我在使用 iOS 6 MapKit 时偶尔会崩溃。实在无法重现。什么会导致这种情况？
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x00000044
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 IMGSGX543GLDriver 0x38f231b4 sgxTextureGetImageRowBytes(GLDTextureRec*, unsigned int, unsigned int) + 8
1 IMGSGX543GLDriver 0x38f23160 CalculateChunkPlaneSizes(GLDTextureRec*, int, unsigned int*, unsigned int*, unsigned int*, unsigned int*) + 104
2 IMGSGX543GLDriver 0x38f25906 sgxConfigureTexturePrivate(GLDTextureRec*) + 82
3 IMGSGX543GLDriver 0x38f24584 glrUpdateTexture + 616
4 libGPUSupportMercury.dylib 0x342c76b6 gldLoadFramebuffer + 102
5 GLEngine 0x31b50e52 gleUpdateDrawFramebufferState + 178
6 GLEngine 0x31b52556 gleDoDrawDispatchCoreES2 + 126
7 GLEngine 0x31aedbc0 gleDrawArraysOrElements_Entries_Body + 140
8 GLEngine 0x31aea5ec glDrawArrays_ES2Exec + 160
9 VectorKit 0x3780dcd6 -[VKSkyModel drawScene:withContext:] + 326
10 VectorKit 0x377e76d6 -[VKModelObject recursiveDrawScene:whenReadyWithContext:] + 118
11 VectorKit 0x377621ea -[VKMapModel recursiveDrawScene:withContext:] + 278
12 VectorKit 0x37762096 -[VKModelObject recursiveDrawScene:withContext:] + 186
13 VectorKit 0x3775d4da -[VKScreenCanvas onTimerFired:] + 1014
14 VectorKit 0x3775b548 -[VKMapCanvas onTimerFired:] + 500
15 VectorKit 0x3775a3d2 -[VKMainLoop displayTimerFired:] + 610
16 QuartzCore 0x3095b06c CA::Display::DisplayLink::dispatch(unsigned long long, unsigned long long) + 156
17 QuartzCore 0x3095afc4 CA::Display::IOMFBDisplayLink::callback(__IOMobileFramebuffer*, unsigned long long, unsigned long long, unsigned long long, void*) + 60
18 IOMobileFramebuffer 0x331e4fd4 IOMobileFramebufferVsyncNotifyFunc + 152
19 IOKit 0x36fc4446 IODispatchCalloutFromCFMessage + 190
20 CoreFoundation 0x382a95d8 __CFMachPortPerform + 116
21 CoreFoundation 0x382b4170 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32
22 CoreFoundation 0x382b4112 __CFRunLoopDoSource1 + 134
23 CoreFoundation 0x382b2f94 __CFRunLoopRun + 1380
24 CoreFoundation 0x38225eb8 CFRunLoopRunSpecific + 352
25 CoreFoundation 0x38225d44 CFRunLoopRunInMode + 100
26 GraphicsServices 0x3415f2e6 GSEventRunModal + 70
27 UIKit 0x351b72fc UIApplicationMain + 1116
28 MyApp 0x0005d78a main (main.m:14)
29 MyApp 0x0005d744 start + 36
我找到了这个。它可能会帮助您解决问题。
问题：基于 OpenGL ES 的应用程序在调用 PresentRenderBuffer 后显示“闪烁”或“陈旧”帧。
当 OpenGL ES 应用程序调用 EAGL PresentRenderbuffer 方法而不首先绘制任何内容时，可能会出现此症状。屏幕上看到的内容可能包含未初始化的像素或先前渲染的帧。要解决此问题，您应该始终在调用presentRenderbuffer 之前向帧缓冲区绘制一些内容。另请注意，除非您在 CAEAGLLayer 上设置 RetainedBackbuffer 属性以启用保留后备缓冲区模式，否则无法保证渲染缓冲区的内容在调用 PresentRenderbuffer 后保持有效。
-Lewis
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