mirror of
https://github.com/shawns-valve/halflife.git
synced 2024-11-22 04:21:30 +00:00
433 lines
8.7 KiB
C
433 lines
8.7 KiB
C
/***
|
|
*
|
|
* Copyright (c) 1996-2002, Valve LLC. All rights reserved.
|
|
*
|
|
* This product contains software technology licensed from Id
|
|
* Software, Inc. ("Id Technology"). Id Technology (c) 1996 Id Software, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
****/
|
|
|
|
#include "bsp5.h"
|
|
|
|
|
|
node_t outside_node; // portals outside the world face this
|
|
|
|
//=============================================================================
|
|
|
|
/*
|
|
=============
|
|
AddPortalToNodes
|
|
=============
|
|
*/
|
|
void AddPortalToNodes (portal_t *p, node_t *front, node_t *back)
|
|
{
|
|
if (p->nodes[0] || p->nodes[1])
|
|
Error ("AddPortalToNode: allready 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
|
|
=============
|
|
*/
|
|
void RemovePortalFromNode (portal_t *portal, node_t *l)
|
|
{
|
|
portal_t **pp, *t;
|
|
|
|
// remove reference to the current portal
|
|
pp = &l->portals;
|
|
while (1)
|
|
{
|
|
t = *pp;
|
|
if (!t)
|
|
Error ("RemovePortalFromNode: 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
|
|
Error ("RemovePortalFromNode: 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;
|
|
}
|
|
}
|
|
|
|
//============================================================================
|
|
|
|
void PrintPortal (portal_t *p)
|
|
{
|
|
int i;
|
|
winding_t *w;
|
|
|
|
w = p->winding;
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
printf ("(%5.0f,%5.0f,%5.0f)\n",w->points[i][0]
|
|
, w->points[i][1], w->points[i][2]);
|
|
}
|
|
|
|
/*
|
|
================
|
|
MakeHeadnodePortals
|
|
|
|
The created portals will face the global outside_node
|
|
================
|
|
*/
|
|
void MakeHeadnodePortals (node_t *node, vec3_t mins, vec3_t maxs)
|
|
{
|
|
vec3_t bounds[2];
|
|
int i, j, n;
|
|
portal_t *p, *portals[6];
|
|
dplane_t bplanes[6], *pl;
|
|
|
|
Draw_ClearWindow ();
|
|
|
|
// pad with some space so there will never be null volume leafs
|
|
for (i=0 ; i<3 ; i++)
|
|
{
|
|
bounds[0][i] = mins[i] - SIDESPACE;
|
|
bounds[1][i] = maxs[i] + SIDESPACE;
|
|
}
|
|
|
|
outside_node.contents = CONTENTS_SOLID;
|
|
outside_node.portals = NULL;
|
|
|
|
for (i=0 ; i<3 ; i++)
|
|
for (j=0 ; j<2 ; j++)
|
|
{
|
|
n = j*3 + i;
|
|
|
|
p = AllocPortal ();
|
|
portals[n] = p;
|
|
|
|
pl = &bplanes[n];
|
|
memset (pl, 0, sizeof(*pl));
|
|
if (j)
|
|
{
|
|
pl->normal[i] = -1;
|
|
pl->dist = -bounds[j][i];
|
|
}
|
|
else
|
|
{
|
|
pl->normal[i] = 1;
|
|
pl->dist = bounds[j][i];
|
|
}
|
|
p->plane = *pl;
|
|
p->winding = BaseWindingForPlane (pl);
|
|
AddPortalToNodes (p, node, &outside_node);
|
|
}
|
|
|
|
// clip the basewindings by all the other planes
|
|
for (i=0 ; i<6 ; i++)
|
|
{
|
|
for (j=0 ; j<6 ; j++)
|
|
{
|
|
if (j == i)
|
|
continue;
|
|
portals[i]->winding = ClipWinding (portals[i]->winding, &bplanes[j], true);
|
|
}
|
|
}
|
|
}
|
|
|
|
//============================================================================
|
|
|
|
void CheckWindingInNode (winding_t *w, node_t *node)
|
|
{
|
|
int i, j;
|
|
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
for (j=0 ; j<3 ; j++)
|
|
if (w->points[i][j] < node->mins[j] - 1
|
|
|| w->points[i][j] > node->maxs[j] + 1)
|
|
{
|
|
printf ("WARNING: CheckWindingInNode: outside\n");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckWindingArea (winding_t *w)
|
|
{
|
|
int i;
|
|
float total, add;
