Descent3/editor/Group.cpp

/*
* Descent 3 
* Copyright (C) 2024 Parallax Software
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.

--- HISTORICAL COMMENTS FOLLOW ---

 * $Logfile: /DescentIII/Main/editor/Group.cpp $
 * $Revision: 1.1.1.1 $
 * $Date: 2003-08-26 03:57:38 $
 * $Author: kevinb $
 *
 * Functions for copying, pasting, etc. of groups
 *
 * $Log: not supported by cvs2svn $
 * 
 * 35    9/15/99 1:56p Matt
 * Added the option to allow rooms or groups placed on the terrain to
 * either align with the terrain or with gravity.
 * 
 * 34    8/30/99 1:01p Gwar
 * use the "true" center of faces for determining place position of a
 * group
 * 
 * 33    8/17/99 6:12p Gwar
 * handle NEWEDITOR generic object management in AttachGroup
 * 
 * 32    8/17/99 6:46a Gwar
 * added group support to NEWEDITOR
 * 
 * 31    5/08/99 1:39a Matt
 * Added a function to delete all objects of a certain type, and support
 * for placing and attaching groups to the terrain.
 * 
 * 30    4/21/99 10:19p Matt
 * DeleteGroup() wasn't setting the world changed flag
 * 
 * 29    3/15/99 1:29p Matt
 * Added objects & triggers to save/load for groups.
 * 
 * 28    1/29/99 12:48p Matt
 * Rewrote the doorway system
 * 
 * 27    1/26/99 6:02p Matt
 * Fixed (I hope) a problem with pasted object having the wrong
 * orientation.
 * 
 * 26    1/21/99 11:15p Jeff
 * pulled out some structs and defines from header files and moved them
 * into seperate header files so that multiplayer dlls don't require major
 * game headers, just those new headers.  Side effect is a shorter build
 * time.  Also cleaned up some header file #includes that weren't needed.
 * This affected polymodel.h, object.h, player.h, vecmat.h, room.h,
 * manage.h and multi.h
 * 
 * 25    1/21/99 11:34a Matt
 * Got rid of portal triggers.  Since we don't have multi-face portals, a
 * face trigger works fine for a portal.  Also fixed a few editor/trigger
 * bugs.
 * 
 * 24    1/14/99 11:06a Matt
 * Added names to triggers
 * 
 * 23    1/08/99 2:56p Samir
 * Ripped out OSIRIS1.
 * 
 * 22    12/01/98 11:17p Matt
 * Made copy/paste work with doors.
 * 
 * 21    10/08/98 4:23p Kevin
 * Changed code to comply with memory library usage. Always use mem_malloc
 * , mem_free and mem_strdup
 * 
 * 20    9/24/98 5:00p Matt
 * Improved error checking for running out of rooms.
 * 
 * 19    9/02/98 5:57p Matt
 * Added code to make faces match exactly when forming a portal.  This
 * should get rid of all remaining cracking problems.
 * 
 * 18    9/01/98 12:04p Matt
 * Ripped out multi-face portal code
 * 
 * 17    8/15/98 10:50p Matt
 * When copying a portal, copy its flags
 * 
 * 16    6/23/98 2:43p Matt
 * Changed calls to OutrageMessageBox() & Debug_MessageBox() to deal with
 * int return value (instead of bool).
 * 
 * 15    4/21/98 2:43p Matt
 * Added system to disable render updates while deleting large numbers of
 * rooms, since the mine is not stable until this operation is done.
 * 
 * 14    2/09/98 1:38p Matt
 * When pasting a group, ask the user if he also wants to paste objects
 * and triggers 
 * 
 * 13    2/04/98 6:23p Matt
 * Changed object room number to indicate a terrain cell via a flag.  Got
 * rid of the object flag which used to indicate terrain.
 * 
 * 12    1/29/98 5:50p Matt
 * Changed old camera object type to be viewer object (for editor), and
 * now camera objects will just be for game cameras.
 * 
 * 11    1/20/98 4:12p Samir
 * New script housekeeping system.
 * 
 * 10    1/15/98 7:34p Matt
 * Revamped error checking when computing face normals
 * 
 * 9     12/23/97 11:06a Samir
 * Added pserror.h
 * 
 * 8     10/13/97 6:20p Matt
 * Fixed stupid bug copying objects in group
 * 
 * 7     10/03/97 3:37p Matt
 * Fixed bug copying multiple objects in a room, and changed code to not
 * copy viewer or player objects
 * 
 * 6     9/24/97 6:18p Samir
 * Use script names instead of script id values to identify scripts.
 * 
 * 5     9/22/97 2:31p Matt
 * Made group code copy & paste objects & triggers
 * 
 * 4     9/08/97 4:05p Samir
 * Fixed some warnings and took out extranneous includes to windows.h in
 * important headers.
 * 
 * 3     9/02/97 6:42p Matt
 * Got paste & group save/load working
 * 
 * 2     8/29/97 5:45p Matt
 * Converted group code to work with rooms (unfinished)
 * 
 * 11    6/16/97 6:40p Matt
 * Fixed bug caused when Selected_segments[] was changed while
 * DeleteGroup() was indexing through it.
 * 
 * 10    6/12/97 7:17p Matt
 * Deleted now-unused RotateWorld() function
 * 
 * 9     5/23/97 5:46p Matt
 * Added SetMatrixBasedOnSide() functionality to ExtractMatrixFromSeg().
 * 
 * 8     5/13/97 11:58a Matt
 * Made group file code save & load the level file version number to use
 * when reading segments
 * 
 * 7     5/08/97 5:07p Matt
 * When rotating world, rotate the editor's wireframe window view vars
 * 
 * 6     5/08/97 4:43p Matt
 * Fixed bug when rotating objects in RotateWorld()
 * 
 * 5     5/06/97 2:26p Jason
 * fixed bug in rotate world
 * 
 * 4     5/05/97 3:57p Matt
 * Added code to rotate the mine (& the objects in it) to join with the
 * terrain.
 * 
 * 3     3/31/97 5:58p Matt
 * Revamped mine update flags
 * 
 * 2     3/12/97 3:25p Matt
 * Added funcs for cut, copy, paste, & delete, and to save and load
 * groups.
 * 
 * 1     3/11/97 9:34p Matt
 *
 * $NoKeywords: $
 */

