let each file register its own constants with Lua

stepmania/src/LuaManager.h

@@ -4,6 +4,7 @@
 struct lua_State;
 typedef void (*RegisterWithLuaFn)(lua_State*);
 
+
 class LuaManager
 {
 public:
@@ -69,6 +70,10 @@ public:
 
 extern LuaManager *LUA;
 
+#define REGISTER_WITH_LUA_FUNCTION( Fn ) \
+	class Register##Fn { public: Register##Fn() { LuaManager::Register( Fn ); } }; \
+	static Register##Fn register##Fn;
+
 #endif
 
 /*

stepmania/src/PlayerNumber.cpp

@@ -3,8 +3,16 @@
 #include "ThemeManager.h"
 #include "GameState.h"
 #include "CommonMetrics.h"
+#include "LuaManager.h"
 
 
+void LuaPlayerNumber(lua_State* L)
+{
+	FOREACH_PlayerNumber( pn )
+		LUA->SetGlobal( ssprintf("PLAYER_%d",pn+1), pn );
+}
+REGISTER_WITH_LUA_FUNCTION( LuaPlayerNumber );
+
 PlayerNumber GetNextHumanPlayer( PlayerNumber pn )
 {
 	for( PlayerNumber p=(PlayerNumber)(pn+1); p<NUM_PLAYERS; ((int&)p)++ )

stepmania/src/ThemeManager.cpp

@@ -282,8 +282,6 @@ void ThemeManager::UpdateLuaGlobals()
 	LUA->SetGlobal( "SCREEN_BOTTOM", (int) SCREEN_BOTTOM );
 	LUA->SetGlobal( "SCREEN_CENTER_X", (int) SCREEN_CENTER_X );
 	LUA->SetGlobal( "SCREEN_CENTER_Y", (int) SCREEN_CENTER_Y );
-	FOREACH_PlayerNumber( pn )
-		LUA->SetGlobal( ssprintf("PLAYER_%d",pn+1), pn );
 
 	/* Run all script files in Lua for all themes.  Start from the deepest fallback
 	 * theme and work outwards. */