mirror of
https://github.com/X0nk/Bliss-Shader.git
synced 2024-12-23 01:59:39 +08:00
483 lines
18 KiB
GLSL
483 lines
18 KiB
GLSL
#define ALTOSTRATUS_LAYER 2
|
|
#define LARGECUMULUS_LAYER 1
|
|
#define SMALLCUMULUS_LAYER 0
|
|
|
|
uniform int worldDay;
|
|
uniform int worldTime;
|
|
float cloud_movement = (worldTime + mod(worldDay,100)*24000.0) / 24.0 * Cloud_Speed;
|
|
|
|
float densityAtPos(in vec3 pos){
|
|
pos /= 18.;
|
|
pos.xz *= 0.5;
|
|
vec3 p = floor(pos);
|
|
vec3 f = fract(pos);
|
|
vec2 uv = p.xz + f.xz + p.y * vec2(0.0,193.0);
|
|
vec2 coord = uv / 512.0;
|
|
|
|
//The y channel has an offset to avoid using two textures fetches
|
|
vec2 xy = texture2D(noisetex, coord).yx;
|
|
|
|
return mix(xy.r,xy.g, f.y);
|
|
}
|
|
|
|
float getCloudShape(int LayerIndex, int LOD, in vec3 position, float minHeight, float maxHeight){
|
|
|
|
vec3 samplePos = position*vec3(1.0, 1.0/48.0, 1.0)/4.0;
|
|
|
|
float coverage = 0.0;
|
|
float shape = 0.0;
|
|
float largeCloud = 0.0;
|
|
float smallCloud = 0.0;
|
|
|
|
if(LayerIndex == ALTOSTRATUS_LAYER){
|
|
|
|
coverage = dailyWeatherParams0.z;
|
|
|
|
largeCloud = texture2D(noisetex, (position.xz + cloud_movement)/100000.).b;
|
|
smallCloud = 1.0 - texture2D(noisetex, (position.xz - cloud_movement)/7500. - vec2(1.0-largeCloud, -largeCloud)/5.0).b;
|
|
|
|
smallCloud = largeCloud + smallCloud * 0.4 * clamp(1.5-largeCloud,0.0,1.0);
|
|
|
|
float val = coverage;
|
|
shape = min(max(val - smallCloud,0.0)/sqrt(val),1.0);
|
|
shape *= shape;
|
|
|
|
return shape;
|
|
}
|
|
if(LayerIndex == LARGECUMULUS_LAYER){
|
|
coverage = dailyWeatherParams0.y;
|
|
|
|
largeCloud = texture2D(noisetex, (samplePos.zx + cloud_movement*2.0)/10000.0 * CloudLayer1_scale).b;
|
|
smallCloud = texture2D(noisetex, (samplePos.zx - cloud_movement*2.0)/2500.0 * CloudLayer1_scale).b;
|
|
|
|
smallCloud = abs(largeCloud* -0.7) + smallCloud;
|
|
|
|
float val = coverage;
|
|
shape = min(max(val - smallCloud,0.0)/sqrt(val),1.0) ;
|
|
|
|
|
|
}
|
|
if(LayerIndex == SMALLCUMULUS_LAYER){
|
|
coverage = dailyWeatherParams0.x;
|
|
|
|
largeCloud = texture2D(noisetex, (samplePos.xz + cloud_movement)/5000.0 * CloudLayer0_scale).b;
|
|
smallCloud = 1.0-texture2D(noisetex, (samplePos.xz - cloud_movement)/500.0 * CloudLayer0_scale).r;
|
|
|
|
smallCloud = abs(largeCloud-0.6) + smallCloud*smallCloud;
|
|
|
|
float val = coverage;
|
|
shape = min(max(val - smallCloud,0.0)/sqrt(val),1.0) ;
|
|
|
|
// shape = abs(largeCloud*2.0 - 1.2)*0.5 - (1.0-smallCloud);
|
|
}
|
|
|
|
// clamp density of the cloud within its upper/lower bounds
|
|
shape = min(min(shape, clamp(maxHeight - position.y,0,1)), 1.0 - clamp(minHeight - position.y,0,1));
|
|
|
|
// carve out the upper part of clouds. make sure it rounds out at its upper bound
|
|
float topShape = min(max(maxHeight-position.y,0.0) / max(maxHeight-minHeight,1.0),1.0);
|
|
topShape = min(exp(-0.5 * (1.0-topShape)), 1.0-pow(1.0-topShape,5.0));
|
|
|
|
// round out the bottom part slightly
|
|
float bottomShape = 1.0-pow(1.0-min(max(position.y-minHeight,0.0) / 25.0, 1.0), 5.0);
|
|
shape = max((shape - 1.0) + topShape * bottomShape,0.0);
|
|
|
|
/// erosion noise
|
|
if(shape > 0.001){
|
|
|
|
float erodeAmount = 0.5;
|
|
// shrink the coverage slightly so it is a similar shape to clouds with erosion. this helps cloud lighting and cloud shadows.
