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228 lines
9.9 KiB
228 lines
9.9 KiB
3 years ago
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// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
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// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
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Shader "azure[Sky]/azure[Sky]_NoClouds"
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{
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// Properties
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// {
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//
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// }
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SubShader
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{
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Tags { "Queue"="Background" "RenderType"="Background" "PreviewType"="Skybox" "IgnoreProjector"="True" }
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Cull Back // Render side
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Fog{Mode Off} // Don't use fog
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ZWrite Off // Don't draw to bepth buffer
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Pass
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{
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CGPROGRAM
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#pragma target 3.0
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#pragma vertex vert
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#pragma fragment frag
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#pragma multi_compile HDR_ON HDR_OFF
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uniform float3 _Br;
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uniform float3 _Br2;
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uniform float3 _Bm;
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uniform float3 _Brm; //Br + Bm
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uniform float3 _mieG;
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uniform float _SunIntensity;
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uniform float _MoonIntensity;
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uniform float _Kr;
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uniform float _Km;
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uniform float _Altitude;
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uniform float _pi316;
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uniform float _pi14;
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uniform float _pi;
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uniform float _Exposure;
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uniform float _SkyLuminance;
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uniform float _SkyDarkness;
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uniform float _SunsetPower;
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uniform float _SunDiskSize;
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uniform float _SunDiskIntensity;
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uniform float _SunDiskPropagation;
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uniform float _MoonSize;
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uniform float _StarsIntensity;
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uniform float _StarsExtinction;
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uniform float _MilkyWayIntensity;
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uniform float _MilkyWayPower;
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// uniform float4 _SunColor;
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uniform float4 _SunsetColor;
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uniform float4 _MoonColor;
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uniform float4 _MoonBrightColor;
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uniform float _MoonExtinction;
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uniform int _MoonEclipseShadow;
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uniform float _Umbra;
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uniform float _UmbraSize;
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uniform float _Penumbra;
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uniform float _PenumbraSize;
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uniform sampler2D _MoonSampler;
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uniform samplerCUBE _StarField;
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uniform samplerCUBE _StarNoise;
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uniform samplerCUBE _MilkyWay;
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uniform float _ColorCorrection;
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uniform float3 _SunDir;
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uniform float3 _MoonDir;
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uniform float4x4 _SunMatrix;
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uniform float4x4 _MoonMatrix;
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uniform float4x4 _NoiseMatrix;
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uniform float4x4 _MilkyWayMatrix;
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uniform float4 _GroundCloseColor;
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uniform float4 _GroundFarColor;
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uniform float _FarColorDistance;
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uniform float _FarColorIntensity;
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uniform float4 _PenumbraColor;
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struct appdata{
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float4 vertex : POSITION;
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};
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struct v2f
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{
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float4 Position : SV_POSITION;
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float3 WorldPos : TEXCOORD0;
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float4 Fade : TEXCOORD1; // sunFade, mix, fadeOtherSideMoon.
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float3 moonPos : TEXCOORD2;
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float3 sunPos : TEXCOORD3;
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float2 nightCompute : TEXCOORD4;
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float3 noiseRot : TEXCOORD5;
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// float3 milkyWayPos : TEXCOORD6;
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};
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v2f vert(appdata v)
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{
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v2f o;
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UNITY_INITIALIZE_OUTPUT(v2f, o);
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o.Position = UnityObjectToClipPos(v.vertex);
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o.WorldPos = normalize(mul((float4x4)unity_ObjectToWorld, v.vertex)).xyz;
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float3 viewDir = normalize(o.WorldPos+float3(0.0,_Altitude,0.0));
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o.Fade.x = saturate( _SunDir.y + 0.25 ); // Fade the sun ("daysky") when cross the horizon.
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o.Fade.y = saturate(clamp(1.0 - _SunDir.y, 0.0, 0.5)); // Mix sunset"(fex)" with daysky"(1-fex)".
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o.Fade.z = saturate(dot(-_MoonMatrix[2].xyz,viewDir)); // Fade the other side moon generated by the moonMatrix
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o.Fade.w = pow(max(0.0,viewDir.y - 0.025),_MoonExtinction); // Fade the moon when cross the horizon.
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//////////
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//MATRIX//
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o.noiseRot = mul((float3x3)_NoiseMatrix,v.vertex.xyz); // Rotate noise texture to apply star scintillation
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o.sunPos = mul((float3x3)_SunMatrix,v.vertex.xyz);
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o.moonPos = mul((float3x3)_MoonMatrix,v.vertex.xyz);
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o.moonPos.x *= -1; //Invert x scale
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// For the rotation of the moon
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// o.moonPos.x = -dot(_MoonMatrix[0].xyz,v.vertex.xyz); // x scale inverted
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// o.moonPos.y = dot(_MoonMatrix[1].xyz,v.vertex.xyz);
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// o.moonPos.z = dot(_MoonMatrix[2].xyz,v.vertex.xyz);
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// o.nightCompute.x = pow(max(0.0,o.WorldPos.y),_StarsExtinction);
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o.nightCompute.x = pow(max(0.0,viewDir.y),_StarsExtinction);// Stars extinction from zenith to the horizon.
