/*
==================
CM_BoxTrace
==================
*/
void CM_BoxTrace( trace_t *results, const vec3_t start, const vec3_t end,
const vec3_t mins, const vec3_t maxs,
clipHandle_t model, int brushmask) {
int i;
traceWork_t tw;
vec3_t offset;
cmodel_t *cmod;
clipMap_t *local = 0;
cmod = CM_ClipHandleToModel( model, &local );
local->checkcount++; // for multi-check avoidance
c_traces++; // for statistics, may be zeroed
// fill in a default trace
memset( &tw, 0, sizeof(tw) - sizeof(tw.trace.G2CollisionMap));
tw.trace.fraction = 1; // assume it goes the entire distance until shown otherwise
if (!local->numNodes) {
*results = tw.trace;
return; // map not loaded, shouldn't happen
}
// allow NULL to be passed in for 0,0,0
if ( !mins ) {
mins = vec3_origin;
}
if ( !maxs ) {
maxs = vec3_origin;
}
// set basic parms
tw.contents = brushmask;
// adjust so that mins and maxs are always symetric, which
// avoids some complications with plane expanding of rotated
// bmodels
for ( i = 0 ; i < 3 ; i++ ) {
offset[i] = ( mins[i] + maxs[i] ) * 0.5;
tw.size[0][i] = mins[i] - offset[i];
tw.size[1][i] = maxs[i] - offset[i];
tw.start[i] = start[i] + offset[i];
tw.end[i] = end[i] + offset[i];
}
tw.maxOffset = tw.size[1][0] + tw.size[1][1] + tw.size[1][2];
// tw.offsets[signbits] = vector to apropriate corner from origin
tw.offsets[0][0] = tw.size[0][0];
tw.offsets[0][1] = tw.size[0][1];
tw.offsets[0][2] = tw.size[0][2];
tw.offsets[1][0] = tw.size[1][0];
tw.offsets[1][1] = tw.size[0][1];
tw.offsets[1][2] = tw.size[0][2];
tw.offsets[2][0] = tw.size[0][0];
tw.offsets[2][1] = tw.size[1][1];
tw.offsets[2][2] = tw.size[0][2];
tw.offsets[3][0] = tw.size[1][0];
tw.offsets[3][1] = tw.size[1][1];
tw.offsets[3][2] = tw.size[0][2];
tw.offsets[4][0] = tw.size[0][0];
tw.offsets[4][1] = tw.size[0][1];
tw.offsets[4][2] = tw.size[1][2];
tw.offsets[5][0] = tw.size[1][0];
tw.offsets[5][1] = tw.size[0][1];
tw.offsets[5][2] = tw.size[1][2];
tw.offsets[6][0] = tw.size[0][0];
tw.offsets[6][1] = tw.size[1][1];
tw.offsets[6][2] = tw.size[1][2];
tw.offsets[7][0] = tw.size[1][0];
tw.offsets[7][1] = tw.size[1][1];
tw.offsets[7][2] = tw.size[1][2];
//
// calculate bounds
//
for ( i = 0 ; i < 3 ; i++ ) {
if ( tw.start[i] < tw.end[i] ) {
tw.bounds[0][i] = tw.start[i] + tw.size[0][i];
tw.bounds[1][i] = tw.end[i] + tw.size[1][i];
} else {
tw.bounds[0][i] = tw.end[i] + tw.size[0][i];
tw.bounds[1][i] = tw.start[i] + tw.size[1][i];
}
}
//
// check for position test special case
//
if (start[0] == end[0] && start[1] == end[1] && start[2] == end[2]) {
if ( model ) {
CM_TestInLeaf( &tw, &cmod->leaf, local );
} else {
CM_PositionTest( &tw );
}
} else {
//
// check for point special case
//
if ( tw.size[0][0] == 0 && tw.size[0][1] == 0 && tw.size[0][2] == 0 ) {
tw.isPoint = qtrue;
VectorClear( tw.extents );
} else {
tw.isPoint = qfalse;
tw.extents[0] = tw.size[1][0];
tw.extents[1] = tw.size[1][1];
tw.extents[2] = tw.size[1][2];
}
//
// general sweeping through world
//
if ( model ) {
CM_TraceToLeaf( &tw, &cmod->leaf, local );
} else {
CM_TraceThroughTree( &tw, local, 0, 0, 1, tw.start, tw.end );
}
}
// generate endpos from the original, unmodified start/end
if ( tw.trace.fraction == 1 ) {
VectorCopy (end, tw.trace.endpos);
} else {
for ( i=0 ; i<3 ; i++ ) {
tw.trace.endpos[i] = start[i] + tw.trace.fraction * (end[i] - start[i]);
}
}
*results = tw.trace;
}
void CM_RecursiveHullCheck (int num, float p1f, float p2f, vec3_t p1, vec3_t p2)
{
cnode_t *node;
cplane_t *plane;
float t1, t2, offset;
float frac, frac2;
float idist;
int i;
vec3_t mid;
int side;
float midf;
if (trace_trace.fraction <= p1f)
return; /* already hit something nearer */
/* if < 0, we are in a leaf node */
