Do depth copy in through mode as well

As always , not too sure if it is totally correct and may need more testing .Tested on my NV system and better performance loss than previously .(less than 10 FPS in unthrottling mode)

Tested with the following games that may require depth copy to work propertly

1. Saint Seiya Omega
2. Ys 7
3. Gundam AGE Universe
4. Jeanne D Arc