/**
* graphene_vec3_normalize:
* @v: a #graphene_vec3_t
* @res: (out caller-allocates): return location for the normalized vector
*
* Normalizes the given #graphene_vec3_t.
*
* Since: 1.0
*/
void
graphene_vec3_normalize (const graphene_vec3_t *v,
graphene_vec3_t *res)
{
if (graphene_vec3_length (v) != 0.f)
res->value = graphene_simd4f_normalize3 (v->value);
else
res->value = graphene_simd4f_init_zero ();
}
/**
* graphene_quaternion_init_from_angle_vec3:
* @q: a #graphene_quaternion_t
* @angle: the rotation on a given axis, in degrees
* @axis: the axis of rotation, expressed as a vector
*
* Initializes a #graphene_quaternion_t using an @angle on a
* specific @axis.
*
* Returns: (transfer none): the initialized quaternion
*
* Since: 1.0
*/
graphene_quaternion_t *
graphene_quaternion_init_from_angle_vec3 (graphene_quaternion_t *q,
float angle,
const graphene_vec3_t *axis)
{
float rad, sin_a, cos_a;
graphene_simd4f_t axis_n;
rad = GRAPHENE_DEG_TO_RAD (angle);
sin_a = sinf (rad / 2.f);
cos_a = cosf (rad / 2.f);
axis_n = graphene_simd4f_mul (graphene_simd4f_normalize3 (axis->value),
graphene_simd4f_splat (sin_a));
q->x = graphene_simd4f_get_x (axis_n);
q->y = graphene_simd4f_get_y (axis_n);
q->z = graphene_simd4f_get_z (axis_n);
q->w = cos_a;
return q;
}
