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Add find_surface_nodes_in_area LUA call which permit to only get the …

…nodes which touch air. This permit to massively improve performance for mods like plantlife
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nerzhul authored and Zeno- committed Feb 27, 2015
1 parent 2b189d4 commit 0f556d0c7f8c98c7209416577aae4fcc0c1c2b32
Showing with 56 additions and 3 deletions.
  1. +3 −0 doc/lua_api.txt
  2. +49 −3 src/script/lua_api/l_env.cpp
  3. +4 −0 src/script/lua_api/l_env.h
@@ -1869,6 +1869,9 @@ and `minetest.auth_reload` call the authetification handler.
* `nodenames`: e.g. `{"ignore", "group:tree"}` or `"default:dirt"`
* `minetest.find_nodes_in_area(minp, maxp, nodenames)`: returns a list of positions
* `nodenames`: e.g. `{"ignore", "group:tree"}` or `"default:dirt"`
* `minetest.find_surface_nodes_in_area(minp, maxp, nodenames)`: returns a list of positions
* returned positions are nodes with a node air above
* `nodenames`: e.g. `{"ignore", "group:tree"}` or `"default:dirt"`
* `minetest.get_perlin(noiseparams)`
* `minetest.get_perlin(seeddiff, octaves, persistence, scale)`
* Return world-specific perlin noise (`int(worldseed)+seeddiff`)
@@ -541,17 +541,17 @@ int ModApiEnvMod::l_find_nodes_in_area(lua_State *L)
v3s16 minp = read_v3s16(L, 1);
v3s16 maxp = read_v3s16(L, 2);
std::set<content_t> filter;
if(lua_istable(L, 3)){
if(lua_istable(L, 3)) {
int table = 3;
lua_pushnil(L);
while(lua_next(L, table) != 0){
while(lua_next(L, table) != 0) {
// key at index -2 and value at index -1
luaL_checktype(L, -1, LUA_TSTRING);
ndef->getIds(lua_tostring(L, -1), filter);
// removes value, keeps key for next iteration
lua_pop(L, 1);
}
} else if(lua_isstring(L, 3)){
} else if(lua_isstring(L, 3)) {
ndef->getIds(lua_tostring(L, 3), filter);
}

@@ -570,6 +570,51 @@ int ModApiEnvMod::l_find_nodes_in_area(lua_State *L)
return 1;
}

// find_surface_nodes_in_area(minp, maxp, nodenames) -> list of positions
// nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
int ModApiEnvMod::l_find_surface_nodes_in_area(lua_State *L)
{
GET_ENV_PTR;

INodeDefManager *ndef = getServer(L)->ndef();
v3s16 minp = read_v3s16(L, 1);
v3s16 maxp = read_v3s16(L, 2);
std::set<content_t> filter;
if(lua_istable(L, 3)) {
int table = 3;
lua_pushnil(L);
while(lua_next(L, table) != 0) {
// key at index -2 and value at index -1
luaL_checktype(L, -1, LUA_TSTRING);
ndef->getIds(lua_tostring(L, -1), filter);
// removes value, keeps key for next iteration
lua_pop(L, 1);
}
} else if(lua_isstring(L, 3)) {
ndef->getIds(lua_tostring(L, 3), filter);
}

lua_newtable(L);
u64 i = 0;
for(s16 x = minp.X; x <= maxp.X; x++)
for(s16 z = minp.Z; z <= maxp.Z; z++) {
s16 y = minp.Y;
v3s16 p(x, y, z);
content_t c = env->getMap().getNodeNoEx(p).getContent();
for(; y <= maxp.Y; y++) {
v3s16 psurf(x, y + 1, z);
content_t csurf = env->getMap().getNodeNoEx(psurf).getContent();
if(c != CONTENT_AIR && csurf == CONTENT_AIR &&
filter.count(c) != 0) {
push_v3s16(L, v3s16(x, y, z));
lua_rawseti(L, -2, ++i);
}
c = csurf;
}
}
return 1;
}

// get_perlin(seeddiff, octaves, persistence, scale)
// returns world-specific PerlinNoise
int ModApiEnvMod::l_get_perlin(lua_State *L)
@@ -867,6 +912,7 @@ void ModApiEnvMod::Initialize(lua_State *L, int top)
API_FCT(get_gametime);
API_FCT(find_node_near);
API_FCT(find_nodes_in_area);
API_FCT(find_surface_nodes_in_area);
API_FCT(delete_area);
API_FCT(get_perlin);
API_FCT(get_perlin_map);
@@ -119,6 +119,10 @@ class ModApiEnvMod : public ModApiBase {
// nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
static int l_find_nodes_in_area(lua_State *L);

// find_surface_nodes_in_area(minp, maxp, nodenames) -> list of positions
// nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
static int l_find_surface_nodes_in_area(lua_State *L);

// delete_area(p1, p2) -> true/false
static int l_delete_area(lua_State *L);

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