mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-30 08:00:51 +00:00
429 lines
9.5 KiB
C
429 lines
9.5 KiB
C
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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See file, 'COPYING', for details.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((unused)) const char rcsid[] =
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"$Id$";
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#ifdef HAVE_STRING_H
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# include "string.h"
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#endif
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#include "QF/sys.h"
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#include "bsp5.h"
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#include "options.h"
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node_t outside_node; // portals outside the world face this
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static void
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AddPortalToNodes (portal_t *p, node_t *front, node_t *back)
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{
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if (p->nodes[0] || p->nodes[1])
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Sys_Error ("AddPortalToNode: allready included");
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p->nodes[0] = front;
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p->next[0] = front->portals;
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front->portals = p;
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p->nodes[1] = back;
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p->next[1] = back->portals;
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back->portals = p;
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}
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static void
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RemovePortalFromNode (portal_t *portal, node_t *l)
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{
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portal_t **pp, *t;
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// remove reference to the current portal
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pp = &l->portals;
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while (1) {
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t = *pp;
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if (!t)
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Sys_Error ("RemovePortalFromNode: portal not in leaf");
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if (t == portal)
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break;
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if (t->nodes[0] == l)
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pp = &t->next[0];
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else if (t->nodes[1] == l)
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pp = &t->next[1];
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else
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Sys_Error ("RemovePortalFromNode: portal not bounding leaf");
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}
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if (portal->nodes[0] == l) {
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*pp = portal->next[0];
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portal->nodes[0] = NULL;
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} else if (portal->nodes[1] == l) {
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*pp = portal->next[1];
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portal->nodes[1] = NULL;
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}
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}
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/*
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MakeHeadnodePortals
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The created portals will face the global outside_node
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*/
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static void
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MakeHeadnodePortals (node_t *node)
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{
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int side, i, j, n;
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plane_t bplanes[6], *pl;
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portal_t *p, *portals[6];
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vec3_t bounds[2];
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Draw_ClearWindow ();
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// pad with some space so there will never be null volume leafs
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for (i = 0; i < 3; i++) {
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bounds[0][i] = brushset->mins[i] - SIDESPACE;
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bounds[1][i] = brushset->maxs[i] + SIDESPACE;
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}
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outside_node.contents = CONTENTS_SOLID;
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outside_node.portals = NULL;
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for (i = 0; i < 3; i++)
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for (j = 0; j < 2; j++) {
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n = j * 3 + i;
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p = AllocPortal ();
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portals[n] = p;
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pl = &bplanes[n];
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memset (pl, 0, sizeof (*pl));
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if (j) {
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pl->normal[i] = -1;
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pl->dist = -bounds[j][i];
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} else {
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pl->normal[i] = 1;
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pl->dist = bounds[j][i];
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}
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p->planenum = FindPlane (pl, &side);
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p->winding = BaseWindingForPlane (pl);
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if (side)
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AddPortalToNodes (p, &outside_node, node);
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else
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AddPortalToNodes (p, node, &outside_node);
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}
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// clip the basewindings by all the other planes
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for (i = 0; i < 6; i++) {
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for (j = 0; j < 6; j++) {
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if (j == i)
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continue;
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portals[i]->winding =
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ClipWinding (portals[i]->winding, &bplanes[j], true);
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}
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}
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}
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//============================================================================
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static void
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PlaneFromWinding (winding_t *w, plane_t *plane)
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{
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vec3_t v1, v2;
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// calc plane
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VectorSubtract (w->points[2], w->points[1], v1);
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VectorSubtract (w->points[0], w->points[1], v2);
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CrossProduct (v2, v1, plane->normal);
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_VectorNormalize (plane->normal);
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plane->dist = DotProduct (w->points[0], plane->normal);
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}
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static void
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CutNodePortals_r (node_t *node)
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{
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int side;
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node_t *f, *b, *other_node;
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plane_t *plane, clipplane;
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portal_t *p, *new_portal, *next_portal;
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winding_t *w, *frontwinding, *backwinding;
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// CheckLeafPortalConsistancy (node);
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// seperate the portals on node into it's children
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if (node->contents)
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return; // at a leaf, no more dividing
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plane = &planes[node->planenum];
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f = node->children[0];
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b = node->children[1];
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// create the new portal by taking the full plane winding for the cutting
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// plane and clipping it by all of the planes from the other portals
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new_portal = AllocPortal ();
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new_portal->planenum = node->planenum;
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w = BaseWindingForPlane (&planes[node->planenum]);
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side = 0;
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for (p = node->portals; p; p = p->next[side]) {
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clipplane = planes[p->planenum];
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if (p->nodes[0] == node)
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side = 0;
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else if (p->nodes[1] == node) {
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clipplane.dist = -clipplane.dist;
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VectorSubtract (vec3_origin, clipplane.normal, clipplane.normal);
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side = 1;
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} else
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Sys_Error ("CutNodePortals_r: mislinked portal");
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w = ClipWinding (w, &clipplane, true);
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if (!w) {
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printf ("WARNING: CutNodePortals_r:new portal was clipped away\n");
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break;
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}
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}
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if (w) {
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// if the plane was not clipped on all sides, there was an error
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new_portal->winding = w;
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AddPortalToNodes (new_portal, f, b);
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}
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// partition the portals
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for (p = node->portals; p; p = next_portal) {
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if (p->nodes[0] == node)
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side = 0;
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else if (p->nodes[1] == node)
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side = 1;
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else
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Sys_Error ("CutNodePortals_r: mislinked portal");
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next_portal = p->next[side];
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other_node = p->nodes[!side];
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RemovePortalFromNode (p, p->nodes[0]);
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RemovePortalFromNode (p, p->nodes[1]);
