Xash3DArchive/xtools/bsplib/surface_meta.c

/* -------------------------------------------------------------------------------

Copyright (C) 1999-2007 id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant 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.

GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

----------------------------------------------------------------------------------

This code has been altered significantly from its original form, to support
several games based on the Quake III Arena engine, in the form of "Q3Map2."

------------------------------------------------------------------------------- */



/* marker */
#define SURFACE_META_C



/* dependencies */
#include "q3map2.h"



#define LIGHTMAP_EXCEEDED	-1
#define S_EXCEEDED			-2
#define T_EXCEEDED			-3
#define ST_EXCEEDED			-4
#define UNSUITABLE_TRIANGLE	-10
#define VERTS_EXCEEDED		-1000
#define INDEXES_EXCEEDED	-2000

#define GROW_META_VERTS		1024
#define GROW_META_TRIANGLES	1024

static int					numMetaSurfaces, numPatchMetaSurfaces;

static int					maxMetaVerts = 0;
static int					numMetaVerts = 0;
static int					firstSearchMetaVert = 0;
static bspDrawVert_t		*metaVerts = NULL;

static int					maxMetaTriangles = 0;
static int					numMetaTriangles = 0;
static metaTriangle_t		*metaTriangles = NULL;



/*
ClearMetaVertexes()
called before staring a new entity to clear out the triangle list
*/

void ClearMetaTriangles( void )
{
	numMetaVerts = 0;
	numMetaTriangles = 0;
}



/*
FindMetaVertex()
finds a matching metavertex in the global list, returning its index
*/

static int FindMetaVertex( bspDrawVert_t *src )
{
	int			i;
	bspDrawVert_t	*v, *temp;
	
	
	/* try to find an existing drawvert */
	for( i = firstSearchMetaVert, v = &metaVerts[ i ]; i < numMetaVerts; i++, v++ )
	{
		if( memcmp( src, v, sizeof( bspDrawVert_t ) ) == 0 )
			return i;
	}
	
	/* enough space? */
	if( numMetaVerts >= maxMetaVerts )
	{
		/* reallocate more room */
		maxMetaVerts += GROW_META_VERTS;
		temp = Malloc( maxMetaVerts * sizeof( bspDrawVert_t ) );
		if( metaVerts != NULL )
		{
			memcpy( temp, metaVerts, numMetaVerts * sizeof( bspDrawVert_t ) );
			Mem_Free( metaVerts );
		}
		metaVerts = temp;
	}
	
	/* add the triangle */
	memcpy( &metaVerts[ numMetaVerts ], src, sizeof( bspDrawVert_t ) );
	numMetaVerts++;
	
	/* return the count */
	return (numMetaVerts - 1);
}



/*
AddMetaTriangle()
adds a new meta triangle, allocating more memory if necessary
*/

static int AddMetaTriangle( void )
{
	metaTriangle_t	*temp;
	
	
	/* enough space? */
	if( numMetaTriangles >= maxMetaTriangles )
	{
		/* reallocate more room */
		maxMetaTriangles += GROW_META_TRIANGLES;
		temp = Malloc( maxMetaTriangles * sizeof( metaTriangle_t ) );
		if( metaTriangles != NULL )
		{
			memcpy( temp, metaTriangles, numMetaTriangles * sizeof( metaTriangle_t ) );
			Mem_Free( metaTriangles );
		}
		metaTriangles = temp;
	}
	
	/* increment and return */
	numMetaTriangles++;
	return numMetaTriangles - 1;
}



/*
FindMetaTriangle()
finds a matching metatriangle in the global list,
otherwise adds it and returns the index to the metatriangle
*/

int FindMetaTriangle( metaTriangle_t *src, bspDrawVert_t *a, bspDrawVert_t *b, bspDrawVert_t *c, int planeNum )
{
	int				triIndex;
	vec3_t			dir;

	
	
	/* detect degenerate triangles fixme: do something proper here */
	VectorSubtract( a->xyz, b->xyz, dir );
	if( VectorLength( dir ) < 0.125f )
		return -1;
	VectorSubtract( b->xyz, c->xyz, dir );
	if( VectorLength( dir ) < 0.125f )
		return -1;
	VectorSubtract( c->xyz, a->xyz, dir );
	if( VectorLength( dir ) < 0.125f )
		return -1;
	
	/* find plane */
	if( planeNum >= 0 )
	{
		/* because of precision issues with small triangles, try to use the specified plane */
		src->planeNum = planeNum;
		VectorCopy( mapplanes[ planeNum ].normal, src->plane );
		src->plane[ 3 ] = mapplanes[ planeNum ].dist;
	}
	else
	{
		/* calculate a plane from the triangle's points (and bail if a plane can't be constructed) */
		src->planeNum = -1;
		if( PlaneFromPoints( src->plane, a->xyz, b->xyz, c->xyz ) == false )
			return -1;
	}
	
	/* ydnar 2002-10-03: repair any bogus normals (busted ase import kludge) */
	if( VectorLength( a->normal ) <= 0.0f )
		VectorCopy( src->plane, a->normal );
	if( VectorLength( b->normal ) <= 0.0f )
		VectorCopy( src->plane, b->normal );
	if( VectorLength( c->normal ) <= 0.0f )
		VectorCopy( src->plane, c->normal );
	
	/* ydnar 2002-10-04: set lightmap axis if not already set */
	if( !(src->si->compileFlags & C_VERTEXLIT) &&
		src->lightmapAxis[ 0 ] == 0.0f && src->lightmapAxis[ 1 ] == 0.0f && src->lightmapAxis[ 2 ] == 0.0f )
	{
		/* the shader can specify an explicit lightmap axis */
		if( src->si->lightmapAxis[ 0 ] || src->si->lightmapAxis[ 1 ] || src->si->lightmapAxis[ 2 ] )
			VectorCopy( src->si->lightmapAxis, src->lightmapAxis );
		
		/* new axis-finding code */
		else
			CalcLightmapAxis( src->plane, src->lightmapAxis );
	}
	
	/* fill out the src triangle */
	src->indexes[ 0 ] = FindMetaVertex( a );
	src->indexes[ 1 ] = FindMetaVertex( b );
	src->indexes[ 2 ] = FindMetaVertex( c );
	
	/* try to find an existing triangle */
	#ifdef USE_EXHAUSTIVE_SEARCH
	{
		int				i;
		metaTriangle_t	*tri;
		
		
		for( i = 0, tri = metaTriangles; i < numMetaTriangles; i++, tri++ )
		{
			if( memcmp( src, tri, sizeof( metaTriangle_t ) ) == 0 )
				return i;
		}
	}
	#endif
	
	/* get a new triangle */
	triIndex = AddMetaTriangle();
	
	/* add the triangle */
	memcpy( &metaTriangles[ triIndex ], src, sizeof( metaTriangle_t ) );
	
	/* return the triangle index */
	return triIndex;
}



/*
SurfaceToMetaTriangles()
converts a classified surface to metatriangles
*/

static void SurfaceToMetaTriangles( mapDrawSurface_t *ds )
{
	int				i;
	metaTriangle_t	src;
	bspDrawVert_t	a, b, c;
	
	
	/* only handle certain types of surfaces */
	if( ds->type != SURFACE_FACE &&
		ds->type != SURFACE_META &&
		ds->type != SURFACE_FORCED_META &&
		ds->type != SURFACE_DECAL )
		return;
	
	/* speed at the expense of memory */
	firstSearchMetaVert = numMetaVerts;
	
