// Emacs style mode select   -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// DESCRIPTION:
//      Refresh, visplane stuff (floor, ceilings).
//
//-----------------------------------------------------------------------------


#ifndef __R_PLANE__
#define __R_PLANE__


#include "r_data.h"

#ifdef __GNUG__
#pragma interface
#endif


// Visplane related.
extern  short*          lastopening;


typedef void (*planefunction_t) (int top, int bottom);

extern planefunction_t  floorfunc;
extern planefunction_t  ceilingfunc_t;

extern short            floorclip[MAXSCREENWIDTH];
extern short            ceilingclip[MAXSCREENWIDTH];

extern fixed_t          yslope[MAXSCREENHEIGHT];
extern fixed_t          distscale[MAXSCREENWIDTH];

void R_InitPlanes (void);
void R_ClearPlanes (void);

void
R_MapPlane
( int           y,
  int           x1,
  int           x2 );

void
R_MakeSpans
( int           x,
  int           t1,
  int           b1,
  int           t2,
  int           b2 );

void R_DrawPlanes (void);

visplane_t*
R_FindPlane
( fixed_t       height,
  int           picnum,
  int           lightlevel );

visplane_t*
R_CheckPlane
( visplane_t*   pl,
  int           start,
  int           stop );



#endif
//-----------------------------------------------------------------------------
//
// $Log:$
//
//-----------------------------------------------------------------------------
