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Expose terrains[], terrains.iterate and #terrains to Lua

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This commit is contained in:
JugadorXEI 2025-03-17 17:17:36 +01:00
parent b592295a6c
commit c35b2764a1
1 changed files with 79 additions and 0 deletions
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79
src/lua_terrainlib.c
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@ -461,6 +461,75 @@ static int terrain_num(lua_State *L)
return 1; return 1;
} }
static int lib_iterateTerrains(lua_State *L)
{
size_t i;
if (lua_gettop(L) < 2)
{
lua_pushcfunction(L, lib_iterateTerrains);
return 1;
}
lua_settop(L, 2);
lua_remove(L, 1); // state is unused.
if (!lua_isnil(L, 1))
i = K_GetTerrainHeapIndex(*(terrain_t **)luaL_checkudata(L, 1, META_TERRAIN)) + 1;
else
i = 0;
// terrains are always valid, only added, never removed
if (i < K_GetNumTerrainDefs())
{
LUA_PushUserdata(L, K_GetTerrainByIndex(i), META_TERRAIN);
return 1;
}
return 0;
}
static int lib_getTerrain(lua_State *L)
{
const char *field;
size_t i;
// find terrain by number
if (lua_type(L, 2) == LUA_TNUMBER)
{
i = luaL_checkinteger(L, 2);
if (i >= K_GetNumTerrainDefs())
return luaL_error(L, "terrains[] index %d out of range (0 - %d)", i, K_GetNumTerrainDefs()-1);
LUA_PushUserdata(L, K_GetTerrainByIndex(i), META_TERRAIN);
return 1;
}
field = luaL_checkstring(L, 2);
// special function iterate
if (fastcmp(field,"iterate"))
{
lua_pushcfunction(L, lib_iterateTerrains);
return 1;
}
// find terrain by name
terrain_t *byname = K_GetTerrainByName(field);
if (byname != NULL)
{
LUA_PushUserdata(L, byname, META_TERRAIN);
return 1;
}
return 0;
}
static int lib_numTerrains(lua_State *L)
{
lua_pushinteger(L, K_GetNumTerrainDefs());
return 1;
}
int LUA_TerrainLib(lua_State *L) int LUA_TerrainLib(lua_State *L)
{ {
luaL_newmetatable(L, META_SPLASH); luaL_newmetatable(L, META_SPLASH);
@ -506,6 +575,16 @@ int LUA_TerrainLib(lua_State *L)
lua_pushcfunction(L, terrain_num); lua_pushcfunction(L, terrain_num);
lua_setfield(L, -2, "__len"); lua_setfield(L, -2, "__len");
lua_pop(L,1); lua_pop(L,1);
lua_newuserdata(L, 0);
lua_createtable(L, 0, 2);
lua_pushcfunction(L, lib_getTerrain);
lua_setfield(L, -2, "__index");
lua_pushcfunction(L, lib_numTerrains);
lua_setfield(L, -2, "__len");
lua_setmetatable(L, -2);
lua_setglobal(L, "terrains");
return 0; return 0;
} }