
-  Future<ThermionFlutterTexture?> createTexture(double width, double height,
-      double offsetLeft, double offsetRight, double pixelRatio) async {
-    final physicalWidth = (width * pixelRatio).ceil();
-    final physicalHeight = (height * pixelRatio).ceil();
-    // when a ThermionWidget is inserted, disposed then immediately reinserted
-    // into the widget hierarchy (e.g. rebuilding due to setState(() {}) being called in an ancestor widget)
-    // the first call to createTexture may not have completed before the second.
-    // add a loop here to wait (max 500ms) for the first call to complete
-    await _waitForTextureCreationToComplete();
-
-    // note that when [ThermionWidget] is disposed, we don't destroy the
-    // texture; instead, we keep it around in case a subsequent call requests
-    // a texture of the same size.
-
-    if (_textures.length > 1) {
-      throw Exception("Multiple textures not yet supported");
-    } else if (_textures.length == 1) {
-      if (_textures.first.height == physicalHeight &&
-          _textures.first.width == physicalWidth) {
-        return _textures.first;
-      } else {
-        await _viewer!.setRendering(false);
-        await _swapChain?.destroy();
-        await destroyTexture(_textures.first);
-        _textures.clear();
-      }
-    }
-
-    _creatingTexture = true;
-
-    var result = await _channel.invokeMethod("createTexture",
-        [physicalWidth, physicalHeight, offsetLeft, offsetLeft]);
-
-    if (result == null || (result[0] == -1)) {
-      throw Exception("Failed to create texture");
-    }
-    final flutterTextureId = result[0] as int?;
-    final hardwareTextureId = result[1] as int?;
-    final surfaceAddress = result[2] as int?;
-
-    _logger.info(
-        "Created texture with flutter texture id ${flutterTextureId}, hardwareTextureId $hardwareTextureId and surfaceAddress $surfaceAddress");
-
-    _viewer?.viewportDimensions =
-        (physicalWidth.toDouble(), physicalHeight.toDouble());
-
-    final texture = ThermionFlutterTexture(flutterTextureId, hardwareTextureId,
-        physicalWidth, physicalHeight, surfaceAddress);
-
-    await _viewer?.createSwapChain(physicalWidth, physicalHeight,
-        surface: texture.surfaceAddress == null
-            ? nullptr
-            : Pointer<Void>.fromAddress(texture.surfaceAddress!));
-
-    if (texture.hardwareTextureId != null) {
-      if (_renderTarget != null) {
-        await _renderTarget!.destroy();
-      }
-      // ignore: unused_local_variable
-      _renderTarget = await _viewer?.createRenderTarget(
-          physicalWidth,
-          physicalHeight,
-          texture.hardwareTextureId!);
-    }
-
-    await _viewer?.updateViewportAndCameraProjection(
-        physicalWidth.toDouble(), physicalHeight.toDouble());
-    _creatingTexture = false;
-    _textures.add(texture);
-    return texture;
-  }
-
-  ///
-  /// Destroy a texture and clean up the texture cache (if applicable).
-  ///
-  Future destroyTexture(ThermionFlutterTexture texture) async {
-    if (_creatingTexture || _destroyingTexture) {
-      throw Exception(
-          "Cannot destroy texture while concurrent call to createTexture/destroyTexture has not completed");
-    }
-    _destroyingTexture = true;
-    _textures.remove(texture);
-    await _channel.invokeMethod("destroyTexture", texture.flutterTextureId);
-    _destroyingTexture = false;
-  }
-
-  bool _resizing = false;
-
-  ///
-  /// Called by [ThermionWidget] to resize a texture. Don't call this yourself.
-  ///
-  @override
-  Future<ThermionFlutterTexture?> resizeTexture(
-      ThermionFlutterTexture texture,
-      int width,
-      int height,
-      int offsetLeft,
-      int offsetTop,
-      double pixelRatio) async {
-    if (_resizing) {
-      throw Exception("Resize underway");
-    }
-
-    width = (width * pixelRatio).ceil();
-    height = (height * pixelRatio).ceil();
-
-    if ((width - _viewer!.viewportDimensions.$1).abs() < 0.001 ||
-        (height - _viewer!.viewportDimensions.$2).abs() < 0.001) {
-      return texture;
-    }
-    _resizing = true;
-    bool wasRendering = _viewer!.rendering;
-    await _viewer!.setRendering(false);
-    await _swapChain?.destroy();
-    await destroyTexture(texture);
-
-    var result = await _channel
-        .invokeMethod("createTexture", [width, height, offsetLeft, offsetLeft]);
-
-    if (result == null || result[0] == -1) {
-      throw Exception("Failed to create texture");
-    }
-    _viewer!.viewportDimensions = (width.toDouble(), height.toDouble());
-    var newTexture =
-        ThermionFlutterTexture(result[0], result[1], width, height, result[2]);
-
-    await _viewer!.createSwapChain(width, height,
-        surface: newTexture.surfaceAddress == null
-            ? nullptr
-            : Pointer<Void>.fromAddress(newTexture.surfaceAddress!));
-
-    if (newTexture.hardwareTextureId != null) {
-      // ignore: unused_local_variable
-      var renderTarget = await _viewer!.createRenderTarget(
-          width, height, newTexture.hardwareTextureId!);
-    }
-    await _viewer!
-        .updateViewportAndCameraProjection(width.toDouble(), height.toDouble());
-
-    _viewer!.viewportDimensions = (width.toDouble(), height.toDouble());
-    if (wasRendering) {
-      await _viewer!.setRendering(true);
-    }
-    _textures.add(newTexture);
-    _resizing = false;
-    return newTexture;
-  }
-}

thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_ios.dart

@@ -0,0 +1,131 @@
+import 'dart:async';
+import 'package:flutter/services.dart';
+import 'dart:ffi';
+import 'package:thermion_dart/thermion_dart.dart';
+import 'package:thermion_dart/src/viewer/src/ffi/thermion_viewer_ffi.dart';
+import 'package:thermion_flutter_ffi/thermion_flutter_method_channel_interface.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_platform_interface.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
+import 'package:logging/logging.dart';
+
+///
+/// An implementation of [ThermionFlutterPlatform] that uses
+/// Flutter platform channels to create a rendering context,
+/// resource loaders, and surface/render target(s).
+///
+class ThermionFlutterIOS
+    extends ThermionFlutterMethodChannelInterface {
+  final _channel = const MethodChannel("dev.thermion.flutter/event");
+  final _logger = Logger("ThermionFlutterFFI");
+
+  ThermionViewerFFI? _viewer;
+
+  ThermionFlutterIOS._() {}
+
+  RenderTarget? _renderTarget;
+  SwapChain? _swapChain;
+
+  static void registerWith() {
+    ThermionFlutterPlatform.instance = ThermionFlutterIOS._();
+  }
+
+  final _textures = <ThermionFlutterTexture>{};
+
+  bool _creatingTexture = false;
+  bool _destroyingTexture = false;
+
+  bool _resizing = false;
+
+  ///
+  /// Create a rendering surface.
+  ///
+  /// This is internal; unless you are [thermion_*] package developer, don't
+  /// call this yourself.
+  ///
+  /// The name here is slightly misleading because we only create
+  /// a texture render target on macOS and iOS; on Android, we render into
+  /// a native window derived from a Surface, and on Windows we render into
+  /// a HWND.
+  ///
+  /// Currently, this only supports a single "texture" (aka rendering surface)
+  /// at any given time. If a [ThermionWidget] is disposed, it will call
+  /// [destroyTexture]; if it is resized, it will call [resizeTexture].
+  ///
+  /// In future, we probably want to be able to create multiple distinct
+  /// textures/render targets. This would make it possible to have multiple
+  /// Flutter Texture widgets, each with its own Filament View attached.
+  /// The current design doesn't accommodate this (for example, it seems we can
+  /// only create a single native window from a Surface at any one time).
+  ///
+  Future<ThermionFlutterTexture?> createTexture(int width, int height) async {
+    throw Exception("TODO");
+    // note that when [ThermionWidget] is disposed, we don't destroy the
+    // texture; instead, we keep it around in case a subsequent call requests
+    // a texture of the same size.
+
+    // if (_textures.length > 1) {
+    //   throw Exception("Multiple textures not yet supported");
+    // } else if (_textures.length == 1) {
+    //   if (_textures.first.height == physicalHeight &&
+    //       _textures.first.width == physicalWidth) {
+    //     return _textures.first;
+    //   } else {
+    //     await _viewer!.setRendering(false);
+    //     await _swapChain?.destroy();
+    //     await destroyTexture(_textures.first);
+    //     _textures.clear();
+    //   }
+    // }
+
+    // _creatingTexture = true;
+
+    // var result = await _channel.invokeMethod("createTexture",
+    //     [physicalWidth, physicalHeight, offsetLeft, offsetLeft]);
+
+    // if (result == null || (result[0] == -1)) {
+    //   throw Exception("Failed to create texture");
+    // }
+    // final flutterTextureId = result[0] as int?;
+    // final hardwareTextureId = result[1] as int?;
+    // final surfaceAddress = result[2] as int?;
+
+    // _logger.info(
+    //     "Created texture with flutter texture id ${flutterTextureId}, hardwareTextureId $hardwareTextureId and surfaceAddress $surfaceAddress");
+
+    // final texture = ThermionFlutterTexture(flutterTextureId, hardwareTextureId,
+    //     physicalWidth, physicalHeight, surfaceAddress);
+
+    // await _viewer?.createSwapChain(physicalWidth, physicalHeight,
+    //     surface: texture.surfaceAddress == null
+    //         ? nullptr
+    //         : Pointer<Void>.fromAddress(texture.surfaceAddress!));
+
+    // if (texture.hardwareTextureId != null) {
+    //   if (_renderTarget != null) {
+    //     await _renderTarget!.destroy();
+    //   }
+    //   // ignore: unused_local_variable
+    //   _renderTarget = await _viewer?.createRenderTarget(
+    //       physicalWidth, physicalHeight, texture.hardwareTextureId!);
+    // }
+
+    // await _viewer?.updateViewportAndCameraProjection(
+    //     physicalWidth.toDouble(), physicalHeight.toDouble());
+    // _creatingTexture = false;
+    // _textures.add(texture);
+    // return texture;
+  }
+
+  ///
+  /// Called by [ThermionWidget] to resize a texture. Don't call this yourself.
+  ///
+  @override
+  Future resizeWindow(
+    int width,
+    int height,
+    int offsetLeft,
+    int offsetTop,
+  ) async {
+    throw Exception("Not supported on iOS");
+  }
+}

thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_macos.dart

@@ -0,0 +1,77 @@
+import 'dart:async';
+import 'package:flutter/services.dart';
+import 'package:thermion_dart/thermion_dart.dart';
+import 'package:thermion_flutter_ffi/thermion_flutter_method_channel_interface.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_platform_interface.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
+import 'package:logging/logging.dart';
+
+///
+/// An implementation of [ThermionFlutterPlatform] that uses
+/// Flutter platform channels to create a rendering context,
+/// resource loaders, and surface/render target(s).
+///
+class ThermionFlutterMacOS extends ThermionFlutterMethodChannelInterface {
+  final _channel = const MethodChannel("dev.thermion.flutter/event");
+  final _logger = Logger("ThermionFlutterFFI");
+
+  SwapChain? _swapChain;
+
+  ThermionFlutterMacOS._() {}
+
+  static void registerWith() {
+    ThermionFlutterPlatform.instance = ThermionFlutterMacOS._();
+  }
+
+  // On desktop platforms, textures are always created
+  Future<ThermionFlutterTexture?> createTexture(int width, int height) async {
+    if (_swapChain == null) {
+      // this is the headless swap chain
+      // since we will be using render targets, the actual dimensions don't matter
+      _swapChain = await viewer!.createSwapChain(width, height);
+    }
+    // Get screen width and height
+    int screenWidth = width; //1920;
+    int screenHeight = height; //1080;
+
+    if (width > screenWidth || height > screenHeight) {
+      throw Exception("TODO - unsupported");
+    }
+
+    var result = await _channel
+        .invokeMethod("createTexture", [screenWidth, screenHeight, 0, 0]);
+
+    if (result == null || (result[0] == -1)) {
+      throw Exception("Failed to create texture");
+    }
+    final flutterTextureId = result[0] as int?;
+    final hardwareTextureId = result[1] as int?;
+    final surfaceAddress = result[2] as int?;
+    
+
+    _logger.info(
+        "Created texture with flutter texture id ${flutterTextureId}, hardwareTextureId $hardwareTextureId and surfaceAddress $surfaceAddress");
+
+    return MacOSMethodChannelFlutterTexture(_channel, flutterTextureId!,
+        hardwareTextureId!, screenWidth, screenHeight);
+  }
+
+  // On MacOS, we currently use textures/render targets, so there's no window to resize
+  @override
+  Future<ThermionFlutterTexture?> resizeWindow(
+      int width, int height, int offsetTop, int offsetRight) {
+    throw UnimplementedError();
+  }
+}
+
+class MacOSMethodChannelFlutterTexture extends MethodChannelFlutterTexture {
+  MacOSMethodChannelFlutterTexture(super.channel, super.flutterId,
+      super.hardwareId, super.width, super.height);
+
+  @override
+  Future resize(int width, int height, int left, int top) async {
+    if (width > this.width || height > this.height || left != 0 || top != 0) {
