Add /emergeblocks command and core.emerge_area() Lua API

builtin/common/misc_helpers.lua

@@ -554,6 +554,36 @@ assert(core.string_to_pos("10.0, 5, -2").x == 10)
 assert(core.string_to_pos("( 10.0, 5, -2)").z == -2)
 assert(core.string_to_pos("asd, 5, -2)") == nil)
 
+--------------------------------------------------------------------------------
+function core.string_to_area(value)
+	local p1, p2 = unpack(value:split(") ("))
+	if p1 == nil or p2 == nil then
+		return nil
+	end
+
+	p1 = core.string_to_pos(p1 .. ")")
+	p2 = core.string_to_pos("(" .. p2)
+	if p1 == nil or p2 == nil then
+		return nil
+	end
+
+	return p1, p2
+end
+
+local function test_string_to_area()
+	local p1, p2 = core.string_to_area("(10.0, 5, -2) (  30.2,   4, -12.53)")
+	assert(p1.x == 10.0 and p1.y == 5 and p1.z == -2)
+	assert(p2.x == 30.2 and p2.y == 4 and p2.z == -12.53)
+
+	p1, p2 = core.string_to_area("(10.0, 5, -2  30.2,   4, -12.53")
+	assert(p1 == nil and p2 == nil)
+
+	p1, p2 = core.string_to_area("(10.0, 5,) -2  fgdf2,   4, -12.53")
+	assert(p1 == nil and p2 == nil)
+end
+
+test_string_to_area()
+
 --------------------------------------------------------------------------------
 function table.copy(t, seen)
 	local n = {}

builtin/game/chatcommands.lua

@@ -51,6 +51,27 @@ core.register_on_chat_message(function(name, message)
 	return true  -- Handled chat message
 end)
 
+-- Parses a "range" string in the format of "here (number)" or
+-- "(x1, y1, z1) (x2, y2, z2)", returning two position vectors
+local function parse_range_str(player_name, str)
+	local p1, p2
+	local args = str:split(" ")
+
+	if args[1] == "here" then
+		p1, p2 = core.get_player_radius_area(player_name, tonumber(args[2]))
+		if p1 == nil then
+			return false, "Unable to get player " .. player_name .. " position"
+		end
+	else
+		p1, p2 = core.string_to_area(str)
+		if p1 == nil then
+			return false, "Incorrect area format. Expected: (x1,y1,z1) (x2,y2,z2)"
+		end
+	end
+
+	return p1, p2
+end
+
 --
 -- Chat commands
 --
@@ -415,40 +436,31 @@ core.register_chatcommand("set", {
 	end,
 })
 
+core.register_chatcommand("emergeblocks", {
+	params = "(here [radius]) | (<pos1> <pos2>)",
+	description = "starts loading (or generating, if inexistent) map blocks "
+		.. "contained in area pos1 to pos2",
+	privs = {server=true},
+	func = function(name, param)
+		local p1, p2 = parse_range_str(name, param)
+		if p1 == false then
+			return false, p2
+		end
+
+		core.emerge_area(p1, p2)
+		return true, "Started emerge of area ranging from " ..
+			core.pos_to_string(p1, 1) .. " to " .. core.pos_to_string(p2, 1)
+	end,
+})
+
 core.register_chatcommand("deleteblocks", {
 	params = "(here [radius]) | (<pos1> <pos2>)",
 	description = "delete map blocks contained in area pos1 to pos2",
 	privs = {server=true},
 	func = function(name, param)
-		local p1 = {}
-		local p2 = {}
-		local args = param:split(" ")
-		if args[1] == "here" then
-			local player = core.get_player_by_name(name)
-			if player == nil then
-				core.log("error", "player is nil")
-				return false, "Unable to get current position; player is nil"
-			end
-			p1 = player:getpos()
-			p2 = p1
-
-			if #args >= 2 then
-				local radius = tonumber(args[2]) or 0
-				p1 = vector.add(p1, radius)
-				p2 = vector.subtract(p2, radius)
-			end
-		else
-			local pos1, pos2 = unpack(param:split(") ("))
-			if pos1 == nil or pos2 == nil then
-				return false, "Incorrect area format. Expected: (x1,y1,z1) (x2,y2,z2)"
-			end
-
-			p1 = core.string_to_pos(pos1 .. ")")
-			p2 = core.string_to_pos("(" .. pos2)
-
-			if p1 == nil or p2 == nil then
-				return false, "Incorrect area format. Expected: (x1,y1,z1) (x2,y2,z2)"
-			end
+		local p1, p2 = parse_range_str(name, param)
+		if p1 == false then
+			return false, p2
 		end
 
 		if core.delete_area(p1, p2) then

builtin/game/misc.lua

@@ -109,6 +109,25 @@ function core.get_connected_players()
 	return temp_table
 end
 