if (num < 0)
{
CM_TraceToLeaf (-1-num);
return;
}
/* find the point distances to the seperating plane
and the offset for the size of the box */
node = map_nodes + num;
plane = node->plane;
if (plane->type < 3)
{
t1 = p1[plane->type] - plane->dist;
t2 = p2[plane->type] - plane->dist;
offset = trace_extents[plane->type];
}
else
{
t1 = DotProduct (plane->normal, p1) - plane->dist;
t2 = DotProduct (plane->normal, p2) - plane->dist;
if (trace_ispoint)
offset = 0;
else
offset = (float)fabs(trace_extents[0]*plane->normal[0]) +
(float)fabs(trace_extents[1]*plane->normal[1]) +
(float)fabs(trace_extents[2]*plane->normal[2]);
}
/* see which sides we need to consider */
if (t1 >= offset && t2 >= offset)
{
CM_RecursiveHullCheck (node->children[0], p1f, p2f, p1, p2);
return;
}
if (t1 < -offset && t2 < -offset)
{
CM_RecursiveHullCheck (node->children[1], p1f, p2f, p1, p2);
return;
}
/* put the crosspoint DIST_EPSILON pixels on the near side */
if (t1 < t2)
{
idist = 1.0f/(t1-t2);
side = 1;
frac2 = (t1 + offset + DIST_EPSILON)*idist;
frac = (t1 - offset + DIST_EPSILON)*idist;
}
else if (t1 > t2)
{
idist = 1.0/(t1-t2);
side = 0;
frac2 = (t1 - offset - DIST_EPSILON)*idist;
frac = (t1 + offset + DIST_EPSILON)*idist;
}
else
{
side = 0;
frac = 1;
frac2 = 0;
}
/* move up to the node */
if (frac < 0)
frac = 0;
if (frac > 1)
frac = 1;
midf = p1f + (p2f - p1f)*frac;
for (i=0 ; i<3 ; i++)
mid[i] = p1[i] + frac*(p2[i] - p1[i]);
CM_RecursiveHullCheck (node->children[side], p1f, midf, p1, mid);
/* go past the node */
if (frac2 < 0)
frac2 = 0;
if (frac2 > 1)
frac2 = 1;
midf = p1f + (p2f - p1f)*frac2;
for (i=0 ; i<3 ; i++)
mid[i] = p1[i] + frac2*(p2[i] - p1[i]);
CM_RecursiveHullCheck (node->children[side^1], midf, p2f, mid, p2);
}
/*
================
CM_TraceToLeaf
================
*/
void CM_TraceToLeaf( traceWork_t *tw, cLeaf_t *leaf, clipMap_t *local ) {
int k;
int brushnum;
cbrush_t *b;
cPatch_t *patch;
// trace line against all brushes in the leaf
for ( k = 0 ; k < leaf->numLeafBrushes ; k++ ) {
brushnum = local->leafbrushes[leaf->firstLeafBrush+k];
b = &local->brushes[brushnum];
if ( b->checkcount == local->checkcount ) {
continue; // already checked this brush in another leaf
}
b->checkcount = local->checkcount;
if ( !(b->contents & tw->contents) ) {
continue;
}
#ifndef BSPC
#ifndef _XBOX // Removing terrain from Xbox
if ( com_terrainPhysics->integer && cmg.landScape && (b->contents & CONTENTS_TERRAIN) )
{
// Invalidate the checkcount for terrain as the terrain brush has to be processed
// many times.
b->checkcount--;
CM_TraceThroughTerrain( tw, tw->trace, b );
// If inside a terrain brush don't bother with regular brush collision
continue;
}
#endif
#endif
//if (b->contents & CONTENTS_PLAYERCLIP) continue;
CM_TraceThroughBrush( tw, b );
if ( !tw->trace.fraction ) {
return;
}
}
// trace line against all patches in the leaf
#ifdef BSPC
if (1) {
#else
if ( !cm_noCurves->integer ) {
#endif
for ( k = 0 ; k < leaf->numLeafSurfaces ; k++ ) {
#ifdef _XBOX
int index = CM_GetSurfaceIndex(leaf->firstLeafSurface + k);
patch = cmg.surfaces[ index ];
#else
patch = local->surfaces[ local->leafsurfaces[ leaf->firstLeafSurface + k ] ];
#endif
if ( !patch ) {
continue;
}
if ( patch->checkcount == local->checkcount ) {
continue; // already checked this patch in another leaf
}
patch->checkcount = local->checkcount;
if ( !(patch->contents & tw->contents) ) {
continue;
}
CM_TraceThroughPatch( tw, patch );
if ( !tw->trace.fraction ) {
return;
}
}
}
}
//=========================================================================================
/*
==================
CM_TraceThroughTree
Traverse all the contacted leafs from the start to the end position.
