Question

I have an iPhone application that is mostly using standard controls. There is one view that is rendered in OpenGL (fancy graphs). In the interest of saving myself a lot of work, I looked around and found Cocos2d. It looks like it has exactly what I need (OpenGL ES, relatively simple to work with), but I’ve run into a problem.

I don’t know how to limit Cocos2d to exist in just a single view. Before, I implemented my OpenGL stuff in a view and used a simple ViewController to present it within a navigation controller. Here, Cocos2d seems to need to do a lot more, and I’m unsure how to stuff it into the same ViewController/View approach I did with raw OpenGL.

UPDATE: This is what I was doing. Flip to the next bold to see what I’m doing now.

#import <UIKit/UIKit.h>


@interface CocosController : UIViewController {
    UIWindow *window;
}

@property (nonatomic,retain) UIWindow *window;

@end

And my CocosController.m:

#import "CocosController.h"
#import "SomeScene.h"
#import "cocos2d.h"

@implementation CocosController

@synthesize window;

// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
    // Initialization code
    CC_DIRECTOR_INIT();
    CCDirector *director = [CCDirector sharedDirector];

    //landscape
    [director setDeviceOrientation:kCCDeviceOrientationLandscapeLeft];
    [director setDisplayFPS:true];

    //turn on multi-touch
    EAGLView *cocosView = [director openGLView];
    [cocosView setMultipleTouchEnabled:true];

    self.view = cocosView;

    //default texture formats...
    [CCTexture2D  setDefaultAlphaPixelFormat:kTexture2DPixelFormat_RGBA8888];

    [[CCDirector sharedDirector] runWithScene:[SomeScene scene]];
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [[CCDirector sharedDirector] purgeCachedData];
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [[CCDirector sharedDirector] release];
    [window release];
    [super dealloc];
}


@end

And, finally, how I’m trying to present it (in a button click):

CocosController *cocosController = [[CocosController alloc] init];
[[self navigationController] pushViewController:cocosController animated:true];

This is the new approach, same results though.

ApplicationDidFinish portion of my AppDelegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    // Override point for customization after application launch.
    if( ! [CCDirector setDirectorType:kCCDirectorTypeDisplayLink] )
        [CCDirector setDirectorType:kCCDirectorTypeThreadMainLoop];

    CCDirector *director = [CCDirector sharedDirector];
    [director setDisplayFPS:YES];

    state = kStateEnd;

    // Add the navigation controller's view to the window and display.
    [window addSubview:navigationController.view];
    [window makeKeyAndVisible];

    return YES;
}

CocosController I’m using to present the view:

#import "CocosController.h"
#import "cocos2d.h"
#import "SomeScene.h"

@implementation CocosController

@synthesize mainView;

// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
    EAGLView *glview = [EAGLView viewWithFrame:CGRectMake(0, 0, 250,350)];
    [mainView addSubview:glview];

    CCDirector *director = [CCDirector sharedDirector];
    [director setOpenGLView:glview];

    CCScene *scene = [CCScene node];
    id node = [SomeScene node];
    [scene addChild: node];

    [director runWithScene:scene];
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}

@end

And this bit is from a button click in a details ViewController I have that is supposed to make this whole thing appear:

CocosController *cc = [[CocosController alloc]init];
cc.mainView = self.view;
[[self navigationController] pushViewController:cc animated:false];

Answer 1

float row = (a % itemsPerRow) * texStepX;

The above line of code was where the app was crashing every time I tried another way to get the view running. I finally just tried to look it up, thinking I wouldn’t find anything. Turns out, cocos2d makes an assumption that an image, fps_images.png, is assumed to be in the project. If it’s not, this particular bit of cocos2d explodes with an arithmetic exception.

Took two seconds to fix by just finding fps_images.png in the cocos2d directory and adding it to the Resources folder of my project.

sigh