[Bug 704222] gldownload: Support for multi-planar format for GLES

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704222
  GStreamer | gst-plugins-bad | git

--- Comment #25 from Matthew Waters <ystreet00 at gmail.com> 2014-05-29 09:28:21 UTC ---
(In reply to comment #23)
> Not sure to follow, but GLES3 mention GL_LUMINANCE in the format description
> (and seems to depend on GL_IMPLEMENTATION_COLOR_READ_FORMAT)
> https://www.khronos.org/opengles/sdk/docs/man3/ and
> https://www.khronos.org/opengles/sdk/docs/man3/html/glReadPixels.xhtml

Download requires glReadPixels support for the number of components we are
attempting to download.  The actual GLES2/3 spec only allows the format to be
RGBA/UNSIGNED_BYTE or the implementation/framebuffer specific read format.  If
we can get a gl format that fits then it will work however there are no
guarentees as to the format and thus whether it will work.

> (I do not remember if it was really working with gstgl-0.10
> http://cgit.freedesktop.org/gstreamer/gst-plugins-gl/tree/gst-libs/gst/gl/gstgldisplay.c?h=0.10#n3613
> )

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