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

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_C



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



/*
AllocDrawSurface()
ydnar: gs mods: changed to force an explicit type when allocating
*/

mapDrawSurface_t *AllocDrawSurface( surfaceType_t type )
{
	mapDrawSurface_t	*ds;
	
	
	/* ydnar: gs mods: only allocate valid types */
	if( type <= SURFACE_BAD || type >= NUM_SURFACE_TYPES )
		Error( "AllocDrawSurface: Invalid surface type %d specified", type );
	
	/* bounds check */
	if( numMapDrawSurfs >= MAX_MAP_DRAW_SURFS )
		Error( "MAX_MAP_DRAW_SURFS (%d) exceeded", MAX_MAP_DRAW_SURFS );
	ds = &mapDrawSurfs[ numMapDrawSurfs ];
	numMapDrawSurfs++;
	
	/* ydnar: do initial surface setup */
	memset( ds, 0, sizeof( mapDrawSurface_t ) );
	ds->type = type;
	ds->planeNum = -1;
	ds->fogNum = defaultFogNum;				/* ydnar 2003-02-12 */
	ds->outputNum = -1;						/* ydnar 2002-08-13 */
	ds->surfaceNum = numMapDrawSurfs - 1;	/* ydnar 2003-02-16 */
	
	return ds;
}



/*
FinishSurface()
ydnar: general surface finish pass
*/

void FinishSurface( mapDrawSurface_t *ds )
{
	mapDrawSurface_t	*ds2;
	
	
	/* dummy check */
	if( ds->type <= SURFACE_BAD || ds->type >= NUM_SURFACE_TYPES || ds == NULL || ds->shaderInfo == NULL )
		return;
	
	/* ydnar: rocking tek-fu celshading */
	if( ds->celShader != NULL )
		MakeCelSurface( ds, ds->celShader );
	
	/* backsides stop here */
	if( ds->backSide )
		return;
	
	/* ydnar: rocking surface cloning (fur baby yeah!) */
	if( ds->shaderInfo->cloneShader != NULL && ds->shaderInfo->cloneShader[ 0 ] != '\0' )
		CloneSurface( ds, ShaderInfoForShader( ds->shaderInfo->cloneShader ) );
	
	/* ydnar: q3map_backShader support */
	if( ds->shaderInfo->backShader != NULL && ds->shaderInfo->backShader[ 0 ] != '\0' )
	{
		ds2 = CloneSurface( ds, ShaderInfoForShader( ds->shaderInfo->backShader ) );
		ds2->backSide = qtrue;
	}
}



/*
CloneSurface()
clones a map drawsurface, using the specified shader
*/

mapDrawSurface_t *CloneSurface( mapDrawSurface_t *src, shaderInfo_t *si )
{
	mapDrawSurface_t	*ds;
	
	
	/* dummy check */
	if( src == NULL || si == NULL )
		return NULL;
	
	/* allocate a new surface */
	ds = AllocDrawSurface( src->type );
	if( ds == NULL )
		return NULL;
	
	/* copy it */
	memcpy( ds, src, sizeof( *ds ) );
	
	/* destroy side reference */
	ds->sideRef = NULL;
	
	/* set shader */
	ds->shaderInfo = si;
	
	/* copy verts */
	if( ds->numVerts > 0 )
	{
		ds->verts = safe_malloc( ds->numVerts * sizeof( *ds->verts ) );
		memcpy( ds->verts, src->verts, ds->numVerts * sizeof( *ds->verts ) );
	}
	
	/* copy indexes */
	if( ds->numIndexes <= 0 )
		return ds;
	ds->indexes = safe_malloc( ds->numIndexes * sizeof( *ds->indexes ) );
	memcpy( ds->indexes, src->indexes, ds->numIndexes * sizeof( *ds->indexes ) );
	
	/* return the surface */
	return ds;
}



/*
MakeCelSurface() - ydnar
makes a copy of a surface, but specific to cel shading
*/

mapDrawSurface_t *MakeCelSurface( mapDrawSurface_t *src, shaderInfo_t *si )
{
	mapDrawSurface_t	*ds;
	
	
	/* dummy check */
	if( src == NULL || si == NULL )
		return NULL;
	
	/* don't create cel surfaces for certain types of shaders */
	if( (src->shaderInfo->compileFlags & C_TRANSLUCENT) ||
		(src->shaderInfo->compileFlags & C_SKY) )
		return NULL;
	
	/* make a copy */
	ds = CloneSurface( src, si );
	if( ds == NULL )
		return NULL;
	
	/* do some fixups for celshading */
	ds->planar = qfalse;
	ds->planeNum = -1;
	
	/* return the surface */
	return ds;
}



/*
MakeSkyboxSurface() - ydnar
generates a skybox surface, viewable from everywhere there is sky
*/

mapDrawSurface_t *MakeSkyboxSurface( mapDrawSurface_t *src )
{
	int					i;
	mapDrawSurface_t	*ds;
	
	
	/* dummy check */
	if( src == NULL )
		return NULL;
	
	/* make a copy */
	ds = CloneSurface( src, src->shaderInfo );
	if( ds == NULL )
		return NULL;
	
	/* set parent */
	ds->parent = src;
	
	/* scale the surface vertexes */
	for( i = 0; i < ds->numVerts; i++ )
	{
		m4x4_transform_point( skyboxTransform, ds->verts[ i ].xyz );
		
		/* debug code */
		//%	bspDrawVerts[ bspDrawSurfaces[ ds->outputNum ].firstVert + i ].color[ 0 ][ 1 ] = 0;
		//%	bspDrawVerts[ bspDrawSurfaces[ ds->outputNum ].firstVert + i ].color[ 0 ][ 2 ] = 0;
	}
	
	/* so backface culling creep doesn't bork the surface */
	VectorClear( ds->lightmapVecs[ 2 ] );
	
	/* return the surface */
	return ds;
}



/*
IsTriangleDegenerate
returns qtrue if all three points are colinear, backwards, or the triangle is just plain bogus
*/

#define	TINY_AREA	1.0f

qboolean IsTriangleDegenerate( bspDrawVert_t *points, int a, int b, int c )
{
	vec3_t		v1, v2, v3;
	float		d;
	
	
	/* calcuate the area of the triangle */
	VectorSubtract( points[ b ].xyz, points[ a ].xyz, v1 );
	VectorSubtract( points[ c ].xyz, points[ a ].xyz, v2 );
	CrossProduct( v1, v2, v3 );
	d = VectorLength( v3 );
	
	/* assume all very small or backwards triangles will cause problems */
	if( d < TINY_AREA )
		return qtrue;
	
	/* must be a good triangle */
	return qfalse;
}



/*
ClearSurface() - ydnar
clears a surface and frees any allocated memory
*/

void ClearSurface( mapDrawSurface_t *ds )
{
	ds->type = SURFACE_BAD;
	ds->planar = qfalse;
	ds->planeNum = -1;
	ds->numVerts = 0;
	if( ds->verts != NULL )
		free( ds->verts );
	ds->verts = NULL;
	ds->numIndexes = 0;
	if( ds->indexes != NULL )
		free( ds->indexes );
	ds->indexes = NULL;
	numClearedSurfaces++;
}



/*
TidyEntitySurfaces() - ydnar
deletes all empty or bad surfaces from the surface list
*/

void TidyEntitySurfaces( entity_t *e )
{
	int					i, j, deleted;
	mapDrawSurface_t	*out, *in;
	
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- TidyEntitySurfaces ---\n" );
	
	/* walk the surface list */
	deleted = 0;
	for( i = e->firstDrawSurf, j = e->firstDrawSurf; j < numMapDrawSurfs; i++, j++ )
	{
		/* get out surface */
		out = &mapDrawSurfs[ i ];
		
		/* walk the surface list again until a proper surface is found */
		for( ; j < numMapDrawSurfs; j++ )
		{
			/* get in surface */
			in = &mapDrawSurfs[ j ];
			
			/* this surface ok? */
			if( in->type == SURFACE_FLARE || in->type == SURFACE_SHADER ||
				(in->type != SURFACE_BAD && in->numVerts > 0) )
				break;
			
			/* nuke it */
			ClearSurface( in );
			deleted++;
		}
		
		/* copy if necessary */
		if( i != j )
			memcpy( out, in, sizeof( mapDrawSurface_t ) );
	}
	
	/* set the new number of drawsurfs */
	numMapDrawSurfs = i;
	
	/* emit some stats */
	Sys_FPrintf( SYS_VRB, "%9d empty or malformed surfaces deleted\n", deleted );
}



/*
CalcSurfaceTextureRange() - ydnar
calculates the clamped texture range for a given surface, returns qtrue if it's within [-texRange,texRange]
*/

qboolean CalcSurfaceTextureRange( mapDrawSurface_t *ds )
{
	int		i, j, v, size[ 2 ];
	float	mins[ 2 ], maxs[ 2 ];
	
	
	/* try to early out */
	if( ds->numVerts <= 0 )
		return qtrue;
	
	/* walk the verts and determine min/max st values */
	mins[ 0 ] = 999999;
	mins[ 1 ] = 999999;
	maxs[ 0 ] = -999999;
	maxs[ 1 ] = -999999;
	for( i = 0; i < ds->numVerts; i++ )
	{
		for( j = 0; j < 2; j++ )
		{
			if( ds->verts[ i ].st[ j ] < mins[ j ] )
				mins[ j ] = ds->verts[ i ].st[ j ];
			if( ds->verts[ i ].st[ j ] > maxs[ j ] )
				maxs[ j ] = ds->verts[ i ].st[ j ];
		}
	}
	
	/* clamp to integer range and calculate surface bias values */
	for( j = 0; j < 2; j++ )
		ds->bias[ j ] = -floor( 0.5f * (mins[ j ] + maxs[ j ]) );
	
	/* find biased texture coordinate mins/maxs */
	size[ 0 ] = ds->shaderInfo->shaderWidth;
	size[ 1 ] = ds->shaderInfo->shaderHeight;
	ds->texMins[ 0 ] = 999999;
	ds->texMins[ 1 ] = 999999;
	ds->texMaxs[ 0 ] = -999999;
	ds->texMaxs[ 1 ] = -999999;
	for( i = 0; i < ds->numVerts; i++ )
	{
		for( j = 0; j < 2; j++ )
		{
			v = ((float) ds->verts[ i ].st[ j ] + ds->bias[ j ]) * size[ j ];
			if( v < ds->texMins[ j ] )
				ds->texMins[ j ] = v;
			if( v > ds->texMaxs[ j ] )
				ds->texMaxs[ j ] = v;
		}
	}
	
	/* calc ranges */
	for( j = 0; j < 2; j++ )
		ds->texRange[ j ] = (ds->texMaxs[ j ] - ds->texMins[ j ]);
	
	/* if range is zero, then assume unlimited precision */
	if( texRange == 0 )
		return qtrue;
	
	/* within range? */
	for( j = 0; j < 2; j++ )
	{
		if( ds->texMins[ j ] < -texRange || ds->texMaxs[ j ] > texRange )
			return qfalse;
	}
	
	/* within range */
	return qtrue;
}



/*
CalcLightmapAxis() - ydnar
gives closed lightmap axis for a plane normal
*/

qboolean CalcLightmapAxis( vec3_t normal, vec3_t axis )
{
	vec3_t	absolute;
		
	
	/* test */
	if( normal[ 0 ] == 0.0f && normal[ 1 ] == 0.0f && normal[ 2 ] == 0.0f )
	{
		VectorClear( axis );
		return qfalse;
	}
	
	/* get absolute normal */
	absolute[ 0 ] = fabs( normal[ 0 ] );
	absolute[ 1 ] = fabs( normal[ 1 ] );
	absolute[ 2 ] = fabs( normal[ 2 ] );
	
	/* test and set */
	if( absolute[ 2 ] > absolute[ 0 ] - 0.0001f && absolute[ 2 ] > absolute[ 1 ] - 0.0001f )
	{
		if( normal[ 2 ] > 0.0f )
			VectorSet( axis, 0.0f, 0.0f, 1.0f );
		else
			VectorSet( axis, 0.0f, 0.0f, -1.0f );
	}
	else if( absolute[ 0 ] > absolute[ 1 ] - 0.0001f && absolute[ 0 ] > absolute[ 2 ] - 0.0001f )
	{
		if( normal[ 0 ] > 0.0f )
			VectorSet( axis, 1.0f, 0.0f, 0.0f );
		else
			VectorSet( axis, -1.0f, 0.0f, 0.0f );
	}
	else
	{
		if( normal[ 1 ] > 0.0f )
			VectorSet( axis, 0.0f, 1.0f, 0.0f );
		else
			VectorSet( axis, 0.0f, -1.0f, 0.0f );
	}
	
