flutter_opengl 0.0.3

Flutter OpenGL plugin

OpenGL Flutter plugin

OpenGL Android NDK plugin.

YT video

Getting Started

This plugin is only for Android. Is greatly appreciated any help!
This is an early stage of a plugin for Flutter to let the developers to use an OpenGL widget. This is not a binding to let the devs to write OpenGL code within Flutter, but lets to write shader and drawing frame functions in C/C++ code. The plugin is only available for Android OS, looking forward for someone to make it cross-platform!

The example provides 4 drawing shaders classes. They are subclass of Shader.cpp. Each of them need an initShader(void *args) and a drawFrame(void *args) functions which are used by the renderer.cpp engine at creation time. RendererController::nativeSetSurface() has the task to crate the renderer engine.

The 3 example shaders are taken from https://www.shadertoy.com/ https://www.shadertoy.com/view/3l23Rh by nimitz https://www.shadertoy.com/user/nimitz https://www.shadertoy.com/view/llj3Dz by Darthmarshie https://www.shadertoy.com/user/Darthmarshie https://www.shadertoy.com/view/ttlGDf by alro https://www.shadertoy.com/user/alro

(more to come)

ISSUEs:

Currently NDK builds for x86_64, x86, arm64-v8a and armeabi-v7a and libnative-lib.so is available on all ABI lib subfolders but libflutter.so is missing in armeabi-v7a. In example or plugin build.gradle or both, forcing gradle to build only for armeabi-v7a with

ndk {
    abiFilters 'armeabi-v7a'
}

doesn't work and libflutter.so is missing in the lib folder, but works with command line:

flutter run --debug --target-platform android-arm

(more to come)

TODO:

Renderer::getWindowWidth() and Renderer::getWindowHeight() doesn't work correctly:
they are used in Renderer::initializeGL() to set window buffer size with ANativeWindow_setBuffersGeometry(), without it the window surface is not working and nothing is displayed.

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Add source comments.

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Implement a way to pass an OpenGL texture from Flutter to NDK.

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Implement iOS layer plugin.

(more to come)