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level.c
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level.c
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//------------------------------------------------------------------------
// LEVEL : Level structure read/write functions.
//------------------------------------------------------------------------
//
// GL-Friendly Node Builder (C) 2000-2002 Andrew Apted
//
// Based on `BSP 2.3' by Colin Reed, Lee Killough and others.
//
// 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 "system.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
#include <math.h>
#include <limits.h>
#include <assert.h>
#include "blockmap.h"
#include "level.h"
#include "node.h"
#include "reject.h"
#include "seg.h"
#include "structs.h"
#include "util.h"
#include "wad.h"
#define DEBUG_LOAD 0
#define DEBUG_BSP 0
#define DEBUG_SORTER 0
#define DEBUG_WALLTIPS 0
#define DEBUG_POLYOBJ 0
#define ALLOC_BLKNUM 1024
// per-level variables
static boolean_g normal_exists;
static boolean_g doing_normal;
static boolean_g doing_gl;
static boolean_g doing_hexen;
#define LEVELARRAY(TYPE, BASEVAR, NUMVAR) \
static TYPE ** BASEVAR = NULL; \
int NUMVAR = 0;
LEVELARRAY(vertex_t, vertices, num_vertices)
LEVELARRAY(linedef_t, linedefs, num_linedefs)
LEVELARRAY(sidedef_t, sidedefs, num_sidedefs)
LEVELARRAY(sector_t, sectors, num_sectors)
LEVELARRAY(seg_t, segs, num_segs)
LEVELARRAY(subsec_t, subsecs, num_subsecs)
LEVELARRAY(node_t, nodes, num_nodes)
LEVELARRAY(wall_tip_t,wall_tips,num_wall_tips)
int num_normal_vert = 0;
int num_gl_vert = 0;
int num_complete_seg = 0;
/* ----- allocation routines ---------------------------- */
#define ALLIGATOR(TYPE, BASEVAR, NUMVAR) \
{ \
if ((NUMVAR % ALLOC_BLKNUM) == 0) \
{ \
BASEVAR = UtilRealloc(BASEVAR, (NUMVAR + ALLOC_BLKNUM) * \
sizeof(TYPE *)); \
} \
BASEVAR[NUMVAR] = (TYPE *) UtilCalloc(sizeof(TYPE)); \
NUMVAR += 1; \
return BASEVAR[NUMVAR - 1]; \
}
vertex_t *NewVertex(void)
ALLIGATOR(vertex_t, vertices, num_vertices)
linedef_t *NewLinedef(void)
ALLIGATOR(linedef_t, linedefs, num_linedefs)
sidedef_t *NewSidedef(void)
ALLIGATOR(sidedef_t, sidedefs, num_sidedefs)
sector_t *NewSector(void)
ALLIGATOR(sector_t, sectors, num_sectors)
seg_t *NewSeg(void)
ALLIGATOR(seg_t, segs, num_segs)
subsec_t *NewSubsec(void)
ALLIGATOR(subsec_t, subsecs, num_subsecs)
node_t *NewNode(void)
ALLIGATOR(node_t, nodes, num_nodes)
wall_tip_t *NewWallTip(void)
ALLIGATOR(wall_tip_t, wall_tips, num_wall_tips)
/* ----- free routines ---------------------------- */
#define FREEMASON(TYPE, BASEVAR, NUMVAR) \
{ \
int i; \
for (i=0; i < NUMVAR; i++) \
UtilFree(BASEVAR[i]); \
if (BASEVAR) \
UtilFree(BASEVAR); \
BASEVAR = NULL; NUMVAR = 0; \
}
void FreeVertices(void)
FREEMASON(vertex_t, vertices, num_vertices)
void FreeLinedefs(void)
FREEMASON(linedef_t, linedefs, num_linedefs)
void FreeSidedefs(void)
FREEMASON(sidedef_t, sidedefs, num_sidedefs)
void FreeSectors(void)
