[Glamor] ARB_buffer_storage support

[gongzg]

Hi, 

ARB_buffer_storage is a GL 4.x feature and may not work if the system
have an older version OpenGL library. Could you modify it to not break
the old version OpenGL? Thanks.



On Sun, Mar 02, 2014 at 03:13:50PM +0100, Grigori Goronzy wrote:
> These patches use ARB_buffer_storage for persistent mappings. Based
> on Eric Anholt's and Alex Deucher's previous patches. They apply on
> top of Alex's earlier patch series.
> 
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