/*
================
idStr::Icmpn
================
*/
int idStr::Icmpn( const char* s1, const char* s2, int n )
{
int c1, c2, d;
assert( n >= 0 );
do
{
c1 = *s1++;
c2 = *s2++;
if( !n-- )
{
return 0; // strings are equal until end point
}
d = c1 - c2;
while( d )
{
if( c1 <= 'Z' && c1 >= 'A' )
{
d += ( 'a' - 'A' );
if( !d )
{
break;
}
}
if( c2 <= 'Z' && c2 >= 'A' )
{
d -= ( 'a' - 'A' );
if( !d )
{
break;
}
}
return ( INT32_SIGNBITNOTSET( d ) << 1 ) - 1;
}
}
while( c1 );
return 0; // strings are equal
}
/*
============
idTraceModel::GetPolygonArea
============
*/
float idTraceModel::GetPolygonArea( int polyNum ) const {
int i;
idVec3 base, v1, v2, cross;
float total;
const traceModelPoly_t *poly;
if ( polyNum < 0 || polyNum >= numPolys ) {
return 0.0f;
}
poly = &polys[polyNum];
total = 0.0f;
base = verts[ edges[ abs(poly->edges[0]) ].v[ INT32_SIGNBITSET( poly->edges[0] ) ] ];
for ( i = 0; i < poly->numEdges; i++ ) {
v1 = verts[ edges[ abs(poly->edges[i]) ].v[ INT32_SIGNBITSET( poly->edges[i] ) ] ] - base;
v2 = verts[ edges[ abs(poly->edges[i]) ].v[ INT32_SIGNBITNOTSET( poly->edges[i] ) ] ] - base;
cross = v1.Cross( v2 );
total += cross.Length();
}
return total * 0.5f;
}
/*
====================
idSurface_Polytope::SplitPolytope
====================
*/
int idSurface_Polytope::SplitPolytope( const idPlane &plane, const float epsilon, idSurface_Polytope **front, idSurface_Polytope **back ) const {
int side, i, j, s, v0, v1, v2, edgeNum;
idSurface *surface[2];
idSurface_Polytope *polytopeSurfaces[2], *surf;
int *onPlaneEdges[2];
onPlaneEdges[0] = (int *) _alloca( indexes.Num() / 3 * sizeof( int ) );
onPlaneEdges[1] = (int *) _alloca( indexes.Num() / 3 * sizeof( int ) );
side = Split( plane, epsilon, &surface[0], &surface[1], onPlaneEdges[0], onPlaneEdges[1] );
*front = polytopeSurfaces[0] = new (TAG_IDLIB_SURFACE) idSurface_Polytope;
*back = polytopeSurfaces[1] = new (TAG_IDLIB_SURFACE) idSurface_Polytope;
for ( s = 0; s < 2; s++ ) {
if ( surface[s] ) {
polytopeSurfaces[s] = new idSurface_Polytope( *surface[s] );
delete surface[s];
surface[s] = NULL;
}
}
*front = polytopeSurfaces[0];
*back = polytopeSurfaces[1];
if ( side != SIDE_CROSS ) {
return side;
}
// add triangles to close off the front and back polytope
for ( s = 0; s < 2; s++ ) {
surf = polytopeSurfaces[s];
edgeNum = surf->edgeIndexes[onPlaneEdges[s][0]];
v0 = surf->edges[abs(edgeNum)].verts[INT32_SIGNBITSET(edgeNum)];
v1 = surf->edges[abs(edgeNum)].verts[INT32_SIGNBITNOTSET(edgeNum)];
for ( i = 1; onPlaneEdges[s][i] >= 0; i++ ) {
for ( j = i+1; onPlaneEdges[s][j] >= 0; j++ ) {
edgeNum = surf->edgeIndexes[onPlaneEdges[s][j]];
if ( v1 == surf->edges[abs(edgeNum)].verts[INT32_SIGNBITSET(edgeNum)] ) {
v1 = surf->edges[abs(edgeNum)].verts[INT32_SIGNBITNOTSET(edgeNum)];
SwapValues( onPlaneEdges[s][i], onPlaneEdges[s][j] );
break;
}
}
}
for ( i = 2; onPlaneEdges[s][i] >= 0; i++ ) {
edgeNum = surf->edgeIndexes[onPlaneEdges[s][i]];
v1 = surf->edges[abs(edgeNum)].verts[INT32_SIGNBITNOTSET(edgeNum)];
v2 = surf->edges[abs(edgeNum)].verts[INT32_SIGNBITSET(edgeNum)];
surf->indexes.Append( v0 );
surf->indexes.Append( v1 );
surf->indexes.Append( v2 );
}
surf->GenerateEdgeIndexes();
}
return side;
}
/*
================
idCollisionModelManagerLocal::RotateTrmEdgeThroughPolygon
================
*/
