cocos2d-x lua 屏幕适配问题(OpenGL调用)，版本号(cocos2dx v3.4)

概述前言 我们知道，cocos2dx 中屏幕适配的设置方法是 Director::getInstance()->getOpenGLView()->setDesignResolutionSize(960, 640, kResolutionShowAll); 为了保持我们的游戏不被拉伸，选择showAll方法。但是有一个问题，showAll会留黑边，那么我们只需要在openGL中渲染黑边即可。这样黑边就会 前言

我们知道，cocos2dx 中屏幕适配的设置方法是

Director::getInstance()->getopenGLVIEw()->setDesignResolutionSize(960,640,kResolutionShowAll);

为了保持我们的游戏不被拉伸，选择showAll方法。但是有一个问题，showAll会留黑边，那么我们只需要在openGL中渲染黑边即可。这样黑边就会被填充为我们自己设置的图片。话不多说，看看下面的代码。

MainScene.lua

调用示例如下，只需要在onEnter里面渲染即可

function MainScene:onEnter()    local function createSpriteWithPathPosScale(path,pos,scale)        -- body        local sprite = cc.Sprite:create(path)        sprite : setAnchorPoint(cc.p(0,0))        sprite : setposition(pos)        sprite : setScale(scale)        return sprite    end    local layer = cp.ScreenMatchLayer : create()    layer:retain()    local sprite = createSpriteWithPathPosScale("ui_img_left.jpg",cc.p(0 - 88,0),1)    layer : getChildByname("_node") : addChild(sprite)    sprite = createSpriteWithPathPosScale("ui_img_left.jpg",cc.p(960,-1)    layer : getChildByname("_node") : addChild(sprite)    sprite = createSpriteWithPathPosScale("ui_img_top.jpg",cc.p(480,640 + 32.5),1)    layer : getChildByname("_node") : addChild(sprite)    sprite = createSpriteWithPathPosScale("ui_img_top.jpg",-480-32.5),-1)    layer : getChildByname("_node") : addChild(sprite)end

AppDelegate.cpp

这里面对ScreenMatchLayer进行注册以便被lua调用

bool AppDelegate::applicationDIDFinishLaunching(){    // set default FPS    Director::getInstance()->setAnimationInterval(1.0 / 60.0f);       // register lua module    auto engine = LuaEngine::getInstance();    ScriptEngineManager::getInstance()->setScriptEngine(engine);    lua_State* L = engine->getLuaStack()->getLuaState();    lua_module_register(L);	ScreenMatchLayer::lua_bind_AllFunction(L);    // If you want to use Quick-Cocos2d-X,please uncomment below code    // register_all_quick_manual(L);    LuaStack* stack = engine->getLuaStack();    stack->setXXTEAKeyAndSign("2dxLua",strlen("2dxLua"),"XXTEA",strlen("XXTEA"));        //register custom function    //LuaStack* stack = engine->getLuaStack();    //register_custom_function(stack->getLuaState());    #if (COCOS2D_DEBUG > 0) && (CC_CODE_IDE_DEBUG_SUPPORT > 0)    // NOTE:Please don't remove this call if you want to deBUG with Cocos Code IDE    RuntimeEngine::getInstance()->start();    cocos2d::log("iShow!");#else    if (engine->executeScriptfile("src/main.lua"))    {        return false;    }#endif        return true;}

ScreenMatchLayer.h

#ifndef __SCREENMATCHLAYER_H__#define __SCREENMATCHLAYER_H__#include "cocos2d.h"namespace cocos2d{	class ScreenMatchLayer : public  Layer	{	public:		ScreenMatchLayer(voID);		~ScreenMatchLayer(voID);		static ScreenMatchLayer* create();		bool init();		voID visit(Renderer *renderer,const Mat4& parenttransform,uint32_t parentFlags);		voID onBeforeVisit();		voID onAfterVisit();		static int  lua_bind_AllFunction(lua_State* tolua_S);		static const std::string classprefix;		static const std::string fullname;		static const std::string classname;	private:		Node* _node;		CustomCommand _beforeVisit;		CustomCommand _afterVisit;	};}int lua_cocos2dx_ScreenMatchLayer_create(lua_State* tolua_S);#endif