+      throw Exception();
+    }
+  }
+}

thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_method_channel_interface.dart

@@ -0,0 +1,86 @@
+import 'dart:async';
+import 'package:flutter/services.dart';
+import 'dart:ffi';
+import 'package:thermion_dart/thermion_dart.dart';
+import 'package:thermion_dart/src/viewer/src/ffi/thermion_viewer_ffi.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_platform_interface.dart';
+import 'package:logging/logging.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
+
+///
+/// An abstract implementation of [ThermionFlutterPlatform] that uses
+/// Flutter platform channels to create a rendering context,
+/// resource loaders, and surface/render target(s).
+///
+abstract class ThermionFlutterMethodChannelInterface
+    extends ThermionFlutterPlatform {
+  final _channel = const MethodChannel("dev.thermion.flutter/event");
+  final _logger = Logger("ThermionFlutterMethodChannelInterface");
+
+  ThermionViewerFFI? viewer;
+
+  Future<ThermionViewer> createViewer({ThermionFlutterOptions? options}) async {
+    if (viewer != null) {
+      throw Exception(
+          "Only one viewer can be created over the lifetime of an application");
+    }
+
+    var resourceLoader = Pointer<Void>.fromAddress(
+        await _channel.invokeMethod("getResourceLoaderWrapper"));
+
+    if (resourceLoader == nullptr) {
+      throw Exception("Failed to get resource loader");
+    }
+    
+    var renderCallback = nullptr;
+    var renderCallbackOwner = nullptr;
+
+    var driverPlatform = await _channel.invokeMethod("getDriverPlatform");
+    var driverPtr = driverPlatform == null
+        ? nullptr
+        : Pointer<Void>.fromAddress(driverPlatform);
+
+    var sharedContext = await _channel.invokeMethod("getSharedContext");
+
+    var sharedContextPtr = sharedContext == null
+        ? nullptr
+        : Pointer<Void>.fromAddress(sharedContext);
+
+    viewer = ThermionViewerFFI(
+        resourceLoader: resourceLoader,
+        renderCallback: renderCallback,
+        renderCallbackOwner: renderCallbackOwner,
+        driver: driverPtr,
+        sharedContext: sharedContextPtr,
+        uberArchivePath: options?.uberarchivePath);
+    await viewer!.initialized;
+    return viewer!;
+  }
+}
+
+abstract class MethodChannelFlutterTexture extends ThermionFlutterTexture {
+  final MethodChannel _channel;
+
+  MethodChannelFlutterTexture(
+      this._channel, this.flutterId, this.hardwareId, this.width, this.height);
+
+  Future destroy() async {
+    await _channel.invokeMethod("destroyTexture", hardwareId);
+  }
+
+  @override
+  final int flutterId;
+
+  @override
+  final int hardwareId;
+
+  @override
+  final int height;
+
+  @override
+  final int width;
+
+  Future markFrameAvailable() async {
+    await _channel.invokeMethod("markTextureFrameAvailable", this.flutterId);
+  }
+}

