[Piglit] [PATCH] shader_runner: Only call glMemoryBarrier when supported

[Kenneth Graunke]

On Saturday, June 21, 2014 08:34:05 PM Chris Forbes wrote:
> Ian,
> 
> That's true, but... we will probably have compute finished long before 
images.
> 
> Is there an acceptable thing to do here in the interim?
> 
> -- Chris

How?  As I understand it, compute shaders can really only output anything via 
ARB_shader_image_load_store or ARB_shader_storage_buffer_object.  And if they 
can't output anything, what's the point of having them?

Perhaps I'm mistaken, and you can do useful things with them...I guess you 
could maybe just use atomic buffers, but...

--Ken
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