ztenghui af6f7ed8dd Early rejection on shadows which are outside of the clip bound.
All the computations are estimated using bounding box.
TODO: Spot shadow could have more accurate but also more expensive methods, we need
more experiments to decide.

Change-Id: I9c10c419576cee55daf0f9f278b0db78cb847447
2014-03-20 15:25:47 -07:00
..
2014-02-25 11:00:41 -08:00