FREEMASON(sector_t, sectors, num_sectors)
void FreeSegs(void)
FREEMASON(seg_t, segs, num_segs)
void FreeSubsecs(void)
FREEMASON(subsec_t, subsecs, num_subsecs)
void FreeNodes(void)
FREEMASON(node_t, nodes, num_nodes)
void FreeWallTips(void)
FREEMASON(wall_tip_t, wall_tips, num_wall_tips)
/* ----- lookup routines ------------------------------ */
#define LOOKERUPPER(BASEVAR, NUMVAR, NAMESTR) \
{ \
if (index < 0 || index >= NUMVAR) \
FatalError("No such %s number #%d", NAMESTR, index); \
\
return BASEVAR[index]; \
}
vertex_t *LookupVertex(int index)
LOOKERUPPER(vertices, num_vertices, "vertex")
linedef_t *LookupLinedef(int index)
LOOKERUPPER(linedefs, num_linedefs, "linedef")
sidedef_t *LookupSidedef(int index)
LOOKERUPPER(sidedefs, num_sidedefs, "sidedef")
sector_t *LookupSector(int index)
LOOKERUPPER(sectors, num_sectors, "sector")
seg_t *LookupSeg(int index)
LOOKERUPPER(segs, num_segs, "seg")
subsec_t *LookupSubsec(int index)
LOOKERUPPER(subsecs, num_subsecs, "subsector")
node_t *LookupNode(int index)
LOOKERUPPER(nodes, num_nodes, "node")
/* ----- reading routines ------------------------------ */
//
// CheckForNormalNodes
//
boolean_g CheckForNormalNodes(void)
{
lump_t *lump;
// Note: an empty NODES lump can be valid.
if (FindLevelLump("NODES") == NULL)
return FALSE;
lump = FindLevelLump("SEGS");
if (! lump || lump->length == 0 || CheckLevelLumpZero(lump))
return FALSE;
lump = FindLevelLump("SSECTORS");
if (! lump || lump->length == 0 || CheckLevelLumpZero(lump))
return FALSE;
return TRUE;
}
//
// GetVertices
//
void GetVertices(void)
{
int i, count=-1;
raw_vertex_t *raw;
lump_t *lump = FindLevelLump("VERTEXES");
if (lump)
count = lump->length / sizeof(raw_vertex_t);
DisplayTicker();
#if DEBUG_LOAD
PrintDebug("GetVertices: num = %d\n", count);
#endif
if (!lump || count == 0)
FatalError("Couldn't find any Vertices");
raw = (raw_vertex_t *) lump->data;
for (i=0; i < count; i++, raw++)
{
vertex_t *vert = NewVertex();
vert->x = (float_g) SINT16(raw->x);
vert->y = (float_g) SINT16(raw->y);
vert->index = i;
}
num_normal_vert = num_vertices;
num_gl_vert = 0;
num_complete_seg = 0;
}
//
// GetSectors
//
void GetSectors(void)
{
int i, count=-1;
raw_sector_t *raw;
lump_t *lump = FindLevelLump("SECTORS");
if (lump)
count = lump->length / sizeof(raw_sector_t);
if (!lump || count == 0)
FatalError("Couldn't find any Sectors");
DisplayTicker();
#if DEBUG_LOAD
PrintDebug("GetSectors: num = %d\n", count);
#endif
raw = (raw_sector_t *) lump->data;
for (i=0; i < count; i++, raw++)
{
sector_t *sector = NewSector();
sector->floor_h = SINT16(raw->floor_h);
sector->ceil_h = SINT16(raw->ceil_h);
memcpy(sector->floor_tex, raw->floor_tex, sizeof(sector->floor_tex));
memcpy(sector->ceil_tex, raw->ceil_tex, sizeof(sector->ceil_tex));
sector->light = UINT16(raw->light);
sector->special = UINT16(raw->special);
sector->tag = SINT16(raw->tag);
sector->coalesce = (sector->tag >= 900 && sector->tag < 1000) ?