void idCollisionModelManagerLocal::RotateTrmEdgeThroughPolygon( cm_traceWork_t *tw, cm_polygon_t *poly, cm_trmEdge_t *trmEdge ) {
int i, j, edgeNum;
float f1, f2, startTan, dir, tanHalfAngle;
cm_edge_t *edge;
cm_vertex_t *v1, *v2;
idVec3 collisionPoint, collisionNormal, origin, epsDir;
idPluecker epsPl;
idBounds bounds;
// if the trm is convex and the rotation axis intersects the trm
if ( tw->isConvex && tw->axisIntersectsTrm ) {
// if both points are behind the polygon the edge cannot collide within a 180 degrees rotation
if ( tw->vertices[trmEdge->vertexNum[0]].polygonSide & tw->vertices[trmEdge->vertexNum[1]].polygonSide ) {
return;
}
}
// if the trace model edge rotation bounds do not intersect the polygon bounds
if ( !trmEdge->rotationBounds.IntersectsBounds( poly->bounds ) ) {
return;
}
// edge rotation bounds should cross polygon plane
if ( trmEdge->rotationBounds.PlaneSide( poly->plane ) != SIDE_CROSS ) {
return;
}
// check edges for a collision
for ( i = 0; i < poly->numEdges; i++ ) {
edgeNum = poly->edges[i];
edge = tw->model->edges + abs(edgeNum);
// if this edge is already checked
if ( edge->checkcount == idCollisionModelManagerLocal::checkCount ) {
continue;
}
// can never collide with internal edges
if ( edge->internal ) {
continue;
}
v1 = tw->model->vertices + edge->vertexNum[INT32_SIGNBITSET( edgeNum )];
v2 = tw->model->vertices + edge->vertexNum[INT32_SIGNBITNOTSET( edgeNum )];
// edge bounds
for ( j = 0; j < 3; j++ ) {
if ( v1->p[j] > v2->p[j] ) {
bounds[0][j] = v2->p[j];
bounds[1][j] = v1->p[j];
}
else {
bounds[0][j] = v1->p[j];
bounds[1][j] = v2->p[j];
}
}
// if the trace model edge rotation bounds do not intersect the polygon edge bounds
if ( !trmEdge->rotationBounds.IntersectsBounds( bounds ) ) {
continue;
}
f1 = trmEdge->pl.PermutedInnerProduct( tw->polygonEdgePlueckerCache[i] );
// pluecker coordinate for epsilon expanded edge
epsDir = edge->normal * (CM_CLIP_EPSILON+CM_PL_RANGE_EPSILON);
epsPl.FromLine( tw->model->vertices[edge->vertexNum[0]].p + epsDir,
tw->model->vertices[edge->vertexNum[1]].p + epsDir );
f2 = trmEdge->pl.PermutedInnerProduct( epsPl );
// if the rotating edge is inbetween the polygon edge and the epsilon expanded edge
if ( ( f1 < 0.0f && f2 > 0.0f ) || ( f1 > 0.0f && f2 < 0.0f ) ) {
if ( !EdgeFurthestFromEdge( tw, trmEdge->plzaxis, v1->p, v2->p, startTan, dir ) ) {
continue;
}
if ( dir <= 0.0f ) {
// moving towards the polygon edge so stop immediately
tanHalfAngle = 0.0f;
}
else if ( idMath::Fabs( startTan ) >= tw->maxTan ) {
// never going to get beyond the start tangent during the current rotation
continue;
}
else {
// collide with the epsilon expanded edge
if ( !RotateEdgeThroughEdge(tw, trmEdge->plzaxis, v1->p + epsDir, v2->p + epsDir, idMath::Fabs( startTan ), tanHalfAngle ) ) {
tanHalfAngle = startTan;
}
}
}
else {
// collide with the epsilon expanded edge
epsDir = edge->normal * CM_CLIP_EPSILON;
if ( !RotateEdgeThroughEdge(tw, trmEdge->plzaxis, v1->p + epsDir, v2->p + epsDir, 0.0f, tanHalfAngle ) ) {
continue;
}
}
if ( idMath::Fabs( tanHalfAngle ) >= tw->maxTan ) {
continue;
}
// check if the collision is between the edge bounds
if ( !CollisionBetweenEdgeBounds( tw, trmEdge->start, trmEdge->end, v1->p, v2->p,
tanHalfAngle, collisionPoint, collisionNormal ) ) {
continue;
}
// allow rotation if the rotation axis goes through the collisionPoint
