434 lines
8.7 KiB
C
434 lines
8.7 KiB
C
/***
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*
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* Copyright (c) 1996-2002, Valve LLC. All rights reserved.
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*
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* This product contains software technology licensed from Id
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* Software, Inc. ("Id Technology"). Id Technology (c) 1996 Id Software, Inc.
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* All Rights Reserved.
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*
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****/
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#include "bsp5.h"
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node_t outside_node; // portals outside the world face this
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//=============================================================================
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/*
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=============
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AddPortalToNodes
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=============
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*/
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void 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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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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/*
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=============
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RemovePortalFromNode
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=============
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*/
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void 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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{
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t = *pp;
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if (!t)
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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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Error ("RemovePortalFromNode: portal not bounding leaf");
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}
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if (portal->nodes[0] == l)
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{
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*pp = portal->next[0];
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portal->nodes[0] = NULL;
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}
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else if (portal->nodes[1] == l)
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{
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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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void PrintPortal (portal_t *p)
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{
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int i;
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winding_t *w;
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w = p->winding;
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for (i=0 ; i<w->numpoints ; i++)
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printf ("(%5.0f,%5.0f,%5.0f)\n",w->points[i][0]
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, w->points[i][1], w->points[i][2]);
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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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*/
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void MakeHeadnodePortals (node_t *node, vec3_t mins, vec3_t maxs)
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{
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vec3_t bounds[2];
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int i, j, n;
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portal_t *p, *portals[6];
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dplane_t bplanes[6], *pl;
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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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{
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bounds[0][i] = mins[i] - SIDESPACE;
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bounds[1][i] = 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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{
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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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{
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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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else
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{
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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->plane = *pl;
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p->winding = BaseWindingForPlane (pl);
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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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{
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for (j=0 ; j<6 ; j++)
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{
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if (j == i)
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continue;
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portals[i]->winding = 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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void CheckWindingInNode (winding_t *w, node_t *node)
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{
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int i, j;
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for (i=0 ; i<w->numpoints ; i++)
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{
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for (j=0 ; j<3 ; j++)
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if (w->points[i][j] < node->mins[j] - 1
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|| w->points[i][j] > node->maxs[j] + 1)
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{
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printf ("WARNING: CheckWindingInNode: outside\n");
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return;
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}
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}
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}
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void CheckWindingArea (winding_t *w)
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{
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int i;
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float total, add;
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vec3_t v1, v2, cross;
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total = 0;
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for (i=1 ; i<w->numpoints ; i++)
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{
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VectorSubtract (w->points[i], w->points[0], v1);
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VectorSubtract (w->points[i+1], w->points[0], v2);
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CrossProduct (v1, v2, cross);
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add = VectorLength (cross);
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total += add*0.5;
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}
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if (total < 16)
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printf ("WARNING: winding area %f\n", total);
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}
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void PlaneFromWinding (winding_t *w, dplane_t *plane)
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{
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vec3_t v1, v2;
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vec3_t plane_normal;
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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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VectorCopy (plane_normal, plane->normal); // change from vec_t
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plane->dist = DotProduct (w->points[0], plane->normal);
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}
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void CheckLeafPortalConsistancy (node_t *node)
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{
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int side, side2;
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portal_t *p, *p2;
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dplane_t plane, plane2;
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int i;
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winding_t *w;
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float dist;
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side = side2 = 0; // quiet compiler warning
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for (p = node->portals ; p ; p = p->next[side])
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{
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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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Error ("CutNodePortals_r: mislinked portal");
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CheckWindingInNode (p->winding, node);
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CheckWindingArea (p->winding);
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// check that the side orders are correct
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plane = p->plane;
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PlaneFromWinding (p->winding, &plane2);
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for (p2 = node->portals ; p2 ; p2 = p2->next[side2])
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{
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if (p2->nodes[0] == node)
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side2 = 0;
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else if (p2->nodes[1] == node)
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side2 = 1;
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else
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Error ("CutNodePortals_r: mislinked portal");
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w = p2->winding;
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for (i=0 ; i<w->numpoints ; i++)
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{
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dist = DotProduct (w->points[i], plane.normal) - plane.dist;
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if ( (side == 0 && dist < -1) || (side == 1 && dist > 1) )
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{
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printf ("WARNING: portal siding direction is wrong\n");
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return;
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}
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}
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}
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}
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}
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/*
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==============================================================================
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PORTAL FILE GENERATION
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==============================================================================
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*/
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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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void WriteFloat (FILE *f, vec_t v)
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{
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if ( fabs(v - Q_rint(v)) < ON_EPSILON )
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fprintf (f,"%i ",(int)Q_rint(v));
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else
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fprintf (f,"%f ",v);
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}
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void WritePortalFile_r (node_t *node)
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{
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int i;
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portal_t *p;
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winding_t *w;
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dplane_t *pl, plane2;
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if (!node->contents)
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{
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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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{
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w = p->winding;
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if (w && p->nodes[0] == node)
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{
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if ( (watervis && p->nodes[0]->contents != CONTENTS_SOLID && p->nodes[1]->contents != CONTENTS_SOLID)
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|| (p->nodes[0]->contents == p->nodes[1]->contents) )
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{
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// write out to the file
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// sometimes planes get turned around when they are very near
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// the changeover point between different axis. interpret the
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// plane the same way vis will, and flip the side orders if needed
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PlaneFromWinding (w, &plane2);
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if ( DotProduct (p->plane.normal, plane2.normal) < 1.0-ON_EPSILON )
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{ // backwards...
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fprintf (pf,"%i %i %i ",w->numpoints, p->nodes[1]->visleafnum, p->nodes[0]->visleafnum);
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}
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else
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fprintf (pf,"%i %i %i ",w->numpoints, p->nodes[0]->visleafnum, p->nodes[1]->visleafnum);
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for (i=0 ; i<w->numpoints ; i++)
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{
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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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}
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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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/*
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================
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NumberLeafs_r
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================
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*/
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void 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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{
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if (p->nodes[0] == node) // only write out from first leaf
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{
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if ( (watervis && p->nodes[0]->contents != CONTENTS_SOLID && p->nodes[1]->contents != CONTENTS_SOLID)
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|| (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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}
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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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/*
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================
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WritePortalfile
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================
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*/
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void 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 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", portfilename);
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pf = fopen (portfilename, "w");
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if (!pf)
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Error ("Error opening %s", portfilename);
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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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//===================================================
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void FreePortals (node_t *node)
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{
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portal_t *p, *nextp;
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if (node->planenum != -1)
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{
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FreePortals (node->children[0]);
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FreePortals (node->children[1]);
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return;
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}
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for (p=node->portals ; p ; p=nextp)
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{
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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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