mirror of
https://github.com/Q3Rally-Team/q3rally.git
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521 lines
11 KiB
C
521 lines
11 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, 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 Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#include "cm_local.h"
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/*
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==================
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CM_PointLeafnum_r
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==================
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*/
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int CM_PointLeafnum_r( const vec3_t p, int num ) {
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float d;
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cNode_t *node;
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cplane_t *plane;
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while (num >= 0)
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{
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node = cm.nodes + num;
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plane = node->plane;
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if (plane->type < 3)
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d = p[plane->type] - plane->dist;
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else
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d = DotProduct (plane->normal, p) - plane->dist;
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if (d < 0)
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num = node->children[1];
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else
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num = node->children[0];
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}
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c_pointcontents++; // optimize counter
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return -1 - num;
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}
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int CM_PointLeafnum( const vec3_t p ) {
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if ( !cm.numNodes ) { // map not loaded
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return 0;
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}
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return CM_PointLeafnum_r (p, 0);
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}
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/*
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======================================================================
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LEAF LISTING
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======================================================================
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*/
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void CM_StoreLeafs( leafList_t *ll, int nodenum ) {
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int leafNum;
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leafNum = -1 - nodenum;
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// store the lastLeaf even if the list is overflowed
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if ( cm.leafs[ leafNum ].cluster != -1 ) {
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ll->lastLeaf = leafNum;
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}
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if ( ll->count >= ll->maxcount) {
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ll->overflowed = qtrue;
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return;
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}
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ll->list[ ll->count++ ] = leafNum;
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}
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void CM_StoreBrushes( leafList_t *ll, int nodenum ) {
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int i, k;
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int leafnum;
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int brushnum;
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cLeaf_t *leaf;
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cbrush_t *b;
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leafnum = -1 - nodenum;
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leaf = &cm.leafs[leafnum];
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for ( k = 0 ; k < leaf->numLeafBrushes ; k++ ) {
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brushnum = cm.leafbrushes[leaf->firstLeafBrush+k];
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b = &cm.brushes[brushnum];
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if ( b->checkcount == cm.checkcount ) {
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continue; // already checked this brush in another leaf
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}
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b->checkcount = cm.checkcount;
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for ( i = 0 ; i < 3 ; i++ ) {
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if ( b->bounds[0][i] >= ll->bounds[1][i] || b->bounds[1][i] <= ll->bounds[0][i] ) {
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break;
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}
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}
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if ( i != 3 ) {
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continue;
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}
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if ( ll->count >= ll->maxcount) {
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ll->overflowed = qtrue;
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return;
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}
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((cbrush_t **)ll->list)[ ll->count++ ] = b;
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}
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#if 0
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// store patches?
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for ( k = 0 ; k < leaf->numLeafSurfaces ; k++ ) {
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patch = cm.surfaces[ cm.leafsurfaces[ leaf->firstleafsurface + k ] ];
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if ( !patch ) {
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continue;
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}
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}
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#endif
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}
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/*
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=============
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CM_BoxLeafnums
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Fills in a list of all the leafs touched
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=============
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*/
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void CM_BoxLeafnums_r( leafList_t *ll, int nodenum ) {
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cplane_t *plane;
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cNode_t *node;
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int s;
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while (1) {
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if (nodenum < 0) {
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ll->storeLeafs( ll, nodenum );
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return;
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}
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node = &cm.nodes[nodenum];
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plane = node->plane;
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s = BoxOnPlaneSide( ll->bounds[0], ll->bounds[1], plane );
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if (s == 1) {
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nodenum = node->children[0];
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} else if (s == 2) {
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nodenum = node->children[1];
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} else {
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// go down both
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CM_BoxLeafnums_r( ll, node->children[0] );
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nodenum = node->children[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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CM_BoxLeafnums
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==================
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*/
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int CM_BoxLeafnums( const vec3_t mins, const vec3_t maxs, int *list, int listsize, int *lastLeaf) {
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leafList_t ll;
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cm.checkcount++;
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VectorCopy( mins, ll.bounds[0] );
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VectorCopy( maxs, ll.bounds[1] );
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ll.count = 0;
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ll.maxcount = listsize;
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ll.list = list;
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ll.storeLeafs = CM_StoreLeafs;
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ll.lastLeaf = 0;
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ll.overflowed = qfalse;
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CM_BoxLeafnums_r( &ll, 0 );
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*lastLeaf = ll.lastLeaf;
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return ll.count;
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}