TRUE : FALSE;
// sector indices never change
sector->index = i;
// Note: rej_* fields are handled completely in reject.c
}
}
//
// GetSidedefs
//
void GetSidedefs(void)
{
int i, count=-1;
raw_sidedef_t *raw;
lump_t *lump = FindLevelLump("SIDEDEFS");
if (lump)
count = lump->length / sizeof(raw_sidedef_t);
if (!lump || count == 0)
FatalError("Couldn't find any Sidedefs");
DisplayTicker();
#if DEBUG_LOAD
PrintDebug("GetSidedefs: num = %d\n", count);
#endif
raw = (raw_sidedef_t *) lump->data;
for (i=0; i < count; i++, raw++)
{
sidedef_t *side = NewSidedef();
side->sector = (SINT16(raw->sector) == -1) ? NULL :
LookupSector(UINT16(raw->sector));
if (side->sector)
side->sector->ref_count++;
side->x_offset = SINT16(raw->x_offset);
side->y_offset = SINT16(raw->y_offset);
memcpy(side->upper_tex, raw->upper_tex, sizeof(side->upper_tex));
memcpy(side->lower_tex, raw->lower_tex, sizeof(side->lower_tex));
memcpy(side->mid_tex, raw->mid_tex, sizeof(side->mid_tex));
// sidedef indices never change
side->index = i;
}
}
//
// GetLinedefs
//
void GetLinedefs(void)
{
int i, count=-1;
raw_linedef_t *raw;
lump_t *lump = FindLevelLump("LINEDEFS");
if (lump)
count = lump->length / sizeof(raw_linedef_t);
if (!lump || count == 0)
FatalError("Couldn't find any Linedefs");
DisplayTicker();
#if DEBUG_LOAD
PrintDebug("GetLinedefs: num = %d\n", count);
#endif
raw = (raw_linedef_t *) lump->data;
for (i=0; i < count; i++, raw++)
{
linedef_t *line;
vertex_t *start = LookupVertex(UINT16(raw->start));
vertex_t *end = LookupVertex(UINT16(raw->end));
start->ref_count++;
end->ref_count++;
line = NewLinedef();
line->start = start;
line->end = end;
// check for zero-length line
line->zero_len = (fabs(start->x - end->x) < DIST_EPSILON) &&
(fabs(start->y - end->y) < DIST_EPSILON);
line->flags = UINT16(raw->flags);
line->type = UINT16(raw->type);
line->tag = SINT16(raw->tag);
line->two_sided = (line->flags & LINEFLAG_TWO_SIDED) ? TRUE : FALSE;
line->is_precious = (line->tag >= 900 && line->tag < 1000) ?
TRUE : FALSE;
line->right = (SINT16(raw->sidedef1) < 0) ? NULL :
LookupSidedef(SINT16(raw->sidedef1));
line->left = (SINT16(raw->sidedef2) < 0) ? NULL :
LookupSidedef(SINT16(raw->sidedef2));
if (line->right)
{
line->right->ref_count++;
line->right->on_special |= (line->type > 0) ? 1 : 0;
}
if (line->left)
{
line->left->ref_count++;
line->left->on_special |= (line->type > 0) ? 1 : 0;
}
line->index = i;
}
}
//
// GetLinedefsHexen
//
void GetLinedefsHexen(void)
{
int i, j, count=-1;
raw_hexen_linedef_t *raw;
lump_t *lump = FindLevelLump("LINEDEFS");
if (lump)
count = lump->length / sizeof(raw_hexen_linedef_t);
if (!lump || count == 0)
FatalError("Couldn't find any Linedefs");
DisplayTicker();
#if DEBUG_LOAD
PrintDebug("GetLinedefs: num = %d\n", count);
#endif
raw = (raw_hexen_linedef_t *) lump->data;
for (i=0; i < count; i++, raw++)
{
linedef_t *line;
vertex_t *start = LookupVertex(UINT16(raw->start));
vertex_t *end = LookupVertex(UINT16(raw->end));
start->ref_count++;
end->ref_count++;
line = NewLinedef();
line->start = start;
line->end = end;
// check for zero-length line
line->zero_len = (fabs(start->x - end->x) < DIST_EPSILON) &&
(fabs(start->y - end->y) < DIST_EPSILON);
line->flags = UINT16(raw->flags);
line->type = UINT8(raw->type);
line->tag = 0;
// read specials
for (j=0; j < 5; j++)
line->specials[j] = UINT8(raw->specials[j]);
line->right = (SINT16(raw->sidedef1) < 0) ? NULL :
LookupSidedef(SINT16(raw->sidedef1));
line->left = (SINT16(raw->sidedef2) < 0) ? NULL :
LookupSidedef(SINT16(raw->sidedef2));
// -JL- Added missing sidedef handling that caused all sidedefs to be
// pruned.
