Techmino/parts/shaders/grad2.glsl

extern float t,h;
vec4 effect(vec4 color,Image tex,vec2 tex_coords,vec2 scr_coords){
	float y=scr_coords.y/h;
	return vec4(
		.8-y*.6,
		.2+y*.4,
		.3+.1*sin(t),
		1.
	);
}