|
|
if (LOD < 1) return max(shape - 0.27*erodeAmount,0.0);
|
|
|
|
samplePos.xz -= cloud_movement/4.0;
|
|
|
|
// da wind
|
|
// if(LayerIndex == SMALLCUMULUS_LAYER)
|
|
samplePos.xz += pow( max(position.y - (minHeight+20.0), 0.0) / (max(maxHeight-minHeight,1.0)*0.20), 1.5);
|
|
|
|
float erosion = 0.0;
|
|
|
|
if(LayerIndex == SMALLCUMULUS_LAYER){
|
|
erosion += (1.0-densityAtPos(samplePos * 200.0 * CloudLayer0_scale)) * sqrt(1.0-shape);
|
|
|
|
float falloff = 1.0 - clamp((maxHeight - position.y)/100.0,0.0,1.0);
|
|
erosion += abs(densityAtPos(samplePos * 600.0 * CloudLayer0_scale) - falloff) * 0.75 * (1.0-shape) * (1.0-falloff*0.25);
|
|
|
|
erosion = erosion*erosion*erosion*erosion;
|
|
}
|
|
if(LayerIndex == LARGECUMULUS_LAYER){
|
|
erosion += (1.0 - densityAtPos(samplePos * 100.0 * CloudLayer1_scale)) * sqrt(1.0-shape);
|
|
|
|
float falloff = 1.0 - clamp((maxHeight - position.y)/200.0,0.0,1.0);
|
|
erosion += abs(densityAtPos(samplePos * 450.0 * CloudLayer1_scale) - falloff) * 0.75 * (1.0-shape) * (1.0-falloff*0.5);
|
|
|
|
erosion = erosion*erosion*erosion*erosion;
|
|
}
|
|
|
|
return max(shape - erosion*erodeAmount,0.0);
|
|
|
|
} else return 0.0;
|
|
|
|
}
|
|
|
|
float getPlanetShadow(vec3 playerPos, vec3 WsunVec){
|
|
float planetShadow = min(max(playerPos.y - (-100.0 + 1.0 / abs(WsunVec.y*0.1)),0.0) / 100.0, 1.0);
|
|
|
|
planetShadow = mix(pow(1.0-pow(1.0-planetShadow,2.0),2.0), 1.0, pow(abs(WsunVec.y),2.0));
|
|
|
|
return planetShadow;
|
|
}
|
|
|
|
float GetCloudShadow(vec3 playerPos, vec3 sunVector){
|
|
|
|
float totalShadow = getPlanetShadow(playerPos, sunVector);
|
|
|
|
vec3 startPosition = playerPos;
|
|
|
|
float cloudShadows = 0.0;
|
|
|
|
#ifdef CloudLayer0
|
|
startPosition = playerPos + sunVector / abs(sunVector.y) * max((CloudLayer0_height + 20.0) - playerPos.y, 0.0);
|
|
cloudShadows = getCloudShape(SMALLCUMULUS_LAYER, 0, startPosition, CloudLayer0_height, CloudLayer0_height+100.0)*dailyWeatherParams1.x;
|
|
#endif
|
|
#ifdef CloudLayer1
|
|
startPosition = playerPos + sunVector / abs(sunVector.y) * max((CloudLayer1_height + 20.0) - playerPos.y, 0.0);
|
|
cloudShadows += getCloudShape(LARGECUMULUS_LAYER, 0, startPosition, CloudLayer1_height, CloudLayer1_height+100.0)*dailyWeatherParams1.y;
|
|
#endif
|
|
#ifdef CloudLayer2
|
|
startPosition = playerPos + sunVector / abs(sunVector.y) * max(CloudLayer2_height - playerPos.y, 0.0);
|
|
cloudShadows += getCloudShape(ALTOSTRATUS_LAYER, 0, startPosition, CloudLayer2_height, CloudLayer2_height)*dailyWeatherParams1.z * (1.0-abs(WsunVec.y));
|
|
#endif
|
|
