/*
============
idTraceModel::SetupPolygon
============
*/
void idTraceModel::SetupPolygon( const idWinding &w ) {
int i;
idVec3 *verts;
verts = (idVec3 *) _alloca16( w.GetNumPoints() * sizeof( idVec3 ) );
for ( i = 0; i < w.GetNumPoints(); i++ ) {
verts[i] = w[i].ToVec3();
}
SetupPolygon( verts, w.GetNumPoints() );
}
int Ray_PolygonFinish(Object *obj)
{
PolygonData *ply;
assert(obj != NULL);
assert(obj->data.polygon != NULL);
ply = obj->data.polygon;
if(ply->npts < 3)
return 0;
SetupPolygon(ply);
return 1;
}
Object *Ray_MakePolygon(float *pts, int npts)
{
Object *obj = NewObject();
if (obj != NULL)
{
PolygonData *polygon = (PolygonData *)Malloc(sizeof(PolygonData));
if (polygon != NULL)
{
if (npts >= 3)
{
polygon->npts = npts;
if((polygon->pts = (float *)Calloc(npts * 3, sizeof(float))) !=
NULL)
{
if (pts != NULL)
{
// A point list was given. Copy the points into the
// polygon point list and initialize it.
//
memcpy(polygon->pts, pts, npts * 3 * sizeof(float));
SetupPolygon(polygon);
}
}
else
{
// Alloc failed.
Ray_DeleteObject(obj);
return NULL;
}
}
else
{
// Start with an empty polygon.
// Points will be added later.
//
polygon->pts = NULL;
polygon->npts = 0;
}
obj->data.polygon = polygon;
obj->procs = &polygon_procs;
// Don't shadow test against self.
//
obj->flags |= OBJ_FLAG_NO_SELF_INTERSECT;
}
else // Alloc failed
obj = Ray_DeleteObject(obj);
}
return obj;
}
void MatrixTransformPolygon(PolygonData *p, Xform *T)
{
Vec3 V;
int i;
float *old_pts, *new_pts;
old_pts = new_pts = p->pts;
for(i = 0; i < p->npts; i++)
{
V.x = *old_pts++;
V.y = *old_pts++;
V.z = *old_pts++;
PointToWorld(&V, T);
*new_pts++ = (float)V.x;
*new_pts++ = (float)V.y;
*new_pts++ = (float)V.z;
}
SetupPolygon(p);
}
void TransformPolygon(Object *obj, Vec3 *params, int type)
{
PolygonData *p = obj->data.polygon;
Vec3 V;
int i;
float *old_pts, *new_pts;
old_pts = new_pts = p->pts;
for(i = 0; i < p->npts; i++)
{
V.x = *old_pts++;
V.y = *old_pts++;
V.z = *old_pts++;
XformVector(&V, params, type);
*new_pts++ = (float)V.x;
*new_pts++ = (float)V.y;
*new_pts++ = (float)V.z;
}
SetupPolygon(p);
}
