arrows_set_head_vert   xtlang


Defined in:  https://github.com/digego/extempore/tree/v0.8.9/examples/external/shader-tutorials/arrows.xtm

Implementation

(bind-func arrows_set_head_vert
  (lambda (x y headxval headyval)
    (let ((idx (* (+ (* x grid_size_y) y) 4)))
      (pset! arrows_verts
             (+ idx 2)
             (+ (pref arrows_verts idx) headxval))
      (pset! arrows_verts
             (+ idx 3)
             (+ (pref arrows_verts (+ idx 1)) headyval)))))


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