<!
//  DeferredBufferWrite.slh
//  libraries/render-utils/src
//
//  Created by Sam Gateau on 1/12/15.
//  Copyright 2013 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
!>
<@if not DEFERRED_BUFFER_WRITE_SLH@>
<@def DEFERRED_BUFFER_WRITE_SLH@>

// the glow intensity
uniform float glowIntensity;

// the alpha threshold
uniform float alphaThreshold;

float evalOpaqueFinalAlpha(float alpha, float mapAlpha) {
    return mix(alpha * glowIntensity, 1.0 - alpha * glowIntensity, step(mapAlpha, alphaThreshold));
}

const vec3 DEFAULT_SPECULAR = vec3(0.1);
const float DEFAULT_SHININESS = 10;

void packDeferredFragment(vec3 normal, float alpha, vec3 diffuse, vec3 specular, float shininess) {
    if (alpha != glowIntensity) {
        discard;
    }
    gl_FragData[0] = vec4(diffuse.rgb, alpha);
    gl_FragData[1] = vec4(normal, 0.0) * 0.5 + vec4(0.5, 0.5, 0.5, 1.0);
    gl_FragData[2] = vec4(specular, shininess / 128.0);
}

void packDeferredFragmentLightmap(vec3 normal, float alpha, vec3 diffuse, vec3 specular, float shininess, vec3 emissive) {
    if (alpha != glowIntensity) {
        discard;
    }

    gl_FragData[0] = vec4(diffuse.rgb, alpha);
    //gl_FragData[1] = vec4(normal, 0.0) * 0.5 + vec4(0.5, 0.5, 0.5, 1.0);
    gl_FragData[1] = vec4(normal, 0.0) * 0.5 + vec4(0.5, 0.5, 0.5, 0.5);
    gl_FragData[2] = vec4(emissive, shininess / 128.0);
}

void packDeferredFragmentTranslucent(vec3 normal, float alpha, vec3 diffuse, vec3 specular, float shininess) {
    if (alpha <= alphaThreshold) {
        discard;
    } 

    gl_FragData[0] = vec4(diffuse.rgb, alpha);
  //  gl_FragData[1] = vec4(normal, 0.0) * 0.5 + vec4(0.5, 0.5, 0.5, 1.0);
  //  gl_FragData[2] = vec4(specular, shininess / 128.0);
}

<@endif@>