#include "group.h"

#ifndef NEWEDITOR
#include "d3edit.h"
#else
#include "globals.h"
#endif

#include "selectedroom.h"
#include "room.h"
#include "hroom.h"
#include "erooms.h"
#include "loadlevel.h"

#ifndef NEWEDITOR
#include "moveworld.h"
#endif

#include "object.h"
#include "trigger.h"
#include "pserror.h"
#include "doorway.h"
#include "mem.h"
#include <string.h>
#include "door.h"

//Free a group.
//Parameters:	g - the group to be freed 
void FreeGroup(group *g)
{
	for (int r=0;r<g->nrooms;r++)
		FreeRoom(&g->rooms[r]);

	mem_free(g->rooms);

	if (g->nobjects)
		mem_free(g->objects);

	if (g->ntriggers)
		mem_free(g->triggers);

	mem_free(g);
}

//Copy the given list of rooms to a group
//Parameters:	nrooms - the number of rooms in list
//					roomnums - pointer to list of room numbers
//					attachroom, attachface - where group attaches when pasted 
//Returns:		pointer to group
group *CopyGroup(int nrooms,int *roomnums,int attachroom,int attachface)
{
	group *g;
	int	r;
	int	room_xlate[MAX_ROOMS];
	int	n_objects = 0, n_triggers = 0, n_doors = 0;

	//Allocate group & room arrays
	g = (group *) mem_malloc(sizeof(*g));  ASSERT(g != NULL);
	g->nrooms = nrooms;
	g->rooms = (room *) mem_malloc(sizeof(*g->rooms) * nrooms);	ASSERT(g->rooms != NULL);

	//Initialize xlate list
	for (r=0;r<MAX_ROOMS;r++)
		room_xlate[r] = -1;

	//Copy the rooms & build xlate list.  Count objects while we're at it
	for (r=0;r<nrooms;r++) {

