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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #5 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
The spec allows GL_RED/GL_RG as an internal format so your drivers are not
compliant.

>From the GLES 3.0.1 spec, section 3.8.3, page 125.

"If internalformat is specified as a base internal format, the GL stores the
resulting texture with internal component resolutions of its own choosing."

GLES 2.0 doesn't contain RG textures so we rely on the GL_EXT_texture_rg
extension from
https://www.khronos.org/registry/gles/extensions/EXT/EXT_texture_rg.txt which
states:

"Accepted by the <internalformat> parameter of TexImage2D and CopyTexImage2D,
and the <format> parameter of TexImage2D, TexSubImage2D, and ReadPixels:

RED_EXT 0x1903
RG_EXT  0x8227"

If by some weird reason there's GL_ARB_texture_rg support with your drivers,
they also contain the exact same statement as GL_EXT_texture_rg (albeit with
more formats).

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