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Add function `minetest.read_schematic`

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paly2 authored and sfan5 committed Apr 18, 2018
1 parent bf22184 commit b2065756cf9c90d493846a559587e4acec4a7851
Showing with 93 additions and 0 deletions.
  1. +12 −0 doc/lua_api.txt
  2. +78 −0 src/script/lua_api/l_mapgen.cpp
  3. +3 −0 src/script/lua_api/l_mapgen.h
@@ -4844,6 +4844,18 @@ Schematics
the Lua code generated will use that number of spaces as indentation
instead of a tab character.

* `minetest.read_schematic(schematic, options)`
* Returns a Lua table representing the schematic (see: [Schematic specifier])
* `schematic` is the schematic to read (see: [Schematic specifier])
* `options` is a table containing the following optional parameters:
* `write_yslice_prob`: string value:
* `none`: no `write_yslice_prob` table is inserted,
* `low`: only probabilities that are not 254 or 255 are written in
the `write_ylisce_prob` table,
* `all`: write all probabilities to the `write_yslice_prob` table.
* The default for this option is `all`.
* Any invalid value will be interpreted as `all`.

HTTP Requests
-------------

@@ -1754,6 +1754,83 @@ int ModApiMapgen::l_serialize_schematic(lua_State *L)
return 1;
}

// read_schematic(schematic, options={...})
int ModApiMapgen::l_read_schematic(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;

SchematicManager *schemmgr = getServer(L)->getEmergeManager()->schemmgr;

//// Read options
std::string write_yslice = getstringfield_default(L, 2, "write_yslice_prob", "all");

//// Get schematic
bool was_loaded = false;
Schematic *schem = (Schematic *)get_objdef(L, 1, schemmgr);
if (!schem) {
schem = load_schematic(L, 1, NULL, NULL);
was_loaded = true;
}
if (!schem) {
errorstream << "read_schematic: failed to get schematic" << std::endl;
return 0;
}
lua_pop(L, 2);

//// Create the Lua table
u32 numnodes = schem->size.X * schem->size.Y * schem->size.Z;
const std::vector<std::string> &names = schem->m_nodenames;

lua_createtable(L, 0, (write_yslice == "none") ? 2 : 3);

// Create the size field
push_v3s16(L, schem->size);
lua_setfield(L, 1, "size");

// Create the yslice_prob field
if (write_yslice != "none") {
lua_createtable(L, schem->size.Y, 0);
for (u16 y = 0; y != schem->size.Y; ++y) {
u8 probability = schem->slice_probs[y] & MTSCHEM_PROB_MASK;
if (probability < MTSCHEM_PROB_ALWAYS || write_yslice != "low") {
lua_createtable(L, 0, 2);
lua_pushinteger(L, y);
lua_setfield(L, 3, "ypos");
lua_pushinteger(L, probability * 2);
lua_setfield(L, 3, "prob");
lua_rawseti(L, 2, y + 1);
}
}
lua_setfield(L, 1, "yslice_prob");
}

// Create the data field
lua_createtable(L, numnodes, 0); // data table
for (u32 i = 0; i < numnodes; ++i) {
MapNode node = schem->schemdata[i];
u8 probability = node.param1 & MTSCHEM_PROB_MASK;
bool force_place = node.param1 & MTSCHEM_FORCE_PLACE;
lua_createtable(L, 0, force_place ? 4 : 3);
lua_pushstring(L, names[schem->schemdata[i].getContent()].c_str());
lua_setfield(L, 3, "name");
lua_pushinteger(L, probability * 2);
lua_setfield(L, 3, "prob");
lua_pushinteger(L, node.param2);
lua_setfield(L, 3, "param2");
if (force_place) {
lua_pushboolean(L, 1);
lua_setfield(L, 3, "force_place");
}
lua_rawseti(L, 2, i + 1);
}
lua_setfield(L, 1, "data");

if (was_loaded)
delete schem;

return 1;
}


void ModApiMapgen::Initialize(lua_State *L, int top)
{
@@ -1793,4 +1870,5 @@ void ModApiMapgen::Initialize(lua_State *L, int top)
API_FCT(place_schematic);
API_FCT(place_schematic_on_vmanip);
API_FCT(serialize_schematic);
API_FCT(read_schematic);
}
@@ -131,6 +131,9 @@ class ModApiMapgen : public ModApiBase
// serialize_schematic(schematic, format, options={...})
static int l_serialize_schematic(lua_State *L);

// read_schematic(schematic, options={...})
static int l_read_schematic(lua_State *L);

public:
static void Initialize(lua_State *L, int top);

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