src/serverobject.h

   1 /************************************************************************
   2 * Minetest-c55
   3 * Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4 *
   5 * serverobject.h
   6 * voxelands - 3d voxel world sandbox game
   7 * Copyright (C) Lisa 'darkrose' Milne 2013-2014 <lisa@ltmnet.com>
   8 *
   9 * This program is free software: you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation, either version 3 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful, but
  15 * WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  17 * See the GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program.  If not, see <http://www.gnu.org/licenses/>
  21 *
  22 * License updated from GPLv2 or later to GPLv3 or later by Lisa Milne
  23 * for Voxelands.
  24 ************************************************************************/
  25
  26 #ifndef SERVEROBJECT_HEADER
  27 #define SERVEROBJECT_HEADER
  28
  29 #include "common_irrlicht.h"
  30 #include "activeobject.h"
  31 #include "mapnode.h"
  32 #include "utility.h"
  33
  34 #define MOB_NONE 0
  35 #define MOB_PASSIVE 1
  36 #define MOB_AGGRESSIVE 2
  37 #define MOB_DESTRUCTIVE 3
  38
  39 /*
  40
  41 Some planning
  42 -------------
  43
  44 * Server environment adds an active object, which gets the id 1
  45 *
  46 * The active object list is scanned for each client once in a while,
  47 * and it finds out what objects have been added that are not known
  48 * by the client yet. This scan is initiated by the Server class and
  49 * the result ends up directly to the server.
  50 *
  51 * A network packet is created with the info and sent to the client.
  52 * Environment converts objects to static data and static data to
  53 * objects, based on how close players are to them.
  54 */
  55
  56 class ServerEnvironment;
  57 class InventoryItem;
  58 class Player;
  59
  60 class ServerActiveObject : public ActiveObject
  61 {
  62 public:
  63         /*
  64                 NOTE: m_env can be NULL, but step() isn't called if it is.
  65                 Prototypes are used that way.
  66         */
  67         ServerActiveObject(ServerEnvironment *env, u16 id, v3f pos);
  68         virtual ~ServerActiveObject();
  69
  70         // Create a certain type of ServerActiveObject
  71         static ServerActiveObject* create(u8 type,
  72                         ServerEnvironment *env, u16 id, v3f pos,
  73                         const std::string &data);
  74
  75         /*
  76                 Some simple getters/setters
  77         */
  78         v3f getBasePosition()
  79                 {return m_base_position;}
  80         void setBasePosition(v3f pos)
  81                 {m_base_position = pos;}
  82         ServerEnvironment* getEnv()
  83                 {return m_env;}
  84
  85         /*
  86                 Step object in time.
  87                 Messages added to messages are sent to client over network.
  88
  89                 send_recommended:
  90                         True at around 5-10 times a second, same for all objects.
  91                         This is used to let objects send most of the data at the
  92                         same time so that the data can be combined in a single
  93                         packet.
  94         */
  95         virtual void step(float dtime, bool send_recommended){}
  96
  97         /*
  98                 The return value of this is passed to the client-side object
  99                 when it is created
 100         */
 101         virtual std::string getClientInitializationData(){return "";}
 102
 103         /*
 104                 The return value of this is passed to the server-side object
 105                 when it is created (converted from static to active - actually
 106                 the data is the static form)
 107         */
 108         virtual std::string getStaticData(){return "";}
 109
 110         /*
 111                 Item that the player gets when this object is picked up.
 112                 If NULL, object cannot be picked up.
 113         */
 114         virtual InventoryItem* createPickedUpItem(content_t punch_item) {return NULL;}
 115
 116         /*
 117                 If the object doesn't return an item, this will be called.
 118                 Return value is tool wear.
 119         */
 120         virtual u16 punch(content_t punch_item, v3f dir, const std::string &playername) {return 0;}
 121
 122         /*
 123                 return true if inventory is modified
 124         */
 125         virtual bool rightClick(Player *player) {return false;}
 126
 127         virtual u8 level(){return MOB_PASSIVE;}
 128
 129         /*
 130                 Number of players which know about this object. Object won't be
 131                 deleted until this is 0 to keep the id preserved for the right
 132                 object.
 133         */
 134         u16 m_known_by_count;
 135
 136         /*
 137                 - Whether this object is to be removed when nobody knows about
 138                   it anymore.
 139                 - Removal is delayed to preserve the id for the time during which
 140                   it could be confused to some other object by some client.
 141                 - This is set to true by the step() method when the object wants
 142                   to be deleted.
 143                 - This can be set to true by anything else too.
 144         */
 145         bool m_removed;
 146
 147         /*
 148                 This is set to true when a block should be removed from the active
 149                 object list but couldn't be removed because the id has to be
 150                 reserved for some client.
 151
 152                 The environment checks this periodically. If this is true and also
 153                 m_known_by_count is true,
 154         */
 155         bool m_pending_deactivation;
 156
 157         /*
 158                 Whether the object's static data has been stored to a block
 159         */
 160         bool m_static_exists;
 161         /*
 162                 The block from which the object was loaded from, and in which
 163                 a copy of the static data resides.
 164         */
 165         v3s16 m_static_block;
 166
 167         /*
 168                 Queue of messages to be sent to the client
 169         */
 170         Queue<ActiveObjectMessage> m_messages_out;
 171
 172 protected:
 173         // Used for creating objects based on type
 174         typedef ServerActiveObject* (*Factory)
 175                         (ServerEnvironment *env, u16 id, v3f pos,
 176                         const std::string &data);
 177         static void registerType(u16 type, Factory f);
 178
 179         ServerEnvironment *m_env;
 180         v3f m_base_position;
 181
 182 private:
 183         // Used for creating objects based on type
 184         static core::map<u16, Factory> m_types;
 185 };
 186
 187 #endif
 188