This page has been translated automatically.
视频教程
界面
要领
高级
实用建议
专业(SIM)
UnigineEditor
界面概述
资源工作流程
版本控制
设置和首选项
项目开发
调整节点参数
Setting Up Materials
设置属性
照明
Sandworm
使用编辑器工具执行特定任务
如何擴展編輯器功能
嵌入式节点类型
Nodes
Objects
Effects
Decals
光源
Geodetics
World Nodes
Sound Objects
Pathfinding Objects
Players
编程
基本原理
搭建开发环境
使用范例
C#
UnigineScript
UUSL (Unified UNIGINE Shader Language)
Plugins
File Formats
材质和着色器
Rebuilding the Engine Tools
GUI
VR Development
双精度坐标
应用程序接口
Animations-Related Classes
Containers
Common Functionality
Controls-Related Classes
Engine-Related Classes
Filesystem Functionality
GUI-Related Classes
Math Functionality
Node-Related Classes
Objects-Related Classes
Networking Functionality
Pathfinding-Related Classes
Physics-Related Classes
Plugins-Related Classes
IG Plugin
CIGIConnector Plugin
Rendering-Related Classes
VR-Related Classes
创建内容
内容优化
材质
Material Nodes Library
Miscellaneous
Input
Math
Matrix
Textures
Art Samples
Tutorials
注意! 这个版本的文档是过时的,因为它描述了一个较老的SDK版本!请切换到最新SDK版本的文档。
注意! 这个版本的文档描述了一个不再受支持的旧SDK版本!请升级到最新的SDK版本。

Callbacks

Warning
The scope of applications for UnigineScript is limited to implementing materials-related logic (material expressions, scriptable materials, brush materials). Do not use UnigineScript as a language for application logic, please consider C#/C++ instead, as these APIs are the preferred ones. Availability of new Engine features in UnigineScript (beyond its scope of applications) is not guaranteed, as the current level of support assumes only fixing critical issues.

Any function from system, world or editor scripts can be called in a C++ code. UnigineScript functions that are called from an external code are known as callbacks. Via callbacks scripts can communicate with each other, as well as with the external application.

  • Callbacks support up to 4 arguments and can return a value of an arbitrary type.

See also#

An example can be found in <UnigineSDK>/source/samples/Api/Scripts/Callbacks/ directory.

Callbacks Usage Example#

C++ Side#

To demonstrate how callbacks can be used, let's code the C++ part first. Here's code from your_project_name.cpp file:

Source code (C++)
#include <UnigineEngine.h>
#include <UnigineInterpreter.h>
#include <UnigineInterface.h>

#include "AppSystemLogic.h"
#include "AppWorldLogic.h"
#include "AppEditorLogic.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);
}

/*
*/
#ifdef _WIN32
	int wmain(int argc,wchar_t *argv[]) {
#else
	int main(int argc,char *argv[]) {
#endif

	// export the runWorldFunction() function defined above
	Unigine::Interpreter::addExternFunction("runWorldFunction", MakeExternFunction(&runWorldFunction));
	
	AppSystemLogic system_logic;
	AppWorldLogic world_logic;
	AppEditorLogic editor_logic;
	
	Unigine::EnginePtr engine(argc,argv);
	
	engine->main(&system_logic,&world_logic,&editor_logic);
	
	return 0;
}

The following code should be in AppWorldLogic.cpp

Source code (C++)
#include "AppWorldLogic.h"
#include "UnigineEditor.h"
#include "UnigineGame.h"

#include <UnigineInterpreter.h>


using namespace Unigine;
/*
 */
AppWorldLogic::AppWorldLogic() {
	
}

AppWorldLogic::~AppWorldLogic() {
	
}

/*
 */
int AppWorldLogic::init() {
	return 1;
}

int AppWorldLogic::shutdown() {
	return 1;
}

/*
 */
int AppWorldLogic::update() {
	/*
		Callbacks usage example
	*/

	// call the counter() function of the script
	Variable ret = Engine::get()->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 path to the world file
	if (ret.getInt() == 3) Log::message("\nworld-file path is: \"%s\"\n", Engine::get()->runWorldFunction(Variable("engine.world.getPath")).getString());

	return 1;
}

int AppWorldLogic::postUpdate() {
	return 1;
}

int AppWorldLogic::updatePhysics() {
	return 1;
}

/*
 */
int AppWorldLogic::save(const Unigine::StreamPtr &stream) {
	UNIGINE_UNUSED(stream);
	return 1;
}

int AppWorldLogic::restore(const Unigine::StreamPtr &stream) {
	UNIGINE_UNUSED(stream);
	return 1;
}

Unigine Script Side#

Notice
The required world should be loaded and the script assigned to this *.world should not contain any compilation errors.

The world script file where callbacks are defined:

Source code (UnigineScript)
// unigine_project.usc

/*
*/
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;
}

Calling Sequence#

The sequence of function call will be as follows:

  1. The interpreter exports the runWorldFunction() function to make it available from the script.
  2. The engine is initialized, and the init() function of the script is called. This function calls the exported runWorldFunction() function.
  3. The exported runWorldFunction() function calls the callback() function from the script.
  4. The engine enters the main loop, where it calls the counter() function from the script by using the Unigine::Engine::runWorldFunction() function.

Output#

The following result will be printed into the console:

Output
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 world-file path is: "unigine_project/unigine_project"
Last update: 2023-12-19
Build: ()