|
|
vec3_t v1, v2, cross;
|
|
|
|
total = 0;
|
|
for (i=1 ; i<w->numpoints ; i++)
|
|
{
|
|
VectorSubtract (w->points[i], w->points[0], v1);
|
|
VectorSubtract (w->points[i+1], w->points[0], v2);
|
|
CrossProduct (v1, v2, cross);
|
|
add = VectorLength (cross);
|
|
total += add*0.5;
|
|
}
|
|
if (total < 16)
|
|
printf ("WARNING: winding area %f\n", total);
|
|
}
|
|
|
|
|
|
void PlaneFromWinding (winding_t *w, dplane_t *plane)
|
|
{
|
|
vec3_t v1, v2;
|
|
vec3_t plane_normal;
|
|
|
|
// calc plane
|
|
VectorSubtract (w->points[2], w->points[1], v1);
|
|
VectorSubtract (w->points[0], w->points[1], v2);
|
|
|
|
CrossProduct (v2, v1, plane_normal);
|
|
VectorNormalize (plane_normal);
|
|
VectorCopy (plane_normal, plane->normal); // change from vec_t
|
|
plane->dist = DotProduct (w->points[0], plane->normal);
|
|
}
|
|
|
|
void CheckLeafPortalConsistancy (node_t *node)
|
|
{
|
|
int side, side2;
|
|
portal_t *p, *p2;
|
|
dplane_t plane, plane2;
|
|
int i;
|
|
winding_t *w;
|
|
float dist;
|
|
|
|
side = side2 = 0; // quiet compiler warning
|
|
|
|
for (p = node->portals ; p ; p = p->next[side])
|
|
{
|
|
if (p->nodes[0] == node)
|
|
side = 0;
|
|
else if (p->nodes[1] == node)
|
|
side = 1;
|
|
else
|
|
Error ("CutNodePortals_r: mislinked portal");
|
|
CheckWindingInNode (p->winding, node);
|
|
CheckWindingArea (p->winding);
|
|
|
|
// check that the side orders are correct
|
|
plane = p->plane;
|
|
PlaneFromWinding (p->winding, &plane2);
|
|
|
|
for (p2 = node->portals ; p2 ; p2 = p2->next[side2])
|
|
{
|
|
if (p2->nodes[0] == node)
|
|
side2 = 0;
|
|
else if (p2->nodes[1] == node)
|
|
side2 = 1;
|
|
else
|
|
Error ("CutNodePortals_r: mislinked portal");
|
|
w = p2->winding;
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
dist = DotProduct (w->points[i], plane.normal) - plane.dist;
|
|
if ( (side == 0 && dist < -1) || (side == 1 && dist > 1) )
|
|
{
|
|
printf ("WARNING: portal siding direction is wrong\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
==============================================================================
|
|
|
|
PORTAL FILE GENERATION
|
|
|
|
==============================================================================
|
|
*/
|
|
|
|
#define PORTALFILE "PRT1"
|
|
|
|
FILE *pf;
|
|
int num_visleafs; // leafs the player can be in
|
|
int num_visportals;
|
|
|
|
void WriteFloat (FILE *f, vec_t v)
|
|
{
|
|
if ( fabs(v - Q_rint(v)) < ON_EPSILON )
|
|
fprintf (f,"%i ",(int)Q_rint(v));
|
|
else
|
|
fprintf (f,"%f ",v);
|
|
}
|
|
|
|
void WritePortalFile_r (node_t *node)
|
|
{
|
|
int i;
|
|
portal_t *p;
|
|
winding_t *w;
|
|
dplane_t *pl, plane2;
|
|
|
|
if (!node->contents)
|
|
{
|
|
WritePortalFile_r (node->children[0]);
|
|
WritePortalFile_r (node->children[1]);
|
|
return;
|
|
}
|
|
|
|
if (node->contents == CONTENTS_SOLID)
|
|
return;
|
|
|
|
for (p = node->portals ; p ; )
|
|
{
|
|
w = p->winding;
|
|
if (w && p->nodes[0] == node)
|
|
{
|
|
if ( (watervis && p->nodes[0]->contents != CONTENTS_SOLID && p->nodes[1]->contents != CONTENTS_SOLID)
|
|
|| (p->nodes[0]->contents == p->nodes[1]->contents) )
|
|
{
|
|
// write out to the file
|
|
|
|
// sometimes planes get turned around when they are very near
|
|
// the changeover point between different axis. interpret the
|
|
// plane the same way vis will, and flip the side orders if needed
|
|
PlaneFromWinding (w, &plane2);
|
|
if ( DotProduct (p->plane.normal, plane2.normal) < 1.0-ON_EPSILON )
|
|
{ // backwards...
