[Bug 763021] glmemory: fix copy texture fail using glCopyTexImage2D()

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763021

--- Comment #4 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Matthew Waters (ystreet00) from comment #2)
> Just curious as to what system/platforms you saw this on?
> 
> The only case I've seen this matter is on iOS where they implement a
> different rg texture extension to everyone else and seem to not conform to
> their own rg texture extension.
> 
> The internal format doesn't technically have to be sized everywhere, i.e.
> you can pass base internal formats on most systems and have things work.
> 
> That being said, we've done this for all the other texture operations, may
> as well do it for copy as well.
Hi Matthew,

I meet this case on i.Mx6Q for Linux. The GPU vendor is vivante GC2000. If I
use texture format such as GL_RED, copy texture will fail. But change to use
GL_R8, it works ok. I think we should call API according to the GL spec because
some Embedded systems may have limitation.

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