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ericw-tools/qbsp/portals.cc

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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/brush.hh>
#include <qbsp/portals.hh>
#include <qbsp/map.hh>
#include <qbsp/brushbsp.hh>
#include <qbsp/qbsp.hh>
#include <qbsp/outside.hh>
#include <qbsp/tree.hh>
// TEMP
#include <qbsp/writebsp.hh>
#include <atomic>
#include "tbb/task_group.h"
contentflags_t ClusterContents(const node_t *node)
{
/* Pass the leaf contents up the stack */
if (node->is_leaf)
return node->contents;
return qbsp_options.target_game->cluster_contents(
ClusterContents(node->children[0].get()), ClusterContents(node->children[1].get()));
}
/*
=============
Portal_VisFlood
Returns true if the portal is empty or translucent, allowing
the PVS calculation to see through it.
The nodes on either side of the portal may actually be clusters,
not leafs, so all contents should be ored together
=============
*/
bool Portal_VisFlood(const portal_t *p)
{
if (!p->onnode) {
return false; // to global outsideleaf
}
contentflags_t contents0 = ClusterContents(p->nodes[0]);
contentflags_t contents1 = ClusterContents(p->nodes[1]);
/* Can't see through func_illusionary_visblocker */
if (contents0.illusionary_visblocker || contents1.illusionary_visblocker)
return false;
// Check per-game visibility
return qbsp_options.target_game->portal_can_see_through(
contents0, contents1, qbsp_options.transwater.value(), qbsp_options.transsky.value());
}
/*
===============
Portal_EntityFlood
The entity flood determines which areas are
"outside" on the map, which are then filled in.
Flowing from side s to side !s
===============
*/
bool Portal_EntityFlood(const portal_t *p, int32_t s)
{
if (!p->nodes[0]->is_leaf || !p->nodes[1]->is_leaf) {
FError("Portal_EntityFlood: not a leaf");
}
// can never cross to a solid
if (p->nodes[0]->contents.is_any_solid(qbsp_options.target_game) ||
p->nodes[1]->contents.is_any_solid(qbsp_options.target_game)) {
return false;
}
// can flood through everything else
return true;
}
/*
=============
AddPortalToNodes
=============
*/
static void AddPortalToNodes(portal_t *p, node_t *front, node_t *back)
{
if (p->nodes[0] || p->nodes[1])
FError("portal already included");
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)
FError("Portal not in leaf");
if (t == portal)
break;
if (t->nodes[0] == l)
pp = &t->next[0];
else if (t->nodes[1] == l)
pp = &t->next[1];
else
FError("Portal not bounding leaf");
}
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
================
*/
void MakeHeadnodePortals(tree_t *tree)
{
int i, j, n;
portal_t *p, *portals[6];
qplane3d bplanes[6];
// pad with some space so there will never be null volume leafs
aabb3d bounds = tree->bounds.grow(SIDESPACE);
tree->outside_node.is_leaf = true;
tree->outside_node.contents = qbsp_options.target_game->create_solid_contents();
tree->outside_node.portals = NULL;
// create 6 portals forming a cube around the bounds of the map.
// these portals will have `outside_node` on one side, and headnode on the other.
for (i = 0; i < 3; i++)
for (j = 0; j < 2; j++) {
n = j * 3 + i;
p = tree->create_portal();
portals[n] = p;
qplane3d &pl = bplanes[n] = {};
if (j) {
pl.normal[i] = -1;
pl.dist = -bounds[j][i];
} else {
pl.normal[i] = 1;
pl.dist = bounds[j][i];
}
bool side = p->plane.set_plane(pl, true);
p->winding = BaseWindingForPlane(pl);
if (side) {
AddPortalToNodes(p, &tree->outside_node, tree->headnode.get());
} else {
AddPortalToNodes(p, tree->headnode.get(), &tree->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 = portals[i]->winding->clip(bplanes[j], qbsp_options.epsilon.value(), true)[SIDE_FRONT];
}
}
}
//============================================================================
/*
================
BaseWindingForNode
Creates a winding from the given node plane, clipped by all parent nodes.
