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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:
+// System specific interface stuff.
+//
+//-----------------------------------------------------------------------------
+
+
+#ifndef __R_MAIN__
+#define __R_MAIN__
+
+#include "d_player.h"
+#include "r_data.h"
+
+
+
+
+//
+// POV related.
+//
+extern fixed_t viewcos;
+extern fixed_t viewsin;
+
+extern int viewwidth;
+extern int viewheight;
+extern int viewwindowx;
+extern int viewwindowy;
+
+
+
+extern int centerx;
+extern int centery;
+
+extern fixed_t centerxfrac;
+extern fixed_t centeryfrac;
+extern fixed_t projection;
+
+extern int validcount;
+
+extern int linecount;
+extern int loopcount;
+
+
+//
+// Lighting LUT.
+// Used for z-depth cuing per column/row,
+// and other lighting effects (sector ambient, flash).
+//
+
+// Lighting constants.
+// Now why not 32 levels here?
+#define LIGHTLEVELS 16
+#define LIGHTSEGSHIFT 4
+
+#define MAXLIGHTSCALE 48
+#define LIGHTSCALESHIFT 12
+#define MAXLIGHTZ 128
+#define LIGHTZSHIFT 20
+
+extern lighttable_t* scalelight[LIGHTLEVELS][MAXLIGHTSCALE];
+extern lighttable_t* scalelightfixed[MAXLIGHTSCALE];
+extern lighttable_t* zlight[LIGHTLEVELS][MAXLIGHTZ];
+
+extern int extralight;
+extern lighttable_t* fixedcolormap;
+
+
+// Number of diminishing brightness levels.
+// There a 0-31, i.e. 32 LUT in the COLORMAP lump.
+#define NUMCOLORMAPS 32
+
+
+// Blocky/low detail mode.
+//B remove this?
+// 0 = high, 1 = low
+extern int detailshift;
+
+
+//
+// Function pointers to switch refresh/drawing functions.
+// Used to select shadow mode etc.
+//
+extern void (*colfunc) (void);
+extern void (*transcolfunc) (void);
+extern void (*basecolfunc) (void);
+extern void (*fuzzcolfunc) (void);
+// No shadow effects on floors.
+extern void (*spanfunc) (void);
+
+
+//
+// Utility functions.
+int
+R_PointOnSide
+( fixed_t x,
+ fixed_t y,
+ node_t* node );
+
+int
+R_PointOnSegSide
+( fixed_t x,
+ fixed_t y,
+ seg_t* line );
+
+angle_t
+R_PointToAngle
+( fixed_t x,
+ fixed_t y );
+
+angle_t
+R_PointToAngle2
+( fixed_t x1,
+ fixed_t y1,
+ fixed_t x2,
+ fixed_t y2 );
+
+fixed_t
+R_PointToDist
+( fixed_t x,
+ fixed_t y );
+
+
+fixed_t R_ScaleFromGlobalAngle (angle_t visangle);
+
+subsector_t*
+R_PointInSubsector
+( fixed_t x,
+ fixed_t y );
+
+void
+R_AddPointToBox
+( int x,
+ int y,
+ fixed_t* box );
+
+
+
+//
+// REFRESH - the actual rendering functions.
+//
+
+// Called by G_Drawer.
+void R_RenderPlayerView (player_t *player);
+
+// Called by startup code.
+void R_Init (void);
+
+// Called by M_Responder.
+void R_SetViewSize (int blocks, int detail);
+
+#endif