If the trace is a point, they will be exactly in order, but for larger
trace volumes it is possible to hit something in a later leaf with
a smaller intercept fraction.
==================
*/
void CM_TraceThroughTree( traceWork_t *tw, clipMap_t *local, int num, float p1f, float p2f, vec3_t p1, vec3_t p2) {
cNode_t *node;
cplane_t *plane;
float t1, t2, offset;
float frac, frac2;
float idist;
vec3_t mid;
int side;
float midf;
#ifdef _XBOX
if(!tr.world) {
return;
}
#endif
if (tw->trace.fraction <= p1f) {
return; // already hit something nearer
}
// if < 0, we are in a leaf node
if (num < 0) {
CM_TraceToLeaf( tw, &local->leafs[-1-num], local );
return;
}
//
// find the point distances to the seperating plane
// and the offset for the size of the box
//
node = local->nodes + num;
#ifdef _XBOX
plane = cmg.planes + tr.world->nodes[num].planeNum;
#else
plane = node->plane;
#endif
#if 0
// uncomment this to test against every leaf in the world for debugging
CM_TraceThroughTree( tw, local, node->children[0], p1f, p2f, p1, p2 );
CM_TraceThroughTree( tw, local, node->children[1], p1f, p2f, p1, p2 );
return;
#endif
// adjust the plane distance apropriately for mins/maxs
if ( plane->type < 3 ) {
t1 = p1[plane->type] - plane->dist;
t2 = p2[plane->type] - plane->dist;
offset = tw->extents[plane->type];
} else {
t1 = DotProduct (plane->normal, p1) - plane->dist;
t2 = DotProduct (plane->normal, p2) - plane->dist;
if ( tw->isPoint ) {
offset = 0;
} else {
// an axial brush right behind a slanted bsp plane
// will poke through when expanded, so adjust
// by sqrt(3)
offset = fabs(tw->extents[0]*plane->normal[0]) +
fabs(tw->extents[1]*plane->normal[1]) +
fabs(tw->extents[2]*plane->normal[2]);
offset *= 2;
#if 0
CM_TraceThroughTree( tw, local, node->children[0], p1f, p2f, p1, p2 );
CM_TraceThroughTree( tw, local, node->children[1], p1f, p2f, p1, p2 );
return;
#endif
offset = tw->maxOffset;
offset = 2048;
}
}
// see which sides we need to consider
if ( t1 >= offset + 1 && t2 >= offset + 1 ) {
CM_TraceThroughTree( tw, local, node->children[0], p1f, p2f, p1, p2 );
return;
}
if ( t1 < -offset - 1 && t2 < -offset - 1 ) {
CM_TraceThroughTree( tw, local, node->children[1], p1f, p2f, p1, p2 );
return;
}
// put the crosspoint SURFACE_CLIP_EPSILON pixels on the near side
if ( t1 < t2 ) {
idist = 1.0/(t1-t2);
side = 1;
frac2 = (t1 + offset + SURFACE_CLIP_EPSILON)*idist;
frac = (t1 - offset + SURFACE_CLIP_EPSILON)*idist;
} else if (t1 > t2) {
idist = 1.0/(t1-t2);
side = 0;
frac2 = (t1 - offset - SURFACE_CLIP_EPSILON)*idist;
frac = (t1 + offset + SURFACE_CLIP_EPSILON)*idist;
} else {
side = 0;
frac = 1;
frac2 = 0;
}
// move up to the node
if ( frac < 0 ) {
frac = 0;
}
if ( frac > 1 ) {
frac = 1;
}
midf = p1f + (p2f - p1f)*frac;
mid[0] = p1[0] + frac*(p2[0] - p1[0]);
mid[1] = p1[1] + frac*(p2[1] - p1[1]);
mid[2] = p1[2] + frac*(p2[2] - p1[2]);
CM_TraceThroughTree( tw, local, node->children[side], p1f, midf, p1, mid );
// go past the node
if ( frac2 < 0 ) {
frac2 = 0;
}
if ( frac2 > 1 ) {
frac2 = 1;
}
midf = p1f + (p2f - p1f)*frac2;
mid[0] = p1[0] + frac2*(p2[0] - p1[0]);
mid[1] = p1[1] + frac2*(p2[1] - p1[1]);
mid[2] = p1[2] + frac2*(p2[2] - p1[2]);
CM_TraceThroughTree( tw, local, node->children[side^1], midf, p2f, mid, p2 );
}
