int numColors = 256;
int[] preComputed = new int[numColors]{-16744602,
-16744602,
-16678810,
-16613274,
-16547482,
-16481946,
-16416154,
-16350618,
-16284826,
-16219290,
-16153498,
-16087962,
-16022170,
-15956634,
-15890842,
-15825306,
-15759514,
-15693978,
-15628186,
-15562650,
-15496858,
-15431322,
-15365530,
-15299994,
-15234202,
-15168666,
-15102874,
-15037338,
-14971546,
-14906010,
-14840218,
-14774682,
-14708890,
-14643354,
-14577562,
-14512026,
-14446234,
-14380698,
-14314906,
-14249370,
-14183578,
-14118042,
-14052250,
-13986714,
-13920922,
-13855386,
-13789594,
-13724058,
-13658266,
-13592730,
-13526938,
-13461402,
-13395610,
-13330074,
-13264282,
-13198746,
-13132954,
-13067418,
-13001626,
-12936090,
-12870298,
-12804762,
-12738970,
-12673434,
-12607642,
-12542106,
-12476314,
-12410778,
-12344986,
-12279450,
-12213658,
-12148122,
-12082330,
-12016794,
-11951002,
-11885466,
-11819674,
-11754138,
-11688346,
-11622810,
-11557018,
-11491482,
-11425690,
-11360154,
-11294362,
-11228826,
-11163034,
-11097498,
-11031706,
-10966170,
-10900378,
-10834842,
-10769050,
-10703514,
-10637722,
-10572186,
-10506394,
-10440858,
-10375066,
-10309530,
-10243738,
-10178202,
-10112410,
-10046874,
-9981082,
-9915546,
-9849754,
-9784218,
-9718426,
-9652890,
-9587098,
-9521562,
-9455770,
-9390234,
-9324442,
-9258906,
-9193114,
-9127578,
-9061786,
-8996250,
-8930458,
-8864922,
-8799130,
-8733594,
-8667802,
-8602266,
-8536474,
-8470938,
-8339610,
-8273818,
-8208282,
-8142490,
-8076954,
-8011162,
-7945626,
-7879834,
-7814298,
-7748506,
-7682970,
-7617178,
-7551642,
-7485850,
-7420314,
-7354522,
-7288986,
-7223194,
-7157658,
-7091866,
-7026330,
-6960538,
-6895002,
-6829210,
-6763674,
-6697882,
-6632346,
-6566554,
-6501018,
-6435226,
-6369690,
-6303898,
-6238362,
-6172570,
-6107034,
-6041242,
-5975706,
-5909914,
-5844378,
-5778586,
-5713050,
-5647258,
-5581722,
-5515930,
-5450394,
-5384602,
-5319066,
-5253274,
-5187738,
-5121946,
-5056410,
-4990618,
-4925082,
-4859290,
-4793754,
-4727962,
-4662426,
-4596634,
-4531098,
-4465306,
-4399770,
-4333978,
-4268442,
-4202650,
-4137114,
-4071322,
-4005786,
-3939994,
-3874458,
-3808666,
-3743130,
-3677338,
-3611802,
-3546010,
-3480474,
-3414682,
-3349146,
-3283354,
-3217818,
-3152026,
-3086490,
-3020698,
-2955162,
-2889370,
-2823834,
-2758042,
-2692506,
-2626714,
-2561178,
-2495386,
-2429850,
-2364058,
-2298522,
-2232730,
-2167194,
-2101402,
-2035866,
-1970074,
-1904538,
-1838746,
-1773210,
-1707418,
-1641882,
-1576090,
-1510554,
-1444762,
-1379226,
-1313434,
-1247898,
-1182106,
-1116570,
-1050778,
-985242,
-919450,
-853914,
-788122,
-722586,
-656794,
-591258,
-525466,
-459930,
-394138,
-328602,
-262810,
-197274,
-131482,
-65946,
-154};

private void setLutTexture() {
  int lutTextureID = glGenTextures();
  glActiveTexture(GL_TEXTURE2);
  glBindTexture(GL_TEXTURE_1D, lutTextureID);
  glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA32I, numColors, 0, GL_RGBA, GL_INT, getPreComputedBuffer());
  glBindTexture(GL_TEXTURE_1D, 0);
}

public int[] getPreComputedBuffer() {
  int[] buffer = new int[this.numColors*4];
  int pixelIndex = 0;
  for (int i = 0; i < numColors; i++) {
    int[] rgba = intToRGBAInts(preComputed[i]);
    buffer[pixelIndex] = rgba[0];
    buffer[pixelIndex + 1] = rgba[1];
    buffer[pixelIndex + 2] = rgba[2];
    buffer[pixelIndex + 3] = rgba[3];
    pixelIndex += 4;
  }
  return buffer;
}

public int[] intToRGBAInts (int rgba) {
  int alpha = (rgba >> 24) & 0xFF;
  int red = (rgba >> 16) & 0xFF;
  int green = (rgba >> 8) & 0xFF;
  int blue = (rgba) & 0xFF;
  return new int[]{red, green, blue, alpha};
}