// START of parameters

  // gamma of simulated CRT
  CRTgamma = 2.4;
  // gamma of display monitor (typically 2.2 is correct)
  monitorgamma = 2.2;
  // overscan (e.g. 1.02 for 2% overscan)
  overscan = vec2(0.98,0.98);
  // aspect ratio
  aspect = vec2(1.0, 0.75);
  // lengths are measured in units of (approximately) the width of the monitor
  // simulated distance from viewer to monitor
  d = 2.0;
  // radius of curvature
  R = 3.5;
  // tilt angle in radians
  // (behavior might be a bit wrong if both components are nonzero)
  const vec2 angle = vec2(-0.60,0.0);
  // size of curved corners
  cornersize = 0.03;
  // border smoothness parameter
  // decrease if borders are too aliased
  cornersmooth = 1000.0;

  // END of parameters

  // Do the standard vertex processing.
  gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

  // Precalculate a bunch of useful values we'll need in the fragment
  // shader.
  sinangle = sin(angle);
  cosangle = cos(angle);
  stretch = maxscale();

  // Texture coords.
  texCoord = gl_MultiTexCoord0.xy;

  // The size of one texel, in texture-coordinates.
  one = 1.0 / color_texture_pow2_sz;
}