opengl-es - 尝试在后台线程中加载/设置场景导致 "OpenGL error 0x0502 in -[CCSprite draw] 530"

Question

我有一个 cocos2d v2.x 应用程序，它有一个场景，里面有很多 Sprite 、节点、配置、数据等......加载非常昂贵，以至于在将场景添加到导演时，有一个1/2 到 1 秒的暂停，导致当前正在运行的动画卡住，直到场景加载完毕。我分析了最慢的方法，并尝试在后台线程中异步执行它们，并在加载时显示进度微调器。

我的实现是这样的:

-(void)performAsyncLoad {
    self.progressSpinner.visible = YES;
    self.containerForLoadedStuff.visible = NO;
    self.mainContext = [EAGLContext currentContext];

    NSOperationQueue *queue = [NSOperationQueue new];
    NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self
                                                                            selector:@selector(loadDependencies)
                                                                              object:nil];
    [queue addOperation:operation];
}

-(void)loadDependencies {
    @autoreleasepool {
        glFlush();
        EAGLSharegroup *shareGroup = [[(CCGLView*)[[CCDirector sharedDirector] view] context] sharegroup];
        EAGLContext *context = [[EAGLContext alloc] initWithAPI:[[EAGLContext currentContext] API] sharegroup:shareGroup];
        [EAGLContext setCurrentContext:context];

        // ... expensive stuff here
        // [self.containerForLoadedStuff addChild:sprites, etc...]

        [self performSelectorOnMainThread:@selector(done) withObject:nil waitUntilDone:NO];
    }
}

-(void)done {
    glFlush();
    [EAGLContext setCurrentContext:self.mainContext];
    self.progressSpinner.visible = NO;
    self.containerForLoadedStuff.visible = YES;
}

不幸的是，这不起作用，一旦调用该操作，它就会在 CCTextureAtlas 的第 523 行的 EXC_BAD_ACCESS 崩溃

glDrawElements(GL_TRIANGLES, (GLsizei) n*6, GL_UNSIGNED_SHORT, (GLvoid*) (start*6*sizeof(_indices[0])) );

并且控制台日志显示了数十亿:

OpenGL error 0x0502 in -[CCSprite draw] 530

我究竟做错了什么？

更新

我改变了我的代码来做:

dispatch_queue_t queue = dispatch_queue_create("myqueue", NULL);
CCGLView *view = (CCGLView*)[[Director sharedDirector] view];
EAGLContext *context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2 sharegroup:[[view context] sharegroup]];

dispatch_async(queue, ^{
   [EAGLContext setCurrentContext:context];

   // expensive calls

   glFlush();
   [self performSelector:@selector(done) onThread:[[CCDirector sharedDirector] runningThread] withObject:nil waitUntilDone:NO];
   [EAGLContext setCurrentContext:nil];
});

它停止了崩溃，一切正常，但我仍然得到十亿:

OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530

任何想法为什么会发生这些错误以及如何阻止它们？

另一个更新

这毫无意义……显然这些错误来自向 CCSpriteBatchNode 添加 Sprite 。如果我将它们放在常规 CCNode 上，那么一切正常。搞什么鬼!？!？!？!？!

以及最后一次最终更新*

似乎有很多我不明白的废话。我已经设法使这些错误消失了 98%，但它们似乎仍然非常间歇性地随机发生。我做了大量的调试器和试错测试，发现这段代码:

-(void)loadDependencies {
    dispatch_queue_t queue = dispatch_queue_create("myqueue", NULL);
    CCGLView *view = (CCGLView*)[[Director sharedDirector] view];
    EAGLContext *context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2 sharegroup:[[view context] sharegroup]];

    dispatch_async(queue, ^{
       [EAGLContext setCurrentContext:context];

       [self.myObject doExpensiveStuff];

       glFlush();
       [self performSelector:@selector(done) onThread:[[CCDirector sharedDirector] runningThread] withObject:nil waitUntilDone:NO];
       [EAGLContext setCurrentContext:nil];
    });
}

-(void)done {
    [self.delegate completedAsyncStuff];
}

导致随机崩溃 - 通常 cocos removeFromParent 试图删除无效索引处的四边形......所以我尝试在处理它之前暂停对象..

//... background thread stuff:
[self.myObject pauseSchedulerAndActions];
[self.myObject doExpensiveStuff];
[self.myObject resumeSchedulerAndActions];

然后它不再崩溃，而是将大量 OpenGL 错误 0x0502 放入日志中的 -[CCSprite draw] 530 ......

然后我做了一些极端的日志记录来试图找出这些错误发生的地方......

... // previous code above... etc
       NSLog(@"gl flush...");
       glFlush();
       NSLog(@"after gl flush...");
       [self performSelector:@selector(done) onThread:[[CCDirector sharedDirector] runningThread] withObject:nil waitUntilDone:NO];
       [EAGLContext setCurrentContext:nil];
    });
}

-(void)done {
    NSLog(@"done scheduling notify delegate");
    [self scheduleOnce:@selector(notifyDelegate) delay:1];
}

-(void)notifyDelegate {
    NSLog(@"about to notify delegate");
    [self.delegate completedAsyncStuff];
}

在我的日志中，我看到:

gl flush
after gl flush
done scheduling notify delegate
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
OpenGL error 0x0502 in -[CCSprite draw] 530
about to notify delegate

所以当 cocos 等待触发预定选择器时会发生这些错误？？？？我勒个去!？我再也受不了了，也没有人能够帮助我，所以是时候悬赏了。

Answer 1

这是我的方法:

加载场景

-(void) onEnterTransitionDidFinish {
    [super onEnterTransitionDidFinish];
    [NSThread detachNewThreadSelector:@selector(loadGameSceneInAnotherThread) toTarget:self withObject:nil];
}

- (void) loadGameSceneInAnotherThread {
    NSAutoreleasePool *autoreleasepool = [[NSAutoreleasePool alloc] init];
    CCGLView *view = (CCGLView*)[[CCDirector sharedDirector] view];
    EAGLContext *auxGLcontext = [[EAGLContext alloc]
                                 initWithAPI:kEAGLRenderingAPIOpenGLES2
                                 sharegroup:[[view context] sharegroup]];

    if( [EAGLContext setCurrentContext:auxGLcontext] ) {
       self.gameScene = [GameScene sceneWithLevelName:levelName];
       self.gameLoadingDone = YES;
       glFlush();
       [EAGLContext setCurrentContext:nil];
    }
    [auxGLcontext release];
    [autoreleasepool release];
}


//this method ticks every 0.5sec
-(void) checkIfGameSceneLoaded {
    if (self.gameLoadingDone) {
        [self unschedule:@selector(checkIfGameSceneLoaded)];
        [[CCDirector sharedDirector] replaceScene:[CCTransitionFade transitionWithDuration:0.75 scene:self.gameScene]];
    }
}

但是，我不建议为场景加载背景……因为 cocos2d 并不是真正设计来这样做的……