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Currently, we always do a surface flush when we try to establish a synchronized write transfer map. But if the subresource has not been modified, we can skip the surface flush. In other words, we only need to do a surface flush if the to-be-mapped subresource has been modified in this command buffer. With this patch, lightsmark2008 shows about 15% performance improvement. Reviewed-by: Brian Paul <brianp@vmware.com>
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