/*
Copyright (C) 1996-1997 Id Software, Inc.

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 2
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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// world.c -- world query functions

#include "quakedef.h"

/*

entities never clip against themselves, or their owner

line of sight checks trace->inopen and trace->inwater, but bullets don't

*/

cvar_t sv_debugmove = {CVAR_NOTIFY, "sv_debugmove", "0"};
cvar_t sv_polygoncollisions = {CVAR_NOTIFY, "sv_polygoncollisions", "0"};
cvar_t sv_areagrid_mingridsize = {CVAR_NOTIFY, "sv_areagrid_mingridsize", "64"};

void SV_AreaStats_f(void);

void SV_World_Init(void)
{
	Cvar_RegisterVariable(&sv_debugmove);
	Cvar_RegisterVariable(&sv_polygoncollisions);
	Cvar_RegisterVariable(&sv_areagrid_mingridsize);
	Cmd_AddCommand("sv_areastats", SV_AreaStats_f);
	Collision_Init();
}

typedef struct
{
	// bounding box of entire move area
	vec3_t boxmins, boxmaxs;

	// size of the moving object
	vec3_t mins, maxs;

	// size when clipping against monsters
	vec3_t mins2, maxs2;

	// size when clipping against brush models
	vec3_t hullmins, hullmaxs;

	// start and end origin of move
	vec3_t start, end;

	// trace results
	trace_t trace;

	// type of move (like ignoring monsters, or similar)
	int type;

	// the edict that is moving (if any)
	edict_t *passedict;
}
moveclip_t;

//#define EDICT_FROM_AREA(l) ((edict_t *)((qbyte *)l - (int)&(((edict_t *)0)->area)))
#define EDICT_FROM_AREA(l) ((edict_t *)l->entity)

//============================================================================

// ClearLink is used for new headnodes
void ClearLink (link_t *l)
{
	l->entity = NULL;
	l->prev = l->next = l;
}

void RemoveLink (link_t *l)
{
	l->next->prev = l->prev;
	l->prev->next = l->next;
}

void InsertLinkBefore (link_t *l, link_t *before, void *ent)
{
	l->entity = ent;
	l->next = before;
	l->prev = before->prev;
	l->prev->next = l;
	l->next->prev = l;
}

void InsertLinkAfter (link_t *l, link_t *after)
{
	l->next = after->next;
	l->prev = after;
	l->prev->next = l;
	l->next->prev = l;
}


/*
===============================================================================

ENTITY AREA CHECKING

===============================================================================
*/

int sv_areagrid_stats_calls = 0;
int sv_areagrid_stats_nodechecks = 0;
int sv_areagrid_stats_entitychecks = 0;

void SV_AreaStats_f(void)
{
	Con_Printf("areagrid check stats: %d calls %d nodes (%f per call) %d entities (%f per call)\n", sv_areagrid_stats_calls, sv_areagrid_stats_nodechecks, (double) sv_areagrid_stats_nodechecks / (double) sv_areagrid_stats_calls, sv_areagrid_stats_entitychecks, (double) sv_areagrid_stats_entitychecks / (double) sv_areagrid_stats_calls);
	sv_areagrid_stats_calls = 0;
	sv_areagrid_stats_nodechecks = 0;
	sv_areagrid_stats_entitychecks = 0;
}

typedef struct areagrid_s
{
	link_t trigger_edicts;
	link_t solid_edicts;
}
areagrid_t;

#define AREA_GRID 512
#define AREA_GRIDNODES (AREA_GRID * AREA_GRID)

static areagrid_t sv_areagrid[AREA_GRIDNODES], sv_areagrid_outside;
static vec3_t sv_areagrid_bias, sv_areagrid_scale, sv_areagrid_mins, sv_areagrid_maxs, sv_areagrid_size;
static int sv_areagrid_marknumber = 1;

