working on aobench

examples_cuda/aobench/ao.ispc

@@ -40,6 +40,16 @@
 
 typedef float<3> vec;
 
+#ifdef __NVPTX__
+#warning "emitting DEVICE code"
+#define programCount warpSize()
+#define programIndex laneIndex()
+#define taskIndex    blockIndex0()
+#define taskCount    blockCount0()
+#else
+#warning "emitting HOST code"
+#endif
+
 struct Isect {
     float      t;
     vec        p;