//Anything above this #include will be ignored by the compiler
#include "../qcommon/exe_headers.h"

#include "cm_local.h"

#ifdef _XBOX
#include "../renderer/tr_local.h"
#endif

/*
==================
CM_PointLeafnum_r

==================
*/
int CM_PointLeafnum_r( const vec3_t p, int num, clipMap_t *local ) {
	float		d;
	cNode_t		*node;
	cplane_t	*plane;

	while (num >= 0)
	{
		node = local->nodes + num;

#ifdef _XBOX
		plane = cmg.planes + node->planeNum;//tr.world->nodes[num].planeNum;
#else
		plane = node->plane;
#endif
		
		if (plane->type < 3)
			d = p[plane->type] - plane->dist;
		else
			d = DotProduct (plane->normal, p) - plane->dist;
		if (d < 0)
			num = node->children[1];
		else
			num = node->children[0];
	}

	c_pointcontents++;		// optimize counter

	return -1 - num;
}

int CM_PointLeafnum( const vec3_t p ) {
	if ( !cmg.numNodes ) {	// map not loaded
		return 0;
	}
	return CM_PointLeafnum_r (p, 0, &cmg);
}


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

LEAF LISTING

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


void CM_StoreLeafs( leafList_t *ll, int nodenum ) {
	int		leafNum;

	leafNum = -1 - nodenum;

	// store the lastLeaf even if the list is overflowed
	if ( cmg.leafs[ leafNum ].cluster != -1 ) {
		ll->lastLeaf = leafNum;
	}

	if ( ll->count >= ll->maxcount) {
		ll->overflowed = qtrue;
		return;
	}
	ll->list[ ll->count++ ] = leafNum;
}

void CM_StoreBrushes( leafList_t *ll, int nodenum ) {
	int			i, k;
	int			leafnum;
	int			brushnum;
	cLeaf_t		*leaf;
	cbrush_t	*b;

	leafnum = -1 - nodenum;

	leaf = &cmg.leafs[leafnum];

	for ( k = 0 ; k < leaf->numLeafBrushes ; k++ ) {
		brushnum = cmg.leafbrushes[leaf->firstLeafBrush+k];
		b = &cmg.brushes[brushnum];
		if ( b->checkcount == cmg.checkcount ) {
			continue;	// already checked this brush in another leaf
		}
		b->checkcount = cmg.checkcount;
		for ( i = 0 ; i < 3 ; i++ ) {
			if ( b->bounds[0][i] >= ll->bounds[1][i] || b->bounds[1][i] <= ll->bounds[0][i] ) {
				break;
			}
		}
		if ( i != 3 ) {
			continue;
		}
		if ( ll->count >= ll->maxcount) {
			ll->overflowed = qtrue;
			return;
		}
		((cbrush_t **)ll->list)[ ll->count++ ] = b;
	}
#if 0
	// store patches?
	for ( k = 0 ; k < leaf->numLeafSurfaces ; k++ ) {
		patch = cm.surfaces[ cm.leafsurfaces[ leaf->firstleafsurface + k ] ];
		if ( !patch ) {
			continue;
		}
	}
#endif
}

/*
=============
CM_BoxLeafnums

Fills in a list of all the leafs touched
=============
*/
void CM_BoxLeafnums_r( leafList_t *ll, int nodenum ) {
	cplane_t	*plane;
	cNode_t		*node;
	int			s;

	while (1) {
		if (nodenum < 0) {
			ll->storeLeafs( ll, nodenum );
			return;
		}
	
		node = &cmg.nodes[nodenum];

#ifdef _XBOX
		plane = cmg.planes + node->planeNum;//tr.world->nodes[nodenum].planeNum;
#else
		plane = node->plane;
#endif

		s = BoxOnPlaneSide( ll->bounds[0], ll->bounds[1], plane );
		if (s == 1) {
			nodenum = node->children[0];
		} else if (s == 2) {
			nodenum = node->children[1];
		} else {
			// go down both
			CM_BoxLeafnums_r( ll, node->children[0] );
			nodenum = node->children[1];
		}

	}
}

/*
==================
CM_BoxLeafnums
==================
*/
int	CM_BoxLeafnums( const vec3_t mins, const vec3_t maxs, int *boxList, int listsize, int *lastLeaf) {
	//rwwRMG - changed to boxList to not conflict with list type
	leafList_t	ll;

	cmg.checkcount++;

	VectorCopy( mins, ll.bounds[0] );
	VectorCopy( maxs, ll.bounds[1] );
	ll.count = 0;
	ll.maxcount = listsize;
	ll.list = boxList;
	ll.storeLeafs = CM_StoreLeafs;
	ll.lastLeaf = 0;
	ll.overflowed = qfalse;

	CM_BoxLeafnums_r( &ll, 0 );

