/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2023                                                               *
 *                                                                                       *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
 * software and associated documentation files (the "Software"), to deal in the Software *
 * without restriction, including without limitation the rights to use, copy, modify,    *
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to    *
 * permit persons to whom the Software is furnished to do so, subject to the following   *
 * conditions:                                                                           *
 *                                                                                       *
 * The above copyright notice and this permission notice shall be included in all copies *
 * or substantial portions of the Software.                                              *
 *                                                                                       *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,   *
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT    *
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF  *
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE  *
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
 ****************************************************************************************/

#include "fragment.glsl"
#include "PowerScaling/powerScaling_fs.hglsl"

in vec2 vs_st;
in vec4 vs_position;

uniform sampler2D texture1;
uniform float OcclusionDepth;
uniform float Alpha;


Fragment getFragment() {
  Fragment frag;

  // power scale coordinates for depth. w value is set to 1.0.
  float depth = (1.0 + log(abs(OcclusionDepth) + 1/pow(k, 1.0))/log(k)) / 27.0;
  frag.color = texture(texture1, vec2(vs_st.s, vs_st.t));
  frag.color.a = (frag.color.a != 0.0f) ? Alpha : frag.color.a;
  if (frag.color.a == 0.0f){
    discard;
  }

  frag.depth = denormalizeFloat(depth);

  return frag;
}