	/* return ok */
	return qtrue;
}



/*
ClassifySurfaces() - ydnar
fills out a bunch of info in the surfaces, including planar status, lightmap projection, and bounding box
*/

#define PLANAR_EPSILON	0.5f	//% 0.126f 0.25f

void ClassifySurfaces( int numSurfs, mapDrawSurface_t *ds )
{
	int					i, bestAxis;
	float				dist;
	vec4_t				plane;
	shaderInfo_t		*si;
	static vec3_t		axii[ 6 ] =
						{
							{ 0, 0, -1 },
							{ 0, 0, 1 },
							{ -1, 0, 0 },
							{ 1, 0, 0 },
							{ 0, -1, 0 },
							{ 0, 1, 0 }
						};
	
	
	/* walk the list of surfaces */
	for( ; numSurfs > 0; numSurfs--, ds++ )
	{
		/* ignore bogus (or flare) surfaces */
		if( ds->type == SURFACE_BAD || ds->numVerts <= 0 )
			continue;
		
		/* get shader */
		si = ds->shaderInfo;
		
		/* -----------------------------------------------------------------
		   force meta if vertex count is too high or shader requires it
		   ----------------------------------------------------------------- */
		
		if( ds->type != SURFACE_PATCH && ds->type != SURFACE_FACE )
		{
			if( ds->numVerts > SHADER_MAX_VERTEXES )
				ds->type = SURFACE_FORCED_META;
		}
		
		/* -----------------------------------------------------------------
		   plane and bounding box classification 
		   ----------------------------------------------------------------- */
		
		/* set surface bounding box */
		ClearBounds( ds->mins, ds->maxs );
		for( i = 0; i < ds->numVerts; i++ )
			AddPointToBounds( ds->verts[ i ].xyz, ds->mins, ds->maxs );
		
		/* try to get an existing plane */
		if( ds->planeNum >= 0 )
		{
			VectorCopy( mapplanes[ ds->planeNum ].normal, plane );
			plane[ 3 ] = mapplanes[ ds->planeNum ].dist;
		}
		
		/* construct one from the first vert with a valid normal */
		else
		{
			VectorClear( plane );
			plane[ 3 ] = 0.0f;
			for( i = 0; i < ds->numVerts; i++ )
			{
				if( ds->verts[ i ].normal[ 0 ] != 0.0f && ds->verts[ i ].normal[ 1 ] != 0.0f && ds->verts[ i ].normal[ 2 ] != 0.0f )
				{
					VectorCopy( ds->verts[ i ].normal, plane );
					plane[ 3 ] = DotProduct( ds->verts[ i ].xyz, plane );
					break;
				}
			}
		}
		
		/* test for bogus plane */
		if( VectorLength( plane ) <= 0.0f )
		{
			ds->planar = qfalse;
			ds->planeNum = -1;
		}
		else
		{
			/* determine if surface is planar */
			ds->planar = qtrue;
			
			/* test each vert */
			for( i = 0; i < ds->numVerts; i++ )
			{
				/* point-plane test */
				dist = DotProduct( ds->verts[ i ].xyz, plane ) - plane[ 3 ];
				if( fabs( dist ) > PLANAR_EPSILON )
				{
					//%	if( ds->planeNum >= 0 )
					//%	{
					//%		Sys_Printf( "WARNING: Planar surface marked unplanar (%f > %f)\n", fabs( dist ), PLANAR_EPSILON );
					//%		ds->verts[ i ].color[ 0 ][ 0 ] = ds->verts[ i ].color[ 0 ][ 2 ] = 0;
					//%	}
					ds->planar = qfalse;
					break;
				}
			}
		}
		
		/* find map plane if necessary */
		if( ds->planar )
		{
			if( ds->planeNum < 0 )
				ds->planeNum = FindFloatPlane( plane, plane[ 3 ], 1, &ds->verts[ 0 ].xyz );
			VectorCopy( plane, ds->lightmapVecs[ 2 ] );
		}
		else
		{
			ds->planeNum = -1;
			VectorClear( ds->lightmapVecs[ 2 ] );
			//% if( ds->type == SURF_META || ds->type == SURF_FACE )
			//%		Sys_Printf( "WARNING: Non-planar face (%d): %s\n", ds->planeNum, ds->shaderInfo->shader );
		}
		
		/* -----------------------------------------------------------------
		   lightmap bounds and axis projection
		   ----------------------------------------------------------------- */
		
		/* vertex lit surfaces don't need this information */
		if( si->compileFlags & C_VERTEXLIT || ds->type == SURFACE_TRIANGLES )
		{
			VectorClear( ds->lightmapAxis );
			//%	VectorClear( ds->lightmapVecs[ 2 ] );
			ds->sampleSize = 0;
			continue;
		}
		
		/* the shader can specify an explicit lightmap axis */
		if( si->lightmapAxis[ 0 ] || si->lightmapAxis[ 1 ] || si->lightmapAxis[ 2 ] )
			VectorCopy( si->lightmapAxis, ds->lightmapAxis );
		else if( ds->type == SURFACE_FORCED_META )
			VectorClear( ds->lightmapAxis );
		else if( ds->planar )
			CalcLightmapAxis( plane, ds->lightmapAxis );
		else
		{
			/* find best lightmap axis */
			for( bestAxis = 0; bestAxis < 6; bestAxis++ )
			{
				for( i = 0; i < ds->numVerts && bestAxis < 6; i++ )
				{
					//% Sys_Printf( "Comparing %1.3f %1.3f %1.3f to %1.3f %1.3f %1.3f\n",
					//% 	ds->verts[ i ].normal[ 0 ], ds->verts[ i ].normal[ 1 ], ds->verts[ i ].normal[ 2 ],
					//% 	axii[ bestAxis ][ 0 ], axii[ bestAxis ][ 1 ], axii[ bestAxis ][ 2 ] );
					if( DotProduct( ds->verts[ i ].normal, axii[ bestAxis ] ) < 0.25f )	/* fixme: adjust this tolerance to taste */
						break;
				}
				
				if( i == ds->numVerts )
					break;
			}
			
			/* set axis if possible */
			if( bestAxis < 6 )
			{
				//% if( ds->type == SURFACE_PATCH )
				//% 	Sys_Printf( "Mapped axis %d onto patch\n", bestAxis );
				VectorCopy( axii[ bestAxis ], ds->lightmapAxis );
			}
			
			/* debug code */
			//% if( ds->type == SURFACE_PATCH )
			//% 	Sys_Printf( "Failed to map axis %d onto patch\n", bestAxis );
		}
		
		/* get lightmap sample size */
		if( ds->sampleSize <= 0 )
		{
 			ds->sampleSize = sampleSize;
 			if( ds->shaderInfo->lightmapSampleSize )
 				ds->sampleSize = ds->shaderInfo->lightmapSampleSize;
			if( ds->lightmapScale > 0 )
				ds->sampleSize *= ds->lightmapScale;
			if( ds->sampleSize <= 0 )
				ds->sampleSize = 1;
			else if( ds->sampleSize > 16384 )	/* powers of 2 are preferred */
				ds->sampleSize = 16384;
		}
	}
}



/*
ClassifyEntitySurfaces() - ydnar
classifies all surfaces in an entity
*/

void ClassifyEntitySurfaces( entity_t *e )
{
	int		i;
	
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- ClassifyEntitySurfaces ---\n" );
	
	/* walk the surface list */
	for( i = e->firstDrawSurf; i < numMapDrawSurfs; i++ )
	{
		FinishSurface( &mapDrawSurfs[ i ] );
		ClassifySurfaces( 1, &mapDrawSurfs[ i ] );
	}
	
	/* tidy things up */
	TidyEntitySurfaces( e );
}



/*
GetShaderIndexForPoint() - ydnar
for shader-indexed surfaces (terrain), find a matching index from the indexmap
*/

byte GetShaderIndexForPoint( indexMap_t *im, vec3_t eMins, vec3_t eMaxs, vec3_t point )
{
	int			i, x, y;
	float		s, t;
	vec3_t		mins, maxs, size;
	
	
	/* early out if no indexmap */
	if( im == NULL )
		return 0;
	
	/* this code is really broken */
	#if 0
		/* legacy precision fudges for terrain */
		for( i = 0; i < 3; i++ )
		{
			mins[ i ] = floor( eMins[ i ] + 0.1 );
			maxs[ i ] = floor( eMaxs[ i ] + 0.1 );
			size[ i ] = maxs[ i ] - mins[ i ];
		}
		
		/* find st (fixme: support more than just z-axis projection) */
		s = floor( point[ 0 ] + 0.1f - mins[ 0 ] ) / size[ 0 ];
		t = floor( maxs[ 1 ] - point[ 1 ] + 0.1f ) / size[ 1 ];
		if( s < 0.0f )
			s = 0.0f;
		else if( s > 1.0f )
			s = 1.0f;
		if( t < 0.0f )
			t = 0.0f;
		else if( t > 1.0f )
			t = 1.0f;
		
		/* make xy */
		x = (im->w - 1) * s;
		y = (im->h - 1) * t;
	#else
		/* get size */
		for( i = 0; i < 3; i++ )
		{
			mins[ i ] = eMins[ i ];
			maxs[ i ] = eMaxs[ i ];
			size[ i ] = maxs[ i ] - mins[ i ];
		}
		
		/* calc st */
		s = (point[ 0 ] - mins[ 0 ]) / size[ 0 ];
		t = (maxs[ 1 ] - point[ 1 ]) / size[ 1 ];
		
		/* calc xy */
		x = s * im->w;
		y = t * im->h;
		if( x < 0 )
			x = 0;
		else if( x > (im->w - 1) )
			x = (im->w - 1);
		if( y < 0 )
			y = 0;
		else if( y > (im->h - 1) )
			y = (im->h - 1);
	#endif
	
	/* return index */
	return im->pixels[ y * im->w + x ];
}



/*
GetIndexedShader() - ydnar
for a given set of indexes and an indexmap, get a shader and set the vertex alpha in-place
this combines a couple different functions from terrain.c
*/

shaderInfo_t *GetIndexedShader( shaderInfo_t *parent, indexMap_t *im, int numPoints, byte *shaderIndexes )
{
	int				i;
	byte			minShaderIndex, maxShaderIndex;
	char			shader[ MAX_QPATH ];
	shaderInfo_t	*si;
	
	
	/* early out if bad data */
	if( im == NULL || numPoints <= 0 || shaderIndexes == NULL )
		return ShaderInfoForShader( "default" );
	
	/* determine min/max index */
	minShaderIndex = 255;
	maxShaderIndex = 0;
	for( i = 0; i < numPoints; i++ )
	{
		if( shaderIndexes[ i ] < minShaderIndex )
			minShaderIndex = shaderIndexes[ i ];
		if( shaderIndexes[ i ] > maxShaderIndex )
			maxShaderIndex = shaderIndexes[ i ];
	}
	
	/* set alpha inline */
	for( i = 0; i < numPoints; i++ )
	{
		/* straight rip from terrain.c */
		if( shaderIndexes[ i ] < maxShaderIndex )
			shaderIndexes[ i ] = 0;
		else
			shaderIndexes[ i ] = 255;
	}
	
	/* make a shader name */
	if( minShaderIndex == maxShaderIndex )
		sprintf( shader, "textures/%s_%d", im->shader, maxShaderIndex );
	else
		sprintf( shader, "textures/%s_%dto%d", im->shader, minShaderIndex, maxShaderIndex );
	
	/* get the shader */
	si = ShaderInfoForShader( shader );
	
