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diff --git a/src/v_video.h b/src/v_video.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:
+ *  Gamma correction LUT.
+ *  Color range translation support
+ *  Functions to draw patches (by post) directly to screen.
+ *  Functions to blit a block to the screen.
+ *
+ *-----------------------------------------------------------------------------*/
+
+#ifndef __V_VIDEO__
+#define __V_VIDEO__
+
+#include "doomtype.h"
+#include "doomdef.h"
+// Needed because we are refering to patches.
+#include "r_data.h"
+
+//
+// VIDEO
+//
+
+#define CENTERY     (SCREENHEIGHT/2)
+
+// Screen 0 is the screen updated by I_Update screen.
+// Screen 1 is an extra buffer.
+
+// array of pointers to color translation tables
+extern const byte *colrngs[];
+
+// symbolic indices into color translation table pointer array
+typedef enum
+{
+  CR_BRICK,   //0
+  CR_TAN,     //1
+  CR_GRAY,    //2
+  CR_GREEN,   //3
+  CR_BROWN,   //4
+  CR_GOLD,    //5
+  CR_RED,     //6
+  CR_BLUE,    //7
+  CR_ORANGE,  //8
+  CR_YELLOW,  //9
+  CR_BLUE2,   //10 // proff
+  CR_LIMIT    //11 //jff 2/27/98 added for range check
+} crange_idx_e;
+//jff 1/16/98 end palette color range additions
+
+#define CR_DEFAULT CR_RED   /* default value for out of range colors */
+
+typedef struct {
+  byte *data;          // pointer to the screen content
+  boolean not_on_heap; // if set, no malloc or free is preformed and
+                       // data never set to NULL. Used i.e. with SDL doublebuffer.
+  int width;           // the width of the surface
+  int height;          // the height of the surface, used when mallocing
+  int byte_pitch;      // tha actual width of one line, used when mallocing
+  int short_pitch;     // tha actual width of one line, used when mallocing
+  int int_pitch;       // tha actual width of one line, used when mallocing
+} screeninfo_t;
+
+#define NUM_SCREENS 6
+extern screeninfo_t screens[NUM_SCREENS];
+extern int          usegamma;
+
+// Varying bit-depth support -POPE
+//
+// For bilinear filtering, each palette color is pre-weighted and put in a
+// table for fast blending operations. These macros decide how many weights
+// to create for each color. The lower the number, the lower the blend
+// accuracy, which can produce very bad artifacts in texture filtering.
+#define VID_NUMCOLORWEIGHTS 64
+#define VID_COLORWEIGHTMASK (VID_NUMCOLORWEIGHTS-1)
+#define VID_COLORWEIGHTBITS 6
+
+// Palettes for converting from 8 bit color to 16 and 32 bit. Also
+// contains the weighted versions of each palette color for filtering
+// operations
+extern unsigned short *V_Palette15;
+extern unsigned short *V_Palette16;
+extern unsigned int *V_Palette32;
+
+#define VID_PAL15(color, weight) V_Palette15[ (color)*VID_NUMCOLORWEIGHTS + (weight) ]
+#define VID_PAL16(color, weight) V_Palette16[ (color)*VID_NUMCOLORWEIGHTS + (weight) ]
+#define VID_PAL32(color, weight) V_Palette32[ (color)*VID_NUMCOLORWEIGHTS + (weight) ]
+
+// The available bit-depth modes
+typedef enum {
+  VID_MODE8,
+  VID_MODE15,
+  VID_MODE16,
+  VID_MODE32,
+  VID_MODEGL,
+  VID_MODEMAX
+} video_mode_t;
+
+extern const char *default_videomode;
+
+void V_InitMode(video_mode_t mode);
+
+// video mode query interface
+video_mode_t V_GetMode(void);
+int V_GetModePixelDepth(video_mode_t mode);
+int V_GetNumPixelBits(void);
+int V_GetPixelDepth(void);
+
+//jff 4/24/98 loads color translation lumps
+void V_InitColorTranslation(void);
+
+// Allocates buffer screens, call before R_Init.
+void V_Init (void);
+
+// V_CopyRect
+typedef void (*V_CopyRect_f)(int srcx,  int srcy,  int srcscrn,
+                             int width, int height,
+                             int destx, int desty, int destscrn,
+                             enum patch_translation_e flags);
+extern V_CopyRect_f V_CopyRect;
+
+// V_FillRect
+typedef void (*V_FillRect_f)(int scrn, int x, int y,
+                             int width, int height, byte colour);
+extern V_FillRect_f V_FillRect;
+
+// CPhipps - patch drawing
+// Consolidated into the 3 really useful functions:
+
+// V_DrawNumPatch - Draws the patch from lump num
+typedef void (*V_DrawNumPatch_f)(int x, int y, int scrn,
+                                 int lump, int cm,
+                                 enum patch_translation_e flags);
+extern V_DrawNumPatch_f V_DrawNumPatch;
+
+// V_DrawNamePatch - Draws the patch from lump "name"
+#define V_DrawNamePatch(x,y,s,n,t,f) V_DrawNumPatch(x,y,s,W_GetNumForName(n),t,f)
+
+/* cph -
+ * Functions to return width & height of a patch.
+ * Doesn't really belong here, but is often used in conjunction with
+ * this code.
+ */
+#define V_NamePatchWidth(name) R_NumPatchWidth(W_GetNumForName(name))
+#define V_NamePatchHeight(name) R_NumPatchHeight(W_GetNumForName(name))
+
+/* cphipps 10/99: function to tile a flat over the screen */
+typedef void (*V_DrawBackground_f)(const char* flatname, int scrn);
+extern V_DrawBackground_f V_DrawBackground;
+
+void V_DestroyUnusedTrueColorPalettes(void);
+// CPhipps - function to set the palette to palette number pal.
+void V_SetPalette(int pal);
+
+// CPhipps - function to plot a pixel
+
+// V_PlotPixel
+typedef void (*V_PlotPixel_f)(int,int,int,byte);
+extern V_PlotPixel_f V_PlotPixel;
+
+typedef struct
+{
+  int x, y;
+} fpoint_t;
+
+typedef struct
+{
+  fpoint_t a, b;
+} fline_t;
+
+// V_DrawLine
+typedef void (*V_DrawLine_f)(fline_t* fl, int color);
+extern V_DrawLine_f V_DrawLine;
+
+void V_AllocScreen(screeninfo_t *scrn);
+void V_AllocScreens();
+void V_FreeScreen(screeninfo_t *scrn);
+void V_FreeScreens();
+
+#ifdef GL_DOOM
+#include "gl_struct.h"
+#endif
+#endif