How to deal with the more complex Shadertoy shaders?

Question

If we take as an example the following Shadertoy shader we can see that it is made of 3 different files, namely Buffer A, Buffer B, and Image. How would I create something similar in Godot. Do I need to use Sampler2D. If yes, how can I have multiple Sampler2D objects that point at different things? (I made a shader where I use an image texture, but I half understand it for the moment so I am not sure.)

How can I deal with iFrame?

Lastly, in Shadertoy, iChannel0/1/2s are used for a number of things, like sound, images and so on (e.g. line 177 of Buffer B on the shader). Does this fall under my first question, namely just use Sampler2D? In some cases Buffer A/B/C/D are loaded into the iChannels and I am not sure what they are.

Thanks.

Hulbig

Answer 1

Those are texture buffers/samplers.

You should probably go through this page: https://docs.godotengine.org/en/stable/tutorials/shading/migrating_to_godot_shader_language.html

Micaelamicah

Answer 2

AFAICT shadertoy buffers let you do multiple passes - this is IIRC not possible in Godot.

Stomy

Answer 3

Well, to a degree you can render into a viewport then do something to that data in the viewport and output to a 2D canvas object.

Micaelamicah