		CopyRoom(&g->rooms[r],&Rooms[roomnums[r]]);
		room_xlate[roomnums[r]] = r;

		for(int o=Rooms[roomnums[r]].objects;o!=-1;o=Objects[o].next)
			if ((Objects[o].type != OBJ_VIEWER) && (Objects[o].type != OBJ_CAMERA) && (Objects[o].type != OBJ_PLAYER)) {
				n_objects++;
				if (Objects[o].type == OBJ_DOOR)
					n_doors++;
			}
	}

	//Add portals for rooms in the group
	for (r=0;r<nrooms;r++)
		for (int p=0;p<Rooms[roomnums[r]].num_portals;p++) {
			portal *pp = &Rooms[roomnums[r]].portals[p];
			if ((pp->croom != -1) && IsRoomSelected(pp->croom)) {
				
				//link the two rooms
				if (r < room_xlate[pp->croom]) 	//only link lower to higher, so we don't double link
					LinkRoomsSimple(g->rooms,r,pp->portal_face,room_xlate[pp->croom],Rooms[pp->croom].portals[pp->cportal].portal_face);

				//Copy the portal flags
				int new_portal_num = g->rooms[r].faces[pp->portal_face].portal_num;
				g->rooms[r].portals[new_portal_num].flags = pp->flags;
			}
		}

	//Fill in attach fields
	g->attachroom = room_xlate[attachroom];
	g->attachface = attachface;

	//Copy objects
	g->nobjects = n_objects;
	g->ndoors = n_doors;
	if (n_objects == 0)
		g->objects = NULL;
	else {
		int objnum = 0;

		//Get memory for objects
		g->objects = (object *) mem_malloc(sizeof(*g->objects) * n_objects);

		//Go through list of rooms & copy the objects
		for (r=0;r<nrooms;r++) {
			for(int o=Rooms[roomnums[r]].objects;o!=-1;o=Objects[o].next) {
				object *dest = &g->objects[objnum], *src = &Objects[o];

				if ((src->type == OBJ_VIEWER) || (src->type == OBJ_CAMERA) || (src->type == OBJ_PLAYER))
					continue;			//don't copy cameras

				//Copy some selected data
				dest->type		= src->type;
				dest->id			= src->id;
				dest->flags		= src->flags;
				dest->pos		= src->pos;
				dest->orient	= src->orient;
				dest->lifeleft	= src->lifeleft;

				dest->contains_type	= src->contains_type;
				dest->contains_id		= src->contains_id;
				dest->contains_count	= src->contains_count;

				if (src->control_type == CT_POWERUP)
					dest->ctype.powerup_info.count = src->ctype.powerup_info.count;

				if (src->type == OBJ_DOOR)
					dest->shields = src->shields;

				dest->roomnum	= r;

				objnum++;
			}
		}
	}

	//Count the triggers in the group
	for (int t=0;t<Num_triggers;t++)
		if (room_xlate[Triggers[t].roomnum] != -1)
			n_triggers++;

	//Copy triggers
	g->ntriggers = n_triggers;
	if (n_triggers == 0)
		g->triggers = NULL;
	else {
		int trignum = 0;

		//Get memory for triggers
		g->triggers = (trigger *) mem_malloc(sizeof(*g->triggers) * n_triggers);

		for (t=0;t<Num_triggers;t++)
			if (room_xlate[Triggers[t].roomnum] != -1) {
				g->triggers[trignum] = Triggers[t];
				g->triggers[trignum].roomnum = room_xlate[Triggers[t].roomnum];
				trignum++;
			}
	}


	//Return the new group
	return g;
}

extern bool Disable_editor_rendering;

//Delete the given list of rooms
//Parameters:	nrooms - the number of rooms in list
//					roomnums - pointer to list of room numbers
void DeleteGroup(int nrooms,int *roomnums)
{
	int i;
	int *troomnums;
	bool save_disable_flag = Disable_editor_rendering;

	Disable_editor_rendering = 1;

	//Make copy of list of rooms to delete.  We must do this because roomnums may be a pointer 
	//to the global Selected_list, the contents of which may be changed by DeleteRoomFromMine()
	troomnums = (int *) mem_malloc(sizeof(*troomnums) * nrooms);
	for (i=0;i<nrooms;i++)
		troomnums[i] = roomnums[i];