	/* only handle valid surfaces */
	if( ds->type != SURFACE_BAD && ds->numVerts >= 3 && ds->numIndexes >= 3 )
	{
		/* walk the indexes and create triangles */
		for( i = 0; i < ds->numIndexes; i += 3 )
		{
			/* sanity check the indexes */
			if( ds->indexes[ i ] == ds->indexes[ i + 1 ] ||
				ds->indexes[ i ] == ds->indexes[ i + 2 ] ||
				ds->indexes[ i + 1 ] == ds->indexes[ i + 2 ] )
			{
				//%	Msg( "%d! ", ds->numVerts );
				continue;
			}
			
			/* build a metatriangle */
			src.si = ds->shaderInfo;
			src.side = (ds->sideRef != NULL ? ds->sideRef->side : NULL);
			src.entityNum = ds->entityNum;
			src.surfaceNum = ds->surfaceNum;
			src.planeNum = ds->planeNum;
			src.castShadows = ds->castShadows;
			src.recvShadows = ds->recvShadows;
			src.fogNum = ds->fogNum;
			src.sampleSize = ds->sampleSize;
			VectorCopy( ds->lightmapAxis, src.lightmapAxis );
			
			/* copy drawverts */
			memcpy( &a, &ds->verts[ ds->indexes[ i ] ], sizeof( a ) );
			memcpy( &b, &ds->verts[ ds->indexes[ i + 1 ] ], sizeof( b ) );
			memcpy( &c, &ds->verts[ ds->indexes[ i + 2 ] ], sizeof( c ) );
			FindMetaTriangle( &src, &a, &b, &c, ds->planeNum );
		}
		
		/* add to count */
		numMetaSurfaces++;
	}
	
	/* clear the surface (free verts and indexes, sets it to SURFACE_BAD) */
	ClearSurface( ds );
}



/*
TriangulatePatchSurface()
creates triangles from a patch
*/

void TriangulatePatchSurface( mapDrawSurface_t *ds )
{
	int					iterations, x, y, pw[ 5 ], r;
	mapDrawSurface_t	*dsNew;
	mesh_t				src, *subdivided, *mesh;
	
	
	/* try to early out */
	if( ds->numVerts == 0 || ds->type != SURFACE_PATCH || patchMeta == false )
		return;
	
	/* make a mesh from the drawsurf */ 
	src.width = ds->patchWidth;
	src.height = ds->patchHeight;
	src.verts = ds->verts;
	//%	subdivided = SubdivideMesh( src, 8, 999 );
	iterations = IterationsForCurve( ds->longestCurve, patch_subdivide->integer );
	subdivided = SubdivideMesh2( src, iterations );	//%	ds->maxIterations
	
	/* fit it to the curve and remove colinear verts on rows/columns */
	PutMeshOnCurve( *subdivided );
	mesh = RemoveLinearMeshColumnsRows( subdivided );
	FreeMesh( subdivided );
	//% MakeMeshNormals( mesh );
	
	/* make a copy of the drawsurface */
	dsNew = AllocDrawSurface( SURFACE_META );
	memcpy( dsNew, ds, sizeof( *ds ) );
	
	/* if the patch is nonsolid, then discard it */
	if( !(ds->shaderInfo->compileFlags & C_SOLID) )
		ClearSurface( ds );
	
	/* set new pointer */
	ds = dsNew;
	
	/* basic transmogrification */
	ds->type = SURFACE_META;
	ds->numIndexes = 0;
	ds->indexes = Malloc( mesh->width * mesh->height * 6 * sizeof( int ) );
	
	/* copy the verts in */
	ds->numVerts = (mesh->width * mesh->height);
	ds->verts = mesh->verts;
	
	/* iterate through the mesh quads */
	for( y = 0; y < (mesh->height - 1); y++ )
	{
		for( x = 0; x < (mesh->width - 1); x++ )
		{
			/* set indexes */
			pw[ 0 ] = x + (y * mesh->width);
			pw[ 1 ] = x + ((y + 1) * mesh->width);
			pw[ 2 ] = x + 1 + ((y + 1) * mesh->width);
			pw[ 3 ] = x + 1 + (y * mesh->width);
			pw[ 4 ] = x + (y * mesh->width);	/* same as pw[ 0 ] */
			
			/* set radix */
			r = (x + y) & 1;
			
			/* make first triangle */
			ds->indexes[ ds->numIndexes++ ] = pw[ r + 0 ];
			ds->indexes[ ds->numIndexes++ ] = pw[ r + 1 ];
			ds->indexes[ ds->numIndexes++ ] = pw[ r + 2 ];
			
			/* make second triangle */
			ds->indexes[ ds->numIndexes++ ] = pw[ r + 0 ];
			ds->indexes[ ds->numIndexes++ ] = pw[ r + 2 ];
			ds->indexes[ ds->numIndexes++ ] = pw[ r + 3 ];
		}
	}
	
	/* free the mesh, but not the verts */
	Mem_Free( mesh );
	
	/* add to count */
	numPatchMetaSurfaces++;
	
	/* classify it */
	ClassifySurfaces( 1, ds );
}



/*
FanFaceSurface() - ydnar
creates a tri-fan from a brush face winding
loosely based on SurfaceAsTriFan()
*/

void FanFaceSurface( mapDrawSurface_t *ds )
{
	int				i, j, k, a, b, c, color[ MAX_LIGHTMAPS ][ 4 ];
	bspDrawVert_t	*verts, *centroid, *dv;
	double			iv;
	
	
	/* try to early out */
	if( !ds->numVerts || (ds->type != SURFACE_FACE && ds->type != SURFACE_DECAL) )
		return;
	
	/* add a new vertex at the beginning of the surface */
	verts = Malloc( (ds->numVerts + 1) * sizeof( bspDrawVert_t ) );
	memset( verts, 0, sizeof( bspDrawVert_t ) );
	memcpy( &verts[ 1 ], ds->verts, ds->numVerts * sizeof( bspDrawVert_t ) );
	Mem_Free( ds->verts );
	ds->verts = verts;
	
	/* add up the drawverts to create a centroid */
	centroid = &verts[ 0 ];
	memset( color, 0,  4 * MAX_LIGHTMAPS * sizeof( int ) );
	for( i = 1, dv = &verts[ 1 ]; i < (ds->numVerts + 1); i++, dv++ )
	{
		VectorAdd( centroid->xyz, dv->xyz, centroid->xyz );
		VectorAdd( centroid->normal, dv->normal, centroid->normal );
		for( j = 0; j < 4; j++ )
		{
			for( k = 0; k < MAX_LIGHTMAPS; k++ )
				color[ k ][ j ] += dv->color[ k ][ j ];
			if( j < 2 )
			{
				centroid->st[ j ] += dv->st[ j ];
				for( k = 0; k < MAX_LIGHTMAPS; k++ )
					centroid->lightmap[ k ][ j ] += dv->lightmap[ k ][ j ];
			}
		}
	}
	
	/* average the centroid */
	iv = 1.0f / ds->numVerts;
	VectorScale( centroid->xyz, iv, centroid->xyz );
	if( VectorNormalizeLength( centroid->normal ) <= 0 )
		VectorCopy( verts[ 1 ].normal, centroid->normal );
	for( j = 0; j < 4; j++ )
	{
		for( k = 0; k < MAX_LIGHTMAPS; k++ )
		{
			color[ k ][ j ] /= ds->numVerts;
			centroid->color[ k ][ j ] = (color[ k ][ j ] < 255.0f ? color[ k ][ j ] : 255);
		}
		if( j < 2 )
		{
			centroid->st[ j ] *= iv;
			for( k = 0; k < MAX_LIGHTMAPS; k++ )
				centroid->lightmap[ k ][ j ] *= iv;
		}
	}
	
