Shader "Custom/WaterSimple" {
	Properties {
		_MainTex ("Base (RGB)", 2D) = "white" {}
		_NormalMap ("Normal map", 2D) = "bump" {}
		_Bumpiness ("Bumpiness", Float) = 1.0
		_Shininess ("Specular Shininess", Float) = 0.078125
		_Gloss ("Specular Gloss", Float) = 0.078125
		_Fresnel("Fresnel Coef.", Float) = 0.35
		_SpecColor ("Spec Color", Color) = (1.0,1.0,1.0,1.0)
		_WorldS("World Scale", Float) = 1.0
		_Opacity("Opacity", Float) = 0.5
		_Scroll("Scroll", Vector) = (0,0,0,0)
	}
	SubShader {
	Blend SrcAlpha OneMinusSrcAlpha
		Tags { "RenderType"="Transparent" "Queue"="Transparent"}
		LOD 200
		
		CGPROGRAM
		#pragma surface surf BlinnPhong
		#pragma target 3.0
		sampler2D _MainTex;
		sampler2D _NormalMap;
		float _Bumpiness;
		float _Shininess;
		float _Gloss;
		float _Fresnel;
		float _WorldS;
		float _Opacity;
		float4 _Scroll;

		struct Input {
			float2 uv_MainTex;
			float3 worldPos;
		};

		void surf (Input IN, inout SurfaceOutput o) {
			half4 c = tex2D (_MainTex, IN.uv_MainTex);
			o.Albedo = c.rgb;
			o.Alpha = c.a;
			
			float2 uvSrc = IN.worldPos.xz * _WorldS;
			float2 uv1 = uvSrc + _Time.y * _Scroll.xy;
			float2 uv2 = uvSrc + _Time.y * _Scroll.zw;
			
			float3 nm1 = UnpackNormal (tex2D (_NormalMap, uv1));
			float3 nm2 = UnpackNormal (tex2D (_NormalMap, uv2));
			float3 nm3 = (nm1 + nm2) * 0.5f;
			
			
			float3 nm = lerp(float3(0,0,1), nm3, _Bumpiness);
			o.Normal = nm;
			o.Gloss = _Gloss;
			o.Specular = _Shininess;
			o.Alpha =_Opacity;
		}
		ENDCG
	} 
	FallBack "Diffuse"
}