//  Generated on <$_SCRIBE_DATE$>
//
//  Created by Sam Gateau on 5/17/17.
//  Copyright 2017 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 DeferredTransform.slh@>
<$declareDeferredFrameTransform()$>

<@func evalGlobeWidget()@>
    const float SCOPE_RADIUS = 1.0;
    const float SCOPE_RADIUS2 = SCOPE_RADIUS * SCOPE_RADIUS;
    const float EDGE_HALFWIDTH = 0.025;
    const float EDGE_HALFWIDTH2 = EDGE_HALFWIDTH * EDGE_HALFWIDTH;
    const float OUT_RADIUS = SCOPE_RADIUS + EDGE_HALFWIDTH;
    
    vec2 sphereUV = (varTexCoord0.xy * 2.0 - vec2(1.0)) * OUT_RADIUS;
    float sphereR2 = dot(sphereUV.xy, sphereUV.xy);
    if (sphereR2 > OUT_RADIUS * OUT_RADIUS) {
        discard;
    }
    float sphereR = sqrt(sphereR2);

    float edgeFalloff = (SCOPE_RADIUS - sphereR) / (EDGE_HALFWIDTH);
    float edgeFalloff2 = min(1.0, edgeFalloff * edgeFalloff);

    vec4 base = vec4(0.0, 0.0, 0.0, 1.0 - edgeFalloff2);
    if (sphereR2 > SCOPE_RADIUS2) {
        _fragColor = base;
        return;
    }
<@endfunc@>