	//Now delete the rooms
	for (i=0;i<nrooms;i++)
		DeleteRoomFromMine(&Rooms[troomnums[i]]);

	//Free up our array
	mem_free(troomnums);

	//Regenerate external object rooms
	CreateRoomObjects();

	//Restore old flag
	Disable_editor_rendering = save_disable_flag;

	//We're done!  Update flags and leave
	World_changed = 1;
}

//Place the given group at the specified room face
//The function merely causes the group to be drawn in the editor, allowing the user to line it up
//before attaching it.  The function AttachGroup() must be called to do the actual attachment.
//Parameters:	destroomp, destside - where to place the group
//					g - the group to place
void PlaceGroup(room *destroomp,int destface,group *g)
{
	//Clear the placed room, if one exists
	Placed_room = -1;	

	ASSERT(destroomp->faces[destface].portal_num == -1);

	//Set globals
	Placed_group = g;
	Placed_room_orient.fvec = destroomp->faces[destface].normal;
	Placed_room_angle = 0;
	Placed_baseroomp = destroomp;
	Placed_baseface = destface;

	//Compute attach points on each face
#ifndef NEWEDITOR
	ComputeCenterPointOnFace(&Placed_room_attachpoint,destroomp,destface);
	ComputeCenterPointOnFace(&Placed_room_origin,&g->rooms[g->attachroom],g->attachface);
#else
	float ComputeFaceBoundingCircle(vector *center,room *rp,int facenum);
	ComputeFaceBoundingCircle(&Placed_room_attachpoint,destroomp,destface);
	ComputeFaceBoundingCircle(&Placed_room_origin,&g->rooms[g->attachroom],g->attachface);
#endif

	//Compute initial orientation matrix
	ComputePlacedRoomMatrix();

	//Set the flag
	State_changed = 1;
}

#include "terrain.h"

//Place the given group at the specified terrain cell
//The function merely causes the group to be drawn in the editor, allowing the user to line it up
//before attaching it.  The function AttachGroup() must be called to do the actual attachment.
//Parameters:	cellnum - where to place the group
//					g - the group to place
void PlaceGroupTerrain(int cellnum,group *g,bool align_to_terrain)
{
	//Clear the placed room, if one exists
	Placed_room = -1;	

	//Set globals
	Placed_group = g;
	Placed_room_angle = 0;
	Placed_baseroomp = NULL;

	if (align_to_terrain)
		Placed_room_orient.fvec = TerrainNormals[MAX_TERRAIN_LOD-1][cellnum].normal1;
	else 
		Placed_room_orient.fvec = Identity_matrix.uvec;

	//Compute attach point on terrain
	ComputeTerrainSegmentCenter(&Placed_room_attachpoint,cellnum);

	//Compute attach points on face
	ComputeCenterPointOnFace(&Placed_room_origin,&g->rooms[g->attachroom],g->attachface);

	//Compute initial orientation matrix
	ComputePlacedRoomMatrix();

	//Set the flag
	State_changed = 1;
}

//Attach the already-placed group
void AttachGroup()
{
	vector basecenter,attcenter;
	room *baseroomp,*attroomp;
	int baseface,attface;
	int room_xlate[MAX_ROOMS];
	int r;

	ASSERT(Placed_group != NULL);

	//Set some vars
	baseroomp = Placed_baseroomp;
	baseface = Placed_baseface;
	attroomp = &Placed_group->rooms[Placed_group->attachroom];
	attface = Placed_group->attachface;
	attcenter = Placed_room_origin;
	basecenter = Placed_room_attachpoint;

	//Copy the rooms into the main room list, build the xlate table, and rotate the verts
	for (r=0;r<Placed_group->nrooms;r++) {
		int roomnum;
		room *newroomp;

