<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  paintStroke_fade.frag
//  fragment shader
//
//  Created by Olivier Prat on 19/07/17.
//  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 DeferredBufferWrite.slh@>

<@include Fade.slh@>
<$declareFadeFragment()$>

// the albedo texture
layout(binding=0) uniform sampler2D originalTexture;

// the interpolated normal
layout(location=0) in vec3 interpolatedNormal;
layout(location=1) in vec2 varTexcoord;
layout(location=2) in vec4 varColor;
layout(location=3) in vec4 _worldPosition;

struct PolyLineUniforms {
    vec3 color;
};

layout(binding=0) uniform polyLineBuffer {
    PolyLineUniforms polyline;
};

void main(void) {
    vec3 fadeEmissive;
    FadeObjectParams fadeParams;

    <$fetchFadeObjectParams(fadeParams)$>
    applyFade(fadeParams, _worldPosition.xyz, fadeEmissive);
    
    vec4 texel = texture(originalTexture, varTexcoord);
    int frontCondition = 1 -int(gl_FrontFacing) * 2;
    vec3 color = varColor.rgb;
    packDeferredFragmentTranslucent(
        interpolatedNormal * float(frontCondition),
        texel.a * varColor.a,
        polyline.color * texel.rgb + fadeEmissive,
        vec3(0.01, 0.01, 0.01),
        10.0);
}