Add map limit config option

minetest.conf.example

@@ -417,6 +417,13 @@
 #max_block_send_distance = 10
 #    From how far blocks are generated for clients, stated in mapblocks (16 nodes)
 #max_block_generate_distance = 6
+#    Where the map generator stops.
+#    Please note:
+#      * Limited to 31000 (setting above has no effect)
+#      * The map generator works in groups of 80x80x80 nodes (5x5x5 MapBlocks).
+#      * Those groups have an offset of -32, -32 nodes from the origin.
+#      * Only groups which are within the map_generation_limit are generated
+#map_generation_limit = 31000
 #    Number of extra blocks that can be loaded by /clearobjects at once.
 #    This is a trade-off between sqlite transaction overhead and
 #    memory consumption (4096=100MB, as a rule of thumb).
@@ -603,4 +610,3 @@
 #    Comma-separated list of trusted mods that are allowed to access insecure
 #    functions even when mod security is on (via request_insecure_environment()).
 #secure.trusted_mods =
-

src/clientiface.cpp

@@ -209,25 +209,19 @@ void RemoteClient::GetNextBlocks (
 				max_simul_dynamic = max_simul_sends_setting;
 
 			// Don't select too many blocks for sending
-			if(num_blocks_selected >= max_simul_dynamic)
+			if (num_blocks_selected >= max_simul_dynamic) {
-			{
 				//queue_is_full = true;
 				goto queue_full_break;
 			}
 
 			// Don't send blocks that are currently being transferred
-			if(m_blocks_sending.find(p) != m_blocks_sending.end())
+			if (m_blocks_sending.find(p) != m_blocks_sending.end())
 				continue;
 
 			/*
 				Do not go over-limit
 			*/
-			if(p.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+			if (blockpos_over_limit(p))
-			|| p.X > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
-			|| p.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
-			|| p.Y > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
-			|| p.Z < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
-			|| p.Z > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
 				continue;
 
 			// If this is true, inexistent block will be made from scratch
@@ -239,7 +233,7 @@ void RemoteClient::GetNextBlocks (
 					generate = false;*/
 
 				// Limit the send area vertically to 1/2
-				if(abs(p.Y - center.Y) > full_d_max / 2)
+				if (abs(p.Y - center.Y) > full_d_max / 2)
 					continue;
 			}
 

src/constants.h

@@ -64,7 +64,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 // The absolute working limit is (2^15 - viewing_range).
 // I really don't want to make every algorithm to check if it's going near
 // the limit or not, so this is lower.
-#define MAP_GENERATION_LIMIT (31000)
+// This is the maximum value the setting map_generation_limit can be
+#define MAX_MAP_GENERATION_LIMIT (31000)
 
 // Size of node in floating-point units
 // The original idea behind this is to disallow plain casts between
@@ -116,4 +117,3 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define DEFAULT_FONT_SIZE       (10)
 
 #endif
-

src/defaultsettings.cpp

@@ -94,6 +94,7 @@ void set_default_settings(Settings *settings)
 	// A bit more than the server will send around the player, to make fog blend well
 	settings->setDefault("viewing_range_nodes_max", "240");
 	settings->setDefault("viewing_range_nodes_min", "35");
+	settings->setDefault("map_generation_limit", "31000");
 	settings->setDefault("screenW", "800");
 	settings->setDefault("screenH", "600");
 	settings->setDefault("fullscreen", "false");

src/map.cpp

@@ -2502,10 +2502,12 @@ ServerMapSector * ServerMap::createSector(v2s16 p2d)
 	/*
 		Do not create over-limit
 	*/
-	if(p2d.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+	const static u16 map_gen_limit = MYMIN(MAX_MAP_GENERATION_LIMIT,
-	|| p2d.X > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+		g_settings->getU16("map_generation_limit"));
-	|| p2d.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+	if(p2d.X < -map_gen_limit / MAP_BLOCKSIZE
-	|| p2d.Y > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
+			|| p2d.X >  map_gen_limit / MAP_BLOCKSIZE
+			|| p2d.Y < -map_gen_limit / MAP_BLOCKSIZE
+			|| p2d.Y >  map_gen_limit / MAP_BLOCKSIZE)
 		throw InvalidPositionException("createSector(): pos. over limit");
 
 	/*
@@ -2649,12 +2651,7 @@ MapBlock * ServerMap::createBlock(v3s16 p)
 	/*
 		Do not create over-limit
 	*/
-	if(p.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+	if (blockpos_over_limit(p))
-	|| p.X > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
-	|| p.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
-	|| p.Y > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
-	|| p.Z < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
-	|| p.Z > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
 		throw InvalidPositionException("createBlock(): pos. over limit");
 
 	v2s16 p2d(p.X, p.Z);

src/mapblock.h

@@ -31,6 +31,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "nodetimer.h"
 #include "modifiedstate.h"
 #include "util/numeric.h" // getContainerPos
+#include "settings.h"
 
 class Map;
 class NodeMetadataList;
@@ -638,13 +639,14 @@ typedef std::vector<MapBlock*> MapBlockVect;
 
