From 353b33b7c33e5b4a0a2c2f954869b449f45dc2fc Mon Sep 17 00:00:00 2001
From: Nick Fisher <nick.fisher@avinium.com>
Date: Mon, 7 Jul 2025 17:37:28 +0800
Subject: [PATCH] fix: addDestroySwapchain argument to createViewer() (true by
 default). This is only used on iOS/macOS where a single swapchain is shared
 between all render targets

---
 .../lib/src/thermion_flutter_plugin.dart         |  4 ++--
 ...thermion_flutter_method_channel_platform.dart | 16 ++++++++++------
 .../lib/thermion_flutter_platform_interface.dart |  2 +-
 3 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/thermion_flutter/thermion_flutter/lib/src/thermion_flutter_plugin.dart b/thermion_flutter/thermion_flutter/lib/src/thermion_flutter_plugin.dart
index 94dcb077..7d40b4c7 100644
--- a/thermion_flutter/thermion_flutter/lib/src/thermion_flutter_plugin.dart
+++ b/thermion_flutter/thermion_flutter/lib/src/thermion_flutter_plugin.dart
@@ -11,8 +11,8 @@ import 'package:thermion_flutter_platform_interface/thermion_flutter_platform_in
 class ThermionFlutterPlugin {
   ThermionFlutterPlugin._();
 
-  static Future<ThermionViewer> createViewer() {
-    return ThermionFlutterPlatform.instance.createViewer();
+  static Future<ThermionViewer> createViewer({bool destroySwapchain = true}) {
+    return ThermionFlutterPlatform.instance.createViewer(destroySwapchain: destroySwapchain);
   }
 
 }
diff --git a/thermion_flutter/thermion_flutter_method_channel/lib/src/thermion_flutter_method_channel_platform.dart b/thermion_flutter/thermion_flutter_method_channel/lib/src/thermion_flutter_method_channel_platform.dart
index bc058eca..6412f69d 100644
--- a/thermion_flutter/thermion_flutter_method_channel/lib/src/thermion_flutter_method_channel_platform.dart
+++ b/thermion_flutter/thermion_flutter_method_channel/lib/src/thermion_flutter_method_channel_platform.dart
@@ -46,7 +46,7 @@ class ThermionFlutterMethodChannelPlatform extends ThermionFlutterPlatform {
     return asset.buffer.asUint8List(asset.offsetInBytes);
   }
 
-  Future<ThermionViewer> createViewer() async {
+  Future<ThermionViewer> createViewer({bool destroySwapchain = true}) async {
     var driverPlatform = await channel.invokeMethod("getDriverPlatform");
 
     var platformPtr = driverPlatform == null
@@ -118,7 +118,13 @@ class ThermionFlutterMethodChannelPlatform extends ThermionFlutterPlatform {
     // TODO - see if we can use `renderStandaloneView` in FilamentViewer to
     // avoid this
     if (Platform.isMacOS || Platform.isIOS) {
-      _swapChain = await FilamentApp.instance!.createHeadlessSwapChain(1, 1, hasStencilBuffer: true);
+      if(destroySwapchain && _swapChain != null) {
+        await FilamentApp.instance!.destroySwapChain(_swapChain!);
+        _swapChain = null;
+      }
+
+      _swapChain ??= await FilamentApp.instance!
+          .createHeadlessSwapChain(1, 1, hasStencilBuffer: true);
       await FilamentApp.instance!.register(_swapChain!, viewer.view);
       await viewer.view.setRenderable(true);
     }
@@ -179,10 +185,8 @@ class ThermionFlutterMethodChannelPlatform extends ThermionFlutterPlatform {
       }
 
       _swapChain = await FilamentApp.instance!.createHeadlessSwapChain(
-        descriptor.width,
-        descriptor.height,
-        hasStencilBuffer: true
-      );
+          descriptor.width, descriptor.height,
+          hasStencilBuffer: true);
 
       _logger.info(
         "Created headless swapchain ${descriptor.width}x${descriptor.height}",
diff --git a/thermion_flutter/thermion_flutter_platform_interface/lib/thermion_flutter_platform_interface.dart b/thermion_flutter/thermion_flutter_platform_interface/lib/thermion_flutter_platform_interface.dart
index c1661467..6a233683 100644
--- a/thermion_flutter/thermion_flutter_platform_interface/lib/thermion_flutter_platform_interface.dart
+++ b/thermion_flutter/thermion_flutter_platform_interface/lib/thermion_flutter_platform_interface.dart
@@ -65,7 +65,7 @@ abstract class ThermionFlutterPlatform extends PlatformInterface {
   ///
   ///
   ///
-  Future<ThermionViewer> createViewer() {
+  Future<ThermionViewer> createViewer({bool destroySwapchain = true}) {
     throw UnimplementedError();
   }