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ericw-tools/qbsp/portals.c

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/*
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 1997 Greg Lewis
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
See file, 'COPYING', for details.
*/
// portals.c
#include "qbsp.h"
node_t outside_node; // portals outside the world face this
int num_visportals;
static int num_visleafs; // leafs the player can be in
static int iNodesDone;
static FILE *PortalFile;
/*
==============================================================================
PORTAL FILE GENERATION
==============================================================================
*/
static void PlaneFromWinding(winding_t *w, plane_t *plane);
static void
WriteFloat(vec_t v)
{
if (fabs(v - Q_rint(v)) < ZERO_EPSILON)
fprintf(PortalFile, "%i ", (int)Q_rint(v));
else
fprintf(PortalFile, "%f ", v);
}
static int
SameContent(int Cont0, int Cont1)
{
/* If contents values are the same, contents are equal */
if (Cont0 == Cont1)
return 1;
/* If water is transparent, liquids are like empty space */
if (options.fTranswater && ((Cont0 >= CONTENTS_LAVA
&& Cont0 <= CONTENTS_WATER
&& Cont1 == CONTENTS_EMPTY)
|| (Cont0 == CONTENTS_EMPTY
&& Cont1 >= CONTENTS_LAVA
&& Cont1 <= CONTENTS_WATER)))
return 1;
/* If sky is transparent, then sky is like empty space */
if (options.fTranssky && ((Cont0 == CONTENTS_SKY
&& Cont1 == CONTENTS_EMPTY)
|| (Cont0 == CONTENTS_EMPTY
&& Cont1 == CONTENTS_SKY)))
return 1;
return false;
}
static void
WritePortalFile_r(node_t *node)
{
int i;
portal_t *p;
winding_t *w;
plane_t *pl, plane2;
if (!node->contents) {
WritePortalFile_r(node->children[0]);
WritePortalFile_r(node->children[1]);
return;
}
if (node->contents == CONTENTS_SOLID)
return;
for (p = node->portals; p;) {
w = p->winding;
if (w && p->nodes[0] == node
&& SameContent(p->nodes[0]->contents, p->nodes[1]->contents)) {
/*
* sometimes planes get turned around when they are very near
* the changeover point between different axis. interpret the
* plane the same way vis will, and flip the side orders if needed
*/
pl = &map.planes[p->planenum];
PlaneFromWinding(w, &plane2);
if (DotProduct(pl->normal, plane2.normal) < 1.0 - ANGLEEPSILON) {
/* backwards... */
fprintf(PortalFile, "%i %i %i ", w->numpoints,
p->nodes[1]->visleafnum, p->nodes[0]->visleafnum);
} else
fprintf(PortalFile, "%i %i %i ", w->numpoints,
p->nodes[0]->visleafnum, p->nodes[1]->visleafnum);
for (i = 0; i < w->numpoints; i++) {
fprintf(PortalFile, "(");
WriteFloat(w->points[i][0]);
WriteFloat(w->points[i][1]);
WriteFloat(w->points[i][2]);
fprintf(PortalFile, ") ");
}
fprintf(PortalFile, "\n");
}
if (p->nodes[0] == node)
p = p->next[0];
else
p = p->next[1];
}
}
/*
================
NumberLeafs_r
================
*/
static void
NumberLeafs_r(node_t *node)
{
portal_t *p;
if (!node->contents) { // decision node
node->visleafnum = -99;
NumberLeafs_r(node->children[0]);
NumberLeafs_r(node->children[1]);
return;
}
if (node->contents == CONTENTS_SOLID) {
/* solid block, viewpoint never inside */
node->visleafnum = -1;
return;
}
node->visleafnum = num_visleafs++;
for (p = node->portals; p;) {
/* only write out from first leaf */
if (p->nodes[0] == node) {
if (SameContent(p->nodes[0]->contents, p->nodes[1]->contents))
num_visportals++;
p = p->next[0];
} else
p = p->next[1];
}
}
/*
================
WritePortalfile
================
*/
static void
WritePortalfile(node_t *headnode)
{
// set the visleafnum field in every leaf and count the total number of portals
num_visleafs = 0;
num_visportals = 0;
NumberLeafs_r(headnode);
// write the file
StripExtension(options.szBSPName);
strcat(options.szBSPName, ".prt");
PortalFile = fopen(options.szBSPName, "wt");
if (PortalFile == NULL)
Error(errOpenFailed, options.szBSPName, strerror(errno));
fprintf(PortalFile, "PRT1\n");
fprintf(PortalFile, "%i\n", num_visleafs);
fprintf(PortalFile, "%i\n", num_visportals);