void SV_CreateAreaGrid (vec3_t mins, vec3_t maxs)
{
	int i;
	ClearLink (&sv_areagrid_outside.trigger_edicts);
	ClearLink (&sv_areagrid_outside.solid_edicts);
	// choose either the world box size, or a larger box to ensure the grid isn't too fine
	sv_areagrid_size[0] = max(maxs[0] - mins[0], AREA_GRID * sv_areagrid_mingridsize.value);
	sv_areagrid_size[1] = max(maxs[1] - mins[1], AREA_GRID * sv_areagrid_mingridsize.value);
	sv_areagrid_size[2] = max(maxs[2] - mins[2], AREA_GRID * sv_areagrid_mingridsize.value);
	// figure out the corners of such a box, centered at the center of the world box
	sv_areagrid_mins[0] = (mins[0] + maxs[0] - sv_areagrid_size[0]) * 0.5f;
	sv_areagrid_mins[1] = (mins[1] + maxs[1] - sv_areagrid_size[1]) * 0.5f;
	sv_areagrid_mins[2] = (mins[2] + maxs[2] - sv_areagrid_size[2]) * 0.5f;
	sv_areagrid_maxs[0] = (mins[0] + maxs[0] + sv_areagrid_size[0]) * 0.5f;
	sv_areagrid_maxs[1] = (mins[1] + maxs[1] + sv_areagrid_size[1]) * 0.5f;
	sv_areagrid_maxs[2] = (mins[2] + maxs[2] + sv_areagrid_size[2]) * 0.5f;
	// now calculate the actual useful info from that
	VectorNegate(sv_areagrid_mins, sv_areagrid_bias);
	sv_areagrid_scale[0] = AREA_GRID / sv_areagrid_size[0];
	sv_areagrid_scale[1] = AREA_GRID / sv_areagrid_size[1];
	sv_areagrid_scale[2] = AREA_GRID / sv_areagrid_size[2];
	for (i = 0;i < AREA_GRIDNODES;i++)
	{
		ClearLink (&sv_areagrid[i].trigger_edicts);
		ClearLink (&sv_areagrid[i].solid_edicts);
	}
	Con_DPrintf("sv_areagrid settings: divisions %ix%ix1 : box %f %f %f : %f %f %f size %f %f %f grid %f %f %f (mingrid %f)\n", AREA_GRID, AREA_GRID, sv_areagrid_mins[0], sv_areagrid_mins[1], sv_areagrid_mins[2], sv_areagrid_maxs[0], sv_areagrid_maxs[1], sv_areagrid_maxs[2], sv_areagrid_size[0], sv_areagrid_size[1], sv_areagrid_size[2], 1.0f / sv_areagrid_scale[0], 1.0f / sv_areagrid_scale[1], 1.0f / sv_areagrid_scale[2], sv_areagrid_mingridsize.value);
}

/*
===============
SV_ClearWorld

===============
*/
void SV_ClearWorld (void)
{
	Mod_CheckLoaded(sv.worldmodel);
	SV_CreateAreaGrid(sv.worldmodel->normalmins, sv.worldmodel->normalmaxs);
}


/*
===============
SV_UnlinkEdict

===============
*/
void SV_UnlinkEdict (edict_t *ent)
{
	int i;
	for (i = 0;i < ENTITYGRIDAREAS;i++)
	{
		if (ent->areagrid[i].prev)
		{
			RemoveLink (&ent->areagrid[i]);
			ent->areagrid[i].prev = ent->areagrid[i].next = NULL;
		}
	}
}


void SV_TouchAreaGrid(edict_t *ent)
{
	link_t *l, *next;
	edict_t *touch;
	areagrid_t *grid;
	int old_self, old_other, igrid[3], igridmins[3], igridmaxs[3];

