为自定义项目实现同步器逻辑

First of all, you should initialize Syncker. To do so you can simply add the following code to the AppSystemLogic class for both Master and Slave applications.首先，您应该初始化 Syncker。为此，您可以简单地将以下代码添加到 Master 和 Slave 应用程序的 AppSystemLogic 类中。

Insert the following Syncker initialization code to the AppSystemLogic::init() method:将以下 Syncker 初始化代码插入到 AppSystemLogic::init() 方法中：

#include "AppSystemLogic.h"
#include <plugins/Unigine/Syncker/UnigineSyncker.h>

 /* .. */

using namespace Unigine;
using namespace Plugins;

/* .. */

int AppSystemLogic::init()
{
	// update application even if focus was lost
	Engine::get()->setBackgroundUpdate(Engine::BACKGROUND_UPDATE_RENDER_NON_MINIMIZED);

	// get the Syncker manager interface
	Syncker::Manager* syncker_manager = Syncker::Manager::get();

	// initialize the Syncker using command line arguments
	// or you can initialize Syncker as Master or Slave directly
	//	via initMaster() or initSlave() methods without using command-line arguments
	syncker_manager->initSyncker();

	// enable debug information in right bottom corner
	syncker_manager->getSyncker()->setDebug(true);

	return 1;
}

In the AppWorldLogic.cpp file add the code to get the pointer to the manager and Master interface for further use in the AppWorldLogic::init() method:在 AppWorldLogic.cpp 文件中添加代码以获取指向 manager 和 Master 接口的指针，以便在 AppWorldLogic::init() 方法中进一步使用：

#include "AppWorldLogic.h"
#include <plugins/Unigine/Syncker/UnigineSyncker.h>
#include <UnigineWorld.h>
#include <UnigineGame.h>

using namespace Unigine;
using namespace Plugins;
using namespace Math;

int AppWorldLogic::init()
{

	Syncker::Manager *syncker_manager = Syncker::Manager::get();
	if (syncker_manager && syncker_manager->isMasterInitialized())
		syncker_master = syncker_manager->getMaster();

	return 1;
}

Objects of the following types are synchronized automatically: ObjectWaterGlobal, ObjectCloudLayer, ObjectParticles, WorldLight if they present in the *.world file on all computers.以下类型的对象会自动同步： ObjectWaterGlobal, ObjectCloudLayer, ObjectParticles, WorldLight 如果它们出现在所有计算机上的 *.world 文件中。

Synchronization of transformations is supported for all types of nodes. As for other type-specific parameters synchronization is available only for the following ones:所有类型的节点都支持转换同步。至于其他类型特定的参数同步仅适用于以下参数：

注意

Automatic synchronization of run-time changes of the Global Terrain object is not supported, but it can be implemented manually using custom messages.不支持自动同步 Global Terrain 对象的运行时更改，但可以手动实现使用自定义消息.

To start synchronizing other nodes or materials (the logic is the same for both), that exist in the world, you just need to tell Syncker which of them you want. To do so you can add the following code to the AppWorldLogic::init() method of your master application:要开始同步世界上存在的其他节点或材质（两者的逻辑相同），您只需要告诉 Syncker 您想要其中的哪一个。为此，您可以将以下代码添加到主应用程序的 AppWorldLogic::init() 方法中：

int AppWorldLogic::init()
{

/* ... */

	// checking if we have a Master interface
	if (syncker_master)
	{
		// getting a pointer for the node named "material_ball"
		NodePtr my_node = World::getNodeByName("material_ball");

		// add the existing node to synchronization
		syncker_master->addSyncNode(my_node, Syncker::Master::SYNC_MASK::TRANSFORM);
	}

	return 1;
}

Now, you can implement your logic for synchronized nodes in the AppWorldLogic::update() method for Master:现在，您可以在 Master 的 AppWorldLogic::update() 方法中实现同步节点的逻辑：

int AppWorldLogic::update()
{

	/* ... */

	// checking if we have a Master interface
	if (syncker_master)
	{
		// getting a pointer for the node named "material_ball"
		NodePtr my_node = World::getNodeByName("material_ball");

		// changing node's rotation
		my_node->setRotation(my_node->getRotation() * Math::quat(0, 0, Game::getIFps()));
	}

	return 1;
}

You can create and delete nodes at run time. To synchronize creation of a node on all connected Slave PCs, use the createNode() function.您可以在运行时创建和删除节点。要在所有连接的 Slave PC 上同步节点的创建，请使用 createNode() 函数。

注意

Please note, that the createNode() method support only a limited number of node types, so it is recomended to load nodes from *.node files instead.请注意，createNode() 方法仅支持有限数量的节点类型，因此建议使用负载节点来自 *.node 文件。

