514 lines
14 KiB
C++
514 lines
14 KiB
C++
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 1997 Greg Lewis
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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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#include <qbsp/map.hh>
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#include <qbsp/portals.hh>
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#include <qbsp/qbsp.hh>
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#include <climits>
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#include <vector>
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#include <set>
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#include <list>
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#include <unordered_set>
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#include <utility>
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#include <fstream>
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#include <fmt/ostream.h>
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/*
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===========
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PointInLeaf
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If the point is exactly on a node plane, prefer to return the
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opaque leaf.
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This avoids spurious leaks if a point entity is on the outside
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of the map (exactly on a brush faces) - happens in base1.map.
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===========
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*/
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static node_t *PointInLeaf(node_t *node, const qvec3d &point)
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{
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if (node->planenum == PLANENUM_LEAF || node->detail_separator) {
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return node;
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}
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auto &plane = map.planes[node->planenum];
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vec_t dist = plane.distance_to(point);
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if (dist > 0) {
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// point is on the front of the node plane
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return PointInLeaf(node->children[0], point);
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} else if (dist < 0) {
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// point is on the back of the node plane
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return PointInLeaf(node->children[1], point);
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} else {
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// point is exactly on the node plane
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node_t *front = PointInLeaf(node->children[0], point);
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node_t *back = PointInLeaf(node->children[1], point);
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// prefer the opaque one
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if (front->opaque()) {
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return front;
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}
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return back;
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}
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}
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static std::ofstream InitPtsFile(void)
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{
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options.szBSPName.replace_extension("pts");
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std::ofstream ptsfile(options.szBSPName);
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if (!ptsfile)
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FError("Failed to open {}: {}", options.szBSPName, strerror(errno));
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return ptsfile;
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}
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static void ClearOccupied_r(node_t *node)
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{
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if (node->planenum != PLANENUM_LEAF) {
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ClearOccupied_r(node->children[0]);
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ClearOccupied_r(node->children[1]);
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return;
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}
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/* leaf node */
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node->outside_distance = -1;
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node->occupant = nullptr;
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}
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/*
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=============
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Portal_Passable
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Returns true if the portal has non-opaque leafs on both sides
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from q3map
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=============
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*/
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static bool Portal_Passable(const portal_t *p)
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{
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if (p->nodes[0] == &outside_node || p->nodes[1] == &outside_node) {
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// FIXME: need this because the outside_node doesn't have PLANENUM_LEAF set
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return false;
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}
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auto leafOpaque = [](const node_t *l) {
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Q_assert(l->planenum == PLANENUM_LEAF || l->detail_separator);
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// fixme-brushbsp: confirm, why was this not needed before?
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// detail separators are treated as non-opaque because detail doesn't block vis
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// fixme-brushbsp: should probably move to node_t::opaque()
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if (l->detail_separator) {
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return false;
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}
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return l->opaque();
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};
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if (leafOpaque(p->nodes[0]) || leafOpaque(p->nodes[1]))
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return false;
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return true;
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}
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/*
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==================
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FloodFillFromOutsideNode
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Sets outside_distance on leafs reachable from the void
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preconditions:
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- all leafs have outside_distance set to -1
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==================
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*/
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static void FloodFillFromVoid()
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{
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// breadth-first search
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std::list<std::pair<node_t *, int>> queue;
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std::unordered_set<node_t *> visited_nodes;
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// push a node onto the queue which is in the void, but has a portal to outside_node
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// NOTE: remember, the headnode has no relationship to the outside of the map.
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{
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const int side = (outside_node.portals->nodes[0] == &outside_node);
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node_t *fillnode = outside_node.portals->nodes[side];
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Q_assert(fillnode != &outside_node);
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// this must be true because the map is made from closed brushes, beyion which is void
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Q_assert(!fillnode->opaque());
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queue.emplace_back(fillnode, 0);
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}
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while (!queue.empty()) {
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const auto front = queue.front();
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queue.pop_front();
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auto [node, outside_distance] = front;
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if (visited_nodes.find(node) != visited_nodes.end()) {
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// have already visited this node
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continue;
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}
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// visit node
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visited_nodes.insert(node);
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node->outside_distance = outside_distance;
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// push neighbouring nodes onto the back of the queue
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int side;
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for (portal_t *portal = node->portals; portal; portal = portal->next[!side]) {
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side = (portal->nodes[0] == node);
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if (!Portal_Passable(portal))
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continue;
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node_t *neighbour = portal->nodes[side];
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queue.emplace_back(neighbour, outside_distance + 1);
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}
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}
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}
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/*
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=============
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FindPortalsToVoid
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Given an occupied leaf, returns a list of porals leading to the void
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=============
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*/
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static std::vector<portal_t *> FindPortalsToVoid(node_t *occupied_leaf)
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{
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Q_assert(occupied_leaf->occupant != nullptr);
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Q_assert(occupied_leaf->outside_distance >= 0);
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std::vector<portal_t *> result;
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node_t *node = occupied_leaf;
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while (1) {
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// exit?
