第一次發(fā)送超過字?jǐn)?shù)了，被迫剪成兩篇！

上一篇我們介紹了如何搭建開發(fā)環(huán)境，并創(chuàng)建了一個空白的窗口程序。
這里我們主要是實現(xiàn)在程序中裝載一個簡單的模型并顯示出來。
首先看一下效果吧，（模型就是ogre例子中的robot.mesh）,如下：

例子很簡單，代碼頁不多，就4行。我們還是一步一步來分析吧。
首先我們上一個項目中的OgreDemo1類繼承自ExampleApplication類，我們之所以什么都沒

有做就能創(chuàng)建一個窗口，就是因為ExampleApplication為我們實現(xiàn)了。
首先我們打開ExampleApplication類，可以看到包含了如下幾個成員變量（加入了少許注釋）

//ogre的程序"根"任何ogre程序都會有改對象??? ?

Root?*mRoot;??? ?

//攝像機(jī)鏡頭??? ?

Camera*?mCamera;??? ?

//場景管理器??? ?

SceneManager*?mSceneMgr;??? ?

//對于每一幀進(jìn)行處理的類??? ?

ExampleFrameListener*?mFrameListener;??? ?

//渲染窗口??? ?

RenderWindow*?mWindow;??? ?

//資源文件的路徑字符串??? ?

Ogre::String?mResourcePath;??

這里的ExampleFrameListener類，如果你暫時還不清楚是做什么的，不要緊，后面我們慢慢介紹。
知道了這些成員變量，我們在返回OgreDemo1.c文件中看看入口函數(shù)WinMain中是如何書寫的呢？很簡單就一句話：

app.go();?

先將源代碼貼出來，加了詳細(xì)注意：
ExampleApplication.h

#ifndef?__ExampleApplication_H__??? ?

#define?__ExampleApplication_H__??? ?

?? ?

#include?"Ogre.h"??? ?

#include?"OgreConfigFile.h"??? ?

#include?"ExampleFrameListener.h"??? ?

?? ?

#if?OGRE_PLATFORM?==?OGRE_PLATFORM_APPLE??? ?

#include?<CoreFoundation/CoreFoundation.h>??? ?

?? ?

std::string?macBundlePath()??? ?

{??? ?

????char?path[1024];??? ?

????CFBundleRef?mainBundle?=?CFBundleGetMainBundle();??? ?

????assert(mainBundle);??? ?

?? ?

????CFURLRef?mainBundleURL?=?CFBundleCopyBundleURL(mainBundle);??? ?

????assert(mainBundleURL);??? ?

?? ?

????CFStringRef?cfStringRef?=?CFURLCopyFileSystemPath(?mainBundleURL,?kCFURLPOSIXPathStyle);??? ?

????assert(cfStringRef);??? ?

?? ?

????CFStringGetCString(cfStringRef,?path,?1024,?kCFStringEncodingASCII);??? ?

?? ?

????CFRelease(mainBundleURL);??? ?

????CFRelease(cfStringRef);??? ?

?? ?

????return?std::string(path);??? ?

}??? ?

#endif??? ?

?? ?

using?namespace?Ogre;??? ?

?? ?

/**?Base?class?which?manages?the?standard?startup?of?an?Ogre?application.?? ?

????Designed?to?be?subclassed?for?specific?examples?if?required.?? ?

*/?? ?

class?ExampleApplication??? ?

{??? ?

public:??? ?

????ExampleApplication()??? ?

????{??? ?

????????mFrameListener?=?0;??? ?

????????mRoot?=?0;??? ?

#if?OGRE_PLATFORM?==?OGRE_PLATFORM_APPLE??? ?

????????mResourcePath?=?macBundlePath()?+?"/Contents/Resources/";??? ?

#else??? ?

????????mResourcePath?=?"";??? ?

#endif??? ?

????}??? ?

????///?Standard?destructor??? ?

????virtual?~ExampleApplication()??? ?

????{??? ?

????????if?(mFrameListener)??? ?

????????????delete?mFrameListener;??? ?

????????if?(mRoot)??? ?

????????????OGRE_DELETE?mRoot;??? ?

????}??? ?

