shader_type canvas_item;

uniform sampler2D noise;
uniform float threshold : hint_range(0,0.5)= .5;
uniform float strength : hint_range(-0.5,0.5) = 0;
float random (vec2 uv) {
    return fract(sin(dot(uv.xy,
        vec2(12.9898,78.233))) * 43758.5453123);
}

void vertex() {
	// Called for every vertex the material is visible on.
}

void fragment() {
	// Called for every pixel the material is visible on.
	vec2 uv = UV;
	vec2 rv = vec2(mod(TIME, 1.0), uv.y);
	vec4 val = texture(noise, rv);

	uv.x += .01 * (val.x - 0.5) * 2.0;
	float extrema = abs(val.x - 0.5);
	//if(extrema > threshold){
		//uv.x += sign(val.x - 0.5) * mix(0,strength, (extrema) / (.5 - threshold));
	//}
	if(extrema > threshold){
		uv.x -= strength * (val.x - 0.5) * 2.0;
	}
	vec4 col = texture(TEXTURE, uv);
	col.rgb *= COLOR.rgb;
	COLOR = col; //* COLOR;
	//COLOR = val;
}

//void light() {
//	// Called for every pixel for every light affecting the CanvasItem.
//	// Uncomment to replace the default light processing function with this one.
//}