Dogcows Code - chaz/yoink/blob - src/Moof/Octree.hh

   1
   2 /*******************************************************************************
   3
   4  Copyright (c) 2009, Charles McGarvey
   5  All rights reserved.
   6
   7  Redistribution   and   use  in  source  and  binary  forms,  with  or  without
   8  modification, are permitted provided that the following conditions are met:
   9
  10    * Redistributions  of  source  code  must retain the above copyright notice,
  11      this list of conditions and the following disclaimer.
  12    * Redistributions  in binary form must reproduce the above copyright notice,
  13      this  list of conditions and the following disclaimer in the documentation
  14      and/or other materials provided with the distribution.
  15
  16  THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19  DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  20  FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22  SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  23  CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26
  27 *******************************************************************************/
  28
  29 #ifndef _MOOF_OCTREE_HH_
  30 #define _MOOF_OCTREE_HH_
  31
  32 #include <algorithm>
  33 #include <list>
  34
  35 #include <boost/shared_ptr.hpp>
  36
  37 #include <stlplus/ntree.hpp>
  38
  39 #include <Moof/Aabb.hh>
  40 #include <Moof/Drawable.hh>
  41 #include <Moof/Entity.hh>
  42 #include <Moof/Math.hh>
  43 #include <Moof/Sphere.hh>
  44
  45
  46 namespace Mf {
  47
  48
  49 class Camera;
  50
  51
  52 struct OctreeNode;
  53 typedef stlplus::ntree<OctreeNode>::iterator OctreeNodeP;
  54
  55 class Octree;
  56 typedef boost::shared_ptr<Octree> OctreeP;
  57
  58
  59 struct OctreeNode : public Entity
  60 {
  61         std::list<EntityP> objects;
  62
  63         OctreeNode()
  64         {
  65                 aabb_.min = Vector3(-1.0, -1.0, -1.0);
  66                 aabb_.max = Vector3(1.0, 1.0, 1.0);
  67                 sphere_.init(Vector3(0.0, 0.0, 0.0), 1.41421);
  68         }
  69
  70         OctreeNode(const Aabb& aabb)
  71         {
  72                 aabb_ = aabb;
  73                 sphere_.point = aabb.getCenter();
  74                 sphere_.radius = (aabb.min - sphere_.point).length();
  75         }
  76
  77         void draw(Scalar alpha) const
  78         {
  79                 std::list<EntityP>::const_iterator it;
  80
  81                 for (it = objects.begin(); it != objects.end(); ++it)
  82                 {
  83                         (*it)->draw(alpha);
  84                 }
  85
  86                 if (!objects.empty())
  87                         aabb_.draw(); // temporary
  88         }
  89
  90         void drawIfVisible(Scalar alpha, const Camera& cam) const
  91         {
  92                 std::list<EntityP>::const_iterator it;
  93
  94                 for (it = objects.begin(); it != objects.end(); ++it)
  95                 {
  96                         (*it)->drawIfVisible(alpha, cam);
  97                 }
  98
  99                 if (!objects.empty())
 100                         aabb_.draw();
 101         }
 102
 103
 104         bool isVisible(const Camera& cam) const
 105         {
 106                 if (sphere_.isVisible(cam))
 107                 {
 108                         return aabb_.isVisible(cam);
 109                 }
 110
 111                 return false;
 112         }
 113
 114
 115         static bool compareZOrder(EntityP a, EntityP b)
 116         {
 117                 return a->getSphere().point[2] < b->getSphere().point[2];
 118         }
 119
 120         void sort()
 121         {
 122                 //std::sort(objects.begin(), objects.end(), compareZOrder);
 123                 objects.sort(compareZOrder);
 124         }
 125 };
 126
 127
 128 class Octree
 129 {
 130         OctreeNodeP insert(EntityP entity, OctreeNodeP node);
 131
 132         void addChild(OctreeNodeP node, int index);
 133
 134         void draw(Scalar alpha, OctreeNodeP node);
 135         void drawIfVisible(Scalar alpha, const Camera& cam, OctreeNodeP node);
 136
 137         stlplus::ntree<OctreeNode> tree_;
 138
 139 public:
 140
 141         inline static OctreeP alloc(const OctreeNode& rootNode)
 142         {
 143                 return OctreeP(new Octree(rootNode));
 144         }
 145
 146         explicit Octree(const OctreeNode& rootNode)
 147         {
 148                 tree_.insert(rootNode);
 149         }
 150
 151         OctreeNodeP insert(EntityP entity)
 152         {
 153                 return insert(entity, tree_.root());
 154         }
 155
 156         OctreeNodeP reinsert(EntityP entity, OctreeNodeP node);
 157
 158         void drawIfVisible(Scalar alpha, const Camera& cam)
 159         {
 160                 drawIfVisible(alpha, cam, tree_.root());
 161         }
 162
 163         void sort();
 164 };
 165
 166
 167 } // namespace Mf
 168
 169 #endif // _MOOF_OCTREE_HH_
 170
 171 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 172