Robert Bragg ad9db72f74 Expose COGL_FEATURE_ID_BUFFER_AGE feature id
This adds a new COGL_FEATURE_ID_BUFFER_AGE feature id that can be used
to determine if cogl_onscreen_get_buffer_age() will ever return an age
other than 0. This should be used instead of querying the winsys feature
via cogl_clutter_winsys_has_feature().

Reviewed-by: Neil Roberts <neil@linux.intel.com>
2014-03-20 17:34:04 +00:00
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