OpenGL更改方向会导致iPad重新启动

[context presentRenderbuffer:GL_RENDERBUFFER_OES];

-(void) layoutSubviews {
    [EAGLContext setCurrentContext:context];

    glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
    [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(id<EAGLDrawable>) [self layer]];

    glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
    glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);

    glScissor(0, 0, [self bounds].size.width, [self bounds].size.height);

    NSLog(@\"%f -  %f\", [self bounds].size.width, [self bounds].size.height);

    glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
    glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES, backingWidth, backingHeight);

    [self erase];
    [self drawExisting];

    glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
    [context presentRenderbuffer:GL_RENDERBUFFER_OES];
}