1 files changed, 132 insertions, 0 deletions
diff --git a/BSPTree.h b/BSPTree.h
new file mode 100644
index 0000000..c005507
--- /dev/null
+++ b/BSPTree.h
@@ -0,0 +1,132 @@
+#ifndef _BSPTREE_H_
+#define _BSPTREE_H_
+
+#include "Triangle.h"
+#include <list>
+#include <cmath>
+#include <vmmlib/vector.hpp>
+
+class BSPTree {
+  private:
+    class Plane {
+      public:
+        Plane() : d(0) {}
+        Plane(const vmml::vec3f &n, float d0) : normal(n), d(d0) {}
+        Plane(const Triangle &t) : normal(t.getNormal()), d(t.getVertex(0).dot(normal)) {}
+
+        bool contains(const vmml::vec3f &v) const {
+          return (fabsf(normal.dot(v) - d) < 1E-6);
+        }
+
+        bool isBehind(const vmml::vec3f &v) const {
+          return (normal.dot(v) - d) < 0;
+        }
+
+        bool isInFront(const vmml::vec3f &v) const {
+          return (normal.dot(v) - d) > 0;
+        }
+
+
+        bool contains(const Triangle &t) const {
+          for(int i = 0; i < 3; ++i) {
+            if(!contains(t.getVertex(i)))
+              return false;
+          }
+
+          return true;
+        }
+
+        bool isBehind(const Triangle &t) const {
+          for(int i = 0; i < 3; ++i) {
+            if(!isBehind(t.getVertex(i)) && !contains(t.getVertex(i)))
+              return false;
+          }
+
+          return true;
+        }
+
+        bool isInFront(const Triangle &t) const {
+          for(int i = 0; i < 3; ++i) {
+            if(!isInFront(t.getVertex(i)) && !contains(t.getVertex(i)))
+              return false;
+          }
+
+          return true;
+        }
+
+
+        const vmml::vec3f& getNormal() const {
+          return normal;
+        }
+
+        vmml::vec3f intersection(const vmml::vec3f &p, const vmml::vec3f &dir) const;
+        void partition(const Triangle &t, std::list<Triangle> *front, std::list<Triangle> *back) const;
+
+      private:
+        vmml::vec3f normal;
+        float d;
+    };
+
+  public:
+    BSPTree(const std::list<Triangle> &triangles);
+
+    BSPTree(const BSPTree &tree) : frontTree(0), backTree(0) {
+      *this = tree;
+    }
+
+    virtual ~BSPTree() {
+      if(frontTree)
+        delete frontTree;
+
+      if(backTree)
+        delete backTree;
+    }
+
+    BSPTree& operator=(const BSPTree &tree);
+
+    template<typename T>
+    void visit(const T& visitor, const vmml::vec3f &p) {
+      doVisit<const T>(visitor, p);
+    }
+
+    template<typename T>
+    void visit(T& visitor, const vmml::vec3f &p) {
+      doVisit(visitor, p);
+    }
+
+  private:
+    Plane plane;
+    std::list<Triangle> triangles;
+    BSPTree *frontTree, *backTree;
+
+    template<typename T>
+    void doVisit(T& visitor, const vmml::vec3f &p) {
+      if(plane.isBehind(p)) {
+        if(frontTree)
+          frontTree->visit(visitor, p);
+
+        for(std::list<Triangle>::iterator t = triangles.begin(); t != triangles.end(); ++t) {
+          visitor(*t);
+        }
+
+        if(backTree)
+          backTree->visit(visitor, p);
+      }
+      else {
+        if(backTree)
+          backTree->visit(visitor, p);
+
+        for(std::list<Triangle>::iterator t = triangles.begin(); t != triangles.end(); ++t) {
+          visitor(*t);
+        }
+
+        if(frontTree)
+          frontTree->visit(visitor, p);
+      }
+    }
+
+    static vmml::vec3f findCenter(const std::list<Triangle> &triangles);
+    static const Triangle* findNearestTriangle(const std::list<Triangle> &triangles, const vmml::vec3f &v);
+};
+
+#endif /* _BSPTREE_H_ */