fill_direction_vector xtlang

Defined in: https://github.com/digego/extempore/tree/v0.8.9/libs/external/opengl.xtm

Implementation

;; where v1 and v2 can be v3 or v4
;; but v3 MUST be v4
(bind-func fill_direction_vector
  (lambda (v1:float* v2:float* v3:float*)
    (let ((tmp:float* (salloc 4)))
      (vsub v1 v2 3 tmp)
      (vnorm tmp 3 v3)
      (pset! v3 3 0.0) ;; direction vectors get w = 0.0
      void)))

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