add gray8 format support to glupload (0.10)

[Sebastian Dröge]

On Fr, 2013-08-30 at 15:29 +0800, comic fans wrote:
> Hello everyone ,this is a simple patch to implement gray8 format
> support on glupload element. I  only put this support on OpenGL code
> path  (have not apply to GLES code path) , and test this code on my
> AMD HD 6310 (GPU in E-350 APU , fglrx 12.104)  with following
> command :
> 
> gst-launch-0.10 videotestsrc ! video/x-raw-gray, bpp=\(int\)8, depth=
> \(int\)8 , width=\(int\)640, height=\(int\)480, framerate=\(fraction
> \)4/1, pixel-aspect-ratio=\(fraction\)1/1 !  glupload ! glimagesink  .
> 
>  it use luminance texture , which should be supported by most graphics
> card.  attachment is the patch file, thank you for reviewing.

GStreamer 0.10 is no longer maintained, but if you want to update your
patch to gst-plugins-gl in git master we can include it :)

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