if (line->right)
{
line->right->ref_count++;
line->right->on_special |= (line->type > 0) ? 1 : 0;
}
if (line->left)
{
line->left->ref_count++;
line->left->on_special |= (line->type > 0) ? 1 : 0;
}
line->index = i;
// handle polyobj lines
if (line->type == HEXTYPE_POLY_START)
{
line->polyobj = 1;
start->polyobj = end->polyobj = 1;
}
else if (line->type == HEXTYPE_POLY_EXPLICIT)
{
line->polyobj = 1;
}
}
}
static void MarkPolyobjSector(sector_t *sector)
{
int i;
if (! sector)
return;
#if DEBUG_POLYOBJ
PrintDebug(" Marking SECTOR %d\n", sector->index);
#endif
// mark all lines of this sector as precious, to prevent the sector
// from being split.
sector->polyobj = TRUE;
for (i = 0; i < num_linedefs; i++)
{
linedef_t *L = linedefs[i];
if ((L->right && L->right->sector == sector) ||
(L->left && L->left->sector == sector))
{
L->is_precious = TRUE;
}
}
}
static void MarkPolyobjPoint(float_g x, float_g y)
{
int i;
float_g best_dist = 999999;
linedef_t *best_match = NULL;
sector_t *sector = NULL;
float_g x1, y1;
float_g x2, y2;
// -AJA- Algorithm is just like in DEU: we cast a line horizontally
// from the given (x,y) position and find all linedefs that
// intersect it, choosing the one with the closest distance. If the
// point is sitting directly on a (two-sided) line, then we mark the
// sectors on both sides.
for (i = 0; i < num_linedefs; i++)
{
linedef_t *L = linedefs[i];
float_g x_cut;
x1 = L->start->x; y1 = L->start->y;
x2 = L->end->x; y2 = L->end->y;
// check vertical range
if (fabs(y2 - y1) < DIST_EPSILON)
continue;
if ((y > (y1 + DIST_EPSILON) && y > (y2 + DIST_EPSILON)) ||
(y < (y1 - DIST_EPSILON) && y < (y2 - DIST_EPSILON)))
continue;
x_cut = x1 + (x2 - x1) * (y - y1) / (y2 - y1) - x;
if (fabs(x_cut) < fabs(best_dist))
{
// found a closer linedef
best_match = L;
best_dist = x_cut;
}
}
if (! best_match)
{
PrintWarn("Bad polyobj thing at (%1.0f,%1.0f).\n", x, y);
return;
}
y1 = best_match->start->y;
y2 = best_match->end->y;
#if DEBUG_POLYOBJ
PrintDebug(" Closest line was %d Y=%1.0f..%1.0f (dist=%1.1f)\n",
best_match->index, y1, y2, best_dist);
#endif
// directly on the line ?
if (fabs(best_dist) < DIST_EPSILON)
{
if (best_match->left)
MarkPolyobjSector(best_match->left->sector);
if (best_match->right)
MarkPolyobjSector(best_match->right->sector);
return;
}
// check orientation of line, to determine which side the polyobj is
// actually on.
if ((y1 > y2) == (best_dist > 0))
sector = best_match->right ? best_match->right->sector : NULL;
else
sector = best_match->left ? best_match->left->sector : NULL;
#if DEBUG_POLYOBJ
PrintDebug(" Sector %d contains the polyobj.\n",
sector ? sector->index : -1);
#endif
if (! sector)
{
PrintWarn("Invalid Polyobj thing at (%1.0f,%1.0f).\n", x, y);
return;
}
MarkPolyobjSector(sector);
}
//
// FindPolyobjSectors
//
// Based on code courtesy of Janis Legzdinsh.
