mirror of
https://github.com/X0nk/Bliss-Shader.git
synced 2025-01-04 00:23:41 +08:00
403 lines
12 KiB
GLSL
403 lines
12 KiB
GLSL
#ifdef HQ_CLOUDS
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int maxIT_clouds = minRayMarchSteps;
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int maxIT = maxRayMarchSteps;
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#else
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int maxIT_clouds = minRayMarchStepsLQ;
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int maxIT = maxRayMarchStepsLQ;
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#endif
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#ifdef HQ_CLOUDS
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const int cloudLoD = cloud_LevelOfDetail;
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const int cloudShadowLoD = cloud_ShadowLevelOfDetail;
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#else
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const int cloudLoD = cloud_LevelOfDetailLQ;
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const int cloudShadowLoD = cloud_ShadowLevelOfDetailLQ;
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#endif
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uniform float viewHeight;
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uniform float viewWidth;
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uniform sampler2D colortex4;//Skybox
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#define WEATHERCLOUDS
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#include "/lib/climate_settings.glsl"
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float CumulusHeight = Cumulus_height;
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float MaxCumulusHeight = CumulusHeight + 100;
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float AltostratusHeight = 2000;
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float rainCloudwetness = rainStrength;
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float cloud_movement = frameTimeCounter * Cloud_Speed;
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//3D noise from 2d texture
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float densityAtPos(in vec3 pos){
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pos /= 18.;
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pos.xz *= 0.5;
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vec3 p = floor(pos);
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vec3 f = fract(pos);
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vec2 uv = p.xz + f.xz + p.y * vec2(0.0,193.0);
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vec2 coord = uv / 512.0;
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//The y channel has an offset to avoid using two textures fetches
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vec2 xy = texture2D(noisetex, coord).yx;
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return mix(xy.r,xy.g, f.y);
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}
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float cloudCov(in vec3 pos,vec3 samplePos){
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float CloudLarge = texture2D(noisetex, (samplePos.xz + cloud_movement) / 5000 ).b;
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float CloudSmall = texture2D(noisetex, (samplePos.xz - cloud_movement) / 500 ).r;
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float Topshape = max(pos.y - (MaxCumulusHeight - 75), 0.0) / 200;
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Topshape += max(exp((pos.y - MaxCumulusHeight) / 10.0 ), 0.0) ;
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float coverage = abs(pow(CloudLarge,1)*2.0 - 1.2)*0.5 - (1.0-CloudSmall);
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float FinalShape = DailyWeather_Cumulus(coverage) - Topshape;
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// cap the top and bottom for reasons
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float capbase = sqrt(max((CumulusHeight+12.5) - pos.y, 0.0)/50) ;
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float captop = max(pos.y - MaxCumulusHeight, 0.0);
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FinalShape = max(FinalShape - capbase - captop, 0.0);
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return FinalShape;
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}
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//Erode cloud with 3d Perlin-worley noise, actual cloud value
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float cloudVol(in vec3 pos,in vec3 samplePos,in float cov, in int LoD){
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float noise = 0.0 ;
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float totalWeights = 0.0;
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float pw = log(fbmPower1);
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float pw2 = log(fbmPower2);
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samplePos.xz -= cloud_movement/4;
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samplePos.xz += pow( max(pos.y - (CumulusHeight+20), 0.0) / 20.0,1.50);
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noise += 1.0-densityAtPos(samplePos * 200.) ;
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float smallnoise = densityAtPos(samplePos * 600.);
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if (LoD > 0) noise += ((1-smallnoise) - max(0.15 - abs(smallnoise * 2.0 - 0.55) * 0.5,0.0)*1.5) * 0.5;
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noise *= 1.0-cov;
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noise = noise*noise;
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float cloud = max(cov - noise*noise*fbmAmount,0.0);
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return cloud;
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}
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float GetCumulusDensity(in vec3 pos, in int LoD){
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vec3 samplePos = pos*vec3(1.0,1./48.,1.0)/4;
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float coverageSP = cloudCov(pos,samplePos);
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if (coverageSP > 0.001) {
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if (LoD < 0) return max(coverageSP - 0.27*fbmAmount,0.0);
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return cloudVol(pos,samplePos,coverageSP,LoD);
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} else return 0.0;
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}
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float GetAltostratusDensity(vec3 pos){
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float large = texture2D(noisetex, (pos.xz + cloud_movement)/100000. ).b;
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float small = texture2D(noisetex, (pos.xz - cloud_movement)/10000. - vec2(-large,1-large)/5).b;
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float shape = (small + pow((1.0-large),2.0))/2.0;
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float Coverage; float Density;
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DailyWeather_Alto(Coverage,Density);
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shape = pow(max(shape + Coverage - 0.5,0.0),2.0);
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shape *= Density;
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return shape;
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}
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// random magic number bullshit go!