origin = tw->origin + tw->axis * ( tw->axis * ( collisionPoint - tw->origin ) );
if ( ( collisionPoint - origin ).LengthSqr() < ROTATION_AXIS_EPSILON * ROTATION_AXIS_EPSILON ) {
continue;
}
// fill in trace structure
tw->maxTan = idMath::Fabs( tanHalfAngle );
tw->trace.c.normal = collisionNormal;
tw->trace.c.normal.Normalize();
tw->trace.c.dist = tw->trace.c.normal * v1->p;
// make sure the collision plane faces the trace model
if ( (tw->trace.c.normal * trmEdge->start) - tw->trace.c.dist < 0 ) {
tw->trace.c.normal = -tw->trace.c.normal;
tw->trace.c.dist = -tw->trace.c.dist;
}
tw->trace.c.contents = poly->contents;
tw->trace.c.material = poly->material;
tw->trace.c.type = CONTACT_EDGE;
tw->trace.c.modelFeature = edgeNum;
tw->trace.c.trmFeature = trmEdge - tw->edges;
tw->trace.c.point = collisionPoint;
// if no collision can be closer
if ( tw->maxTan == 0.0f ) {
break;
}
}
}
/*
============
idTraceModel::SetupDodecahedron
============
*/
void idTraceModel::SetupDodecahedron( const idBounds &dodBounds ) {
int i, e0, e1, e2, e3, v0, v1, v2, v3, v4;
float s, d;
idVec3 a, b, c;
if ( type != TRM_DODECAHEDRON ) {
InitDodecahedron();
}
a[0] = a[1] = a[2] = 0.5773502691896257f; // 1.0f / ( 3.0f ) ^ 0.5f;
b[0] = b[1] = b[2] = 0.3568220897730899f; // ( ( 3.0f - ( 5.0f ) ^ 0.5f ) / 6.0f ) ^ 0.5f;
c[0] = c[1] = c[2] = 0.9341723589627156f; // ( ( 3.0f + ( 5.0f ) ^ 0.5f ) / 6.0f ) ^ 0.5f;
d = 0.5f / c[0];
s = ( dodBounds[1][0] - dodBounds[0][0] ) * d;
a[0] *= s;
b[0] *= s;
c[0] *= s;
s = ( dodBounds[1][1] - dodBounds[0][1] ) * d;
a[1] *= s;
b[1] *= s;
c[1] *= s;
s = ( dodBounds[1][2] - dodBounds[0][2] ) * d;
a[2] *= s;
b[2] *= s;
c[2] *= s;
offset = ( dodBounds[0] + dodBounds[1] ) * 0.5f;
// set vertices
verts[ 0].Set( offset.x + a[0], offset.y + a[1], offset.z + a[2] );
verts[ 1].Set( offset.x + a[0], offset.y + a[1], offset.z - a[2] );
verts[ 2].Set( offset.x + a[0], offset.y - a[1], offset.z + a[2] );
verts[ 3].Set( offset.x + a[0], offset.y - a[1], offset.z - a[2] );
verts[ 4].Set( offset.x - a[0], offset.y + a[1], offset.z + a[2] );
verts[ 5].Set( offset.x - a[0], offset.y + a[1], offset.z - a[2] );
verts[ 6].Set( offset.x - a[0], offset.y - a[1], offset.z + a[2] );
verts[ 7].Set( offset.x - a[0], offset.y - a[1], offset.z - a[2] );
verts[ 8].Set( offset.x + b[0], offset.y + c[1], offset.z );
verts[ 9].Set( offset.x - b[0], offset.y + c[1], offset.z );
verts[10].Set( offset.x + b[0], offset.y - c[1], offset.z );
verts[11].Set( offset.x - b[0], offset.y - c[1], offset.z );
verts[12].Set( offset.x + c[0], offset.y , offset.z + b[2] );
verts[13].Set( offset.x + c[0], offset.y , offset.z - b[2] );
verts[14].Set( offset.x - c[0], offset.y , offset.z + b[2] );
verts[15].Set( offset.x - c[0], offset.y , offset.z - b[2] );
verts[16].Set( offset.x , offset.y + b[1], offset.z + c[2] );
verts[17].Set( offset.x , offset.y - b[1], offset.z + c[2] );
verts[18].Set( offset.x , offset.y + b[1], offset.z - c[2] );
verts[19].Set( offset.x , offset.y - b[1], offset.z - c[2] );
// set polygons
for ( i = 0; i < numPolys; i++ ) {
e0 = polys[i].edges[0];
e1 = polys[i].edges[1];
e2 = polys[i].edges[2];
e3 = polys[i].edges[3];
v0 = edges[abs(e0)].v[INT32_SIGNBITSET(e0)];
v1 = edges[abs(e0)].v[INT32_SIGNBITNOTSET(e0)];
v2 = edges[abs(e1)].v[INT32_SIGNBITNOTSET(e1)];
