/**
* graphene_vec3_near:
* @v1: a #graphene_vec3_t
* @v2: a #graphene_vec3_t
* @epsilon: the threshold between the two vectors
*
* Compares the two given #graphene_vec3_t vectors and checks
* whether their values are within the given @epsilon.
*
* Returns: `true` if the two vectors are near each other
*
* Since: 1.2
*/
bool
graphene_vec3_near (const graphene_vec3_t *v1,
const graphene_vec3_t *v2,
float epsilon)
{
float epsilon_sq = epsilon * epsilon;
graphene_simd4f_t d;
if (v1 == v2)
return true;
if (v1 == NULL || v2 == NULL)
return false;
d = graphene_simd4f_sub (v1->value, v2->value);
return graphene_simd4f_get_x (graphene_simd4f_dot3 (d, d)) < epsilon_sq;
}
/**
* graphene_simd4f_dot3:
* @a: a #graphene_simd4f_t
* @b: a #graphene_simd4f_t
*
* Computes the dot product of the first three components of the
* two given #graphene_simd4f_t.
*
* Returns: a vector whose components are all set to the
* dot product of the components of the two operands
*
* Since: 1.0
*/
graphene_simd4f_t
(graphene_simd4f_dot3) (const graphene_simd4f_t a,
const graphene_simd4f_t b)
{
return graphene_simd4f_dot3 (a, b);
}
/**
* graphene_vec3_dot:
* @a: a #graphene_vec3_t
* @b: a #graphene_vec3_t
*
* Computes the dot product of the two given vectors.
*
* Returns: the value of the dot product
*
* Since: 1.0
*/
float
graphene_vec3_dot (const graphene_vec3_t *a,
const graphene_vec3_t *b)
{
return graphene_simd4f_get_x (graphene_simd4f_dot3 (a->value, b->value));
}
