<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//  sdf_text3D_transparent.frag
//  fragment shader
//
//  Created by Bradley Austin Davis on 2015-02-04
//  Based on fragment shader code from 
//  https://github.com/paulhoux/Cinder-Samples/blob/master/TextRendering/include/text/Text.cpp 
//  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@>
<$declareStandardCameraTransform()$>

<@include render-utils/ShaderConstants.h@>

<@include sdf_text3D.slh@>
<$declareEvalSDFSuperSampled()$>

layout(location=RENDER_UTILS_ATTR_POSITION_ES) in vec4 _positionES;
layout(location=RENDER_UTILS_ATTR_NORMAL_WS) in vec3 _normalWS;
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=0) out vec4 _fragColor0;

void main() {
    float a = evalSDFSuperSampled(_texCoord0);

    float alpha = a * _color.a;
    if (alpha <= 0.0) {
        discard;
    }

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

    _fragColor0 = vec4(evalSkyboxGlobalColor(
        cam._viewInverse,
        1.0,
        DEFAULT_OCCLUSION,
        fragPosition,
        normalize(_normalWS),
        _color.rgb,
        DEFAULT_FRESNEL,
        DEFAULT_METALLIC,
        DEFAULT_ROUGHNESS),
        1.0);
}