hole.glsl

# ----- Given this shader

vec4 some_noise_fn() {
    return vec4(1.0, 2.0, 3.0, 4.0);
}

void main() {
    return some_noise_fn();
}

# ---- I want to replace some_noise_fn() with another function, so my shader author can
       experiment generating different types of visual noise. Let's say it's:

vec4 other_noise_fn() {
    return vec4(5.0, 5.0, 5.0, 5.0);
}

# ---- Here's what the final progam looks like with the function replaced (the hole filled)

vec4 some_noise_fn() {
    return vec4(5.0, 5.0, 5.0, 5.0);
}

void main() {
    return some_noise_fn();
}