// 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 module, BSP traversal and handling.
//
//-----------------------------------------------------------------------------


#ifndef __R_BSP__
#define __R_BSP__

#include "tarray.h"
#include <stddef.h>
#include "r_defs.h"

EXTERN_CVAR (Bool, r_drawflat)		// [RH] Don't texture segs?

namespace swrenderer
{

// The 3072 below is just an arbitrary value picked to avoid
// drawing lines the player is too close to that would overflow
// the texture calculations.
#define TOO_CLOSE_Z (3072.0 / (1<<12))

struct FWallCoords
{
	FVector2	tleft;		// coords at left of wall in view space				rx1,ry1
	FVector2	tright;		// coords at right of wall in view space			rx2,ry2

	float		sz1, sz2;	// depth at left, right of wall in screen space		yb1,yb2
	short		sx1, sx2;	// x coords at left, right of wall in screen space	xb1,xb2

	bool Init(const DVector2 &pt1, const DVector2 &pt2, double too_close);
};

struct FWallTmapVals
{
	float		UoverZorg, UoverZstep;
	float		InvZorg, InvZstep;

	void InitFromWallCoords(const FWallCoords *wallc);
	void InitFromLine(const DVector2 &left, const DVector2 &right);
};

extern FWallCoords WallC;
extern FWallTmapVals WallT;

enum
{
	FAKED_Center,
	FAKED_BelowFloor,
	FAKED_AboveCeiling
};

extern seg_t*		curline;
extern side_t*		sidedef;
extern line_t*		linedef;
extern sector_t*	frontsector;
extern sector_t*	backsector;

extern int			WindowLeft, WindowRight;
extern WORD			MirrorFlags;

typedef void (*drawfunc_t) (int start, int stop);

void R_RenderBSPNode (void *node);

// killough 4/13/98: fake floors/ceilings for deep water / fake ceilings:
sector_t *R_FakeFlat(sector_t *, sector_t *, int *, int *, bool);

}

#endif