cocos2d programming guide翻译（12）

深度缓冲
默认情况下，cocos2d不使用深度缓冲，但是你可以创建一个当你初始化EAGLView用一个16位或者24位深度缓冲
EAGLView *glView = [EAGLView viewWithFrame:[window bounds]
                                               pixelFormat:kEAGLColorFormatRGBA8
                                           depthFormat:GL_DEPTH_COMPONENT24_OES];
GL_DEPTH_COMPONENT24_OES:24位深度缓冲
GL_DEPTH_COMPONENT16_OES:16位深度缓冲
0：没有深度缓冲被创建

高资源
自从v0.99.4开始，导演可以设置颜色来呈递缓冲再高资源模型里：
// Enables High Res mode (Retina Display) on iPhone 4 and maintains low res on all other devices
if ([UIScreen instancesRespondToSelector:@selector(scale)])
        [director setContentScaleFactor:[[UIScreen mainScreen] scale]];
从v0.99.5开始，开始支持视网膜屏幕显示：
// Enables High Res mode (Retina Display) on iPhone 4 and maintains low res on all other devices
if( ! [director enableRetinaDisplay:YES] )
        CCLOG(@"Retina Display Not supported");
它是怎么工作的：
如果你有一台iphon4，显示方案是960*640

多点抽样，或者全屏Anti_Aliasing
多点抽样可以执行在所有的设备上，但是在MBX设备中表现的冲击力更剧烈
怎么使用它
不要使用CC_DIRECTOR_INIT() macro。可以用下面的例子作为一个简单的模型
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
        // Init the window
        window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

// must be called before any other call to the director
        [CCDirector setDirectorType:kCCDirectorTypeDisplayLink];

// before creating any layer, set the landscape mode
        CCDirector *director = [CCDirector sharedDirector];

// landscape orientation
        [director setDeviceOrientation:kCCDeviceOrientationLandscapeLeft];

// set FPS at 60
        [director setAnimationInterval:1.0/60];

// Display FPS: yes
        [director setDisplayFPS:YES];

// Create an EAGLView with a RGB8 color buffer, and a depth buffer of 24-bits
        EAGLView *glView = [EAGLView viewWithFrame:[window bounds]
                   pixelFormat:kEAGLColorFormatRGBA8                // RGBA8 color buffer
                   depthFormat:GL_DEPTH_COMPONENT24_OES   // 24-bit depth buffer
                   preserveBackbuffer:NO
                   sharegroup:nil //for sharing OpenGL contexts between threads
                   multiSampling:NO //YES to enable it
                   numberOfSamples:0 //can be 1 - 4 if multiSampling=YES
        ];

// attach the openglView to the director
        [director setOpenGLView:glView];

// Enables High Res mode (Retina Display) on iPhone 4 and maintains low res on all other devices
        if( ! [director enableRetinaDisplay:YES] )
                CCLOG(@"Retina Display Not supported");

// make the OpenGLView a child of the main window
        [window addSubview:glView];

// make main window visible
        [window makeKeyAndVisible];

// Default texture format for PNG/BMP/TIFF/JPEG/GIF images
        // It can be RGBA8888, RGBA4444, RGB5_A1, RGB565
        // You can change anytime.
        [CCTexture2D setDefaultAlphaPixelFormat:kCCTexture2DPixelFormat_RGBA8888];

// create the main scene
        CCScene *scene = [...];

// and run it!
        [director runWithScene: scene];

return YES;
}