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POStuttering when using SurfaceTexture and Camera (Android 4.0 ICS)
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copied!<p>I have noticed an interesting bug when using <code>SurfaceTexture</code> with the <code>Camera</code>.</p> <p>If I setup a <code>SurfaceTexture</code>, pass it a valid <code>OpenGL</code> texture and pass that into the <code>Camera</code>, everything works great. I can then swap out the pixel shader with a simple shader and all still works great. But if I swap out the pixel shader with a more complex shader the framerate drops and stuttering appears.</p> <p>What seems to be happening is that a frame is getting processed out of order. After some hypothesizing I wondered if the hardware was being sent too much to do. After trying a number of things I found that if I just slept the gl processing thread for around 75 milliseconds or so the framerate jumped back up and the stuttering disappeared.</p> <p>This is an okay hack for now, but I worry that value is just an arbitrary guess based on my shader, and that it may change with other shaders or other phones. My question is: Is it possible to know when it is safe to send another frame down to OpenGL without over-taxing the system? (Or is something else going on here?)</p> <p>I have tried using <code>glFinish</code>, and <code>glFlush</code> but neither of these helped. I wondered if that was because the camera uses samplerExternalOES and somehow that effects it? </p> <p>Note: If I run the same <code>OpenGL</code> code using a <code>SurfaceView</code> instead I don't get any stuttering. Of course the performance isn't as good so that may be the reason it doesn't.</p>

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