// This effect is a homage to the good old Compiz days. However, it is implemented      //
    // quite differently. While Compiz used a particle system, this effect uses a noise     //
    // shader. The noise is moved  vertically over time and mapped to a configurable color  //
    // gradient. It is faded to transparency towards the edges of the window. In addition,  //
    // there are a couple of moving gradients which fade-in or fade-out the fire effect.    //