Irrlicht例002--Quake3Map

这个例子仅简单的介绍了下如何Load一个Quake3的场景，其中没有什么特殊的概念。
只需注意一下Irr的思想就可以，将场景和摄象机都做为场景节点来处理。

最后，提供了用户选择设备类型的功能，并显示了FPS。

/* Example 002 Quake3Map

This Tutorial shows how to load a Quake 3 map into the engine, create a

SceneNode for optimizing the speed of rendering, and how to create a user

controlled camera.

Please note that you should know the basics of the engine before starting this

tutorial. Just take a short look at the first tutorial, if you haven't done

this yet: http://irrlicht.sourceforge.net/tut001.html

Lets start like the HelloWorld example: We include the irrlicht header files

and an additional file to be able to ask the user for a driver type using the

console.

*/

#include <irrlicht.h>

#include <iostream>

/*

As already written in the HelloWorld example, in the Irrlicht Engine everything

can be found in the namespace 'irr'. To get rid of the irr:: in front of the

name of every class, we tell the compiler that we use that namespace from now

on, and we will not have to write that 'irr::'. There are 5 other sub

namespaces 'core', 'scene', 'video', 'io' and 'gui'. Unlike in the HelloWorld

example, we do not call 'using namespace' for these 5 other namespaces, because

in this way you will see what can be found in which namespace. But if you like,

you can also include the namespaces like in the previous example.

*/

using namespace irr;

/*

Again, to be able to use the Irrlicht.DLL file, we need to link with the

Irrlicht.lib. We could set this option in the project settings, but to make it

easy, we use a pragma comment lib:

*/

#ifdef _MSC_VER

#pragma comment(lib, "Irrlicht.lib")

#endif

/*

Ok, lets start. Again, we use the main() method as start, not the WinMain().

*/

int main()

/*

   Like in the HelloWorld example, we create an IrrlichtDevice with

   createDevice(). The difference now is that we ask the user to select

   which video driver to use. The Software device might be

   too slow to draw a huge Quake 3 map, but just for the fun of it, we make

   this decision possible, too.

   Instead of copying this whole code into your app, you can simply include

   driverChoice.h from Irrlicht's include directory. The function

   driverChoiceConsole does exactly the same.

*/

   // ask user for driver

   video::E_DRIVER_TYPE driverType;

   printf("Please select the driver you want for this example:\n"\

       " (a) OpenGL 1.5\n (b) Direct3D 9.0c\n (c) Direct3D 8.1\n"\

       " (d) Burning's Software Renderer\n (e) Software Renderer\n"\

       " (f) NullDevice\n (otherKey) exit\n\n");

   char i;

   std::cin >> i;

   switch(i)

       case 'a': driverType = video::EDT_OPENGL;   break;

       case 'b': driverType = video::EDT_DIRECT3D9;break;

       case 'c': driverType = video::EDT_DIRECT3D8;break;

       case 'd': driverType = video::EDT_BURNINGSVIDEO;break;

       case 'e': driverType = video::EDT_SOFTWARE; break;

       case 'f': driverType = video::EDT_NULL;     break;

       default: return 1;

   // create device and exit if creation failed

   IrrlichtDevice *device =

       createDevice(driverType, core::dimension2d<u32>(640, 480));

   if (device == 0)

       return 1; // could not create selected driver.

/*

   Get a pointer to the video driver and the SceneManager so that

   we do not always have to call irr::IrrlichtDevice::getVideoDriver() and

   irr::IrrlichtDevice::getSceneManager().

*/

   video::IVideoDriver* driver = device->getVideoDriver();

   scene::ISceneManager* smgr = device->getSceneManager();

/*

   To display the Quake 3 map, we first need to load it. Quake 3 maps

   are packed into .pk3 files which are nothing else than .zip files.

   So we add the .pk3 file to our irr::io::IFileSystem. After it was added,

   we are able to read from the files in that archive as if they are

   directly stored on the disk.

