split D3D/GLES texture creation

thermion_flutter/thermion_flutter_platform_interface/lib/thermion_flutter_platform_interface.dart

@@ -39,7 +39,34 @@ abstract class ThermionFlutterPlatform extends PlatformInterface {
   /// call this yourself. May not be supported on all platforms.
   ///
   Future<ThermionFlutterTexture?> createTexture(
-      t.View view, int width, int height);
+      int width, int height);
+
+  ///
+  ///
+  ///
+  ///
+  Future<ThermionFlutterTexture?> resizeTexture(
+    ThermionFlutterTexture texture, 
+      int width, int height);
+
+  ///
+  ///
+  ///
+  Future destroyTexture(ThermionFlutterTexture texture);
+
+  ///
+  ///
+  ///
+  Future markTextureFrameAvailable(ThermionFlutterTexture texture);
+ 
+  ///
+  /// Binds a rendering surface to the given View.
+  ///
+  /// This is internal; unless you are [thermion_*] package developer, don't
+  /// call this yourself. May not be supported on all platforms.
+  ///
+  Future bind(
+      t.View view, ThermionFlutterTexture texture);
 
   ///
   /// Create a rendering window.

thermion_flutter/thermion_flutter_platform_interface/lib/thermion_flutter_texture.dart

@@ -1,17 +1,13 @@
-abstract class ThermionFlutterTexture {
+class ThermionFlutterTexture {
 
-  int get width;
-  int get height;
+  final int width;
+  final int height;
 
-  int get flutterId;
-  int get hardwareId;
+  final int flutterId;
+  final int hardwareId;
 
-  ///
-  /// Destroy a texture and clean up the texture cache (if applicable).
-  ///
-  Future destroy();
+  final int window;
 
-  Future resize(int width, int height, int left, int top);
+  ThermionFlutterTexture({required this.width, required this.height, required this.flutterId, required this.hardwareId, required this.window});
 
-  Future markFrameAvailable();
 }