Added frustum plane extraction and sphere culling code.

Change-Id: I9d55baecddc962f8973f0269f2f9977f1d4ce008
diff --git a/libs/rs/rsProgramVertex.h b/libs/rs/rsProgramVertex.h
index 1c8b9c8..a17c9ea 100644
--- a/libs/rs/rsProgramVertex.h
+++ b/libs/rs/rsProgramVertex.h
@@ -43,6 +43,7 @@
     void addLight(const Light *);
 
     void setProjectionMatrix(const rsc_Matrix *) const;
+    void getProjectionMatrix(rsc_Matrix *) const;
     void setModelviewMatrix(const rsc_Matrix *) const;
     void setTextureMatrix(const rsc_Matrix *) const;