[Bug 763045] glmemoryallocator: Buffer size miss-match when mapping GLMemory without PBO

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763045

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Created attachment 323044
  --> https://bugzilla.gnome.org/attachment.cgi?id=323044&action=edit
glbasememory: Don't change maxsize at run-time

Maxsize is initialized once and should never change. Allocating data
should have no impact on the selected max size for this memory. This
causing memory map failure as the maxsize would become smaller then
size. This happened when using direct rendering in avviddec on GL that
does not support PBO transfer.

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