[PATCH 6/7] glamor: Re-enable a8 textures for GLES2

[Eric Anholt]

Maarten Lankhorst <maarten.lankhorst at ubuntu.com> writes:

> This will probably break PVR, but fixes other implementations.

GL ES 2.0.25 spec says: "Formats not listed in table 4.5, including
compressed internal formats. are not color-, depth-, or
stencil-renderable, no matter which components they contain."

where table 4.5 has:
DEPTH_COMPONENT16
RGBA4
RGB5_A1
RGB565
STENCIL_INDEX8

So if there's an extension that adds support for ALPHA, you should
probably be checking for that.
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