//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 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.
//
// DESCRIPTION:
//	Refresh, visplane stuff (floor, ceilings).
//

#ifndef __R_PLANE__
#define __R_PLANE__

#include "i_video.h"
#include "m_fixed.h"
#include "r_defs.h"

// 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[SCREENWIDTH];
extern short ceilingclip[SCREENWIDTH];

extern fixed_t yslope[SCREENHEIGHT];
extern fixed_t distscale[SCREENWIDTH];

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