thermion_flutter/thermion_flutter_ffi/lib/thermion_flutter_windows.dart

@@ -0,0 +1,97 @@
+import 'dart:async';
+import 'package:flutter/services.dart';
+import 'dart:ffi';
+import 'package:thermion_dart/thermion_dart.dart';
+import 'package:thermion_dart/src/viewer/src/ffi/thermion_viewer_ffi.dart';
+import 'package:thermion_flutter_ffi/thermion_flutter_method_channel_interface.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_platform_interface.dart';
+import 'package:thermion_flutter_platform_interface/thermion_flutter_texture.dart';
+import 'package:logging/logging.dart';
+
+///
+/// An implementation of [ThermionFlutterPlatform] that uses
+/// Flutter platform channels to create a rendering context,
+/// resource loaders, and surface/render target(s).
+///
+class ThermionFlutterWindows
+    extends ThermionFlutterMethodChannelInterface {
+  final _channel = const MethodChannel("dev.thermion.flutter/event");
+
+  final _logger = Logger("ThermionFlutterWindows");
+
+  ThermionViewerFFI? _viewer;
+
+  ThermionFlutterWindows._() {}
+
+  SwapChain? _swapChain;
+
+  static void registerWith() {
+    ThermionFlutterPlatform.instance = ThermionFlutterWindows._();
+  }
+
+  ///
+  /// Not supported on Windows. Throws an exception.
+  ///
+  Future<ThermionFlutterTexture?> createTexture(int width, int height) async {
+    throw Exception("Texture not supported on Windows");
+  }
+
+  bool _resizing = false;
+
+  ///
+  /// Called by [ThermionWidget] to resize a texture. Don't call this yourself.
+  ///
+  @override
+  Future resizeWindow(
+      int width, int height, int offsetLeft, int offsetTop) async {
+    if (_resizing) {
+      throw Exception("Resize underway");
+    }
+
+    throw Exception("TODO");
+
+    // final view = await this._viewer!.getViewAt(0);
+    // final viewport = await view.getViewport();
+    // final swapChain = await this._viewer.getSwapChainAt(0);
+
+    // if (width == viewport.width && height - viewport.height == 0) {
+    //   return;
+    // }
+
+    // _resizing = true;
+    // bool wasRendering = _viewer!.rendering;
+    // await _viewer!.setRendering(false);
+    // await _swapChain?.destroy();
+
+    // var result = await _channel
+    //     .invokeMethod("createTexture", [width, height, offsetLeft, offsetLeft]);
+
+    // if (result == null || result[0] == -1) {
+    //   throw Exception("Failed to create texture");
+    // }
+
+    // var newTexture =
+    //     ThermionFlutterTexture(result[0], result[1], width, height, result[2]);
+
+    // await _viewer!.createSwapChain(width, height,
+    //     surface: newTexture.surfaceAddress == null
+    //         ? nullptr
+    //         : Pointer<Void>.fromAddress(newTexture.surfaceAddress!));
+
+    // if (newTexture.hardwareTextureId != null) {
+    //   // ignore: unused_local_variable
+    //   var renderTarget = await _viewer!
+    //       .createRenderTarget(width, height, newTexture.hardwareTextureId!);
+    // }
+
+    // await _viewer!
+    //     .updateViewportAndCameraProjection(width.toDouble(), height.toDouble());
+
+    // if (wasRendering) {
+    //   await _viewer!.setRendering(true);
+    // }
+    // _textures.add(newTexture);
+    // _resizing = false;
+    // return newTexture;
+  }
+}