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vec3 Cloud_lighting(
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float CloudShape,
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float SkyShadowing,
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float SunShadowing,
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float MoonShadowing,
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vec3 SkyColors,
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vec3 sunContribution,
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vec3 sunContributionMulti,
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vec3 moonContribution,
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float AmbientShadow,
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int cloudType,
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vec3 pos
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){
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float coeeff = -30;
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// float powder = 1.0 - exp((CloudShape*CloudShape) * -800);
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float powder = 1.0 - exp(CloudShape * coeeff/3);
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float lesspowder = powder*0.4+0.6;
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vec3 skyLighting = SkyColors;
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#ifdef Altostratus
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float Coverage; float Density;
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DailyWeather_Alto(Coverage,Density);
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skyLighting += sunContributionMulti * exp(SunShadowing * -3) * clamp(Coverage * (1-Density),0,1);
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// skyLighting += (sunContributionMulti * 5.0 * exp(SunShadowing * -3)) * exp(altoShadow * -0.1);
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#endif
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skyLighting *= exp(SkyShadowing * AmbientShadow * coeeff/2 ) * lesspowder ;
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if(cloudType == 1){
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coeeff = -10;
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skyLighting = SkyColors * exp(SkyShadowing * coeeff/15) * lesspowder;
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}
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vec3 sunLighting = exp(SunShadowing * coeeff + powder) * sunContribution;
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sunLighting += exp(SunShadowing * coeeff/4 + powder*2) * sunContributionMulti;
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vec3 moonLighting = exp(MoonShadowing * coeeff / 3) * moonContribution * powder;
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return skyLighting + moonLighting + sunLighting ;
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// return skyLighting;
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}
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//Mie phase function
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float phaseg(float x, float g){
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float gg = g * g;
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return (gg * -0.25 + 0.25) * pow(-2.0 * (g * x) + (gg + 1.0), -1.5) / 3.14;
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}
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float CustomPhase(float LightPos, float S_1, float S_2){
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float SCALE = S_2; // remember the epislons 0.001 is fine.
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float N = S_1;
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float N2 = N / SCALE;
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float R = 1;
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float A = pow(1.0 - pow(max(R-LightPos,0.0), N2 ),N);
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return A;
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}
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float PhaseHG(float cosTheta, float g) {
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float denom = 1 + g * g + 2 * g * cosTheta;
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const float Inv4Pi = 0.07957747154594766788;
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return Inv4Pi * (1 - g * g) / (denom * sqrt(denom));
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}
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vec4 renderClouds(
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vec3 FragPosition,
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vec2 Dither,
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vec3 SunColor,
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vec3 MoonColor,
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vec3 SkyColor
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){
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#ifndef VOLUMETRIC_CLOUDS
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return vec4(0.0,0.0,0.0,1.0);
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#endif
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float total_extinction = 1.0;
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vec3 color = vec3(0.0);
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//project pixel position into projected shadowmap space
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vec4 fragpos = normalize(gbufferModelViewInverse*vec4(FragPosition,1.0));
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maxIT_clouds = int(clamp( maxIT_clouds / sqrt(exp2(fragpos.y)),0.0, maxIT));
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vec3 dV_view = normalize(fragpos.xyz);
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dV_view.y += 0.05;
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vec3 dV_view2 = dV_view;
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float mult2 = length(dV_view2);
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//setup ray to start at the start of the cloud plane and end at the end of the cloud plane
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dV_view *= max(MaxCumulusHeight - CumulusHeight, 0.0)/abs(dV_view.y)/maxIT_clouds;
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float mult = length(dV_view);
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// i want the samples to stay at one point in the world, but as the height coordinates go negative everything goes insideout, so this is a work around....