?? ?

????///?程序的入口??? ?

????virtual?void?go(void)??? ?

????{??? ?

????????//進(jìn)行初始化工作??? ?

????????if?(!setup())??? ?

????????????return;??? ?

????????//開始渲染??? ?

????????mRoot->startRendering();??? ?

????????//?清理屏幕??? ?

????????destroyScene();??? ?

????}??? ?

?? ?

protected:??? ?

????//ogre的程序"根"任何ogre程序都會有改對象??? ?

????Root?*mRoot;??? ?

????//攝像機(jī)鏡頭??? ?

????Camera*?mCamera;??? ?

????//場景管理器??? ?

????SceneManager*?mSceneMgr;??? ?

????//對于每一幀進(jìn)行處理的類??? ?

????ExampleFrameListener*?mFrameListener;??? ?

????//渲染窗口??? ?

????RenderWindow*?mWindow;??? ?

????//資源文件的路徑字符串??? ?

????Ogre::String?mResourcePath;??? ?

????//初始化應(yīng)用程序??? ?

????virtual?bool?setup(void)??? ?

????{??? ?

????????String?pluginsPath;??? ?

#ifndef?OGRE_STATIC_LIB??? ?

????????pluginsPath?=?mResourcePath?+?"plugins.cfg";??? ?

#endif??? ?

????????//構(gòu)建Root對象??? ?

????????mRoot?=?OGRE_NEW?Root(pluginsPath,???? ?

????????????mResourcePath?+?"ogre.cfg",?mResourcePath?+?"Ogre.log");??? ?

????????//配置資源文件相關(guān)??? ?

????????setupResources();??? ?

????????//配置，主要用于初始化渲染窗口??? ?

????????bool?carryOn?=?configure();??? ?

????????if?(!carryOn)?return?false;??? ?

????????//創(chuàng)建場景管理器??? ?

????????chooseSceneManager();??? ?

????????//創(chuàng)建攝像機(jī)??? ?

????????createCamera();??? ?

????????//創(chuàng)建視口??? ?

????????createViewports();??? ?

??????????? ?

????????TextureManager::getSingleton().setDefaultNumMipmaps(5);??? ?

????????//創(chuàng)建資源監(jiān)聽??? ?

????????createResourceListener();??? ?

????????//床在資源??? ?

????????loadResources();??? ?

????????//創(chuàng)建屏幕，必須重寫，也就是我們OgreDemo1類中（我們現(xiàn)實模型需要實現(xiàn)的）??? ?

????????createScene();??? ?

????????//創(chuàng)建幀監(jiān)聽??? ?

????????createFrameListener();??? ?

????????return?true;??? ?

????}??? ?

????/**?是否配置完成，完成則初始化系統(tǒng)?*/?? ?

????virtual?bool?configure(void)??? ?

????{??? ?

????????//判斷是否進(jìn)入（即運行過了配置窗口，進(jìn)入demo窗口）??? ?

????????if(mRoot->showConfigDialog())??? ?

????????{??? ?

????????????//初始化系統(tǒng),得到一個渲染窗口對象??? ?

????????????mWindow?=?mRoot->initialise(true);??? ?

????????????return?true;??? ?

????????}??? ?

????????else?? ?

????????{??? ?

????????????return?false;??? ?

????????}??? ?

????}??? ?

?? ?

????virtual?void?chooseSceneManager(void)??? ?

????{??? ?

????????//?創(chuàng)建一個場景管理器(場景類型,窗口標(biāo)題)??? ?

????????mSceneMgr?=?mRoot->createSceneManager(ST_GENERIC,?"ExampleSMInstance");??? ?

????}??? ?

????virtual?void?createCamera(void)??? ?

????{??? ?

????????//?創(chuàng)建一個攝像機(jī)??? ?

????????mCamera?=?mSceneMgr->createCamera("PlayerCam");??? ?

?? ?

????????//?設(shè)置攝像機(jī)的位置??? ?

????????mCamera->setPosition(Vector3(0,0,500));??? ?

????????//?設(shè)置觀察點??? ?

????????mCamera->lookAt(Vector3(0,0,-300));??? ?