	/* add to vert count */
	ds->numVerts++;
	
	/* fill indexes in triangle fan order */
	ds->numIndexes = 0;
	ds->indexes = Malloc( ds->numVerts * 3 * sizeof( int ) );
	for( i = 1; i < ds->numVerts; i++ )
	{
		a = 0;
		b = i;
		c = (i + 1) % ds->numVerts;
		c = c ? c : 1;
		ds->indexes[ ds->numIndexes++ ] = a;
		ds->indexes[ ds->numIndexes++ ] = b;
		ds->indexes[ ds->numIndexes++ ] = c;
	}
	
	/* add to count */
	numFanSurfaces++;

	/* classify it */
	ClassifySurfaces( 1, ds );
}



/*
StripFaceSurface() - ydnar
attempts to create a valid tri-strip w/o degenerate triangles from a brush face winding
based on SurfaceAsTriStrip()
*/

#define MAX_INDEXES		1024

void StripFaceSurface( mapDrawSurface_t *ds ) 
{
	int			i, r, least, rotate, numIndexes, ni, a, b, c, indexes[ MAX_INDEXES ];
	vec_t		*v1, *v2;
	
	
	/* try to early out  */
	if( !ds->numVerts || (ds->type != SURFACE_FACE && ds->type != SURFACE_DECAL) )
		return;
	
	/* is this a simple triangle? */
	if( ds->numVerts == 3 )
	{
		numIndexes = 3;
		VectorSet( indexes, 0, 1, 2 );
	}
	else
	{
		/* ydnar: find smallest coordinate */
		least = 0;
		if( ds->shaderInfo != NULL && ds->shaderInfo->autosprite == false )
		{
			for( i = 0; i < ds->numVerts; i++ )
			{
				/* get points */
				v1 = ds->verts[ i ].xyz;
				v2 = ds->verts[ least ].xyz;
				
				/* compare */
				if( v1[ 0 ] < v2[ 0 ] ||
					(v1[ 0 ] == v2[ 0 ] && v1[ 1 ] < v2[ 1 ]) ||
					(v1[ 0 ] == v2[ 0 ] && v1[ 1 ] == v2[ 1 ] && v1[ 2 ] < v2[ 2 ]) )
					least = i;
			}
		}
		
		/* determine the triangle strip order */
		numIndexes = (ds->numVerts - 2) * 3;
		if( numIndexes > MAX_INDEXES )
			Sys_Error( "MAX_INDEXES exceeded for surface (%d > %d) (%d verts)", numIndexes, MAX_INDEXES, ds->numVerts );
		
		/* try all possible orderings of the points looking for a non-degenerate strip order */
		for( r = 0; r < ds->numVerts; r++ )
		{
			/* set rotation */
			rotate = (r + least) % ds->numVerts;
			
			/* walk the winding in both directions */
			for( ni = 0, i = 0; i < ds->numVerts - 2 - i; i++ )
			{
				/* make indexes */
				a = (ds->numVerts - 1 - i + rotate) % ds->numVerts;
				b = (i + rotate ) % ds->numVerts;
				c = (ds->numVerts - 2 - i + rotate) % ds->numVerts;
				
				/* test this triangle */
				if( ds->numVerts > 4 && IsTriangleDegenerate( ds->verts, a, b, c ) )
					break;
				indexes[ ni++ ] = a;
				indexes[ ni++ ] = b;
				indexes[ ni++ ] = c;
				
				/* handle end case */
				if( i + 1 != ds->numVerts - 1 - i )
				{
					/* make indexes */
					a = (ds->numVerts - 2 - i + rotate ) % ds->numVerts;
					b = (i + rotate ) % ds->numVerts;
					c = (i + 1 + rotate ) % ds->numVerts;
					
					/* test triangle */
					if( ds->numVerts > 4 && IsTriangleDegenerate( ds->verts, a, b, c ) )
						break;
					indexes[ ni++ ] = a;
					indexes[ ni++ ] = b;
					indexes[ ni++ ] = c;
				}
			}
			
			/* valid strip? */
			if( ni == numIndexes )
				break;
		}
		
		/* if any triangle in the strip is degenerate, render from a centered fan point instead */
		if( ni < numIndexes )
		{
			FanFaceSurface( ds );
			return;
		}
	}
	
	/* copy strip triangle indexes */
	ds->numIndexes = numIndexes;
	ds->indexes = Malloc( ds->numIndexes * sizeof( int ) );
	memcpy( ds->indexes, indexes, ds->numIndexes * sizeof( int ) );
	
	/* add to count */
	numStripSurfaces++;
	
	/* classify it */
	ClassifySurfaces( 1, ds );
}



/*
MakeEntityMetaTriangles()
builds meta triangles from brush faces (tristrips and fans)
*/

void MakeEntityMetaTriangles( entity_t *e )
{
	int		i, f, fOld;
	double		start;
	mapDrawSurface_t	*ds;
	
	
	/* note it */
	MsgDev( D_NOTE, "--- MakeEntityMetaTriangles ---\n" );
	
	/* init pacifier */
	fOld = -1;
	start = Sys_DoubleTime();
	
	/* walk the list of surfaces in the entity */
	for( i = e->firstDrawSurf; i < numMapDrawSurfs; i++ )
	{
		/* print pacifier */
		f = 10 * (i - e->firstDrawSurf) / (numMapDrawSurfs - e->firstDrawSurf);
		if( f != fOld )
		{
			fOld = f;
			MsgDev( D_NOTE, "%d...", f );
		}
		
		/* get surface */
		ds = &mapDrawSurfs[ i ];
		if( ds->numVerts <= 0 )
			continue;
		
		/* ignore autosprite surfaces */
		if( ds->shaderInfo->autosprite )
			continue;
		
		/* meta this surface? */
		if( meta == false && ds->shaderInfo->forceMeta == false )
			continue;
		
		/* switch on type */
		switch( ds->type )
		{
		case SURFACE_FACE:
		case SURFACE_DECAL:
			StripFaceSurface( ds );
			SurfaceToMetaTriangles( ds );
			break;
		case SURFACE_PATCH:
			TriangulatePatchSurface( ds );
			break;
		case SURFACE_TRIANGLES:
			break;
		case SURFACE_FORCED_META:
		case SURFACE_META:
			SurfaceToMetaTriangles( ds );
			break;
		default:	break;
		}
	}
	
	if( (numMapDrawSurfs - e->firstDrawSurf ))
		MsgDev( D_NOTE, " (%g) seconds elapsed\n", (Sys_DoubleTime() - start));
	
	/* emit some stats */
	MsgDev( D_NOTE, "%9d total meta surfaces\n", numMetaSurfaces );
	MsgDev( D_NOTE, "%9d stripped surfaces\n", numStripSurfaces );
	MsgDev( D_NOTE, "%9d fanned surfaces\n", numFanSurfaces );
	MsgDev( D_NOTE, "%9d patch meta surfaces\n", numPatchMetaSurfaces );
	MsgDev( D_NOTE, "%9d meta verts\n", numMetaVerts );
	MsgDev( D_NOTE, "%9d meta triangles\n", numMetaTriangles );
	