	/* inherit a few things from parent shader */
	if( parent->globalTexture )
		si->globalTexture = qtrue;
	if( parent->forceMeta )
		si->forceMeta = qtrue;
	if( parent->nonplanar )
		si->nonplanar = qtrue;
	if( si->shadeAngleDegrees == 0.0 )
		si->shadeAngleDegrees = parent->shadeAngleDegrees;
	if( parent->tcGen && si->tcGen == qfalse )
	{
		/* set xy texture projection */
		si->tcGen = qtrue;
		VectorCopy( parent->vecs[ 0 ], si->vecs[ 0 ] );
		VectorCopy( parent->vecs[ 1 ], si->vecs[ 1 ] );
	}
	if( VectorLength( parent->lightmapAxis ) > 0.0f && VectorLength( si->lightmapAxis ) <= 0.0f )
	{
		/* set lightmap projection axis */
		VectorCopy( parent->lightmapAxis, si->lightmapAxis );
	}
	
	/* return the shader */
	return si;
}




/*
DrawSurfaceForSide()
creates a SURF_FACE drawsurface from a given brush side and winding
*/

#define	SNAP_FLOAT_TO_INT	8
#define	SNAP_INT_TO_FLOAT	(1.0 / SNAP_FLOAT_TO_INT)

mapDrawSurface_t *DrawSurfaceForSide( entity_t *e, brush_t *b, side_t *s, winding_t *w )
{
	int					i, j, k;
	mapDrawSurface_t	*ds;
	shaderInfo_t		*si, *parent;
	bspDrawVert_t		*dv;
	vec3_t				texX, texY;
	vec_t				x, y;
	vec3_t				vTranslated;
	qboolean			indexed;
	byte				shaderIndexes[ 256 ];
	float				offsets[ 256 ];
	char				tempShader[ MAX_QPATH ];

	
	/* ydnar: don't make a drawsurf for culled sides */
	if( s->culled )
		return NULL;
	
	/* range check */
	if( w->numpoints > MAX_POINTS_ON_WINDING )
		Error( "DrawSurfaceForSide: w->numpoints = %d (> %d)", w->numpoints, MAX_POINTS_ON_WINDING );
	
	/* get shader */
	si = s->shaderInfo;
	
	/* ydnar: gs mods: check for indexed shader */
	if( si->indexed && b->im != NULL )
	{
		/* indexed */
		indexed = qtrue;
		
		/* get shader indexes for each point */
		for( i = 0; i < w->numpoints; i++ )
		{
			shaderIndexes[ i ] = GetShaderIndexForPoint( b->im, b->eMins, b->eMaxs, w->p[ i ] );
			offsets[ i ] = b->im->offsets[ shaderIndexes[ i ] ];
			//%	Sys_Printf( "%f ", offsets[ i ] );
		}
		
		/* get matching shader and set alpha */
		parent = si;
		si = GetIndexedShader( parent, b->im, w->numpoints, shaderIndexes );
	}
	else
		indexed = qfalse;
	
	/* ydnar: sky hack/fix for GL_CLAMP borders on ati cards */
	if( skyFixHack && si->skyParmsImageBase[ 0 ] != '\0' )
	{
		//%	Sys_FPrintf( SYS_VRB, "Enabling sky hack for shader %s using env %s\n", si->shader, si->skyParmsImageBase );
		sprintf( tempShader, "%s_lf", si->skyParmsImageBase );
		DrawSurfaceForShader( tempShader );
		sprintf( tempShader, "%s_rt", si->skyParmsImageBase );
		DrawSurfaceForShader( tempShader );
		sprintf( tempShader, "%s_ft", si->skyParmsImageBase );
		DrawSurfaceForShader( tempShader );
		sprintf( tempShader, "%s_bk", si->skyParmsImageBase );
		DrawSurfaceForShader( tempShader );
		sprintf( tempShader, "%s_up", si->skyParmsImageBase );
		DrawSurfaceForShader( tempShader );
		sprintf( tempShader, "%s_dn", si->skyParmsImageBase );
		DrawSurfaceForShader( tempShader );
	}
	
	/* ydnar: gs mods */
	ds = AllocDrawSurface( SURFACE_FACE );
	ds->entityNum = b->entityNum;
	ds->castShadows = b->castShadows;
	ds->recvShadows = b->recvShadows;
	
	ds->planar = qtrue;
	ds->planeNum = s->planenum;
	VectorCopy( mapplanes[ s->planenum ].normal, ds->lightmapVecs[ 2 ] );
	
	ds->shaderInfo = si;
	ds->mapBrush = b;
	ds->sideRef = AllocSideRef( s, NULL );
	ds->fogNum = -1;
	ds->lightmapScale = b->lightmapScale;
	ds->numVerts = w->numpoints;
	ds->verts = safe_malloc( ds->numVerts * sizeof( *ds->verts ) );
	memset( ds->verts, 0, ds->numVerts * sizeof( *ds->verts ) );
	
	/* compute s/t coordinates from brush primitive texture matrix (compute axis base) */
	ComputeAxisBase( mapplanes[ s->planenum ].normal, texX, texY );
	
	/* create the vertexes */
	for( j = 0; j < w->numpoints; j++ )
	{
		/* get the drawvert */
		dv = ds->verts + j;
		
		/* copy xyz and do potential z offset */
		VectorCopy( w->p[ j ], dv->xyz );
		if( indexed )
			dv->xyz[ 2 ] += offsets[ j ];
		
		/* round the xyz to a given precision and translate by origin */
		for( i = 0 ; i < 3 ; i++ )
			dv->xyz[ i ] = SNAP_INT_TO_FLOAT * floor( dv->xyz[ i ] * SNAP_FLOAT_TO_INT + 0.5f );
		VectorAdd( dv->xyz, e->origin, vTranslated );
		
		/* ydnar: tek-fu celshading support for flat shaded shit */
		if( flat )
		{
			dv->st[ 0 ] = si->stFlat[ 0 ];
			dv->st[ 1 ] = si->stFlat[ 1 ];
		}
		
		/* ydnar: gs mods: added support for explicit shader texcoord generation */
		else if( si->tcGen )
		{
			dv->st[ 0 ] = DotProduct( si->vecs[ 0 ], vTranslated );
			dv->st[ 1 ] = DotProduct( si->vecs[ 1 ], vTranslated );
		}
		
		/* old quake-style texturing */
		else if( g_bBrushPrimit == BPRIMIT_OLDBRUSHES )
		{
			/* nearest-axial projection */
			dv->st[ 0 ] = s->vecs[ 0 ][ 3 ] + DotProduct( s->vecs[ 0 ], vTranslated );
			dv->st[ 1 ] = s->vecs[ 1 ][ 3 ] + DotProduct( s->vecs[ 1 ], vTranslated );
			dv->st[ 0 ] /= si->shaderWidth;
			dv->st[ 1 ] /= si->shaderHeight;
		}
		
		/* brush primitive texturing */
		else
		{
			/* calculate texture s/t from brush primitive texture matrix */
			x = DotProduct( vTranslated, texX );
			y = DotProduct( vTranslated, texY );
			dv->st[ 0 ] = s->texMat[ 0 ][ 0 ] * x + s->texMat[ 0 ][ 1 ] * y + s->texMat[ 0 ][ 2 ];
			dv->st[ 1 ] = s->texMat[ 1 ][ 0 ] * x + s->texMat[ 1 ][ 1 ] * y + s->texMat[ 1 ][ 2 ];
		}
		
		/* copy normal */
		VectorCopy( mapplanes[ s->planenum ].normal, dv->normal );
		
		/* ydnar: set color */
		for( k = 0; k < MAX_LIGHTMAPS; k++ )
		{
			dv->color[ k ][ 0 ] = 255;
			dv->color[ k ][ 1 ] = 255;
			dv->color[ k ][ 2 ] = 255;
			
			/* ydnar: gs mods: handle indexed shader blending */
			dv->color[ k ][ 3 ] = (indexed ? shaderIndexes[ j ] : 255);
		}
	}
	
	/* set cel shader */
	ds->celShader = b->celShader;
	
	/* ydnar: gs mods: moved st biasing elsewhere */
	return ds;
}



/*
DrawSurfaceForMesh()
moved here from patch.c
*/

#define YDNAR_NORMAL_EPSILON 0.50f

qboolean VectorCompareExt( vec3_t n1, vec3_t n2, float epsilon )
{
	int		i;
	
	
	/* test */
	for( i= 0; i < 3; i++ )
		if( fabs( n1[ i ] - n2[ i ]) > epsilon )
			return qfalse;
	return qtrue;
}

mapDrawSurface_t *DrawSurfaceForMesh( entity_t *e, parseMesh_t *p, mesh_t *mesh )
{
	int					i, k, numVerts;
	vec4_t				plane;
	qboolean			planar;
	float				dist;
	mapDrawSurface_t	*ds;
	shaderInfo_t		*si, *parent;
	bspDrawVert_t		*dv;
	vec3_t				vTranslated;
	mesh_t				*copy;
	qboolean			indexed;
	byte				shaderIndexes[ MAX_EXPANDED_AXIS * MAX_EXPANDED_AXIS ];
	float				offsets[ MAX_EXPANDED_AXIS * MAX_EXPANDED_AXIS ];
	
	
	/* get mesh and shader shader */
	if( mesh == NULL )
		mesh = &p->mesh;
	si = p->shaderInfo;
	if( mesh == NULL || si == NULL )
		return NULL;
	
	/* get vertex count */
	numVerts = mesh->width * mesh->height;
	
	/* to make valid normals for patches with degenerate edges,
	   we need to make a copy of the mesh and put the aproximating
	   points onto the curve */
	
	/* create a copy of the mesh */
	copy = CopyMesh( mesh );
	
	/* store off the original (potentially bad) normals */
	MakeMeshNormals( *copy );
	for( i = 0; i < numVerts; i++ )
		VectorCopy( copy->verts[ i ].normal, mesh->verts[ i ].normal );
	
	/* put the mesh on the curve */
	PutMeshOnCurve( *copy );

	/* find new normals (to take into account degenerate/flipped edges */
	MakeMeshNormals( *copy );
	for( i = 0; i < numVerts; i++ )
	{
		/* ydnar: only copy normals that are significantly different from the originals */
		if( DotProduct( copy->verts[ i ].normal, mesh->verts[ i ].normal ) < 0.75f )
			VectorCopy( copy->verts[ i ].normal, mesh->verts[ i ].normal );
	}
	
	/* free the old mesh */
	FreeMesh( copy );
	
	/* ydnar: gs mods: check for indexed shader */
	if( si->indexed && p->im != NULL )
	{
		/* indexed */
		indexed = qtrue;

		/* get shader indexes for each point */
		for( i = 0; i < numVerts; i++ )
		{
			shaderIndexes[ i ] = GetShaderIndexForPoint( p->im, p->eMins, p->eMaxs, mesh->verts[ i ].xyz );
			offsets[ i ] = p->im->offsets[ shaderIndexes[ i ] ];
		}
		
		/* get matching shader and set alpha */
		parent = si;
		si = GetIndexedShader( parent, p->im, numVerts, shaderIndexes );
	}
	else
		indexed = qfalse;
	
	
	/* ydnar: gs mods */
	ds = AllocDrawSurface( SURFACE_PATCH );
	ds->entityNum = p->entityNum;
	ds->castShadows = p->castShadows;
	ds->recvShadows = p->recvShadows;
	
	ds->shaderInfo = si;
	ds->mapMesh = p;
	ds->lightmapScale = p->lightmapScale;	/* ydnar */
	ds->patchWidth = mesh->width;
	ds->patchHeight = mesh->height;
	ds->numVerts = ds->patchWidth * ds->patchHeight;
	ds->verts = safe_malloc( ds->numVerts * sizeof( *ds->verts ) );
	memcpy( ds->verts, mesh->verts, ds->numVerts * sizeof( *ds->verts ) );
	
	ds->fogNum = -1;
	ds->planeNum = -1;
	
	ds->longestCurve = p->longestCurve;
	ds->maxIterations = p->maxIterations;
	
	/* construct a plane from the first vert */
	VectorCopy( mesh->verts[ 0 ].normal, plane );
	plane[ 3 ] = DotProduct( mesh->verts[ 0 ].xyz, plane );
	planar = qtrue;
	
	/* spew forth errors */
	if( VectorLength( plane ) < 0.001f )
		Sys_Printf( "BOGUS " );
	
	/* test each vert */
	for( i = 1; i < ds->numVerts && planar; i++ )
	{
		/* normal test */
		if( VectorCompare( plane, mesh->verts[ i ].normal ) == qfalse )
			planar = qfalse;
		