????????//?設(shè)置最近裁剪距離，如果超出則不顯示??? ?

????????mCamera->setNearClipDistance(5);??? ?

????????//同樣還有設(shè)置最遠(yuǎn)裁剪距離??? ?

????????//mCamera->setFarClipDistance(1000);??? ?

????}??? ?

????//創(chuàng)建幀監(jiān)聽??? ?

????virtual?void?createFrameListener(void)??? ?

????{??? ?

????????//實例化幀監(jiān)聽，(渲染窗口，攝像機(jī))??? ?

????????mFrameListener=?new?ExampleFrameListener(mWindow,?mCamera);??? ?

????????//設(shè)置是否顯示調(diào)試信息(比如：fps...)??? ?

????????mFrameListener->showDebugOverlay(true);??? ?

????????//添加幀監(jiān)聽到root中??? ?

????????mRoot->addFrameListener(mFrameListener);??? ?

????}??? ?

????//創(chuàng)建屏幕??? ?

????virtual?void?createScene(void)?=?0;???? ?

????//清屏??? ?

????virtual?void?destroyScene(void){}??? ?

????/*?創(chuàng)建視口并初始化?*/?? ?

????virtual?void?createViewports(void)??? ?

????{??? ?

????????//?創(chuàng)建一個“視口”??? ?

????????Viewport*?vp?=?mWindow->addViewport(mCamera);??? ?

????????//設(shè)置背景顏色??? ?

????????vp->setBackgroundColour(ColourValue(0,0,0));??? ?

?? ?

????????//設(shè)置屏幕的長寬比（視口的寬度和高度比，目前的寬屏電腦）??? ?

????????mCamera->setAspectRatio(Real(vp->getActualWidth())?/?Real(vp->getActualHeight()));??? ?

????}??? ?

?? ?

????///?初始化資源，比如：模型、貼圖等資源??? ?

????virtual?void?setupResources(void)??? ?

????{??? ?

????????ConfigFile?cf;??? ?

????????//讀取配置文件??? ?

????????cf.load(mResourcePath?+?"resources.cfg");??? ?

????????ConfigFile::SectionIterator?seci?=?cf.getSectionIterator();??? ?

????????String?secName,?typeName,?archName;??? ?

????????while?(seci.hasMoreElements())??? ?

????????{??? ?

????????????secName?=?seci.peekNextKey();??? ?

????????????ConfigFile::SettingsMultiMap?*settings?=?seci.getNext();??? ?

????????????ConfigFile::SettingsMultiMap::iterator?i;??? ?

????????????for?(i?=?settings->begin();?i?!=?settings->end();?++i)??? ?

????????????{??? ?

????????????????//取得并添加資源文件??? ?

????????????????typeName?=?i->first;??? ?

????????????????archName?=?i->second;??? ?

#if?OGRE_PLATFORM?==?OGRE_PLATFORM_APPLE??? ?

????????????????ResourceGroupManager::getSingleton().addResourceLocation(??? ?

????????????????????String(macBundlePath()?+?"/"?+?archName),?typeName,?secName);??? ?

#else??? ?

????????????????ResourceGroupManager::getSingleton().addResourceLocation(??? ?

????????????????????archName,?typeName,?secName);??? ?

#endif??? ?

????????????}??? ?

????????}??? ?

????}??? ?

?? ?

????//創(chuàng)建資源監(jiān)聽，比如（正在裝載資源，請稍等界面）??? ?

????virtual?void?createResourceListener(void)??? ?

????{??? ?

????}??? ?

?? ?

????//裝載資源??? ?

????virtual?void?loadResources(void)??? ?

????{??? ?

????????ResourceGroupManager::getSingleton().initialiseAllResourceGroups();??? ?

????}??? ?

};??? ?

?? ?

?? ?

#endif??

ExampleFrameListener.h

#ifndef?__ExampleFrameListener_H__??? ?

#define?__ExampleFrameListener_H__??? ?

?? ?

#include?"Ogre.h"??? ?

#include?"OgreStringConverter.h"??? ?

#include?"OgreException.h"??? ?

#define?OIS_DYNAMIC_LIB??? ?