WritePortalFile_r(headnode);
fclose(PortalFile);
}
//=============================================================================
/*
=============
AddPortalToNodes
=============
*/
static void
AddPortalToNodes(portal_t *p, node_t *front, node_t *back)
{
if (p->nodes[0] || p->nodes[1])
Error(errPortalAlreadyAdded);
p->nodes[0] = front;
p->next[0] = front->portals;
front->portals = p;
p->nodes[1] = back;
p->next[1] = back->portals;
back->portals = p;
}
/*
=============
RemovePortalFromNode
=============
*/
static void
RemovePortalFromNode(portal_t *portal, node_t *l)
{
portal_t **pp, *t;
// remove reference to the current portal
pp = &l->portals;
while (1) {
t = *pp;
if (!t)
Error(errPortalNotInLeaf);
if (t == portal)
break;
if (t->nodes[0] == l)
pp = &t->next[0];
else if (t->nodes[1] == l)
pp = &t->next[1];
else
Error(errPortalNotBoundLeaf);
}
if (portal->nodes[0] == l) {
*pp = portal->next[0];
portal->nodes[0] = NULL;
} else if (portal->nodes[1] == l) {
*pp = portal->next[1];
portal->nodes[1] = NULL;
}
}
/*
================
MakeHeadnodePortals
The created portals will face the global outside_node
================
*/
static void
MakeHeadnodePortals(const mapentity_t *ent, node_t *node)
{
vec3_t bounds[2];
int i, j, n;
portal_t *p, *portals[6];
plane_t bplanes[6], *pl;
int side;
// pad with some space so there will never be null volume leafs
for (i = 0; i < 3; i++) {
bounds[0][i] = ent->mins[i] - SIDESPACE;
bounds[1][i] = ent->maxs[i] + SIDESPACE;
}
outside_node.contents = CONTENTS_SOLID;
outside_node.portals = NULL;
for (i = 0; i < 3; i++)
for (j = 0; j < 2; j++) {
n = j * 3 + i;
p = AllocMem(PORTAL, 1, true);
portals[n] = p;
pl = &bplanes[n];
memset(pl, 0, sizeof(*pl));
if (j) {
pl->normal[i] = -1;
pl->dist = -bounds[j][i];
} else {
pl->normal[i] = 1;
pl->dist = bounds[j][i];
}
p->planenum = FindPlane(pl, &side);
p->winding = BaseWindingForPlane(pl);
if (side)
AddPortalToNodes(p, &outside_node, node);
else
AddPortalToNodes(p, node, &outside_node);
}
// clip the basewindings by all the other planes
for (i = 0; i < 6; i++) {
for (j = 0; j < 6; j++) {
if (j == i)
continue;
portals[i]->winding =
ClipWinding(portals[i]->winding, &bplanes[j], true);
}
}
}
static void
PlaneFromWinding(winding_t *w, plane_t *plane)
{
vec3_t v1, v2;
// calc plane
VectorSubtract(w->points[2], w->points[1], v1);
VectorSubtract(w->points[0], w->points[1], v2);
CrossProduct(v2, v1, plane->normal);
VectorNormalize(plane->normal);
plane->dist = DotProduct(w->points[0], plane->normal);
}
//============================================================================
#ifdef PARANOID
static void
CheckWindingInNode(winding_t *w, node_t *node)
{
int i, j;
for (i = 0; i < w->numpoints; i++) {
for (j = 0; j < 3; j++)
if (w->points[i][j] < node->mins[j] - 1
|| w->points[i][j] > node->maxs[j] + 1) {
Message(msgWarning, warnWindingOutside);
return;
}
}
}
static void
CheckWindingArea(winding_t *w)
{
int i;
vec_t total, add;
vec3_t v1, v2, cross;
total = 0;
for (i = 1; i < w->numpoints; i++) {
VectorSubtract(w->points[i], w->points[0], v1);
VectorSubtract(w->points[i + 1], w->points[0], v2);
CrossProduct(v1, v2, cross);
add = VectorLength(cross);
total += add * 0.5;
}
if (total < 16)
Message(msgWarning, warnLowWindingArea, total);
}
static void
CheckLeafPortalConsistancy(node_t *node)
{
int side, side2;
portal_t *p, *p2;
plane_t plane, plane2;
int i;
winding_t *w;
vec_t dist;
side = side2 = 0; // quiet compiler warning
for (p = node->portals; p; p = p->next[side]) {
if (p->nodes[0] == node)
side = 0;
else if (p->nodes[1] == node)
side = 1;
else
Error(errMislinkedPortal);
CheckWindingInNode(p->winding, node);
CheckWindingArea(p->winding);
// check that the side orders are correct
plane = map.planes[p->planenum];
PlaneFromWinding(p->winding, &plane2);
for (p2 = node->portals; p2; p2 = p2->next[side2]) {
if (p2->nodes[0] == node)
side2 = 0;
else if (p2->nodes[1] == node)
side2 = 1;
else
