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- /* saveconnect.m */
-
- #include "idbsp.h"
-
- typedef struct
- {
- int x,
- y;
- }
-
- bpoint_t;
-
- typedef struct
- {
- int xl,
- xh,
- yl,
- yh;
- }
-
- bbox_t;
-
- typedef struct
- {
- bpoint_t p1,
- p2;
- }
- bline_t;
-
- typedef struct
- {
- int numpoints;
- bbox_t bounds;
- bpoint_t *points;
- }
-
- bchain_t;
-
- typedef struct
- {
- int x,
- y;
- int dx,
- dy;
- }
-
- bdivline_t;
-
-
- /* [numsec][numsec] array */
- byte *connections;
-
- int numblines;
- bline_t *blines;
-
- int numsectors;
- bbox_t *secboxes;
-
- int numbchains;
- bchain_t *bchains;
-
- void ClearBBox(bbox_t * box)
- {
- box -> xl = box -> yl = INT_MAX;
- box -> xh = box -> yh = INT_MIN;
- }
-
- void AddToBBox(bbox_t * box, int x, int y)
- {
- if (x < box -> xl)
- box -> xl = x;
- if (x > box -> xh)
- box -> xh = x;
- if (y < box -> yl)
- box -> yl = y;
- if (y > box -> yh)
- box -> yh = y;
- }
-
-
- /*
- ==================
- =
- = BPointOnSide
- =
- = Returns side 0 (front), 1 (back), or -1 (colinear)
- ==================
- */
-
- int BPointOnSide(bpoint_t * pt, bdivline_t * l)
- {
- int dx,
- dy;
- int left,
- right;
-
- if (!l -> dx)
- {
- if (pt -> x < l -> x)
- return l -> dy > 0;
- return l -> dy < 0;
- }
- if (!l -> dy)
- {
- if (pt -> y < l -> y)
- return l -> dx < 0;
- return l -> dx > 0;
- }
-
-
- dx = pt -> x - l -> x;
- dy = pt -> y - l -> y;
-
- left = l -> dy * dx;
- right = dy * l -> dx;
-
- if (right < left)
- return 0; /* front side */
- return 1; /* back side */
- }
-
-
- void DrawBBox(bbox_t * box)
- {
- /*
- PSmoveto (box->xl,box->yl);
- PSlineto (box->xh,box->yl);
- PSlineto (box->xh,box->yh);
- PSlineto (box->xl,box->yh);
- PSlineto (box->xl,box->yl);
- PSstroke ();
- NXPing ();
- */
- }
-
- void DrawDivline(bdivline_t * li)
- {
- /*
- PSmoveto (li->x,li->y);
- PSrlineto (li->dx,li->dy);
- PSstroke ();
- NXPing ();
- */
- }
-
- void DrawBChain(bchain_t * ch)
- {
- /*
- int i;
-
- PSmoveto (ch->points->x,ch->points->y);
- for (i=1 ; i<ch->numpoints ; i++)
- PSlineto (ch->points[i].x,ch->points[i].y);
- PSstroke ();
- NXPing ();
- */
- }
-
-
- bdivline_t ends[2],
- sides[2];
- int end0out,
- end1out,
- side0out,
- side1out;
- bbox_t sweptarea;
-
-
- /*
- ====================
- =
- = DoesChainBlock
- =
- ====================
- */
-
- boolean DoesChainBlock(bchain_t * chain)
- {
- /*
-
- if a solid line can be walked from one side to the other without going out
- an end, the path is blocked
-
- */
-
- bpoint_t *pt;
- int side,
- startside;
- int p;
-
- /* don't check if bounds don't intersect */
-
- if (sweptarea.xl > chain -> bounds.xh || sweptarea.xh < chain -> bounds.xl ||
- sweptarea.yl > chain -> bounds.yh || sweptarea.yh < chain -> bounds.yl)
- return false;
-
- startside = -1; /* not started yet */
-
- for (p = 0, pt = chain -> points; p < chain -> numpoints; p++, pt++)
- {
- /* find side for pt */
-
- #if 0
- if (p > 0)
- {
- PSmoveto((pt - 1) -> x, (pt - 1) -> y);
- PSlineto(pt -> x, pt -> y);
- PSstroke();
- NXPing();
- }
- #endif
-
- if (BPointOnSide(pt, &ends[0]) == end0out)
- {
- startside = -1; /* off end */
- continue;
- }
- if (BPointOnSide(pt, &ends[1]) == end1out)
- {
- startside = -1; /* off end */
- continue;
- }
- if (BPointOnSide(pt, &sides[0]) == side0out)
- side = 0;