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/*
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==================
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CM_BoxBrushes
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==================
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*/
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int CM_BoxBrushes( const vec3_t mins, const vec3_t maxs, cbrush_t **list, int listsize ) {
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leafList_t ll;
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cm.checkcount++;
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VectorCopy( mins, ll.bounds[0] );
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VectorCopy( maxs, ll.bounds[1] );
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ll.count = 0;
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ll.maxcount = listsize;
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ll.list = (void *)list;
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ll.storeLeafs = CM_StoreBrushes;
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ll.lastLeaf = 0;
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ll.overflowed = qfalse;
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CM_BoxLeafnums_r( &ll, 0 );
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return ll.count;
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}
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//====================================================================
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/*
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==================
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CM_PointContents
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==================
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*/
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int CM_PointContents( const vec3_t p, clipHandle_t model ) {
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int leafnum;
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int i, k;
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int brushnum;
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cLeaf_t *leaf;
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cbrush_t *b;
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int contents;
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float d;
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cmodel_t *clipm;
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if (!cm.numNodes) { // map not loaded
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return 0;
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}
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if ( model ) {
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clipm = CM_ClipHandleToModel( model );
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leaf = &clipm->leaf;
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} else {
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leafnum = CM_PointLeafnum_r (p, 0);
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leaf = &cm.leafs[leafnum];
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}
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contents = 0;
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for (k=0 ; k<leaf->numLeafBrushes ; k++) {
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brushnum = cm.leafbrushes[leaf->firstLeafBrush+k];
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b = &cm.brushes[brushnum];
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if ( !CM_BoundsIntersectPoint( b->bounds[0], b->bounds[1], p ) ) {
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continue;
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}
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// see if the point is in the brush
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for ( i = 0 ; i < b->numsides ; i++ ) {
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d = DotProduct( p, b->sides[i].plane->normal );
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// FIXME test for Cash
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// if ( d >= b->sides[i].plane->dist ) {
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if ( d > b->sides[i].plane->dist ) {
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break;
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}
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}
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if ( i == b->numsides ) {
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contents |= b->contents;
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}
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}
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return contents;
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}
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/*
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==================
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CM_TransformedPointContents
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Handles offseting and rotation of the end points for moving and
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rotating entities
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==================
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*/
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int CM_TransformedPointContents( const vec3_t p, clipHandle_t model, const vec3_t origin, const vec3_t angles) {
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vec3_t p_l;
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vec3_t temp;
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vec3_t forward, right, up;
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// subtract origin offset
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VectorSubtract (p, origin, p_l);
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// rotate start and end into the models frame of reference
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if ( model != BOX_MODEL_HANDLE &&
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(angles[0] || angles[1] || angles[2]) )
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{
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AngleVectors (angles, forward, right, up);
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VectorCopy (p_l, temp);
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p_l[0] = DotProduct (temp, forward);
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p_l[1] = -DotProduct (temp, right);
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p_l[2] = DotProduct (temp, up);
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}
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return CM_PointContents( p_l, model );
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}
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/*
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===============================================================================
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PVS
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===============================================================================
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*/
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byte *CM_ClusterPVS (int cluster) {
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if (cluster < 0 || cluster >= cm.numClusters || !cm.vised ) {
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return cm.visibility;
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}
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return cm.visibility + cluster * cm.clusterBytes;
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}
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/*
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===============================================================================
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AREAPORTALS
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===============================================================================
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*/
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void CM_FloodArea_r( int areaNum, int floodnum) {
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int i;
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cArea_t *area;
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int *con;
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area = &cm.areas[ areaNum ];
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if ( area->floodvalid == cm.floodvalid ) {
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if (area->floodnum == floodnum)
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return;
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Com_Error (ERR_DROP, "FloodArea_r: reflooded");
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}
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area->floodnum = floodnum;
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area->floodvalid = cm.floodvalid;
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con = cm.areaPortals + areaNum * cm.numAreas;
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for ( i=0 ; i < cm.numAreas ; i++ ) {
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if ( con[i] > 0 ) {
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CM_FloodArea_r( i, floodnum );
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}
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}
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}
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/*
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====================
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CM_FloodAreaConnections
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====================
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*/
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void CM_FloodAreaConnections( void ) {
