Initializes a #graphene_vec4_t using the components of a #graphene_vec2_t and the values of z and w.
a #graphene_vec2_t
the value for the third component of v
the value for the fourth component of v
the initialized vector
Initializes a #graphene_vec4_t using the components of a #graphene_vec2_t and the values of z and w.