================
*/
constexpr vec_t BASE_WINDING_EPSILON = 0.001;
constexpr vec_t SPLIT_WINDING_EPSILON = 0.001;
std::optional<winding_t> BaseWindingForNode(node_t *node)
{
std::optional<winding_t> w = BaseWindingForPlane(node->plane);
// clip by all the parents
for (node_t *np = node->parent; np && w;) {
const planeside_t keep = (np->children[0].get() == node) ? SIDE_FRONT : SIDE_BACK;
w = w->clip(np->plane, BASE_WINDING_EPSILON, false)[keep];
node = np;
np = np->parent;
}
return w;
}
/*
==================
MakeNodePortal
create the new portal by taking the full plane winding for the cutting plane
and clipping it by all of parents of this node, as well as all the other
portals in the node.
==================
*/
void MakeNodePortal(tree_t *tree, node_t *node, portalstats_t &stats)
{
auto w = BaseWindingForNode(node);
// clip the portal by all the other portals in the node
int side = -1;
for (auto *p = node->portals; p && w; p = p->next[side]) {
qplane3d plane;
if (p->nodes[0] == node) {
side = 0;
plane = p->plane;
} else if (p->nodes[1] == node) {
side = 1;
plane = -p->plane;
} else {
Error("CutNodePortals_r: mislinked portal");
}
w = w->clip(plane, 0.1, false)[SIDE_FRONT];
}
if (!w) {
return;
}
if (WindingIsTiny(*w)) {
stats.c_tinyportals++;
return;
}
portal_t *new_portal = tree->create_portal();
new_portal->plane = node->plane;
new_portal->onnode = node;
new_portal->winding = w;
AddPortalToNodes(new_portal, node->children[0].get(), node->children[1].get());
}
/*
==============
SplitNodePortals
Move or split the portals that bound node so that the node's
children have portals instead of node.
==============
*/
void SplitNodePortals(tree_t *tree, node_t *node, portalstats_t &stats)
{
const auto &plane = node->plane;
node_t *f = node->children[0].get();
node_t *b = node->children[1].get();
portal_t *next_portal = nullptr;
for (portal_t *p = node->portals; p; p = next_portal) {
planeside_t side;
if (p->nodes[SIDE_FRONT] == node)
side = SIDE_FRONT;
else if (p->nodes[SIDE_BACK] == node)
side = SIDE_BACK;
else
FError("CutNodePortals_r: mislinked portal");
next_portal = p->next[side];
node_t *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
//
auto [frontwinding, backwinding] = p->winding->clip(plane, SPLIT_WINDING_EPSILON, true);
if (frontwinding && WindingIsTiny(*frontwinding)) {
frontwinding = {};
stats.c_tinyportals++;
}
if (backwinding && WindingIsTiny(*backwinding)) {
backwinding = {};
stats.c_tinyportals++;
}
if (!frontwinding && !backwinding) { // tiny windings on both sides
continue;
}
if (!frontwinding) {
if (side == SIDE_FRONT)
AddPortalToNodes(p, b, other_node);
else
AddPortalToNodes(p, other_node, b);
continue;
}
if (!backwinding) {
if (side == SIDE_FRONT)
AddPortalToNodes(p, f, other_node);
else
AddPortalToNodes(p, other_node, f);
continue;
}
// the winding is split
portal_t *new_portal = tree->create_portal();
*new_portal = *p;
new_portal->winding = backwinding;
p->winding = frontwinding;
if (side == SIDE_FRONT) {
AddPortalToNodes(p, f, other_node);
AddPortalToNodes(new_portal, b, other_node);
} else {
AddPortalToNodes(p, other_node, f);
AddPortalToNodes(new_portal, other_node, b);
}
}
node->portals = nullptr;
}
/*
================
CalcNodeBounds
================
*/
void CalcNodeBounds(node_t *node)
{
// calc mins/maxs for both leafs and nodes
node->bounds = aabb3d{};
for (portal_t *p = node->portals; p;) {
int s = (p->nodes[1] == node);
for (auto &point : *p->winding) {
node->bounds += point;
}
p = p->next[s];
}
}
/*
==================
MakeTreePortals_r
==================
*/
void MakeTreePortals_r(tree_t *tree, node_t *node, portalstats_t &stats)
{
CalcNodeBounds(node);
if (node->bounds.mins()[0] >= node->bounds.maxs()[0]) {
logging::print("WARNING: node without a volume\n");
// fixme-brushbsp: added this to work around leafs with no portals showing up in "qbspfeatures.map" among other
// test maps. Not sure if correct or there's another underlying problem.