*/

   device->getFileSystem()->addZipFileArchive("../media/map-20kdm2.pk3");

/*

   Now we can load the mesh by calling

   irr::scene::ISceneManager::getMesh(). We get a pointer returned to an

   irr::scene::IAnimatedMesh. As you might know, Quake 3 maps are not

   really animated, they are only a huge chunk of static geometry with

   some materials attached. Hence the IAnimatedMesh consists of only one

   frame, so we get the "first frame" of the "animation", which is our

   quake level and create an Octree scene node with it, using

   irr::scene::ISceneManager::addOctreeSceneNode().

   The Octree optimizes the scene a little bit, trying to draw only geometry

   which is currently visible. An alternative to the Octree would be a

   irr::scene::IMeshSceneNode, which would always draw the complete

   geometry of the mesh, without optimization. Try it: Use

   irr::scene::ISceneManager::addMeshSceneNode() instead of

   addOctreeSceneNode() and compare the primitives drawn by the video

   driver. (There is a irr::video::IVideoDriver::getPrimitiveCountDrawn()

   method in the irr::video::IVideoDriver class). Note that this

   optimization with the Octree is only useful when drawing huge meshes

   consisting of lots of geometry.

*/

   scene::IAnimatedMesh* mesh = smgr->getMesh("20kdm2.bsp");

   scene::ISceneNode* node = 0;

   if (mesh)

       node = smgr->addOctreeSceneNode(mesh->getMesh(0), 0, -1, 1024);

//     node = smgr->addMeshSceneNode(mesh->getMesh(0));

/*

   Because the level was not modelled around the origin (0,0,0), we

   translate the whole level a little bit. This is done on

   irr::scene::ISceneNode level using the methods

   irr::scene::ISceneNode::setPosition() (in this case),

   irr::scene::ISceneNode::setRotation(), and

   irr::scene::ISceneNode::setScale().

*/

   if (node)

       node->setPosition(core::vector3df(-1300,-144,-1249));

/*

   Now we only need a camera to look at the Quake 3 map.

   We want to create a user controlled camera. There are some

   cameras available in the Irrlicht engine. For example the

   MayaCamera which can be controlled like the camera in Maya:

   Rotate with left mouse button pressed, Zoom with both buttons pressed,

   translate with right mouse button pressed. This could be created with

   irr::scene::ISceneManager::addCameraSceneNodeMaya(). But for this

   example, we want to create a camera which behaves like the ones in

   first person shooter games (FPS) and hence use

   irr::scene::ISceneManager::addCameraSceneNodeFPS().

*/

   smgr->addCameraSceneNodeFPS();

/*

   The mouse cursor needs not be visible, so we hide it via the

   irr::IrrlichtDevice::ICursorControl.

*/

   device->getCursorControl()->setVisible(false);

/*

   We have done everything, so lets draw it. We also write the current

   frames per second and the primitives drawn into the caption of the

   window. The test for irr::IrrlichtDevice::isWindowActive() is optional,

   but prevents the engine to grab the mouse cursor after task switching

   when other programs are active. The call to

   irr::IrrlichtDevice::yield() will avoid the busy loop to eat up all CPU

   cycles when the window is not active.

*/

   int lastFPS = -1;

   while(device->run())

       if (device->isWindowActive())

           driver->beginScene(true, true, video::SColor(255,200,200,200));

           smgr->drawAll();

           driver->endScene();

           int fps = driver->getFPS();

           if (lastFPS != fps)

               core::stringw str = L"Irrlicht Engine - Quake 3 Map example [";

               str += driver->getName();

               str += "] FPS:";

               str += fps;

               device->setWindowCaption(str.c_str());

               lastFPS = fps;

       else

           device->yield();

/*

   In the end, delete the Irrlicht device.

*/

   device->drop();

   return 0;

/*

That's it. Compile and play around with the program.

**/

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