Memory leak with Texture2D
I'm using Apple's Texture2D class from their CrashLanding example to draw dynamic text on the screen.
Here's my method:
- (void) drawText:(NSString*)textToDraw atX:(float)X andY:(float)Y {
glColor4f(0, 0, 0, 1.0);
Texture2D* _text = [[Texture2D alloc] initWithString:textToDraw dimensions:CGSizeMake(512, 512) alignment:UITextAlignmentLeft fontName:@"Arial" fontSize:11];
glBindTexture(GL_TEXTURE_2D, [_text name]);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glEnableClientState(GL_VERTEX_ARRAY);
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
[_text drawAtPoint:CGPointMake(.5,.5)];
[_text release];
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
}
I knew since this method loops, allocating it would cause a leak, so I hoped releasing it wouldn't case an issue. However, after around 10 seconds, despite releasing the Texture, the game crashes. I can't allocate the texture in the init method because that would limit the text to be static.
I also tried modifying the Texture2D class to allow dynamic text, but couldn't succeed.
Update: Crash report from the iPhone simulator
Process: Game [31087]
Path: /Users/robertfratto/Library/Application Support/iPhone Simulator/4.2/Applications/3AF59DDA-79AC-412D-A968-C80DABEC7B19/Game.app/Game
Identifier: Game
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: ??? [31088]
Date/Time: 2011-01-10 01:06:45.059 -0500
OS Version: Mac OS X 10.6.6 (10J567)
Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000
Crashed Thread: 4
Application Specific Information:
iPhone Simulator 235, iPhone OS 4.2 (iPhone (Retina)/8C134)
Thread 0: Dispatch queue: com.apple.main-thread
0 dyld 0x8fe12fae ImageLoaderMachOClassic::prefetchLINKEDIT(ImageLoader::LinkContext const&) + 124
1 dyld 0x8fe1316a ImageLoaderMachOClassic::rebase(ImageLoader::LinkContext const&) + 82
2 dyld 0x8fe104d4 ImageLoaderMachO::doRebase(ImageLoader::LinkContext const&) + 286
3 dyld 0x8fe0cdb1 ImageLoader::recursiveRebase(ImageLoader::LinkContext const&) + 91
4 dyld 0x8fe0de70 ImageLoader::link(ImageLoader::LinkContext const&, bool, bool, ImageLoader::RPathChain const&) + 158
5 dyld 0x8fe056af dyld::link(ImageLoader*, bool, ImageLoader::RPathChain const&) + 137
6 dyld 0x8fe0b242 dlopen + 471
7 libSystem.B.dylib 0x95fce8a8 dlopen + 66
8 com.apple.CoreGraphics 0x00ae3e71 load_function + 619
9 com.apple.CoreGraphics 0x00ae4016 CGLibraryLoadFunction + 193
10 com.apple.CoreGraphics 0x00b4501e load_library + 38
11 com.apple.CoreGraphics 0x00b450f5 load_vtable + 162
12 libSystem.B.dylib 0x95fe6900 pthread_once + 82
13 com.apple.CoreGraphics 0x00b44fec CGFontGetVTable + 37
14 com.apple.CoreGraphics 0x00ada052 CGFontFinderGetDefault + 28
15 com.apple.CoreGraphics 0x00b11c99 CGFontCreateWithFontName + 63
16 com.apple.CoreGraphics 0x00b11de6 CGFontCreateWithName + 57
17 GraphicsServices 0x011b9d3c GSFontCreateWithName + 494
18 UIKit 0x0019fa7b UINewFont + 100
19 UIKit 0x0019faa7 +[UIFont systemFontOfSize:traits:] + 33
20 UIKit 0x0019ee00 +[UIFont systemFontOfSize:] + 49
21 UIKit 0x0015a537 +[UILabel defaultFont] + 45
22 UIKit 0x0015ccc3 -[UILabel _commonInit] + 96
23 UIKit 0x0015ab0b -[UILabel initWithFrame:] + 98
24 Game 0x00002921 -[EAGLView initWithCoder:] + 264 (EAGLView.m:37)
25 UIKit 0x00232265 -[UIClassSwapper initWithCoder:] + 237
26 Foundation 0x00790c7c _decodeObjectBinary + 3296
27 Foundation 0x00791a4d -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] + 1354
28 Foundation 0x0079207c -[NSArray(NSArray) initWithCoder:] + 596
29 Foundation 0x00790c7c _decodeObjectBinary + 3296
30 Foundation 0x0078fde9 _decodeObject + 224
31 UIKit 0x00072c5f -[UIView initWithCoder:] + 642
32 UIKit 0x0005f709 -[UIWindow initWithCoder:] + 89
33 Foundation 0x00790c7c _decodeObjectBinary + 3296