	sv_areagrid_marknumber++;
	igridmins[0] = (int) ((ent->v->absmin[0] + sv_areagrid_bias[0]) * sv_areagrid_scale[0]);
	igridmins[1] = (int) ((ent->v->absmin[1] + sv_areagrid_bias[1]) * sv_areagrid_scale[1]);
	//igridmins[2] = (int) ((ent->v->absmin[2] + sv_areagrid_bias[2]) * sv_areagrid_scale[2]);
	igridmaxs[0] = (int) ((ent->v->absmax[0] + sv_areagrid_bias[0]) * sv_areagrid_scale[0]) + 1;
	igridmaxs[1] = (int) ((ent->v->absmax[1] + sv_areagrid_bias[1]) * sv_areagrid_scale[1]) + 1;
	//igridmaxs[2] = (int) ((ent->v->absmax[2] + sv_areagrid_bias[2]) * sv_areagrid_scale[2]) + 1;
	igridmins[0] = max(0, igridmins[0]);
	igridmins[1] = max(0, igridmins[1]);
	//igridmins[2] = max(0, igridmins[2]);
	igridmaxs[0] = min(AREA_GRID, igridmaxs[0]);
	igridmaxs[1] = min(AREA_GRID, igridmaxs[1]);
	//igridmaxs[2] = min(AREA_GRID, igridmaxs[2]);

	for (l = sv_areagrid_outside.trigger_edicts.next;l != &sv_areagrid_outside.trigger_edicts;l = next)
	{
		next = l->next;
		touch = EDICT_FROM_AREA(l);
		if (ent->v->absmin[0] > touch->v->absmax[0]
		 || ent->v->absmax[0] < touch->v->absmin[0]
		 || ent->v->absmin[1] > touch->v->absmax[1]
		 || ent->v->absmax[1] < touch->v->absmin[1]
		 || ent->v->absmin[2] > touch->v->absmax[2]
		 || ent->v->absmax[2] < touch->v->absmin[2])
			continue;
		if (touch == ent)
			continue;
		if (!touch->v->touch || touch->v->solid != SOLID_TRIGGER)
			continue;
		old_self = pr_global_struct->self;
		old_other = pr_global_struct->other;

		pr_global_struct->self = EDICT_TO_PROG(touch);
		pr_global_struct->other = EDICT_TO_PROG(ent);
		pr_global_struct->time = sv.time;
		PR_ExecuteProgram (touch->v->touch, "");

		pr_global_struct->self = old_self;
		pr_global_struct->other = old_other;
	}

	for (igrid[1] = igridmins[1];igrid[1] < igridmaxs[1];igrid[1]++)
	{
		grid = sv_areagrid + igrid[1] * AREA_GRID + igridmins[0];
		for (igrid[0] = igridmins[0];igrid[0] < igridmaxs[0];igrid[0]++, grid++)
		{
			for (l = grid->trigger_edicts.next;l != &grid->trigger_edicts;l = next)
			{
				next = l->next;
				touch = EDICT_FROM_AREA(l);
				if (touch->areagridmarknumber == sv_areagrid_marknumber)
					continue;
				touch->areagridmarknumber = sv_areagrid_marknumber;
				if (ent->v->absmin[0] > touch->v->absmax[0]
				 || ent->v->absmax[0] < touch->v->absmin[0]
				 || ent->v->absmin[1] > touch->v->absmax[1]
				 || ent->v->absmax[1] < touch->v->absmin[1]
				 || ent->v->absmin[2] > touch->v->absmax[2]
				 || ent->v->absmax[2] < touch->v->absmin[2])
					continue;
				if (touch == ent)
					continue;
				if (!touch->v->touch || touch->v->solid != SOLID_TRIGGER)
					continue;
				old_self = pr_global_struct->self;
				old_other = pr_global_struct->other;

				pr_global_struct->self = EDICT_TO_PROG(touch);
				pr_global_struct->other = EDICT_TO_PROG(ent);
				pr_global_struct->time = sv.time;
				PR_ExecuteProgram (touch->v->touch, "");

				pr_global_struct->self = old_self;
				pr_global_struct->other = old_other;
			}
		}
	}
}

void SV_LinkEdict_AreaGrid(edict_t *ent)
{
	areagrid_t *grid;
	int igrid[3], igridmins[3], igridmaxs[3], gridnum;

