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      1 #version 450
      2 
      3 layout(location = 0) in vec4 samp;
      4 layout(location = 0) out vec4 color;
      5 
      6 void main()
      7 {
      8     if (gl_SamplePosition.y < 0.5)
      9         color = samp;
     10     else
     11         color = 2 * samp;
     12 }