+-- Returns two position vectors representing a box of `radius` in each
+-- direction centered around the player corresponding to `player_name`
+function core.get_player_radius_area(player_name, radius)
+	local player = core.get_player_by_name(player_name)
+	if player == nil then
+		return nil
+	end
+
+	local p1 = player:getpos()
+	local p2 = p1
+
+	if radius then
+		p1 = vector.subtract(p1, radius)
+		p2 = vector.add(p2, radius)
+	end
+
+	return p1, p2
+end
+
 function core.hash_node_position(pos)
 	return (pos.z+32768)*65536*65536 + (pos.y+32768)*65536 + pos.x+32768
 end

doc/lua_api.txt

@@ -1708,6 +1708,8 @@ Helper functions
     * Convert position to a printable string
 * `minetest.string_to_pos(string)`: returns a position
     * Same but in reverse. Returns `nil` if the string can't be parsed to a position.
+* `minetest.string_to_area("(X1, Y1, Z1) (X2, Y2, Z2)")`: returns two positions
+    * Converts a string representing an area box into two positions
 * `minetest.formspec_escape(string)`: returns a string
     * escapes the characters "[", "]", "\", "," and ";", which can not be used in formspecs
 * `minetest.is_yes(arg)`
@@ -2020,6 +2022,9 @@ and `minetest.auth_reload` call the authetification handler.
     * `pos1` and `pos2` are optional and default to mapchunk minp and maxp.
 * `minetest.clear_objects()`
     * clear all objects in the environments
+* `minetest.emerge_area(pos1, pos2)`
+    * queues all mapblocks in the area from pos1 to pos2, inclusive, for emerge
+    * i.e. asynchronously loads blocks from disk, or if inexistent, generates them
 * `minetest.delete_area(pos1, pos2)`
     * delete all mapblocks in the area from pos1 to pos2, inclusive
 * `minetest.line_of_sight(pos1, pos2, stepsize)`: returns `boolean, pos`

src/emerge.cpp

@@ -235,11 +235,13 @@ void EmergeManager::stopThreads()
 }
 
 
-bool EmergeManager::enqueueBlockEmerge(u16 peer_id, v3s16 p, bool allow_generate)
+bool EmergeManager::enqueueBlockEmerge(u16 peer_id, v3s16 p,
+	bool allow_generate, bool force_queue_block)
 {
 	std::map<v3s16, BlockEmergeData *>::const_iterator iter;
 	BlockEmergeData *bedata;
-	u16 count;
+	u16 count_global = 0;
+	u16 count_peer = 0;
 	u8 flags = 0;
 	int idx = 0;
 
@@ -249,14 +251,17 @@ bool EmergeManager::enqueueBlockEmerge(u16 peer_id, v3s16 p, bool allow_generate
 	{
 		MutexAutoLock queuelock(queuemutex);
 
-		count = blocks_enqueued.size();
-		if (count >= qlimit_total)
+		count_global = blocks_enqueued.size();
+		count_peer   = peer_queue_count[peer_id];
+
+		if (!force_queue_block) {
+			if (count_global >= qlimit_total)
 				return false;
 
-		count = peer_queue_count[peer_id];
 			u16 qlimit_peer = allow_generate ? qlimit_generate : qlimit_diskonly;
-		if (count >= qlimit_peer)
+			if (count_peer >= qlimit_peer)
 				return false;
+		}
 
 		iter = blocks_enqueued.find(p);
 		if (iter != blocks_enqueued.end()) {
@@ -270,7 +275,7 @@ bool EmergeManager::enqueueBlockEmerge(u16 peer_id, v3s16 p, bool allow_generate
 		bedata->peer_requested = peer_id;
 		blocks_enqueued.insert(std::make_pair(p, bedata));
 
-		peer_queue_count[peer_id] = count + 1;
+		peer_queue_count[peer_id] = count_peer + 1;
 
 		// insert into the EmergeThread queue with the least items
 		int lowestitems = emergethread[0]->blockqueue.size();
@@ -289,6 +294,21 @@ bool EmergeManager::enqueueBlockEmerge(u16 peer_id, v3s16 p, bool allow_generate
 	return true;
 }
 
