//
//  Copyright (C) 1999 by
//  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
//
//  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.
//
// DESCRIPTION:
//      Refresh, visplane stuff (floor, ceilings).
//
//-----------------------------------------------------------------------------

#ifndef __R_PLANE__
#define __R_PLANE__

#include "r_data.h"

// killough 10/98: special mask indicates sky flat comes from sidedef
#define PL_SKYFLAT (0x80000000)

// Visplane related.
extern  int *lastopening; // [FG] 32-bit integer math

extern int floorclip[], ceilingclip[]; // [FG] 32-bit integer math
extern fixed_t *yslope, yslopes[LOOKDIRS][MAX_SCREENHEIGHT], distscale[];

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

visplane_t *R_FindPlane(
                        fixed_t height, 
                        int picnum,
                        int lightlevel,
                        fixed_t xoffs,  // killough 2/28/98: add x-y offsets
                        fixed_t yoffs
                       );

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

// cph 2003/04/18 - create duplicate of existing visplane and set initial range
visplane_t *R_DupPlane(const visplane_t *pl, int start, int stop);

#endif

//----------------------------------------------------------------------------
//
// $Log: r_plane.h,v $
// Revision 1.6  1998/04/27  01:48:34  killough
// Program beautification
//
// Revision 1.5  1998/03/02  11:47:16  killough
// Add support for general flats xy offsets
//
// Revision 1.4  1998/02/09  03:16:06  killough
// Change arrays to use MAX height/width
//
// Revision 1.3  1998/02/02  14:20:45  killough
// Made some functions static
//
// Revision 1.2  1998/01/26  19:27:42  phares
// First rev with no ^Ms
//
// Revision 1.1.1.1  1998/01/19  14:03:03  rand
// Lee's Jan 19 sources
//
//
//----------------------------------------------------------------------------
