// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include "primitive.h"
#include "../common/scene_instance_array.h"

namespace embree
{
  //template<int M>
  struct InstanceArrayPrimitive
  {
    struct Type : public PrimitiveType
    {
      const char* name() const;
      size_t sizeActive(const char* This) const;
      size_t sizeTotal(const char* This) const;
      size_t getBytes(const char* This) const;
    };
    static Type type;

  public:

    /* primitive supports multiple time segments */
    static const bool singleTimeSegment = false;

    /* Returns maximum number of stored primitives */
    static __forceinline size_t max_size() { return 1; }

    /* Returns required number of primitive blocks for N primitives */
    static __forceinline size_t blocks(size_t N) { return N; }

  public:

    InstanceArrayPrimitive (const uint32_t geomID, const uint32_t primID)
    : primID_(primID)
    , instID_(geomID)
    {}

    __forceinline bool valid() const { 
      return primID_ != -1;
    }

    void fill(const PrimRef* prims, size_t& i, size_t end, Scene* scene)
    {
      assert(end-i == 1);
      const PrimRef& prim = prims[i]; i++;
      const unsigned int geomID = prim.geomID();
      const unsigned int primID = prim.primID();
      new (this) InstanceArrayPrimitive(geomID, primID);
    }

    __forceinline LBBox3fa fillMB(const PrimRef* prims, size_t& i, size_t end, Scene* scene, size_t itime)
    {
      assert(end-i == 1);
      const PrimRef& prim = prims[i]; i++;
      const unsigned int geomID = prim.geomID();
      const size_t primID = prim.primID();
      new (this) InstanceArrayPrimitive(geomID, primID);
      const InstanceArray* instanceArray = scene->get<InstanceArray>(geomID);
      return instanceArray->linearBounds(primID,itime);
    }

    __forceinline LBBox3fa fillMB(const PrimRefMB* prims, size_t& i, size_t end, Scene* scene, const BBox1f time_range)
    {
      assert(end-i == 1);
      const PrimRefMB& prim = prims[i]; i++;
      const unsigned int geomID = prim.geomID();
      const size_t primID = prim.primID();
      new (this) InstanceArrayPrimitive(geomID, primID);
      const InstanceArray* instanceArray = scene->get<InstanceArray>(geomID);
      return instanceArray->linearBounds(primID,time_range);
    }

    /* Updates the primitive */
    __forceinline BBox3fa update(InstanceArray* instanceArray) {
      return instanceArray->bounds(0);
    }

  public:
    unsigned int primID_;
    unsigned int instID_;
  };
}