+v3s16 EmergeManager::getContainingChunk(v3s16 blockpos)
+{
+	return getContainingChunk(blockpos, params.chunksize);
+}
+
+
+v3s16 EmergeManager::getContainingChunk(v3s16 blockpos, s16 chunksize)
+{
+	s16 coff = -chunksize / 2;
+	v3s16 chunk_offset(coff, coff, coff);
+
+	return getContainerPos(blockpos - chunk_offset, chunksize)
+		* chunksize + chunk_offset;
+}
+
 
 int EmergeManager::getGroundLevelAtPoint(v2s16 p)
 {

src/emerge.h

@@ -109,7 +109,11 @@ public:
 	static void getMapgenNames(std::list<const char *> &mgnames);
 	void startThreads();
 	void stopThreads();
-	bool enqueueBlockEmerge(u16 peer_id, v3s16 p, bool allow_generate);
+	bool enqueueBlockEmerge(u16 peer_id, v3s16 p, bool allow_generate,
+		bool force_queue_block=false);
+
+	v3s16 getContainingChunk(v3s16 blockpos);
+	static v3s16 getContainingChunk(v3s16 blockpos, s16 chunksize);
 
 	// mapgen helper methods
 	Biome *getBiomeAtPoint(v3s16 p);

src/map.cpp

@@ -2259,14 +2259,9 @@ bool ServerMap::initBlockMake(BlockMakeData *data, v3s16 blockpos)
 	bool enable_mapgen_debug_info = m_emerge->mapgen_debug_info;
 	EMERGE_DBG_OUT("initBlockMake(): " PP(blockpos) " - " PP(blockpos));
 
-	s16 chunksize = m_emerge->params.chunksize;
-	s16 coffset = -chunksize / 2;
-	v3s16 chunk_offset(coffset, coffset, coffset);
-	v3s16 blockpos_div = getContainerPos(blockpos - chunk_offset, chunksize);
-	v3s16 blockpos_min = blockpos_div * chunksize;
-	v3s16 blockpos_max = blockpos_div * chunksize + v3s16(1,1,1)*(chunksize-1);
-	blockpos_min += chunk_offset;
-	blockpos_max += chunk_offset;
+	s16 csize = m_emerge->params.chunksize;
+	v3s16 blockpos_min = EmergeManager::getContainingChunk(blockpos, csize);
+	v3s16 blockpos_max = blockpos_min + v3s16(1, 1, 1) * (csize - 1);
 
 	v3s16 extra_borders(1,1,1);
 

src/script/lua_api/l_env.cpp

@@ -33,6 +33,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/pointedthing.h"
 #include "content_sao.h"
 #include "treegen.h"
+#include "emerge.h"
 #include "pathfinder.h"
 
 #define GET_ENV_PTR ServerEnvironment* env =                                   \
@@ -751,6 +752,29 @@ int ModApiEnvMod::l_line_of_sight(lua_State *L)
 	return 1;
 }
 
+
+// emerge_area(p1, p2)
+// emerge mapblocks in area p1..p2
+int ModApiEnvMod::l_emerge_area(lua_State *L)
+{
+	GET_ENV_PTR;
+
+	EmergeManager *emerge = getServer(L)->getEmergeManager();
+
+	v3s16 bpmin = getNodeBlockPos(read_v3s16(L, 1));
+	v3s16 bpmax = getNodeBlockPos(read_v3s16(L, 2));
+	sortBoxVerticies(bpmin, bpmax);
+
+	for (s16 z = bpmin.Z; z <= bpmax.Z; z++)
+	for (s16 y = bpmin.Y; y <= bpmax.Y; y++)
+	for (s16 x = bpmin.X; x <= bpmax.X; x++) {
+		v3s16 chunkpos(x, y, z);
+		emerge->enqueueBlockEmerge(PEER_ID_INEXISTENT, chunkpos, false, true);
+	}
+
+	return 0;
+}
+
 // delete_area(p1, p2)
 // delete mapblocks in area p1..p2
 int ModApiEnvMod::l_delete_area(lua_State *L)
@@ -954,6 +978,7 @@ void ModApiEnvMod::Initialize(lua_State *L, int top)
 	API_FCT(find_node_near);
 	API_FCT(find_nodes_in_area);
 	API_FCT(find_nodes_in_area_under_air);
+	API_FCT(emerge_area);
 	API_FCT(delete_area);
 	API_FCT(get_perlin);
 	API_FCT(get_perlin_map);

src/script/lua_api/l_env.h

@@ -125,6 +125,9 @@ private:
 	// nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
 	static int l_find_nodes_in_area_under_air(lua_State *L);
 
+	// emerge_area(p1, p2)
+	static int l_emerge_area(lua_State *L);
+
 	// delete_area(p1, p2) -> true/false
 	static int l_delete_area(lua_State *L);