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// cut the portal into two portals, one on each side of the cut plane
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DivideWinding (p->winding, plane, &frontwinding, &backwinding);
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if (!frontwinding) {
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if (side == 0)
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AddPortalToNodes (p, b, other_node);
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else
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AddPortalToNodes (p, other_node, b);
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continue;
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}
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if (!backwinding) {
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if (side == 0)
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AddPortalToNodes (p, f, other_node);
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else
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AddPortalToNodes (p, other_node, f);
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continue;
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}
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// the winding is split
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new_portal = AllocPortal ();
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*new_portal = *p;
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new_portal->winding = backwinding;
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FreeWinding (p->winding);
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p->winding = frontwinding;
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if (side == 0) {
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AddPortalToNodes (p, f, other_node);
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AddPortalToNodes (new_portal, b, other_node);
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} else {
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AddPortalToNodes (p, other_node, f);
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AddPortalToNodes (new_portal, other_node, b);
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}
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}
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DrawLeaf (f, 1);
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DrawLeaf (b, 2);
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CutNodePortals_r (f);
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CutNodePortals_r (b);
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}
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/*
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PortalizeWorld
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Builds the exact polyhedrons for the nodes and leafs
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*/
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void
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PortalizeWorld (node_t *headnode)
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{
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qprintf ("----- portalize ----\n");
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MakeHeadnodePortals (headnode);
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CutNodePortals_r (headnode);
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}
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void
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FreeAllPortals (node_t *node)
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{
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portal_t *p, *nextp;
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if (!node->contents) {
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FreeAllPortals (node->children[0]);
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FreeAllPortals (node->children[1]);
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}
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for (p = node->portals; p; p = nextp) {
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if (p->nodes[0] == node)
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nextp = p->next[0];
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else
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nextp = p->next[1];
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RemovePortalFromNode (p, p->nodes[0]);
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RemovePortalFromNode (p, p->nodes[1]);
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FreeWinding (p->winding);
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FreePortal (p);
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}
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}
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// PORTAL FILE GENERATION
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#define PORTALFILE "PRT1"
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FILE *pf;
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int num_visleafs; // leafs the player can be in
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int num_visportals;
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static void
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WriteFloat (FILE *f, vec_t v)
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{
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if (fabs (v - RINT (v)) < 0.001)
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fprintf (f, "%i ", (int) RINT (v));
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else
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fprintf (f, "%f ", v);
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}
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static void
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WritePortalFile_r (node_t *node)
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{
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int i;
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plane_t *pl, plane2;
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portal_t *p;
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winding_t *w;
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if (!node->contents) {
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WritePortalFile_r (node->children[0]);
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WritePortalFile_r (node->children[1]);
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return;
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}
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if (node->contents == CONTENTS_SOLID)
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return;
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for (p = node->portals; p;) {
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w = p->winding;
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if (w && p->nodes[0] == node
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&& p->nodes[0]->contents == p->nodes[1]->contents) {
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// write out to the file
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// sometimes planes get turned around when they are very near the
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// changeover point between different axis. interpret the plane
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// the same way vis will, and flip the side orders if needed
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pl = &planes[p->planenum];
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PlaneFromWinding (w, &plane2);
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if (DotProduct (pl->normal, plane2.normal) < 0.99) { // backwards..
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fprintf (pf, "%i %i %i ", w->numpoints,
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p->nodes[1]->visleafnum, p->nodes[0]->visleafnum);
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} else
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fprintf (pf, "%i %i %i ", w->numpoints,
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p->nodes[0]->visleafnum, p->nodes[1]->visleafnum);
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for (i = 0; i < w->numpoints; i++) {
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fprintf (pf, "(");
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WriteFloat (pf, w->points[i][0]);
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WriteFloat (pf, w->points[i][1]);
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WriteFloat (pf, w->points[i][2]);
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fprintf (pf, ") ");
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}
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fprintf (pf, "\n");
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}
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if (p->nodes[0] == node)
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p = p->next[0];
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else
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p = p->next[1];
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}
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}
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static void
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NumberLeafs_r (node_t *node)
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{
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portal_t *p;
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if (!node->contents) {
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// decision node
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node->visleafnum = -99;
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NumberLeafs_r (node->children[0]);
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NumberLeafs_r (node->children[1]);
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return;
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}
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Draw_ClearWindow ();
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DrawLeaf (node, 1);
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if (node->contents == CONTENTS_SOLID) {
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// solid block, viewpoint never inside
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node->visleafnum = -1;
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return;
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}
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node->visleafnum = num_visleafs++;
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for (p = node->portals; p;) {
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if (p->nodes[0] == node) {
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// only write out from first leaf
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if (p->nodes[0]->contents == p->nodes[1]->contents)
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num_visportals++;
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p = p->next[0];
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} else
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p = p->next[1];
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}
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}
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void
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WritePortalfile (node_t *headnode)
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{
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// set the visleafnum field in every leaf and count the total number of
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// portals
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num_visleafs = 0;
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num_visportals = 0;
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NumberLeafs_r (headnode);
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// write the file
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printf ("writing %s\n", options.portfile);
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pf = fopen (options.portfile, "w");
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if (!pf)
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Sys_Error ("Error opening %s", options.portfile);
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fprintf (pf, "%s\n", PORTALFILE);
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fprintf (pf, "%i\n", num_visleafs);
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fprintf (pf, "%i\n", num_visportals);
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WritePortalFile_r (headnode);
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fclose (pf);
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}
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