<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  Created by Sam Gateau on 5/16/17.
//  Copyright 2017 High Fidelity, Inc.
//  Copyright 2024 Overte e.V.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
<@include zone_draw.slh@>

<@include graphics/Light.slh@>

<@include LightingModel.slh@>
<$declareLightAmbientBuffer()$>

<@include LightAmbient.slh@>

<$declareLightingAmbient(_SCRIBE_NULL, 1, _SCRIBE_NULL, _SCRIBE_NULL)$>

layout(location=0) in vec2 varTexCoord0;
layout(location=0) out vec4 _fragColor;

void main(void) {

    <$evalGlobeWidget()$>

    vec3 spherePos = normalize(vec3(sphereUV, sqrt(1.0 - sphereR2)));


    vec3 fragNormal = vec3(getViewInverse(getStereoSideFromFragCoord()) * vec4(spherePos, 0.0));


    LightAmbient lightAmbient = getLightAmbient();


    float roughness = 0.1;
    float levels = getLightAmbientMapNumMips(lightAmbient);
    float lod = min(((roughness)* levels), levels);
    vec3 ambientMap = evalSkyboxLight(fragNormal, lod).xyz;
    vec3 ambientSH = sphericalHarmonics_evalSphericalLight(getLightAmbientSphere(lightAmbient), fragNormal).xyz;

    // _fragColor = vec4( 0.5  * (fragNormal + vec3(1.0)), 1.0);

    vec3 color = mix(ambientSH, ambientMap, float(sphereUV.x > 0.0));
    color = applySkyboxColorMix(color, getLightAmbientColor(lightAmbient), getLightAmbientBlend(lightAmbient));

    color = color * 1.0 - base.w + base.xyz * base.w;
    const float INV_GAMMA_22 = 1.0 / 2.2;
    _fragColor = vec4(pow(color, vec3(INV_GAMMA_22)), 1.0);
}