Databases
StackOverflow2013
Postsdbo
POiPhone/iPad, OpenGL ES, CADisplayLink
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POiPhone/iPad, OpenGL ES, CADisplayLink
    primarykey
    data
    text
    <p>I've just started playing with OpenGL ES, mostly on iPad and have noticed some problems I cannot find the answer to. First I've tried using two EAGLViews using separate renderers in the same window. Basically think the OpenGL ES example project in XCode but with two EAGLViews and two renderers etc. Now this does not seem to work in the simulator, it only shows one of the views (it seems to run the rendering code, but only one view is displayed with openGL) but when run on the device (an iPad using iOS 4.2) it does work, at least kind of which leads to the next question.</p> <p>The updates to the rendering is triggered using CADisplayLink on both these views. This does however cause some problems. Most of the time, after just a short while, the updates on one of the views stops, its CADisplayLink stops triggering. This only happens on the device and not in simulator. It can be "fixed" by using timers instead of CADisplayLink, or timer on one view and DisplayLink on the other, I would like to know what is causing this though. I'm creating the display link like this (in both views): </p> <p><code> self.displayLink = [NSClassFromString(@"CADisplayLink") displayLinkWithTarget:self selector:@selector(drawView:)];</p> <p>[displayLink setFrameInterval:animationFrameInterval];</p> <p>[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; </code></p> <p>Now the last question is about an odd thing I have noticed. When running the OpenGL ES example project provided in Xcode in the iPad simulator with the view resized below 760 in width, it does not render anything to screen, It only concerns the width though, the height can be resized in any way. It only happens in the simulator, not on the device.</p> <p>So the questions are basically if the things mentioned above are bugs, features or if I'm just doing it wrong?</p> <p>Thanks /j0h</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USj0h
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COFor the Simulator, does one of the views have dimensions that are not multiples of 32? If so, you may be hitting this issue: http://stackoverflow.com/questions/4430288/why-cant-i-see-certain-opengl-es-charts-in-the-4-2-simulator/4430726#4430726 , which would cause the OpenGL content not to be rendered.
      singulars
      1. POiPhone/iPad, OpenGL ES, CADisplayLink
      1. USBrad Larson
    2. COWhy do you need to have two OpenGL ES layers? Your performance may suffer by doing this, due to compositing: http://developer.apple.com/library/ios/#documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/WorkingwithEAGLContexts/WorkingwithEAGLContexts.html%23//apple_ref/doc/uid/TP40008793-CH103-SW29 . If possible, I'd recommend combining the two views into one OpenGL ES scene.
      singulars
      1. POiPhone/iPad, OpenGL ES, CADisplayLink
      1. USBrad Larson
    3. COAh, thanks for the links! I can confirm that the width problem was indeed that the view weren't a multiple of 32. If it is, the simulator renders as it should, at least as long as there is only one opengl layer. I would like to use only one layer too, however in this case, since I'm using a 3rd party component which uses its own OpenGL layer, I am forced to create my own. But thanks again for the answers!
      singulars
      1. POiPhone/iPad, OpenGL ES, CADisplayLink
      1. USj0h
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload