[lua] added API macros. looks to be pretty nifty!

CMakeLists.txt

@@ -242,6 +242,8 @@ add_library(topaz STATIC
 	src/tz/io/image.hpp
 
 	# tz::lua
+	src/tz/lua/api.hpp
+	src/tz/lua/lua.hpp
 	src/tz/lua/state.cpp
 	src/tz/lua/state.hpp
 

src/tz/lua/api.hpp

@@ -0,0 +1,21 @@
+#ifndef TZ_LUA_API_HPP
+#define TZ_LUA_API_HPP
+#include "tz/lua/state.hpp"
+#include "tz/core/debug.hpp"
+
+#define LUA_BEGIN(name) int luafn_##name(void* state){
+
+#define LUA_END }
+#define LUA_REGISTER(name) tz::lua::for_all_states([](tz::lua::state& s){s.assign_func(#name, luafn_##name);});
+
+// example: define in a TU
+//LUA_BEGIN(test_me_please)
+//	tz::report("test successful!");
+//	return 0;
+//LUA_END
+
+// usage: somewhere during runtime, invoke:
+// LUA_REGISTER(test_me_please)
+// which makes the function resident to all lua states on both the main thread and the job system worker threads.
+
+#endif // TZ_LUA_API_HPP