<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  forward_simple.frag
//  fragment shader
//
//  Created by Andrzej Kapolka on 9/15/14.
//  Copyright 2014 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 DefaultMaterials.slh@>

<@include ForwardGlobalLight.slh@>
<$declareEvalSkyboxGlobalColor()$>

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

// the interpolated normal
layout(location=RENDER_UTILS_ATTR_NORMAL_WS) in vec3 _normalWS;
layout(location=RENDER_UTILS_ATTR_NORMAL_MS) in vec3 _normalMS;
layout(location=RENDER_UTILS_ATTR_COLOR) in vec4 _color;
layout(location=RENDER_UTILS_ATTR_TEXCOORD01) in vec4 _texCoord01;
#define _texCoord0 _texCoord01.xy
#define _texCoord1 _texCoord01.zw
layout(location=RENDER_UTILS_ATTR_POSITION_MS) in vec4 _positionMS;
layout(location=RENDER_UTILS_ATTR_POSITION_ES) in vec4 _positionES;

// For retro-compatibility
#define _normal      _normalWS
#define _modelNormal _normalMS
#define _position    _positionMS
#define _eyePosition _positionES

layout(location=0) out vec4 _fragColor0;

void main(void) {
    vec3 normal = normalize(_normalWS.xyz);
    vec3 diffuse = _color.rgb;
    vec3 specular = DEFAULT_SPECULAR;
    float shininess = DEFAULT_SHININESS;
    float emissiveAmount = 0.0;

    TransformCamera cam = getTransformCamera();
    vec3 fragPosition = _positionES.xyz;

    _fragColor0 = vec4(evalSkyboxGlobalColor(
        cam._viewInverse,
        1.0,
        DEFAULT_OCCLUSION,
        fragPosition,
        normal * (2.0 * float(gl_FrontFacing) - 1.0),
        diffuse,
        DEFAULT_FRESNEL,
        length(specular),
        max(0.0, 1.0 - shininess / 128.0)),
        1.0);
}