iOS OpenGL ES 求助

layject 2016-12-03 10:26:17

做iOS平台的OpenGL程序
基本框架按照《iPhone 3D Programming》书中介绍的来
其GLView封装在一个类里，相关代码如下



- (id) initWithFrame: (CGRect) frame

{

    NSLog(@"fram e %f",frame.origin.x);

    if (self = [super initWithFrame:frame])

    {

        CAEAGLLayer* eaglLayer = (CAEAGLLayer*) self.layer;

        eaglLayer.opaque = YES;



        EAGLRenderingAPI api = kEAGLRenderingAPIOpenGLES2;

        m_context = [[EAGLContext alloc] initWithAPI:api];

        

        if (!m_context) {

            api = kEAGLRenderingAPIOpenGLES1;

            m_context = [[EAGLContext alloc] initWithAPI:api];

        }

        

        if (!m_context || ![EAGLContext setCurrentContext:m_context]) {

            [self release];

            return nil;

        }

        m_resourceManager = Darwin::CreateResourceManager();

       m_applicationEngine = ParametricViewer::CreateApplicationEngine(m_renderingEngine);

        [m_context

            renderbufferStorage:GL_RENDERBUFFER

            fromDrawable: eaglLayer];

                

        int width = CGRectGetWidth(frame);

        int height = CGRectGetHeight(frame);

        

        NSLog(@"gl w - h    %d\t%d", width , height );

        m_applicationEngine->Initialize(width-50, height-50);

        [self drawView: nil];        

        CADisplayLink* displayLink;

        displayLink = [CADisplayLink displayLinkWithTarget:self

                                     selector:@selector(drawView:)];

        

        [displayLink addToRunLoop:[NSRunLoop currentRunLoop]

                     forMode:NSDefaultRunLoopMode];

    }

    return self;

}



- (void) drawView: (CADisplayLink*) displayLink

{

    if (displayLink != nil) {

        float elapsedSeconds = displayLink.timestamp - m_timestamp;

        m_timestamp = displayLink.timestamp;

        m_applicationEngine->UpdateAnimation(elapsedSeconds);

    }

    

    m_applicationEngine->Render();



    [m_context presentRenderbuffer:GL_RENDERBUFFER];

}

目前遇到的问题是
在两个ViewController中各有一个该GLView实例，在两个界面切换时必须重新初始化
否则无法正常显示，导致在切换界面时内存不停泄漏，直至程序崩溃

初始化相关代码如下

http://

-(void) viewWillAppear:(BOOL)animated

{

    if(new_display)

    {

      //  [m_view release];

        CGRect screenBounds = [[UIScreen mainScreen] bounds];

        screenBounds.origin.y = 100 ;

        screenBounds.size.height -= 200 ;

               m_view = [[GLView alloc] initWithFrame: screenBounds];

        [self.view addSubview:m_view];

        new_display = false ;

    }

}



- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

    

    CGRect screenBounds = [[UIScreen mainScreen] bounds];

    screenBounds.origin.y = 100 ;

    screenBounds.size.height -= 200 ;

    if(g_crc)

    t_crc = *g_crc;

    

    viewport_h =320 ,viewport_w =368;

    m_view = [[GLView alloc] initWithFrame: screenBounds];

    [self.view addSubview:m_view];





    

}

感觉问题有以下两个关键点
一是从根本上在OpengGL ES处解决，即如何保证GLView两个实例不冲突,可以同时正常显示
二是在初始化GLView实例时彻底释放内存
目前尝试将GL_RENDERBUFFER设为变量，在重新初始化m_view前加 [m_view release]释放内存;
都没有解决问题。
之前用c，c＋＋，第一次开发iOS程序
求助高手，谢谢。

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