<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  model_normal_map.frag
//  fragment shader
//
//  Created by Andrzej Kapolka on 10/29/13.
//  Copyright 2013 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 model/Material.slh@>

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

in vec4 _position;
in vec2 _texCoord0;
in vec3 _normal;
in vec3 _tangent;
in vec3 _color;

void main(void) {
    Material mat = getMaterial();
    int matKey = getMaterialKey(mat);
    <$fetchMaterialTextures(matKey, _texCoord0, albedoTex, roughnessTex, normalTex, _SCRIBE_NULL, emissiveTex, occlusionTex)$>

    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);
    <$evalMaterialEmissive(emissiveTex, emissive, matKey, emissive)$>;

    vec3 viewNormal;
    <$tangentToViewSpace(normalTex, _normal, _tangent, viewNormal)$>

    packDeferredFragment(
        viewNormal, 
        opacity,
        albedo,
        roughness,
        getMaterialMetallic(mat),
        emissive,
        occlusionTex);
}