Circuit Function

float remap(float s, float a1, float a2, float b1, float b2)
        {
            return b1 + (s - a1) * (b2 - b1) / (a2 - a1);
        }

fixed4 circuit(fixed2 uv, sampler2D tex, fixed4 color, half delay, half speed, half range, half dir) {
            //half pivot = frac(_Time.y / speed) * _MainTex_ST.x + delay;

            // Goes from 0 to 1 over 1/speed total duration
            half pivot = frac((_Time.y - delay) / speed) * _MainTex_ST.x;

            fixed comp = (dir == 0) ? uv.x : uv.y;
            fixed4 mask = tex2D(tex, uv) * color;

            fixed min = pivot - range;
            fixed max = pivot + range;

            // Ramp color
            fixed2 rampUV = fixed2(remap(comp, min, max, 0, 1), 0);
            fixed4 rampColor = tex2D(_ColorRamp, rampUV * _ColorRamp_ST.xy);
            mask *= rampColor.r;

            if (comp >= pivot - range && comp <= pivot + range)
                return mask;

            if (pivot + range > 1.0)
                if (comp >= pivot - range || comp <= pivot + range - 1.0)
                    return mask;

            if (pivot - range < 0)
                if (comp >= pivot - range + 1.0 || comp <= pivot + range)
                    return mask;

            return fixed4(0, 0, 0, 0);
        }