Nov 30, 2019 Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time. Lua can call (and manipulate) functions written in Lua and functions written in C (see §3.4.10). Both are represented by the type function. The type userdata is provided to allow arbitrary C data to be stored in Lua variables. A userdata value represents a block of raw memory. A random map generator for Doom (community maintenance repo) - caligari87/Oblige.

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I’ve read a lot of documents about Lua calling C + + under cocos2d-x, but none of them really explained this. I’m a beginner myself, and I’ve been groping for a long time. The summary is as follows:

How to download clash of clans in pc for free. The reason why Lua calls C + + under cocos2d-x is so complicated that all the documents on the Internet are not clear because there are five knowledge points:

1. In pure C environment, register C functions into Lua environment to understand the essence of calling each other between Lua and C
2. In the cocos2d-x project, register pure C functions into Lua environment to understand how cocos2d-x creates Lua environment and how to get this environment and continue to customize it
3. Learn why to register C + + classes with tolua + +
4. In pure C + + environment, use tolua + + to register a C + + class into Lua environment to understand the usage of tolua + +
5. In the cocos2d-x project, the user-defined C + + class is registered into Lua environment by using the way of registering itself with cocos2d-x. it is understood how cocos2d-x encapsulates the usage of tolua + + by binding generator script to save workload

Only when you understand the first four layers, you will know clearly when using the binding generator script. On the other hand, the documents on the Internet either explain layer 1 or tell you how to use the binding generator script in layer 5. Not only do you not mention the important knowledge points in the middle, but also the sample code is not concise enough, which makes people who are dizzy when they see C + + understand it very much (it’s not that I don’t know C + +, but I don’t accept the design philosophy of C + +, If you can avoid it. Therefore, I will explain each layer of knowledge one by one. The sample code is not required to be complete and rigorous, but try to explain the key points of the program in the most concise way.

Layer 1: in pure C environment, register C functions into Lua environment

It’s much clearer to look at the code directly than to talk about a lot of concepts. Create an a.lua and A.C file. The contents are as follows. You can see what is going on

a.lua

a.c

How about it? Is the code simple? It’s easy to see that the simple can’t be simpler. I’m particularly annoyed by the fact that there are misjudgments and code comments in the sample code. It’s hard enough to see the code that I don’t know. I also add so many colorful interference items, which increases the learning burden.

Use GCC to compile and execute on the command line

be careful-lluaOption is necessary because you want to connect to Lua’s library.

After reading the code above, it is much easier to explain it

1. To register in Lua environment, the function needs to be defined as follows:int xxx(lua_State *L)
2. Uselua_tonumber、lua_tostringTo get the parameters passed in, such aslua_tonumber(L, 1)Is to get the first parameter passed in, and the type is a number
3. Uselua_pushnumber、lua_pushstringBecause Lua supports functions to return multiple values, you can push multiple return values into Lua environment
4. The number returned by the final function indicates how many return values have been pushed into the Lua environment
5. Uselua_registerMacro definition to register this function into Lua environment, Lua script can use it, finished! That’s it!

The second layer: register C function into Lua environment in cocos2d-x environment

It’s also simple:

1. Inframeworks/runtime-src/Classes/Directory, findAppDelegate.cppDocuments. If the frameworks directory does not exist, you need to refer to this blog:How to write Lua with cocos code IDE and how to get along with C + + code in the project

AppDelegate.cpp The key codes in the document are as follows:
“`c++
auto engine = LuaEngine::getInstance();
ScriptEngineManager::getInstance()->setScriptEngine(engine);

It can also be done throughScriptEngineManagerClass gets the currentLuaEngineObject, and thengetLuaStack()Method to get the encapsulatedLuaStackObject, and then callgetLuaState()The originallua_StateStructure pointer. As long as you know the location of the entrance, everything else will not be a problem. It is still quite simple.

You can have a look if you are interestedScriptEngineManagerClass is defined in theframeworks/cocos2d-x/cocos/base/CCScriptSupport.hFile.

BTW: there is also a little knowledge point, which is inserted in the AppDelegate.cpp Try to write the custom code inCOCOS2D_DEBUGIn the macro definition, the code executed in the debugging environment is different from that in the real machine environment

2. Next, find a placetest_lua_bindIf the function definition is written in, it’s done. If you pursue the elegance of file organization, you should create a new. C file. However, if you do this, you will fall into the quagmire of compilation stage. Therefore, you should not pursue elegance first, but just create a new. C file AppDelegate.cpp At the end of the file, write the definition of the function

3. It’s done. You can do it now main.lua Use in documentstest_lua_bind()Function:

4. What about creating a new. C file? holdAppDelegate.cppIn the documenttest_lua_bindFunction definition code is deleted in the header#includeAdd the following:

stayframeworks/runtime-src/ClassesCreate in directorytest_lua_bind.hThe contents of the document are as follows:

Recreatetest_lua_bind.cFile, content unchanged:

Use thecocos compile -p macCommand compilation, you will findtest_lua_bind.cThe file is not compiled. Of course, ordinary C / C + + projects use makefile to specify which. C / CPP files to compile. Although the current cocos2d-x project does not have makefile files, it also follows this principle, that is, there must be a place to specify all the files to be compiled, which needs to be compiled in this placetest_lua_bind.cAdd it so that the entire project is compiled as part of the project.

The answer is that the cocos2d-x project does not use makefile. Instead, it cleverly uses the project files related to the specific environment as the command-line compilation environment. For example, Xcode project files are used when compiling IOS or Mac, and they are used when compiling AndroidAndroid.mkDocuments.

So, add ittest_lua_bind.handtest_lua_bind.cAfter the file, open the project with Xcode and add the two files to the project.

Note: do not check “copy items into destination group’s folder (if needed)” because the Xcode project directory organization of cocos2d-x is not a conventional structure. Once this is checked, the two files will be copied toframeworks/runtime-src/proj.ios_macThe originalframeworks/runtime-src/ClassesThe files under the directory will be scrapped. This organization will be disordered, and it will affect the reference of these two files on Android side.

holdtest_lua_bind.handtest_lua_bind.cppAfter these two files are added to the Xcode project, go to the command line to executecocos compile -p macThe compilation will be successful.

There are

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