title: flutter: How to use texture on Linux
body: <p>I want to integrate OpenGL in Flutter project. I find <a href="https://api.flutter.dev/flutter/widgets/Texture-class.html" rel="nofollow noreferrer">Texture widget</a> seems to be the answer but all the examples I found is for Android or iOS. I saw <a href="https://github.com/flutter/engine/pull/24916" rel="nofollow noreferrer">texture is supported in Linux engine</a> too. But I can't find any tutorial. Let's say I've create a triangle in native OpenGL C++ code. Flutter texture widget requires a texture ID. How can I bind this ID to OpenGL context so I can display this triangle in texture widget?</p>