	// tidy things up
	TidyEntitySurfaces( e );
}



/*
PointTriangleIntersect()
assuming that all points lie in plane, determine if pt
is inside the triangle abc
code originally (c) 2001 softSurfer (www.softsurfer.com)
*/

#define MIN_OUTSIDE_EPSILON		-0.01f
#define MAX_OUTSIDE_EPSILON		1.01f

static bool PointTriangleIntersect( vec3_t pt, vec4_t plane, vec3_t a, vec3_t b, vec3_t c, vec3_t bary )
{
	vec3_t	u, v, w;
	float	uu, uv, vv, wu, wv, d;
	
	
	/* make vectors */
	VectorSubtract( b, a, u );
	VectorSubtract( c, a, v );
	VectorSubtract( pt, a, w );
	
	/* more setup */
	uu = DotProduct( u, u );
	uv = DotProduct( u, v );
	vv = DotProduct( v, v );
	wu = DotProduct( w, u );
	wv = DotProduct( w, v );
	d = uv * uv - uu * vv;
	
	/* calculate barycentric coordinates */
	bary[ 1 ] = (uv * wv - vv * wu) / d;
	if( bary[ 1 ] < MIN_OUTSIDE_EPSILON || bary[ 1 ] > MAX_OUTSIDE_EPSILON )
		return false;
	bary[ 2 ] = (uv * wv - uu * wv) / d;
	if( bary[ 2 ] < MIN_OUTSIDE_EPSILON || bary[ 2 ] > MAX_OUTSIDE_EPSILON )
		return false;
	bary[ 0 ] = 1.0f - (bary[ 1 ] + bary[ 2 ]);
	
	/* point is in triangle */
	return true;
}



/*
CreateEdge()
sets up an edge structure from a plane and 2 points that the edge ab falls lies in
*/

typedef struct edge_s
{
	vec3_t	origin, edge;
	vec_t	length, kingpinLength;
	int	kingpin;
	vec4_t	plane;
} edge_t;

void CreateEdge( vec4_t plane, vec3_t a, vec3_t b, edge_t *edge )
{
	/* copy edge origin */
	VectorCopy( a, edge->origin );
	
	/* create vector aligned with winding direction of edge */
	VectorSubtract( b, a, edge->edge );
	
	if( fabs( edge->edge[ 0 ] ) > fabs( edge->edge[ 1 ] ) && fabs( edge->edge[ 0 ] ) > fabs( edge->edge[ 2 ] ) )
		edge->kingpin = 0;
	else if( fabs( edge->edge[ 1 ] ) > fabs( edge->edge[ 0 ] ) && fabs( edge->edge[ 1 ] ) > fabs( edge->edge[ 2 ] ) )
		edge->kingpin = 1;
	else
		edge->kingpin = 2;
	edge->kingpinLength = edge->edge[ edge->kingpin ];
	
	VectorNormalize( edge->edge );
	edge->edge[ 3 ] = DotProduct( a, edge->edge );
	edge->length = DotProduct( b, edge->edge ) - edge->edge[ 3 ];
	
	/* create perpendicular plane that edge lies in */
	CrossProduct( plane, edge->edge, edge->plane );
	edge->plane[ 3 ] = DotProduct( a, edge->plane );
}



/*
FixMetaTJunctions()
fixes t-junctions on meta triangles
*/

#define TJ_PLANE_EPSILON	(1.0f / 8.0f)
#define TJ_EDGE_EPSILON	(1.0f / 8.0f)
#define TJ_POINT_EPSILON	(1.0f / 8.0f)

void FixMetaTJunctions( void )
{
	int		i, j, k, f, fOld, vertIndex, triIndex, numTJuncs;
	metaTriangle_t	*tri, *newTri;
	shaderInfo_t	*si;
	bspDrawVert_t	*a, *b, *c, junc;
	double		start;
	float		dist, amount;
	vec3_t		pt;
	vec4_t		plane;
	edge_t		edges[ 3 ];
	
	
	/* this code is crap; revisit later */
	return;
	
	/* note it */
	MsgDev( D_INFO, "--- FixMetaTJunctions ---\n" );
	
	/* init pacifier */
	fOld = -1;
	start = Sys_DoubleTime();
	
	/* walk triangle list */
	numTJuncs = 0;
	for( i = 0; i < numMetaTriangles; i++ )
	{
		/* get triangle */
		tri = &metaTriangles[ i ];
		
		/* print pacifier */
		f = 10 * i / numMetaTriangles;
		if( f != fOld )
		{
			fOld = f;
			MsgDev( D_INFO, "%d...", f );
		}
		
		/* attempt to early out */
		si = tri->si;
		if( (si->compileFlags & C_NODRAW) || si->autosprite || si->notjunc )
			continue;
		
		/* calculate planes */
		VectorCopy( tri->plane, plane );
		plane[ 3 ] = tri->plane[ 3 ];
		CreateEdge( plane, metaVerts[ tri->indexes[ 0 ] ].xyz, metaVerts[ tri->indexes[ 1 ] ].xyz, &edges[ 0 ] );
		CreateEdge( plane, metaVerts[ tri->indexes[ 1 ] ].xyz, metaVerts[ tri->indexes[ 2 ] ].xyz, &edges[ 1 ] );
		CreateEdge( plane, metaVerts[ tri->indexes[ 2 ] ].xyz, metaVerts[ tri->indexes[ 0 ] ].xyz, &edges[ 2 ] );
		
		/* walk meta vert list */
		for( j = 0; j < numMetaVerts; j++ )
		{
			/* get vert */
			VectorCopy( metaVerts[ j ].xyz, pt );

			/* debug code: darken verts */
			if( i == 0 )
				VectorSet( metaVerts[ j ].color[ 0 ], 8, 8, 8 );
			
			/* determine if point lies in the triangle's plane */
			dist = DotProduct( pt, plane ) - plane[ 3 ];
			if( fabs( dist ) > TJ_PLANE_EPSILON )
				continue;
			
			/* skip this point if it already exists in the triangle */
			for( k = 0; k < 3; k++ )
			{
				if( fabs( pt[ 0 ] - metaVerts[ tri->indexes[ k ] ].xyz[ 0 ] ) <= TJ_POINT_EPSILON &&
					fabs( pt[ 1 ] - metaVerts[ tri->indexes[ k ] ].xyz[ 1 ] ) <= TJ_POINT_EPSILON &&
					fabs( pt[ 2 ] - metaVerts[ tri->indexes[ k ] ].xyz[ 2 ] ) <= TJ_POINT_EPSILON )
					break;
			}
			if( k < 3 )
				continue;
			
			/* walk edges */
			for( k = 0; k < 3; k++ )
			{
				/* ignore bogus edges */
				if( fabs( edges[ k ].kingpinLength ) < TJ_EDGE_EPSILON )
					continue;
				
				/* determine if point lies on the edge */
				dist = DotProduct( pt, edges[ k ].plane ) - edges[ k ].plane[ 3 ];
				if( fabs( dist ) > TJ_EDGE_EPSILON )
					continue;
				
				/* determine how far along the edge the point lies */
				amount = (pt[ edges[ k ].kingpin ] - edges[ k ].origin[ edges[ k ].kingpin ]) / edges[ k ].kingpinLength;
				if( amount <= 0.0f || amount >= 1.0f )
					continue;
				
				#if 0
				dist = DotProduct( pt, edges[ k ].edge ) - edges[ k ].edge[ 3 ];
				if( dist <= -0.0f || dist >= edges[ k ].length )
					continue;
				amount = dist / edges[ k ].length;
				#endif
				
