overte-JulianGro/libraries/render-utils/src/LightDirectional.slh

//  Generated on <$_SCRIBE_DATE$>
//
//  Created by Sam Gateau on 7/5/16.
//  Copyright 2016 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
//



<@func declareLightingDirectional(supportScattering)@>
<@include DeferredLighting.slh@>

void evalLightingDirectional(out vec3 diffuse, out vec3 specular, Light light,
    vec3 eyeDir, vec3 normal, float roughness,
    float metallic, vec3 fresnel, vec3 albedo, float shadow) {
    
    vec4 shading = evalFragShading(normal, -getLightDirection(light), eyeDir, metallic, fresnel, roughness);

    diffuse = albedo * shading.w * shadow * getLightColor(light) * getLightIntensity(light);

    specular = shading.rgb * shadow * getLightColor(light) * getLightIntensity(light);
}

<@if supportScattering@>

void evalLightingDirectionalScattering(out vec3 diffuse, out vec3 specular, Light light,
    vec3 eyeDir, vec3 normal, float roughness,
    float metallic, vec3 fresnel, vec3 albedo, float shadow,
    float scattering, vec3 midNormal, vec3 lowNormal, float curvature) {

    vec3 fragLightDir = -normalize(getLightDirection(light));

    evalFragShading(diffuse, specular,
        normal, fragLightDir, eyeDir,
        metallic, fresnel, roughness,
        scattering, vec4(midNormal, curvature), vec4(lowNormal, curvature));

    vec3 lightEnergy = shadow * getLightColor(light) * getLightIntensity(light);

    diffuse *= albedo * lightEnergy;

    specular *= lightEnergy;
}

<@endif@>

<@endfunc@>