OpenSpace/modules/digitaluniverse/shaders/billboard_fs.glsl

/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2023                                                               *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
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 * or substantial portions of the Software.                                              *
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 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
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#include "fragment.glsl"

flat in vec4 gs_colorMap;
flat in float vs_screenSpaceDepth;
in vec2 texCoord;
in float ta;

uniform float alphaValue;
uniform vec3 color;
uniform sampler2D spriteTexture;
uniform bool hasColorMap;
uniform bool useColorMap;
uniform float fadeInValue;


Fragment getFragment() {
  if (gs_colorMap.a == 0.0 || ta == 0.0 || fadeInValue == 0.0 || alphaValue == 0.0) {
    discard;
  }

  vec4 textureColor = texture(spriteTexture, texCoord);
  if (textureColor.a == 0.0) {
    discard;
  }

  vec4 fullColor = textureColor;

  if (hasColorMap && useColorMap) {
    fullColor *= gs_colorMap;
  }
  else {
    fullColor.rgb *= color;
  }

  float textureOpacity = dot(fullColor.rgb, vec3(1.0));
  if (textureOpacity == 0.0) {
    discard;
  }

  fullColor.a *= alphaValue * fadeInValue * ta;

  Fragment frag;
  frag.color = fullColor;
  frag.depth = vs_screenSpaceDepth;
  // Setting the position of the billboards to not interact with the ATM
  frag.gPosition = vec4(-1e32, -1e32, -1e32, 1.0);
  frag.gNormal = vec4(0.0, 0.0, 0.0, 1.0);

  return frag;
}