Running Syncker with AppProjection

If computers connected via Syncker use projectors instead of monitors to render an application, it is required to use the AppProjection plugin, which enables to configure the created projections over LAN.

See Also

1. Set a fixed FPS value to make simulations consistent across all computers and initialize Syncker in the script running on the master computer. Also you should initialize a console to allow running master command-line options.
   Source code (UnigineScript)

   int init() {
   	
   	engine.game.setFTime(1.0f / 60.0f);
   	Unigine::Syncker::Master::Console::init();
   	Unigine::Syncker::Master::init(master_address);
   	
   	return 1;
   }

2. In the init() function, create a world: add nodes, implement interaction logic, etc.

3. Get names of the slaves and add them to the interface of the Projection panel. It will allow you to choose the slave, whose projection should be configured from the master computer.

   The master should also be added to the interface of the Projection panel. It will allow you to clear the projection configuration on the master computer after configuring of the slaves' projections.

   Notice

   You should implement this logic in the init() function of the world script.
   Source code (UnigineScript)

   engine.system.call("projectionClearAuxiliary");
   // add the master to the Projection panel interface
   engine.system.call("projectionAddAuxiliaryItem","Master");
   forloop(int i = 0; Unigine::Syncker::Master::getNumSlaves()) {
   	string name = Unigine::Syncker::Master::getSlaveName(i);
   	string address = Unigine::Syncker::Master::getSlaveAddress(i);
   	engine.system.call("projectionAddAuxiliaryItem",format("%s (%s)",name,address));
   }

4. Set custom callback functions in the init() function of the world script.
   Notice

   The wallSetChangedWorldCallback() and projectionSetChangedWorldCallback() functions are specified in the wall.h and projection.h scripts respectively and receive the identifiers of the custom callback functions.
   Source code (UnigineScript)

   engine.system.call("wallSetChangedWorldCallback",functionid(my_wall_changed_callback));
   engine.system.call("projectionSetChangedWorldCallback",functionid(my_projection_changed_callback));

5. Implement the custom callback function my_wall_changed_callback(), which has been set in the previous step and will be invoked when the Bezel X and Bezel Y settings are changed in the Wall tab.
   Notice

   The wallGetBezelX(), wallGetBezelY(), wallSetBezelX(), wallSetBezelY() functions are defined in the data/core/scripts/system/wall.h script.
   Source code (UnigineScript)

   void my_wall_changed_callback() {
   	
   	// get the currently changed values of bezel parameters
   	float bezel_x = engine.system.call("wallGetBezelX");
   	float bezel_y = engine.system.call("wallGetBezelY");
   	// set this values as current for all of the slaves via the system script functions
   	Unigine::Syncker::Master::systemCall(~0,"wallSetBezelX",(bezel_x));
   	Unigine::Syncker::Master::systemCall(~0,"wallSetBezelY",(bezel_y));
   }

   Another way to set the changed values is to run the slave_bezel console command from the script on each slave.
   Notice

   Use the code below instead of calling the wallSetBezelX() and wallSetBezelY() functions.
   Source code (UnigineScript)

   // run the slave_bezel console command on all of the slaves to update their bezel compensation 
   Unigine::Syncker::Master::systemCall(~0,"engine.console.run",(format("slave_bezel %f %f",bezel_x,bezel_y)));

6. Implement the my_projection_changed_callback() callback function, which has been set in the step 3 and will be invoked when you change the projection settings on the Projection panel:
   Notice

   The system script functions called below are defined in the data/core/scripts/system/projection.h file.
   Source code (UnigineScript)

   void my_projection_changed_callback() {
   	
   	// update grid mode if it was changed
   	if(engine.system.call("projectionGetActivity")) {
   		int mode = engine.system.call("projectionGetGridMode");
   		int step = engine.system.call("projectionGetGridStep");
   		Unigine::Syncker::Master::systemCall(~0,"projectionSetGrid",(mode,step));
   	} else {
   		Unigine::Syncker::Master::systemCall(~0,"projectionClearGrid",());
   	}
   		
