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Added some code to retrieve the data in the gpu back to a cpu pointer
in the opengl helpers.
Added a framegraph node which specifies if any data must be downloaded
from the gpu
Added a flag in the buffer object to specify if the data from that
buffer must be downloaded.
Added a job to send the data back to the frontend.
Added a path in the renderer to download the gpu data.
Task number: QTBUG-57727
Change-Id: I315a9221e5116c7d07f818e00c654fe1901144f4
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
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