#include?<OIS/OIS.h>??? ?

?? ?

using?namespace?Ogre;??? ?

?? ?

class?ExampleFrameListener:?public?FrameListener,?public?WindowEventListener??? ?

{??? ?

protected:??? ?

????virtual?void?updateStats(void)??? ?

????{??? ?

????????static?String?currFps?=?"Current?FPS:?";??? ?

????????static?String?avgFps?=?"Average?FPS:?";??? ?

????????static?String?bestFps?=?"Best?FPS:?";??? ?

????????static?String?worstFps?=?"Worst?FPS:?";??? ?

????????static?String?tris?=?"Triangle?Count:?";??? ?

????????static?String?batches?=?"Batch?Count:?";??? ?

?? ?

????????//?需要更新debug信息時更新??? ?

????????try?{??? ?

????????????OverlayElement*?guiAvg?=?OverlayManager::getSingleton().getOverlayElement("Core/AverageFps");??? ?

????????????OverlayElement*?guiCurr?=?OverlayManager::getSingleton().getOverlayElement("Core/CurrFps");??? ?

????????????OverlayElement*?guiBest?=?OverlayManager::getSingleton().getOverlayElement("Core/BestFps");??? ?

????????????OverlayElement*?guiWorst?=?OverlayManager::getSingleton().getOverlayElement("Core/WorstFps");??? ?

?? ?

????????????const?RenderTarget::FrameStats&?stats?=?mWindow->getStatistics();??? ?

????????????guiAvg->setCaption(avgFps?+?StringConverter::toString(stats.avgFPS));??? ?

????????????guiCurr->setCaption(currFps?+?StringConverter::toString(stats.lastFPS));??? ?

????????????guiBest->setCaption(bestFps?+?StringConverter::toString(stats.bestFPS)??? ?

????????????????+"?"+StringConverter::toString(stats.bestFrameTime)+"?ms");??? ?

????????????guiWorst->setCaption(worstFps?+?StringConverter::toString(stats.worstFPS)??? ?

????????????????+"?"+StringConverter::toString(stats.worstFrameTime)+"?ms");??? ?

?? ?

????????????OverlayElement*?guiTris?=?OverlayManager::getSingleton().getOverlayElement("Core/NumTris");??? ?

????????????guiTris->setCaption(tris?+?StringConverter::toString(stats.triangleCount));??? ?

?? ?

????????????OverlayElement*?guiBatches?=?OverlayManager::getSingleton().getOverlayElement("Core/NumBatches");??? ?

????????????guiBatches->setCaption(batches?+?StringConverter::toString(stats.batchCount));??? ?

?? ?

????????????OverlayElement*?guiDbg?=?OverlayManager::getSingleton().getOverlayElement("Core/DebugText");??? ?

????????????guiDbg->setCaption(mDebugText);??? ?

????????}??? ?

????????catch(...)?{?/*?ignore?*/?}??? ?

????}??? ?

?? ?

public:??? ?

????//?構(gòu)造函數(shù),初始化成員變量??? ?

????ExampleFrameListener(RenderWindow*?win,?Camera*?cam,?bool?bufferedKeys?=?false,?bool?bufferedMouse?=?false,??? ?

?????????????????bool?bufferedJoy?=?false?)?:??? ?

????????mCamera(cam),?mTranslateVector(Vector3::ZERO),?mCurrentSpeed(0),?mWindow(win),?mStatsOn(true),?mNumScreenShots(0),??? ?

????????mMoveScale(0.0f),?mRotScale(0.0f),?mTimeUntilNextToggle(0),?mFiltering(TFO_BILINEAR),??? ?

????????mAniso(1),?mSceneDetailIndex(0),?mMoveSpeed(100),?mRotateSpeed(36),?mDebugOverlay(0),??? ?

????????mInputManager(0),?mMouse(0),?mKeyboard(0),?mJoy(0)??? ?

????{??? ?

????????//得到debug視圖??? ?

????????mDebugOverlay?=?OverlayManager::getSingleton().getByName("Core/DebugOverlay");??? ?

????????//日志管理器??? ?

????????LogManager::getSingletonPtr()->logMessage("***?Initializing?OIS?***");??? ?