 inline bool blockpos_over_limit(v3s16 p)
 {
-	return
+	const static u16 map_gen_limit = MYMIN(MAX_MAP_GENERATION_LIMIT,
-	  (p.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+		g_settings->getU16("map_generation_limit"));
-	|| p.X >  MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+	return (p.X < -map_gen_limit / MAP_BLOCKSIZE
-	|| p.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+			|| p.X >  map_gen_limit / MAP_BLOCKSIZE
-	|| p.Y >  MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+			|| p.Y < -map_gen_limit / MAP_BLOCKSIZE
-	|| p.Z < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+			|| p.Y >  map_gen_limit / MAP_BLOCKSIZE
-	|| p.Z >  MAP_GENERATION_LIMIT / MAP_BLOCKSIZE);
+			|| p.Z < -map_gen_limit / MAP_BLOCKSIZE
+			|| p.Z >  map_gen_limit / MAP_BLOCKSIZE);
 }
 
 /*
@@ -681,4 +683,3 @@ inline void getNodeSectorPosWithOffset(const v2s16 &p, v2s16 &block, v2s16 &offs
 std::string analyze_block(MapBlock *block);
 
 #endif
-

src/mapgen.cpp

@@ -143,7 +143,7 @@ s16 Mapgen::findGroundLevelFull(v2s16 p2d)
 }
 
 
-// Returns -MAP_GENERATION_LIMIT if not found
+// Returns -MAX_MAP_GENERATION_LIMIT if not found
 s16 Mapgen::findGroundLevel(v2s16 p2d, s16 ymin, s16 ymax)
 {
 	v3s16 em = vm->m_area.getExtent();
@@ -157,7 +157,7 @@ s16 Mapgen::findGroundLevel(v2s16 p2d, s16 ymin, s16 ymax)
 
 		vm->m_area.add_y(em, i, -1);
 	}
-	return (y >= ymin) ? y : -MAP_GENERATION_LIMIT;
+	return (y >= ymin) ? y : -MAX_MAP_GENERATION_LIMIT;
 }
 
 
@@ -475,4 +475,3 @@ void MapgenParams::save(Settings &settings) const
 	if (sparams)
 		sparams->writeParams(&settings);
 }
-

src/mapgen_v5.cpp

@@ -370,7 +370,7 @@ int MapgenV5::generateBaseTerrain()
 {
 	u32 index = 0;
 	u32 index2d = 0;
-	int stone_surface_max_y = -MAP_GENERATION_LIMIT;
+	int stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 
 	for (s16 z=node_min.Z; z<=node_max.Z; z++) {
 		for (s16 y=node_min.Y - 1; y<=node_max.Y + 1; y++) {
@@ -585,4 +585,3 @@ void MapgenV5::dustTopNodes()
 		}
 	}
 }
-

src/mapgen_v6.cpp

@@ -626,7 +626,7 @@ int MapgenV6::generateGround()
 	MapNode n_air(CONTENT_AIR), n_water_source(c_water_source);
 	MapNode n_stone(c_stone), n_desert_stone(c_desert_stone);
 	MapNode n_ice(c_ice);
-	int stone_surface_max_y = -MAP_GENERATION_LIMIT;
+	int stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 
 	u32 index = 0;
 	for (s16 z = node_min.Z; z <= node_max.Z; z++)

src/mapgen_v7.cpp

@@ -505,8 +505,8 @@ void MapgenV7::generateBaseTerrain(s16 *stone_surface_min_y, s16 *stone_surface_
 	MapNode n_water(c_water_source);
 
 	v3s16 em = vm->m_area.getExtent();
-	s16 surface_min_y = MAP_GENERATION_LIMIT;
+	s16 surface_min_y = MAX_MAP_GENERATION_LIMIT;
-	s16 surface_max_y = -MAP_GENERATION_LIMIT;
+	s16 surface_max_y = -MAX_MAP_GENERATION_LIMIT;
 	u32 index = 0;
 
 	for (s16 z = node_min.Z; z <= node_max.Z; z++)
@@ -885,4 +885,3 @@ void MapgenV7::generateCaves(s16 max_stone_y)
 		cave.makeCave(node_min, node_max, max_stone_y);
 	}
 }
-

src/mg_biome.cpp

@@ -45,8 +45,8 @@ BiomeManager::BiomeManager(IGameDef *gamedef) :
 	b->depth_top       = 0;
 	b->depth_filler    = 0;
 	b->depth_water_top = 0;
-	b->y_min           = -MAP_GENERATION_LIMIT;
+	b->y_min           = -MAX_MAP_GENERATION_LIMIT;
-	b->y_max           = MAP_GENERATION_LIMIT;
+	b->y_max           = MAX_MAP_GENERATION_LIMIT;
 	b->heat_point      = 0.0;
 	b->humidity_point  = 0.0;
 
@@ -140,4 +140,3 @@ void Biome::resolveNodeNames()
 	getIdFromNrBacklog(&c_river_water, "mapgen_river_water_source", CONTENT_AIR);
 	getIdFromNrBacklog(&c_dust,        "air",                       CONTENT_IGNORE);
 }
-