				/* debug code: brighten this point */
				//%	metaVerts[ j ].color[ 0 ][ 0 ] += 5;
				//%	metaVerts[ j ].color[ 0 ][ 1 ] += 4;
				VectorSet( metaVerts[ tri->indexes[ k ] ].color[ 0 ], 255, 204, 0 );
				VectorSet( metaVerts[ tri->indexes[ (k + 1) % 3 ] ].color[ 0 ], 255, 204, 0 );
				

				/* the edge opposite the zero-weighted vertex was hit, so use that as an amount */
				a = &metaVerts[ tri->indexes[ k % 3 ] ];
				b = &metaVerts[ tri->indexes[ (k + 1) % 3 ] ];
				c = &metaVerts[ tri->indexes[ (k + 2) % 3 ] ];
				
				/* make new vert */
				LerpDrawVertAmount( a, b, amount, &junc );
				VectorCopy( pt, junc.xyz );
				
				/* compare against existing verts */
				if( VectorCompare( junc.xyz, a->xyz ) || VectorCompare( junc.xyz, b->xyz ) || VectorCompare( junc.xyz, c->xyz ) )
					continue;
				
				/* see if we can just re-use the existing vert */
				if( !memcmp( &metaVerts[ j ], &junc, sizeof( junc ) ) )
					vertIndex = j;
				else
				{
					/* find new vertex (note: a and b are invalid pointers after this) */
					firstSearchMetaVert = numMetaVerts;
					vertIndex = FindMetaVertex( &junc );
					if( vertIndex < 0 )
						continue;
				}
						
				/* make new triangle */
				triIndex = AddMetaTriangle();
				if( triIndex < 0 )
					continue;
				
				/* get triangles */
				tri = &metaTriangles[ i ];
				newTri = &metaTriangles[ triIndex ];
				
				/* copy the triangle */
				memcpy( newTri, tri, sizeof( *tri ) );
				
				/* fix verts */
				tri->indexes[ (k + 1) % 3 ] = vertIndex;
				newTri->indexes[ k ] = vertIndex;
				
				/* recalculate edges */
				CreateEdge( plane, metaVerts[ tri->indexes[ 0 ] ].xyz, metaVerts[ tri->indexes[ 1 ] ].xyz, &edges[ 0 ] );
				CreateEdge( plane, metaVerts[ tri->indexes[ 1 ] ].xyz, metaVerts[ tri->indexes[ 2 ] ].xyz, &edges[ 1 ] );
				CreateEdge( plane, metaVerts[ tri->indexes[ 2 ] ].xyz, metaVerts[ tri->indexes[ 0 ] ].xyz, &edges[ 2 ] );
				
				/* debug code */
				metaVerts[ vertIndex ].color[ 0 ][ 0 ] = 255;
				metaVerts[ vertIndex ].color[ 0 ][ 1 ] = 204;
				metaVerts[ vertIndex ].color[ 0 ][ 2 ] = 0;
				
				/* add to counter and end processing of this vert */
				numTJuncs++;
				break;
			}
		}
	}
	
	/* print time */
	MsgDev( D_INFO, " (%g)\n", (Sys_DoubleTime() - start) );
	
	/* emit some stats */
	MsgDev( D_INFO, "%9d T-junctions added\n", numTJuncs );
}



/*
SmoothMetaTriangles()
averages coincident vertex normals in the meta triangles
*/

#define MAX_SAMPLES				256
#define THETA_EPSILON			0.000001
#define EQUAL_NORMAL_EPSILON	0.01

void SmoothMetaTriangles( void )
{
	int			i, j, k, f, fOld, cs, numVerts, numVotes, numSmoothed;
	float			shadeAngle, defaultShadeAngle, maxShadeAngle, dot, testAngle;
	metaTriangle_t		*tri;
	float			*shadeAngles;
	byte			*smoothed;
	vec3_t			average, diff;
	int			indexes[ MAX_SAMPLES ];
	vec3_t			votes[ MAX_SAMPLES ];
	double			start;
	
	/* allocate shade angle table */
	shadeAngles = Malloc( numMetaVerts * sizeof( float ) );
	
	/* allocate smoothed table */
	cs = (numMetaVerts / 8) + 1;
	smoothed = Malloc( cs );
	memset( smoothed, 0, cs );
	
	/* set default shade angle */
	defaultShadeAngle = DEG2RAD( npDegrees );
	maxShadeAngle = 0.0f;
	
	/* run through every surface and flag verts belonging to non-lightmapped surfaces
	   and set per-vertex smoothing angle */
	for( i = 0, tri = &metaTriangles[ i ]; i < numMetaTriangles; i++, tri++ )
	{
		/* get shader for shade angle */
		if( tri->si->shadeAngleDegrees > 0.0f )
			shadeAngle = DEG2RAD( tri->si->shadeAngleDegrees );
		else
			shadeAngle = defaultShadeAngle;
		if( shadeAngle > maxShadeAngle )
			maxShadeAngle = shadeAngle;
		
		/* flag its verts */
		for( j = 0; j < 3; j++ )
		{
			shadeAngles[ tri->indexes[ j ] ] = shadeAngle;
			if( shadeAngle <= 0 )
				smoothed[ tri->indexes[ j ] >> 3 ] |= (1 << (tri->indexes[ j ] & 7));
		}
	}
	
	/* bail if no surfaces have a shade angle */
	if( maxShadeAngle <= 0 )
	{
		if( shadeAngles ) Mem_Free( shadeAngles );
		if( smoothed ) Mem_Free( smoothed );
		return;
	}

	MsgDev( D_NOTE, "--- SmoothMetaTriangles ---\n" );
	
	// init pacifier
	fOld = -1;
	start = Sys_DoubleTime();
	
	/* go through the list of vertexes */
	numSmoothed = 0;
	for( i = 0; i < numMetaVerts; i++ )
	{
		/* print pacifier */
		f = 10 * i / numMetaVerts;
		if( f != fOld )
		{
			fOld = f;
			MsgDev( D_NOTE, "%d...", f );
		}
		
		/* already smoothed? */
		if( smoothed[ i >> 3 ] & (1 << (i & 7)) )
			continue;
		
		/* clear */
		VectorClear( average );
		numVerts = 0;
		numVotes = 0;
		
		/* build a table of coincident vertexes */
		for( j = i; j < numMetaVerts && numVerts < MAX_SAMPLES; j++ )
		{
			/* already smoothed? */
			if( smoothed[ j >> 3 ] & (1 << (j & 7)) )
				continue;
			
			/* test vertexes */
			if( VectorCompare( metaVerts[ i ].xyz, metaVerts[ j ].xyz ) == false )
				continue;
			
			/* use smallest shade angle */
			shadeAngle = (shadeAngles[ i ] < shadeAngles[ j ] ? shadeAngles[ i ] : shadeAngles[ j ]);
			
			/* check shade angle */
			dot = DotProduct( metaVerts[ i ].normal, metaVerts[ j ].normal );
			if( dot > 1.0 )
				dot = 1.0;
			else if( dot < -1.0 )
				dot = -1.0;
			testAngle = acos( dot ) + THETA_EPSILON;
			if( testAngle >= shadeAngle )
				continue;
			
			/* add to the list */
			indexes[ numVerts++ ] = j;
			
			/* flag vertex */
			smoothed[ j >> 3 ] |= (1 << (j & 7));
			
