Godot 3.1+ very minimal Shadertoy logic with FBO
result 41:58
WARNING: On the video - OLD version that has mistakes!
Updated NEW version Godot project (zip) - https://danilw.github.io/godot-utils-and-other/shadertoy_new_2021/src/Godot_shadertoy_v2new.zip
by mistakes in OLD version I mean - its correct, you can still use this video as example implementation of Shadertoy-like logic. Mistakes may confuse you when you try to copypaste OLD code, new code better to see "correct way".
In the new version correct resize, uniforms, FBO format, new better test shader and all mistakes fixed.
Updated Web Godot build to test https://danilw.github.io/godot-utils-and-other/shadertoy_new_2021/shadertoy.html
Shader that used https://www.shadertoy.com/view/WlcBWr
OLD Project (from video):
(it works, but there are mistakes that may confuse you, I do not recommend using it)
shader that used https://www.shadertoy.com/view/wlX3zn
source https://danilw.github.io/godot-utils-and-other/shadertoy_new_2021/src/Godot_shadertoy_v1.zip
live HTML build https://danilw.github.io/GLSL-howto/Godot_shadertoy/shadertoy.html