node->bounds = {node->parent->bounds.mins(), node->parent->bounds.mins()};
}
for (int i = 0; i < 3; i++) {
if (fabs(node->bounds.mins()[i]) > qbsp_options.worldextent.value()) {
logging::print("WARNING: node with unbounded volume\n");
break;
}
}
if (node->is_leaf) {
return;
}
MakeNodePortal(tree, node, stats);
SplitNodePortals(tree, node, stats);
MakeTreePortals_r(tree, node->children[0].get(), stats);
MakeTreePortals_r(tree, node->children[1].get(), stats);
}
/*
==================
MakeTreePortals
==================
*/
void MakeTreePortals(tree_t *tree)
{
FreeTreePortals(tree);
AssertNoPortals(tree);
portalstats_t stats{};
MakeHeadnodePortals(tree);
MakeTreePortals_r(tree, tree->headnode.get(), stats);
logging::print(logging::flag::STAT, " {:8} tiny portals\n", stats.c_tinyportals);
}
static void AssertNoPortals_r(node_t *node)
{
Q_assert(!node->portals);
if (!node->is_leaf) {
AssertNoPortals_r(node->children[0].get());
AssertNoPortals_r(node->children[1].get());
}
}
void AssertNoPortals(tree_t *tree)
{
AssertNoPortals_r(tree->headnode.get());
Q_assert(!tree->outside_node.portals);
Q_assert(tree->portals.empty());
}
/*
=========================================================
FLOOD AREAS
=========================================================
*/
static void ApplyArea_r(node_t *node)
{
node->area = map.c_areas;
if (!node->is_leaf) {
ApplyArea_r(node->children[0].get());
ApplyArea_r(node->children[1].get());
}
}
static mapentity_t *AreanodeEntityForLeaf(node_t *node)
{
// if detail cluster, search the children recursively
if (!node->is_leaf) {
if (auto *child0result = AreanodeEntityForLeaf(node->children[0].get()); child0result) {
return child0result;
}
return AreanodeEntityForLeaf(node->children[1].get());
}
for (auto &brush : node->original_brushes) {
if (brush->func_areaportal) {
return brush->func_areaportal;
}
}
return nullptr;
}
/*
=============
FloodAreas_r
=============
*/
static void FloodAreas_r(node_t *node)
{
if ((node->is_leaf || node->detail_separator) && (ClusterContents(node).native & Q2_CONTENTS_AREAPORTAL)) {
// grab the func_areanode entity
mapentity_t *entity = AreanodeEntityForLeaf(node);
if (entity == nullptr) {
logging::print("WARNING: areaportal contents in node, but no entity found {} -> {}\n", node->bounds.mins(),
node->bounds.maxs());
return;
}
// this node is part of an area portal;
// if the current area has allready touched this
// portal, we are done
if (entity->portalareas[0] == map.c_areas || entity->portalareas[1] == map.c_areas)
return;
// note the current area as bounding the portal
if (entity->portalareas[1]) {
logging::print("WARNING: areaportal entity {} touches > 2 areas\n Entity Bounds: {} -> {}\n",
entity - map.entities.data(), entity->bounds.mins(), entity->bounds.maxs());
return;
}
if (entity->portalareas[0])
entity->portalareas[1] = map.c_areas;
else
entity->portalareas[0] = map.c_areas;
return;
}
if (node->area)
return; // already got it
node->area = map.c_areas;
// propagate area assignment to descendants if we're a cluster
if (!node->is_leaf) {
ApplyArea_r(node);
}
int32_t s;
for (portal_t *p = node->portals; p; p = p->next[s]) {
s = (p->nodes[1] == node);
#if 0
if (p->nodes[!s]->occupied)
continue;
#endif
if (!Portal_EntityFlood(p, s))
