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[cogl] avoid any state changes when cogl_set_backface_culling_enable is a nop
This is a simple optimization to bail out of cogl_set_backface_culling_enable if it's not resulting in a change of state.
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@ -270,6 +270,9 @@ cogl_set_backface_culling_enabled (gboolean setting)
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{
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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if (ctx->enable_backface_culling == setting)
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return;
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/* Currently the journal can't track changes to backface culling state... */
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_cogl_journal_flush ();
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