		/* point-plane test */
		dist = DotProduct( mesh->verts[ i ].xyz, plane ) - plane[ 3 ];
		if( fabs( dist ) > EQUAL_EPSILON )
			planar = qfalse;
	}
	
	/* add a map plane */
	if( planar )
	{
		/* make a map plane */
		ds->planeNum = FindFloatPlane( plane, plane[ 3 ], 1, &mesh->verts[ 0 ].xyz );
		VectorCopy( plane, ds->lightmapVecs[ 2 ] );
		
		/* push this normal to all verts (ydnar 2003-02-14: bad idea, small patches get screwed up) */
		for( i = 0; i < ds->numVerts; i++ )
			VectorCopy( plane, ds->verts[ i ].normal );
	}
	
	/* walk the verts to do special stuff */
	for( i = 0; i < ds->numVerts; i++ )
	{
		/* get the drawvert */
		dv = &ds->verts[ i ];
		
		/* ydnar: tek-fu celshading support for flat shaded shit */
		if( flat )
		{
			dv->st[ 0 ] = si->stFlat[ 0 ];
			dv->st[ 1 ] = si->stFlat[ 1 ];
		}
		
		/* ydnar: gs mods: added support for explicit shader texcoord generation */
		else if( si->tcGen )
		{
			/* translate by origin and project the texture */
			VectorAdd( dv->xyz, e->origin, vTranslated );
			dv->st[ 0 ] = DotProduct( si->vecs[ 0 ], vTranslated );
			dv->st[ 1 ] = DotProduct( si->vecs[ 1 ], vTranslated );
		}
		
		/* ydnar: set color */
		for( k = 0; k < MAX_LIGHTMAPS; k++ )
		{
			dv->color[ k ][ 0 ] = 255;
			dv->color[ k ][ 1 ] = 255;
			dv->color[ k ][ 2 ] = 255;
			
			/* ydnar: gs mods: handle indexed shader blending */
			dv->color[ k ][ 3 ] = (indexed ? shaderIndexes[ i ] : 255);
		}
		
		/* ydnar: offset */
		if( indexed )
			dv->xyz[ 2 ] += offsets[ i ];
	}
	
	/* set cel shader */
	ds->celShader = p->celShader;
	
	/* return the drawsurface */
	return ds;
}



/*
DrawSurfaceForFlare() - ydnar
creates a flare draw surface
*/

mapDrawSurface_t *DrawSurfaceForFlare( int entNum, vec3_t origin, vec3_t normal, vec3_t color, char *flareShader, int lightStyle )
{
	mapDrawSurface_t	*ds;
	
	
	/* emit flares? */
	if( emitFlares == qfalse )
		return NULL;
	
	/* allocate drawsurface */
	ds = AllocDrawSurface( SURFACE_FLARE );
	ds->entityNum = entNum;
	
	/* set it up */
	if( flareShader != NULL && flareShader[ 0 ] != '\0' )
		ds->shaderInfo = ShaderInfoForShader( flareShader );
	else
		ds->shaderInfo = ShaderInfoForShader( game->flareShader );
	if( origin != NULL )
		VectorCopy( origin, ds->lightmapOrigin );
	if( normal != NULL )
		VectorCopy( normal, ds->lightmapVecs[ 2 ] );
	if( color != NULL )
		VectorCopy( color, ds->lightmapVecs[ 0 ] );
	
	/* store light style */
	ds->lightStyle = lightStyle;
	if( ds->lightStyle < 0 || ds->lightStyle >= LS_NONE )
		ds->lightStyle = LS_NORMAL;
	
	/* fixme: fog */
	
	/* return to sender */
	return ds;
}



/*
DrawSurfaceForShader() - ydnar
creates a bogus surface to forcing the game to load a shader
*/

mapDrawSurface_t *DrawSurfaceForShader( char *shader )
{
	int					i;
	shaderInfo_t		*si;
	mapDrawSurface_t	*ds;
	
	
	/* get shader */
	si = ShaderInfoForShader( shader );

	/* find existing surface */
	for( i = 0; i < numMapDrawSurfs; i++ )
	{
		/* get surface */
		ds = &mapDrawSurfs[ i ];
		
		/* check it */
		if( ds->shaderInfo == si )
			return ds;
	}
	
	/* create a new surface */
	ds = AllocDrawSurface( SURFACE_SHADER );
	ds->entityNum = 0;
	ds->shaderInfo = ShaderInfoForShader( shader );
	
	/* return to sender */
	return ds;
}



/*
AddSurfaceFlare() - ydnar
creates flares (coronas) centered on surfaces
*/

static void AddSurfaceFlare( mapDrawSurface_t *ds, vec3_t entityOrigin )
{
	vec3_t				origin;
	int					i;
	
	
	/* find centroid */
	VectorClear( origin );
	for ( i = 0; i < ds->numVerts; i++ )
		VectorAdd( origin, ds->verts[ i ].xyz, origin );
	VectorScale( origin, (1.0f / ds->numVerts), origin );
	if( entityOrigin != NULL )
		VectorAdd( origin, entityOrigin, origin );
	
	/* push origin off surface a bit */
	VectorMA( origin, 2.0f,  ds->lightmapVecs[ 2 ], origin );
	
	/* create the drawsurface */
	DrawSurfaceForFlare( ds->entityNum, origin, ds->lightmapVecs[ 2 ], ds->shaderInfo->color, ds->shaderInfo->flareShader, ds->shaderInfo->lightStyle );
}



/*
SubdivideFace()
subdivides a face surface until it is smaller than the specified size (subdivisions)
*/

static void SubdivideFace_r( entity_t *e, brush_t *brush, side_t *side, winding_t *w, int fogNum, float subdivisions )
{
	int					i;
	int					axis;
	vec3_t				bounds[ 2 ];
	const float			epsilon = 0.1;
	int					subFloor, subCeil;
	winding_t			*frontWinding, *backWinding;
	mapDrawSurface_t	*ds;
	
	
	/* dummy check */
	if( w == NULL )
		return;
	if( w->numpoints < 3 )
		Error( "SubdivideFace_r: Bad w->numpoints (%d < 3)", w->numpoints );
	
	/* determine surface bounds */
	ClearBounds( bounds[ 0 ], bounds[ 1 ] );
	for( i = 0; i < w->numpoints; i++ )
		AddPointToBounds( w->p[ i ], bounds[ 0 ], bounds[ 1 ] );
	
	/* split the face */
	for( axis = 0; axis < 3; axis++ )
	{
		vec3_t			planePoint = { 0, 0, 0 };
		vec3_t			planeNormal = { 0, 0, 0 };
		float			d;
		
		
		/* create an axial clipping plane */
		subFloor = floor( bounds[ 0 ][ axis ] / subdivisions) * subdivisions;
		subCeil = ceil( bounds[ 1 ][ axis ] / subdivisions) * subdivisions;
		planePoint[ axis ] = subFloor + subdivisions;
		planeNormal[ axis ] = -1;
		d = DotProduct( planePoint, planeNormal );

		/* subdivide if necessary */
		if( (subCeil - subFloor) > subdivisions )
		{
			/* clip the winding */
			ClipWindingEpsilon( w, planeNormal, d, epsilon, &frontWinding, &backWinding );

			/* the clip may not produce two polygons if it was epsilon close */
			if( frontWinding == NULL )
				w = backWinding;
			else if( backWinding == NULL )
				w = frontWinding;
			else
			{
				SubdivideFace_r( e, brush, side, frontWinding, fogNum, subdivisions );
				SubdivideFace_r( e, brush, side, backWinding, fogNum, subdivisions );
				return;
			}
		}
	}
	
	/* create a face surface */
	ds = DrawSurfaceForSide( e, brush, side, w );
	
	/* set correct fog num */
	ds->fogNum = fogNum;
}



/*
SubdivideFaceSurfaces()
chop up brush face surfaces that have subdivision attributes
ydnar: and subdivide surfaces that exceed specified texture coordinate range
*/

void SubdivideFaceSurfaces( entity_t *e, tree_t *tree )
{
	int					i, j, numBaseDrawSurfs, fogNum;
	mapDrawSurface_t	*ds;
	brush_t				*brush;
	side_t				*side;
	shaderInfo_t		*si;
	winding_t			*w;
	float				range, size, subdivisions, s2;
	
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- SubdivideFaceSurfaces ---\n" );
	
	/* walk the list of surfaces */
	numBaseDrawSurfs = numMapDrawSurfs;
	for( i = e->firstDrawSurf; i < numBaseDrawSurfs; i++ )
	{
		/* get surface */
		ds = &mapDrawSurfs[ i ];

		/* only subdivide brush sides */
		if( ds->type != SURFACE_FACE || ds->mapBrush == NULL || ds->sideRef == NULL || ds->sideRef->side == NULL )
			continue;
		
		/* get bits */
		brush = ds->mapBrush;
		side = ds->sideRef->side;
		
		/* check subdivision for shader */
		si = side->shaderInfo;
		if( si == NULL )
			continue;
		
		/* ydnar: don't subdivide sky surfaces */
		if( si->compileFlags & C_SKY )
			continue;
		
		/* do texture coordinate range check */
		ClassifySurfaces( 1, ds );
		if( CalcSurfaceTextureRange( ds ) == qfalse )
		{
			/* calculate subdivisions texture range (this code is shit) */
			range = (ds->texRange[ 0 ] > ds->texRange[ 1 ] ? ds->texRange[ 0 ] : ds->texRange[ 1 ]);
			size = ds->maxs[ 0 ] - ds->mins[ 0 ];
			for( j = 1; j < 3; j++ )
				if( (ds->maxs[ j ] - ds->mins[ j ]) > size )
					size = ds->maxs[ j ] - ds->mins[ j ];
			subdivisions = (size / range) * texRange;
			subdivisions = ceil( subdivisions / 2 ) * 2;
			for( j = 1; j < 8; j++ )
			{
				s2 = ceil( (float) texRange / j );
				if( fabs( subdivisions - s2 ) <= 4.0 )
				{
					subdivisions = s2;
					break;
				}
			}
		}
		else
			subdivisions = si->subdivisions;
		
		/* get subdivisions from shader */
		if(	si->subdivisions > 0 && si->subdivisions < subdivisions )
			subdivisions = si->subdivisions;
		if( subdivisions < 1.0f )
			continue;
		
		/* preserve fog num */
		fogNum = ds->fogNum;
		
		/* make a winding and free the surface */
		w = WindingFromDrawSurf( ds );
		ClearSurface( ds );
		
		/* subdivide it */
		SubdivideFace_r( e, brush, side, w, fogNum, subdivisions );
	}
}



/*
====================
ClipSideIntoTree_r

Adds non-opaque leaf fragments to the convex hull
====================
*/

void ClipSideIntoTree_r( winding_t *w, side_t *side, node_t *node )
{
	plane_t			*plane;
	winding_t		*front, *back;

	if ( !w ) {
		return;
	}

	if ( node->planenum != PLANENUM_LEAF ) {
		if ( side->planenum == node->planenum ) {
			ClipSideIntoTree_r( w, side, node->children[0] );
			return;
		}
		if ( side->planenum == ( node->planenum ^ 1) ) {
			ClipSideIntoTree_r( w, side, node->children[1] );
			return;
		}

		plane = &mapplanes[ node->planenum ];
		ClipWindingEpsilon ( w, plane->normal, plane->dist,
				ON_EPSILON, &front, &back );
		FreeWinding( w );

		ClipSideIntoTree_r( front, side, node->children[0] );
		ClipSideIntoTree_r( back, side, node->children[1] );

		return;
	}

	// if opaque leaf, don't add
	if ( !node->opaque ) {
		AddWindingToConvexHull( w, &side->visibleHull, mapplanes[ side->planenum ].normal );
	}

	FreeWinding( w );
	return;
}





static int g_numHiddenFaces, g_numCoinFaces;



/*
CullVectorCompare() - ydnar
compares two vectors with an epsilon
*/

#define CULL_EPSILON 0.1f

qboolean CullVectorCompare( const vec3_t v1, const vec3_t v2 )
{
	int		i;
	
	
	for( i = 0; i < 3; i++ )
		if( fabs( v1[ i ] - v2[ i ] ) > CULL_EPSILON )
			return qfalse;
	return qtrue;
}