continue;
FloodAreas_r(p->nodes[!s]);
}
}
/*
=============
FindAreas_r
Just decend the tree, and for each node that hasn't had an
area set, flood fill out from there
=============
*/
static void FindAreas(node_t *node)
{
auto leafs = FindOccupiedClusters(node);
for (auto *leaf : leafs) {
if (leaf->area)
continue;
// area portals are always only flooded into, never
// out of
if (ClusterContents(leaf).native & Q2_CONTENTS_AREAPORTAL)
continue;
map.c_areas++;
FloodAreas_r(leaf);
}
}
/*
=============
SetAreaPortalAreas_r
Just decend the tree, and for each node that hasn't had an
area set, flood fill out from there
=============
*/
static void SetAreaPortalAreas_r(node_t *node)
{
if (!node->is_leaf) {
SetAreaPortalAreas_r(node->children[0].get());
SetAreaPortalAreas_r(node->children[1].get());
return;
}
if (node->contents.native != Q2_CONTENTS_AREAPORTAL)
return;
if (node->area)
return; // already set
// grab the func_areanode entity
mapentity_t *entity = AreanodeEntityForLeaf(node);
if (!entity) {
logging::print("WARNING: areaportal missing for node: {} -> {}\n", node->bounds.mins(), node->bounds.maxs());
return;
}
node->area = entity->portalareas[0];
if (!entity->portalareas[1]) {
logging::print("WARNING: areaportal entity {} with targetname {} doesn't touch two areas\n Node bounds: {} -> {}\n",
entity - map.entities.data(), entity->epairs.get("targetname"), node->bounds.mins(), node->bounds.maxs());
return;
}
}
/*
=============
EmitAreaPortals
=============
*/
void EmitAreaPortals(node_t *headnode)
{
logging::print(logging::flag::PROGRESS, "---- {} ----\n", __func__);
map.bsp.dareaportals.emplace_back();
map.bsp.dareas.emplace_back();
for (size_t i = 1; i <= map.c_areas; i++) {
darea_t &area = map.bsp.dareas.emplace_back();
area.firstareaportal = map.bsp.dareaportals.size();
for (auto &e : map.entities) {
if (!e.areaportalnum)
continue;
dareaportal_t dp = {};
if (e.portalareas[0] == i) {
dp.portalnum = e.areaportalnum;
dp.otherarea = e.portalareas[1];
} else if (e.portalareas[1] == i) {
dp.portalnum = e.areaportalnum;
dp.otherarea = e.portalareas[0];
}
size_t j = 0;
for (; j < map.bsp.dareaportals.size(); j++) {
if (map.bsp.dareaportals[j] == dp)
break;
}
if (j == map.bsp.dareaportals.size())
map.bsp.dareaportals.push_back(dp);
}
area.numareaportals = map.bsp.dareaportals.size() - area.firstareaportal;
}
logging::print(logging::flag::STAT, "{:5} numareas\n", map.bsp.dareas.size());
logging::print(logging::flag::STAT, "{:5} numareaportals\n", map.bsp.dareaportals.size());
}
/*
=============
FloodAreas
Mark each leaf with an area, bounded by CONTENTS_AREAPORTAL
=============
*/
void FloodAreas(mapentity_t *entity, node_t *headnode)
{
logging::print(logging::flag::PROGRESS, "---- {} ----\n", __func__);
FindAreas(headnode);
SetAreaPortalAreas_r(headnode);
logging::print(logging::flag::STAT, "{:5} areas\n", map.c_areas);
}
//==============================================================
/*
============
FindPortalSide
Finds a brush side to use for texturing the given portal
============
*/
static void FindPortalSide(portal_t *p)
{
// decide which content change is strongest
// solid > lava > water, etc
// if either is "_noclipfaces" then we don't require a content change
