remove_detached_inventory: Fix segfault during mod load
[oweals/minetest.git] / src / emerge.h
1 /*
2 Minetest
3 Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #pragma once
21
22 #include <map>
23 #include <mutex>
24 #include "network/networkprotocol.h"
25 #include "irr_v3d.h"
26 #include "util/container.h"
27 #include "mapgen/mapgen.h" // for MapgenParams
28 #include "map.h"
29
30 #define BLOCK_EMERGE_ALLOW_GEN   (1 << 0)
31 #define BLOCK_EMERGE_FORCE_QUEUE (1 << 1)
32
33 #define EMERGE_DBG_OUT(x) {                            \
34         if (enable_mapgen_debug_info)                      \
35                 infostream << "EmergeThread: " x << std::endl; \
36 }
37
38 class EmergeThread;
39 class NodeDefManager;
40 class Settings;
41
42 class BiomeManager;
43 class OreManager;
44 class DecorationManager;
45 class SchematicManager;
46 class Server;
47
48 // Structure containing inputs/outputs for chunk generation
49 struct BlockMakeData {
50         MMVManip *vmanip = nullptr;
51         u64 seed = 0;
52         v3s16 blockpos_min;
53         v3s16 blockpos_max;
54         v3s16 blockpos_requested;
55         UniqueQueue<v3s16> transforming_liquid;
56         const NodeDefManager *nodedef = nullptr;
57
58         BlockMakeData() = default;
59
60         ~BlockMakeData() { delete vmanip; }
61 };
62
63 // Result from processing an item on the emerge queue
64 enum EmergeAction {
65         EMERGE_CANCELLED,
66         EMERGE_ERRORED,
67         EMERGE_FROM_MEMORY,
68         EMERGE_FROM_DISK,
69         EMERGE_GENERATED,
70 };
71
72 // Callback
73 typedef void (*EmergeCompletionCallback)(
74         v3s16 blockpos, EmergeAction action, void *param);
75
76 typedef std::vector<
77         std::pair<
78                 EmergeCompletionCallback,
79                 void *
80         >
81 > EmergeCallbackList;
82
83 struct BlockEmergeData {
84         u16 peer_requested;
85         u16 flags;
86         EmergeCallbackList callbacks;
87 };
88
89 class EmergeManager {
90 public:
91         const NodeDefManager *ndef;
92         bool enable_mapgen_debug_info;
93
94         // Generation Notify
95         u32 gen_notify_on = 0;
96         std::set<u32> gen_notify_on_deco_ids;
97
98         // Parameters passed to mapgens owned by ServerMap
99         // TODO(hmmmm): Remove this after mapgen helper methods using them
100         // are moved to ServerMap
101         MapgenParams *mgparams;
102
103         // Hackish workaround:
104         // For now, EmergeManager must hold onto a ptr to the Map's setting manager
105         // since the Map can only be accessed through the Environment, and the
106         // Environment is not created until after script initialization.
107         MapSettingsManager *map_settings_mgr;
108
109         // Managers of various map generation-related components
110         BiomeManager *biomemgr;
111         OreManager *oremgr;
112         DecorationManager *decomgr;
113         SchematicManager *schemmgr;
114
115         // Methods
116         EmergeManager(Server *server);
117         ~EmergeManager();
118         DISABLE_CLASS_COPY(EmergeManager);
119
120         void initMapgens(MapgenParams *mgparams);
121
122         void startThreads();
123         void stopThreads();
124         bool isRunning();
125
126         bool enqueueBlockEmerge(
127                 session_t peer_id,
128                 v3s16 blockpos,
129                 bool allow_generate,
130                 bool ignore_queue_limits=false);
131
132         bool enqueueBlockEmergeEx(
133                 v3s16 blockpos,
134                 session_t peer_id,
135                 u16 flags,
136                 EmergeCompletionCallback callback,
137                 void *callback_param);
138
139         v3s16 getContainingChunk(v3s16 blockpos);
140
141         Mapgen *getCurrentMapgen();
142
143         // Mapgen helpers methods
144         int getSpawnLevelAtPoint(v2s16 p);
145         int getGroundLevelAtPoint(v2s16 p);
146         bool isBlockUnderground(v3s16 blockpos);
147
148         static v3s16 getContainingChunk(v3s16 blockpos, s16 chunksize);
149
150 private:
151         std::vector<Mapgen *> m_mapgens;
152         std::vector<EmergeThread *> m_threads;
153         bool m_threads_active = false;
154
155         std::mutex m_queue_mutex;
156         std::map<v3s16, BlockEmergeData> m_blocks_enqueued;
157         std::unordered_map<u16, u16> m_peer_queue_count;
158
159         u16 m_qlimit_total;
160         u16 m_qlimit_diskonly;
161         u16 m_qlimit_generate;
162
163         // Requires m_queue_mutex held
164         EmergeThread *getOptimalThread();
165
166         bool pushBlockEmergeData(
167                 v3s16 pos,
168                 u16 peer_requested,
169                 u16 flags,
170                 EmergeCompletionCallback callback,
171                 void *callback_param,
172                 bool *entry_already_exists);
173
174         bool popBlockEmergeData(v3s16 pos, BlockEmergeData *bedata);
175
176         friend class EmergeThread;
177 };