Method: CGLM::Mat4#equalish

Defined in:
ext/cglm/rb_cglm_mat4.c

#=~(b) ⇒ Object Also known as: =~

Returns true if each member of a is very close to, but not necessarily exactly equal to, each corresponding member of b. This is useful in many circumstances because imprecision introduced by floating point calculations can lead to two expressions which are otherwise mathematically equivalent returning false.



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# File 'ext/cglm/rb_cglm_mat4.c', line 234

VALUE rb_cglm_mat4_equalish(int argc, VALUE *argv, VALUE self) {
  VALUE other, epsilon;
  float feps = FLT_EPSILON;
  rb_scan_args(argc, argv, "11", &other, &epsilon);
  if (!NIL_P(epsilon)) feps = NUM2FLT(epsilon);
  mat4 *a = &VAL2MAT4(self);
  mat4 *b = &VAL2MAT4(other);
  for (int i = 0; i < 4; i++) {
    for (int j = 0; j < 4; j++) {
      if (fabsf((*a)[i][j] - (*b)[i][j]) > feps)
        return Qfalse;
    }
  }
  return Qtrue;
}