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o.nightCompute.y = (-_SunDir.y + _Altitude) * ((_MoonDir.y+0.25) + _Altitude);//Fade the moon Bright when is day or cross the horizon
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return o;
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}
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float4 frag(v2f IN) : SV_Target
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{
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//-------------------------------------------------------------------------------------------------------
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//-------------------------------------------Directions--------------------------------------------------
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float3 viewDir = normalize(IN.WorldPos);
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float sunCosTheta = dot( viewDir, _SunDir );
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viewDir = normalize(IN.WorldPos+float3(0.0,_Altitude,0.0)); // Change the horizon altitude. "(0.1=HorAlt)"
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//-------------------------------------------------------------------------------------------------------
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//-------------------------------------------Extinction--------------------------------------------------
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float zenith = acos(saturate(viewDir.y));
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float z = (cos(zenith) + 0.15 * pow(93.885 - ((zenith * 180.0) / _pi), -1.253));
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float SR = _Kr / z;
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float SM = _Km / z;
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float3 fex = exp(-(_Br*SR + _Bm*SM)); // Original fex calculation.
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float3 fex2 = exp(-(_Br2*SR + _Bm*SM)); // Fex calculation with rayleigh coefficient == 3. For the sunset.
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//-------------------------------------------------------------------------------------------------------
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//-----------------------------------------Sun Scattering------------------------------------------------
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//float rayPhase = 1.0 + pow(cosTheta,2.0); // Preetham rayleigh phase function.
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float rayPhase = 2.0 + 0.5 * pow(sunCosTheta,2.0); // Rayleigh phase function based on the Nielsen's paper.
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float miePhase = _mieG.x / pow(_mieG.y - _mieG.z * sunCosTheta,1.5); // The Henyey-Greenstein phase function.
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float3 BrTheta = _pi316 * _Br * rayPhase;
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float3 BmTheta = _pi14 * _Bm * miePhase;
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float3 BrmTheta = (BrTheta + BmTheta * 2.0) / (_Brm * 0.75); // Brm is "Br+Bm", and the sum is already made in the Control Script.
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float3 inScatter = BrmTheta * _SunIntensity * (1.0 - fex);
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inScatter *= saturate((lerp( _SunsetPower , pow(2000.0 * BrmTheta * fex2,0.5),IN.Fade.y) * 0.05));
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inScatter *= _SkyLuminance * _SunsetColor.rgb;
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inScatter *= pow((1-fex),_SkyDarkness);
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inScatter *= IN.Fade.x; // Sun fade in the horizon.
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////////////////
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// Solar Disk //
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float3 sunDisk = min(2, pow((1-sunCosTheta) * _SunDiskSize , _SunDiskPropagation )) * fex2 * _SunDiskIntensity;
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/////////////////
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//Lunar Eclipse//
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float Umbra = 1-min(_Umbra, pow((1-(-sunCosTheta)) * _SunDiskSize , -_UmbraSize )) ;
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float Penumbra = min(1, pow((1-(-sunCosTheta)) * _SunDiskSize , -_PenumbraSize ));
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float3 LunarEclipse = saturate(float3(Umbra, Umbra, Umbra) * (lerp(float3(1,1,1), _PenumbraColor,Penumbra * _Penumbra)));
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//-------------------------------------------------------------------------------------------------------
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//--------------------------------------------Night Sky--------------------------------------------------
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float nightIntensity = 0.25;
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float3 nightSky = saturate((pow( 1-fex2, 2.0) * nightIntensity) * (1-IN.Fade.x)); // Defaut night sky color
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nightSky *= saturate(pow((1-fex2),_SkyDarkness));
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nightSky *= _SkyLuminance;
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float3 groundColor = lerp(_GroundCloseColor, _GroundFarColor, (viewDir.y + _FarColorDistance));
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nightSky = saturate(lerp(groundColor, nightSky, saturate(dot(viewDir.y + _FarColorIntensity, float3(0,1,0)))) * (1-fex));
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// nightSky = saturate(lerp(groundColor, nightSky, viewDir.y + _LerpNightSkyDistance) * (1-fex));
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////////////////
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// Moon //
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float4 moonSampler = tex2D(_MoonSampler, IN.moonPos.xy * _MoonSize + float2(0.5,0.5)) * IN.Fade.z * lerp(1, float4(LunarEclipse,1),_MoonEclipseShadow);
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float4 moonColor = ( moonSampler ) * IN.Fade.w;
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float moonMask = (1 - moonSampler.a); // To hide the stars that are behind the moon
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float3 moonBright = saturate( (_MoonBrightColor.rgb * _MoonIntensity) * pow(dot(viewDir, _MoonDir),5.0) * IN.nightCompute.y ) * (1-(moonColor.b)) * 3 * IN.Fade.z;
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////////////////
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// Stars //
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float fadeStar = IN.nightCompute.x * _StarsIntensity * (1.0 - moonBright * 10.0); // When the stars will emerge and fade.
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float scintillation = texCUBE(_StarNoise, IN.noiseRot.xyz) * 2.0;
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float3 stars = saturate(texCUBE(_StarField, IN.sunPos.xyz) * fadeStar * moonMask) * scintillation;
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////////////////
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// Milkyway //
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float3 milkyWay = saturate(pow(texCUBE(_MilkyWay, mul((float3x3)_MilkyWayMatrix, IN.sunPos.xyz)), _MilkyWayPower) * fadeStar * moonMask) * _MilkyWayIntensity;
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nightSky += stars + milkyWay + moonBright;
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//*******************************************************************************************************
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//-------------------------------------------------------------------------------------------------------
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//------------------------------------------Sky finalization---------------------------------------------
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inScatter += sunDisk;
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float3 finalSky = (inScatter + nightSky);
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////////////////
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// tonemaping //
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#ifndef HDR_ON
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finalSky = saturate( 1.0 - exp( -_Exposure * finalSky ));
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#endif
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finalSky *= lerp(1, moonColor, moonColor.b);
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finalSky += moonColor.rgb;
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//////////////////////
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// Color Correction //
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finalSky = pow(finalSky,_ColorCorrection);
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return float4(finalSky,1.0);
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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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