Shader "Unlit/WaveButton"
{
    Properties
    {
        P1ColorIn("Color1 In", Color) = (1.0, 0.5, 0.0, 1.0)
        P1ColorOut("Color1 Out", Color) = (1.0, 0.0, 0.0, 1.0)
        Amplitude("Amplitudes", Float) = 0.1
        Frequency("Frequencies", Float) = 40
        Shift("Shift", Float) = 0.5
        Scale("Scale", Float) = 0.5
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            // make fog work

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                UNITY_FOG_COORDS(1)
                float4 vertex : SV_POSITION;
            };

            half4 P1ColorIn;
            half4 P1ColorOut;
            half Amplitude;
            half Frequency;

            half Shift;
            half Scale;


            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                //o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                //UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }


            half3 CalcCurve(half2 uv, float amp, float freq, half3 c1, half3 c2)
            {
                float curve = amp * sin((freq * uv.x) + (2.0 * _Time.z));
                float lineAShape = smoothstep(1.0 - clamp(distance(curve + uv.y, 0.5), 0.0, 1.0), 1.0, 0.99);
                return (1.0 - lineAShape) * lerp(c1, c2, lineAShape);
            }

            half3 CalcComplexCurve(half2 uv, half4 amp, half4 freq, half3 c1, half3 c2)
            {
                float curve = amp.x * sin((freq.x * uv.x) + (2.0 * _Time.z));
                curve += amp.y * sin((freq.y * uv.x) + (2.0 * _Time.z));
                curve += amp.z * sin((freq.z * uv.x) + (2.0 * _Time.z));
                curve += amp.w * sin((freq.w * uv.x) + (2.0 * _Time.z));
                float lineAShape = smoothstep(1.0 - clamp(distance(curve + uv.y, 0.5), 0.0, 1.0), 1.0, 0.99);
                return (1.0 - lineAShape) * lerp(c1, c2, lineAShape);
            }


            half4 frag (v2f i) : SV_Target
            {

                half4 col = half4(0,0,0,1);// = tex2D(_MainTex, i.uv);


                float curve = Amplitude * sin(Frequency * (2.0 * _Time.z)) * Scale + Shift;

                if (i.uv.x < curve)
                    col.xyz =  P1ColorIn.xyz;
                return col;
            }




            ENDCG
        }
    }
}