#if defined CloudLayer0 || defined CloudLayer1 || defined CloudLayer2
|
|
totalShadow *= exp((cloudShadows*cloudShadows) * -200.0);
|
|
#endif
|
|
|
|
return totalShadow;
|
|
}
|
|
|
|
#ifndef CLOUDSHADOWSONLY
|
|
|
|
float phaseCloud(float x, float g){
|
|
float gg = g * g;
|
|
return (gg * -0.25 + 0.25) * pow(-2.0 * (g * x) + (gg + 1.0), -1.5) / 3.14;
|
|
}
|
|
|
|
float getCloudScattering(
|
|
int LayerIndex,
|
|
vec3 rayPosition,
|
|
vec3 sunVector,
|
|
float dither,
|
|
float minHeight,
|
|
float maxHeight,
|
|
float density
|
|
){
|
|
int samples = 3;
|
|
int LOD = 0;
|
|
|
|
if(LayerIndex == ALTOSTRATUS_LAYER) samples = 2;
|
|
|
|
float shadow = 0.0;
|
|
vec3 shadowRayPosition = vec3(0.0);
|
|
|
|
for (int i = 0; i < samples; i++){
|
|
|
|
if(LayerIndex == ALTOSTRATUS_LAYER){
|
|
shadowRayPosition = rayPosition + sunVector * (1.0 + i * dither) / (pow(abs(sunVector.y*0.5),3.0) * 0.995 + 0.005);
|
|
}else{
|
|
shadowRayPosition = rayPosition + sunVector * (1.0 + i + dither)*20.0;
|
|
}
|
|
// float fadeddensity = density * pow(clamp((shadowRayPosition.y - minHeight)/(max(maxHeight-minHeight,1.0)*0.25),0.0,1.0),2.0);
|
|
|
|
shadow += getCloudShape(LayerIndex, LOD, shadowRayPosition, minHeight, maxHeight) * density;
|
|
}
|
|
|
|
return shadow;
|
|
}
|
|
|
|
vec3 getCloudLighting(
|
|
float shape,
|
|
float shapeFaded,
|
|
|
|
float sunShadowMask,
|
|
vec3 directLightCol,
|
|
vec3 directLightCol_multi,
|
|
|
|
float indirectShadowMask,
|
|
vec3 indirectLightCol,
|
|
|
|
float distanceFade
|
|
){
|
|
float powderEffect = 1.0 - exp(-3.0*shapeFaded);
|
|
|
|
vec3 directScattering = directLightCol * exp(-10.0*sunShadowMask) + directLightCol_multi * exp(-3.0*(sunShadowMask - (1.0-indirectShadowMask*indirectShadowMask)*0.5)) * powderEffect;
|
|
vec3 indirectScattering = indirectLightCol * mix(1.0, exp2(-5.0*shape), (indirectShadowMask*indirectShadowMask) * distanceFade);
|
|
|
|
// return indirectScattering;
|
|
// return directScattering;
|
|
return indirectScattering + directScattering;
|
|
}
|
|
|
|
vec4 raymarchCloud(
|
|
int LayerIndex,
|
|
float samples,
|
|
vec3 rayPosition,
|
|
vec3 rayDirection,
|
|
float dither,
|
|
|
|
float minHeight,
|
|
float maxHeight,
|
|
|
|
vec3 sunVector,
|
|
vec3 sunScattering,
|
|
vec3 sunMultiScattering,
|
|
vec3 skyScattering,
|
|
float distanceFade,
|
|
|
|
float referenceDistance
|
|
){
|
|
vec3 color = vec3(0.0);
|
|
float totalAbsorbance = 1.0;
|
|
|
|
float planetShadow = getPlanetShadow(rayPosition, sunVector);
|
|
sunScattering *= planetShadow;
|
|
sunMultiScattering *= planetShadow;
|
|
|
|
float distanceFactor = length(rayDirection);
|
|
