add: lua func

src/logic/scripting/lua/libcore.cpp

@@ -11,6 +11,7 @@
 #include "../../../window/Events.hpp"
 #include "../../../window/Window.hpp"
 #include "../../../world/WorldGenerators.hpp"
+#include "../../../constants.hpp"
 
 #include <vector>
 #include <memory>
@@ -158,6 +159,35 @@ static int l_get_generators(lua::State* L) {
     return 1;
 }
 
+static int l_get_constants(lua::State* L) {
+
+    lua::createtable(L, 0, 20);
+
+    const std::pair<const char*, int> numberConstants[] = {
+        {"ENGINE_VERSION_MAJOR", ENGINE_VERSION_MAJOR},
+        {"ENGINE_VERSION_MINOR", ENGINE_VERSION_MINOR},
+        {"BLOCK_AIR", BLOCK_AIR},
+        {"ITEM_EMPTY", ITEM_EMPTY},
+        {"CHUNK_W", CHUNK_W},
+        {"CHUNK_H", CHUNK_H},
+        {"CHUNK_D", CHUNK_D},
+        {"VOXEL_USER_BITS", VOXEL_USER_BITS},
+        {"VOXEL_USER_BITS_OFFSET", VOXEL_USER_BITS_OFFSET},
+        {"ITEM_ICON_SIZE", ITEM_ICON_SIZE},
+        {"CHUNK_VOL", CHUNK_VOL},
+        {"BLOCK_VOID", BLOCK_VOID},
+        {"ITEM_VOID", ITEM_VOID},
+        {"MAX_BLOCKS", MAX_BLOCKS}
+    };
+
+    for (const auto& constant : numberConstants) {
+        lua::pushnumber(L, constant.second);
+        lua::setfield(L, constant.first);
+    }
+
+    return 1;
+}
+
 const luaL_Reg corelib [] = {
     {"new_world", lua::wrap<l_new_world>},
     {"open_world", lua::wrap<l_open_world>},
@@ -172,5 +202,6 @@ const luaL_Reg corelib [] = {
     {"quit", lua::wrap<l_quit>},
     {"get_default_generator", lua::wrap<l_get_default_generator>},
     {"get_generators", lua::wrap<l_get_generators>},
+    {"get_constants", lua::wrap<l_get_constants>},
     {NULL, NULL}
 };