[Bug 796493] kmssink: add support for GBM allocator

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796493

Randy Li (ayaka) <ayaka at soulik.info> changed:

           What    |Removed                     |Added
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 Attachment #372643|needs-work                  |none
             status|                            |
 Attachment #372643|0                           |1
        is obsolete|                            |

--- Comment #6 from Randy Li (ayaka) <ayaka at soulik.info> ---
Created attachment 372662
  --> https://bugzilla.gnome.org/attachment.cgi?id=372662&action=edit
Add fallback method

Thank for you reviewing.
The main reason I don't move it to -base is that I am not familiar with EGL and
confusing with the gl allocator.
Another is that I want to verify this modification as quickly as possible, the
GPU work more slowly than kms. Also it should be fixed for waylandsink. Can you
give me some guide on the libgstgl?

About this commit, it works well on the allocation and import part with those
pixel format that gbm driver doesn't support. But I failed in export dmabuf
part(with those pixel format is not supported) when I use the buffer in the
other device beyond the GPU.

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