????????OIS::ParamList?pl;??? ?

????????size_t?windowHnd?=?0;??? ?

????????std::ostringstream?windowHndStr;??? ?

????????//取得自定義的屬性??? ?

????????win->getCustomAttribute("WINDOW",?&windowHnd);??? ?

????????windowHndStr?<<?windowHnd;??? ?

????????pl.insert(std::make_pair(std::string("WINDOW"),?windowHndStr.str()));??? ?

????????//創(chuàng)建輸入管理器??? ?

????????mInputManager?=?OIS::InputManager::createInputSystem(?pl?);??? ?

?? ?

????????//創(chuàng)建輸入設(shè)備、鼠標(biāo)、鍵盤、搖桿??? ?

????????mKeyboard?=?static_cast<OIS::Keyboard*>(mInputManager->createInputObject(?OIS::OISKeyboard,?bufferedKeys?));??? ?

????????mMouse?=?static_cast<OIS::Mouse*>(mInputManager->createInputObject(?OIS::OISMouse,?bufferedMouse?));??? ?

????????try?{??? ?

????????????mJoy?=?static_cast<OIS::JoyStick*>(mInputManager->createInputObject(?OIS::OISJoyStick,?bufferedJoy?));??? ?

????????}??? ?

????????catch(...)?{??? ?

????????????mJoy?=?0;??? ?

????????}??? ?

?? ?

????????//根據(jù)窗口的大小來設(shè)置鼠標(biāo)的初始裁剪區(qū)域??? ?

????????windowResized(mWindow);??? ?

????????//顯示debug信息??? ?

????????showDebugOverlay(true);??? ?

?? ?

????????//注冊一個windows窗口事件監(jiān)聽??? ?

????????WindowEventUtilities::addWindowEventListener(mWindow,?this);??? ?

????}??? ?

?? ?

????//調(diào)整鼠標(biāo)裁剪區(qū)域??? ?

????virtual?void?windowResized(RenderWindow*?rw)??? ?

????{??? ?

????????unsigned?int?width,?height,?depth;??? ?

????????int?left,?top;??? ?

????????//取得窗口矩陣??? ?

????????rw->getMetrics(width,?height,?depth,?left,?top);??? ?

????????//得到鼠標(biāo)??? ?

????????const?OIS::MouseState?&ms?=?mMouse->getMouseState();??? ?

????????ms.width?=?width;??? ?

????????ms.height?=?height;??? ?

????}??? ?

?? ?

????//關(guān)閉窗口之前進(jìn)行的處理??? ?

????virtual?void?windowClosed(RenderWindow*?rw)??? ?

????{??? ?

????????//檢測是否關(guān)閉了我們的渲染窗口??? ?

????????if(?rw?==?mWindow?)??? ?

????????{??? ?

????????????if(?mInputManager?)??? ?

????????????{??? ?

????????????????//清除輸入設(shè)備??? ?

????????????????mInputManager->destroyInputObject(?mMouse?);??? ?

????????????????mInputManager->destroyInputObject(?mKeyboard?);??? ?

????????????????mInputManager->destroyInputObject(?mJoy?);??? ?

????????????????//銷毀輸入管理器??? ?

????????????????OIS::InputManager::destroyInputSystem(mInputManager);??? ?

????????????????mInputManager?=?0;??? ?

????????????}??? ?

????????}??? ?

????}??? ?

?? ?

????virtual?~ExampleFrameListener()??? ?

????{??? ?

????????//移除所有的窗口事件監(jiān)聽??? ?

????????WindowEventUtilities::removeWindowEventListener(mWindow,?this);??? ?

????????//關(guān)閉窗口??? ?

????????windowClosed(mWindow);??? ?

????}??? ?

????//按鍵事件處理??? ?

????virtual?bool?processUnbufferedKeyInput(const?FrameEvent&?evt)??? ?

????{??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_A))??? ?

????????????mTranslateVector.x?=?-mMoveScale;???//?向左移動攝像頭矩陣??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_D))??? ?

????????????mTranslateVector.x?=?mMoveScale;????//?Move?camera?RIGHT??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_UP)?||?mKeyboard->isKeyDown(OIS::KC_W)?)??? ?