	igridmins[0] = (int) ((ent->v->absmin[0] + sv_areagrid_bias[0]) * sv_areagrid_scale[0]);
	igridmins[1] = (int) ((ent->v->absmin[1] + sv_areagrid_bias[1]) * sv_areagrid_scale[1]);
	//igridmins[2] = (int) ((ent->v->absmin[2] + sv_areagrid_bias[2]) * sv_areagrid_scale[2]);
	igridmaxs[0] = (int) ((ent->v->absmax[0] + sv_areagrid_bias[0]) * sv_areagrid_scale[0]) + 1;
	igridmaxs[1] = (int) ((ent->v->absmax[1] + sv_areagrid_bias[1]) * sv_areagrid_scale[1]) + 1;
	//igridmaxs[2] = (int) ((ent->v->absmax[2] + sv_areagrid_bias[2]) * sv_areagrid_scale[2]) + 1;
	if (igridmins[0] < 0 || igridmaxs[0] > AREA_GRID || igridmins[1] < 0 || igridmaxs[1] > AREA_GRID || ((igridmaxs[0] - igridmins[0]) * (igridmaxs[1] - igridmins[1])) > ENTITYGRIDAREAS)
	{
		// wow, something outside the grid, store it as such
		if (ent->v->solid == SOLID_TRIGGER)
			InsertLinkBefore (&ent->areagrid[0], &sv_areagrid_outside.trigger_edicts, ent);
		else
			InsertLinkBefore (&ent->areagrid[0], &sv_areagrid_outside.solid_edicts, ent);
		return;
	}

	gridnum = 0;
	for (igrid[1] = igridmins[1];igrid[1] < igridmaxs[1];igrid[1]++)
	{
		grid = sv_areagrid + igrid[1] * AREA_GRID + igridmins[0];
		for (igrid[0] = igridmins[0];igrid[0] < igridmaxs[0];igrid[0]++, grid++, gridnum++)
		{
			if (ent->v->solid == SOLID_TRIGGER)
				InsertLinkBefore (&ent->areagrid[gridnum], &grid->trigger_edicts, ent);
			else
				InsertLinkBefore (&ent->areagrid[gridnum], &grid->solid_edicts, ent);
		}
	}
}

/*
===============
SV_LinkEdict

===============
*/
void SV_LinkEdict (edict_t *ent, qboolean touch_triggers)
{
	model_t *model;

	if (ent->areagrid[0].prev)
		SV_UnlinkEdict (ent);	// unlink from old position

	if (ent == sv.edicts)
		return;		// don't add the world

	if (ent->free)
		return;

// set the abs box

	if (ent->v->solid == SOLID_BSP)
	{
		if (ent->v->modelindex < 0 || ent->v->modelindex > MAX_MODELS)
			Host_Error("SOLID_BSP with invalid modelindex!\n");
		model = sv.models[(int) ent->v->modelindex];
		if (model != NULL)
		{
			if (model->type != mod_brush)
				Host_Error("SOLID_BSP with non-BSP model\n");

			if (ent->v->angles[0] || ent->v->angles[2] || ent->v->avelocity[0] || ent->v->avelocity[2])
			{
				VectorAdd(ent->v->origin, model->rotatedmins, ent->v->absmin);
				VectorAdd(ent->v->origin, model->rotatedmaxs, ent->v->absmax);
			}
			else if (ent->v->angles[1] || ent->v->avelocity[1])
			{
				VectorAdd(ent->v->origin, model->yawmins, ent->v->absmin);
				VectorAdd(ent->v->origin, model->yawmaxs, ent->v->absmax);
			}
			else
			{
				VectorAdd(ent->v->origin, model->normalmins, ent->v->absmin);
				VectorAdd(ent->v->origin, model->normalmaxs, ent->v->absmax);
			}
		}
		else
		{
			// SOLID_BSP with no model is valid, mainly because some QC setup code does so temporarily
			VectorAdd(ent->v->origin, ent->v->mins, ent->v->absmin);
			VectorAdd(ent->v->origin, ent->v->maxs, ent->v->absmax);
		}
	}
	else
	{
		VectorAdd(ent->v->origin, ent->v->mins, ent->v->absmin);
		VectorAdd(ent->v->origin, ent->v->maxs, ent->v->absmax);
	}