	*lastLeaf = ll.lastLeaf;
	return ll.count;
}

/*
==================
CM_BoxBrushes
==================
*/
int CM_BoxBrushes( const vec3_t mins, const vec3_t maxs, cbrush_t **boxList, int listsize ) {
	//rwwRMG - changed to boxList to not conflict with list type
	leafList_t	ll;

	cmg.checkcount++;

	VectorCopy( mins, ll.bounds[0] );
	VectorCopy( maxs, ll.bounds[1] );
	ll.count = 0;
	ll.maxcount = listsize;
	ll.list = (int *)boxList;
	ll.storeLeafs = CM_StoreBrushes;
	ll.lastLeaf = 0;
	ll.overflowed = qfalse;
	
	CM_BoxLeafnums_r( &ll, 0 );

	return ll.count;
}


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


/*
==================
CM_PointContents

==================
*/
int CM_PointContents( const vec3_t p, clipHandle_t model ) {
	int			leafnum;
	int			i, k;
	int			brushnum;
	cLeaf_t		*leaf;
	cbrush_t	*b;
	int			contents;
	float		d;
	cmodel_t	*clipm;
	clipMap_t	*local;

	if (!cmg.numNodes) {	// map not loaded
		return 0;
	}

	if ( model ) 
	{
		clipm = CM_ClipHandleToModel( model, &local );
		if (clipm->firstNode != -1)
		{
			leafnum = CM_PointLeafnum_r (p, 0, local);
			leaf = &local->leafs[leafnum];
		}
		else
		{
			leaf = &clipm->leaf;
		}
	} 
	else 
	{
		local = &cmg;
		leafnum = CM_PointLeafnum_r (p, 0, &cmg);
		leaf = &local->leafs[leafnum];
	}

	contents = 0;
	for (k=0 ; k<leaf->numLeafBrushes ; k++) {
		brushnum = local->leafbrushes[leaf->firstLeafBrush+k];
		b = &local->brushes[brushnum];

		// see if the point is in the brush
		for ( i = 0 ; i < b->numsides ; i++ ) {
#ifdef _XBOX
			d = DotProduct( p, cmg.planes[b->sides[i].planeNum.GetValue()].normal );
#else
			d = DotProduct( p, b->sides[i].plane->normal );
#endif
// FIXME test for Cash
//			if ( d >= b->sides[i].plane->dist ) {
#ifdef _XBOX
			if ( d > cmg.planes[b->sides[i].planeNum.GetValue()].dist ) {
#else
			if ( d > b->sides[i].plane->dist ) {
#endif
				break;
			}
		}

		if ( i == b->numsides ) 
		{
			contents |= b->contents;
			if(cmg.landScape && (contents & CONTENTS_TERRAIN))
			{
				if(p[2] < cmg.landScape->GetWaterHeight())
				{
					contents |= cmg.landScape->GetWaterContents();
				}
			}
		}
	}

	return contents;
}

/*
==================
CM_TransformedPointContents

Handles offseting and rotation of the end points for moving and
rotating entities
==================
*/
int	CM_TransformedPointContents( const vec3_t p, clipHandle_t model, const vec3_t origin, const vec3_t angles) {
	vec3_t		p_l;
	vec3_t		temp;
	vec3_t		forward, right, up;

	// subtract origin offset
	VectorSubtract (p, origin, p_l);

	// rotate start and end into the models frame of reference
	if ( model != BOX_MODEL_HANDLE && 
	(angles[0] || angles[1] || angles[2]) )
	{
		AngleVectors (angles, forward, right, up);

		VectorCopy (p_l, temp);
		p_l[0] = DotProduct (temp, forward);
		p_l[1] = -DotProduct (temp, right);
		p_l[2] = DotProduct (temp, up);
	}

	return CM_PointContents( p_l, model );
}



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

PVS

===============================================================================
*/
#ifdef _XBOX
extern trGlobals_t tr;
const byte	*CM_ClusterPVS (int cluster) {
	if (cluster < 0 || cluster >= cmg.numClusters || !cmg.vised ) {
		return NULL;
	}

	return cmg.visibility->Decompress(cluster * cmg.clusterBytes,
			cmg.numClusters);
}

#else

byte	*CM_ClusterPVS (int cluster) {
	if (cluster < 0 || cluster >= cmg.numClusters || !cmg.vised ) {
		return cmg.visibility;
	}

	return cmg.visibility + cluster * cmg.clusterBytes;
}

#endif // _XBOX



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

AREAPORTALS

===============================================================================
*/
#ifdef _XBOX
void CM_FloodArea_r( int areaNum, int floodnum) {
	int		i;
	cArea_t *area;
	int		*con;

	area = &cmg.areas[ areaNum ];

	if ( area->floodvalid == cmg.floodvalid ) {
		if (area->floodnum == floodnum)
			return;
		Com_Error (ERR_DROP, "FloodArea_r: reflooded");
	}

