<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  model_fade.frag
//  fragment shader
//
//  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 or http://www.apache.org/licenses/LICENSE-2.0.html
//

<@include DeferredBufferWrite.slh@>

<@include graphics/Material.slh@>

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

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

in vec2 _texCoord0;
in vec2 _texCoord1;
in vec3 _normalWS;
in vec3 _color;
in vec4 _positionWS;

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

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

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

    float opacity = 1.0;
    <$evalMaterialOpacity(albedoTex.a, opacity, matKey, opacity)$>;
    <$discardTransparent(opacity)$>;

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

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

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

    float metallic = getMaterialMetallic(mat);
    <$evalMaterialMetallic(metallicTex, metallic, matKey, metallic)$>;

    float scattering = getMaterialScattering(mat);

    packDeferredFragment(
        normalize(_normalWS), 
        opacity,
        albedo,
        roughness,
        metallic,
        emissive+fadeEmissive,
        occlusionTex,
        scattering);
}