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When associating indices with a CoglPrimitive you are now forced to specify the number of indices that should be read when drawing. It's easy to forget to call cogl_primitive_set_n_vertices() after associating indices with a primitive (and anyway you can see that someone could be led to believe Cogl can determine that implicitly somewhow) so this should avoid a lot of mistakes with using the API. We'd expect that setting indices and updating the n_vertices property would go hand in hand 99% of the time anyway so this change should be more convenient as well as less error prone. This patch adds some documentation for cogl_primitive_set_indices and cogl_primitive_get/set_n_vertices. It also tries to clarify how the CoglPrimitive:n_vertices property is updated and what that property means in relation to other functions too. https://bugzilla.gnome.org/show_bug.cgi?id=661019 Reviewed-by: Neil Roberts <neil@linux.intel.com>