/*
SideInBrush() - ydnar
determines if a brushside lies inside another brush
*/

qboolean SideInBrush( side_t *side, brush_t *b )
{
	int			i, s;
	plane_t		*plane;
	
	
	/* ignore sides w/o windings or shaders */
	if( side->winding == NULL || side->shaderInfo == NULL )
		return qtrue;

	/* ignore culled sides and translucent brushes */
	if( side->culled == qtrue || (b->compileFlags & C_TRANSLUCENT) )
		return qfalse;

	/* side iterator */
	for( i = 0; i < b->numsides; i++ )
	{
		/* fail if any sides are caulk */
		if( b->sides[ i ].compileFlags & C_NODRAW )
			return qfalse;

		/* check if side's winding is on or behind the plane */
		plane = &mapplanes[ b->sides[ i ].planenum ];
		s = WindingOnPlaneSide( side->winding, plane->normal, plane->dist );
		if( s == SIDE_FRONT || s == SIDE_CROSS )
			return qfalse;
	}
	
	/* don't cull autosprite or polygonoffset surfaces */
	if( side->shaderInfo )
	{
		if( side->shaderInfo->autosprite || side->shaderInfo->polygonOffset )
			return qfalse;
	}
	
	/* inside */
	side->culled = qtrue;
	g_numHiddenFaces++;
	return qtrue;
}


/*
CullSides() - ydnar
culls obscured or buried brushsides from the map
*/

void CullSides( entity_t *e )
{
	int			numPoints;
	int			i, j, k, l, first, second, dir;
	winding_t	*w1, *w2;
	brush_t	*b1, *b2;
	side_t		*side1, *side2;
	
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- CullSides ---\n" );
	
	g_numHiddenFaces = 0;
	g_numCoinFaces = 0;
	
	/* brush interator 1 */
	for( b1 = e->brushes; b1; b1 = b1->next )
	{
		/* sides check */
		if( b1->numsides < 1 )
			continue;

		/* brush iterator 2 */
		for( b2 = b1->next; b2; b2 = b2->next )
		{
			/* sides check */
			if( b2->numsides < 1 )
				continue;
			
			/* original check */
			if( b1->original == b2->original && b1->original != NULL )
				continue;
			
			/* bbox check */
			j = 0;
			for( i = 0; i < 3; i++ )
				if( b1->mins[ i ] > b2->maxs[ i ] || b1->maxs[ i ] < b2->mins[ i ] )
					j++;
			if( j )
				continue;

			/* cull inside sides */
			for( i = 0; i < b1->numsides; i++ )
				SideInBrush( &b1->sides[ i ], b2 );
			for( i = 0; i < b2->numsides; i++ )
				SideInBrush( &b2->sides[ i ], b1 );
			
			/* side iterator 1 */
			for( i = 0; i < b1->numsides; i++ )
			{
				/* winding check */
				side1 = &b1->sides[ i ];
				w1 = side1->winding;
				if( w1 == NULL )
					continue;
				numPoints = w1->numpoints;
				if( side1->shaderInfo == NULL )
					continue;
				
				/* side iterator 2 */
				for( j = 0; j < b2->numsides; j++ )
				{
					/* winding check */
					side2 = &b2->sides[ j ];
					w2 = side2->winding;
					if( w2 == NULL )
						continue;
					if( side2->shaderInfo == NULL )
						continue;
					if( w1->numpoints != w2->numpoints )
						continue;
					if( side1->culled == qtrue && side2->culled == qtrue )
						continue;
					
					/* compare planes */
					if( (side1->planenum & ~0x00000001) != (side2->planenum & ~0x00000001) )
						continue;
					
					/* get autosprite and polygonoffset status */
					if( side1->shaderInfo &&
						(side1->shaderInfo->autosprite || side1->shaderInfo->polygonOffset) )
						continue;
					if( side2->shaderInfo &&
						(side2->shaderInfo->autosprite || side2->shaderInfo->polygonOffset) )
						continue;
					
					/* find first common point */
					first = -1;
					for( k = 0; k < numPoints; k++ )
					{
						if( VectorCompare( w1->p[ 0 ], w2->p[ k ] ) )
						{
							first = k;
							k = numPoints;
						}
					}
					if( first == -1 )
						continue;
					
					/* find second common point (regardless of winding order) */
					second = -1;
					dir = 0;
					if( (first + 1) < numPoints )
						second = first + 1;
					else
						second = 0;
					if( CullVectorCompare( w1->p[ 1 ], w2->p[ second ] ) )
						dir = 1;
					else
					{
						if( first > 0 )
							second = first - 1;
						else
							second = numPoints - 1;
						if( CullVectorCompare( w1->p[ 1 ], w2->p[ second ] ) )
							dir = -1;
					}
					if( dir == 0 )
						continue;
					
					/* compare the rest of the points */
					l = first;
					for( k = 0; k < numPoints; k++ )
					{
						if( !CullVectorCompare( w1->p[ k ], w2->p[ l ] ) )
							k = 100000;
						
						l += dir;
						if( l < 0 )
							l = numPoints - 1;
						else if( l >= numPoints )
							l = 0;
					}
					if( k >= 100000 )
						continue;
					
					/* cull face 1 */
					if( !side2->culled && !(side2->compileFlags & C_TRANSLUCENT) && !(side2->compileFlags & C_NODRAW) )
					{
						side1->culled = qtrue;
						g_numCoinFaces++;
					}
					
					if( side1->planenum == side2->planenum && side1->culled == qtrue )
						continue;
					
					/* cull face 2 */
					if( !side1->culled && !(side1->compileFlags & C_TRANSLUCENT) && !(side1->compileFlags & C_NODRAW) )
					{
						side2->culled = qtrue;
						g_numCoinFaces++;
					}
				}
			}
		}
	}
	
	/* emit some stats */
	Sys_FPrintf( SYS_VRB, "%9d hidden faces culled\n", g_numHiddenFaces );
	Sys_FPrintf( SYS_VRB, "%9d coincident faces culled\n", g_numCoinFaces );
}




/*
ClipSidesIntoTree()

creates side->visibleHull for all visible sides

the drawsurf for a side will consist of the convex hull of
all points in non-opaque clusters, which allows overlaps
to be trimmed off automatically.
*/

void ClipSidesIntoTree( entity_t *e, tree_t *tree )
{
	brush_t		*b;
	int				i;
	winding_t		*w;
	side_t			*side, *newSide;
	shaderInfo_t	*si;
  
	
	/* ydnar: cull brush sides */
	CullSides( e );
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- ClipSidesIntoTree ---\n" );
	
	/* walk the brush list */
	for( b = e->brushes; b; b = b->next )
	{
		/* walk the brush sides */
		for( i = 0; i < b->numsides; i++ )
		{
			/* get side */
			side = &b->sides[ i ];
			if( side->winding == NULL )
				continue;
			
			/* copy the winding */
			w = CopyWinding( side->winding );
			side->visibleHull = NULL;
			ClipSideIntoTree_r( w, side, tree->headnode );
			
			/* anything left? */
			w = side->visibleHull;
			if( w == NULL )
				continue;
			
			/* shader? */
			si = side->shaderInfo;
			if( si == NULL )
				continue;
			
			/* don't create faces for non-visible sides */
			/* ydnar: except indexed shaders, like common/terrain and nodraw fog surfaces */
			if( (si->compileFlags & C_NODRAW) && si->indexed == qfalse && !(si->compileFlags & C_FOG) )
				continue;
			
			/* always use the original winding for autosprites and noclip faces */
			if( si->autosprite || si->noClip )
				w = side->winding;
			
			/* save this winding as a visible surface */
			DrawSurfaceForSide( e, b, side, w );

			/* make a back side for fog */
			if( !(si->compileFlags & C_FOG) )
				continue;
			
			/* duplicate the up-facing side */
			w = ReverseWinding( w );
			newSide = safe_malloc( sizeof( *side ) );
			*newSide = *side;
			newSide->visibleHull = w;
			newSide->planenum ^= 1;
			
			/* save this winding as a visible surface */
			DrawSurfaceForSide( e, b, newSide, w );
		}
	}
}



/*

this section deals with filtering drawsurfaces into the bsp tree,
adding references to each leaf a surface touches

*/

/*
AddReferenceToLeaf() - ydnar
adds a reference to surface ds in the bsp leaf node
*/

int AddReferenceToLeaf( mapDrawSurface_t *ds, node_t *node )
{
	drawSurfRef_t	*dsr;
	
	
	/* dummy check */
	if( node->planenum != PLANENUM_LEAF || node->opaque )
		return 0;
	
	/* try to find an existing reference */
	for( dsr = node->drawSurfReferences; dsr; dsr = dsr->nextRef )
	{
		if( dsr->outputNum == numBSPDrawSurfaces )
			return 0;
	}
	
	/* add a new reference */
	dsr = safe_malloc( sizeof( *dsr ) );
	dsr->outputNum = numBSPDrawSurfaces;
	dsr->nextRef = node->drawSurfReferences;
	node->drawSurfReferences = dsr;
	
	/* ydnar: sky/skybox surfaces */
	if( node->skybox )
		ds->skybox = qtrue;
	if( ds->shaderInfo->compileFlags & C_SKY )
		node->sky = qtrue;
	
	/* return */
	return 1;
}



/*
AddReferenceToTree_r() - ydnar
adds a reference to the specified drawsurface to every leaf in the tree
*/

int AddReferenceToTree_r( mapDrawSurface_t *ds, node_t *node, qboolean skybox )
{
	int		i, refs = 0;
	
	
	/* dummy check */
	if( node == NULL )
		return 0;
	
	/* is this a decision node? */
	if( node->planenum != PLANENUM_LEAF )
	{
		/* add to child nodes and return */
		refs += AddReferenceToTree_r( ds, node->children[ 0 ], skybox );
		refs += AddReferenceToTree_r( ds, node->children[ 1 ], skybox );
		return refs;
	}
	
	/* ydnar */
	if( skybox )
	{
		/* skybox surfaces only get added to sky leaves */
		if( !node->sky )
			return 0;
		
		/* increase the leaf bounds */
		for( i = 0; i < ds->numVerts; i++ )
			AddPointToBounds( ds->verts[ i ].xyz, node->mins, node->maxs );
	}
	
	/* add a reference */
	return AddReferenceToLeaf( ds, node );
}



/*
FilterPointIntoTree_r() - ydnar
filters a single point from a surface into the tree
*/

int FilterPointIntoTree_r( vec3_t point, mapDrawSurface_t *ds, node_t *node )
{
	float			d;
	plane_t			*plane;
	int				refs = 0;
	
	
	/* is this a decision node? */
	if( node->planenum != PLANENUM_LEAF )
	{
		/* classify the point in relation to the plane */
		plane = &mapplanes[ node->planenum ];
		d = DotProduct( point, plane->normal ) - plane->dist;
		
		/* filter by this plane */
		refs = 0;
		if( d >= -ON_EPSILON )
			refs += FilterPointIntoTree_r( point, ds, node->children[ 0 ] );
		if( d <= ON_EPSILON )
			refs += FilterPointIntoTree_r( point, ds, node->children[ 1 ] );
		
		/* return */
		return refs;
	}
	
	/* add a reference */
	return AddReferenceToLeaf( ds, node );
}



/*
FilterWindingIntoTree_r() - ydnar
filters a winding from a drawsurface into the tree
*/

int FilterWindingIntoTree_r( winding_t *w, mapDrawSurface_t *ds, node_t *node )
{
	int				i, refs = 0;
	plane_t			*p1, *p2;
	vec4_t			plane1, plane2, reverse;
	winding_t		*fat, *front, *back;
	shaderInfo_t	*si;
	
	
	/* get shaderinfo */
	si = ds->shaderInfo;
	
	/* ydnar: is this the head node? */
	if( node->parent == NULL && si != NULL &&
		(si->mins[ 0 ] != 0.0f || si->maxs[ 0 ] != 0.0f ||
		si->mins[ 1 ] != 0.0f || si->maxs[ 1 ] != 0.0f ||
		si->mins[ 2 ] != 0.0f || si->maxs[ 2 ] != 0.0f) )
	{
		/* 'fatten' the winding by the shader mins/maxs (parsed from vertexDeform move) */
		/* note this winding is completely invalid (concave, nonplanar, etc) */
		fat = AllocWinding( w->numpoints * 3 );
		fat->numpoints = w->numpoints * 3;
		for( i = 0; i < w->numpoints; i++ )
		{
			VectorCopy( w->p[ i ], fat->p[ i ] );
			VectorAdd( w->p[ i ], si->mins, fat->p[ i * 2 ] );
			VectorAdd( w->p[ i ], si->maxs, fat->p[ i * 3 ] );
		}
		
