Experiments with microsoft concurrency runtime.

src/nvtt/TaskDispatcher.h

@@ -10,6 +10,17 @@
 #include <dispatch/dispatch.h>
 #endif
 
+#if NV_OS_WIN32 && _MSC_VER >= 1600
+#define HAVE_PPL 1
+#endif
+
+#if HAVE_PPL
+#include <array>
+//#include <ppl.h>
+#endif
+
+
+
 namespace nvtt {
 
     struct SequentialTaskDispatcher : public TaskDispatcher
@@ -51,5 +62,48 @@ namespace nvtt {
 
 #endif
 
+#if defined(HAVE_PPL)
+
+    class CountingIterator
+    {
+    public:
+        CountingIterator() : i(0) {}
+        CountingIterator(const CountingIterator & rhs) : i(0) {}
+        explicit CountingIterator(int x) : i(x) {}
+
+        //const int & base() const;
+        const int & operator*() const { return i; }
+        CountingIterator & operator++() { i++; return *this; }
+        CountingIterator & operator--() { i--; return *this; }
+
+    private:
+        int i;
+    };
+
+    struct TaskFunctor {
+        TaskFunctor(Task * task, void * context) : task(task), context(context) {}
+        void operator()(int & n) const {
+            n *= n;
+        }
+        Task * task;
+        void * context;
+    };
+
+    // Using Microsoft's concurrency runtime.
+    struct MicrosoftTaskDispatcher : public TaskDispatcher
+    {
+        virtual void dispatch(Task * task, void * context, size_t count)
+        {
+            CountingIterator begin(0);
+            CountingIterator end((int)count);
+            TaskFunctor func(task, context);
+
+            std::for_each(begin, end, func);
+            //std::parallel_for_each(begin, end, func);
+        }
+    };
+
+#endif
+
 
 } // namespace nvtt