contentflags_t viscontents =
qbsp_options.target_game->portal_visible_contents(p->nodes[0]->contents, p->nodes[1]->contents);
if (viscontents.is_empty(qbsp_options.target_game))
return;
// bestside[0] is the brushside visible on portal side[0] which is the positive side of the plane, always
side_t *bestside[2] = {nullptr, nullptr};
float bestdot = 0;
const qbsp_plane_t &p1 = p->onnode->plane;
// check brushes on both sides of the portal
for (int j = 0; j < 2; j++) {
node_t *n = p->nodes[j];
// iterate the n->original_brushes vector in reverse order, so later brushes
// in the map file order are prioritized
for (auto it = n->original_brushes.rbegin(); it != n->original_brushes.rend(); ++it) {
auto *brush = *it;
const bool generate_outside_face =
qbsp_options.target_game->portal_generates_face(viscontents, brush->contents, SIDE_FRONT);
const bool generate_inside_face =
qbsp_options.target_game->portal_generates_face(viscontents, brush->contents, SIDE_BACK);
if (!(generate_outside_face || generate_inside_face)) {
continue;
}
for (auto &side : brush->sides) {
if (side.bevel)
continue;
// fixme-brushbsp: restore
// if (!side.visible)
// continue; // non-visible
if (qv::epsilonEqual(side.plane, p1)) {
// exact match (undirectional)
// because the brush is on j of the positive plane, the brushside must be facing away from j
Q_assert(side.plane_flipped == !j);
// see which way(s) we want to generate faces - we could be a brush on either side of
// the portal, generating either a outward face (common case) or an inward face (liquids) or both.
if (generate_outside_face) {
if (!bestside[!j]) {
bestside[!j] = &side;
}
}
if (generate_inside_face) {
if (!bestside[j]) {
bestside[j] = &side;
}
}
break;
}
// see how close the match is
// fixme-brushbsp: verify that this actually works, restore it
// const auto &p2 = side.plane;
// double dot = qv::dot(p1.normal, p2.normal);
// if (dot > bestdot) {
// bestdot = dot;
// bestside[j] = &side;
// }
}
}
}
if (!bestside[0] && !bestside[1])
logging::print("WARNING: side not found for portal\n");
p->sidefound = true;
for (int i = 0; i < 2; ++i) {
p->sides[i] = bestside[i];
}
}
/*
===============
MarkVisibleSides_r
===============
*/
static void MarkVisibleSides_r(node_t *node)
{
if (!node->is_leaf) {
MarkVisibleSides_r(node->children[0].get());
MarkVisibleSides_r(node->children[1].get());
return;
}
// empty leafs are never boundary leafs
if (node->contents.is_empty(qbsp_options.target_game))
return;
// see if there is a visible face
int s;
for (portal_t *p = node->portals; p; p = p->next[!s]) {
s = (p->nodes[0] == node);
if (!p->onnode)
continue; // edge of world
if (!p->sidefound)
FindPortalSide(p);
for (int i = 0; i < 2; ++i) {
if (p->sides[i]) {
p->sides[i]->visible = true;
}
}
}
}
/*
=============
MarkVisibleSides
=============
*/
void MarkVisibleSides(tree_t *tree, mapentity_t *entity)
{
logging::print(logging::flag::PROGRESS, "--- {} ---\n", __func__);
// clear all the visible flags
for (auto &brush : entity->brushes) {
for (auto &face : brush->sides) {
face.visible = false;
}
}
// set visible flags on the sides that are used by portals
MarkVisibleSides_r(tree->headnode.get());
}
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