<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  directional_skybox_light_shadow.frag
//  fragment shader
//
//  Created by Zach Pomerantz on 1/18/2016.
//  Copyright 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
//!>

<@include Shadow.slh@>
<@include DeferredBufferRead.slh@>
<@include DeferredGlobalLight.slh@>
<@include render-utils/ShaderConstants.h@>

<$declareEvalLightmappedColor()$>
<$declareEvalSkyboxGlobalColor(isScattering)$>

layout(location=RENDER_UTILS_ATTR_TEXCOORD01) in vec4 _texCoord01;
#define _texCoord0 _texCoord01.xy
#define _texCoord1 _texCoord01.zw
layout(location=0) out vec4 _fragColor;

void main(void) {
    DeferredFrameTransform deferredTransform = getDeferredFrameTransform();
    DeferredFragment frag = unpackDeferredFragment(deferredTransform, _texCoord0);

    vec4 viewPos = vec4(frag.position.xyz, 1.0);
    vec4 worldPos = getViewInverse() * viewPos;
    Light shadowLight = getKeyLight();
    vec3 worldLightDirection = getLightDirection(shadowLight);
    float shadowAttenuation = evalShadowAttenuation(worldLightDirection, worldPos, -viewPos.z, frag.normal);

    // Light mapped or not ?
    if (frag.mode == FRAG_MODE_UNLIT) {
        discard;
    } else if (frag.mode == FRAG_MODE_LIGHTMAPPED) {
        discard;
    } else {
        vec4 midNormalCurvature = vec4(0);
        vec4 lowNormalCurvature = vec4(0);
        if (frag.mode == FRAG_MODE_SCATTERING) {
            unpackMidLowNormalCurvature(_texCoord0, midNormalCurvature, lowNormalCurvature);
        }
        vec3 color =  evalSkyboxGlobalColor(
                        getViewInverse(),
                        shadowAttenuation,
                        frag.obscurance,
                        frag.position.xyz,
                        frag.normal,
                        frag.albedo,
                        frag.fresnel,
                        frag.metallic,
                        frag.roughness,
                        frag.scattering,
                        midNormalCurvature,
                        lowNormalCurvature);


        _fragColor = vec4(color, 1.0);
    }
}