Error(errMislinkedPortal);
w = p2->winding;
for (i = 0; i < w->numpoints; i++) {
dist = DotProduct(w->points[i], plane.normal) - plane.dist;
if ((side == 0 && dist < -1) || (side == 1 && dist > 1)) {
Message(msgWarning, warnBadPortalDirection);
return;
}
}
}
}
}
#endif /* PARANOID */
//============================================================================
/*
================
CutNodePortals_r
================
*/
static void
CutNodePortals_r(node_t *node)
{
plane_t *plane, clipplane;
node_t *f, *b, *other_node;
portal_t *p, *new_portal, *next_portal;
winding_t *w, *frontwinding, *backwinding;
int side;
#ifdef PARANOID
CheckLeafPortalConsistancy (node);
#endif
// separate the portals on node into it's children
if (node->contents)
return; // at a leaf, no more dividing
plane = &map.planes[node->planenum];
f = node->children[0];
b = node->children[1];
// create the new portal by taking the full plane winding for the cutting plane
// and clipping it by all of the planes from the other portals
new_portal = AllocMem(PORTAL, 1, true);
new_portal->planenum = node->planenum;
w = BaseWindingForPlane(&map.planes[node->planenum]);
side = 0; // shut up compiler warning
for (p = node->portals; p; p = p->next[side]) {
clipplane = map.planes[p->planenum];
if (p->nodes[0] == node)
side = 0;
else if (p->nodes[1] == node) {
clipplane.dist = -clipplane.dist;
VectorSubtract(vec3_origin, clipplane.normal, clipplane.normal);
side = 1;
} else
Error(errMislinkedPortal);
w = ClipWinding(w, &clipplane, true);
if (!w) {
Message(msgWarning, warnPortalClippedAway);
break;
}
}
if (w) {
// if the plane was not clipped on all sides, there was an error
new_portal->winding = w;
AddPortalToNodes(new_portal, f, b);
}
// partition the portals
for (p = node->portals; p; p = next_portal) {
if (p->nodes[0] == node)
side = 0;
else if (p->nodes[1] == node)
side = 1;
else
Error(errMislinkedPortal);
next_portal = p->next[side];
other_node = p->nodes[!side];
RemovePortalFromNode(p, p->nodes[0]);
RemovePortalFromNode(p, p->nodes[1]);
// cut the portal into two portals, one on each side of the cut plane
DivideWinding(p->winding, plane, &frontwinding, &backwinding);
if (!frontwinding) {
if (side == 0)
AddPortalToNodes(p, b, other_node);
else
AddPortalToNodes(p, other_node, b);
continue;
}
if (!backwinding) {
if (side == 0)
AddPortalToNodes(p, f, other_node);
else
AddPortalToNodes(p, other_node, f);
continue;
}
// the winding is split
new_portal = AllocMem(PORTAL, 1, true);
*new_portal = *p;
new_portal->winding = backwinding;
FreeMem(p->winding, WINDING, 1);
p->winding = frontwinding;
if (side == 0) {
AddPortalToNodes(p, f, other_node);
AddPortalToNodes(new_portal, b, other_node);
} else {
AddPortalToNodes(p, other_node, f);
AddPortalToNodes(new_portal, other_node, b);
}
}
// Display progress
iNodesDone++;
Message(msgPercent, iNodesDone, splitnodes);
CutNodePortals_r(f);
CutNodePortals_r(b);
}
/*
==================
PortalizeWorld
Builds the exact polyhedrons for the nodes and leafs
==================
*/
void
PortalizeWorld(const mapentity_t *ent, node_t *headnode, const int hullnum)
{
Message(msgProgress, "Portalize");
iNodesDone = 0;
MakeHeadnodePortals(ent, headnode);
CutNodePortals_r(headnode);
if (hullnum)
return;
// save portal file for vis tracing
WritePortalfile(headnode);
Message(msgStat, "%5i vis leafs", num_visleafs);
Message(msgStat, "%5i vis portals", num_visportals);
}
/*
==================
FreeAllPortals
==================
*/
void
FreeAllPortals(node_t *node)
{
portal_t *p, *nextp;
if (!node->contents) {
FreeAllPortals(node->children[0]);
FreeAllPortals(node->children[1]);
}
for (p = node->portals; p; p = nextp) {
if (p->nodes[0] == node)
nextp = p->next[0];
else
nextp = p->next[1];
RemovePortalFromNode(p, p->nodes[0]);
RemovePortalFromNode(p, p->nodes[1]);
FreeMem(p->winding, WINDING, 1);
FreeMem(p, PORTAL, 1);
}
node->portals = NULL;
}
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