- else if (BPointOnSide(pt, &sides[1]) == side1out)
- side = 1;
- else
- continue; /* in middle */
-
- /* point is on one side or the other */
- if (startside == -1 || startside == side)
- {
- startside = side;
- continue;
- }
-
- /* opposite of startside */
- return true; /* totally crossed area */
-
- }
-
- return false;
- }
-
- /*
- ====================
- =
- = BuildConnections
- =
- ====================
- */
-
- enum
- {
- si_north, si_east, si_south, si_west
- };
-
- void BuildConnections(void)
- {
- int blockcount,
- passcount;
- int i,
- j,
- k,
- s,
- bn;
- int x,
- y;
- bbox_t *bbox[2];
- int walls[4];
- bpoint_t points[2][2];
-
- /* look for obscured sectors */
- blockcount = passcount = 0;
- bbox[0] = secboxes;
- printf("\n");
- for (i = 0; i < numsectors - 1; i++, bbox[0]++)
- {
- printf("connection #%d of %d\r", i, numsectors - 1);
- bbox[1] = bbox[0] + 1;
- if (bbox[0] -> xh - bbox[0] -> xl < 64 || bbox[0] -> yh - bbox[0] -> yl < 64)
- { /* don't bother with small sectors (stairs, doorways, etc) */
- continue;
- }
-
- for (j = i + 1; j < numsectors; j++, bbox[1]++)
- {
- if (bbox[1] -> xh - bbox[1] -> xl < 64 || bbox[1] -> yh - bbox[1] -> yl < 64)
- { /* don't bother with small sectors (stairs, doorways, etc) */
- continue;
- }
- if (bbox[1] -> xl <= bbox[0] -> xh && bbox[1] -> xh >= bbox[0] -> xl &&
- bbox[1] -> yl <= bbox[0] -> yh && bbox[1] -> yh >= bbox[0] -> yl)
- { /* touching sectors are never blocked */
- passcount++;
- continue;
- }
-
- sweptarea.xl = bbox[0] -> xl < bbox[1] -> xl ? bbox[0] -> xl : bbox[1] -> xl;
- sweptarea.xh = bbox[0] -> xh > bbox[1] -> xh ? bbox[0] -> xh : bbox[1] -> xh;
- sweptarea.yl = bbox[0] -> yl < bbox[1] -> yl ? bbox[0] -> yl : bbox[1] -> yl;
- sweptarea.yh = bbox[0] -> yh > bbox[1] -> yh ? bbox[0] -> yh : bbox[1] -> yh;
-
- /*
- calculate the swept area between the sectors
- */
- for (bn = 0; bn < 2; bn++)
- {
- memset(walls, 0, sizeof(walls));
- if (bbox[bn] -> xl <= bbox[!bn] -> xl)
- walls[si_west] = 1;
- if (bbox[bn] -> xh >= bbox[!bn] -> xh)
- walls[si_east] = 1;
- if (bbox[bn] -> yl <= bbox[!bn] -> yl)
- walls[si_south] = 1;
- if (bbox[bn] -> yh >= bbox[!bn] -> yh)
- walls[si_north] = 1;
-
- for (s = 0; s < 5; s++)
- {
- switch (s & 3)
- {
- case si_north:
- x = bbox[bn] -> xl;
- y = bbox[bn] -> yh;
- break;
- case si_east:
- x = bbox[bn] -> xh;
- y = bbox[bn] -> yh;
- break;
- case si_south:
- x = bbox[bn] -> xh;
- y = bbox[bn] -> yl;
- break;
- case si_west:
- x = bbox[bn] -> xl;
- y = bbox[bn] -> yl;
- break;
- }
- if (!walls[(s - 1) & 3] && walls[s & 3])
- {
- points[bn][0].x = x;
- points[bn][0].y = y;
- }
- if (walls[(s - 1) & 3] && !walls[s & 3])
- {
- points[bn][1].x = x;
- points[bn][1].y = y;
- }
- }
-
- ends[bn].x = points[bn][0].x;
- ends[bn].y = points[bn][0].y;
- ends[bn].dx = points[bn][1].x - points[bn][0].x;
- ends[bn].dy = points[bn][1].y - points[bn][0].y;
- }
-
- sides[0].x = points[0][0].x;
- sides[0].y = points[0][0].y;
- sides[0].dx = points[1][1].x - points[0][0].x;
- sides[0].dy = points[1][1].y - points[0][0].y;
-
- sides[1].x = points[0][1].x;
- sides[1].y = points[0][1].y;
- sides[1].dx = points[1][0].x - points[0][1].x;
- sides[1].dy = points[1][0].y - points[0][1].y;
-
- end0out = !BPointOnSide(&points[1][0], &ends[0]);
- end1out = !BPointOnSide(&points[0][0], &ends[1]);
- side0out = !BPointOnSide(&points[0][1], &sides[0]);
