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+// Emacs style mode select -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 1993-1996 Id Software, Inc.
+// Copyright(C) 2005 Simon Howard
+//
+// This program 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 2
+// of the License, or (at your option) any later version.
+//
+// This program 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 this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+// DESCRIPTION:
+// Refresh module, BSP traversal and handling.
+//
+//-----------------------------------------------------------------------------
+
+
+#ifndef __R_BSP__
+#define __R_BSP__
+
+
+
+extern seg_t* curline;
+extern side_t* sidedef;
+extern line_t* linedef;
+extern sector_t* frontsector;
+extern sector_t* backsector;
+
+extern int rw_x;
+extern int rw_stopx;
+
+extern boolean segtextured;
+
+// false if the back side is the same plane
+extern boolean markfloor;
+extern boolean markceiling;
+
+extern boolean skymap;
+
+extern drawseg_t drawsegs[MAXDRAWSEGS];
+extern drawseg_t* ds_p;
+
+extern lighttable_t** hscalelight;
+extern lighttable_t** vscalelight;
+extern lighttable_t** dscalelight;
+
+
+typedef void (*drawfunc_t) (int start, int stop);
+
+
+// BSP?
+void R_ClearClipSegs (void);
+void R_ClearDrawSegs (void);
+
+
+void R_RenderBSPNode (int bspnum);
+
+
+#endif