   	// update projection parameters for the chosen projection
   	int item = engine.system.call("projectionGetAuxiliaryItem");
   	if (item != 0) {
   		int mask = 1 << (item - 1);
   		Buffer buffer = new Buffer();
   		engine.projection.saveState(class_cast(classid(Stream),buffer));
   		// restore the state of the slave display
   		Unigine::Syncker::Master::systemStream(mask,"engine.projection.restoreState",buffer);
   		delete buffer;
   	}
   	
   }

7. Implement logic, which allows loading the world for all of the slaves on the master side, and call it in the init() function after the Syncker initialization.
   Notice

   You can skip this step and load the world on each slave individually via the console.
   Source code (UnigineScript)

   void sync_world() {
   	
   	// load slave world
   	Unigine::Syncker::Master::systemCall(~0,"engine.console.run",("world_load " + engine.world.getName()));
   		
   	// waiting for the slave world
   	int ret[0];
   	float begin = clock();
   		
   	while(clock() - begin < 2.0f) {
   		int is_loaded = 1;
   		Unigine::Syncker::Master::systemCall(~0,"engine.world.isLoaded",(),ret);
   		foreach(int i = 0; ret) is_loaded &= i;
   		if(is_loaded) break;
   	}
   }

8. Implement shut down logic for the console and Syncker, clear the slaves' names and system script callbacks:
   Source code (UnigineScript)

   int shutdown() {
   
   	// clear slaves' names
   	engine.system.call("projectionClearAuxiliary");
   		
   	// clear system script callbacks
   	engine.system.call("wallSetChangedWorldCallback",NULL);
   	engine.system.call("projectionSetChangedWorldCallback",NULL);
   	
   	// quit the slave world
   	Unigine::Syncker::Master::systemCall(~0,"engine.console.run",("world_quit"));
   	
   	// Shut down the console
   	Unigine::Syncker::Master::Console::shutdown();
   	
   	// shutdown Syncker
   	Unigine::Syncker::Master::shutdown();
   		
   	return 1;
   }

9. Implement synchronization logic in the render() function.
   Source code (UnigineScript)

   int render() {
   	
   	// synchronize frame
   	Unigine::Syncker::Master::syncFrame();
   	
   	// synchronize player
   	Unigine::Syncker::Master::syncPlayer();
   	
   	// synchronize render
   	Unigine::Syncker::Master::syncRender();
   	
   	// synchronize end
   	Unigine::Syncker::Master::syncEnd();
   	
   	return 1;
   }

If you use the same world script on the master and slave sides, you need to wrap your code around with #ifndef DEFINE_NAME ... #else ... #endif as follows to separate the script logic:

#include <core/unigine.h>

// logic to run on the master
#ifndef DEFINE_NAME

	#include <core/systems/syncker/syncker_master.h>
	#include <core/systems/syncker/syncker_master_console.h>
	
	// init() function defined above
	// shutdown() functions defined above
	// render() function defined above
	// implementation of the custom callback functions
	
#else

	// logic to run on a slave
	int init() {

		// slave logic implementation
	
		return 1;
	}
	
#endif

To run Syncker with the AppProjection plugin, perform the following:

1. On the slave application start-up, override a default editor script with the Syncker script for slaves, activate the AppProjection plugin and specify the PROJECTION_USER and DEFINE_NAME definitions:
   Notice

   Do not forget to add the other required start-up arguments.
   Shell commands

   main_x86 -data_path "../" -editor_script "core/systems/syncker/syncker_slave.cpp" -extern_plugin "AppProjection" -extern_define "PROJECTION_USER,DEFINE_NAME" -console_command "editor_reload"

   The editor_reload console command is required to load the Syncker script for slaves.

   The PROJECTION_USER definition is used to avoid overwriting the camera configuration by the core/scripts/system/wall.h script. It disables the Wall::render() function and allows you to configure slave projections manually.

2. Run the application on the master computer
   Shell commands

   main_x86 -data_path "../" -extern_plugin "AppProjection" -console_command ""world_load unigine_project/unigine_project"

3. Change the broadcasting network address of the master:
   Source code

   master_address xxx.xxx.xxx.xxx

   And reload the world by using the world_reload console option.

By default all computers project the same screen as a master computer. So, after launching your application on the master and slave computers, you need to configure a viewport of each slave depending on the required screen configuration and then adjust each projection.

Changing Screen Configuration

Changing Projections