#version 120

uniform float time = 1.0;

void main(void)
{
	const float sinWidth = 0.04;
	const float sinHeight = 0.02;
	const float timeMulti = 3.0;
	float val = (sin(gl_FragCoord.x * sinWidth + time * timeMulti) + sin(gl_FragCoord.y * sinHeight + time * timeMulti)) * 0.3 + 0.5;
	gl_FragColor = vec4(vec3(val), 1.0);
}