You see, I have this shader that's supposed to render as a rainbow tail for a powerup in my game. It looks fine GLES 3.0,
but all the colour is lost when running with GLES 2.0.
I can't seem to find what's causing the difference, so I'm hoping someone here in this q&a
site can help me out with this dilemma.
Here's the shader code.
I have asked this question in the Godot forums too.