v3 = edges[abs(e2)].v[INT32_SIGNBITNOTSET(e2)];
v4 = edges[abs(e3)].v[INT32_SIGNBITNOTSET(e3)];
// polygon plane
polys[i].normal = ( verts[v1] - verts[v0] ).Cross( verts[v2] - verts[v0] );
polys[i].normal.Normalize();
polys[i].dist = polys[i].normal * verts[v0];
// polygon bounds
polys[i].bounds[0] = polys[i].bounds[1] = verts[v0];
polys[i].bounds.AddPoint( verts[v1] );
polys[i].bounds.AddPoint( verts[v2] );
polys[i].bounds.AddPoint( verts[v3] );
polys[i].bounds.AddPoint( verts[v4] );
}
// trm bounds
bounds = dodBounds;
GenerateEdgeNormals();
}
/*
================
idAASBuild::GetFaceForPortal
================
*/
bool idAASBuild::GetFaceForPortal( idBrushBSPPortal* portal, int side, int* faceNum )
{
int i, j, v1num;
int numFaceEdges, faceEdges[MAX_POINTS_ON_WINDING];
idWinding* w;
aasFace_t face;
if( portal->GetFaceNum() > 0 )
{
if( side )
{
*faceNum = -portal->GetFaceNum();
}
else
{
*faceNum = portal->GetFaceNum();
}
return true;
}
w = portal->GetWinding();
// turn the winding into a sequence of edges
numFaceEdges = 0;
v1num = -1; // first vertex unknown
for( i = 0; i < w->GetNumPoints(); i++ )
{
GetEdge( ( *w )[i].ToVec3(), ( *w )[( i + 1 ) % w->GetNumPoints()].ToVec3(), &faceEdges[numFaceEdges], v1num );
if( faceEdges[numFaceEdges] )
{
// last vertex of this edge is the first vertex of the next edge
v1num = file->edges[abs( faceEdges[numFaceEdges] )].vertexNum[INT32_SIGNBITNOTSET( faceEdges[numFaceEdges] )];
// this edge is valid so keep it
numFaceEdges++;
}
}
// should have at least 3 edges
if( numFaceEdges < 3 )
{
return false;
}
// the polygon is invalid if some edge is found twice
for( i = 0; i < numFaceEdges; i++ )
{
for( j = i + 1; j < numFaceEdges; j++ )
{
if( faceEdges[i] == faceEdges[j] || faceEdges[i] == -faceEdges[j] )
{
return false;
}
}
}
portal->SetFaceNum( file->faces.Num() );
face.planeNum = file->planeList.FindPlane( portal->GetPlane(), AAS_PLANE_NORMAL_EPSILON, AAS_PLANE_DIST_EPSILON );
face.flags = portal->GetFlags();
face.areas[0] = face.areas[1] = 0;
face.firstEdge = file->edgeIndex.Num();
face.numEdges = numFaceEdges;
for( i = 0; i < numFaceEdges; i++ )
{
file->edgeIndex.Append( faceEdges[i] );
}
if( side )
{
*faceNum = -file->faces.Num();
}
else
{
*faceNum = file->faces.Num();
}
file->faces.Append( face );
return true;
}
/*
================
idStr::IcmpnPath
================
*/
int idStr::IcmpnPath( const char* s1, const char* s2, int n )
{
int c1, c2, d;
#if 0
//#if !defined( ID_PC_WIN )
idLib::common->Printf( "WARNING: IcmpPath used on a case-sensitive filesystem?\n" );
#endif
assert( n >= 0 );
do
{
c1 = *s1++;
c2 = *s2++;
if( !n-- )
{
return 0; // strings are equal until end point
}
d = c1 - c2;
while( d )
{
if( c1 <= 'Z' && c1 >= 'A' )
{
d += ( 'a' - 'A' );
if( !d )
{
break;
}
}
if( c1 == '\\' )
{
d += ( '/' - '\\' );
if( !d )
{
break;
}
}
if( c2 <= 'Z' && c2 >= 'A' )
{
d -= ( 'a' - 'A' );
if( !d )
{
break;
}
}
if( c2 == '\\' )
{
d -= ( '/' - '\\' );
if( !d )
{
break;
}
}
// make sure folders come first
while( c1 )
{
if( c1 == '/' || c1 == '\\' )
{
break;
}
c1 = *s1++;
}
while( c2 )
{
if( c2 == '/' || c2 == '\\' )
{
break;
}
c2 = *s2++;
}
if( c1 && !c2 )
{
return -1;
}
else if( !c1 && c2 )
{
return 1;
}
// same folder depth so use the regular compare
return ( INT32_SIGNBITNOTSET( d ) << 1 ) - 1;
}
}
while( c1 );
return 0;
}
