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Add a note about [0, 0, 0] and cogl_vector3_normalize()

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When having the [0, 0, 0] vector, normalize() won't try to divide by 0
and thus it's always safe to use that funtion.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit 64370e7ddd32f25556a1792c00d14adc48a81d45)
This commit is contained in:
Damien Lespiau 2012-05-30 14:40:09 +01:00 committed by Robert Bragg
parent 5a36ce4f43
commit a87b657d73
1 changed files with 4 additions and 0 deletions
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4
cogl/cogl-vector.h
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@ -233,6 +233,10 @@ cogl_vector3_divide_scalar (float *vector,
* Updates the vector so it is a "unit vector" such that the * Updates the vector so it is a "unit vector" such that the
* @vector<!-- -->s magnitude or length is equal to 1. * @vector<!-- -->s magnitude or length is equal to 1.
* *
* <note>It's safe to use this function with the [0, 0, 0] vector, it will not
* try to divide components by 0 (its norm) and will leave the vector
* untouched.</note>
*
* Since: 1.4 * Since: 1.4
* Stability: Unstable * Stability: Unstable
*/ */