thermion_flutter/thermion_flutter_ffi/pubspec.yaml

@@ -11,13 +11,13 @@ flutter:
     implements: thermion_flutter_platform_interface
     platforms:
       ios:
-        dartPluginClass: ThermionFlutterFFI
+        dartPluginClass: ThermionFlutterIOS
       android:
-        dartPluginClass: ThermionFlutterFFI
+        dartPluginClass: ThermionFlutterAndroid
       macos:
-        dartPluginClass: ThermionFlutterFFI
+        dartPluginClass: ThermionFlutterMacOS
       windows:
-        dartPluginClass: ThermionFlutterFFI
+        dartPluginClass: ThermionFlutterWindows
 dependencies:
   flutter:
     sdk: flutter

thermion_flutter/thermion_flutter_platform_interface/lib/thermion_flutter_platform_interface.dart

@@ -9,7 +9,6 @@ class ThermionFlutterOptions {
 
   ThermionFlutterOptions({this.uberarchivePath});
   const ThermionFlutterOptions.empty() : uberarchivePath = null;
-
 }
 
 abstract class ThermionFlutterPlatform extends PlatformInterface {
@@ -25,17 +24,23 @@ abstract class ThermionFlutterPlatform extends PlatformInterface {
     _instance = instance;
   }
 
-  Future<ThermionViewer> createViewerWithOptions(
+  ///
-      covariant ThermionFlutterOptions options);
+  ///
+  ///
+  Future<ThermionViewer> createViewer(
+      {covariant ThermionFlutterOptions? options});
 
-  @deprecated
+  ///
-  Future<ThermionViewer> createViewer({String? uberarchivePath});
+  /// Create a rendering surface.
+  ///
+  /// This is internal; unless you are [thermion_*] package developer, don't
+  /// call this yourself. May not be supported on all platforms.
+  ///
+  Future<ThermionFlutterTexture?> createTexture(int width, int height);
 
-  Future<ThermionFlutterTexture?> createTexture(double width, double height,
+  ///
-      double offsetLeft, double offsetTop, double pixelRatio);
+  ///
-
+  ///
-  Future destroyTexture(ThermionFlutterTexture texture);
+  Future resizeWindow(
-
+      int width, int height, int offsetTop, int offsetRight);
-  Future<ThermionFlutterTexture?> resizeTexture(ThermionFlutterTexture texture,
-      int width, int height, int offsetTop, int offsetRight, double pixelRatio);
 }

thermion_flutter/thermion_flutter_platform_interface/lib/thermion_flutter_texture.dart

@@ -1,13 +1,30 @@
-class ThermionFlutterTexture {
+// class ThermionFlutterTextureImpl {
-  final int width;
+//   final int width;
-  final int height;
+//   final int height;
-  final int? flutterTextureId;
+//   final int? flutterTextureId;
-  final int? hardwareTextureId;
+//   final int? hardwareTextureId;
-  final int? surfaceAddress;
+//   final int? surfaceAddress;
-  bool get usesBackingWindow => flutterTextureId == null;
+//   bool get usesBackingWindow => flutterTextureId == null;
 
-  ThermionFlutterTexture(this.flutterTextureId, this.hardwareTextureId,
+//   ThermionFlutterTexture(this.flutterTextureId, this.hardwareTextureId,
-      this.width, this.height, this.surfaceAddress) {
+//       this.width, this.height, this.surfaceAddress) {
 
-  }
+//   }
+// }
+
+abstract class ThermionFlutterTexture {
+  int get width;
+  int get height;
+
+  int get flutterId;
+  int get hardwareId;
+
+  ///
+  /// Destroy a texture and clean up the texture cache (if applicable).
+  ///
+  Future destroy();
+
+  Future resize(int width, int height, int left, int top);
+
+  Future markFrameAvailable();
 }