		FreeWinding( w );
		w = fat;
	}
	
	/* is this a decision node? */
	if( node->planenum != PLANENUM_LEAF )
	{	
		/* get node plane */
		p1 = &mapplanes[ node->planenum ];
		VectorCopy( p1->normal, plane1 );
		plane1[ 3 ] = p1->dist;
		
		/* check if surface is planar */
		if( ds->planeNum >= 0 )
		{
			/* get surface plane */
			p2 = &mapplanes[ ds->planeNum ];
			VectorCopy( p2->normal, plane2 );
			plane2[ 3 ] = p2->dist;
			
			#if 1
				/* invert surface plane */
				VectorSubtract( vec3_origin, plane2, reverse );
				reverse[ 3 ] = -plane2[ 3 ];
				
				/* compare planes */
				if( DotProduct( plane1, plane2 ) > 0.999f && fabs( plane1[ 3 ] - plane2[ 3 ] ) < 0.001f )
					return FilterWindingIntoTree_r( w, ds, node->children[ 0 ] );
				if( DotProduct( plane1, reverse ) > 0.999f && fabs( plane1[ 3 ] - reverse[ 3 ] ) < 0.001f )
					return FilterWindingIntoTree_r( w, ds, node->children[ 1 ] );
			#else
				/* the drawsurf might have an associated plane, if so, force a filter here */
				if( ds->planeNum == node->planenum )
					return FilterWindingIntoTree_r( w, ds, node->children[ 0 ] );
				if( ds->planeNum == (node->planenum ^ 1) )
					return FilterWindingIntoTree_r( w, ds, node->children[ 1 ] );
			#endif
		}
		
		/* clip the winding by this plane */
		ClipWindingEpsilon( w, plane1, plane1[ 3 ], ON_EPSILON, &front, &back );
		
		/* filter by this plane */
		refs = 0;
		if( front != NULL )
			refs += FilterWindingIntoTree_r( front, ds, node->children[ 0 ] );
		if( back != NULL )
			refs += FilterWindingIntoTree_r( back, ds, node->children[ 1 ] );
		FreeWinding( w );
		
		/* return */
		return refs;
	}
	
	/* add a reference */
	return AddReferenceToLeaf( ds, node );
}



/*
FilterFaceIntoTree()
filters a planar winding face drawsurface into the bsp tree
*/

int	FilterFaceIntoTree( mapDrawSurface_t *ds, tree_t *tree )
{
	winding_t	*w;
	int			refs = 0;
	
	
	/* make a winding and filter it into the tree */
	w = WindingFromDrawSurf( ds );
	refs = FilterWindingIntoTree_r( w, ds, tree->headnode );
	
	/* return */
	return refs;
}



/*
FilterPatchIntoTree()
subdivides a patch into an approximate curve and filters it into the tree
*/

#define	FILTER_SUBDIVISION		8

static int FilterPatchIntoTree( mapDrawSurface_t *ds, tree_t *tree )
{
	int					i, x, y, refs;
	mesh_t				src, *mesh;
	winding_t			*w;
	
	
	/* subdivide the surface */
	src.width = ds->patchWidth;
	src.height = ds->patchHeight;
	src.verts = ds->verts;
	mesh = SubdivideMesh( src, FILTER_SUBDIVISION, 32 );
	
	
	/* filter each quad into the tree (fixme: use new patch x-triangulation code?) */
	refs = 0;
	for( y = 0; y < (mesh->height - 1); y++ )
	{
		for( x = 0; x < (mesh->width - 1); x++ )
		{
			/* triangle 1 */
			w = AllocWinding( 3 );
			w->numpoints = 3;
			VectorCopy( mesh->verts[ y * mesh->width + x ].xyz, w->p[ 0 ] );
			VectorCopy( mesh->verts[ y * mesh->width + x + 1 ].xyz, w->p[ 1 ] );
			VectorCopy( mesh->verts[ (y + 1) * mesh->width + x ].xyz, w->p[ 2 ] );
			refs += FilterWindingIntoTree_r( w, ds, tree->headnode );
			
			/* triangle 2 */
			w = AllocWinding( 3 );
			w->numpoints = 3;
			VectorCopy( mesh->verts[ y * mesh->width + x + 1 ].xyz, w->p[ 0 ] );
			VectorCopy( mesh->verts[ (y + 1 ) * mesh->width + x + 1 ].xyz, w->p[ 1 ] );
			VectorCopy( mesh->verts[ (y + 1 ) * mesh->width + x ].xyz, w->p[ 2 ] );
			refs += FilterWindingIntoTree_r( w, ds, tree->headnode );
		}
	}
	
	/* use point filtering as well */
	for( i = 0; i < (mesh->width * mesh->height); i++ )
		refs += FilterPointIntoTree_r( mesh->verts[ i ].xyz, ds, tree->headnode );
	
	/* free the subdivided mesh and return */
	FreeMesh( mesh );
	return refs;
}



/*
FilterTrianglesIntoTree()
filters a triangle surface (meta, model) into the bsp
*/

static int FilterTrianglesIntoTree( mapDrawSurface_t *ds, tree_t *tree )
{
	int			i, refs;
	winding_t	*w;
	
	
	/* ydnar: gs mods: this was creating bogus triangles before */
	refs = 0;
	for( i = 0; i < ds->numIndexes; i += 3 )
	{
		/* error check */
		if( ds->indexes[ i ] >= ds->numVerts ||
			ds->indexes[ i + 1 ] >= ds->numVerts ||
			ds->indexes[ i + 2 ] >= ds->numVerts )
			Error( "Index %d greater than vertex count %d", ds->indexes[ i ], ds->numVerts );
		
		/* make a triangle winding and filter it into the tree */
		w = AllocWinding( 3 );
		w->numpoints = 3;
		VectorCopy( ds->verts[ ds->indexes[ i ] ].xyz, w->p[ 0 ] );
		VectorCopy( ds->verts[ ds->indexes[ i + 1 ] ].xyz, w->p[ 1 ] );
		VectorCopy( ds->verts[ ds->indexes[ i + 2 ] ].xyz, w->p[ 2 ] );
		refs += FilterWindingIntoTree_r( w, ds, tree->headnode );
	}
	
	/* use point filtering as well */
	for( i = 0; i < ds->numVerts; i++ )
		refs += FilterPointIntoTree_r( ds->verts[ i ].xyz, ds, tree->headnode );

	return refs;
}



/*
FilterFoliageIntoTree()
filters a foliage surface (wolf et/splash damage)
*/

static int FilterFoliageIntoTree( mapDrawSurface_t *ds, tree_t *tree )
{
	int				f, i, refs;
	bspDrawVert_t	*instance;
	vec3_t			xyz;
	winding_t		*w;
	
	
	/* walk origin list */
	refs = 0;
	for( f = 0; f < ds->numFoliageInstances; f++ )
	{
		/* get instance */
		instance = ds->verts + ds->patchHeight + f;
		
		/* walk triangle list */
		for( i = 0; i < ds->numIndexes; i += 3 )
		{
			/* error check */
			if( ds->indexes[ i ] >= ds->numVerts ||
				ds->indexes[ i + 1 ] >= ds->numVerts ||
				ds->indexes[ i + 2 ] >= ds->numVerts )
				Error( "Index %d greater than vertex count %d", ds->indexes[ i ], ds->numVerts );
			
			/* make a triangle winding and filter it into the tree */
			w = AllocWinding( 3 );
			w->numpoints = 3;
			VectorAdd( instance->xyz, ds->verts[ ds->indexes[ i ] ].xyz, w->p[ 0 ] );
			VectorAdd( instance->xyz, ds->verts[ ds->indexes[ i + 1 ] ].xyz, w->p[ 1 ] );
			VectorAdd( instance->xyz, ds->verts[ ds->indexes[ i + 2 ] ].xyz, w->p[ 2 ] );
			refs += FilterWindingIntoTree_r( w, ds, tree->headnode );
		}
		
		/* use point filtering as well */
		for( i = 0; i < (ds->numVerts - ds->numFoliageInstances); i++ )
		{
			VectorAdd( instance->xyz, ds->verts[ i ].xyz, xyz );
			refs += FilterPointIntoTree_r( xyz, ds, tree->headnode );
		}
	}
	
	return refs;
}



/*
FilterFlareIntoTree()
simple point filtering for flare surfaces
*/
static int FilterFlareSurfIntoTree( mapDrawSurface_t *ds, tree_t *tree )
{
	return FilterPointIntoTree_r( ds->lightmapOrigin, ds, tree->headnode );
}



/*
EmitDrawVerts() - ydnar
emits bsp drawverts from a map drawsurface
*/

void EmitDrawVerts( mapDrawSurface_t *ds, bspDrawSurface_t *out )
{
	int				i, k;
	bspDrawVert_t	*dv;
	shaderInfo_t	*si;
	float			offset;
	
	
	/* get stuff */
	si = ds->shaderInfo;
	offset = si->offset;
	
	/* copy the verts */
	out->firstVert = numBSPDrawVerts;
	out->numVerts = ds->numVerts;
	for( i = 0; i < ds->numVerts; i++ )
	{
		/* allocate a new vert */
		if( numBSPDrawVerts == MAX_MAP_DRAW_VERTS )
			Error( "MAX_MAP_DRAW_VERTS" );
		IncDrawVerts();
		dv = &bspDrawVerts[ numBSPDrawVerts - 1 ];
		
		/* copy it */
		memcpy( dv, &ds->verts[ i ], sizeof( *dv ) );
		
		/* offset? */
		if( offset != 0.0f )
			VectorMA( dv->xyz, offset, dv->normal, dv->xyz );
		
		/* expand model bounds
		   necessary because of misc_model surfaces on entities
		   note: does not happen on worldspawn as its bounds is only used for determining lightgrid bounds */
		if( numBSPModels > 0 )
			AddPointToBounds( dv->xyz, bspModels[ numBSPModels ].mins, bspModels[ numBSPModels ].maxs );
		
		/* debug color? */
		if( debugSurfaces )
		{
			for( k = 0; k < MAX_LIGHTMAPS; k++ )
				VectorCopy( debugColors[ (ds - mapDrawSurfs) % 12 ], dv->color[ k ] );
		}
	}
}



/*
FindDrawIndexes() - ydnar
this attempts to find a run of indexes in the bsp that match the given indexes
this tends to reduce the size of the bsp index pool by 1/3 or more
returns numIndexes + 1 if the search failed
*/

int FindDrawIndexes( int numIndexes, int *indexes )
{
	int		i, j, numTestIndexes;
	
	
	/* dummy check */
	if( numIndexes < 3 || numBSPDrawIndexes < numIndexes || indexes == NULL )
		return numBSPDrawIndexes;
	
	/* set limit */
	numTestIndexes = 1 + numBSPDrawIndexes - numIndexes;
	
	/* handle 3 indexes as a special case for performance */
	if( numIndexes == 3 )
	{
		/* run through all indexes */
		for( i = 0; i < numTestIndexes; i++ )
		{
			/* test 3 indexes */
			if( indexes[ 0 ] == bspDrawIndexes[ i ] &&
				indexes[ 1 ] == bspDrawIndexes[ i + 1 ] &&
				indexes[ 2 ] == bspDrawIndexes[ i + 2 ] )
			{
				numRedundantIndexes += numIndexes;
				return i;
			}
		}
		
		/* failed */
		return numBSPDrawIndexes;
	}
	
	/* handle 4 or more indexes */
	for( i = 0; i < numTestIndexes; i++ )
	{
		/* test first 4 indexes */
		if( indexes[ 0 ] == bspDrawIndexes[ i ] &&
			indexes[ 1 ] == bspDrawIndexes[ i + 1 ] &&
			indexes[ 2 ] == bspDrawIndexes[ i + 2 ] &&
			indexes[ 3 ] == bspDrawIndexes[ i + 3 ] )
		{
			/* handle 4 indexes */
			if( numIndexes == 4 )
				return i;
			
