98 lines
2.4 KiB
Plaintext
98 lines
2.4 KiB
Plaintext
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Shader "Hidden/FogPlus"
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{
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Properties
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{
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[HideInInspector]_MainTex ("Texture", 2D) = "white" { }
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}
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SubShader
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{
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Cull Off ZWrite Off ZTest Always Fog
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{
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Mode Off
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}
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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UNITY_DECLARE_DEPTH_TEXTURE(_CameraDepthTexture);
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sampler2D _MainTex;
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sampler2D _DistanceLUT;
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fixed _Near;
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fixed _Far;
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half _UseDistanceFog;
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half _UseDistanceFogOnSky;
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sampler2D _HeightLUT;
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fixed _LowWorldY;
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fixed _HighWorldY;
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half _UseHeightFog;
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half _UseHeightFogOnSky;
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fixed _DistanceFogIntensity;
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fixed _HeightFogIntensity;
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fixed _DistanceHeightBlend;
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#define ALMOST_ONE 0.999
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struct v2f
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{
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float2 uv: TEXCOORD0;
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float4 vertex: SV_POSITION;
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float2 depth_uv: TEXCOORD1;
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float3 screen_pos: TEXCOORD2;
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};
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v2f vert(appdata_img v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.screen_pos = ComputeScreenPos(o.vertex);
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o.uv = v.texcoord;
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o.depth_uv = v.texcoord;
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return o;
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}
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fixed4 frag(v2f i): SV_Target
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{
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fixed4 original = tex2D(_MainTex, i.uv);
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float depthPacked = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.depth_uv);
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float depthEye = LinearEyeDepth(depthPacked);
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float depthCameraPlanes = Linear01Depth(depthPacked);
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float depthAbsolute = _ProjectionParams.y + (_ProjectionParams.z - _ProjectionParams.y) * depthCameraPlanes;
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float depthFogPlanes = saturate((depthAbsolute - _Near) / (_Far - _Near));
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float isSky = step(ALMOST_ONE, depthCameraPlanes);
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float4 distanceFog = tex2D(_DistanceLUT, float2(depthFogPlanes, 0.5));
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distanceFog.a *= step(isSky, _UseDistanceFogOnSky);
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distanceFog.a *= _UseDistanceFog * _DistanceFogIntensity;
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float3 worldPos = i.screen_pos * depthEye + _WorldSpaceCameraPos;
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float heightUV = saturate((worldPos.y - _LowWorldY) / (_HighWorldY - _LowWorldY));
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fixed4 heightFog = tex2D(_HeightLUT, float2(heightUV, 0.5));
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heightFog.a *= step(isSky, _UseHeightFogOnSky);
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heightFog.a *= _UseHeightFog * _HeightFogIntensity;
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fixed fogBlend = _DistanceHeightBlend;
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if (!_UseDistanceFog) fogBlend = 1.0;
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if(!_UseHeightFog) fogBlend = 0.0;
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fixed4 fog = lerp(distanceFog, heightFog, fogBlend);
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fixed4 final = lerp(original, fog, fog.a);
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final.a = original.a;
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return final;
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}
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ENDCG
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}
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}
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}
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