- side1out = !BPointOnSide(&points[0][0], &sides[1]);
-
- /*
- look for a line change that covers the swept area
- */
- for (k = 0; k < numbchains; k++)
- {
- if (!DoesChainBlock(&bchains[k]))
- continue;
- blockcount++;
- connections[i * numsectors + j] = connections[j * numsectors + i] = 1;
- /*
- if (draw)
- {
- EraseWindow ();
- DrawBBox (bbox[0]);
- DrawBBox (bbox[1]);
- DrawDivline (&ends[0]);
- DrawDivline (&ends[1]);
- DrawDivline (&sides[0]);
- DrawDivline (&sides[1]);
- DrawBChain (&bchains[k]);
- }
- */
- goto blocked;
- }
-
- /* nothing definately blocked the path */
- passcount++;
- blocked:;
- }
- }
- printf("passcount: %i\nblockcount: %i\n", passcount, blockcount);
- }
-
-
- /*
- ====================
- =
- = BuildBlockingChains
- =
- ====================
- */
-
- void BuildBlockingChains(void)
- {
- boolean *used;
- int i,
- j;
- bpoint_t *temppoints,
- *pt_p;
- bline_t *li1,
- *li2;
-
- /* id chains_i; */
- STORAGE *chains_i;
- bchain_t bch;
- int cx,
- cy;
-
- used = alloca(numblines * sizeof(*used));
- memset(used, 0, numblines * sizeof(*used));
- temppoints = alloca(numblines * sizeof(*temppoints));
- /*
- chains_i = [[Storage alloc]
- initCount: 0
- elementSize: sizeof(bchain_t)
- description: NULL];
- */
- chains_i = (STORAGE *) SafeMalloc(sizeof(STORAGE));
- chains_i -> data = (bchain_t *) SafeMalloc(sizeof(bchain_t));
- chains_i -> count = 0;
- chains_i -> size = sizeof(bchain_t);
-
- printf("\n");
- li1 = blines;
- for (i = 0; i < numblines; i++, li1++)
- {
- printf("bline #%d of %d\r", i, numblines);
- if (used[i])
- continue;
- used[i] = true;
-
- /* start a new chain */
- pt_p = temppoints;
- pt_p -> x = li1 -> p1.x;
- pt_p -> y = li1 -> p1.y;
- pt_p++;
- pt_p -> x = cx = li1 -> p2.x;
- pt_p -> y = cy = li1 -> p2.y;
- pt_p++;
-
- ClearBBox(&bch.bounds);
- AddToBBox(&bch.bounds, li1 -> p1.x, li1 -> p1.y);
- AddToBBox(&bch.bounds, cx, cy);
-
- /* look for connected lines */
- do
- {
- li2 = li1 + 1;
- for (j = i + 1; j < numblines; j++, li2++)
- if (!used[j] && li2 -> p1.x == cx && li2 -> p1.y == cy)
- break;
-
- if (j == numblines)
- break; /* no more lines in chain */
-
- /* add to chain */
- used[j] = true;
- pt_p -> x = cx = li2 -> p2.x;
- pt_p -> y = cy = li2 -> p2.y;
- pt_p++;
- AddToBBox(&bch.bounds, cx, cy);
- }
- while (1);
-
- /* save the block chain */
- bch.numpoints = pt_p - temppoints;
- bch.points = (bpoint_t *) malloc(bch.numpoints * sizeof(*bch.points));
- memcpy(bch.points, temppoints, bch.numpoints * sizeof(*bch.points));
- /* [chains_i addElement: &bch]; */
- memcpy((bchain_t *) chains_i -> data + chains_i -> count, &bch, sizeof(bchain_t));
- chains_i -> count += 1;
- chains_i -> data = (bchain_t *) realloc(chains_i -> data,
- sizeof(bchain_t) * (chains_i -> count + 1));
- /*DrawBChain (&bch); */
- }
-
- /*
- numbchains = [chains_i count];
- bchains = [chains_i elementAt:0];
- */
- numbchains = chains_i -> count;
- bchains = chains_i -> data;
- }
-
-
- /*
- ====================
- =
- = ProcessConnections
- =
- ====================
- */
-
- void ProcessConnections(void)
- {
- int i,
- s,
- wlcount,
- count;
- bbox_t *secbox;
-
- /* id lines; */
- STORAGE *lines;
- worldline_t *wl;
- mapvertex_t *vt;
- maplinedef_t *p;
- mapsidedef_t *sd;
- bline_t bline;
- int sec;
- int RonsLines = 0;
-
- /*
