255 lines
9.9 KiB
HLSL
255 lines
9.9 KiB
HLSL
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#include "UnityCG.cginc"
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uniform float4 _HeightParams;
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uniform float4 _DistanceParams;
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uniform int4 _SceneFogMode;
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uniform float4 _SceneFogParams;
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uniform sampler2D _EnviroVolumeLightingTex;
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uniform float4 _FogNoiseData;// x: scale, y: intensity, z: intensity offset
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uniform float4 _FogNoiseVelocity; // x: x velocity, y: z velocity
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uniform float4 _EnviroParams; //gametime,distance,height,_tonemapping
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uniform float _EnviroVolumeDensity;
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uniform float3 _Br;
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uniform float3 _Bm;
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uniform float3 _BmScene;
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uniform float3 _mieG;
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uniform float3 _mieGScene;
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uniform float _FogExposure;
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uniform float _SkyLuminance;
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uniform float _scatteringPower;
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uniform float4 _SunParameters; //x = _SunIntensity, y = _SunDiskSize, z = _SunDiskIntensity, w = SkyFog Height Lerp;
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uniform float4 _scatteringColor;
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uniform float _SkyColorPower;
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uniform float3 _SunDir;
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uniform float _scatteringStrenght;
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uniform half _distanceFogIntensity;
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uniform float4 _EnviroSkyFog; // x = _SkyFogHeight, y = _SkyFogIntensity, z = _SkyFogStart, w = _HeightFogIntensity
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uniform float _maximumFogDensity;
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uniform float4 _weatherSkyMod;
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uniform float4 _weatherFogMod;
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uniform float _lightning;
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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half3 tonemapACES(half3 color, float Exposure)
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{
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color *= Exposure;
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// See https://knarkowicz.wordpress.com/2016/01/06/aces-filmic-tone-mapping-curve/
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const half a = 2.51;
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const half b = 0.03;
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const half c = 2.43;
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const half d = 0.59;
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const half e = 0.14;
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return saturate((color * (a * color + b)) / (color * (c * color + d) + e));
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}
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half ComputeFogFactor (float coord)
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{
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float fogFac = 0.0;
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if (_SceneFogMode.x == 1) // linear
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{
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fogFac = coord * _SceneFogParams.z + _SceneFogParams.w;
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}
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if (_SceneFogMode.x == 2) // exp
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{
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fogFac = _SceneFogParams.y * coord; fogFac = exp2(-fogFac);
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}
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if (_SceneFogMode.x == 3) // exp2
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{
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fogFac = _SceneFogParams.x * coord; fogFac = exp2(-fogFac*fogFac);
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}
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return saturate(fogFac);
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}
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// Distance fog
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float ComputeDistance (float3 camDir, float zdepth)
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{
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float dist;
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dist = length(camDir);
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// Built-in fog starts at near plane, so match that by
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// subtracting the near value. Not a perfect approximation
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// if near plane is very large, but good enough.
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dist -= _ProjectionParams.y;
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return dist;
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}
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// Linear height fog,
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float ComputeHalfSpace (float3 wsDir)
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{
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float3 wpos = _WorldSpaceCameraPos + wsDir;
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float FH = _HeightParams.x;
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float3 C = _WorldSpaceCameraPos;
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float3 V = wsDir;
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float3 P = wpos;
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float3 aV = (_HeightParams.w * _EnviroSkyFog.w) * V;
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float FdotC = _HeightParams.y;
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float k = _HeightParams.z;
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float FdotP = P.y-FH;
