// ======================================================================== //
// Copyright 2009-2017 Intel Corporation                                    //
//                                                                          //
// Licensed under the Apache License, Version 2.0 (the "License");          //
// you may not use this file except in compliance with the License.         //
// You may obtain a copy of the License at                                  //
//                                                                          //
//     http://www.apache.org/licenses/LICENSE-2.0                           //
//                                                                          //
// Unless required by applicable law or agreed to in writing, software      //
// distributed under the License is distributed on an "AS IS" BASIS,        //
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. //
// See the License for the specific language governing permissions and      //
// limitations under the License.                                           //
// ======================================================================== //

#pragma once

#include "default.h"

/* Makros to gather statistics */
#ifdef EMBREE_STAT_COUNTERS
#  define STAT(x) x
#  define STAT3(s,x,y,z) \
  STAT(Stat::get().code  .s+=x);               \
  STAT(Stat::get().active.s+=y);               \
  STAT(Stat::get().all   .s+=z);
#  define STAT_USER(i,x) Stat::get().user[i]+=x;
#else
#  define STAT(x)
#  define STAT3(s,x,y,z)
#  define STAT_USER(i,x) 
#endif

namespace embree
{
  /*! Gathers ray tracing statistics. We count 1) how often a code
   *  location is reached, 2) how many SIMD lanes are active, 3) how
   *  many SIMD lanes reach the code location */
  class Stat
  { 
  public:

    static const size_t SIZE_HISTOGRAM = 64+1;

    /*! constructs stat counter class */
    Stat ();

    /*! destructs stat counter class */
    ~Stat ();

    class Counters 
    {
    public:
      Counters () { 
        clear(); 
      }
      
      void clear() 
      { 
        all.clear();
        active.clear();
        code.clear();
        for (auto& u : user) u.store(0);
      }

    public:

	/* per packet and per ray stastics */
	struct 
        {
          void clear () {
            normal.clear();
            shadow.clear();
          }

	  /* normal and shadow ray statistics */
	  struct 
          {
            void clear() 
            {
              travs.store(0);
              trav_nodes.store(0);
              trav_leaves.store(0);
              trav_prims.store(0);
              trav_prim_hits.store(0);
              for (auto& v : trav_hit_boxes) v.store(0);
              trav_stack_pop.store(0);
              trav_stack_nodes.store(0); 
              trav_xfm_nodes.store(0); 
            }

          public:
	    std::atomic<size_t> travs;
	    std::atomic<size_t> trav_nodes;
	    std::atomic<size_t> trav_leaves;
	    std::atomic<size_t> trav_prims;
	    std::atomic<size_t> trav_prim_hits;
	    std::atomic<size_t> trav_hit_boxes[SIZE_HISTOGRAM+1];
	    std::atomic<size_t> trav_stack_pop;
	    std::atomic<size_t> trav_stack_nodes; 
            std::atomic<size_t> trav_xfm_nodes; 
            
	  } normal, shadow;
	} all, active, code; 

        std::atomic<size_t> user[10];
    };

  public:

    static __forceinline Counters& get() {
      return instance.cntrs;
    }
    
    static void clear() {
      instance.cntrs.clear();
    }
    
    static void print(std::ostream& cout);

  private: 
    Counters cntrs;

  private:
    static Stat instance;
  };
}