//
// to make items easier to pick up and allow them to be grabbed off
// of shelves, the abs sizes are expanded
//
	if ((int)ent->v->flags & FL_ITEM)
	{
		ent->v->absmin[0] -= 15;
		ent->v->absmin[1] -= 15;
		ent->v->absmin[2] -= 1;
		ent->v->absmax[0] += 15;
		ent->v->absmax[1] += 15;
		ent->v->absmax[2] += 1;
	}
	else
	{
		// because movement is clipped an epsilon away from an actual edge,
		// we must fully check even when bounding boxes don't quite touch
		ent->v->absmin[0] -= 1;
		ent->v->absmin[1] -= 1;
		ent->v->absmin[2] -= 1;
		ent->v->absmax[0] += 1;
		ent->v->absmax[1] += 1;
		ent->v->absmax[2] += 1;
	}

	if (ent->v->solid == SOLID_NOT)
		return;

	SV_LinkEdict_AreaGrid(ent);

// if touch_triggers, touch all entities at this node and descend for more
	if (touch_triggers)
		SV_TouchAreaGrid(ent);
}



/*
===============================================================================

POINT TESTING IN HULLS

===============================================================================
*/

/*
============
SV_TestEntityPosition

This could be a lot more efficient...
============
*/
int SV_TestEntityPosition (edict_t *ent)
{
	return SV_Move (ent->v->origin, ent->v->mins, ent->v->maxs, ent->v->origin, MOVE_NORMAL, ent).startsolid;
}


/*
===============================================================================

LINE TESTING IN HULLS

===============================================================================
*/

/*
==================
SV_ClipMoveToEntity

Handles selection or creation of a clipping hull, and offseting (and
eventually rotation) of the end points
==================
*/
trace_t SV_ClipMoveToEntity (edict_t *ent, vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end)
{
	int i;
	trace_t trace;
	model_t *model;

	i = ent->v->modelindex;
	if ((unsigned int) i >= MAX_MODELS)
		Host_Error("SV_ClipMoveToEntity: invalid modelindex\n");
	model = sv.models[i];
	if (i != 0 && model == NULL)
		Host_Error("SV_ClipMoveToEntity: invalid modelindex\n");

	if ((int) ent->v->solid == SOLID_BSP)
	{
		Mod_CheckLoaded(model);
		if (model->type != mod_brush)
		{
			Con_Printf ("SV_ClipMoveToEntity: SOLID_BSP with a non bsp model, entity dump:\n");
			ED_Print (ent);
			Host_Error ("SV_ClipMoveToEntity: SOLID_BSP with a non bsp model\n");
		}
		if (ent->v->movetype != MOVETYPE_PUSH)
			Host_Error ("SV_ClipMoveToEntity: SOLID_BSP without MOVETYPE_PUSH");
	}

	if (sv_polygoncollisions.integer && (mins[0] != maxs[0] || mins[1] != maxs[1] || mins[2] != maxs[2]))
		Collision_PolygonClipTrace(&trace, ent, model, ent->v->origin, ent->v->angles, ent->v->mins, ent->v->maxs, start, mins, maxs, end);
	else
		Collision_ClipTrace(&trace, ent, model, ent->v->origin, ent->v->angles, ent->v->mins, ent->v->maxs, start, mins, maxs, end);

	return trace;
}

//===========================================================================

void SV_ClipToNode(moveclip_t *clip, link_t *list)
{
	link_t *l, *next;
	edict_t *touch;
	trace_t trace;

	sv_areagrid_stats_nodechecks++;
	for (l = list->next;l != list;l = next)
	{
		next = l->next;
		touch = EDICT_FROM_AREA(l);
		if (touch->areagridmarknumber == sv_areagrid_marknumber)
			continue;
		touch->areagridmarknumber = sv_areagrid_marknumber;
		sv_areagrid_stats_entitychecks++;