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float FdotV = wsDir.y;
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float c1 = k * (FdotP + FdotC);
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float c2 = (1-2*k) * FdotP;
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float g = min(c2, 0.0);
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g = -length(aV) * (c1 - g * g / abs(FdotV+1.0e-5f));
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return g;
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}
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float4 ComputeScattering (float3 viewDir, float2 sunPos)
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{
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float cosTheta = dot(viewDir, _SunDir);
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viewDir = viewDir + float3(0.0, 0.1 ,0.0);
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float zen = acos(saturate(viewDir.y));
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float alb = (cos(zen) + 0.5 * pow(93.885 - ((zen * 180.0) / 3.141592), - 0.253)); // pi
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float3 fex = exp(-(_Br * (4 / alb) + _Bm * (1.25 / alb)));
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float rayPhase = 2.5 + pow(cosTheta,1);
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float miePhase = _mieG.x / pow(_mieG.y - _mieG.z * cosTheta, 1);
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float3 BrTheta = 0.059683 * _Br * rayPhase;
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float3 BmTheta = 0.079577 * _Bm * miePhase;
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float3 BrmTheta = (BrTheta + BmTheta * 2.0) / ((_Bm + _Br) * 0.75);
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float3 scattering = BrmTheta * _SunParameters.x * (1.0 - fex);
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float3 skyFinalize = saturate((pow( 1.0 - fex, 2.0) * 0.234) * (1 - sunPos.x)) * _SkyLuminance;
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skyFinalize = saturate(lerp(float3(0.1,0.1,0.1), skyFinalize, saturate(dot(viewDir.y + 0.3, float3(0,1,0)))) * (1-fex));
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scattering *= saturate((lerp(float3(_scatteringPower, _scatteringPower, _scatteringPower), pow(2000.0f * BrmTheta * fex, 0.7), sunPos.y) * 0.05));
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scattering *= (_SkyLuminance * _scatteringColor.rgb * _scatteringStrenght) * pow((1.0 - fex), 1.0) * sunPos.x;
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//skyFinalize = lerp(skyFinalize,lerp(skyFinalize,_weatherFogMod, clamp(cosTheta,0,1)), _weatherFogMod.a);
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float4 fogScattering = float4((scattering + skyFinalize), 1);
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//Tonemapping
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if (_EnviroParams.w == 1)
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{
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fogScattering.rgb = tonemapACES(fogScattering.rgb, _FogExposure);
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}
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fogScattering = pow(fogScattering,_SkyColorPower);
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fogScattering = lerp(fogScattering,lerp(fogScattering,_weatherSkyMod, clamp(cosTheta,0,1)), _weatherSkyMod.a);
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fogScattering = lerp(fogScattering, lerp(fogScattering, _weatherFogMod, _weatherFogMod.a), _weatherFogMod.a);
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if(_lightning > 1)
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fogScattering = fogScattering + (_lightning * 0.06);
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return fogScattering;
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}
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float4 ComputeScatteringClouds(float3 viewDir, float2 sunPos, float time)
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{
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float cosTheta = dot(viewDir, _SunDir);
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viewDir = viewDir + float3(0.0, 0.1, 0.0);
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float zen = acos(saturate(viewDir.y));
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float alb = (cos(zen) + 0.5 * pow(93.885 - ((zen * 180.0) / 3.141592), -0.253)); // pi
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float3 fex = exp(-(_Br * (4 / alb) + _Bm * (1.25 / alb)));
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float rayPhase = 2.5 + pow(cosTheta, 1);
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float miePhase = _mieGScene.x / pow(_mieGScene.y - _mieGScene.z * cosTheta, 1);
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float3 BrTheta = 0.059683 * _Br * rayPhase;
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float3 BmTheta = 0.079577 * _BmScene * miePhase;
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float3 BrmTheta = (BrTheta + BmTheta * 2.0) / ((_BmScene + _Br) * 0.75);
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float3 scattering = BrmTheta * _SunParameters.x * (1.0 - fex);
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float3 skyFinalize = saturate((pow(1.0 - fex, 2.0) * 0.234) * (1 - sunPos.x)) * _SkyLuminance;
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skyFinalize = saturate(lerp(float3(0.1, 0.1, 0.1), skyFinalize, saturate(dot(viewDir.y + 0.3, float3(0, 1, 0)))) * (1 - fex));
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scattering *= saturate((lerp(float3(_scatteringPower, _scatteringPower, _scatteringPower), pow(2000.0f * BrmTheta * fex, 0.7), sunPos.y) * 0.05));
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scattering *= (_SkyLuminance * _scatteringColor.rgb * _scatteringStrenght) * pow((1.0 - fex), 1.0) * sunPos.x;
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//skyFinalize = lerp(skyFinalize, lerp(skyFinalize, _weatherFogMod, clamp(cosTheta, 0, 1)), _weatherFogMod.a);
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float4 fogScattering = float4((scattering + skyFinalize), 1);
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//Tonemapping
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if (_EnviroParams.w == 1)
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{
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fogScattering.rgb = tonemapACES(fogScattering.rgb, _FogExposure);
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}
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fogScattering = pow(fogScattering, _SkyColorPower);
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fogScattering = lerp(fogScattering, lerp(fogScattering, _weatherSkyMod, clamp(cosTheta, 0, 1)), _weatherSkyMod.a);
