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diff --git a/src/i_video.h b/src/i_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:
+ *      System specific interface stuff.
+ *
+ *-----------------------------------------------------------------------------*/
+
+#ifndef __I_VIDEO__
+#define __I_VIDEO__
+
+#include "doomtype.h"
+#include "v_video.h"
+
+#ifdef __GNUG__
+#pragma interface
+#endif
+
+void I_PreInitGraphics(void); /* CPhipps - do stuff immediately on start */
+void I_CalculateRes(unsigned int width, unsigned int height); /* calculate resolution */
+void I_SetRes(void); /* set resolution */
+void I_InitGraphics (void);
+void I_UpdateVideoMode(void);
+void I_ShutdownGraphics(void);
+
+/* Takes full 8 bit values. */
+void I_SetPalette(int pal); /* CPhipps - pass down palette number */
+
+void I_UpdateNoBlit (void);
+void I_FinishUpdate (void);
+
+int I_ScreenShot (const char *fname);
+
+/* I_StartTic
+ * Called by D_DoomLoop,
+ * called before processing each tic in a frame.
+ * Quick syncronous operations are performed here.
+ * Can call D_PostEvent.
+ */
+void I_StartTic (void);
+
+/* I_StartFrame
+ * Called by D_DoomLoop,
+ * called before processing any tics in a frame
+ * (just after displaying a frame).
+ * Time consuming syncronous operations
+ * are performed here (joystick reading).
+ * Can call D_PostEvent.
+ */
+
+void I_StartFrame (void);
+
+extern int use_doublebuffer;  /* proff 2001-7-4 - controls wether to use doublebuffering*/
+extern int use_fullscreen;  /* proff 21/05/2000 */
+extern int desired_fullscreen; //e6y
+
+#endif