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Add minetest.get_mapgen_edges
(#12999)
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@ -5628,6 +5628,13 @@ Environment access
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prefix `"no"` is attached, clears instead.
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* `flags` is in the same format and has the same options as `mg_flags` in
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`minetest.conf`.
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* `minetest.get_mapgen_edges([mapgen_limit[, chunksize]])`
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* Returns the minimum and maximum possible generated node positions
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in that order.
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* `mapgen_limit` is an optional number. If it is absent, its value is that
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of the *active* mapgen setting `"mapgen_limit"`.
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* `chunksize` is an optional number. If it is absent, its value is that
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of the *active* mapgen setting `"chunksize"`.
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* `minetest.get_mapgen_setting(name)`
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* Gets the *active* mapgen setting (or nil if none exists) in string
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format with the following order of precedence:
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@ -110,3 +110,40 @@ local function test_game_info()
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assert(info.title == game_conf:get("title"))
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end
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unittests.register("test_game_info", test_game_info)
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local function test_mapgen_edges(cb)
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-- Test that the map can extend to the expected edges and no further.
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local min_edge, max_edge = minetest.get_mapgen_edges()
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local min_finished = {}
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local max_finished = {}
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local function finish()
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if #min_finished ~= 1 then
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return cb("Expected 1 block to emerge around mapgen minimum edge")
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end
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if min_finished[1] ~= (min_edge / minetest.MAP_BLOCKSIZE):floor() then
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return cb("Expected block within minimum edge to emerge")
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end
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if #max_finished ~= 1 then
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return cb("Expected 1 block to emerge around mapgen maximum edge")
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end
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if max_finished[1] ~= (max_edge / minetest.MAP_BLOCKSIZE):floor() then
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return cb("Expected block within maximum edge to emerge")
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end
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return cb()
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end
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local emerges_left = 2
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local function emerge_block(blockpos, action, blocks_left, finished)
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if action ~= minetest.EMERGE_CANCELLED then
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table.insert(finished, blockpos)
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end
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if blocks_left == 0 then
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emerges_left = emerges_left - 1
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if emerges_left == 0 then
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return finish()
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end
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end
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end
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minetest.emerge_area(min_edge:subtract(1), min_edge, emerge_block, min_finished)
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minetest.emerge_area(max_edge, max_edge:add(1), emerge_block, max_finished)
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end
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unittests.register("test_mapgen_edges", test_mapgen_edges, {map=true, async=true})
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@ -1063,9 +1063,20 @@ void MapgenParams::writeParams(Settings *settings) const
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}
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// Calculate exact edges of the outermost mapchunks that are within the
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// set 'mapgen_limit'.
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void MapgenParams::calcMapgenEdges()
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s32 MapgenParams::getSpawnRangeMax()
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{
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if (!m_mapgen_edges_calculated) {
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std::pair<s16, s16> edges = get_mapgen_edges(mapgen_limit, chunksize);
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mapgen_edge_min = edges.first;
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mapgen_edge_max = edges.second;
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m_mapgen_edges_calculated = true;
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}
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return MYMIN(-mapgen_edge_min, mapgen_edge_max);
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}
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std::pair<s16, s16> get_mapgen_edges(s16 mapgen_limit, s16 chunksize)
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{
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// Central chunk offset, in blocks
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s16 ccoff_b = -chunksize / 2;
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@ -1089,17 +1100,5 @@ void MapgenParams::calcMapgenEdges()
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s16 numcmin = MYMAX((ccfmin - mapgen_limit_min) / csize_n, 0);
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s16 numcmax = MYMAX((mapgen_limit_max - ccfmax) / csize_n, 0);
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// Mapgen edges, in nodes
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mapgen_edge_min = ccmin - numcmin * csize_n;
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mapgen_edge_max = ccmax + numcmax * csize_n;
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m_mapgen_edges_calculated = true;
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}
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s32 MapgenParams::getSpawnRangeMax()
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{
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if (!m_mapgen_edges_calculated)
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calcMapgenEdges();
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return MYMIN(-mapgen_edge_min, mapgen_edge_max);
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return std::pair<s16, s16>(ccmin - numcmin * csize_n, ccmax + numcmax * csize_n);
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}
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@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
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#include "nodedef.h"
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#include "util/string.h"
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#include "util/container.h"
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#include <utility>
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#define MAPGEN_DEFAULT MAPGEN_V7
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#define MAPGEN_DEFAULT_NAME "v7"
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@ -139,7 +140,6 @@ struct MapgenParams {
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s32 getSpawnRangeMax();
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private:
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void calcMapgenEdges();
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bool m_mapgen_edges_calculated = false;
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};
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@ -329,3 +329,7 @@ protected:
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s16 dungeon_ymin;
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s16 dungeon_ymax;
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};
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// Calculate exact edges of the outermost mapchunks that are within the set
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// mapgen_limit. Returns the minimum and maximum edges in nodes in that order.
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std::pair<s16, s16> get_mapgen_edges(s16 mapgen_limit, s16 chunksize);
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@ -810,6 +810,41 @@ int ModApiMapgen::l_set_mapgen_params(lua_State *L)
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return 0;
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}
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// get_mapgen_edges([mapgen_limit[, chunksize]])
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int ModApiMapgen::l_get_mapgen_edges(lua_State *L)
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{
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NO_MAP_LOCK_REQUIRED;
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MapSettingsManager *settingsmgr = getServer(L)->getEmergeManager()->map_settings_mgr;
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// MapSettingsManager::makeMapgenParams cannot be used here because it would
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// make mapgen settings immutable from then on. Mapgen settings should stay
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// mutable until after mod loading ends.
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s16 mapgen_limit;
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if (lua_isnumber(L, 1)) {
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mapgen_limit = lua_tointeger(L, 1);
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} else {
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std::string mapgen_limit_str;
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settingsmgr->getMapSetting("mapgen_limit", &mapgen_limit_str);
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mapgen_limit = stoi(mapgen_limit_str, 0, MAX_MAP_GENERATION_LIMIT);
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}
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s16 chunksize;
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if (lua_isnumber(L, 2)) {
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chunksize = lua_tointeger(L, 2);
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} else {
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std::string chunksize_str;
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settingsmgr->getMapSetting("chunksize", &chunksize_str);
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chunksize = stoi(chunksize_str, -32768, 32767);
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}
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std::pair<s16, s16> edges = get_mapgen_edges(mapgen_limit, chunksize);
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push_v3s16(L, v3s16(1, 1, 1) * edges.first);
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push_v3s16(L, v3s16(1, 1, 1) * edges.second);
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return 2;
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}
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// get_mapgen_setting(name)
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int ModApiMapgen::l_get_mapgen_setting(lua_State *L)
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{
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@ -1782,6 +1817,7 @@ void ModApiMapgen::Initialize(lua_State *L, int top)
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API_FCT(get_mapgen_params);
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API_FCT(set_mapgen_params);
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API_FCT(get_mapgen_edges);
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API_FCT(get_mapgen_setting);
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API_FCT(set_mapgen_setting);
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API_FCT(get_mapgen_setting_noiseparams);
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@ -61,6 +61,9 @@ private:
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// set mapgen parameters
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static int l_set_mapgen_params(lua_State *L);
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// get_mapgen_edges([mapgen_limit[, chunksize]])
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static int l_get_mapgen_edges(lua_State *L);
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// get_mapgen_setting(name)
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static int l_get_mapgen_setting(lua_State *L);
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