/* ... */
int cube_created = 0;

int AppWorldLogic::update()
{

	/* ... */

	// checking if we have a Master interface and cube is not yet created
	if (syncker_master && !cube_created)
	{
		// creating a dynamic cube and set up its transformation
		ObjectMeshStaticPtr dynamic_cube = ObjectMeshStatic::create("core/meshes/box.mesh");
		dynamic_cube->setPosition(Math::Vec3(Game::getRandomFloat(-50, 50), Game::getRandomFloat(-50, 50), Game::getRandomFloat(0, 50)));
		dynamic_cube->setRotation(Math::quat(Game::getRandomFloat(0, 360), Game::getRandomFloat(0, 360), Game::getRandomFloat(0, 360)));

		// commanding Slaves to create a dynamic node and adding it to synchronization
		syncker_master->createNode(dynamic_cube);

		cube_created = 1;
	}

	return 1;
}

To synchronize node loading from a *.node file on all connected Slave PCs, use the loadNode() or loadNodereference() methods. This approach is recommended as it allows adding nodes of all types, unlike the createNode() method that supports only a limited number of them.要从所有连接的 Slave PC 上的 *.node 文件同步节点加载，请使用 loadNode() 或 loadNodereference() 方法。推荐使用这种方法，因为它允许添加所有类型的节点，这与仅支持有限数量的 createNode() 方法不同。

/* ... */
int node_loaded = 0;

int AppWorldLogic::update()
{

	/* ... */

	// checking if we have a Master interface and our node is not yet loaded
	if (syncker_master && !node_loaded)
	{

		// commanding Slaves to load a node and adding it to synchronization
		syncker_master->loadNode("my_node.node", Syncker::Master::SYNC_MASK::NODE_FLAGS | Syncker::Master::SYNC_MASK::TRANSFORM);

		node_loaded = 1;
	}

	return 1;
}

Let us consider the following simple example: we can set transformation for a node, by simply sending rotation and position via a user message.让我们考虑下面这个简单的例子：我们可以为一个节点设置变换，只需通过一个用户留言.

1. First step is to create an object on Master and on all Slave PCs as a static one (without adding it to synchronization).第一步是在 Master 和所有 Slave PC 上创建一个对象作为静态对象（不将其添加到同步中）。

2. Next, we implement a callback function:接下来，我们实现一个回调函数：

   • on_message_received — to be called on receiving a user message. Here we extract the parameters from the received message and use them (in this case to change node's transformation).on_message_received — 在接收用户消息时调用。在这里，我们从接收到的消息中提取参数并使用它们（在本例中用于更改节点的转换）。

3. And the last step is to set this callback using the setMessageReceivedCallback() method in AppWorldLogic::init()最后一步是使用 AppWorldLogic::init() 中的 setMessageReceivedCallback() 方法设置此回调

   源代码 (C++)

   // declaring and initializing pointers for the Master, Slave, and Syncker instances
   Unigine::Plugins::Syncker::Master* master = nullptr;
   Unigine::Plugins::Syncker::Slave* slave = nullptr;
   Unigine::Plugins::Syncker::Syncker* syncker = nullptr;
   
   // declaring a node, that we are going to transform via user messages
   NodePtr node;
   
   // declaring a blob to store our messages
   Unigine::BlobPtr blob = Unigine::Blob::create();
   
   // declaring message types to be used
   enum MESSAGE_TYPE
   {
   	REPORT,
   	TRANSFORM,
   };
   
   /* ... */
   
   /// callback function to be fired on receiving a user message
   void AppWorldLogic::on_message_received(const Unigine::BlobPtr& message)
   {
   	// reading an unsigned char from the blob defining message type (REPORT or TRANSFORM)
   	unsigned char type = message->readUChar();
   	switch (type)
   	{
   	case REPORT:
   	{
   		// printing to the console that we have received a message
   		Log::message("REPORT Message received!");
   	}
   	break;
   
   	case TRANSFORM:
   	{
   		// reading position and rotation from the message and using them to update node's transformation
   		Vec3 pos = Vec3(message->readDVec3());
   		quat rot = message->readQuat();
   		node->setTransform(translate(pos) * Mat4(rotate(rot)));
   	}
   	break;
   	}
   }
   
   int AppWorldLogic::init()
   {
   
      /* ... */
   	
   	// trying to get a Manager interface
   	auto manager = Syncker::Manager::get();
   	if (manager)
   	{
   		// checking if we have a Master interface
   		if (manager->isMasterInitialized())
   			master = manager->getMaster();
   		else if (manager->isSlaveInitialized())
   			slave = manager->getSlave();
   
   		// getting a pointer to Master/Slave base class
   		syncker = manager->getSyncker();
   	}
   