			/* see if this normal has already been voted */
			for( k = 0; k < numVotes; k++ )
			{
				VectorSubtract( metaVerts[ j ].normal, votes[ k ], diff );
				if( fabs( diff[ 0 ] ) < EQUAL_NORMAL_EPSILON &&
					fabs( diff[ 1 ] ) < EQUAL_NORMAL_EPSILON &&
					fabs( diff[ 2 ] ) < EQUAL_NORMAL_EPSILON )
					break;
			}
			
			/* add a new vote? */
			if( k == numVotes && numVotes < MAX_SAMPLES )
			{
				VectorAdd( average, metaVerts[ j ].normal, average );
				VectorCopy( metaVerts[ j ].normal, votes[ numVotes ] );
				numVotes++;
			}
		}
		
		/* don't average for less than 2 verts */
		if( numVerts < 2 )
			continue;
		
		/* average normal */
		if( VectorNormalizeLength( average ) > 0 )
		{
			/* smooth */
			for( j = 0; j < numVerts; j++ )
				VectorCopy( average, metaVerts[ indexes[ j ] ].normal );
			numSmoothed++;
		}
	}
	
	/* free the tables */
	Mem_Free( shadeAngles );
	Mem_Free( smoothed );
	
	/* print time */
	MsgDev( D_NOTE, " (%g) seconds elapsed\n", (Sys_DoubleTime() - start));

	/* emit some stats */
	MsgDev( D_NOTE, "%9d smoothed vertexes\n", numSmoothed );
}



/*
AddMetaVertToSurface()
adds a drawvert to a surface unless an existing vert matching already exists
returns the index of that vert (or < 0 on failure)
*/

int AddMetaVertToSurface( mapDrawSurface_t *ds, bspDrawVert_t *dv1, int *coincident )
{
	int				i;
	bspDrawVert_t	*dv2;
	
	
	/* go through the verts and find a suitable candidate */
	for( i = 0; i < ds->numVerts; i++ )
	{
		/* get test vert */
		dv2 = &ds->verts[ i ];
		
		/* compare xyz and normal */
		if( VectorCompare( dv1->xyz, dv2->xyz ) == false )
			continue;
		if( VectorCompare( dv1->normal, dv2->normal ) == false )
			continue;
		
		/* good enough at this point */
		(*coincident)++;
		
		/* compare texture coordinates and color */
		if( dv1->st[ 0 ] != dv2->st[ 0 ] || dv1->st[ 1 ] != dv2->st[ 1 ] )
			continue;
		if( dv1->color[ 0 ][ 3 ] != dv2->color[ 0 ][ 3 ] )
			continue;
		
		/* found a winner */
		numMergedVerts++;
		return i;
	}

	/* overflow check */
	if( ds->numVerts >= ((ds->shaderInfo->compileFlags & C_VERTEXLIT) ? maxSurfaceVerts : maxLMSurfaceVerts) )
		return VERTS_EXCEEDED;
	
	/* made it this far, add the vert and return */
	dv2 = &ds->verts[ ds->numVerts++ ];
	*dv2 = *dv1;
	return (ds->numVerts - 1);
}




/*
AddMetaTriangleToSurface()
attempts to add a metatriangle to a surface
returns the score of the triangle added
*/

#define AXIS_SCORE			100000
#define AXIS_MIN			100000
#define VERT_SCORE			10000
#define SURFACE_SCORE		1000
#define ST_SCORE			50
#define ST_SCORE2			(2 * (ST_SCORE))

#define ADEQUATE_SCORE		((AXIS_MIN) + 1 * (VERT_SCORE))
#define GOOD_SCORE			((AXIS_MIN) + 2 * (VERT_SCORE) + 4 * (ST_SCORE))
#define PERFECT_SCORE		((AXIS_MIN) + + 3 * (VERT_SCORE) + (SURFACE_SCORE) + 4 * (ST_SCORE))

static int AddMetaTriangleToSurface( mapDrawSurface_t *ds, metaTriangle_t *tri, bool testAdd )
{
	int					i, score, coincident, ai, bi, ci, oldTexRange[ 2 ];
	float				lmMax;
	vec3_t				mins, maxs;
	bool			inTexRange, es, et;
	mapDrawSurface_t	old;
	
	
	/* overflow check */
	if( ds->numIndexes >= maxSurfaceIndexes )
		return 0;
	
	/* test the triangle */
	if( ds->entityNum != tri->entityNum )	/* ydnar: added 2002-07-06 */
		return 0;
	if( ds->castShadows != tri->castShadows || ds->recvShadows != tri->recvShadows )
		return 0;
	if( ds->shaderInfo != tri->si || ds->fogNum != tri->fogNum || ds->sampleSize != tri->sampleSize )
		return 0;
	#if 0
		if( !(ds->shaderInfo->compileFlags & C_VERTEXLIT) &&
			//% VectorCompare( ds->lightmapAxis, tri->lightmapAxis ) == false )
			DotProduct( ds->lightmapAxis, tri->plane ) < 0.25f )
			return 0;
	#endif
	
	/* planar surfaces will only merge with triangles in the same plane */
	if( npDegrees == 0.0f && ds->shaderInfo->nonplanar == false && ds->planeNum >= 0 )
	{
		if( VectorCompare( mapplanes[ ds->planeNum ].normal, tri->plane ) == false || mapplanes[ ds->planeNum ].dist != tri->plane[ 3 ] )
			return 0;
		if( tri->planeNum >= 0 && tri->planeNum != ds->planeNum )
			return 0;
	}
	
	/* set initial score */
	score = tri->surfaceNum == ds->surfaceNum ? SURFACE_SCORE : 0;
	
	/* score the the dot product of lightmap axis to plane */
	if( (ds->shaderInfo->compileFlags & C_VERTEXLIT) || VectorCompare( ds->lightmapAxis, tri->lightmapAxis ) )
		score += AXIS_SCORE;
	else
		score += AXIS_SCORE * DotProduct( ds->lightmapAxis, tri->plane );
	
	/* preserve old drawsurface if this fails */
	memcpy( &old, ds, sizeof( *ds ) );
	
	/* attempt to add the verts */
	coincident = 0;
	ai = AddMetaVertToSurface( ds, &metaVerts[ tri->indexes[ 0 ] ], &coincident );
	bi = AddMetaVertToSurface( ds, &metaVerts[ tri->indexes[ 1 ] ], &coincident );
	ci = AddMetaVertToSurface( ds, &metaVerts[ tri->indexes[ 2 ] ], &coincident );
	
	/* check vertex underflow */
	if( ai < 0 || bi < 0 || ci < 0 )
	{
		memcpy( ds, &old, sizeof( *ds ) );
		return 0;
	}
	
	/* score coincident vertex count (2003-02-14: changed so this only matters on planar surfaces) */
	score += (coincident * VERT_SCORE);
	
	/* add new vertex bounds to mins/maxs */
	VectorCopy( ds->mins, mins );
	VectorCopy( ds->maxs, maxs );
	AddPointToBounds( metaVerts[ tri->indexes[ 0 ] ].xyz, mins, maxs );
	AddPointToBounds( metaVerts[ tri->indexes[ 1 ] ].xyz, mins, maxs );
	AddPointToBounds( metaVerts[ tri->indexes[ 2 ] ].xyz, mins, maxs );
	
