<@include gpu/Config.slh@>
<$VERSION_HEADER$>
//  Generated on <$_SCRIBE_DATE$>
//
//  simple_transparent_textured_fade.frag
//  fragment shader
//
//  Created by Olivier Prat on 06/05/17.
//  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 gpu/Color.slh@>

<@include DeferredBufferWrite.slh@>
<@include DeferredGlobalLight.slh@>
<$declareEvalGlobalLightingAlphaBlendedWithHaze()$>

<@include gpu/Transform.slh@>
<$declareStandardCameraTransform()$>

<@include Fade.slh@>

<@include render-utils/ShaderConstants.h@>

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

layout(location=RENDER_UTILS_ATTR_POSITION_ES) in vec4 _positionES;
layout(location=RENDER_UTILS_ATTR_NORMAL_WS) in vec3 _normalWS;
layout(location=RENDER_UTILS_ATTR_COLOR) in vec4 _color;
layout(location=RENDER_UTILS_ATTR_TEXCOORD01) in vec4 _texCoord01;
#define _texCoord0 _texCoord01.xy
#define _texCoord1 _texCoord01.zw
layout(location=RENDER_UTILS_ATTR_POSITION_WS) in vec4 _positionWS;

// Declare after all samplers to prevent sampler location mix up with originalTexture
<$declareFadeFragmentInstanced()$>

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

    <$fetchFadeObjectParamsInstanced(fadeParams)$>
    applyFade(fadeParams, _positionWS.xyz, fadeEmissive);

    vec4 texel = texture(originalTexture, _texCoord0.st);
    float opacity = _color.a;
    if (_color.a <= 0.0) {
        texel = color_sRGBAToLinear(texel);
        opacity = -_color.a;
    }
    opacity *= texel.a;
    vec3 albedo = _color.rgb * texel.rgb;

    vec3 fragPosition = _positionES.xyz;
    vec3 fragNormal = normalize(_normalWS);

    TransformCamera cam = getTransformCamera();

    _fragColor0 = vec4(evalGlobalLightingAlphaBlendedWithHaze(
        cam._viewInverse,
        1.0,
        1.0,
        fragPosition,
        fragNormal,
        albedo,
        DEFAULT_FRESNEL,
        0.0f,
        fadeEmissive,
        DEFAULT_ROUGHNESS,
        opacity),
        opacity);

}