SimpleWater.shader

Shader "Unlit/Simple Water"
{
	Properties
	{
		_Color("Tint", Color) = (1, 1, 1, .5)
		_FoamC("Foam", Color) = (1, 1, 1, .5)
		_MainTex ("Main Texture", 2D) = "white" {}
		_TextureDistort("Texture Wobble", range(0,1)) = 0.1
		_NoiseTex("Extra Wave Noise", 2D) = "white" {}
		_Speed("Wave Speed", Range(0,1)) = 0.5
		_Amount("Wave Amount", Range(0,1)) = 0.6
		_Scale("Scale", Range(0,1)) = 0.5
		_Height("Wave Height", Range(0,1)) = 0.1
		_Foam("Foamline Thickness", Range(0,10)) = 8
	}
	SubShader
	{
		Tags { "RenderType"="Opaque"  "Queue" = "Transparent" }
		LOD 100
		Blend OneMinusDstColor One
		Cull Off

		GrabPass{
			Name "BASE"
			Tags{ "LightMode" = "Always" }
				}
		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			// make fog work
			#pragma multi_compile_fog

			#include "UnityCG.cginc"

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

			struct v2f
			{
				float2 uv : TEXCOORD3;
				UNITY_FOG_COORDS(1)
				float4 vertex : SV_POSITION;
				float4 scrPos : TEXCOORD2;//
				float4 worldPos : TEXCOORD4;//
			};
			float _TextureDistort;
			float4 _Color;
			sampler2D _CameraDepthTexture; //Depth Texture
			sampler2D _MainTex, _NoiseTex;//
			float4 _MainTex_ST;
			float _Speed, _Amount, _Height, _Foam, _Scale;//
			float4 _FoamC;

			v2f vert (appdata v)
			{
				v2f o;
				UNITY_INITIALIZE_OUTPUT(v2f, o);
				float4 tex = tex2Dlod(_NoiseTex, float4(v.uv.xy, 0, 0));//extra noise tex
				v.vertex.y += sin(_Time.z * _Speed + (v.vertex.x * v.vertex.z * _Amount * tex)) * _Height;//movement
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.worldPos = mul(unity_ObjectToWorld, v.vertex);

				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				o.scrPos = ComputeScreenPos(o.vertex);
				UNITY_TRANSFER_FOG(o,o.vertex);
				return o;
			}

			fixed4 frag (v2f i) : SV_Target
			{
				// sample the texture
				fixed distortx = tex2D(_NoiseTex, (i.worldPos.xz * _Scale)  + (_Time.x * 2)).r;// distortion alpha

				half4 col = tex2D(_MainTex, (i.worldPos.xz * _Scale) - (distortx * _TextureDistort));// texture times tint;
				half depth = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture, UNITY_PROJ_COORD(i.scrPos ))); // depth
				half4 foamLine =1 - saturate(_Foam* (depth - i.scrPos.w ) ) ;// foam line by comparing depth and screenposition
				col *= _Color;
				col += (step(0.4 * distortx,foamLine) * _FoamC); // add the foam line and tint to the texture
				col = saturate(col) * col.a ;

				return   col;
			}
			ENDCG
		}
	}
}