//
void FindPolyobjSectors(void)
{
int i, count=-1;
raw_hexen_thing_t *raw;
lump_t *lump = FindLevelLump("THINGS");
if (lump)
count = lump->length / sizeof(raw_hexen_thing_t);
// Note: no error if no things exist, even though technically a map
// will be unplayable without the player starts.
if (!lump || count==0)
return;
raw = (raw_hexen_thing_t*) lump->data;
for (i = 0; i < count; i++, raw++)
{
float_g x = (float_g) SINT16(raw->x);
float_g y = (float_g) SINT16(raw->y);
int type = UINT16(raw->type);
// not a polyobj start spot
if (type != PO_SPAWN_TYPE && type != PO_SPAWNCRUSH_TYPE)
continue;
#if DEBUG_POLYOBJ
PrintDebug("Thing %d at (%1.0f,%1.0f) is a polyobj spawner.\n",
i, x, y);
#endif
MarkPolyobjPoint(x, y);
}
}
/* ----- analysis routines ----------------------------- */
#ifdef WIN32
# define C_DECL __cdecl
#else
# define C_DECL
#endif
static int C_DECL VertexCompare(const void *p1, const void *p2)
{
int vert1 = ((const uint16_g *) p1)[0];
int vert2 = ((const uint16_g *) p2)[0];
vertex_t *A = vertices[vert1];
vertex_t *B = vertices[vert2];
if (vert1 == vert2)
return 0;
if ((int)A->x != (int)B->x)
return (int)A->x - (int)B->x;
return (int)A->y - (int)B->y;
}
static int C_DECL SidedefCompare(const void *p1, const void *p2)
{
int comp;
int side1 = ((const uint16_g *) p1)[0];
int side2 = ((const uint16_g *) p2)[0];
sidedef_t *A = sidedefs[side1];
sidedef_t *B = sidedefs[side2];
if (side1 == side2)
return 0;
// don't merge sidedefs on special lines
if (A->on_special || B->on_special)
return side1 - side2;
if (A->sector != B->sector)
{
if (A->sector == NULL) return -1;
if (B->sector == NULL) return +1;
return (A->sector->index - B->sector->index);
}
if ((int)A->x_offset != (int)B->x_offset)
return A->x_offset - (int)B->x_offset;
if ((int)A->y_offset != B->y_offset)
return (int)A->y_offset - (int)B->y_offset;
// compare textures
comp = memcmp(A->upper_tex, B->upper_tex, sizeof(A->upper_tex));
if (comp) return comp;
comp = memcmp(A->lower_tex, B->lower_tex, sizeof(A->lower_tex));
if (comp) return comp;
comp = memcmp(A->mid_tex, B->mid_tex, sizeof(A->mid_tex));
if (comp) return comp;
// sidedefs must be the same
return 0;
}
static void DetectDuplicateVertices(void)
{
int i;
uint16_g *array = UtilCalloc(num_vertices * sizeof(uint16_g));
DisplayTicker();
// sort array of indices
for (i=0; i < num_vertices; i++)
array[i] = i;
qsort(array, num_vertices, sizeof(uint16_g), VertexCompare);
// now mark them off
for (i=0; i < num_vertices - 1; i++)
{
// duplicate ?
if (VertexCompare(array + i, array + i+1) == 0)
{
vertex_t *A = vertices[array[i]];
vertex_t *B = vertices[array[i+1]];
// found a duplicate !
if (A->equiv)
B->equiv = A->equiv;
else
B->equiv = A;
B->equiv->polyobj |= B->polyobj;
}
}
UtilFree(array);
}
static void DetectDuplicateSidedefs(void)
{
int i;
uint16_g *array = UtilCalloc(num_sidedefs * sizeof(uint16_g));
DisplayTicker();
// sort array of indices
for (i=0; i < num_sidedefs; i++)
array[i] = i;
qsort(array, num_sidedefs, sizeof(uint16_g), SidedefCompare);
// now mark them off
for (i=0; i < num_sidedefs - 1; i++)
{
// duplicate ?