- numsectors = [secstore_i count];
- wlcount = [linestore_i count];
- */
-
- numsectors = secstore_i -> count;
- wlcount = linestore_i -> count;
-
- connections = (unsigned char *)malloc(numsectors * numsectors + 8); /* allow rounding to bytes */
- memset(connections, 0, numsectors * numsectors);
-
- secboxes = secbox = (bbox_t *) malloc(numsectors * sizeof(bbox_t));
- for (i = 0; i < numsectors; i++, secbox++)
- ClearBBox(secbox);
-
- /*
- calculate bounding boxes for all sectors
-
- count = [ldefstore_i count];
- p = [ldefstore_i elementAt:0];
- vt = [mapvertexstore_i elementAt:0];
- */
-
- count = ldefstore_i -> count;
- p = ldefstore_i -> data;
- vt = mapvertexstore_i -> data;
- printf("\n");
- for (i = 0; i < count; i++, p++)
- {
- printf("BBox #%d of %d\r", i, count);
- for (s = 0; s < 1; s++)
- {
- if (p -> sidenum[s] == -1)
- continue; /* no back side */
- /* add both points to sector bounding box */
- /* sd = (mapsidedef_t *)[sdefstore_i elementAt: p->sidenum[s]]; */
- sd = (mapsidedef_t *) sdefstore_i -> data + p -> sidenum[s];
- sec = sd -> sector;
- AddToBBox(&secboxes[sec], vt[p -> v1].x, vt[p -> v1].y);
- AddToBBox(&secboxes[sec], vt[p -> v2].x, vt[p -> v2].y);
- }
- }
-
- /*
- make a list of only the solid lines
- */
- /*
- lines = [[Storage alloc]
- initCount: 0
- elementSize: sizeof(bline)
- description: NULL];
- */
- /*
- lines = SafeMalloc(sizeof(STORAGE));
- lines->data = SafeMalloc(sizeof(bline));
- lines->count = 0;
- lines->size = sizeof(bline);
- */
-
- /* wl = [linestore_i elementAt: 0]; */
- printf("\n");
- wl = linestore_i -> data;
- for (i = 0; i < wlcount; wl++, i++)
- {
- if (wl -> flags & ML_TWOSIDED)
- continue;
- RonsLines++;
- }
-
- lines = (STORAGE *) SafeMalloc(sizeof(STORAGE));
- lines -> data = (bline_t *) SafeCalloc(RonsLines, sizeof(bline));
- lines -> count = 0;
- lines -> size = sizeof(bline);
-
- wl = linestore_i -> data;
- for (i = 0; i < wlcount; wl++, i++)
- {
- printf("Line #%d of %d\r", i, wlcount);
- if (wl -> flags & ML_TWOSIDED)
- continue; /* don't add two sided lines */
- bline.p1.x = wl -> p1.x;
- bline.p1.y = wl -> p1.y;
- bline.p2.x = wl -> p2.x;
- bline.p2.y = wl -> p2.y;
- /* [lines addElement: &bline]; */
- memcpy((bline_t *) lines -> data + lines -> count, &bline, sizeof(bline));
- lines -> count += 1;
- /*
- lines->data = (bline_t *)realloc(lines->data,
- sizeof(bline_t) + (lines->count + 1));
- */
- }
-
- /*
- blines = [lines elementAt: 0];
- numblines = [lines count];
- */
-
- blines = lines -> data;
- numblines = lines -> count;
-
- /*
- build blocking chains
- */
- printf("\nBuildBlockingChains\n");
- BuildBlockingChains();
-
- /*
- build connection list
- */
- printf("\nBuildConnections\n");
- BuildConnections();
- }
-
-
- /*
- =================
- =
- = OutputConnections
- =
- =================
- */
-
- void OutputConnections(void)
- {
- int i;
- int bytes;
- char *cons;
- char *bits;
-
- cons = connections;
- bytes = (numsectors * numsectors + 7) / 8;
- bits = (char *)malloc(bytes);
-
- for (i = 0; i < bytes; i++)
- {
- bits[i] = cons[0] + (cons[1] << 1) + (cons[2] << 2) + (cons[3] << 3) + (cons[4] << 4) + (cons[5] << 5) + (cons[6] << 6) + (cons[7] << 7);
- cons += 8;
- }
-
- /* [wad_i addName: "reject" data:bits size:bytes]; */
- addName("reject", bits, bytes);
- printf("reject: %i\n", bytes);
- }
-