????????????mTranslateVector.z?=?-mMoveScale;???//?Move?camera?forward??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_DOWN)?||?mKeyboard->isKeyDown(OIS::KC_S)?)??? ?

????????????mTranslateVector.z?=?mMoveScale;????//?Move?camera?backward??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_PGUP))??? ?

????????????mTranslateVector.y?=?mMoveScale;????//?Move?camera?up??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_PGDOWN))??? ?

????????????mTranslateVector.y?=?-mMoveScale;???//?Move?camera?down??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_RIGHT))??? ?

????????????mCamera->yaw(-mRotScale);??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_LEFT))??? ?

????????????mCamera->yaw(mRotScale);??? ?

?? ?

????????if(?mKeyboard->isKeyDown(OIS::KC_ESCAPE)?||?mKeyboard->isKeyDown(OIS::KC_Q)?)??? ?

????????????return?false;??? ?

?? ?

????????if(?mKeyboard->isKeyDown(OIS::KC_F)?&&?mTimeUntilNextToggle?<=?0?)??? ?

????????{??? ?

????????????mStatsOn?=?!mStatsOn;??? ?

????????????showDebugOverlay(mStatsOn);??? ?

????????????mTimeUntilNextToggle?=?1;??? ?

????????}??? ?

?? ?

????????if(?mKeyboard->isKeyDown(OIS::KC_T)?&&?mTimeUntilNextToggle?<=?0?)??? ?

????????{??? ?

????????????switch(mFiltering)??? ?

????????????{??? ?

????????????case?TFO_BILINEAR:??? ?

????????????????mFiltering?=?TFO_TRILINEAR;??? ?

????????????????mAniso?=?1;??? ?

????????????????break;??? ?

????????????case?TFO_TRILINEAR:??? ?

????????????????mFiltering?=?TFO_ANISOTROPIC;??? ?

????????????????mAniso?=?8;??? ?

????????????????break;??? ?

????????????case?TFO_ANISOTROPIC:??? ?

????????????????mFiltering?=?TFO_BILINEAR;??? ?

????????????????mAniso?=?1;??? ?

????????????????break;??? ?

????????????default:?break;??? ?

????????????}??? ?

????????????MaterialManager::getSingleton().setDefaultTextureFiltering(mFiltering);??? ?

????????????MaterialManager::getSingleton().setDefaultAnisotropy(mAniso);??? ?

?? ?

????????????showDebugOverlay(mStatsOn);??? ?

????????????mTimeUntilNextToggle?=?1;??? ?

????????}??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_SYSRQ)?&&?mTimeUntilNextToggle?<=?0)??? ?

????????{??? ?

????????????std::ostringstream?ss;??? ?

????????????ss?<<?"screenshot_"?<<?++mNumScreenShots?<<?".png";??? ?

????????????mWindow->writeContentsToFile(ss.str());??? ?

????????????mTimeUntilNextToggle?=?0.5;??? ?

????????????mDebugText?=?"Saved:?"?+?ss.str();??? ?

????????}??? ?

?? ?

????????if(mKeyboard->isKeyDown(OIS::KC_R)?&&?mTimeUntilNextToggle?<=0)??? ?

????????{??? ?

????????????mSceneDetailIndex?=?(mSceneDetailIndex+1)%3?;??? ?

????????????switch(mSceneDetailIndex)?{??? ?

????????????????case?0?:?mCamera->setPolygonMode(PM_SOLID);?break;//設(shè)置多邊形的模式??? ?

????????????????case?1?:?mCamera->setPolygonMode(PM_WIREFRAME);?break;??? ?

????????????????case?2?:?mCamera->setPolygonMode(PM_POINTS);?break;??? ?

????????????}??? ?

????????????mTimeUntilNextToggle?=?0.5;??? ?

????????}??? ?

?? ?

????????static?bool?displayCameraDetails?=?false;??? ?

????????if(mKeyboard->isKeyDown(OIS::KC_P)?&&?mTimeUntilNextToggle?<=?0)??? ?

????????{??? ?

