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diff --git a/src/r_draw.h b/src/r_draw.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:
+ *      System specific interface stuff.
+ *
+ *-----------------------------------------------------------------------------*/
+
+#ifndef __R_DRAW__
+#define __R_DRAW__
+
+#include "r_defs.h"
+
+#ifdef __GNUG__
+#pragma interface
+#endif
+
+enum column_pipeline_e {
+  RDC_PIPELINE_STANDARD,
+  RDC_PIPELINE_TRANSLUCENT,
+  RDC_PIPELINE_TRANSLATED,
+  RDC_PIPELINE_FUZZ,
+  RDC_PIPELINE_MAXPIPELINES,
+};
+
+// Used to specify what kind of filering you want
+enum draw_filter_type_e {
+  RDRAW_FILTER_NONE,
+  RDRAW_FILTER_POINT,
+  RDRAW_FILTER_LINEAR,
+  RDRAW_FILTER_ROUNDED,
+  RDRAW_FILTER_MAXFILTERS
+};
+
+// Used to specify what kind of column edge rendering to use on masked 
+// columns. SQUARE = standard, SLOPED = slope the column edge up or down
+// based on neighboring columns
+enum sloped_edge_type_e {
+  RDRAW_MASKEDCOLUMNEDGE_SQUARE,
+  RDRAW_MASKEDCOLUMNEDGE_SLOPED
+};
+
+// Packaged into a struct - POPE
+typedef struct {
+  int                 x;
+  int                 yl;
+  int                 yh;
+  fixed_t             z; // the current column z coord
+  fixed_t             iscale;
+  fixed_t             texturemid;
+  int                 texheight;    // killough
+  fixed_t             texu; // the current column u coord
+  const byte          *source; // first pixel in a column
+  const byte          *prevsource; // first pixel in previous column
+  const byte          *nextsource; // first pixel in next column
+  const lighttable_t  *colormap;
+  const lighttable_t  *nextcolormap;
+  const byte          *translation;
+  int                 edgeslope; // OR'ed RDRAW_EDGESLOPE_*
+  // 1 if R_DrawColumn* is currently drawing a masked column, otherwise 0
+  int                 drawingmasked;
+  enum sloped_edge_type_e edgetype;
+} draw_column_vars_t;
+
+void R_SetDefaultDrawColumnVars(draw_column_vars_t *dcvars);
+
+void R_VideoErase(int x, int y, int count);
+
+typedef struct {
+  int                 y;
+  int                 x1;
+  int                 x2;
+  fixed_t             z; // the current span z coord
+  fixed_t             xfrac;
+  fixed_t             yfrac;
+  fixed_t             xstep;
+  fixed_t             ystep;
+  const byte          *source; // start of a 64*64 tile image
+  const lighttable_t  *colormap;
+  const lighttable_t  *nextcolormap;
+} draw_span_vars_t;
+
+typedef struct {
+  byte           *byte_topleft;
+  unsigned short *short_topleft;
+  unsigned int   *int_topleft;
+  int   byte_pitch;
+  int   short_pitch;
+  int   int_pitch;
+
+  enum draw_filter_type_e filterwall;
+  enum draw_filter_type_e filterfloor;
+  enum draw_filter_type_e filtersprite;
+  enum draw_filter_type_e filterz;
+  enum draw_filter_type_e filterpatch;
+
+  enum sloped_edge_type_e sprite_edges;
+  enum sloped_edge_type_e patch_edges;
+
+  // Used to specify an early-out magnification threshold for filtering.
+  // If a texture is being minified (dcvars.iscale > rdraw_magThresh), then it
+  // drops back to point filtering.
+  fixed_t mag_threshold;
+} draw_vars_t;
+
+extern draw_vars_t drawvars;
+
+extern byte playernumtotrans[MAXPLAYERS]; // CPhipps - what translation table for what player
+extern byte       *translationtables;
+
+typedef void (*R_DrawColumn_f)(draw_column_vars_t *dcvars);
+R_DrawColumn_f R_GetDrawColumnFunc(enum column_pipeline_e type,
+                                   enum draw_filter_type_e filter,
+                                   enum draw_filter_type_e filterz);
+
+// Span blitting for rows, floor/ceiling. No Spectre effect needed.
+typedef void (*R_DrawSpan_f)(draw_span_vars_t *dsvars);
+R_DrawSpan_f R_GetDrawSpanFunc(enum draw_filter_type_e filter,
+                               enum draw_filter_type_e filterz);
+void R_DrawSpan(draw_span_vars_t *dsvars);
+
+void R_InitBuffer(int width, int height);
+
+// Initialize color translation tables, for player rendering etc.
+void R_InitTranslationTables(void);
+
+// Rendering function.
+void R_FillBackScreen(void);
+
+// If the view size is not full screen, draws a border around it.
+void R_DrawViewBorder(void);
+
+// haleyjd 09/13/04: new function to call from main rendering loop
+// which gets rid of the unnecessary reset of various variables during
+// column drawing.
+void R_ResetColumnBuffer(void);
+
+#endif