Shader "Custom/Waves" {
    Properties {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
        _Amplitude ("Amplitude", Float) = 1
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows
        #pragma target 3.0

        sampler2D _MainTex;

        struct Input {
            float2 uv_MainTex;
        };
        
        half _Glossiness;
        half _Metallic;
        fixed4 _Color;
        float _Amplitude;

        void vert(inout appdata_full vertexData) {
            float3 p = vertexData.vertex.xyz;

            p.y = _Amplitude * sin(p.x);

            vertexData.vertex.xyz = p;
        }

        void vert(inout appdata_full vertexData) {}

        void surf (Input IN, inout SurfaceOutputStandard o) {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}