			/* test the remainder */
			for( j = 4; j < numIndexes; j++ )
			{
				if( indexes[ j ] != bspDrawIndexes[ i + j ] )
					break;
				else if( j == (numIndexes - 1) )
				{
					numRedundantIndexes += numIndexes;
					return i;
				}
			}
		}
	}
	
	/* failed */
	return numBSPDrawIndexes;
}



/*
EmitDrawIndexes() - ydnar
attempts to find an existing run of drawindexes before adding new ones
*/

void EmitDrawIndexes( mapDrawSurface_t *ds, bspDrawSurface_t *out )
{
	int			i;
	
	
	/* attempt to use redundant indexing */
	out->firstIndex = FindDrawIndexes( ds->numIndexes, ds->indexes );
	out->numIndexes = ds->numIndexes;
	if( out->firstIndex == numBSPDrawIndexes )
	{
		/* copy new unique indexes */
		for( i = 0; i < ds->numIndexes; i++ )
		{
			if( numBSPDrawIndexes == MAX_MAP_DRAW_INDEXES )
				Error( "MAX_MAP_DRAW_INDEXES" );
			bspDrawIndexes[ numBSPDrawIndexes ] = ds->indexes[ i ];

			/* validate the index */
			if( ds->type != SURFACE_PATCH )
			{
				if( bspDrawIndexes[ numBSPDrawIndexes ] < 0 || bspDrawIndexes[ numBSPDrawIndexes ] >= ds->numVerts )
				{
					Sys_Printf( "WARNING: %d %s has invalid index %d (%d)\n",
						numBSPDrawSurfaces,
						ds->shaderInfo->shader,
						bspDrawIndexes[ numBSPDrawIndexes ],
						i );
					bspDrawIndexes[ numBSPDrawIndexes ] = 0;
				}
			}
			
			/* increment index count */
			numBSPDrawIndexes++;
		}
	}
}




/*
EmitFlareSurface()
emits a bsp flare drawsurface
*/

void EmitFlareSurface( mapDrawSurface_t *ds )
{
	int						i;
	bspDrawSurface_t		*out;
	
	
	/* ydnar: nuking useless flare drawsurfaces */
	if( emitFlares == qfalse && ds->type != SURFACE_SHADER )
		return;
	
	/* limit check */
	if( numBSPDrawSurfaces == MAX_MAP_DRAW_SURFS )
		Error( "MAX_MAP_DRAW_SURFS" );
	
	/* allocate a new surface */
	if( numBSPDrawSurfaces == MAX_MAP_DRAW_SURFS )
		Error( "MAX_MAP_DRAW_SURFS" );
	out = &bspDrawSurfaces[ numBSPDrawSurfaces ];
	ds->outputNum = numBSPDrawSurfaces;
	numBSPDrawSurfaces++;
	memset( out, 0, sizeof( *out ) );
	
	/* set it up */
	out->surfaceType = MST_FLARE;
	out->shaderNum = EmitShader( ds->shaderInfo->shader, &ds->shaderInfo->contentFlags, &ds->shaderInfo->surfaceFlags );
	out->fogNum = ds->fogNum;
	
	/* RBSP */
	for( i = 0; i < MAX_LIGHTMAPS; i++ )
	{
		out->lightmapNum[ i ] = -3;
		out->lightmapStyles[ i ] = LS_NONE;
		out->vertexStyles[ i ] = LS_NONE;
	}
	out->lightmapStyles[ 0 ] = ds->lightStyle;
	out->vertexStyles[ 0 ] = ds->lightStyle;
	
	VectorCopy( ds->lightmapOrigin, out->lightmapOrigin );			/* origin */
	VectorCopy( ds->lightmapVecs[ 0 ], out->lightmapVecs[ 0 ] );	/* color */
	VectorCopy( ds->lightmapVecs[ 1 ], out->lightmapVecs[ 1 ] );
	VectorCopy( ds->lightmapVecs[ 2 ], out->lightmapVecs[ 2 ] );	/* normal */
	
	/* add to count */
	numSurfacesByType[ ds->type ]++;
}



/*
EmitPatchSurface()
emits a bsp patch drawsurface
*/

void EmitPatchSurface( mapDrawSurface_t *ds )
{
	int					i, j;
	bspDrawSurface_t	*out;
	int					surfaceFlags, contentFlags;
	
	
	/* invert the surface if necessary */
	if( ds->backSide || ds->shaderInfo->invert )
	{
		bspDrawVert_t	*dv1, *dv2, temp;
		

		/* walk the verts, flip the normal */
		for( i = 0; i < ds->numVerts; i++ )
			VectorScale( ds->verts[ i ].normal, -1.0f, ds->verts[ i ].normal );
		
		/* walk the verts again, but this time reverse their order */
		for( j = 0; j < ds->patchHeight; j++ )
		{
			for( i = 0; i < (ds->patchWidth / 2); i++ )
			{
				dv1 = &ds->verts[ j * ds->patchWidth + i ];
				dv2 = &ds->verts[ j * ds->patchWidth + (ds->patchWidth - i - 1) ];
				memcpy( &temp, dv1, sizeof( bspDrawVert_t ) );
				memcpy( dv1, dv2, sizeof( bspDrawVert_t ) );
				memcpy( dv2, &temp, sizeof( bspDrawVert_t ) );
			}
		}
		
		/* invert facing */
		VectorScale( ds->lightmapVecs[ 2 ], -1.0f, ds->lightmapVecs[ 2 ] );
	}
	
	/* allocate a new surface */
	if( numBSPDrawSurfaces == MAX_MAP_DRAW_SURFS )
		Error( "MAX_MAP_DRAW_SURFS" );
	out = &bspDrawSurfaces[ numBSPDrawSurfaces ];
	ds->outputNum = numBSPDrawSurfaces;
	numBSPDrawSurfaces++;
	memset( out, 0, sizeof( *out ) );
	
	/* set it up */
	out->surfaceType = MST_PATCH;
	if( debugSurfaces )
		out->shaderNum = EmitShader( "debugsurfaces", NULL, NULL );
	else if( patchMeta )
	{
		/* patch meta requires that we have nodraw patches for collision */
		surfaceFlags = ds->shaderInfo->surfaceFlags;
		contentFlags = ds->shaderInfo->contentFlags;
		ApplySurfaceParm( "nodraw", &contentFlags, &surfaceFlags, NULL );
		ApplySurfaceParm( "pointlight", &contentFlags, &surfaceFlags, NULL );
		
		/* we don't want this patch getting lightmapped */
		VectorClear( ds->lightmapVecs[ 2 ] );
		VectorClear( ds->lightmapAxis );
		ds->sampleSize = 0;

		/* emit the new fake shader */
		out->shaderNum = EmitShader( ds->shaderInfo->shader, &contentFlags, &surfaceFlags );
	}
	else
		out->shaderNum = EmitShader( ds->shaderInfo->shader, &ds->shaderInfo->contentFlags, &ds->shaderInfo->surfaceFlags );
	out->patchWidth = ds->patchWidth;
	out->patchHeight = ds->patchHeight;
	out->fogNum = ds->fogNum;
	
	/* RBSP */
	for( i = 0; i < MAX_LIGHTMAPS; i++ )
	{
		out->lightmapNum[ i ] = -3;
		out->lightmapStyles[ i ] = LS_NONE;
		out->vertexStyles[ i ] = LS_NONE;
	}
	out->lightmapStyles[ 0 ] = LS_NORMAL;
	out->vertexStyles[ 0 ] = LS_NORMAL;
	
	/* ydnar: gs mods: previously, the lod bounds were stored in lightmapVecs[ 0 ] and [ 1 ], moved to bounds[ 0 ] and [ 1 ] */
	VectorCopy( ds->lightmapOrigin, out->lightmapOrigin );
	VectorCopy( ds->bounds[ 0 ], out->lightmapVecs[ 0 ] );
	VectorCopy( ds->bounds[ 1 ], out->lightmapVecs[ 1 ] );
	VectorCopy( ds->lightmapVecs[ 2 ], out->lightmapVecs[ 2 ] );
	
	/* ydnar: gs mods: clear out the plane normal */
	if( ds->planar == qfalse )
		VectorClear( out->lightmapVecs[ 2 ] );
	
	/* emit the verts and indexes */
	EmitDrawVerts( ds, out );
	EmitDrawIndexes( ds, out );
	
	/* add to count */
	numSurfacesByType[ ds->type ]++;
}



/*
OptimizeTriangleSurface() - ydnar
optimizes the vertex/index data in a triangle surface
*/

#define VERTEX_CACHE_SIZE	16

static void OptimizeTriangleSurface( mapDrawSurface_t *ds )
{
	int		i, j, k, temp, first, best, bestScore, score;
	int		vertexCache[ VERTEX_CACHE_SIZE + 1 ];	/* one more for optimizing insert */
	int		*indexes;
	
	
	/* certain surfaces don't get optimized */
	if( ds->numIndexes <= VERTEX_CACHE_SIZE ||
		ds->shaderInfo->autosprite )
		return;
	
	/* create index scratch pad */
	indexes = safe_malloc( ds->numIndexes * sizeof( *indexes ) );
	memcpy( indexes, ds->indexes, ds->numIndexes * sizeof( *indexes ) );
	
	/* setup */
	for( i = 0; i <= VERTEX_CACHE_SIZE && i < ds->numIndexes; i++ )
		vertexCache[ i ] = indexes[ i ];
	
	/* add triangles in a vertex cache-aware order */
	for( i = 0; i < ds->numIndexes; i += 3 )
	{
		/* find best triangle given the current vertex cache */
		first = -1;
		best = -1;
		bestScore = -1;
		for( j = 0; j < ds->numIndexes; j += 3 )
		{
			/* valid triangle? */
			if( indexes[ j ] != -1 )
			{
				/* set first if necessary */
				if( first < 0 )
					first = j;
				
				/* score the triangle */
				score = 0;
				for( k = 0; k < VERTEX_CACHE_SIZE; k++ )
				{
					if( indexes[ j ] == vertexCache[ k ] || indexes[ j + 1 ] == vertexCache[ k ] || indexes[ j + 2 ] == vertexCache[ k ] )
						score++;
				}
				
				/* better triangle? */
				if( score > bestScore )
				{
					bestScore = score;
					best = j;
				}
				
				/* a perfect score of 3 means this triangle's verts are already present in the vertex cache */
				if( score == 3 )
					break;
			}
		}
		
		/* check if no decent triangle was found, and use first available */
		if( best < 0 )
			best = first;
		
		/* valid triangle? */
		if( best >= 0 )
		{
			/* add triangle to vertex cache */
			for( j = 0; j < 3; j++ )
			{
				for( k = 0; k < VERTEX_CACHE_SIZE; k++ )
				{
					if( indexes[ best + j ] == vertexCache[ k ] )
						break;
				}
				
				if( k >= VERTEX_CACHE_SIZE )
				{
					/* pop off top of vertex cache */
					for( k = VERTEX_CACHE_SIZE; k > 0; k-- )
						vertexCache[ k ] = vertexCache[ k - 1 ];
					
					/* add vertex */
					vertexCache[ 0 ] = indexes[ best + j ];
				}
			}
			
			/* add triangle to surface */
			ds->indexes[ i ] = indexes[ best ];
			ds->indexes[ i + 1 ] = indexes[ best + 1 ];
			ds->indexes[ i + 2 ] = indexes[ best + 2 ];
			
			/* clear from input pool */
			indexes[ best ] = -1;
			indexes[ best + 1 ] = -1;
			indexes[ best + 2 ] = -1;
			
			/* sort triangle windings (312 -> 123) */
			while( ds->indexes[ i ] > ds->indexes[ i + 1 ] || ds->indexes[ i ] > ds->indexes[ i + 2 ] )
			{
				temp = ds->indexes[ i ];
				ds->indexes[ i ] = ds->indexes[ i + 1 ];
				ds->indexes[ i + 1 ] = ds->indexes[ i + 2 ];
				ds->indexes[ i + 2 ] = temp;
			}
		}
	}
	
	/* clean up */
	free( indexes );
}



/*
EmitTriangleSurface()
creates a bsp drawsurface from arbitrary triangle surfaces
*/

static void EmitTriangleSurface( mapDrawSurface_t *ds )
{
	int						i, temp;
	bspDrawSurface_t		*out;
	
