Add minetest.get_mapgen_edges (#12999)

This commit is contained in:
Jude Melton-Houghton 2022-12-03 10:40:46 -05:00 committed by GitHub
parent e84d259ec7
commit b3ffc4b327
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6 changed files with 103 additions and 17 deletions

@ -5628,6 +5628,13 @@ Environment access
prefix `"no"` is attached, clears instead.
* `flags` is in the same format and has the same options as `mg_flags` in
`minetest.conf`.
* `minetest.get_mapgen_edges([mapgen_limit[, chunksize]])`
* Returns the minimum and maximum possible generated node positions
in that order.
* `mapgen_limit` is an optional number. If it is absent, its value is that
of the *active* mapgen setting `"mapgen_limit"`.
* `chunksize` is an optional number. If it is absent, its value is that
of the *active* mapgen setting `"chunksize"`.
* `minetest.get_mapgen_setting(name)`
* Gets the *active* mapgen setting (or nil if none exists) in string
format with the following order of precedence:

@ -110,3 +110,40 @@ local function test_game_info()
assert(info.title == game_conf:get("title"))
end
unittests.register("test_game_info", test_game_info)
local function test_mapgen_edges(cb)
-- Test that the map can extend to the expected edges and no further.
local min_edge, max_edge = minetest.get_mapgen_edges()
local min_finished = {}
local max_finished = {}
local function finish()
if #min_finished ~= 1 then
return cb("Expected 1 block to emerge around mapgen minimum edge")
end
if min_finished[1] ~= (min_edge / minetest.MAP_BLOCKSIZE):floor() then
return cb("Expected block within minimum edge to emerge")
end
if #max_finished ~= 1 then
return cb("Expected 1 block to emerge around mapgen maximum edge")
end
if max_finished[1] ~= (max_edge / minetest.MAP_BLOCKSIZE):floor() then
return cb("Expected block within maximum edge to emerge")
end
return cb()
end
local emerges_left = 2
local function emerge_block(blockpos, action, blocks_left, finished)
if action ~= minetest.EMERGE_CANCELLED then
table.insert(finished, blockpos)
end
if blocks_left == 0 then
emerges_left = emerges_left - 1
if emerges_left == 0 then
return finish()
end
end
end
minetest.emerge_area(min_edge:subtract(1), min_edge, emerge_block, min_finished)
minetest.emerge_area(max_edge, max_edge:add(1), emerge_block, max_finished)
end
unittests.register("test_mapgen_edges", test_mapgen_edges, {map=true, async=true})

@ -1063,9 +1063,20 @@ void MapgenParams::writeParams(Settings *settings) const
}
// Calculate exact edges of the outermost mapchunks that are within the
// set 'mapgen_limit'.
void MapgenParams::calcMapgenEdges()
s32 MapgenParams::getSpawnRangeMax()
{
if (!m_mapgen_edges_calculated) {
std::pair<s16, s16> edges = get_mapgen_edges(mapgen_limit, chunksize);
mapgen_edge_min = edges.first;
mapgen_edge_max = edges.second;
m_mapgen_edges_calculated = true;
}
return MYMIN(-mapgen_edge_min, mapgen_edge_max);
}
std::pair<s16, s16> get_mapgen_edges(s16 mapgen_limit, s16 chunksize)
{
// Central chunk offset, in blocks
s16 ccoff_b = -chunksize / 2;
@ -1089,17 +1100,5 @@ void MapgenParams::calcMapgenEdges()
s16 numcmin = MYMAX((ccfmin - mapgen_limit_min) / csize_n, 0);
s16 numcmax = MYMAX((mapgen_limit_max - ccfmax) / csize_n, 0);
// Mapgen edges, in nodes
mapgen_edge_min = ccmin - numcmin * csize_n;
mapgen_edge_max = ccmax + numcmax * csize_n;
m_mapgen_edges_calculated = true;
}
s32 MapgenParams::getSpawnRangeMax()
{
if (!m_mapgen_edges_calculated)
calcMapgenEdges();
return MYMIN(-mapgen_edge_min, mapgen_edge_max);
return std::pair<s16, s16>(ccmin - numcmin * csize_n, ccmax + numcmax * csize_n);
}

@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "nodedef.h"
#include "util/string.h"
#include "util/container.h"
#include <utility>
#define MAPGEN_DEFAULT MAPGEN_V7
#define MAPGEN_DEFAULT_NAME "v7"
@ -139,7 +140,6 @@ struct MapgenParams {
s32 getSpawnRangeMax();
private:
void calcMapgenEdges();
bool m_mapgen_edges_calculated = false;
};
@ -329,3 +329,7 @@ protected:
s16 dungeon_ymin;
s16 dungeon_ymax;
};
// Calculate exact edges of the outermost mapchunks that are within the set
// mapgen_limit. Returns the minimum and maximum edges in nodes in that order.
std::pair<s16, s16> get_mapgen_edges(s16 mapgen_limit, s16 chunksize);

@ -810,6 +810,41 @@ int ModApiMapgen::l_set_mapgen_params(lua_State *L)
return 0;
}
// get_mapgen_edges([mapgen_limit[, chunksize]])
int ModApiMapgen::l_get_mapgen_edges(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
MapSettingsManager *settingsmgr = getServer(L)->getEmergeManager()->map_settings_mgr;
// MapSettingsManager::makeMapgenParams cannot be used here because it would
// make mapgen settings immutable from then on. Mapgen settings should stay
// mutable until after mod loading ends.
s16 mapgen_limit;
if (lua_isnumber(L, 1)) {
mapgen_limit = lua_tointeger(L, 1);
} else {
std::string mapgen_limit_str;
settingsmgr->getMapSetting("mapgen_limit", &mapgen_limit_str);
mapgen_limit = stoi(mapgen_limit_str, 0, MAX_MAP_GENERATION_LIMIT);
}
s16 chunksize;
if (lua_isnumber(L, 2)) {
chunksize = lua_tointeger(L, 2);
} else {
std::string chunksize_str;
settingsmgr->getMapSetting("chunksize", &chunksize_str);
chunksize = stoi(chunksize_str, -32768, 32767);
}
std::pair<s16, s16> edges = get_mapgen_edges(mapgen_limit, chunksize);
push_v3s16(L, v3s16(1, 1, 1) * edges.first);
push_v3s16(L, v3s16(1, 1, 1) * edges.second);
return 2;
}
// get_mapgen_setting(name)
int ModApiMapgen::l_get_mapgen_setting(lua_State *L)
{
@ -1782,6 +1817,7 @@ void ModApiMapgen::Initialize(lua_State *L, int top)
API_FCT(get_mapgen_params);
API_FCT(set_mapgen_params);
API_FCT(get_mapgen_edges);
API_FCT(get_mapgen_setting);
API_FCT(set_mapgen_setting);
API_FCT(get_mapgen_setting_noiseparams);

@ -61,6 +61,9 @@ private:
// set mapgen parameters
static int l_set_mapgen_params(lua_State *L);
// get_mapgen_edges([mapgen_limit[, chunksize]])
static int l_get_mapgen_edges(lua_State *L);
// get_mapgen_setting(name)
static int l_get_mapgen_setting(lua_State *L);