pub unsafe extern "C" fn graphene_quaternion_multiply(
a: *const graphene_quaternion_t,
b: *const graphene_quaternion_t,
res: *mut graphene_quaternion_t,
)
pub unsafe extern "C" fn graphene_quaternion_multiply(
a: *const graphene_quaternion_t,
b: *const graphene_quaternion_t,
res: *mut graphene_quaternion_t,
)