toggleable lua support during build

CMakeLists.txt

@@ -50,6 +50,7 @@ option(USE_IMGUI_GL3 "Use OpenGL3+ imgui implementation" ON)
 option(WITH_OPENGL_MODERN "Compile with OpenGL modern renderer" ON)
 option(WITH_OPENGL_LEGACY "Compile with OpenGL legacy renderer" ON)
 option(WITH_UART "Compile with libserialport" ON)
+option(WITH_LUA "Compile with lua scripting support" ON)
 option(WITH_OPENVR "Compile with OpenVR" ON)
 option(WITH_ZMQ "Compile with cppzmq" OFF)
 option(WITH_CRASHPAD "Compile with crashpad" OFF)
@@ -108,7 +109,6 @@ set(SOURCES
 "drivermouseinput.cpp"
 "translation.cpp"
 "material.cpp"
-"lua.cpp"
 "stdafx.cpp"
 "messaging.cpp"
 "scene.cpp"
@@ -232,6 +232,11 @@ if (WITH_OPENVR)
         set(SOURCES ${SOURCES} "vr/openvr_imp.cpp")
 endif()
 
+if (WITH_LUA)
+	add_definitions(-DWITH_LUA)
+	set(SOURCES ${SOURCES} "lua.cpp")
+endif()
+
 if (WITH_OPENGL_MODERN)
         set(SOURCES ${SOURCES}
             "opengl33geometrybank.cpp"
@@ -424,9 +429,11 @@ endif()
 find_package(SndFile REQUIRED)
 target_link_libraries(${PROJECT_NAME} SndFile::sndfile)
 
-find_package(LuaJIT REQUIRED)
+if (WITH_LUA)
-include_directories(${LUAJIT_INCLUDE_DIR})
+	find_package(LuaJIT REQUIRED)
-target_link_libraries(${PROJECT_NAME} ${LUAJIT_LIBRARIES})
+	include_directories(${LUAJIT_INCLUDE_DIR})
+	target_link_libraries(${PROJECT_NAME} ${LUAJIT_LIBRARIES})
+endif()
 
 if (WITH_UART)
 	find_package(libserialport REQUIRED)

Event.cpp

@@ -2075,6 +2075,7 @@ friction_event::export_as_text_( std::ostream &Output ) const {
     Output << m_friction << ' ';
 }
 
+#ifdef WITH_LUA
 lua_event::lua_event(lua::eventhandler_t func) {
     lua_func = func;
 }
@@ -2118,6 +2119,7 @@ lua_event::export_as_text_( std::ostream &Output ) const {
 bool lua_event::is_instant() const {
 	return m_delay == 0.0 && m_delayrandom == 0.0;
 }
+#endif
 
 // prepares event for use
 void

Event.h

@@ -14,10 +14,13 @@ http://mozilla.org/MPL/2.0/.
 #include "Names.h"
 #include "EvLaunch.h"
 #include "Logs.h"
-#include "lua.h"
 #include "command.h"
 #include "comparison.h"
 
+#ifdef WITH_LUA
+#include "lua.h"
+#endif
+
 // common event interface
 class basic_event {
 
@@ -585,6 +588,7 @@ private:
     float m_friction{ -1.f };
 };
 
+#ifdef WITH_LUA
 class lua_event : public basic_event {
 public:
     lua_event(lua::eventhandler_t func);
@@ -599,6 +603,7 @@ private:
 
     lua::eventhandler_t lua_func = nullptr;
 };
+#endif
 
 class message_event : public basic_event {
 

simulation.cpp

@@ -41,9 +41,12 @@ instance_table Instances;
 vehicle_table Vehicles;
 train_table Trains;
 light_array Lights;
-lua Lua;
 particle_manager Particles;
 
+#ifdef WITH_LUA
+lua Lua;
+#endif
+
 scene::basic_region *Region { nullptr };
 TTrain *Train { nullptr };
 

simulation.h

@@ -11,11 +11,14 @@ http://mozilla.org/MPL/2.0/.
 
 #include "simulationstateserializer.h"
 #include "Classes.h"
-#include "lua.h"
 #include "Event.h"
 #include "Train.h"
 #include "particles.h"
 
+#ifdef WITH_LUA
+#include "lua.h"
+#endif
+
 namespace simulation {
 
 class state_manager {
@@ -78,8 +81,10 @@ extern vehicle_table Vehicles;
 extern train_table Trains;
 extern light_array Lights;
 extern sound_table Sounds;
-extern lua Lua;
 extern particle_manager Particles;
+#ifdef WITH_LUA
+extern lua Lua;
+#endif
 
 extern scene::basic_region *Region;
 extern TTrain *Train;

simulationstateserializer.cpp

@@ -319,7 +319,11 @@ void state_serializer::deserialize_lua( cParser &Input, scene::scratch_data &Scr
        Input.getTokens(1, false);
        std::string file;
        Input >> file;
+#ifdef WITH_LUA
        simulation::Lua.interpret(Global.asCurrentSceneryPath + file);
+#else
+       ErrorLog(file + ": lua scripts not supported in this build.");
+#endif
 }
 
 void