plane: add trivial plane type

Makefile.am

@@ -113,6 +113,8 @@ UTIL_FILES   =		\
     options.hpp		\
     pascal.cpp		\
     pascal.hpp		\
+    plane.cpp		\
+    plane.hpp		\
     platform.hpp	\
     point.cpp		\
     point.hpp		\

plane.cpp

@@ -0,0 +1,38 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * libgim is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libgim.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2015 Danny Robson <danny@nerdcruft.net>
+ */
+
+
+#include "plane.hpp"
+
+#include "debug.hpp"
+
+//-----------------------------------------------------------------------------
+template <size_t S, typename T>
+util::plane<S,T>::plane (util::point<S,T> _p,
+                         util::vector<S,T> _n):
+    p (_p),
+    n (_n)
+{
+    CHECK_EQ (n.magnitude2 (), 1);
+}
+
+
+//-----------------------------------------------------------------------------
+template struct util::plane<2,float>;
+template struct util::plane<3,float>;

plane.hpp

@@ -0,0 +1,41 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * libgim is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libgim.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2015 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifndef __UTIL_PLANE_HPP
+#define __UTIL_PLANE_HPP
+
+#include "point.hpp"
+#include "vector.hpp"
+
+namespace util {
+    template <size_t S, typename T>
+    struct plane {
+        plane (util::point<S,T> p,
+               util::vector<S,T> n);
+
+        util::point<S,T> p;
+        util::vector<S,T> n;
+    };
+
+
+    typedef plane<2,float> plane2f;
+    typedef plane<3,float> plane3f;
+}
+
+#endif