<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  local_lights_shading.frag
//  fragment shader
//
//  Created by Sam Gateau on 9/6/2016.
//  Copyright 2014 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
//

// Everything about deferred buffer
<@include DeferredBufferRead.slh@>

<$declareDeferredCurvature()$>

<@include LightLocal.slh@>

in vec2 _texCoord0;
out vec4 _fragColor;

void main(void) {
    _fragColor = vec4(0.0);

    // Grab the fragment data from the uv
    vec2 texCoord = _texCoord0.st;

    DeferredFrameTransform deferredTransform = getDeferredFrameTransform();
    DeferredFragment frag = unpackDeferredFragment(deferredTransform, texCoord);
    vec4 fragPosition = frag.position;

    if (frag.mode == FRAG_MODE_UNLIT) {
        discard;
    }

    // Frag pos in world
    mat4 invViewMat = getViewInverse();
    vec4 fragWorldPos = invViewMat * fragPosition;

    <$fetchClusterInfo(fragWorldPos)$>;
    if (!hasLocalLights(numLights, clusterPos, dims)) {
        discard;
    }

    vec4 midNormalCurvature = vec4(0);
    vec4 lowNormalCurvature = vec4(0);
    if (frag.mode == FRAG_MODE_SCATTERING) {
        unpackMidLowNormalCurvature(texCoord, midNormalCurvature, lowNormalCurvature);
    }


    // Frag to eye vec
    vec4 fragEyeVector = invViewMat * vec4(-frag.position.xyz, 0.0);
    vec3 fragEyeDir = normalize(fragEyeVector.xyz);
    SurfaceData surface = initSurfaceData(frag.roughness, frag.normal, fragEyeDir);

    _fragColor = evalLocalLighting(cluster, numLights, fragWorldPos.xyz, surface, 
                                   frag.metallic, frag.fresnel, frag.albedo, frag.scattering, 
                                   midNormalCurvature, lowNormalCurvature, 1.0);

}