[Bug 783521] New: gl: Add "direct" dmabuf uploader

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783521

            Bug ID: 783521
           Summary: gl: Add "direct" dmabuf uploader
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: dv at pseudoterminal.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently, the GStreamer OpenGL stack uses shaders to do the YUV->RGB
conversion. For that, it needs to be able to set up EGLImages with R8 and R8G8
pixel format. Some GPUs/drivers might not support that (etnaviv in its current
form for example).

In addition, some GPUs like the Vivante ones can perform the YUV->RGB
conversion internally, which means no custom conversion shaders are required.
Currently, it is not possible to make use of such a feature.

These set of patches introduce support for such internal converters. The
patches are not finished - in particular, the gluploader changes are WIP - but
they already work on i.MX6. The remaining issues are documented in the commit
messages, and also in the code as TODOs.

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