This project ports some music visulization shaders from WebGL([Shadertoy.com](https://www.shadertoy.com/)) to Android OpenGL ES. It captures the audio data (such as fft & waveform) by system's [`Visualizer`](https://developer.android.com/reference/android/media/audiofx/Visualizer.html), and then pass them to a 2-line texture that can be used in a shader program ([more detail](https://forum.openframeworks.cc/t/passing-fft-audio-data-into-a-shader-as-a-texture2d-object-shadertoy/13756)).
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