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diff --git a/src/r_things.h b/src/r_things.h
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+/* Emacs style mode select   -*- C++ -*-
+ *-----------------------------------------------------------------------------
+ *
+ *
+ *  PrBoom: a Doom port merged with LxDoom and LSDLDoom
+ *  based on BOOM, a modified and improved DOOM engine
+ *  Copyright (C) 1999 by
+ *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
+ *  Copyright (C) 1999-2000 by
+ *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
+ *  Copyright 2005, 2006 by
+ *  Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
+ *
+ *  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:
+ *      Rendering of moving objects, sprites.
+ *
+ *-----------------------------------------------------------------------------*/
+
+#ifndef __R_THINGS__
+#define __R_THINGS__
+
+#ifdef __GNUG__
+#pragma interface
+#endif
+
+#include "r_draw.h"
+
+/* Constant arrays used for psprite clipping and initializing clipping. */
+
+extern int negonearray[MAX_SCREENWIDTH];       /* killough 2/8/98: */ // dropoff overflow
+extern int screenheightarray[MAX_SCREENWIDTH]; /* change to MAX_*  */ // dropoff overflow
+
+/* Vars for R_DrawMaskedColumn */
+
+extern int     *mfloorclip;    // dropoff overflow
+extern int     *mceilingclip;  // dropoff overflow
+extern fixed_t spryscale;
+extern fixed_t sprtopscreen;
+extern fixed_t pspritescale;
+extern fixed_t pspriteiscale;
+/* proff 11/06/98: Added for high-res */
+extern fixed_t pspriteyscale;
+
+void R_DrawMaskedColumn(const rpatch_t *patch,
+                        R_DrawColumn_f colfunc,
+                        draw_column_vars_t *dcvars,
+                        const rcolumn_t *column,
+                        const rcolumn_t *prevcolumn,
+                        const rcolumn_t *nextcolumn);
+void R_SortVisSprites(void);
+void R_AddSprites(subsector_t* subsec, int lightlevel);
+void R_DrawPlayerSprites(void);
+void R_InitSprites(const char * const * namelist);
+void R_ClearSprites(void);
+void R_DrawMasked(void);
+
+#endif