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int i;
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cArea_t *area;
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int floodnum;
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// all current floods are now invalid
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cm.floodvalid++;
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floodnum = 0;
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for (i = 0 ; i < cm.numAreas ; i++) {
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area = &cm.areas[i];
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if (area->floodvalid == cm.floodvalid) {
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continue; // already flooded into
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}
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floodnum++;
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CM_FloodArea_r (i, floodnum);
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}
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}
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/*
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====================
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CM_AdjustAreaPortalState
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====================
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*/
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void CM_AdjustAreaPortalState( int area1, int area2, qboolean open ) {
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if ( area1 < 0 || area2 < 0 ) {
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return;
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}
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if ( area1 >= cm.numAreas || area2 >= cm.numAreas ) {
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Com_Error (ERR_DROP, "CM_ChangeAreaPortalState: bad area number");
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}
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if ( open ) {
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cm.areaPortals[ area1 * cm.numAreas + area2 ]++;
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cm.areaPortals[ area2 * cm.numAreas + area1 ]++;
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} else {
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cm.areaPortals[ area1 * cm.numAreas + area2 ]--;
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cm.areaPortals[ area2 * cm.numAreas + area1 ]--;
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if ( cm.areaPortals[ area2 * cm.numAreas + area1 ] < 0 ) {
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Com_Error (ERR_DROP, "CM_AdjustAreaPortalState: negative reference count");
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}
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}
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CM_FloodAreaConnections ();
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}
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/*
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====================
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CM_AreasConnected
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====================
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*/
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qboolean CM_AreasConnected( int area1, int area2 ) {
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#ifndef BSPC
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if ( cm_noAreas->integer ) {
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return qtrue;
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}
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#endif
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if ( area1 < 0 || area2 < 0 ) {
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return qfalse;
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}
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if (area1 >= cm.numAreas || area2 >= cm.numAreas) {
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Com_Error (ERR_DROP, "area >= cm.numAreas");
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}
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if (cm.areas[area1].floodnum == cm.areas[area2].floodnum) {
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return qtrue;
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}
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return qfalse;
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}
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/*
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=================
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CM_WriteAreaBits
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Writes a bit vector of all the areas
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that are in the same flood as the area parameter
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Returns the number of bytes needed to hold all the bits.
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The bits are OR'd in, so you can CM_WriteAreaBits from multiple
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viewpoints and get the union of all visible areas.
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This is used to cull non-visible entities from snapshots
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=================
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*/
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int CM_WriteAreaBits (byte *buffer, int area)
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{
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int i;
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int floodnum;
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int bytes;
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bytes = (cm.numAreas+7)>>3;
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#ifndef BSPC
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if (cm_noAreas->integer || area == -1)
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#else
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if ( area == -1)
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#endif
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{ // for debugging, send everything
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Com_Memset (buffer, 255, bytes);
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}
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else
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{
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floodnum = cm.areas[area].floodnum;
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for (i=0 ; i<cm.numAreas ; i++)
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{
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if (cm.areas[i].floodnum == floodnum || area == -1)
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buffer[i>>3] |= 1<<(i&7);
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}
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}
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return bytes;
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}
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/*
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====================
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CM_BoundsIntersect
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====================
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*/
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qboolean CM_BoundsIntersect( const vec3_t mins, const vec3_t maxs, const vec3_t mins2, const vec3_t maxs2 )
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{
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if (maxs[0] < mins2[0] - SURFACE_CLIP_EPSILON ||
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maxs[1] < mins2[1] - SURFACE_CLIP_EPSILON ||
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maxs[2] < mins2[2] - SURFACE_CLIP_EPSILON ||
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mins[0] > maxs2[0] + SURFACE_CLIP_EPSILON ||
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mins[1] > maxs2[1] + SURFACE_CLIP_EPSILON ||
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mins[2] > maxs2[2] + SURFACE_CLIP_EPSILON)
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{
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return qfalse;
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}
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return qtrue;
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}
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/*
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====================
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CM_BoundsIntersectPoint
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====================
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*/
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qboolean CM_BoundsIntersectPoint( const vec3_t mins, const vec3_t maxs, const vec3_t point )
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{
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if (maxs[0] < point[0] - SURFACE_CLIP_EPSILON ||
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maxs[1] < point[1] - SURFACE_CLIP_EPSILON ||
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maxs[2] < point[2] - SURFACE_CLIP_EPSILON ||
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mins[0] > point[0] + SURFACE_CLIP_EPSILON ||
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mins[1] > point[1] + SURFACE_CLIP_EPSILON ||
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mins[2] > point[2] + SURFACE_CLIP_EPSILON)
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{
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return qfalse;
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}
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return qtrue;
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}
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