Pass screen resolution to shader OpenGL. Making UV's for quad frag shader

[ArcAudio]

That’s a good idea. No idea how to build one. Just trying the best I can to mimic the inputs of shadertoy, like iTime.

Nearly figured out the mouse as well:

Juce Shader Mouse interaction

Except I’m not getting screen/canvas co-ords with relativeXY, I need getScreenPosition() from the mouse, but I don’t know how to return it.