	area->floodnum = floodnum;
	area->floodvalid = cmg.floodvalid;
	con = cmg.areaPortals + areaNum * cmg.numAreas;
	for ( i=0 ; i < cmg.numAreas  ; i++ ) {
		if ( con[i] > 0 ) {
			CM_FloodArea_r( i, floodnum );
		}
	}
}
#else  // _XBOX

void CM_FloodArea_r( int areaNum, int floodnum, clipMap_t &cm ) {
	int		i;
	cArea_t *area;
	int		*con;

	area = &cm.areas[ areaNum ];

	if ( area->floodvalid == cm.floodvalid ) {
		if (area->floodnum == floodnum)
			return;
		Com_Error (ERR_DROP, "FloodArea_r: reflooded");
	}

	area->floodnum = floodnum;
	area->floodvalid = cm.floodvalid;
	con = cm.areaPortals + areaNum * cm.numAreas;
	for ( i=0 ; i < cm.numAreas  ; i++ ) {
		if ( con[i] > 0 ) {
			CM_FloodArea_r( i, floodnum, cm );
		}
	}
}

#endif // _XBOX

/*
====================
CM_FloodAreaConnections

====================
*/
#ifdef _XBOX
void	CM_FloodAreaConnections( void ) {
	int		i;
	cArea_t	*area;
	int		floodnum;

	// all current floods are now invalid
	cmg.floodvalid++;
	floodnum = 0;

	for (i = 0 ; i < cmg.numAreas ; i++) {
		area = &cmg.areas[i];
		if (area->floodvalid == cmg.floodvalid) {
			continue;		// already flooded into
		}
		floodnum++;
		CM_FloodArea_r (i, floodnum);
	}

}
#else // _XBOX

void	CM_FloodAreaConnections( clipMap_t &cm ) {
	int		i;
	cArea_t	*area;
	int		floodnum;

	// all current floods are now invalid
	cm.floodvalid++;
	floodnum = 0;

	for (i = 0 ; i < cm.numAreas ; i++) {
		area = &cm.areas[i];
		if (area->floodvalid == cm.floodvalid) {
			continue;		// already flooded into
		}
		floodnum++;
		CM_FloodArea_r (i, floodnum, cm);
	}

}

#endif // _XBOX

/*
====================
CM_AdjustAreaPortalState

====================
*/
void	CM_AdjustAreaPortalState( int area1, int area2, qboolean open ) {
	if ( area1 < 0 || area2 < 0 ) {
		return;
	}

	if ( area1 >= cmg.numAreas || area2 >= cmg.numAreas ) {
		Com_Error (ERR_DROP, "CM_ChangeAreaPortalState: bad area number");
	}

	if ( open ) {
		cmg.areaPortals[ area1 * cmg.numAreas + area2 ]++;
		cmg.areaPortals[ area2 * cmg.numAreas + area1 ]++;
	} else {
		cmg.areaPortals[ area1 * cmg.numAreas + area2 ]--;
		cmg.areaPortals[ area2 * cmg.numAreas + area1 ]--;
		if ( cmg.areaPortals[ area2 * cmg.numAreas + area1 ] < 0 ) {
			Com_Error (ERR_DROP, "CM_AdjustAreaPortalState: negative reference count");
		}
	}

#ifdef _XBOX
	CM_FloodAreaConnections ();
#else
	CM_FloodAreaConnections (cmg);
#endif
}

/*
====================
CM_AreasConnected

====================
*/
qboolean	CM_AreasConnected( int area1, int area2 ) {
#ifndef BSPC
	if ( cm_noAreas->integer ) {
		return qtrue;
	}
#endif

	if ( area1 < 0 || area2 < 0 ) {
		return qfalse;
	}

	if (area1 >= cmg.numAreas || area2 >= cmg.numAreas) {
		Com_Error (ERR_DROP, "area >= cmg.numAreas");
	}

	if (cmg.areas[area1].floodnum == cmg.areas[area2].floodnum) {
		return qtrue;
	}
	return qfalse;
}


/*
=================
CM_WriteAreaBits

Writes a bit vector of all the areas
that are in the same flood as the area parameter
Returns the number of bytes needed to hold all the bits.

The bits are OR'd in, so you can CM_WriteAreaBits from multiple
viewpoints and get the union of all visible areas.

This is used to cull non-visible entities from snapshots
=================
*/
int CM_WriteAreaBits (byte *buffer, int area)
{
	int		i;
	int		floodnum;
	int		bytes;

	bytes = (cmg.numAreas+7)>>3;

#ifndef BSPC
	if (cm_noAreas->integer || area == -1)
#else
	if ( area == -1)
#endif
	{	// for debugging, send everything
		Com_Memset (buffer, 255, bytes);
	}
	else
	{
		floodnum = cmg.areas[area].floodnum;
		for (i=0 ; i<cmg.numAreas ; i++)
		{
			if (cmg.areas[i].floodnum == floodnum || area == -1)
				buffer[i>>3] |= 1<<(i&7);
		}
	}

	return bytes;
}