		//Get a new room & copy into it
		roomnum = GetFreeRoom(0);
		if (roomnum == -1) {
			OutrageMessageBox("Cannot attach group: Not enough free rooms.");
			for (int t=0;t<r;t++)		//delete the rooms we just created
				DeleteRoomFromMine(&Rooms[room_xlate[t]]);
			return;
		}
		newroomp = &Rooms[roomnum];
		CopyRoom(newroomp,&Placed_group->rooms[r]);
		room_xlate[r] = roomnum;

		//Rotate verts in the new rooms
		for (int i=0;i<newroomp->num_verts;i++)
			newroomp->verts[i] = ((newroomp->verts[i] - attcenter) * Placed_room_rotmat) + basecenter;

		//Recompute normals for the faces
		if (! ResetRoomFaceNormals(newroomp))
			Int3();	//Get Matt
	}

	//Add portals for new rooms
	for (r=0;r<Placed_group->nrooms;r++)
		for (int p=0;p<Placed_group->rooms[r].num_portals;p++) {
			portal *pp = &Placed_group->rooms[r].portals[p];
			if (r < pp->croom)		//only link lower to higher, so we don't double link
				LinkRoomsSimple(Rooms,room_xlate[r],pp->portal_face,room_xlate[pp->croom],Placed_group->rooms[pp->croom].portals[pp->cportal].portal_face);

			//Copy the portal flags
			int new_portal_num = Rooms[room_xlate[r]].faces[pp->portal_face].portal_num;
			Rooms[room_xlate[r]].portals[new_portal_num].flags = pp->flags;
		}

	//Get pointer to the placed attachroom
	room *newroomp = &Rooms[room_xlate[Placed_group->attachroom]];

	if (baseroomp) {
		//Clip the connecting faces against each other
		if (!ClipFacePair(newroomp,attface,baseroomp,baseface)) {
			OutrageMessageBox("Error making portal -- faces probably don't overlap.");
			for (r=0;r<Placed_group->nrooms;r++) 
				FreeRoom(&Rooms[room_xlate[r]]);
			return;
		}

		//Make the two faces match exactly
		MatchPortalFaces(baseroomp,baseface,newroomp,attface);

		//Link the attach room to the base room
		LinkRoomsSimple(Rooms,ROOMNUM(baseroomp),baseface,ROOMNUM(newroomp),attface);
	}

	//Paste objects
	if (Placed_group->nobjects) {
		bool place_all = 0;

		//Ask if the user wants the objects pasted
		if (Placed_group->nobjects > Placed_group->ndoors)
			place_all = (OutrageMessageBox (MBOX_YESNO, "The group you are pasting has %d (non-door) object(s).  Do you wish to paste it/them?",Placed_group->nobjects - Placed_group->ndoors) == IDYES);

  		//Add the objects (either just doors or all objects)
  		for (int o=0;o<Placed_group->nobjects;o++) {
  			object *src = &Placed_group->objects[o], *dest;

			if (place_all || (src->type == OBJ_DOOR)) {
	  			vector pos;
	  			matrix orient;
	  			int objnum;

	  			pos = ((src->pos - attcenter) * Placed_room_rotmat) + basecenter;
	  			orient = ~Placed_room_rotmat * src->orient;

	  			objnum = ObjCreate(src->type,src->id,room_xlate[src->roomnum],&pos,&orient);

#ifdef NEWEDITOR
				if (IS_GENERIC(src->type))
					LevelObjIncrementObject(src->id);
#endif

	  			dest = &Objects[objnum];

	  			dest->flags		= src->flags;
	  			dest->lifeleft	= src->lifeleft;

	  			dest->contains_type	= src->contains_type;
	  			dest->contains_id		= src->contains_id;
	  			dest->contains_count	= src->contains_count;

	  			if (dest->control_type == CT_POWERUP)
	  				dest->ctype.powerup_info.count = src->ctype.powerup_info.count;

				if (src->type == OBJ_DOOR)
					dest->shields = src->shields;
	  		}
  		}
	}

	//Paste triggers
	if (Placed_group->ntriggers) {

		//Ask if the user wants the triggers
		if (OutrageMessageBox (MBOX_YESNO, "The group you are pasting has %d trigger(s).  Do you wish to paste it/them?",Placed_group->ntriggers) == IDYES) {

