squared distance for vec3

include/cglm/call/vec3.h

@@ -148,6 +148,10 @@ CGLM_EXPORT
 void
 glmc_vec_center(vec3 v1, vec3 v2, vec3 dest);
 
+CGLM_EXPORT
+float
+glmc_vec_distance2(vec3 v1, vec3 v2);
+
 CGLM_EXPORT
 float
 glmc_vec_distance(vec3 v1, vec3 v2);

include/cglm/vec3.h

@@ -633,6 +633,21 @@ glm_vec_center(vec3 v1, vec3 v2, vec3 dest) {
   glm_vec_scale(dest, 0.5f, dest);
 }
 
+/**
+ * @brief squared distance between two vectors
+ *
+ * @param[in] v1 vector1
+ * @param[in] v2 vector2
+ * @return returns squared distance (distance * distance)
+ */
+CGLM_INLINE
+float
+glm_vec_distance2(vec3 v1, vec3 v2) {
+  return glm_pow2(v2[0] - v1[0])
+       + glm_pow2(v2[1] - v1[1])
+       + glm_pow2(v2[2] - v1[2]);
+}
+
 /**
  * @brief distance between two vectors
  *
@@ -643,9 +658,7 @@ glm_vec_center(vec3 v1, vec3 v2, vec3 dest) {
 CGLM_INLINE
 float
 glm_vec_distance(vec3 v1, vec3 v2) {
-  return sqrtf(glm_pow2(v2[0] - v1[0])
-             + glm_pow2(v2[1] - v1[1])
-             + glm_pow2(v2[2] - v1[2]));
+  return sqrtf(glm_vec_distance2(v1, v2));
 }
 
 /*!