同步最新svn内容

leonard Wu

2018-08-09 a10eea6e4ce647061813519d5b0ea496f29495b9

 Assets/Plugins/PostProcessing/Resources/Shaders/Fog.shader

@@ -1,109 +1,109 @@
Shader "Hidden/Post FX/Fog"
{
    Properties
    {
        _MainTex("Main Texture", 2D) = "white" {}
    }

    CGINCLUDE

        #pragma multi_compile __ FOG_LINEAR FOG_EXP FOG_EXP2
        #include "UnityCG.cginc"
        #include "Common.cginc"

        #define SKYBOX_THREASHOLD_VALUE 0.9999

        struct Varyings
        {
            float2 uv : TEXCOORD0;
            float4 vertex : SV_POSITION;
        };

        Varyings VertFog(AttributesDefault v)
        {
            Varyings o;
            o.vertex = UnityObjectToClipPos(v.vertex);
            o.uv = UnityStereoScreenSpaceUVAdjust(v.texcoord, _MainTex_ST);
            return o;
        }

        sampler2D _CameraDepthTexture;

        half4 _FogColor;
        float _Density;
        float _Start;
        float _End;

        half ComputeFog(float z)
        {
            half fog = 0.0;
        #if FOG_LINEAR
            fog = (_End - z) / (_End - _Start);
        #elif FOG_EXP
            fog = exp2(-_Density * z);
        #else // FOG_EXP2
            fog = _Density * z;
            fog = exp2(-fog * fog);
        #endif
            return saturate(fog);
        }

        float ComputeDistance(float depth)
        {
            float dist = depth * _ProjectionParams.z;
            dist -= _ProjectionParams.y;
            return dist;
        }

        half4 FragFog(Varyings i) : SV_Target
        {
            half4 color = tex2D(_MainTex, i.uv);

            float depth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv);
            depth = Linear01Depth(depth);
            float dist = ComputeDistance(depth);
            half fog = 1.0 - ComputeFog(dist);

            return lerp(color, _FogColor, fog);
        }

        half4 FragFogExcludeSkybox(Varyings i) : SV_Target
        {
            half4 color = tex2D(_MainTex, i.uv);

            float depth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv);
            depth = Linear01Depth(depth);
            float skybox = depth < SKYBOX_THREASHOLD_VALUE;
            float dist = ComputeDistance(depth);
            half fog = 1.0 - ComputeFog(dist);

            return lerp(color, _FogColor, fog * skybox);
        }

    ENDCG

    SubShader
    {
        Cull Off ZWrite Off ZTest Always

        Pass
        {
            CGPROGRAM

                #pragma vertex VertFog
                #pragma fragment FragFog

            ENDCG
        }

        Pass
        {
            CGPROGRAM

                #pragma vertex VertFog
                #pragma fragment FragFogExcludeSkybox

            ENDCG
        }
    }
}
Shader "Hidden/Post FX/Fog"

{

    Properties

    {

        _MainTex("Main Texture", 2D) = "white" {}

    }



    CGINCLUDE



        #pragma multi_compile __ FOG_LINEAR FOG_EXP FOG_EXP2

        #include "UnityCG.cginc"

        #include "Common.cginc"



        #define SKYBOX_THREASHOLD_VALUE 0.9999



        struct Varyings

        {

            float2 uv : TEXCOORD0;

            float4 vertex : SV_POSITION;

        };



        Varyings VertFog(AttributesDefault v)

        {

            Varyings o;

            o.vertex = UnityObjectToClipPos(v.vertex);

            o.uv = UnityStereoScreenSpaceUVAdjust(v.texcoord, _MainTex_ST);

            return o;

        }



        sampler2D _CameraDepthTexture;



        half4 _FogColor;

        float _Density;

        float _Start;

        float _End;



        half ComputeFog(float z)

        {

            half fog = 0.0;

        #if FOG_LINEAR

            fog = (_End - z) / (_End - _Start);

        #elif FOG_EXP

            fog = exp2(-_Density * z);

        #else // FOG_EXP2

            fog = _Density * z;

            fog = exp2(-fog * fog);

        #endif

            return saturate(fog);

        }



        float ComputeDistance(float depth)

        {

            float dist = depth * _ProjectionParams.z;

            dist -= _ProjectionParams.y;

            return dist;

        }



        half4 FragFog(Varyings i) : SV_Target

        {

            half4 color = tex2D(_MainTex, i.uv);



            float depth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv);

            depth = Linear01Depth(depth);

            float dist = ComputeDistance(depth);

            half fog = 1.0 - ComputeFog(dist);



            return lerp(color, _FogColor, fog);

        }



        half4 FragFogExcludeSkybox(Varyings i) : SV_Target

        {

            half4 color = tex2D(_MainTex, i.uv);



            float depth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv);

            depth = Linear01Depth(depth);

            float skybox = depth < SKYBOX_THREASHOLD_VALUE;

            float dist = ComputeDistance(depth);

            half fog = 1.0 - ComputeFog(dist);



            return lerp(color, _FogColor, fog * skybox);

        }



    ENDCG



    SubShader

    {

        Cull Off ZWrite Off ZTest Always



        Pass

        {

            CGPROGRAM



                #pragma vertex VertFog

                #pragma fragment FragFog



            ENDCG

        }



        Pass

        {

            CGPROGRAM



                #pragma vertex VertFog

                #pragma fragment FragFogExcludeSkybox



            ENDCG

        }

    }

}