Use shadertoy.com shader?

[f1vefour]

I'm trying to use the heartfelt shader but I can't get it to work correctly.

https://www.shadertoy.com/view/ltffzl

I have the glsl code in a file and selected in shadertoy add-on, I changed the code so the background image is iChannel1, set a background image to iChannel1 in shadertoy add-on settings but when I attempt to preview I get a black screen.

Am I doing something wrong?

[AlwinEsch]

Also by me it brings a bit wrong, the image is upsidedown and the fog comes as blue:

The Image used by the shadertoy link is the tex04.png within addon.

Hope to become soon time to look what exact goes wrong. Has you used addon by you as "GL" or as "GLES"?
Can also currently only test by "GL", but shadertoy primary designed for "GLES", not that this creates the problems.

[f1vefour]

I gave up on shadertoy altogether, running CoreELEC on Odroid N2+ it's broken.

The visualizations start out fine but after a couple of seconds they start getting blocky and this continues until they look terrible.