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Which part of OpenGL ES does make my iPhone App bit slow?

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By User



I am currently developing my iPhone App with OpenGL ES. It is mirror app with brightness and contrast. But the problem i am having now is it is bit slower(about 0.2s delay) when you use it. But the frame rate is about 60 seconds. So my quesion is which part of OpenGL takes time to process?




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  1. Tips For AllFebruary 9, 2012 at 1:22 AM

    What you have is lag (not slowness). And it's not caused by OpenGL (at least not entirely). The latencies happen in the camera and the process of reading and decoding the camera pictures.

    Some latency is unavoidable:


    It takes a whole video frame for the camers to capture the image and to encode the image into digital data
    It takes a whole display frame do draw the frame to the display.


    So the shortest lag you can get are about 1s/30 + 1s/60 = 0.05s

    Any latency above this is created due to processing overhead. And most likely I'd say yours comes from decoding the image and maybe buffer allocations in that process. However I'd need to see your sourcecode to tell for sure.

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