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float startFlip = mix(max(cameraPosition.y - MaxCumulusHeight,0.0), max(CumulusHeight-cameraPosition.y,0), clamp(dV_view.y,0,1));
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// vec3 progress_view = dV_view*Dither.x + cameraPosition + (dV_view/abs(dV_view.y))*startFlip;
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vec3 progress_view = dV_view*Dither.x + cameraPosition + (dV_view/abs(dV_view.y))*startFlip;
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// thank you emin for this world interseciton thing
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// float lViewPosM = length(FragPosition) < far * 1.5 ? length(FragPosition) - 1.0 : 1000000000.0;
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// bool IntersecTerrain = false;
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////// lighitng stuff
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float shadowStep = 200.;
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vec3 dV_Sun = normalize(mat3(gbufferModelViewInverse)*sunVec)*shadowStep;
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vec3 dV_Sun_small = dV_Sun/shadowStep;
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float SdotV = dot(sunVec,normalize(FragPosition));
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SkyColor *= clamp(abs(dV_Sun.y)/100.,0.75,1.0);
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SunColor = SunColor * clamp(dV_Sun.y ,0.0,1.0);
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MoonColor *= clamp(-dV_Sun.y,0.0,1.0);
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if(dV_Sun.y/shadowStep < -0.1) dV_Sun = -dV_Sun;
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float mieDay = phaseg(SdotV, 0.75) * 2;
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float mieDayMulti = phaseg(SdotV, 0.35) * 2;
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vec3 sunContribution = SunColor * mieDay;
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vec3 sunContributionMulti = SunColor * mieDayMulti ;
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float mieNight = (phaseg(-SdotV,0.8) + phaseg(-SdotV, 0.35)*4) * 6.0;
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vec3 moonContribution = MoonColor * mieNight;
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#ifdef Cumulus
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for(int i=0;i<maxIT_clouds;i++) {
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// IntersecTerrain = length(progress_view - cameraPosition) > lViewPosM;
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// if(IntersecTerrain) break;
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float cumulus = GetCumulusDensity(progress_view, cloudLoD);
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float alteredDensity = Cumulus_density * clamp(exp( (progress_view.y - (MaxCumulusHeight - 75)) / 9.0 ),0.0,1.0);
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if(cumulus > 1e-5){
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float muE = cumulus*alteredDensity;
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float Sunlight = 0.0;
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float MoonLight = 0.0;
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for (int j=0; j < 3; j++){
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vec3 shadowSamplePos = progress_view + (dV_Sun * 0.15) * (1 + Dither.y/2 + j);
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float shadow = GetCumulusDensity(shadowSamplePos, 0) * Cumulus_density;
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Sunlight += shadow / (1 + j);
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MoonLight += shadow;
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}
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#ifdef Altostratus
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// cast a shadow from higher clouds onto lower clouds
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vec3 HighAlt_shadowPos = progress_view + dV_Sun/abs(dV_Sun.y) * max(AltostratusHeight - progress_view.y,0.0);
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float HighAlt_shadow = GetAltostratusDensity(HighAlt_shadowPos);
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Sunlight += HighAlt_shadow;
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#endif
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float phase = PhaseHG(-SdotV, (1.0-cumulus));
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float ambientlightshadow = 1.0-clamp(exp((progress_view.y - (MaxCumulusHeight - 50)) / 100.0),0.0,1.0);
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vec3 S = Cloud_lighting(muE, cumulus*Cumulus_density, Sunlight, MoonLight, SkyColor, sunContribution, sunContributionMulti, moonContribution, ambientlightshadow, 0, progress_view);
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vec3 Sint = (S - S * exp(-mult*muE)) / muE;
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color += max(muE*Sint*total_extinction,0.0);
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total_extinction *= max(exp(-mult*muE),0.0);
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if (total_extinction < 1e-5) break;
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}
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progress_view += dV_view;
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}
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#endif
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#ifdef Altostratus
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if (max(AltostratusHeight-cameraPosition.y,0.0)/max(normalize(dV_view).y,0.0) / 100000.0 < AltostratusHeight) {
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vec3 progress_view_high = dV_view2 + cameraPosition + dV_view2/dV_view2.y * max(AltostratusHeight-cameraPosition.y,0.0);
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float altostratus = GetAltostratusDensity(progress_view_high);
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float Sunlight = 0.0;
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float MoonLight = 0.0;
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if(altostratus > 1e-5){
