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May 7th, 2018
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  1. _check_shear:
  2.         bit MFB_SHEAR,b
  3.         jp z,_docheck
  4.        
  5.         ; TODO use rotation rather than shearing
  6.         ; note: this will need a LUT.
  7.        
  8.         ld a,e
  9.         sra a
  10.         add a,d
  11.         ld d,a
  12.        
  13.         call _docheck
  14.        
  15.         ld a,e
  16.         sra a
  17.         sub d
  18.         neg
  19.         ld d,a
  20.        
  21.         ret
  22.    
  23.     _docheck:
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