/**
* We attempt to have the player pick up a gun by raycasting to whatever the player is
* looking at, and then if we hit something in the raycast, we check the distance,
* and then we have to determine whether or not it's a gun.
*/
void attempt_to_pick_up_weapon()
{
if (player_held_item != nullptr)
return;
GLfloat yaw = camera._yaw;
GLfloat pitch = camera._pitch;
glm::vec3 pos = camera._position;
btScalar xz_len = cos(glm::radians(pitch));
btVector3 bt_to(xz_len * cos(glm::radians(yaw)),
sin(glm::radians(pitch)),
xz_len * sin(glm::radians(yaw)));
btVector3 bt_from(pos.x, pos.y, pos.z);
bt_from += bt_to;
bt_to *= 20;
btCollisionWorld::ClosestRayResultCallback result(bt_from, bt_to);
world->get_dynamics_world()->rayTest(bt_from, bt_to, result);
if (result.hasHit() && (bt_from - result.m_hitPointWorld).length() < 0.7)
{
btRigidBody* collided = const_cast<btRigidBody*>(static_cast<const btRigidBody*>(result.m_collisionObject));
Larp::Node* user_pointer = static_cast<Larp::Node*>(collided->getUserPointer());
Weapon* weaponptr = nullptr;
if(user_pointer != nullptr)
{
for (auto& it:pickupable_items) {
if(it->_node == user_pointer)
{
weaponptr = it;
}
}
}
if (weaponptr != nullptr)
{
world->get_dynamics_world()->removeRigidBody(const_cast<btRigidBody*>(collided));
user_pointer->detach_this_from_parent();
Larp::Node* gun_parent = camera_node->create_child();
gun_parent->attach_child(user_pointer);
user_pointer->set_position(0.0, 0.0, 0.0);
gun_parent->set_position(-0.2, -0.25, weaponptr->_offset_z);
glm::vec3 player_scale = static_cast<Larp::Node*>(player->get_user_pointer())->get_scale();
glm::vec3 user_pointer_scale = user_pointer->get_scale();
user_pointer->set_scale(user_pointer_scale.x / player_scale.x,
user_pointer_scale.y / player_scale.y,
user_pointer_scale.z / player_scale.z);
user_pointer->set_orientation(glm::quat(1, 0, 0, 0));
user_pointer->pitch(weaponptr->_offset_pitch);
user_pointer->yaw(weaponptr->_offset_yaw);
// Finally, update our player_held_item to denote that we are actually holding something
player_held_item = weaponptr;
}
}
}
float du_check_ray_hit(du_body_id du_body_a, float *from, float *to, bool local,
du_body_id du_body_b_arr[], int du_body_b_num, du_body_id *du_body_b_hit_ptr)
{
duWorld *world = get_active_world();
btCollisionObject *bt_body_a = reinterpret_cast <btCollisionObject*>(du_body_a);
btCollisionObject **bt_body_b_arr = reinterpret_cast <btCollisionObject**>(du_body_b_arr);
btVector3 bt_from(from[0], from[1], from[2]);
btVector3 bt_to(to[0], to[1], to[2]);
btVector3 bt_from_w, bt_to_w;
if (local) {
// offsets in local space of A
bt_from_w = bt_body_a->getWorldTransform() * bt_from;
bt_to_w = bt_body_a->getWorldTransform() * bt_to;
} else {
// offsets in world space
btTransform transform = bt_body_a->getWorldTransform();
btVector3 origin = transform.getOrigin();
bt_from_w = origin + bt_from;
bt_to_w = origin + bt_to;
}
ClosestArrayRayResultCallback ray_cb(bt_body_b_arr, du_body_b_num);
world->rayTest(bt_from_w, bt_to_w, ray_cb);
if (ray_cb.hasHit()) {
*du_body_b_hit_ptr = (du_body_id)ray_cb.m_collisionObject;
return ray_cb.m_closestHitFraction;
} else {
*du_body_b_hit_ptr = NULL;
return 1.0;
}
}
