omicron/shaders/sky_fragment.glsl

#version 120

uniform sampler2D sampler;
uniform float timer;
uniform vec3 sky_tint;

varying vec2 fragment_uv;

void main() {
    vec2 uv = vec2(timer, fragment_uv.t);
    gl_FragColor = texture2D(sampler, uv) * vec4(sky_tint, 1.0);
}