<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//  model_translucent_fade.frag
//  Created by Olivier Prat on 06/05/17.
//  Copyright 2017 High Fidelity, Inc.
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE

<@include graphics/Material.slh@>
<@include DeferredGlobalLight.slh@>

<$declareEvalGlobalLightingAlphaBlendedWithHaze()$>

<@include LightLocal.slh@>
<@include gpu/Transform.slh@>
<$declareStandardCameraTransform()$>

<@include MaterialTextures.slh@>
<$declareMaterialTextures(ALBEDO, ROUGHNESS, _SCRIBE_NULL, _SCRIBE_NULL, EMISSIVE, OCCLUSION)$>

<@include Fade.slh@>
<$declareFadeFragment()$>

in vec2 _texCoord0;
in vec2 _texCoord1;
in vec4 _positionES;
in vec4 _positionWS;
in vec3 _normalWS;
in vec3 _color;
in float _alpha;

out vec4 _fragColor;

void main(void) {
    vec3 fadeEmissive;
    FadeObjectParams fadeParams;

    <$fetchFadeObjectParams(fadeParams)$>
    applyFade(fadeParams, _positionWS.xyz, fadeEmissive);

    Material mat = getMaterial();
    BITFIELD matKey = getMaterialKey(mat);
    <$fetchMaterialTexturesCoord0(matKey, _texCoord0, albedoTex, roughnessTex, _SCRIBE_NULL, _SCRIBE_NULL, emissiveTex)$>
    <$fetchMaterialTexturesCoord1(matKey, _texCoord1, occlusionTex)$>

    float opacity = getMaterialOpacity(mat) * _alpha;
    <$evalMaterialOpacity(albedoTex.a, opacity, matKey, opacity)$>;

    vec3 albedo = getMaterialAlbedo(mat);
    <$evalMaterialAlbedo(albedoTex, albedo, matKey, albedo)$>;
    albedo *= _color;

    float roughness = getMaterialRoughness(mat);
    <$evalMaterialRoughness(roughnessTex, roughness, matKey, roughness)$>;

    float metallic = getMaterialMetallic(mat);
    vec3 fresnel = getFresnelF0(metallic, albedo);

    vec3 emissive = getMaterialEmissive(mat);
    <$evalMaterialEmissive(emissiveTex, emissive, matKey, emissive)$>;

    vec3 fragPositionES = _positionES.xyz;
    vec3 fragPositionWS = _positionWS.xyz;
    // Lighting is done in world space
    vec3 fragNormalWS = normalize(_normalWS);

    TransformCamera cam = getTransformCamera();
    vec3 fragToEyeWS = cam._viewInverse[3].xyz - fragPositionWS;
    vec3 fragToEyeDirWS = normalize(fragToEyeWS);
    SurfaceData surfaceWS = initSurfaceData(roughness, fragNormalWS, fragToEyeDirWS);

    vec4 localLighting = vec4(0.0);

    <$fetchClusterInfo(_positionWS)$>;
    if (hasLocalLights(numLights, clusterPos, dims)) {
        localLighting = evalLocalLighting(cluster, numLights, fragPositionWS, surfaceWS,
                                          metallic, fresnel, albedo, 0.0,
                                          vec4(0), vec4(0), opacity);
    }

    _fragColor =  vec4(evalGlobalLightingAlphaBlendedWithHaze(
        cam._viewInverse,
        1.0,
        occlusionTex,
        fragPositionES,
        fragPositionWS,
        albedo,
        fresnel,
        metallic,
        emissive + fadeEmissive,
        surfaceWS, opacity, localLighting.rgb),
        opacity);
}