|
|
if(LayerIndex == ALTOSTRATUS_LAYER){
|
|
float density = dailyWeatherParams1.z;
|
|
|
|
bool ifAboveOrBelowPlane = max(mix(-1.0, 1.0, clamp(cameraPosition.y - minHeight,0.0,1.0)) * normalize(rayDirection).y,0.0) > 0.0;
|
|
|
|
// check if the ray staring position is going farther than the reference distance, if yes, dont begin marching. this is to check for intersections with the world.
|
|
// check if the camera is above or below the cloud plane, so it doesnt waste work on the opposite hemisphere
|
|
#ifndef VL_CLOUDS_DEFERRED
|
|
if(length(rayPosition - cameraPosition) > referenceDistance || ifAboveOrBelowPlane) return vec4(color, totalAbsorbance);
|
|
#else
|
|
if(ifAboveOrBelowPlane) return vec4(color, totalAbsorbance);
|
|
#endif
|
|
|
|
float shape = getCloudShape(LayerIndex, 1, rayPosition, minHeight, maxHeight);
|
|
float shapeWithDensity = shape*density;
|
|
|
|
// check if the pixel has visible clouds before doing work.
|
|
if(shapeWithDensity > 1e-5){
|
|
// can add the initial cloud shape sample for a free shadow starting step :D
|
|
float sunShadowMask = (shapeWithDensity + getCloudScattering(LayerIndex, rayPosition, sunVector, dither, minHeight, maxHeight, density)) * (1.0-abs(WsunVec.y));
|
|
float indirectShadowMask = 0.5;
|
|
|
|
vec3 lighting = getCloudLighting(shapeWithDensity, shapeWithDensity, sunShadowMask, sunScattering, sunMultiScattering, indirectShadowMask, skyScattering, distanceFade);
|
|
|
|
float densityCoeff = exp(-distanceFactor*shapeWithDensity);
|
|
color += (lighting - lighting * densityCoeff) * totalAbsorbance;
|
|
totalAbsorbance *= densityCoeff;
|
|
}
|
|
|
|
return vec4(color, totalAbsorbance);
|
|
}
|
|
|
|
if(LayerIndex < ALTOSTRATUS_LAYER){
|
|
float density = dailyWeatherParams1.x;
|
|
|
|
if(LayerIndex == LARGECUMULUS_LAYER) density = dailyWeatherParams1.y;
|
|
|
|
float skylightOcclusion = 1.0;
|
|
#if defined CloudLayer1 && defined CloudLayer0
|
|
if(LayerIndex == SMALLCUMULUS_LAYER) {
|
|
float upperLayerOcclusion = getCloudShape(LARGECUMULUS_LAYER, 0, rayPosition + vec3(0.0,1.0,0.0) * max((CloudLayer1_height+20) - rayPosition.y,0.0), CloudLayer1_height, CloudLayer1_height+100.0);
|
|
skylightOcclusion = mix(mix(0.0,0.2,dailyWeatherParams1.y), 1.0, pow(1.0 - upperLayerOcclusion*dailyWeatherParams1.y,2));
|
|
}
|
|
|
|
skylightOcclusion = mix(1.0, skylightOcclusion, distanceFade);
|
|
#endif
|
|
|
|
for(int i = 0; i < int(samples); i++) {
|
|
|
|
// check if the ray staring position is going farther than the reference distance, if yes, dont begin marching. this is to check for intersections with the world.
