<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  Created by Bradley Austin Davis on 2016/07/05
//  Copyright 2013-2016 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
//

in vec4 _color;

in float distanceFromCenter;
out vec4 _fragColor;

void main(void) {
    // The incoming value actually ranges from -1 to 1, so modify it 
    // so that it goes from 0 -> 1 -> 0 with the solid alpha being at 
    // the center of the line
    float alpha = 1.0 - abs(distanceFromCenter);
    
    // Convert from a linear alpha curve to a sharp peaked one
	alpha = _color.a * pow(alpha, 10.0);
	
	// Drop everything where the curve falls off to nearly nothing
    if (alpha <= 0.05) {
        discard;
    }
    
    // Emit the color
    _fragColor = vec4(_color.rgb, alpha);
}