<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//  fragment shader
//
//  Created by Bradley Austin Davis on 6/10/15.
//  Copyright 2015 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 varColor;
in float varSize;

out vec4 outFragColor;

const float EDGE_SIZE = 0.25;
const float ALPHA_BOUNDARY = 1.0 - EDGE_SIZE;

void main(void) {
    vec2 coord = gl_PointCoord * vec2(2.0) - vec2(1.0);
    coord = coord * coord;

    float l = coord.x + coord.y;
    if (l > 1.0) {
        discard;
    }
    
    outFragColor = varColor; 
    if (l >= ALPHA_BOUNDARY) {
        outFragColor.a = smoothstep(1.0, ALPHA_BOUNDARY, l);
    }
}