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if (node->outside_distance == 0)
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break; // this is the void leaf where we started the flood fill in FloodFillFromVoid()
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// find the next node...
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node_t *bestneighbour = nullptr;
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portal_t *bestportal = nullptr;
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int bestdist = node->outside_distance;
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int side;
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for (portal_t *portal = node->portals; portal; portal = portal->next[!side]) {
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side = (portal->nodes[0] == node);
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if (!Portal_Passable(portal))
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continue;
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node_t *neighbour = portal->nodes[side];
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Q_assert(neighbour != node);
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Q_assert(neighbour->outside_distance >= 0);
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if (neighbour->outside_distance < bestdist) {
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bestneighbour = neighbour;
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bestportal = portal;
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bestdist = neighbour->outside_distance;
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}
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}
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Q_assert(bestneighbour != nullptr);
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Q_assert(bestdist < node->outside_distance);
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// go through bestportal
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result.push_back(bestportal);
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node = bestneighbour;
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}
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return result;
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}
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/*
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===============
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WriteLeakTrail
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===============
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*/
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static void WriteLeakTrail(std::ofstream &leakfile, qvec3d point1, const qvec3d &point2)
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{
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qvec3d vector = point2 - point1;
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vec_t dist = qv::normalizeInPlace(vector);
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while (dist > options.leakdist.value()) {
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fmt::print(leakfile, "{}\n", point1);
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point1 += vector * options.leakdist.value();
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dist -= options.leakdist.value();
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}
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}
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/*
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===============
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WriteLeakLine
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leakline should be a sequence of portals leading from leakentity to the void
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===============
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*/
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static void WriteLeakLine(const mapentity_t *leakentity, const std::vector<portal_t *> &leakline)
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{
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std::ofstream ptsfile = InitPtsFile();
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qvec3d prevpt = leakentity->origin;
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for (portal_t *portal : leakline) {
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qvec3d currpt = portal->winding->center();
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// draw dots from prevpt to currpt
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WriteLeakTrail(ptsfile, prevpt, currpt);
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prevpt = currpt;
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}
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logging::print("Leak file written to {}\n", options.szBSPName);
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}
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/*
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==================
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FindOccupiedLeafs
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sets node->occupant
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==================
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*/
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std::vector<node_t *> FindOccupiedClusters(node_t *headnode)
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{
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std::vector<node_t *> result;
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for (int i = 1; i < map.numentities(); i++) {
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mapentity_t *entity = &map.entities.at(i);
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/* skip entities at (0 0 0) (bmodels) */
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if (qv::epsilonEmpty(entity->origin, EQUAL_EPSILON))
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continue;
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/* find the leaf it's in. Skip opqaue leafs */
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node_t *leaf = PointInLeaf(headnode, entity->origin);
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if (leaf->opaque())
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continue;
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/* did we already find an entity for this leaf? */
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if (leaf->occupant != nullptr)
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continue;
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leaf->occupant = entity;
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result.push_back(leaf);
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}
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return result;
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}
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//=============================================================================
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static void MarkBrushSidesInvisible(mapentity_t *entity)
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{
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for (auto &brush : entity->brushes) {
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for (auto &face : brush.faces) {
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face.visible = false;
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}
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}
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}
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/*
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==================
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MarkVisibleBrushSides
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Set f->touchesOccupiedLeaf=true on faces that are touching occupied leafs
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==================
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*/
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static void MarkVisibleBrushSides(node_t *node)
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{
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if (node->planenum != PLANENUM_LEAF) {
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MarkVisibleBrushSides(node->children[0]);
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MarkVisibleBrushSides(node->children[1]);
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return;
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}
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if (node->opaque()) {
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return;
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}
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// visit the non-opaque leaf: check all portals to neighbouring leafs.