34 Foundation 0x0078fde9 _decodeObject + 224
35 UIKit 0x00231f43 -[UIRuntimeConnection initWithCoder:] + 212
36 Foundation 0x00790c7c _decodeObjectBinary + 3296
37 Foundation 0x00791a4d -[NSKeyedUnarchiver _decodeArrayOfObjectsForKey:] + 1354
38 Foundation 0x0079207c -[NSArray(NSArray) initWithCoder:] + 596
39 Foundation 0x00790c7c _decodeObjectBinary + 3296
40 Foundation 0x0078fde9 _decodeObject + 224
41 UIKit 0x00231200 -[UINib instantiateWithOwner:options:] + 804
42 UIKit 0x00233081 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
43 UIKit 0x0003d943 -[UIApplication _loadMainNibFile] + 172
44 UIKit 0x0003e4ca -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 291
45 UIKit 0x00048db2 -[UIApplication handleEvent:withNewEvent:] + 1533
46 UIKit 0x00041202 -[UIApplication sendEvent:] + 71
47 UIKit 0x00046732 _UIApplicationHandleEvent + 7576
48 GraphicsServices 0x011bca36 PurpleEventCallback + 1550
49 CoreFoundation 0x00f29064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
50 CoreFoundation 0x00e896f7 __CFRunLoopDoSource1 + 215
51 CoreFoundation 0x00e86983 __CFRunLoopRun + 979
52 CoreFoundation 0x00e86240 CFRunLoopRunSpecific + 208
53 CoreFoundation 0x00e86161 CFRunLoopRunInMode + 97
54 UIKit 0x0003dfa8 -[UIApplication _run] + 636
55 UIKit 0x0004a42e UIApplicationMain + 1160
56 Game 0x00002510 main + 102 (main.m:13)
57 Game 0x000024a1 start + 53
Thread 1: Dispatch queue: com.apple.libdispatch-manager
0 libSystem.B.dylib 0x95fee982 kevent + 10
1 libSystem.B.dylib 0x95fef09c _dispatch_mgr_invoke + 215
2 libSystem.B.dylib 0x95fee559 _dispatch_queue_invoke + 163
3 libSystem.B.dylib 0x95fee2fe _dispatch_worker_thread2 + 240
4 libSystem.B.dylib 0x95fedd81 _pthread_wqthread + 390
5 libSystem.B.dylib 0x95fedbc6 start_wqthread + 30
Thread 2:
0 libSystem.B.dylib 0x95feda12 __workq_kernreturn + 10
1 libSystem.B.dylib 0x95fedfa8 _pthread_wqthread + 941
2 libSystem.B.dylib 0x95fedbc6 start_wqthread + 30
Thread 3: WebThread
0 libSystem.B.dylib 0x95fc80fa mach_msg_trap + 10
1 libSystem.B.dylib 0x95fc8867 mach_msg + 68
2 CoreFoundation 0x00f294a6 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x00e86874 __CFRunLoopRun + 708
4 CoreFoundation 0x00e86240 CFRunLoopRunSpecific + 208
5 CoreFoundation 0x00e86161 CFRunLoopRunInMode + 97
6 WebCore 0x01e4f423 RunWebThread(void*) + 499
7 libSystem.B.dylib 0x95ff585d _pthread_start + 345
8 libSystem.B.dylib 0x95ff56e2 thread_start + 34
Thread 4 Crashed:
Thread 4 crashed with X86 Thread State (32-bit):
eax: 0x00000000 ebx: 0x00000000 ecx: 0x00000000 edx: 0x00000000
edi: 0x00000000 esi: 0x00000000 ebp: 0x00000000 esp: 0x00000000
ss: 0x0000001f efl: 0x00010202 eip: 0x00000000 cs: 0x00000017
ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x0000001f
cr2: 0x00000000
Binary Images:
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asked on Stack Overflow Jan 10, 2011 by (unknown user) • edited Jan 10, 2011 by (unknown user)
2 Answers
You have to write
Texture2D* _text = [[Texture2D alloc] initWithString:textToDraw dimensions:CGSizeMake(512, 512) alignment:UITextAlignmentLeft fontName:@"Arial" fontSize:11];
instead of Texture2D* _text = [[[Texture2D alloc] initWithString:textToDraw dimensions:CGSizeMake(512, 512) alignment:UITextAlignmentLeft fontName:@"Arial" fontSize:11] autorelease];
It may be helpful for you.
answered on Stack Overflow Jan 10, 2011 by 
Tirth
TirthI'm not sure why, but it's crashing because of the (NSString*)theString argument. For now, although it's inconvenient, if a global variable is set to be displayed instead of a string defined through an argument, the game doesn't crash.
So if I create a separate drawText method for each string I'd like to draw, it will work.
answered on Stack Overflow Jan 10, 2011 by (unknown user)
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