		if (clip->boxmins[0] > touch->v->absmax[0]
		 || clip->boxmaxs[0] < touch->v->absmin[0]
		 || clip->boxmins[1] > touch->v->absmax[1]
		 || clip->boxmaxs[1] < touch->v->absmin[1]
		 || clip->boxmins[2] > touch->v->absmax[2]
		 || clip->boxmaxs[2] < touch->v->absmin[2])
			continue;

		if (clip->type == MOVE_NOMONSTERS && touch->v->solid != SOLID_BSP)
			continue;

		if (touch->v->solid == SOLID_NOT)
			continue;

		if (clip->passedict)
		{
			if (clip->passedict->v->size[0] && !touch->v->size[0])
				continue;	// points never interact
			if (PROG_TO_EDICT(touch->v->owner) == clip->passedict)
				continue;	// don't clip against own missiles
			if (PROG_TO_EDICT(clip->passedict->v->owner) == touch)
				continue;	// don't clip against owner
			// LordHavoc: corpse code
			if (clip->passedict->v->solid == SOLID_CORPSE && (touch->v->solid == SOLID_SLIDEBOX || touch->v->solid == SOLID_CORPSE))
				continue;
			if (clip->passedict->v->solid == SOLID_SLIDEBOX && touch->v->solid == SOLID_CORPSE)
				continue;
		}

		if (touch == clip->passedict)
			continue;
		if (touch->v->solid == SOLID_TRIGGER)
		{
			ED_Print(touch);
			Host_Error ("Trigger in clipping list");
		}

		// might interact, so do an exact clip
		if (touch->v->solid == SOLID_BSP)
			trace = SV_ClipMoveToEntity (touch, clip->start, clip->hullmins, clip->hullmaxs, clip->end);
		else if ((int)touch->v->flags & FL_MONSTER)
			trace = SV_ClipMoveToEntity (touch, clip->start, clip->mins2, clip->maxs2, clip->end);
		else
			trace = SV_ClipMoveToEntity (touch, clip->start, clip->mins, clip->maxs, clip->end);
		// LordHavoc: take the 'best' answers from the new trace and combine with existing data
		if (trace.allsolid)
			clip->trace.allsolid = true;
		if (trace.startsolid)
		{
			clip->trace.startsolid = true;
			if (!clip->trace.ent)
				clip->trace.ent = trace.ent;
		}
		if (trace.inopen)
			clip->trace.inopen = true;
		if (trace.inwater)
			clip->trace.inwater = true;
		if (trace.fraction < clip->trace.fraction)
		{
			clip->trace.fraction = trace.fraction;
			VectorCopy(trace.endpos, clip->trace.endpos);
			clip->trace.plane = trace.plane;
			clip->trace.endcontents = trace.endcontents;
			clip->trace.ent = trace.ent;
		}
		if (clip->trace.allsolid)
			return;
	}
}

/*
====================
SV_ClipToAreaGrid

Mins and maxs enclose the entire area swept by the move
====================
*/
void SV_ClipToAreaGrid(moveclip_t *clip)
{
	areagrid_t *grid;
	int igrid[3], igridmins[3], igridmaxs[3];

	if (clip->trace.allsolid)
		return;

	sv_areagrid_stats_calls++;
	sv_areagrid_marknumber++;
	igridmins[0] = (int) ((clip->boxmins[0] + sv_areagrid_bias[0]) * sv_areagrid_scale[0]);
	igridmins[1] = (int) ((clip->boxmins[1] + sv_areagrid_bias[1]) * sv_areagrid_scale[1]);
	//igridmins[2] = (int) ((clip->boxmins[2] + sv_areagrid_bias[2]) * sv_areagrid_scale[2]);
	igridmaxs[0] = (int) ((clip->boxmaxs[0] + sv_areagrid_bias[0]) * sv_areagrid_scale[0]) + 1;
	igridmaxs[1] = (int) ((clip->boxmaxs[1] + sv_areagrid_bias[1]) * sv_areagrid_scale[1]) + 1;
	//igridmaxs[2] = (int) ((clip->boxmaxs[2] + sv_areagrid_bias[2]) * sv_areagrid_scale[2]) + 1;
	igridmins[0] = max(0, igridmins[0]);
	igridmins[1] = max(0, igridmins[1]);
	//igridmins[2] = max(0, igridmins[2]);
	igridmaxs[0] = min(AREA_GRID, igridmaxs[0]);
	igridmaxs[1] = min(AREA_GRID, igridmaxs[1]);
	//igridmaxs[2] = min(AREA_GRID, igridmaxs[2]);