????????????displayCameraDetails?=?!displayCameraDetails;??? ?

????????????mTimeUntilNextToggle?=?0.5;??? ?

????????????if?(!displayCameraDetails)??? ?

????????????????mDebugText?=?"";??? ?

????????}??? ?

?? ?

????????if(displayCameraDetails)??? ?

????????????mDebugText?=?"P:?"?+?StringConverter::toString(mCamera->getDerivedPosition())?+??? ?

?????????????????????????"?"?+?"O:?"?+?StringConverter::toString(mCamera->getDerivedOrientation());??? ?

????????return?true;??? ?

????}??? ?

????//鼠標(biāo)事件處理??? ?

????virtual?bool?processUnbufferedMouseInput(const?FrameEvent&?evt)??? ?

????{??? ?

?? ?

????????//?Rotation?factors,?may?not?be?used?if?the?second?mouse?button?is?pressed??? ?

????????//?2nd?mouse?button?-?slide,?otherwise?rotate??? ?

????????const?OIS::MouseState?&ms?=?mMouse->getMouseState();??? ?

????????if(?ms.buttonDown(?OIS::MB_Right?)?)??? ?

????????{??? ?

????????????mTranslateVector.x?+=?ms.X.rel?*?0.13;??? ?

????????????mTranslateVector.y?-=?ms.Y.rel?*?0.13;??? ?

????????}??? ?

????????else?? ?

????????{??? ?

????????????mRotX?=?Degree(-ms.X.rel?*?0.13);??? ?

????????????mRotY?=?Degree(-ms.Y.rel?*?0.13);??? ?

????????}??? ?

?? ?

????????return?true;??? ?

????}??? ?

?? ?

????//移動攝像頭??? ?

????virtual?void?moveCamera()??? ?

????{??? ?

????????//偏移??? ?

????????mCamera->yaw(mRotX);??? ?

????????//傾斜??? ?

????????mCamera->pitch(mRotY);??? ?

????????//移動攝像機(jī)到指定位置??? ?

????????mCamera->moveRelative(mTranslateVector);??? ?

????}??? ?

????//顯示debug信息??? ?

????virtual?void?showDebugOverlay(bool?show)??? ?

????{??? ?

????????if?(mDebugOverlay)??? ?

????????{??? ?

????????????if?(show)??? ?

????????????????mDebugOverlay->show();??? ?

????????????else?? ?

????????????????mDebugOverlay->hide();??? ?

????????}??? ?

????}??? ?

?? ?

????//?渲染隊列??? ?

????bool?frameRenderingQueued(const?FrameEvent&?evt)??? ?

????{??? ?

?? ?

????????if(mWindow->isClosed())??return?false;??? ?

?? ?

????????mSpeedLimit?=?mMoveScale?*?evt.timeSinceLastFrame;??? ?

?? ?

????????//捕獲、更新設(shè)備??? ?

????????mKeyboard->capture();??? ?

????????mMouse->capture();??? ?

????????if(?mJoy?)?mJoy->capture();??? ?

?? ?

????????bool?buffJ?=?(mJoy)???mJoy->buffered()?:?true;??? ?

?? ?

????????Ogre::Vector3?lastMotion?=?mTranslateVector;??? ?

????????if(?!mMouse->buffered()?||?!mKeyboard->buffered()?||?!buffJ?)??? ?

????????{??? ?

????????????//?one?of?the?input?modes?is?immediate,?so?setup?what?is?needed?for?immediate?movement??? ?

????????????if?(mTimeUntilNextToggle?>=?0)??? ?

????????????????mTimeUntilNextToggle?-=?evt.timeSinceLastFrame;??? ?

?? ?

????????????//?Move?about?100?units?per?second??? ?

????????????mMoveScale?=?mMoveSpeed?*?evt.timeSinceLastFrame;??? ?

????????????//?Take?about?10?seconds?for?full?rotation??? ?

????????????mRotScale?=?mRotateSpeed?*?evt.timeSinceLastFrame;??? ?

?? ?

????????????mRotX?=?0;??? ?

????????????mRotY?=?0;??? ?

????????????mTranslateVector?=?Ogre::Vector3::ZERO;??? ?

