Old school 2D plasma demo effect.
Based on some old C source code found here.
Adapted from original post created on 2012-11-05.

  //Get context, precalc some variables, and create screen buffer
  //Precalc y*width values for each horizontal line
  //Precalc 256 color palette r,g,b values
  //Precalc Math.sin table
  //Main loop with optimized magic plasma color formula
  //Flip buffer to canvas

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