For the pdp to GEM port of my freeframeGL host, I bump into a GEM shortcoming...<br><br>When processing a pix image in a GEM external, the image is passed to the processRGBAImage method.  You can access it during the length of the function, after which I suppose, the imagestruct is automatically passed to GEM for outputting.  <br>
What I want to do though, is outputting the image only when the next image is being started to process.  I&#39;ll explain why: I do a call to glReadPixels, which needs quite some time to finish, but by ussing Pixel Buffer Objects, I can do this transmitting from GPU to CPU asynchronously, so I can do stuff during the wait for glReadPixels to finish, then I can copy the buffer into the output image.  Best is to wait for the next image, which comes mostly more then 20ms later, so meanwhile the call can complete.<br>
GEMs design doesnt facilitate outputting an image after the end of the processing method though...  Is there some method internal to GEM that I can use to directly send some data to the image outlet?  Or does anyone have an idea how to wait for glReadPixels without at the same time blocking the CPU?<br>
<br>I can be found scrutinizing some more GEM source code...<br><br>