[Shader]水面深度计算_water shader

Shader "Unlit/WaterDepth"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _DepthScale("DepthScale",Range(1,1000)) = 1
    }
    SubShader
    {
        Tags { "Queue"="Transparent" }
 
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
 
            #include "UnityCG.cginc"
 
            struct MeshData
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };
 
            struct Interpolators
            {
                float2 uv : TEXCOORD0;
                float4 posCS : SV_POSITION;
                float3 posVS : TEXCOORD1;
            };
 
            sampler2D _MainTex;
            float4 _MainTex_ST;
            sampler2D _CameraDepthTexture;
            float _DepthScale;
 
            Interpolators vert (MeshData v)
            {
                Interpolators o;
                o.posVS = UnityObjectToViewPos(v.vertex);
                o.posCS = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                return o;
            }
 
            float4 frag (Interpolators i) : SV_Target
            {
                float2 uvScreen = i.posCS.xy / _ScreenParams.xy;
                float depth = tex2D(_CameraDepthTexture,uvScreen) * _DepthScale;
                depth = LinearEyeDepth(depth);
                depth = depth + i.posVS.z;
                return depth;
            }
            ENDCG
        }
    }
    Fallback "Diffuse"
}