add RenderTarget_destroyRenderThread

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

@@ -1,5 +1,3 @@
-import 'dart:ffi';
-
 import 'package:thermion_dart/src/viewer/src/ffi/src/callbacks.dart';
 import 'package:thermion_dart/src/viewer/src/ffi/src/ffi_filament_app.dart';
 import 'package:thermion_dart/src/viewer/src/ffi/src/ffi_texture.dart';
@@ -25,6 +23,6 @@ class FFIRenderTarget extends RenderTarget {
   
   @override
   Future destroy() async {
-    await withVoidCallback((cb) => RenderTarget_destroy(app.engine, renderTarget));
+    await withVoidCallback((cb) => RenderTarget_destroyRenderThread(app.engine, renderTarget, cb));
   }
 }

thermion_dart/native/include/c_api/ThermionDartRenderThreadApi.h

@@ -186,6 +186,12 @@ namespace thermion
             TTexture *depth,
             void (*onComplete)(TRenderTarget *)
         );
+        EMSCRIPTEN_KEEPALIVE void RenderTarget_destroyRenderThread(
+            TEngine *tEngine,
+            TRenderTarget *tRenderTarget,
+            void (*onComplete)()
+        );
+
 
         // TextureSampler methods
         EMSCRIPTEN_KEEPALIVE void TextureSampler_createRenderThread(void (*onComplete)(TTextureSampler*));

thermion_dart/native/src/c_api/ThermionDartRenderThreadApi.cpp

@@ -784,7 +784,19 @@ EMSCRIPTEN_KEEPALIVE void SceneAsset_createFromFilamentAssetRenderThread(
     auto fut = _renderThread->add_task(lambda);
   }
 
-  
+  EMSCRIPTEN_KEEPALIVE void RenderTarget_destroyRenderThread(
+    TEngine *tEngine,
+    TRenderTarget *tRenderTarget,
+    void (*onComplete)()
+  ) {
+    std::packaged_task<void()> lambda(
+        [=]() mutable
+        {
+          RenderTarget_destroy(tEngine, tRenderTarget);
+          onComplete();
+        });
+    auto fut = _renderThread->add_task(lambda);
+  }
 
   
   EMSCRIPTEN_KEEPALIVE void TextureSampler_createRenderThread(void (*onComplete)(TTextureSampler *))