How to generate simplex noise in shader?

Question

Everywhere I look I see posts on how to generate opensimplex noise within GDScript, but I can't find any on how to generate that noise in a fragment shader. Can anybody help me out?

I would love if somebody could provide just a simple grayscale noise shader using the build in noise function.

Answer 1

Ok, figured it out myself. You have to create a texture uniform, and then in the node inspector you set that to a new noise texture

uniform sampler2D NOISE_PATTERN;

void fragment(){
    float noiseValue = texture(NOISE_PATTERN, UV).x;
    COLOR = vec4(noiseValue);
}

The above will simply sample the noise texture and set the color as the output