if (SidedefCompare(array + i, array + i+1) == 0)
{
sidedef_t *A = sidedefs[array[i]];
sidedef_t *B = sidedefs[array[i+1]];
// found a duplicate !
if (A->equiv)
B->equiv = A->equiv;
else
B->equiv = A;
}
}
UtilFree(array);
}
static void PruneLinedefs(void)
{
int i;
int new_num;
DisplayTicker();
// scan all linedefs
for (i=0, new_num=0; i < num_linedefs; i++)
{
linedef_t *L = linedefs[i];
// handle duplicated vertices
while (L->start->equiv)
{
L->start->ref_count--;
L->start = L->start->equiv;
L->start->ref_count++;
}
while (L->end->equiv)
{
L->end->ref_count--;
L->end = L->end->equiv;
L->end->ref_count++;
}
// handle duplicated sidedefs
while (L->right && L->right->equiv)
{
L->right->ref_count--;
L->right = L->right->equiv;
L->right->ref_count++;
}
while (L->left && L->left->equiv)
{
L->left->ref_count--;
L->left = L->left->equiv;
L->left->ref_count++;
}
// remove zero length lines
if (L->zero_len)
{
L->start->ref_count--;
L->end->ref_count--;
UtilFree(L);
continue;
}
L->index = new_num;
linedefs[new_num++] = L;
}
if (new_num < num_linedefs)
{
PrintMsg("Pruned %d zero-length linedefs\n", num_linedefs - new_num);
num_linedefs = new_num;
}
if (new_num == 0)
FatalError("Couldn't find any Linedefs");
}
static void PruneVertices(void)
{
int i;
int new_num;
int unused = 0;
DisplayTicker();
// scan all vertices
for (i=0, new_num=0; i < num_vertices; i++)
{
vertex_t *V = vertices[i];
if (V->ref_count < 0)
InternalError("Vertex %d ref_count is %d", i, V->ref_count);
if (V->ref_count == 0)
{
if (V->equiv == NULL)
unused++;
UtilFree(V);
continue;
}
V->index = new_num;
vertices[new_num++] = V;
}
if (new_num < num_vertices)
{
int dup_num = num_vertices - new_num - unused;
if (unused > 0)
PrintMsg("Pruned %d unused vertices "
"(this is normal if the nodes were built before)\n", unused);
if (dup_num > 0)
PrintMsg("Pruned %d duplicate vertices\n", dup_num);
num_vertices = new_num;
}
if (new_num == 0)
FatalError("Couldn't find any Vertices");
num_normal_vert = num_vertices;
}
static void PruneSidedefs(void)
{
int i;
int new_num;
int unused = 0;
DisplayTicker();
// scan all sidedefs
for (i=0, new_num=0; i < num_sidedefs; i++)
{
sidedef_t *S = sidedefs[i];
if (S->ref_count < 0)
InternalError("Sidedef %d ref_count is %d", i, S->ref_count);
if (S->ref_count == 0)
{
if (S->sector)
S->sector->ref_count--;
if (S->equiv == NULL)
unused++;
UtilFree(S);
continue;
}
S->index = new_num;
sidedefs[new_num++] = S;
}
if (new_num < num_sidedefs)
{
int dup_num = num_sidedefs - new_num - unused;
if (unused > 0)
PrintMsg("Pruned %d unused sidedefs\n", unused);
if (dup_num > 0)
PrintMsg("Pruned %d duplicate sidedefs\n", dup_num);
num_sidedefs = new_num;
}
if (new_num == 0)
FatalError("Couldn't find any Sidedefs");
}
static void PruneSectors(void)
{
int i;
int new_num;
DisplayTicker();
// scan all sectors
for (i=0, new_num=0; i < num_sectors; i++)
{
sector_t *S = sectors[i];
if (S->ref_count < 0)
InternalError("Sector %d ref_count is %d", i, S->ref_count);
if (S->ref_count == 0)
{
UtilFree(S);
continue;
}
S->index = new_num;
sectors[new_num++] = S;
}
if (new_num < num_sectors)
{
PrintMsg("Pruned %d unused sectors\n", num_sectors - new_num);
num_sectors = new_num;
}