Set a rendering predicate.
- pPredicate [in]
- PredicateValue [in]
If TRUE, rendering will be affected by when the predicate's conditions are met. If FALSE, rendering will be affected when the conditions are not met.
The predicate must be in the "issued" or "signaled" state to be used for predication. While the predicate is set for predication, calls to ID3D10Asynchronous::Begin and ID3D10Asynchronous::End are invalid.
This method is used to denote that subsequent rendering and resource manipulation commands are not actually performed if the resulting Predicate data of the Predicate is equal to the PredicateValue. However, some Predicates are only hints, so they may not actually prevent operations from being performed.
The primary usefulness of Predication is to allow an application to issue graphics commands without taking the performance hit of spinning, waiting for ID3D10Asynchronous::GetData to return. So, Predication can occur while ID3D10Asynchronous::GetData returns S_FALSE. Another way to think of it: an application can also use Predication as a fallback, if it is possible that ID3D10Asynchronous::GetData returns S_FALSE. If ID3D10Asynchronous::GetData returns S_OK, the application can skip calling the graphics commands manually with it's own application logic.