	if (sv_areagrid_outside.solid_edicts.next != &sv_areagrid_outside.solid_edicts)
		SV_ClipToNode(clip, &sv_areagrid_outside.solid_edicts);

	for (igrid[1] = igridmins[1];igrid[1] < igridmaxs[1];igrid[1]++)
		for (grid = sv_areagrid + igrid[1] * AREA_GRID + igridmins[0], igrid[0] = igridmins[0];igrid[0] < igridmaxs[0];igrid[0]++, grid++)
			if (grid->solid_edicts.next != &grid->solid_edicts)
				SV_ClipToNode(clip, &grid->solid_edicts);
}


/*
==================
SV_MoveBounds
==================
*/
void SV_MoveBounds (vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end, vec3_t boxmins, vec3_t boxmaxs)
{
	if (!sv_debugmove.integer)
	{
		int i;

		for (i=0 ; i<3 ; i++)
		{
			if (end[i] > start[i])
			{
				boxmins[i] = start[i] + mins[i] - 1;
				boxmaxs[i] = end[i] + maxs[i] + 1;
			}
			else
			{
				boxmins[i] = end[i] + mins[i] - 1;
				boxmaxs[i] = start[i] + maxs[i] + 1;
			}
		}
	}
	else
	{
		// debug to test against everything
		boxmins[0] = boxmins[1] = boxmins[2] = -999999999;
		boxmaxs[0] = boxmaxs[1] = boxmaxs[2] =  999999999;
	}
}

/*
==================
SV_Move
==================
*/
trace_t SV_Move (vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end, int type, edict_t *passedict)
{
	moveclip_t	clip;
	vec3_t		bigmins, bigmaxs;
	int			i;

	memset ( &clip, 0, sizeof ( moveclip_t ) );

	VectorCopy(start, clip.start);
	VectorCopy(end, clip.end);
	VectorCopy(mins, clip.mins);
	VectorCopy(maxs, clip.maxs);
	clip.type = type;
	clip.passedict = passedict;

	Collision_RoundUpToHullSize(sv.worldmodel, clip.mins, clip.maxs, clip.hullmins, clip.hullmaxs);

	if (type == MOVE_MISSILE)
	{
		// LordHavoc: modified this, was = -15, now = clip.mins[i] - 15
		for (i=0 ; i<3 ; i++)
		{
			clip.mins2[i] = clip.mins[i] - 15;
			clip.maxs2[i] = clip.maxs[i] + 15;
		}
	}
	else
	{
		VectorCopy (clip.mins, clip.mins2);
		VectorCopy (clip.maxs, clip.maxs2);
	}

	bigmins[0] = min(clip.mins2[0], clip.hullmins[0]);
	bigmaxs[0] = max(clip.maxs2[0], clip.hullmaxs[0]);
	bigmins[1] = min(clip.mins2[1], clip.hullmins[1]);
	bigmaxs[1] = max(clip.maxs2[1], clip.hullmaxs[1]);
	bigmins[2] = min(clip.mins2[2], clip.hullmins[2]);
	bigmaxs[2] = max(clip.maxs2[2], clip.hullmaxs[2]);

	// clip to world
	clip.trace = SV_ClipMoveToEntity (sv.edicts, start, mins, maxs, end);

	// clip to entities
	// create the bounding box of the entire move
	SV_MoveBounds ( start, bigmins, bigmaxs, end, clip.boxmins, clip.boxmaxs );

	SV_ClipToAreaGrid(&clip);

	return clip.trace;
}