OpenSpace/modules/base/shaders/sphere_fs.glsl

/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2025                                                               *
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#include "fragment.glsl"

in vec4 vs_position;
in vec2 vs_textureCoords;
in vec3 vs_normal;
in float vs_screenSpaceDepth;

uniform sampler2D colorTexture;

uniform bool usingTransferFunction = false;
uniform sampler1D transferFunction;
uniform vec2 dataMinMaxValues;

uniform float opacity;
uniform bool mirrorTexture;


Fragment getFragment() {
  vec2 texCoord = vs_textureCoords;

  Fragment frag;
  if (mirrorTexture) {
    texCoord.x = 1.0 - texCoord.x;
  }
  if (usingTransferFunction) {
    vec4 dataValue = texture(colorTexture, texCoord);
    float minVal = dataMinMaxValues.x;
    float maxVal = dataMinMaxValues.y;
    // dataValue and minVal comes from the same texture so dataValue cannot be < minVal
    float lookUpVal = (dataValue.x - minVal) / (maxVal - minVal);
    frag.color = vec4(
        texture(transferFunction, lookUpVal).rgb,
        1.0
    );
  }
  else {
    frag.color = texture(colorTexture, texCoord);
  }
  frag.color.a *= opacity;
  frag.depth = vs_screenSpaceDepth;

  // G-Buffer
  frag.gPosition = vs_position;
  frag.gNormal = vec4(vs_normal, 1.0);

  return frag;
}