//  Generated on <$_SCRIBE_DATE$>////  Created by Olivier Prat on 15/01/18.//  Copyright 2018 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// // Everything about light<@include graphics/Light.slh@><@include LightingModel.slh@><@include LightPoint.slh@><@include LightSpot.slh@><@include LightClusterGrid.slh@> <$declareLightBuffer(256)$><$declareLightingPoint(supportScattering)$><$declareLightingSpot(supportScattering)$> vec4 evalLocalLighting(ivec3 cluster, int numLights, vec3 fragWorldPos, SurfaceData surface,                       float fragMetallic, vec3 fragFresnel, vec3 fragAlbedo, float fragScattering,                         vec4 midNormalCurvature, vec4 lowNormalCurvature, float opacity) {    vec4 fragColor = vec4(0.0);    vec3 fragSpecular = vec3(0.0);    vec3 fragDiffuse = vec3(0.0);    int lightClusterOffset = cluster.z;     // Compute the rougness into gloss2 once:    bool withScattering = (fragScattering * isScatteringEnabled() > 0.0);     int numLightTouching = 0;    for (int i = 0; i < cluster.x; i++) {        // Need the light now        int theLightIndex = clusterGrid_getClusterLightId(i, lightClusterOffset);        Light light = getLight(theLightIndex);         // Clip againgst the light volume and Make the Light vector going from fragment to light center in world space        vec4 fragLightVecLen2;        vec4 fragLightDirLen;         if (!lightVolume_clipFragToLightVolumePoint(light.volume, fragWorldPos.xyz, fragLightVecLen2)) {            continue;        }         // Allright we re in the light sphere volume        fragLightDirLen.w = length(fragLightVecLen2.xyz);        fragLightDirLen.xyz = fragLightVecLen2.xyz / fragLightDirLen.w;        if (dot(surface.normal, fragLightDirLen.xyz) < 0.0) {            continue;        }         numLightTouching++;         vec3 diffuse = vec3(1.0);        vec3 specular = vec3(0.1);         // Allright we re valid in the volume        float fragLightDistance = fragLightDirLen.w;        vec3 fragLightDir = fragLightDirLen.xyz;         updateSurfaceDataWithLight(surface, fragLightDir);         // Eval attenuation        float radialAttenuation = lightIrradiance_evalLightAttenuation(light.irradiance, fragLightDistance);        vec3 lightEnergy = radialAttenuation * getLightIrradiance(light);         // Eval shading        if (withScattering) {            evalFragShadingScattering(diffuse, specular, fragMetallic, fragFresnel, surface, fragAlbedo,                                      fragScattering, midNormalCurvature, lowNormalCurvature );        } else {           evalFragShadingGloss(diffuse, specular, fragMetallic, fragFresnel, surface, fragAlbedo);        }         diffuse *= lightEnergy;        specular *= lightEnergy;         fragDiffuse.rgb += diffuse;        fragSpecular.rgb += specular;    }     for (int i = cluster.x; i < numLights; i++) {        // Need the light now        int theLightIndex = clusterGrid_getClusterLightId(i, lightClusterOffset);        Light light = getLight(theLightIndex);         // Clip againgst the light volume and Make the Light vector going from fragment to light center in world space        vec4 fragLightVecLen2;        vec4 fragLightDirLen;        float cosSpotAngle;         if (!lightVolume_clipFragToLightVolumePoint(light.volume, fragWorldPos.xyz, fragLightVecLen2)) {            continue;        }         // Allright we re in the light sphere volume        fragLightDirLen.w = length(fragLightVecLen2.xyz);        fragLightDirLen.xyz = fragLightVecLen2.xyz / fragLightDirLen.w;        if (dot(surface.normal, fragLightDirLen.xyz) < 0.0) {            continue;        }         // Check spot        if (!lightVolume_clipFragToLightVolumeSpotSide(light.volume, fragLightDirLen, cosSpotAngle)) {            continue;        }         numLightTouching++;         vec3 diffuse = vec3(1.0);        vec3 specular = vec3(0.1);         // Allright we re valid in the volume        float fragLightDistance = fragLightDirLen.w;        vec3 fragLightDir = fragLightDirLen.xyz;         updateSurfaceDataWithLight(surface, fragLightDir);         // Eval attenuation        float radialAttenuation = lightIrradiance_evalLightAttenuation(light.irradiance, fragLightDistance);        float angularAttenuation = lightIrradiance_evalLightSpotAttenuation(light.irradiance, cosSpotAngle);        vec3 lightEnergy = radialAttenuation * angularAttenuation * getLightIrradiance(light);         // Eval shading        if (withScattering) {            evalFragShadingScattering(diffuse, specular, fragMetallic, fragFresnel, surface, fragAlbedo,                                      fragScattering, midNormalCurvature, lowNormalCurvature );        } else {           evalFragShadingGloss(diffuse, specular, fragMetallic, fragFresnel, surface, fragAlbedo);        }         diffuse *= lightEnergy;        specular *= lightEnergy;         fragDiffuse.rgb += diffuse;        fragSpecular.rgb += specular;    }     fragDiffuse *= isDiffuseEnabled();    fragSpecular *= isSpecularEnabled();     fragColor.rgb += fragDiffuse;    fragColor.rgb += evalSpecularWithOpacity(fragSpecular, opacity);    return fragColor;}