	/* check lightmap bounds overflow (after at least 1 triangle has been added) */
	if( !(ds->shaderInfo->compileFlags & C_VERTEXLIT) &&
		ds->numIndexes > 0 && VectorLength( ds->lightmapAxis ) > 0.0f &&
		(VectorCompare( ds->mins, mins ) == false || VectorCompare( ds->maxs, maxs ) == false) )
	{
		/* set maximum size before lightmap scaling (normally 2032 units) */
		/* 2004-02-24: scale lightmap test size by 2 to catch larger brush faces */
		/* 2004-04-11: reverting to actual lightmap size */
		lmMax = (ds->sampleSize * (ds->shaderInfo->lmCustomWidth - 1));
		for( i = 0; i < 3; i++ )
		{
			if( (maxs[ i ] - mins[ i ]) > lmMax )
			{
				memcpy( ds, &old, sizeof( *ds ) );
				return 0;
			}
		}
	}
	
	/* check texture range overflow */
	oldTexRange[ 0 ] = ds->texRange[ 0 ];
	oldTexRange[ 1 ] = ds->texRange[ 1 ];
	inTexRange = CalcSurfaceTextureRange( ds );
	
	es = (ds->texRange[ 0 ] > oldTexRange[ 0 ]) ? true : false;
	et = (ds->texRange[ 1 ] > oldTexRange[ 1 ]) ? true : false;
	
	if( inTexRange == false && ds->numIndexes > 0 )
	{
		memcpy( ds, &old, sizeof( *ds ) );
		return UNSUITABLE_TRIANGLE;
	}
	
	/* score texture range */
	if( ds->texRange[ 0 ] <= oldTexRange[ 0 ] )
		score += ST_SCORE2;
	else if( ds->texRange[ 0 ] > oldTexRange[ 0 ] && oldTexRange[ 1 ] > oldTexRange[ 0 ] )
		score += ST_SCORE;
	
	if( ds->texRange[ 1 ] <= oldTexRange[ 1 ] )
		score += ST_SCORE2;
	else if( ds->texRange[ 1 ] > oldTexRange[ 1 ] && oldTexRange[ 0 ] > oldTexRange[ 1 ] )
		score += ST_SCORE;
	
	
	/* go through the indexes and try to find an existing triangle that matches abc */
	for( i = 0; i < ds->numIndexes; i += 3 )
	{
		/* 2002-03-11 (birthday!): rotate the triangle 3x to find an existing triangle */
		if( (ai == ds->indexes[ i ] && bi == ds->indexes[ i + 1 ] && ci == ds->indexes[ i + 2 ]) ||
			(bi == ds->indexes[ i ] && ci == ds->indexes[ i + 1 ] && ai == ds->indexes[ i + 2 ]) ||
			(ci == ds->indexes[ i ] && ai == ds->indexes[ i + 1 ] && bi == ds->indexes[ i + 2 ]) )
		{
			/* triangle already present */
			memcpy( ds, &old, sizeof( *ds ) );
			tri->si = NULL;
			return 0;
		}
		
		/* rotate the triangle 3x to find an inverse triangle (error case) */
		if( (ai == ds->indexes[ i ] && bi == ds->indexes[ i + 2 ] && ci == ds->indexes[ i + 1 ]) ||
			(bi == ds->indexes[ i ] && ci == ds->indexes[ i + 2 ] && ai == ds->indexes[ i + 1 ]) ||
			(ci == ds->indexes[ i ] && ai == ds->indexes[ i + 2 ] && bi == ds->indexes[ i + 1 ]) )
		{
			/* warn about it */
			MsgDev( D_WARN, "Flipped triangle: (%6.0f %6.0f %6.0f) (%6.0f %6.0f %6.0f) (%6.0f %6.0f %6.0f)\n",
				ds->verts[ ai ].xyz[ 0 ], ds->verts[ ai ].xyz[ 1 ], ds->verts[ ai ].xyz[ 2 ],
				ds->verts[ bi ].xyz[ 0 ], ds->verts[ bi ].xyz[ 1 ], ds->verts[ bi ].xyz[ 2 ],
				ds->verts[ ci ].xyz[ 0 ], ds->verts[ ci ].xyz[ 1 ], ds->verts[ ci ].xyz[ 2 ] );
			
			/* reverse triangle already present */
			memcpy( ds, &old, sizeof( *ds ) );
			tri->si = NULL;
			return 0;
		}
	}
	
	/* add the triangle indexes */
	if( ds->numIndexes < maxSurfaceIndexes )
		ds->indexes[ ds->numIndexes++ ] = ai;
	if( ds->numIndexes < maxSurfaceIndexes )
		ds->indexes[ ds->numIndexes++ ] = bi;
	if( ds->numIndexes < maxSurfaceIndexes )
		ds->indexes[ ds->numIndexes++ ] = ci;
	
	/* check index overflow */
	if( ds->numIndexes >= maxSurfaceIndexes  )
	{
		memcpy( ds, &old, sizeof( *ds ) );
		return 0;
	}
	
	/* sanity check the indexes */
	if( ds->numIndexes >= 3 &&
		(ds->indexes[ ds->numIndexes - 3 ] == ds->indexes[ ds->numIndexes - 2 ] ||
		ds->indexes[ ds->numIndexes - 3 ] == ds->indexes[ ds->numIndexes - 1 ] ||
		ds->indexes[ ds->numIndexes - 2 ] == ds->indexes[ ds->numIndexes - 1 ]) )
		Msg( "DEG:%d! ", ds->numVerts );
	
	/* testing only? */
	if( testAdd )
		memcpy( ds, &old, sizeof( *ds ) );
	else
	{
		/* copy bounds back to surface */
		VectorCopy( mins, ds->mins );
		VectorCopy( maxs, ds->maxs );
		
		/* mark triangle as used */
		tri->si = NULL;
	}
	
	/* add a side reference */
	ds->sideRef = AllocSideRef( tri->side, ds->sideRef );
	
	/* return to sender */
	return score;
}



/*
MetaTrianglesToSurface()
creates map drawsurface(s) from the list of possibles
*/

static void MetaTrianglesToSurface( int numPossibles, metaTriangle_t *possibles, int *fOld, int *numAdded )
{
	int					i, j, f, best, score, bestScore;
	metaTriangle_t		*seed, *test;
	mapDrawSurface_t	*ds;
	bspDrawVert_t		*verts;
	int					*indexes;
	bool			added;
	
	
	/* allocate arrays */
	verts = Malloc( sizeof( *verts ) * maxSurfaceVerts );
	indexes = Malloc( sizeof( *indexes ) * maxSurfaceIndexes );
	
	/* walk the list of triangles */
	for( i = 0, seed = possibles; i < numPossibles; i++, seed++ )
	{
		/* skip this triangle if it has already been merged */
		if( seed->si == NULL )
			continue;
		
		/* -----------------------------------------------------------------
		   initial drawsurf construction
		   ----------------------------------------------------------------- */
		
		/* start a new drawsurface */
		ds = AllocDrawSurface( SURFACE_META );
		ds->entityNum = seed->entityNum;
		ds->surfaceNum = seed->surfaceNum;
		ds->castShadows = seed->castShadows;
		ds->recvShadows = seed->recvShadows;
		
		ds->shaderInfo = seed->si;
		ds->planeNum = seed->planeNum;
		ds->fogNum = seed->fogNum;
		ds->sampleSize = seed->sampleSize;
		ds->verts = verts;
		ds->indexes = indexes;
		VectorCopy( seed->lightmapAxis, ds->lightmapAxis );
		ds->sideRef = AllocSideRef( seed->side, NULL );
		
		ClearBounds( ds->mins, ds->maxs );
		