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int side;
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for (portal_t *portal = node->portals; portal; portal = portal->next[!side]) {
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side = (portal->nodes[0] == node);
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node_t *neighbour_leaf = portal->nodes[side];
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for (auto *brush : neighbour_leaf->original_brushes) {
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for (auto &side : brush->faces) {
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if (side.planenum == portal->planenum) {
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// we've found a brush side in an original brush in the neighbouring
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// leaf, on a portal to this (non-opaque) leaf, so mark it as visible.
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side.visible = true;
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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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static void OutLeafsToSolid_r(node_t *node, int *outleafs_count)
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{
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if (node->planenum != PLANENUM_LEAF) {
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OutLeafsToSolid_r(node->children[0], outleafs_count);
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OutLeafsToSolid_r(node->children[1], outleafs_count);
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return;
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}
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// skip leafs reachable from entities
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if (node->outside_distance == -1)
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return;
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// Don't fill sky, or count solids as outleafs
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if (node->contents.is_solid(options.target_game) || node->contents.is_sky(options.target_game))
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return;
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// Finally, we can fill it in as void.
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node->contents = options.target_game->create_solid_contents();
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*outleafs_count += 1;
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}
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static int OutLeafsToSolid(node_t *node)
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{
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int count = 0;
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OutLeafsToSolid_r(node, &count);
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return count;
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}
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//=============================================================================
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/*
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===========
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FillOutside
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Goal is to mark brush sides which only touch void as "unbounded" (aka Q2 skip),
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so they're not used as BSP splitters in the next phase and basically expand outwards.
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Brush sides which cross between void and non-void are problematic for this, so
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the process looks like:
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1) flood outside -> in from beyond the map bounds and mark these leafs as solid
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Now all leafs marked "empty" are actually empty, not void.
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2) initialize all original brush sides to "invisible"
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2) flood from all empty leafs, mark original brush sides as "visible"
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This will handle partially-void, partially-in-bounds sides (they'll be marked visible).
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(doing it the opposite way, defaulting brushes to "visible" and flood-filling
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from the void wouldn't work, because brush sides that cross into the map would
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get incorrectly marked as "invisible").
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fixme-brushbsp: we'll want to do this for detail as well, which means building another set of
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portals for everything (not just structural).
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fixme-brushbsp: remember, structural covered by detail still gets marked 'visible'.
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===========
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*/
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bool FillOutside(mapentity_t *entity, node_t *node, const int hullnum)
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{
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logging::print(logging::flag::PROGRESS, "---- {} ----\n", __func__);
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/* Clear the outside filling state on all nodes */
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ClearOccupied_r(node);
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// Sets leaf->occupant
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const std::vector<node_t *> occupied_leafs = FindOccupiedClusters(node);
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if (occupied_leafs.empty()) {
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logging::print("WARNING: No entities in empty space -- no filling performed (hull {})\n", hullnum);
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return false;
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}
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// Flood fill from outside -> in.
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//
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// We tried inside -> out and it leads to things like monster boxes getting inadvertently sealed,
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// or even whole sections of the map with no point entities - problems compounded by hull expansion.
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FloodFillFromVoid();
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// check for the occupied leaf closest to the void
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int best_leak_dist = INT_MAX;
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node_t *best_leak = nullptr;
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for (node_t *leaf : occupied_leafs) {
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if (leaf->outside_distance == -1)
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continue;
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if (leaf->outside_distance < best_leak_dist) {
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best_leak_dist = leaf->outside_distance;
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best_leak = leaf;
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}
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}
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if (best_leak) {
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const auto leakline = FindPortalsToVoid(best_leak);
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mapentity_t *leakentity = best_leak->occupant;
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Q_assert(leakentity != nullptr);
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logging::print("WARNING: Reached occupant \"{}\" at ({}), no filling performed.\n",
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ValueForKey(leakentity, "classname"), leakentity->origin);
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if (map.leakfile)
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return false;
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WriteLeakLine(leakentity, leakline);
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map.leakfile = true;
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/* Get rid of the .prt file since the map has a leak */
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options.szBSPName.replace_extension("prt");
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remove(options.szBSPName);
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if (options.leaktest.value()) {
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logging::print("Aborting because -leaktest was used.\n");
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exit(1);
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}
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// clear occupied state, so areas can be flooded in Q2
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ClearOccupied_r(node);
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return false;
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}
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// change the leaf contents
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const int outleafs = OutLeafsToSolid(node);
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// See missing_face_simple.map for a test case with a brush that straddles between void and non-void
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MarkBrushSidesInvisible(entity);
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MarkVisibleBrushSides(node);
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logging::print(logging::flag::STAT, " {:8} outleafs\n", outleafs);
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return true;
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}
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