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Hawkeye - OpenGL Trace

OpengGLTrace is used to track the memory usage of OpenGL resources, and to help find OpenGL API error calls and exception parameter passing.

OpenGL Trace is base on MTGLDebug, which inject tracking logic into the OpenGL API through fishhook.

Usage

OpenGL Trace is closed after add to MTHawkeyeClient, you need to enable it manually:

  1. Tap MTHawkeye floating window, enter the main panel.
  2. Tap navigation title view, show the MTHawkeye panel switching view.
  3. Tap Setting in the upper right corner of the switching view, enter the Setting view home.
  4. Find Graphic and go to OpenGL Trace
    • Enable OpenGL Trace, trace the resource usage by OpenGL
    • Enable Analysis (Base on OpenGL Trace), help to find out API error calls and exception parameter passing.
    • Enable Raise Exception Enabled (Base on Analysis), throw exception when Analysis find the errors.

OpenGL Trace Setting

OpenGL Resource Usage Trace

After OpenGL Trace is on, you can see the tacked OpenGL resource object on the main panel. Currently include:

  • Texture
  • Program
  • FrameBuffer
  • RenderBuffer

OpenGL Trace Living Objects 2

By default the panel shows all the resource objects that are still alive.

You can select a time range, view resources created during that time and still not released yet.

OpenGL Trace Living Objects 2 OpenGL Trace Living Objects 3

Trace OpenGL common error calls and parameter exception

When the OpenGL Trace and Analysis are both on, it'll trace the common OpenGL call logic and parameters usage. Include following strategies:

  • Access a resource handle that has never been created in any context.
  • Access a resource whose context has been deleted.
  • The resource handle of another context is logically deleted, and the texture handle may be the same when the two contexts are not shared.
  • Access resource handles across contexts.
  • OpenGL function is not called under a valid OpenGL context.
  • Texture object size is 0.

The detecting result will be throw from MTGLDebug though delegate method glDebugErrorMessageHandler:errorType:, while Raise Exception Enabled is enabled, the message will be convert to exception and throw.

You can add your own logic to handle the result by implement the glTracer:didReceivedErrorMsg: under MTHOpenGLTraceDelegate protocol.

Storage

While the OpenGLTrace is on, the OpenGL resource usage value will store under Records file. Use a collection name gl-mem, key as the time store happens, value is the resource usage value, in MB.