/*****************************************************************************************
 *                                                                                       *
 * 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"

flat in float vs_screenSpaceDepth;
in vec4 vs_positionViewSpace;
flat in vec3 vs_normal; // TODO: not needed for shading, remove somehow
in vec2 texCoord;

uniform sampler2D pointTexture;
uniform bool hasTexture;
uniform vec3 color;
uniform float opacity;

// Can be used to preserve the whites in a point texture
bool preserveWhite = true;

Fragment getFragment() {
  Fragment frag;

  if (hasTexture) {
    frag.color = texture(pointTexture, texCoord);
    if (!preserveWhite || frag.color.r * frag.color.g * frag.color.b < 0.95) {
      frag.color.rgb *= color;
    }
    frag.color.a *= opacity;
  }
  else {
    frag.color = vec4(color * vs_normal, opacity);
  }

  if (frag.color.a < 0.01) {
    discard;
  }

  frag.depth = vs_screenSpaceDepth;
  frag.gPosition = vs_positionViewSpace;
  frag.gNormal = vec4(0.0, 0.0, 0.0, 1.0);
  return frag;
}
