Possible to use GL shaders?

[Zellyn]

Hi folks,

I'm considering porting the OpenEmulator Apple II emulator to something cross-platform. However, the (amazingly excellent) CRT emulation uses an OpenGL shader to do its work. Is it possible to do that in Flutter?

Thanks,

Zellyn

[Matej The Tree]

I dont know the answer, but I would like to be notified on this project. :) 

https://github.com/flutter/flutter/issues/179

https://github.com/flutter/flutter/issues/14591

check this issues though

[Mikkel Ravn]

The Texture widget supports custom OpenGL rendering. We currently don't have an example, but you should be able to find inspiration in the iOS portions of the video_player and camera plugins.

The approach would be to

1. Create a Flutter plugin whose iOS portion registers a FlutterTexture (a protocol you implement) with the FlutterTextureRegistry. That registry is available from the FlutterPluginRegistrar that your plugin is given on initialization.
2. Presumably you set up a thread to do the custom rendering. Whenever a new frame is available, you dispatch a call to FlutterTextureRegistry::textureFrameAvailable on the main dispatch queue, providing the unique ID you got back on registration.
3. Your FlutterTexture implementation should be prepared for calls to copyPixelBuffer where you return a CVPixelBufferRef to the texture you've drawn. Flutter will then ask Skia to render the pixel buffer on the rectangle that the Texture widget occupies within the Flutter layout.

Hope this helps.

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Mikkel Nygaard Ravn

Software Engineer

[Zellyn]

That sounds promising! Does it work on Android, on the Web, in Linux, Mac OS and Windows? The main purpose of using Flutter for me would be the cross-platform functionality.

Zellyn

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[Mikkel Ravn]

The current focus of the Flutter project is iOS and Android.

However, the Flutter engine has embedder APIs that allows it to be ported to many platforms. You may want to monitor this thread for desktop ports.

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