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fogScattering = lerp(fogScattering, lerp(fogScattering, _weatherFogMod, _weatherFogMod.a), _weatherFogMod.a);
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return fogScattering * time;
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}
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float4 ComputeScatteringScene (float3 viewDir, float2 sunPos)
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{
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float cosTheta = dot(viewDir, _SunDir);
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viewDir = viewDir + float3(0.0, 0.1 ,0.0);
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float zen = acos(saturate(viewDir.y));
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float alb = (cos(zen) + 0.5 * pow(93.885 - ((zen * 180.0) / 3.141592), - 0.253)); // pi
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float3 fex = exp(-(_Br * (4 / alb) + _BmScene * (1.25 / alb)));
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float rayPhase = 2.5 + pow(cosTheta,1);
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float miePhase = _mieGScene.x / pow(_mieGScene.y - _mieGScene.z * cosTheta, 1);
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float3 BrTheta = 0.059683 * _Br * rayPhase;
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float3 BmTheta = 0.079577 * _BmScene * miePhase;
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float3 BrmTheta = (BrTheta + BmTheta * 2.0) / ((_BmScene + _Br) * 0.75);
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float3 scattering = BrmTheta * _SunParameters.x * (1.0 - fex);
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float3 skyFinalize = saturate((pow( 1.0 - fex, 2.0) * 0.234) * (1 - sunPos.x)) * _SkyLuminance;
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skyFinalize = saturate(lerp(float3(0.1,0.1,0.1), skyFinalize, saturate(dot(viewDir.y + 0.3, float3(0,1,0)))) * (1-fex));
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scattering *= saturate((lerp(float3(_scatteringPower, _scatteringPower, _scatteringPower), pow(2000.0f * BrmTheta * fex, 0.7), sunPos.y) * 0.05));
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scattering *= (_SkyLuminance * _scatteringColor.rgb * _scatteringStrenght) * pow((1.0 - fex), 1.0) * sunPos.x;
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float4 fogScattering = float4((scattering + skyFinalize), 1);
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//Tonemapping
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if (_EnviroParams.w == 1)
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{
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fogScattering.rgb = tonemapACES(fogScattering.rgb, _FogExposure);
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}
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fogScattering = pow(fogScattering,_SkyColorPower);
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fogScattering = lerp(fogScattering, lerp(fogScattering, _weatherSkyMod, clamp(cosTheta, 0, 1)), _weatherSkyMod.a);
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fogScattering = lerp(fogScattering, lerp(fogScattering, _weatherFogMod, _weatherFogMod.a), _weatherFogMod.a);
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if(_lightning > 1)
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fogScattering = fogScattering + (_lightning * 0.06);
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return fogScattering;
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}
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float4 TransparentFog(float4 clr, float3 wPos,float2 uv, half depth)
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{
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float3 wsDir = wPos - _WorldSpaceCameraPos;
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float g = _DistanceParams.x;
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if (_EnviroParams.y > 0)
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{
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g += ComputeDistance (wsDir, depth);
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g *= _distanceFogIntensity ;
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}
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if (_EnviroParams.z > 0)
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{
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//g += ComputeHalfSpaceWithNoise (wsDir);
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g += ComputeHalfSpace(wsDir);
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}
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float fogFac = ComputeFogFactor (max(0.0,g));
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fogFac = lerp(_maximumFogDensity,1.0f,fogFac);
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float4 fogClr = float4(0, 0, 0, 0);
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#ifdef UNITY_PASS_FORWARDADD
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float4 volumeLighting = float4(0, 0, 0, 0);
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#else
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#if ENVIRO_SIMPLE_FOG
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fogClr = unity_FogColor;
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#else
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float2 sunDir;
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sunDir.x = saturate(_SunDir.y + 0.25);
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sunDir.y = saturate(clamp(1.0 - _SunDir.y, 0.0, 0.5));
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fogClr = ComputeScatteringScene(normalize(wsDir), sunDir);
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#endif
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#if UNITY_SINGLE_PASS_STEREO
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float4 scaleOffset = unity_StereoScaleOffset[unity_StereoEyeIndex];
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uv = (uv - scaleOffset.zw) / scaleOffset.xy;
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#endif
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float4 volumeLighting = tex2D(_EnviroVolumeLightingTex, UnityStereoTransformScreenSpaceTex(uv)) * _EnviroParams.x;
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#endif
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float4 final = lerp (lerp(fogClr, fogClr + volumeLighting, _EnviroVolumeDensity), lerp(clr, clr + volumeLighting, _EnviroVolumeDensity), fogFac);
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return final;
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}
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