			//Add the triggers
			for (int t=0;t<Placed_group->ntriggers;t++) {
				trigger *tp = &Placed_group->triggers[t];
				int trignum;

				trignum = AddTrigger("",room_xlate[tp->roomnum],tp->facenum,tp->activator,NULL);
				ASSERT(trignum != -1);

				Triggers[trignum].flags = tp->flags;
			}
		}
		else {		//Triggers not being pasted, so must delete any floating trigger faces
			for (r=0;r<Placed_group->nrooms;r++) {
				room *rp = &Rooms[room_xlate[r]];
				for (int f=0;f<rp->num_faces;f++) {
					if (rp->faces[f].flags & FF_FLOATING_TRIG)
						DeleteRoomFace(rp,f);
				}
			}
		}
	}

	//Un-place the now-attached group
	Placed_group = NULL;

	//We're done!  Update flags and leave
	World_changed = 1;
}

#define GROUP_FILE_TAG			"D3GP"
#define GROUP_FILE_VERSION		3
//Version number changes:
//0 -> 1  Save the level file version to use when reading objects, rooms, etc.
//1 -> 2  Now works for room engine
//2 -> 3  Save objects, doors, & triggers


#define cf_ReadVector(f,v)  do {(v)->x=cf_ReadFloat(f); (v)->y=cf_ReadFloat(f); (v)->z=cf_ReadFloat(f); } while (0)
#define cf_WriteVector(f,v)  do {cf_WriteFloat((f),(v)->x); cf_WriteFloat((f),(v)->y); cf_WriteFloat((f),(v)->z); } while (0)
#define cf_WriteMatrix(f,m)  do {cf_WriteVector((f),&(m)->rvec); cf_WriteVector((f),&(m)->uvec); cf_WriteVector((f),&(m)->fvec); } while (0)
#define cf_ReadMatrix(f,m)  do {cf_ReadVector((f),&(m)->rvec); cf_ReadVector((f),&(m)->uvec); cf_ReadVector((f),&(m)->fvec); } while (0)

//Saves an object for a group
void WriteGroupObject(CFILE *ofile,object *objp)
{
	cf_WriteByte(ofile,objp->type);
	cf_WriteShort(ofile,objp->id);
	cf_WriteInt(ofile,objp->flags);

	if (objp->type == OBJ_DOOR)
		cf_WriteShort(ofile,objp->shields);

	cf_WriteInt(ofile,objp->roomnum);
	cf_WriteVector(ofile,&objp->pos);
	cf_WriteMatrix(ofile,&objp->orient);

	cf_WriteByte(ofile,objp->contains_type);
	cf_WriteByte(ofile,objp->contains_id);
	cf_WriteByte(ofile,objp->contains_count);

	cf_WriteFloat(ofile,objp->lifeleft);
}

void WriteGroupTrigger(CFILE *ofile,trigger *tp)
{
	cf_WriteShort(ofile,tp->roomnum);
	cf_WriteShort(ofile,tp->facenum);
	cf_WriteShort(ofile,tp->flags);
	cf_WriteShort(ofile,tp->activator);
}

//Saves a group to disk in the given filename
void SaveGroup(char *filename,group *g)
{
	CFILE *ifile;
	int i;

	ifile = cfopen(filename,"wb");

	if (!ifile)
		return;

	//Write tag & version number
	cf_WriteBytes((uint8_t *) GROUP_FILE_TAG,4,ifile);
	cf_WriteInt(ifile,GROUP_FILE_VERSION);
	cf_WriteInt(ifile,LEVEL_FILE_VERSION);

	//Write the current list of textures
	WriteTextureList(ifile);

	//Write group info
	cf_WriteInt(ifile,g->nrooms);
	cf_WriteInt(ifile,g->attachroom);
	cf_WriteInt(ifile,g->attachface);
	cf_WriteInt(ifile,g->nobjects);
	cf_WriteInt(ifile,g->ndoors);
	cf_WriteInt(ifile,g->ntriggers);

	//Write rooms
	for (i=0;i<g->nrooms;i++)
		WriteRoom(ifile,&g->rooms[i]);