|
|
#ifndef VL_CLOUDS_DEFERRED
|
|
if(length(rayPosition - cameraPosition) > referenceDistance) break;
|
|
#endif
|
|
|
|
// check if the pixel is in the bounding box before doing work.
|
|
if(clamp(rayPosition.y - maxHeight,0.0,1.0) < 1.0 && clamp(rayPosition.y - minHeight,0.0,1.0) > 0.0){
|
|
|
|
float shape = getCloudShape(LayerIndex, 1, rayPosition, minHeight, maxHeight);
|
|
float shapeWithDensity = shape*density;
|
|
float shapeWithDensityFaded = shape*density * pow(clamp((rayPosition.y - minHeight)/(max(maxHeight-minHeight,1.0)*0.25),0.0,1.0),2.0);
|
|
|
|
// check if the pixel has visible clouds before doing work.
|
|
if(shapeWithDensityFaded > 1e-5){
|
|
// can add the initial cloud shape sample for a free shadow starting step :D
|
|
float indirectShadowMask = 1.0 - min(max(rayPosition.y - minHeight,0.0) / max(maxHeight-minHeight,1.0), 1.0);
|
|
float sunShadowMask = shapeWithDensity + getCloudScattering(LayerIndex, rayPosition, sunVector, dither, minHeight, maxHeight, density);
|
|
|
|
// do cloud shadows from one layer to another
|
|
// large cumulus layer -> small cumulus layer
|
|
#if defined CloudLayer0 && defined CloudLayer1
|
|
if(LayerIndex == SMALLCUMULUS_LAYER){
|
|
vec3 shadowStartPos = rayPosition + sunVector / abs(sunVector.y) * max((CloudLayer1_height + 20.0) - rayPosition.y, 0.0);
|
|
sunShadowMask += 3.0 * getCloudShape(LARGECUMULUS_LAYER, 0, shadowStartPos, CloudLayer1_height, CloudLayer1_height+100.0)*dailyWeatherParams1.y;
|
|
}
|
|
#endif
|
|
// altostratus layer -> all cumulus layers
|
|
#if defined CloudLayer2
|
|
vec3 shadowStartPos = rayPosition + sunVector / abs(sunVector.y) * max(CloudLayer2_height - rayPosition.y, 0.0);
|
|
sunShadowMask += getCloudShape(ALTOSTRATUS_LAYER, 0, shadowStartPos, CloudLayer2_height, CloudLayer2_height) * dailyWeatherParams1.z * (1.0-abs(sunVector.y));
|
|
#endif
|
|
|
|
vec3 lighting = getCloudLighting(shapeWithDensity, shapeWithDensityFaded, sunShadowMask, sunScattering, sunMultiScattering, indirectShadowMask, skyScattering * skylightOcclusion, distanceFade);
|
|
|
|
float densityCoeff = exp(-distanceFactor*shapeWithDensityFaded);
|
|
color += (lighting - lighting * densityCoeff) * totalAbsorbance;
|
|
totalAbsorbance *= densityCoeff;
|
|
|
|
// check if you can see through the cloud on the pixel before doing the next iteration
|
|
if (totalAbsorbance < 1e-5) break;
|
|
}
|
|
}
|
|
rayPosition += rayDirection;
|
|
}
|
|
|
|
return vec4(color, totalAbsorbance);
|
|
}
|
|
|
|
}
|
|
|
|
vec3 getRayOrigin(
|
|
vec3 rayStartPos,
|
|
vec3 cameraPos,
|
|
float dither,
|
|
|
|
float minHeight,
|
|
float maxHeight
|
|
){
|
|
