So when running my game in window mode my internal performance counter
is showing extremely spiky results. Frame times basically alternating
between 0.1ms to 30ms with average around 3ms this results in a
somewhat hitchy experience. Although when I look at OpenGL driver
monitor when my app is running I see "Buffer Swaps" pretty flat at
16ms. I get the same results on both ATI and NVIDIA GPUs (both in
MacBook Pros). My thought currently is that vsync is activated (even
though I disabled NSOpenGLCPSwapInterval) and that instead of blocking
when swapping the buffers it is just discards the frame or something.
The other curious thing is that I am using an NSTimer (as seen in the
CocoaGL sample) to trigger rendering every 16ms, so ended up with an
average of 3ms frames is a bit odd to me.
Anyways, is there some magic sauce I am missing here? Is my hypothesis
even close to being correct or could there be something else going on?
thanks,
-james
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