		/* clear verts/indexes */
		memset( verts, 0, sizeof( verts ) );
		memset( indexes, 0, sizeof( indexes ) );
		
		/* add the first triangle */
		if( AddMetaTriangleToSurface( ds, seed, false ) )
			(*numAdded)++;
		
		/* -----------------------------------------------------------------
		   add triangles
		   ----------------------------------------------------------------- */
		
		/* progressively walk the list until no more triangles can be added */
		added = true;
		while( added )
		{
			/* print pacifier */
			f = 10 * *numAdded / numMetaTriangles;
			if( f > *fOld )
			{
				*fOld = f;
				MsgDev( D_INFO, "%d...", f );
			}
			
			/* reset best score */
			best = -1;
			bestScore = 0;
			added = false;
			
			/* walk the list of possible candidates for merging */
			for( j = i + 1, test = &possibles[ j ]; j < numPossibles; j++, test++ )
			{
				/* skip this triangle if it has already been merged */
				if( test->si == NULL )
					continue;
				
				/* score this triangle */
				score = AddMetaTriangleToSurface( ds, test, true );
				if( score > bestScore )
				{
					best = j;
					bestScore = score;
					
					/* if we have a score over a certain threshold, just use it */
					if( bestScore >= GOOD_SCORE )
					{
						if( AddMetaTriangleToSurface( ds, &possibles[ best ], false ) )
							(*numAdded)++;
						
						/* reset */
						best = -1;
						bestScore = 0;
						added = true;
					}
				}
			}
			
			/* add best candidate */
			if( best >= 0 && bestScore > ADEQUATE_SCORE )
			{
				if( AddMetaTriangleToSurface( ds, &possibles[ best ], false ) )
					(*numAdded)++;
				
				/* reset */
				added = true;
			}
		}
		
		/* copy the verts and indexes to the new surface */
		ds->verts = Malloc( ds->numVerts * sizeof( bspDrawVert_t ) );
		memcpy( ds->verts, verts, ds->numVerts * sizeof( bspDrawVert_t ) );
		ds->indexes = Malloc( ds->numIndexes * sizeof( int ) );
		memcpy( ds->indexes, indexes, ds->numIndexes * sizeof( int ) );
		
		/* classify the surface */
		ClassifySurfaces( 1, ds );
		
		/* add to count */
		numMergedSurfaces++;
	}
	
	/* free arrays */
	Mem_Free( verts );
	Mem_Free( indexes );
}



/*
CompareMetaTriangles()
compare function for qsort()
*/

static int CompareMetaTriangles( const void *a, const void *b )
{
	int		i, j, av, bv;
	vec3_t	aMins, bMins;
	
	
	/* shader first */
	if( ((metaTriangle_t*) a)->si < ((metaTriangle_t*) b)->si )
		return 1;
	else if( ((metaTriangle_t*) a)->si > ((metaTriangle_t*) b)->si )
		return -1;
	
	/* then fog */
	else if( ((metaTriangle_t*) a)->fogNum < ((metaTriangle_t*) b)->fogNum )
		return 1;
	else if( ((metaTriangle_t*) a)->fogNum > ((metaTriangle_t*) b)->fogNum )
		return -1;
	
	/* then plane */
	#if 0
		else if( npDegrees == 0.0f && ((metaTriangle_t*) a)->si->nonplanar == false &&
			((metaTriangle_t*) a)->planeNum >= 0 && ((metaTriangle_t*) a)->planeNum >= 0 )
		{
			if( ((metaTriangle_t*) a)->plane[ 3 ] < ((metaTriangle_t*) b)->plane[ 3 ] )
				return 1;
			else if( ((metaTriangle_t*) a)->plane[ 3 ] > ((metaTriangle_t*) b)->plane[ 3 ] )
				return -1;
			else if( ((metaTriangle_t*) a)->plane[ 0 ] < ((metaTriangle_t*) b)->plane[ 0 ] )
				return 1;
			else if( ((metaTriangle_t*) a)->plane[ 0 ] > ((metaTriangle_t*) b)->plane[ 0 ] )
				return -1;
			else if( ((metaTriangle_t*) a)->plane[ 1 ] < ((metaTriangle_t*) b)->plane[ 1 ] )
				return 1;
			else if( ((metaTriangle_t*) a)->plane[ 1 ] > ((metaTriangle_t*) b)->plane[ 1 ] )
				return -1;
			else if( ((metaTriangle_t*) a)->plane[ 2 ] < ((metaTriangle_t*) b)->plane[ 2 ] )
				return 1;
			else if( ((metaTriangle_t*) a)->plane[ 2 ] > ((metaTriangle_t*) b)->plane[ 2 ] )
				return -1;
		}
	#endif
	
	/* then position in world */
	
	/* find mins */
	VectorSet( aMins, 999999, 999999, 999999 );
	VectorSet( bMins, 999999, 999999, 999999 );
	for( i = 0; i < 3; i++ )
	{
		av = ((metaTriangle_t*) a)->indexes[ i ];
		bv = ((metaTriangle_t*) b)->indexes[ i ];
		for( j = 0; j < 3; j++ )
		{
			if( metaVerts[ av ].xyz[ j ] < aMins[ j ] )
				aMins[ j ] = metaVerts[ av ].xyz[ j ];
			if( metaVerts[ bv ].xyz[ j ] < bMins[ j ] )
				bMins[ j ] = metaVerts[ bv ].xyz[ j ];
		}
	}
	
	/* test it */
	for( i = 0; i < 3; i++ )
	{
		if( aMins[ i ] < bMins[ i ] )
			return 1;
		else if( aMins[ i ] > bMins[ i ] )
			return -1;
	}
	
	/* functionally equivalent */
	return 0;
}



/*
MergeMetaTriangles()
merges meta triangles into drawsurfaces
*/

void MergeMetaTriangles( void )
{
	int			i, j, fOld, numAdded;
	metaTriangle_t		*head, *end;
	double			start;
	
	
	/* only do this if there are meta triangles */
	if( numMetaTriangles <= 0 )
		return;
	
	/* note it */
	MsgDev( D_INFO, "--- MergeMetaTriangles ---\n" );
	
	/* sort the triangles by shader major, fognum minor */
	qsort( metaTriangles, numMetaTriangles, sizeof( metaTriangle_t ), CompareMetaTriangles );

	/* init pacifier */
	fOld = -1;
	start = Sys_DoubleTime();
	numAdded = 0;
	
	/* merge */
	for( i = 0, j = 0; i < numMetaTriangles; i = j )
	{
		/* get head of list */
		head = &metaTriangles[ i ];
		
		/* skip this triangle if it has already been merged */
		if( head->si == NULL )
			continue;
		
		/* find end */
		if( j <= i )
		{
			for( j = i + 1; j < numMetaTriangles; j++ )
			{
				/* get end of list */
				end = &metaTriangles[ j ];
				if( head->si != end->si || head->fogNum != end->fogNum )
					break;
			}
		}
		
		/* try to merge this list of possible merge candidates */
		MetaTrianglesToSurface( (j - i), head, &fOld, &numAdded );
	}
	
	/* clear meta triangle list */
	ClearMetaTriangles();
	
	/* print time */
	if( i )
		MsgDev( D_INFO, " (%g)\n", (Sys_DoubleTime() - start) );
	
	/* emit some stats */
	MsgDev( D_INFO, "%9d surfaces merged\n", numMergedSurfaces );
	MsgDev( D_INFO, "%9d vertexes merged\n", numMergedVerts );
}