CODEWITHSUNDEEP
iosuiviewopengl-es-2.0xcode-storyboardeaglview
user2096853
user2096853

Reputation: 41

iOS app: OpenGL Views within Storyboard-based Application

I have been working on an iOS, OpenGL-based app for the past few months. During this time, I have created both the main UIWindow and a single UIView in code, as opposed to using a storyboard. An important item to note is that I create an instance of EAGLView (used in many Apple examples), which inherits from UIView.

The code base I am working with is quite extensive, and among other things, it uses a separate rendering thread. I'll come back to this point near the end of this post.

With this in mind, I am now at the point that I want to add native UI support. To do this, I am using a storyboard (for the first time). My current setup consists of a main/root view with two buttons. Each button uses a modal segue to place a new view on the screen.

To reuse as much code as possible, I have specified that the views I segue to are of type EAGLView (as opposed to UIView). The only change I've had to make is that instead of initializing with "initWithFrame", I now initialize with "initWithCoder".

Other than moving to a storyboard, nothing else in the code base has changed. However, when I segue to an EAGLView, nothing renders -- all I see is white. I am hesitant to use GLKit because it duplicates much of the functionality I have already written (I had everything rendering just fine prior to using a storyboard). In addition, GLKit provides a callback for rendering, whereas, I have a separate render thread.

My scenario sounds a lot like this post:

OpenGL iOS view does not paint

I have GL error checks for every call (or for every group of calls), and no errors are being reported. What's even stranger is that when I capture an OpenGL ES frame for debugging (in Xcode), the debugger actually shows the content I expect to see.

Any ideas here? I am stumped.

Upvotes: 1

Views: 724

Answers (1)

StatusReport
StatusReport

Reputation: 3427

Please try the following:

  1. Verify that you stop rendering in the view that you're segueing from (stopping times etc.) - this view is still alive since you only pushed a new EAGLView on top of it.
  2. Use XCode's OpenGL ES Frame capture to debug your OpenGL state in the new view. Verify that you're not missing binding to textures or other objects.
  3. If the above doesn't work - write the simplest rendering possible (simple quad, for example) and debug that code.

Upvotes: 0

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