ScreenMatchLayer.cpp

#include "ScreenMatchLayer.h"#include "tolua_fix.h"#include "LuaBasicConversions.h"using namespace cocos2d;const std::string ScreenMatchLayer::classprefix = "cp";const std::string ScreenMatchLayer::classname = "ScreenMatchLayer";const std::string ScreenMatchLayer::fullname = classprefix + "." + classname;ScreenMatchLayer::ScreenMatchLayer(voID){}ScreenMatchLayer::~ScreenMatchLayer(voID){}bool ScreenMatchLayer::init(){	if ( !Layer::init() ) {		return false;	}		_node = Node::create();	_node->setname("_node");	_node->setAnchorPoint(ccp(0,0));	addChild(_node);	GLVIEw* openGLVIEw = this->_director->getopenGLVIEw();	Size frameSize = openGLVIEw->getFrameSize();	Size designSize = Size(960,640); 	Size nodeSize = Size(0,0);	bool frameSizeWIDthLarger = (designSize.wIDth / designSize.height) < (frameSize.wIDth / frameSize.height );		if(frameSizeWIDthLarger)	{		nodeSize.height = designSize.height;		nodeSize.wIDth = nodeSize.height * (frameSize.wIDth / frameSize.height);	}	else	{		nodeSize.wIDth = designSize.wIDth;		nodeSize.height = nodeSize.wIDth * (frameSize.height / frameSize.wIDth);	} 	 _node->setposition(ccp((nodeSize.wIDth - designSize.wIDth) / 2,(nodeSize.height - designSize.height) / 2));	auto _afterDrawListener = EventListenerCustom::create(Director::EVENT_AFTER_VISIT,[this](EventCustom* event) {			this->visit(this->_director->getRenderer(),Mat4::IDENTITY,0);	});	auto eventdispatcher = Director::getInstance()->getEventdispatcher();	eventdispatcher->addEventListenerWithFixedPriority(_afterDrawListener,1);	return true;}voID ScreenMatchLayer::onBeforeVisit(){	GLVIEw* openGLVIEw = this->_director->getopenGLVIEw();	Size frameSize = openGLVIEw->getFrameSize();	glVIEwport((Glint)(0),(Glint)(0),(GLsizei)(frameSize.wIDth),(GLsizei)(frameSize.height));}voID ScreenMatchLayer::onAfterVisit(){	GLVIEw* openGLVIEw = this->_director->getopenGLVIEw();	Size designSize = openGLVIEw->getDesignResolutionSize();	openGLVIEw->setVIEwPortInPoints(0,designSize.wIDth,designSize.height);}voID ScreenMatchLayer::visit(Renderer *renderer,uint32_t parentFlags){	if(!_visible)        return;    _beforeVisit.init(_globalZOrder);    _beforeVisit.func = CC_CALLBACK_0(ScreenMatchLayer::onBeforeVisit,this);    renderer->addCommand(&_beforeVisit);	Node::visit(renderer,parenttransform,parentFlags);        _afterVisit.init(_globalZOrder);    _afterVisit.func = CC_CALLBACK_0(ScreenMatchLayer::onAfterVisit,this);    renderer->addCommand(&_afterVisit);}ScreenMatchLayer * ScreenMatchLayer::create(){	ScreenMatchLayer *pRet = new ScreenMatchLayer();	if ( pRet && pRet->init() ) {        pRet->autorelease();        return pRet;    }    CC_SAFE_DELETE(pRet);    return nullptr;}int ScreenMatchLayer::lua_bind_AllFunction(lua_State* tolua_S){		lua_getglobal(tolua_S,"_G");		if (lua_istable(tolua_S,-1))//stack:...,_G,{			tolua_open(tolua_S);					tolua_module(tolua_S,classprefix.c_str(),0);			tolua_beginmodule(tolua_S,classprefix.c_str());			tolua_usertype(tolua_S,ScreenMatchLayer::fullname.c_str());			tolua_cclass(tolua_S,classname.c_str(),ScreenMatchLayer::fullname.c_str(),"cc.Layer",nullptr);			tolua_beginmodule(tolua_S,classname.c_str());				tolua_function(tolua_S,"create",lua_cocos2dx_ScreenMatchLayer_create);			tolua_endmodule(tolua_S);			g_luaType[typeID(ScreenMatchLayer).name()] = ScreenMatchLayer::fullname;			g_typeCast[classname] = ScreenMatchLayer::fullname;						tolua_endmodule(tolua_S);		}		lua_pop(tolua_S,1);	return 1;}int lua_cocos2dx_ScreenMatchLayer_create(lua_State* tolua_S){    int argc = 0;	ScreenMatchLayer* parentOfFunction = nullptr;	const std::string &functionString = "'lua_cocos2dx_ScreenMatchLayer_create'";	const std::string &luaFunctionString = ScreenMatchLayer::fullname + ":create";#if COCOS2D_DEBUG >= 1	tolua_Error tolua_err;	if (!tolua_isusertable(tolua_S,1,&tolua_err))	{		  tolua_error(tolua_S,("#ferror in function " + functionString).c_str(),&tolua_err);		  return 0;	}	parentOfFunction = (ScreenMatchLayer*)tolua_tousertype(tolua_S,0);	 if (!parentOfFunction)     {		//tolua_error(tolua_S,("invalID 'cobj' in function " + functionString).c_str(),nullptr);        //return 0;    }#endif    argc = lua_gettop(tolua_S) - 1;    if (argc == 0)    {		ScreenMatchLayer* ret = ScreenMatchLayer::create();        object_to_luaval<ScreenMatchLayer>(tolua_S,(ScreenMatchLayer*)ret);        return 1;    }    else 		{luaL_error(tolua_S,"%s has wrong number of arguments: %d,was expecting %d \n",luaFunctionString.c_str(),argc,1);}    return 0;}

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