?? ?

????????}??? ?

?? ?

????????//Check?to?see?which?device?is?not?buffered,?and?handle?it??? ?

????????if(?!mKeyboard->buffered()?)??? ?

????????????if(?processUnbufferedKeyInput(evt)?==?false?)??? ?

????????????????return?false;??? ?

????????if(?!mMouse->buffered()?)??? ?

????????????if(?processUnbufferedMouseInput(evt)?==?false?)??? ?

????????????????return?false;??? ?

?? ?

????????//?ramp?up?/?ramp?down?speed??? ?

????????if?(mTranslateVector?==?Ogre::Vector3::ZERO)??? ?

????????{??? ?

????????????//?decay?(one?third?speed)??? ?

????????????mCurrentSpeed?-=?evt.timeSinceLastFrame?*?0.3;??? ?

????????????mTranslateVector?=?lastMotion;??? ?

????????}??? ?

????????else?? ?

????????{??? ?

????????????//?ramp?up??? ?

????????????mCurrentSpeed?+=?evt.timeSinceLastFrame;??? ?

?? ?

????????}??? ?

????????//?Limit?motion?speed??? ?

????????if?(mCurrentSpeed?>?1.0)??? ?

????????????mCurrentSpeed?=?1.0;??? ?

????????if?(mCurrentSpeed?<?0.0)??? ?

????????????mCurrentSpeed?=?0.0;??? ?

?? ?

????????mTranslateVector?*=?mCurrentSpeed;??? ?

?? ?

?? ?

????????if(?!mMouse->buffered()?||?!mKeyboard->buffered()?||?!buffJ?)??? ?

????????????moveCamera();??? ?

?? ?

????????return?true;??? ?

????}??? ?

?? ?

????//幀結(jié)束,更新狀態(tài)??? ?

????bool?frameEnded(const?FrameEvent&?evt)??? ?

????{??? ?

????????updateStats();??? ?

????????return?true;??? ?

????}??? ?

?? ?

protected:??? ?

????//指向攝像機(jī)的指針??? ?

????Camera*?mCamera;??? ?

????//一個3維向量，用于攝像機(jī)的位置變換??? ?

????Vector3?mTranslateVector;??? ?

????Real?mCurrentSpeed;??? ?

????//指向渲染窗口的指針??? ?

????RenderWindow*?mWindow;??? ?

????//是否顯示調(diào)試信息??? ?

????bool?mStatsOn;??? ?

????//debug信息??? ?

????std::string?mDebugText;??? ?

????//主要用于截圖??? ?

????unsigned?int?mNumScreenShots;??? ?

????//該demo中，攝像機(jī)會旋轉(zhuǎn)??? ?

????float?mMoveScale;??? ?

????//速度限制??? ?

????float?mSpeedLimit;??? ?

????//同樣用于攝像機(jī)變換??? ?

????Degree?mRotScale;??? ?

????//延時??? ?

????Real?mTimeUntilNextToggle?;??? ?

????//鼠標(biāo)旋轉(zhuǎn)的角度，用于攝像機(jī)的更新??? ?

????Radian?mRotX,?mRotY;??? ?

????//紋理差值的類型，枚舉類型??? ?

????TextureFilterOptions?mFiltering;??? ?

????int?mAniso;??? ?

????int?mSceneDetailIndex?;??? ?

????//移動速度??? ?

????Real?mMoveSpeed;??? ?

????//旋轉(zhuǎn)速度??? ?

????Degree?mRotateSpeed;??? ?

????//debug視圖??? ?

????Overlay*?mDebugOverlay;??? ?

?? ?

????//一些輸入設(shè)備（輸入設(shè)備管理器）??? ?

????OIS::InputManager*?mInputManager;??? ?

????//鼠標(biāo)??? ?

????OIS::Mouse*????mMouse;??? ?

????//鍵盤??? ?

????OIS::Keyboard*?mKeyboard;??? ?

????//搖桿??? ?

????OIS::JoyStick*?mJoy;??? ?

};??? ?

?? ?

#endif??

接續(xù)（二）

轉(zhuǎn)載于:https://blog.51cto.com/yarin/382498

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