|
|
fprintf (pf,"%i %i %i ",w->numpoints, p->nodes[1]->visleafnum, p->nodes[0]->visleafnum);
|
|
}
|
|
else
|
|
fprintf (pf,"%i %i %i ",w->numpoints, p->nodes[0]->visleafnum, p->nodes[1]->visleafnum);
|
|
for (i=0 ; i<w->numpoints ; i++)
|
|
{
|
|
fprintf (pf,"(");
|
|
WriteFloat (pf, w->points[i][0]);
|
|
WriteFloat (pf, w->points[i][1]);
|
|
WriteFloat (pf, w->points[i][2]);
|
|
fprintf (pf,") ");
|
|
}
|
|
fprintf (pf,"\n");
|
|
}
|
|
}
|
|
|
|
if (p->nodes[0] == node)
|
|
p = p->next[0];
|
|
else
|
|
p = p->next[1];
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
================
|
|
NumberLeafs_r
|
|
================
|
|
*/
|
|
void NumberLeafs_r (node_t *node)
|
|
{
|
|
portal_t *p;
|
|
|
|
if (!node->contents)
|
|
{ // decision node
|
|
node->visleafnum = -99;
|
|
NumberLeafs_r (node->children[0]);
|
|
NumberLeafs_r (node->children[1]);
|
|
return;
|
|
}
|
|
|
|
Draw_ClearWindow ();
|
|
DrawLeaf (node, 1);
|
|
|
|
if (node->contents == CONTENTS_SOLID)
|
|
{ // solid block, viewpoint never inside
|
|
node->visleafnum = -1;
|
|
return;
|
|
}
|
|
|
|
node->visleafnum = num_visleafs++;
|
|
|
|
for (p = node->portals ; p ; )
|
|
{
|
|
if (p->nodes[0] == node) // only write out from first leaf
|
|
{
|
|
if ( (watervis && p->nodes[0]->contents != CONTENTS_SOLID && p->nodes[1]->contents != CONTENTS_SOLID)
|
|
|| (p->nodes[0]->contents == p->nodes[1]->contents) )
|
|
num_visportals++;
|
|
p = p->next[0];
|
|
}
|
|
else
|
|
p = p->next[1];
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
================
|
|
WritePortalfile
|
|
================
|
|
*/
|
|
void WritePortalfile (node_t *headnode)
|
|
{
|
|
// set the visleafnum field in every leaf and count the total number of portals
|
|
num_visleafs = 0;
|
|
num_visportals = 0;
|
|
NumberLeafs_r (headnode);
|
|
|
|
// write the file
|
|
printf ("writing %s\n", portfilename);
|
|
pf = fopen (portfilename, "w");
|
|
if (!pf)
|
|
Error ("Error opening %s", portfilename);
|
|
|
|
fprintf (pf, "%s\n", PORTALFILE);
|
|
fprintf (pf, "%i\n", num_visleafs);
|
|
fprintf (pf, "%i\n", num_visportals);
|
|
|
|
WritePortalFile_r (headnode);
|
|
|
|
fclose (pf);
|
|
}
|
|
|
|
|
|
//===================================================
|
|
|
|
void FreePortals (node_t *node)
|
|
{
|
|
portal_t *p, *nextp;
|
|
|
|
if (node->planenum != -1)
|
|
{
|
|
FreePortals (node->children[0]);
|
|
FreePortals (node->children[1]);
|
|
return;
|
|
}
|
|
|
|
|
|
for (p=node->portals ; p ; p=nextp)
|
|
{
|
|
if (p->nodes[0] == node)
|
|
nextp = p->next[0];
|
|
else
|
|
nextp = p->next[1];
|
|
RemovePortalFromNode (p, p->nodes[0]);
|
|
RemovePortalFromNode (p, p->nodes[1]);
|
|
FreeWinding (p->winding);
|
|
FreePortal (p);
|
|
}
|
|
}
|