Lua: add gui.register and emu.message

Note: using emu.message in the callback function of gui.register causes infinite recursive call and the script will die.

gfx.cpp

@@ -186,6 +186,7 @@
 #include "screenshot.h"
 #include "font.h"
 #include "display.h"
+#include "lua-engine.h"
 
 extern struct SCheatData		Cheat;
 extern struct SLineData			LineData[240];
@@ -433,6 +434,9 @@ void S9xEndScreenRefresh (void)
 			if (Settings.AutoDisplayMessages)
 				S9xDisplayMessages(GFX.Screen, GFX.RealPPL, IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight, 1);
 
+#ifdef HAVE_LUA
+	CallRegisteredLuaFunctions(LUACALL_AFTEREMULATIONGUI);
+#endif
 			S9xDeinitUpdate(IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight);
 		}
 	}

lua-engine.cpp

@@ -3,6 +3,7 @@
 
 #include "port.h"
 #include "snes9x.h"
+#include "display.h"
 #include "lua-engine.h"
 #include <assert.h>
 #include <vector>
@@ -1020,14 +1021,14 @@ DEFINE_LUA_FUNCTION(print, "...")
 }
 
 
-/*
+
 DEFINE_LUA_FUNCTION(emu_message, "str")
 {
 	const char* str = toCString(L);
-	osd->addLine(str);
+	S9xSetInfoString(str);
 	return 0;
 }
-*/
+
 
 // provides an easy way to copy a table from Lua
 // (simple assignment only makes an alias, but sometimes an independent table is desired)
@@ -3694,7 +3695,7 @@ static const struct luaL_reg emulib [] =
 	{"registerstart", emu_registerstart},
 	{"registerexit", emu_registerexit},
 	{"persistglobalvariables", emu_persistglobalvariables},
-//	{"message", emu_message},
+	{"message", emu_message},
 	{"print", print}, // sure, why not
 	{"openscript", emu_openscript},
 //	{"loadrom", emu_loadrom},

win32/win32_display.cpp

@@ -183,6 +183,7 @@
 #include "../snes9x.h"
 #include "../ppu.h"
 #include "../font.h"
+#include "../lua-engine.h"
 #include "wsnes9x.h"
 #include "win32_display.h"
 #include "CDirect3D.h"
@@ -221,6 +222,10 @@ void WinRefreshDisplay(void)
 	if(!Src.Width)
 		return;
 
+#ifdef HAVE_LUA
+	CallRegisteredLuaFunctions(LUACALL_AFTEREMULATIONGUI);
+#endif
+
 	SelectRenderMethod ();
 
 	S9xDisplayOutput->Render(Src);