   	// subscribing to network messages
   	if (syncker)
   		syncker->setMessageReceivedCallback("net", MakeCallback(this, &AppWorldLogic::on_message_received));
   
   	/* ... */
   
   	// somewhere in code... sending a REPORT message
   	blob->clear();
   	blob->writeUChar(REPORT);
   	syncker->sendMessage("net", blob);
   
   	return 1;
   }
   
   int AppWorldLogic::update()
   {
   
   	/* ... */
   
   	// sending a message with object's transform to all peers
   	if (master)
   	{
   		Vec3 pos = node->getPosition();
   		quat rot = node->getRotation();
   		blob->clear();
   		blob->writeUChar(TRANSFORM);
   		blob->writeDVec3(dvec3(pos));
   		blob->writeQuat(rot);
   		syncker->sendMessage("net", blob);
   	}
   
   	/* ... */
   
   	return 1;
   }

Synchronizing Terrain Modifications

同步地形修改#

Plugins::Syncker::Manager* syncker_manager = nullptr;

ObjectTerrainGlobalPtr terrain;

/// Method updating the Terrain
void AppWorldLogic::update_terrain(int detail, float threshold, float width, float contrast)
{
	// apply parameters to terrain
	terrain->getDetail(detail)->setMaskThreshold(threshold);
	terrain->getDetail(detail)->setMaskWidth(width);
	terrain->getDetail(detail)->setMaskContrast(contrast);

	if (syncker_manager)
	{
		auto master = syncker_manager->getMaster();
		if (master)
		{
			// send the "terrain_update" message with parameters
			BlobPtr blob = Blob::create();
			blob->writeInt(detail);
			blob->writeFloat(threshold);
			blob->writeFloat(width);
			blob->writeFloat(contrast);

			master->sendMessage("terrain_update", blob);
		}
	}
}

void AppWorldLogic::on_terrain_update(const Unigine::BlobPtr& message)
{
	// read parameters from the message in the same order
	int detail = message->readInt();
	float threshold = message->readFloat();
	float width = message->readFloat();
	float contrast = message->readFloat();
	// invoke update_terrain to apply parameters
	update_terrain(detail, threshold, width, contrast);
}

int AppWorldLogic::init()
{

	// getting the terrain object (this operation is performed once, so it should be in the init() method)
	terrain = checked_ptr_cast<ObjectTerrainGlobal>(World::getNodeByType(Node::OBJECT_TERRAIN_GLOBAL));

	// for Slave
	syncker_manager = Plugins::Syncker::Manager::get();
	if (syncker_manager)
	{
		auto slave = syncker_manager->getSlave();
		if (slave)
		{
			// set the on_terrain_update() method to be called on receiving the "terrain_update" message by a Slave.
			slave->setMessageReceivedCallback("terrain_update", MakeCallback(this, &AppWorldLogic::on_terrain_update));
		}
	}

	return 1;
}

int AppWorldLogic::update()
{

	 // for the Master
	if (Input::isKeyPressed(Input::KEY_T))
	{
		update_terrain(1, 2.0, 3.0f, 4.0f);
	}

	return 1;
}

You can change the viewport on the Master or Slave side. For this purpose you can use the following code (example):您可以更改 Master 或 Slave 侧的视口。为此，您可以使用以下代码（示例）：

Plugins::Syncker::Manager* syncker_manager = nullptr;

	
	/* ...

	perform checks if the Syncker plugin is loaded
	and get the Syncker manager interface (Manager)

	 ... */

	 // if syncker is initialized, assigning the config mesh surface named "surface_0" to the 2nd monitor
	if (syncker_manager->isSynckerInitialized())
		syncker_manager->getSyncker()->setView(1, "surface_0");

	/* ... */

You can also tell Slave to use another camera. To do so, you can use the following code (example):您还可以告诉 Slave 使用另一台相机。为此，您可以使用以下代码（示例）：

/* ... */

PlayerSpectatorPtr aux_player = nullptr;

/* ... */

int AppWorldLogic::update()
{

	/* ... */

	// checking if we have a Master interface
	if (syncker_master && !aux_player)
	{
		// creating a new auxiliary player (on Master and Slaves)
		aux_player = PlayerSpectator::create();
		aux_player->setPosition(Vec3(0.0f, -40.0f, 200.0f));
		aux_player->setDirection(vec3(0.0f, 1.0f, 0.0f), vec3_up);
		aux_player->setMinVelocity(10);
		aux_player->setMaxVelocity(aux_player->getMinVelocity() * 2);

		// commanding Slaves to create a new player and adding it to synchronization
		syncker_master->createNode(aux_player, ~0);

		// setting a new created player for Slave(s) having sync_view = "view_1"
		syncker_master->setSlavePlayer("view_1", aux_player);
	}

	/* ... */

	return 1;
}