	//Write objects
	for (i=0;i<g->nobjects;i++)
		WriteGroupObject(ifile,&g->objects[i]);

	//Write triggers
	for (i=0;i<g->ntriggers;i++)
		WriteGroupTrigger(ifile,&g->triggers[i]);

	//Close the file
	cfclose(ifile);
}

//Reads an object for a group
void ReadGroupObject(CFILE *ifile,object *objp)
{
	objp->type = cf_ReadByte(ifile);
	objp->id = cf_ReadShort(ifile);
	objp->flags = cf_ReadInt(ifile);

	if (objp->type == OBJ_DOOR)
		objp->shields = cf_ReadShort(ifile);

	objp->roomnum = cf_ReadInt(ifile);
	cf_ReadVector(ifile,&objp->pos);
	cf_ReadMatrix(ifile,&objp->orient);

	objp->contains_type = cf_ReadByte(ifile);
	objp->contains_id = cf_ReadByte(ifile);
	objp->contains_count = cf_ReadByte(ifile);

	objp->lifeleft = cf_ReadFloat(ifile);
}

void ReadGroupTrigger(CFILE *ifile,trigger *tp)
{
	tp->roomnum = cf_ReadShort(ifile);
	tp->facenum = cf_ReadShort(ifile);
	tp->flags = cf_ReadShort(ifile);
	tp->activator = cf_ReadShort(ifile);
}

//Loads a group from disk
group *LoadGroup(char *filename)
{
	CFILE *ifile;
	char tag[4];
	int version,level_version;
	group *g;
	int i;

	ifile = cfopen(filename,"rb");

	if (!ifile)
		return NULL;

	//Read & check tag
	cf_ReadBytes((uint8_t *) tag,4,ifile);
	if (strncmp(tag,GROUP_FILE_TAG,4)) {
		cfclose(ifile);
		return NULL;
	}

	//Read & check version number
	version = cf_ReadInt(ifile);
	if (version > GROUP_FILE_VERSION) {
		cfclose(ifile);
		return NULL;
	}

	//Check for out-of-date groups
	if (version < 2) {
		OutrageMessageBox("Sorry - segment groups no longer supported.");
		cfclose(ifile);
		return NULL;
	}

	//Read & check level file version number
	level_version = cf_ReadInt(ifile);
	if (level_version > LEVEL_FILE_VERSION) {
		cfclose(ifile);
		return NULL;
	}

	//Read the textures & build xlate table
	ReadTextureList(ifile);

	//Allocate group
	g = (group *) mem_malloc(sizeof(*g));

	//Read group info
	g->nrooms = cf_ReadInt(ifile);
	g->attachroom = cf_ReadInt(ifile);
	g->attachface = cf_ReadInt(ifile);

	//Read object, door, & trigger info
	if (version >= 3) {
		g->nobjects = cf_ReadInt(ifile);
		g->ndoors = cf_ReadInt(ifile);
		g->ntriggers = cf_ReadInt(ifile);
	}
	else
		g->nobjects = g->ndoors = g->ntriggers = 0;

	//Allocate room and vertex arrays
	g->rooms = (room *) mem_malloc(sizeof(*g->rooms) * g->nrooms);

	//Read rooms
	for (i=0;i<g->nrooms;i++) {
		g->rooms[i].used = 0;		//ReadRoom() wants the used flag to be clear
		ReadRoom(ifile,&g->rooms[i],level_version);
	}

	//Read objects & triggers
	g->triggers = NULL;
	g->objects = NULL;
	if (version >= 3) {

		//Allocate objects array
		if (g->nobjects)
			g->objects = (object *) mem_malloc(sizeof(*g->objects) * g->nobjects);

		//Allocate triggers array
		if (g->ntriggers)
			g->triggers = (trigger *) mem_malloc(sizeof(*g->triggers) * g->ntriggers);

		//Read objects
		for (i=0;i<g->nobjects;i++)
			ReadGroupObject(ifile,&g->objects[i]);

		//Read triggers
		for (i=0;i<g->ntriggers;i++)
			ReadGroupTrigger(ifile,&g->triggers[i]);
	}

	//Close the file
	cfclose(ifile);

	return g;
}