// allow passing through/above/below the plane without limits
|
|
float flip = mix(max(cameraPos.y - maxHeight,0.0), max(minHeight - cameraPos.y,0.0), clamp(rayStartPos.y,0.0,1.0));
|
|
|
|
// orient the ray to be a flat plane facing up/down
|
|
vec3 position = rayStartPos*dither + cameraPos + (rayStartPos/abs(rayStartPos.y)) * flip;
|
|
|
|
return position;
|
|
}
|
|
// uniform float dhFarPlane;
|
|
vec4 GetVolumetricClouds(
|
|
vec3 viewPos,
|
|
vec2 dither,
|
|
vec3 sunVector,
|
|
vec3 directLightCol,
|
|
vec3 indirectLightCol
|
|
){
|
|
#ifndef VOLUMETRIC_CLOUDS
|
|
return vec4(0.0,0.0,0.0,1.0);
|
|
#endif
|
|
|
|
vec3 color = vec3(0.0);
|
|
float totalAbsorbance = 1.0;
|
|
vec4 cloudColor = vec4(color, totalAbsorbance);
|
|
|
|
float cloudheight = CloudLayer0_tallness / CloudLayer0_scale;
|
|
float minHeight = CloudLayer0_height;
|
|
float maxHeight = cloudheight + minHeight;
|
|
|
|
float heightRelativeToClouds = clamp(1.0 - max(cameraPosition.y - minHeight,0.0) / 100.0 ,0.0,1.0);
|
|
|
|
#if defined DISTANT_HORIZONS
|
|
float maxdist = dhFarPlane;
|
|
#else
|
|
float maxdist = far + 16*5.0;
|
|
#endif
|
|
|
|
float lViewPosM = length(viewPos) < maxdist ? length(viewPos) - 1.0 : 100000000.0;
|
|
vec4 NormPlayerPos = normalize(gbufferModelViewInverse * vec4(viewPos, 1.0) + vec4(gbufferModelViewInverse[3].xyz,0.0));
|
|
|
|
vec3 signedSunVec = sunVector;
|
|
vec3 unignedSunVec = sunVector * (float(sunElevation > 1e-5)*2.0-1.0);
|
|
float SdotV = dot(unignedSunVec, NormPlayerPos.xyz);
|
|
|
|
NormPlayerPos.y += 0.025*heightRelativeToClouds;
|
|
|
|
int maxSamples = 15;
|
|
int minSamples = 10;
|
|
int samples = int(clamp(maxSamples / sqrt(exp2(NormPlayerPos.y)),0.0, minSamples));
|
|
// int samples = 30;
|
|
|
|
///------- setup the ray
|
|
vec3 rayDirection = NormPlayerPos.xyz * (cloudheight/abs(NormPlayerPos.y)/samples);
|
|
vec3 rayPosition = getRayOrigin(rayDirection, cameraPosition, dither.y, minHeight, maxHeight);
|
|
|
|
///------- do color stuff outside of the raymarcher loop
|
|
vec3 sunScattering = directLightCol * (phaseCloud(SdotV, 0.85) + phaseCloud(SdotV, 0.75)) * 3.14;
|
|
vec3 sunMultiScattering = directLightCol * 0.8;// * (phaseCloud(SdotV, 0.35) + phaseCloud(-SdotV, 0.35) * 0.5) * 6.28;
|
|
vec3 skyScattering = indirectLightCol;
|
|
|
|
vec3 distanceEstimation = normalize(NormPlayerPos.xyz * (cloudheight/abs(NormPlayerPos.y)/samples));
|
|
|
|
// terrible fake rayleigh scattering
|
|
// vec3 rC = vec3(sky_coefficientRayleighR*1e-6, sky_coefficientRayleighG*1e-5, sky_coefficientRayleighB*1e-5)*3.0;
|
|
// vec3 rayleighScatter = exp(-10000.0 * rC * exp(abs(distanceEstimation.y) * -5.0));
|
|
// sunMultiScattering *= rayleighScatter;
