Callbacks

#include <Unigine.h>
#include <UnigineInterpreter.h>

using namespace Unigine;

/******************************************************************************\
*
* World function
*
\******************************************************************************/

/*
*/
const Variable &runWorldFunction(const Variable &name,const Variable &v) {
	
	Log::warning("runWorldFunction(%s,%s) is called\n",name.getTypeName().get(),v.getTypeName().get());
	
	Engine *engine = Engine::get();
	return engine->runWorldFunction(name,v);
}

/******************************************************************************\
*
* Main
*
\******************************************************************************/

/*
*/
int main(int argc,char **argv) {
	
	// export the runWorldFunction() function defined above
	Interpreter::addExternFunction("runWorldFunction",MakeExternFunction(&runWorldFunction));
	
	// initialize the engine
	Engine *engine = Engine::init(UNIGINE_VERSION,argc,argv);
	
	// start the main loop
	while(engine->isDone() == 0) {
		
		engine->update();
		engine->render();
		engine->swap();
		
		// call the counter() function of the script (defined below)
		Variable ret = engine->runWorldFunction(Variable("counter"));
		// print a message depending on the value returned by the counter() script function:
		// print the current value of the counter
		if(ret.getInt() != -1) Log::message("counter is: %d\n",ret.getInt());
		// print the world name
		if(ret.getInt() == 3) Log::message("\nworld name is: \"%s\"\n",engine->runWorldFunction(Variable("engine.world.getName")).getString());
	}
	
	// shut down the engine and call the shutdown() function in the loaded world script
	Engine::shutdown();
	
	return 0;
}

// my_world.cpp

/*
*/
int callback(int value) {
	
	log.warning("callback(%s) is called\n",typeinfo(value));
	
	return value;
}

/*
*/
void counter() {
	
	for(int i = 0; i < 4; i++) {
		log.warning("counter(): called\n");
		yield i;
	}
	
	return -1;
}

/*
*/
int init() {
	
	log.message("\n");
	
	// run the callback() script function via the API runWorldFunction() function
	log.message("result is: %s\n\n",typeinfo(runWorldFunction("callback",10)));
	log.message("result is: %s\n\n",typeinfo(runWorldFunction("callback",vec3(1,2,3))));
	log.message("result is: %s\n\n",typeinfo(runWorldFunction("callback","a string")));
	
	/////////////////////////////////
	
	// show a console
	engine.console.setActivity(1);
	
	return 1;
}

runWorldFunction(string,int): called
callback(int: 10): called
result is: int: 10

runWorldFunction(string,vec3): called
callback(vec3: 1 2 3): called
result is: vec3: 1 2 3

runWorldFunction(string,string): called
callback(string: "a string") is called
result is: string: "a string"

counter(): called
counter is: 0
counter(): called
counter is: 1
counter(): called
counter is: 2
counter(): called
counter is: 3

world name is: "data/callbacks"