shithub: nanobsp

ref: 35fc4078cabb6cb183b38e693a560b67681c061d
dir: /nano_bsp.c/

//----------------------------------------------------------------------------
//
//  Copyright (c) 2023  Andrew Apted
//
//  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.
//
//----------------------------------------------------------------------------

#include "i_system.h"

#include <stdlib.h>
#include <assert.h>

#include "doomtype.h"
#include "doomstat.h"
#include "d_ticcmd.h"
#include "d_event.h"
#include "m_fixed.h"
#include "m_bbox.h"
#include "m_misc.h"
#include "m_random.h"
#include "z_zone.h"

#include "p_local.h"
#include "p_mobj.h"

#include "nano_bsp.h"


#undef MAX
#define MAX(a, b)  ((a) > (b) ? (a) : (b))

#undef MIN
#define MIN(a, b)  ((a) < (b) ? (a) : (b))

// #define DIST_EPSILON  (1.0 / 256.0)


vertex_t * BSP_NewVertex (void)
{
	vertex_t * vert = Z_Malloc(sizeof(vertex_t), PU_LEVEL, NULL);
	return vert;
}


seg_t * BSP_NewSeg (void)
{
	seg_t * seg = Z_Malloc (sizeof(seg_t), PU_LEVEL, NULL);
	memset (seg, 0, sizeof(*seg));
	return seg;
}


//----------------------------------------------------------------------------

void BSP_SegForLineSide (int i, int side, seg_t ** list_var)
{
	line_t * ld = &lines[i];

	if (ld->sidenum[side] < 0)
		return;

	// create the seg
	seg_t * seg = BSP_NewSeg ();

	seg->v1 = side ? ld->v2 : ld->v1;
	seg->v2 = side ? ld->v1 : ld->v2;

	seg->offset = 0;
	seg->angle  = R_PointToAngle2 (seg->v1->x, seg->v1->y, seg->v2->x, seg->v2->y);

	seg->sidedef = &sides[ld->sidenum[side]];
	seg->linedef = ld;

	seg->frontsector = side ? ld->backsector  : ld->frontsector;
	seg->backsector  = side ? ld->frontsector : ld->backsector;

	// link into the list
	seg->next   = (*list_var);
	(*list_var) = seg;
}


seg_t * BSP_CreateSegs (void)
{
	seg_t * list = NULL;

	int i;
	for (i = 0 ; i < numlines ; i++)
	{
		BSP_SegForLineSide (i, 0, &list);
		BSP_SegForLineSide (i, 1, &list);
	}

	return list;
}


//----------------------------------------------------------------------------

void Nano_BuildBSP (void)
{
	seg_t * list = BSP_CreateSegs ();

	// TODO
}