|
|
// sunScattering *= rayleighScatter;
|
|
|
|
float distanceFade = 1.0 - clamp(exp2(pow(abs(distanceEstimation.y),1.5) * -100.0),0.0,1.0)*heightRelativeToClouds;
|
|
// - pow(1.0-clamp(signedSunVec.y,0.0,1.0),5.0)
|
|
skyScattering *= mix(1.0, 2.0, distanceFade);
|
|
sunScattering *= distanceFade;
|
|
sunMultiScattering *= distanceFade;
|
|
|
|
////------- RENDER SMALL CUMULUS CLOUDS
|
|
vec4 smallCumulusClouds = cloudColor;
|
|
|
|
#ifdef CloudLayer0
|
|
smallCumulusClouds = raymarchCloud(SMALLCUMULUS_LAYER, samples, rayPosition, rayDirection, dither.x, minHeight, maxHeight, unignedSunVec, sunScattering, sunMultiScattering, skyScattering, distanceFade, lViewPosM);
|
|
#endif
|
|
|
|
////------- RENDER LARGE CUMULUS CLOUDS
|
|
vec4 largeCumulusClouds = cloudColor;
|
|
|
|
#ifdef CloudLayer1
|
|
cloudheight = CloudLayer1_tallness/CloudLayer1_scale;
|
|
minHeight = CloudLayer1_height;
|
|
maxHeight = cloudheight + minHeight;
|
|
|
|
rayDirection = NormPlayerPos.xyz * (cloudheight/abs(NormPlayerPos.y)/samples);
|
|
rayPosition = getRayOrigin(rayDirection, cameraPosition, dither.y, minHeight, maxHeight);
|
|
|
|
if(smallCumulusClouds.a > 1e-5) largeCumulusClouds = raymarchCloud(LARGECUMULUS_LAYER, samples, rayPosition, rayDirection, dither.x, minHeight, maxHeight, unignedSunVec, sunScattering, sunMultiScattering, skyScattering, distanceFade, lViewPosM);
|
|
#endif
|
|
|
|
////------- RENDER ALTOSTRATUS CLOUDS
|
|
vec4 altoStratusClouds = cloudColor;
|
|
|
|
#ifdef CloudLayer2
|
|
cloudheight = 5.0;
|
|
minHeight = CloudLayer2_height;
|
|
maxHeight = cloudheight + minHeight;
|
|
|
|
rayDirection = NormPlayerPos.xyz * (cloudheight/abs(NormPlayerPos.y));
|
|
rayPosition = getRayOrigin(rayDirection, cameraPosition, dither.y, minHeight, maxHeight);
|
|
|
|
if(smallCumulusClouds.a > 1e-5 || largeCumulusClouds.a > 1e-5) altoStratusClouds = raymarchCloud(ALTOSTRATUS_LAYER, samples, rayPosition, rayDirection, dither.x, minHeight, maxHeight, unignedSunVec, sunScattering, sunMultiScattering, skyScattering, distanceFade, lViewPosM);
|
|
#endif
|
|
|
|
////------- BLEND LAYERS
|
|
|
|
#ifdef CloudLayer2
|
|
cloudColor = altoStratusClouds;
|
|
#endif
|
|
#ifdef CloudLayer1
|
|
cloudColor.rgb *= largeCumulusClouds.a;
|
|
cloudColor.rgb += largeCumulusClouds.rgb;
|
|
cloudColor.a *= largeCumulusClouds.a;
|
|
#endif
|
|
#ifdef CloudLayer0
|
|
cloudColor.rgb *= smallCumulusClouds.a;
|
|
cloudColor.rgb += smallCumulusClouds.rgb;
|
|
cloudColor.a *= smallCumulusClouds.a;
|
|
#endif
|
|
|
|
color = cloudColor.rgb;
|
|
totalAbsorbance = cloudColor.a;
|
|
|
|
return vec4(color, totalAbsorbance);
|
|
}
|
|
#endif |