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for (int j = 0; j < 2; j++){
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vec3 shadowSamplePos_high = progress_view_high + dV_Sun * float(j+Dither.y);
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float shadow = GetAltostratusDensity(shadowSamplePos_high);
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Sunlight += shadow;
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}
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vec3 S = Cloud_lighting(altostratus, altostratus, Sunlight, MoonLight, SkyColor, sunContribution, sunContributionMulti, moonContribution, 1, 1, progress_view_high);
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vec3 Sint = (S - S * exp(-20*altostratus)) / altostratus;
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color += max(altostratus*Sint*total_extinction,0.0);
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total_extinction *= max(exp(-20*altostratus),0.0);
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}
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}
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#endif
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vec3 normView = normalize(dV_view);
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// Assume fog color = sky gradient at long distance
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vec3 fogColor = skyFromTex(normView, colortex4)/150. * 5.0;
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float dist = max(cameraPosition.y+CumulusHeight,abs(CumulusHeight))/abs(normView.y);
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float fog = exp(dist / -5000.0 * (1.0+rainCloudwetness*8.));
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// if(IntersecTerrain) fog = 1.0;
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return mix(vec4(fogColor,0.0), vec4(color,total_extinction), fog);
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// return vec4(color,total_extinction);
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}
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float GetCloudShadow(vec3 eyePlayerPos){
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vec3 playerPos = eyePlayerPos + cameraPosition;
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playerPos.y += 0.05;
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float shadow = 0.0;
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// assume a flat layer of cloud, and stretch the sampled density along the sunvector, starting from some vertical layer in the cloud.
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#ifdef Cumulus
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vec3 lowShadowStart = playerPos + WsunVec/abs(WsunVec.y) * max((MaxCumulusHeight - 70) - playerPos.y,0.0) ;
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shadow += GetCumulusDensity(lowShadowStart,1)*Cumulus_density;
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#endif
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#ifdef Altostratus
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vec3 highShadowStart = playerPos + WsunVec/abs(WsunVec.y) * max(AltostratusHeight - playerPos.y,0.0);
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shadow += GetAltostratusDensity(highShadowStart);
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#endif
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shadow = shadow/2.0; // perhaps i should average the 2 shadows being added....
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shadow = clamp(exp(-shadow*20.0),0.0,1.0);
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return shadow;
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}
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float GetCloudShadow_VLFOG(vec3 WorldPos){
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float shadow = 0.0;
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// assume a flat layer of cloud, and stretch the sampled density along the sunvector, starting from some vertical layer in the cloud.
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#ifdef Cumulus
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vec3 lowShadowStart = WorldPos + WsunVec/abs(WsunVec.y) * max((MaxCumulusHeight - 70) - WorldPos.y,0.0) ;
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shadow += GetCumulusDensity(lowShadowStart,0)*Cumulus_density;
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#endif
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#ifdef Altostratus
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vec3 highShadowStart = WorldPos + WsunVec/abs(WsunVec.y) * max(AltostratusHeight - WorldPos.y,0.0);
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shadow += GetAltostratusDensity(highShadowStart);
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#endif
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// shadow = shadow/2.0; // perhaps i should average the 2 shadows being added....
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shadow = clamp(exp(-shadow*15.0),0.0,1.0);
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// do not allow it to exist above the lowest cloud plane
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shadow *= clamp(((MaxCumulusHeight + CumulusHeight)*0.435 - WorldPos.y)/100,0.0,1.0) ;
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return shadow;
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}
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float GetAltoOcclusion(vec3 eyePlayerPos){
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vec3 playerPos = eyePlayerPos + cameraPosition;
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playerPos.y += 0.05;
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float shadow = 0.0;
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vec3 lowShadowStart = playerPos + normalize(vec3(0,1,0)) * max((MaxCumulusHeight - 70) - playerPos.y,0.0) ;
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shadow = GetCumulusDensity(lowShadowStart,0) * cloudDensity;
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shadow = clamp(exp(shadow * -1),0.0,1.0);
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return shadow;
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} |