	
	/* invert the surface if necessary */
	if( ds->backSide || ds->shaderInfo->invert )
	{
		/* walk the indexes, reverse the triangle order */
		for( i = 0; i < ds->numIndexes; i += 3 )
		{
			temp = ds->indexes[ i ];
			ds->indexes[ i ] = ds->indexes[ i + 1 ];
			ds->indexes[ i + 1 ] = temp;
		}
		
		/* walk the verts, flip the normal */
		for( i = 0; i < ds->numVerts; i++ )
			VectorScale( ds->verts[ i ].normal, -1.0f, ds->verts[ i ].normal );
		
		/* invert facing */
		VectorScale( ds->lightmapVecs[ 2 ], -1.0f, ds->lightmapVecs[ 2 ] );
	}
	
	/* allocate a new surface */
	if( numBSPDrawSurfaces == MAX_MAP_DRAW_SURFS )
		Error( "MAX_MAP_DRAW_SURFS" );
	out = &bspDrawSurfaces[ numBSPDrawSurfaces ];
	ds->outputNum = numBSPDrawSurfaces;
	numBSPDrawSurfaces++;
	memset( out, 0, sizeof( *out ) );
	
	/* ydnar/sd: handle wolf et foliage surfaces */
	if( ds->type == SURFACE_FOLIAGE )
		out->surfaceType = MST_FOLIAGE;
	
	/* ydnar: gs mods: handle lightmapped terrain (force to planar type) */
	//%	else if( VectorLength( ds->lightmapAxis ) <= 0.0f || ds->type == SURFACE_TRIANGLES || ds->type == SURFACE_FOGHULL || debugSurfaces )
	else if( (VectorLength( ds->lightmapAxis ) <= 0.0f && ds->planar == qfalse) ||
		ds->type == SURFACE_TRIANGLES ||
		ds->type == SURFACE_FOGHULL ||
		ds->numVerts > maxLMSurfaceVerts ||
		debugSurfaces )
		out->surfaceType = MST_TRIANGLE_SOUP;
	
	/* set to a planar face */
	else
		out->surfaceType = MST_PLANAR;
	
	/* set it up */
	if( debugSurfaces )
		out->shaderNum = EmitShader( "debugsurfaces", NULL, NULL );
	else
		out->shaderNum = EmitShader( ds->shaderInfo->shader, &ds->shaderInfo->contentFlags, &ds->shaderInfo->surfaceFlags );
	out->patchWidth = ds->patchWidth;
	out->patchHeight = ds->patchHeight;
	out->fogNum = ds->fogNum;
	
	/* debug inset (push each triangle vertex towards the center of each triangle it is on */
	if( debugInset )
	{
		bspDrawVert_t	*a, *b, *c;
		vec3_t			cent, dir;

		
		/* walk triangle list */
		for( i = 0; i < ds->numIndexes; i += 3 )
		{
			/* get verts */
			a = &ds->verts[ ds->indexes[ i ] ];
			b = &ds->verts[ ds->indexes[ i + 1 ] ];
			c = &ds->verts[ ds->indexes[ i + 2 ] ];
			
			/* calculate centroid */
			VectorCopy( a->xyz, cent );
			VectorAdd( cent, b->xyz, cent );
			VectorAdd( cent, c->xyz, cent );
			VectorScale( cent, 1.0f / 3.0f, cent );
			
			/* offset each vertex */
			VectorSubtract( cent, a->xyz, dir );
			VectorNormalize( dir, dir );
			VectorAdd( a->xyz, dir, a->xyz );
			VectorSubtract( cent, b->xyz, dir );
			VectorNormalize( dir, dir );
			VectorAdd( b->xyz, dir, b->xyz );
			VectorSubtract( cent, c->xyz, dir );
			VectorNormalize( dir, dir );
			VectorAdd( c->xyz, dir, c->xyz );
		}
	}
	
	/* RBSP */
	for( i = 0; i < MAX_LIGHTMAPS; i++ )
	{
		out->lightmapNum[ i ] = -3;
		out->lightmapStyles[ i ] = LS_NONE;
		out->vertexStyles[ i ] = LS_NONE;
	}
	out->lightmapStyles[ 0 ] = LS_NORMAL;
	out->vertexStyles[ 0 ] = LS_NORMAL;
	
	/* lightmap vectors (lod bounds for patches */
	VectorCopy( ds->lightmapOrigin, out->lightmapOrigin );
	VectorCopy( ds->lightmapVecs[ 0 ], out->lightmapVecs[ 0 ] );
	VectorCopy( ds->lightmapVecs[ 1 ], out->lightmapVecs[ 1 ] );
	VectorCopy( ds->lightmapVecs[ 2 ], out->lightmapVecs[ 2 ] );
	
	/* ydnar: gs mods: clear out the plane normal */
	if( ds->planar == qfalse )
		VectorClear( out->lightmapVecs[ 2 ] );
	
	/* optimize the surface's triangles */
	OptimizeTriangleSurface( ds );
	
	/* emit the verts and indexes */
	EmitDrawVerts( ds, out );
	EmitDrawIndexes( ds, out );
	
	/* add to count */
	numSurfacesByType[ ds->type ]++;
}



/*
EmitFaceSurface()
emits a bsp planar winding (brush face) drawsurface
*/

static void EmitFaceSurface( mapDrawSurface_t *ds )
{
	/* strip/fan finding was moved elsewhere */
	StripFaceSurface( ds );
	EmitTriangleSurface( ds );
}



/*
MakeDebugPortalSurfs_r() - ydnar
generates drawsurfaces for passable portals in the bsp
*/

static void MakeDebugPortalSurfs_r( node_t *node, shaderInfo_t *si )
{
	int					i, k, c, s;	
	portal_t			*p;
	winding_t			*w;
	mapDrawSurface_t	*ds;
	bspDrawVert_t		*dv;
	
	
	/* recurse if decision node */
	if( node->planenum != PLANENUM_LEAF)
	{
		MakeDebugPortalSurfs_r( node->children[ 0 ], si );
		MakeDebugPortalSurfs_r( node->children[ 1 ], si );
		return;
	}
	
	/* don't bother with opaque leaves */
	if( node->opaque )
		return;
	
	/* walk the list of portals */
	for( c = 0, p = node->portals; p != NULL; c++, p = p->next[ s ] )
	{
		/* get winding and side even/odd */
		w = p->winding;
		s = (p->nodes[ 1 ] == node);
		
		/* is this a valid portal for this leaf? */
		if( w && p->nodes[ 0 ] == node )
		{
			/* is this portal passable? */
			if( PortalPassable( p ) == qfalse )
				continue;
			
			/* check max points */
			if( w->numpoints > 64 )
				Error( "MakePortalSurfs_r: w->numpoints = %d", w->numpoints );
			
			/* allocate a drawsurface */
			ds = AllocDrawSurface( SURFACE_FACE );
			ds->shaderInfo = si;
			ds->planar = qtrue;
			ds->sideRef = AllocSideRef( p->side, NULL );
			ds->planeNum = FindFloatPlane( p->plane.normal, p->plane.dist, 0, NULL );
			VectorCopy( p->plane.normal, ds->lightmapVecs[ 2 ] );
			ds->fogNum = -1;
			ds->numVerts = w->numpoints;
			ds->verts = safe_malloc( ds->numVerts * sizeof( *ds->verts ) );
			memset( ds->verts, 0, ds->numVerts * sizeof( *ds->verts ) );
			
			/* walk the winding */
			for( i = 0; i < ds->numVerts; i++ )
			{
				/* get vert */
				dv = ds->verts + i;
				
				/* set it */
				VectorCopy( w->p[ i ], dv->xyz );
				VectorCopy( p->plane.normal, dv->normal );
				dv->st[ 0 ] = 0;
				dv->st[ 1 ] = 0;
				for( k = 0; k < MAX_LIGHTMAPS; k++ )
				{
					VectorCopy( debugColors[ c % 12 ], dv->color[ k ] );
					dv->color[ k ][ 3 ] = 32;
				}
			}
		}
	}
}



/*
MakeDebugPortalSurfs() - ydnar
generates drawsurfaces for passable portals in the bsp
*/

void MakeDebugPortalSurfs( tree_t *tree )
{
	shaderInfo_t	*si;
	
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- MakeDebugPortalSurfs ---\n" );
	
	/* get portal debug shader */
	si = ShaderInfoForShader( "debugportals" );
	
	/* walk the tree */
	MakeDebugPortalSurfs_r( tree->headnode, si );
}



/*
MakeFogHullSurfs()
generates drawsurfaces for a foghull (this MUST use a sky shader)
*/

void MakeFogHullSurfs( entity_t *e, tree_t *tree, char *shader )
{
	shaderInfo_t		*si;
	mapDrawSurface_t	*ds;
	vec3_t				fogMins, fogMaxs;
	int					i, indexes[] =
						{
							0, 1, 2, 0, 2, 3,
							4, 7, 5, 5, 7, 6,
							1, 5, 6, 1, 6, 2,
							0, 4, 5, 0, 5, 1,
							2, 6, 7, 2, 7, 3,
							3, 7, 4, 3, 4, 0
						};

	
	/* dummy check */
	if( shader == NULL || shader[ 0 ] == '\0' )
		return;
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- MakeFogHullSurfs ---\n" );
	
	/* get hull bounds */
	VectorCopy( mapMins, fogMins );
	VectorCopy( mapMaxs, fogMaxs );
	for( i = 0; i < 3; i++ )
	{
		fogMins[ i ] -= 128;
		fogMaxs[ i ] += 128;
	}
	
	/* get foghull shader */
	si = ShaderInfoForShader( shader );
	
	/* allocate a drawsurface */
	ds = AllocDrawSurface( SURFACE_FOGHULL );
	ds->shaderInfo = si;
	ds->fogNum = -1;
	ds->numVerts = 8;
	ds->verts = safe_malloc( ds->numVerts * sizeof( *ds->verts ) );
	memset( ds->verts, 0, ds->numVerts * sizeof( *ds->verts ) );
	ds->numIndexes = 36;
	ds->indexes = safe_malloc( ds->numIndexes * sizeof( *ds->indexes ) );
	memset( ds->indexes, 0, ds->numIndexes * sizeof( *ds->indexes ) );
	
	/* set verts */
	VectorSet( ds->verts[ 0 ].xyz, fogMins[ 0 ], fogMins[ 1 ], fogMins[ 2 ] );
	VectorSet( ds->verts[ 1 ].xyz, fogMins[ 0 ], fogMaxs[ 1 ], fogMins[ 2 ] );
	VectorSet( ds->verts[ 2 ].xyz, fogMaxs[ 0 ], fogMaxs[ 1 ], fogMins[ 2 ] );
	VectorSet( ds->verts[ 3 ].xyz, fogMaxs[ 0 ], fogMins[ 1 ], fogMins[ 2 ] );
	
	VectorSet( ds->verts[ 4 ].xyz, fogMins[ 0 ], fogMins[ 1 ], fogMaxs[ 2 ] );
	VectorSet( ds->verts[ 5 ].xyz, fogMins[ 0 ], fogMaxs[ 1 ], fogMaxs[ 2 ] );
	VectorSet( ds->verts[ 6 ].xyz, fogMaxs[ 0 ], fogMaxs[ 1 ], fogMaxs[ 2 ] );
	VectorSet( ds->verts[ 7 ].xyz, fogMaxs[ 0 ], fogMins[ 1 ], fogMaxs[ 2 ] );
	
	/* set indexes */
	memcpy( ds->indexes, indexes, ds->numIndexes * sizeof( *ds->indexes ) );
}



/*
BiasSurfaceTextures()
biases a surface's texcoords as close to 0 as possible
*/

void BiasSurfaceTextures( mapDrawSurface_t *ds )
{
	int		i;
	
	
	/* calculate the surface texture bias */
	CalcSurfaceTextureRange( ds );
	
	/* don't bias globaltextured shaders */
	if( ds->shaderInfo->globalTexture )
		return;
	
	/* bias the texture coordinates */
	for( i = 0; i < ds->numVerts; i++ )
	{
		ds->verts[ i ].st[ 0 ] += ds->bias[ 0 ];
		ds->verts[ i ].st[ 1 ] += ds->bias[ 1 ];
	}
}



/*
AddSurfaceModelsToTriangle_r()
adds models to a specified triangle, returns the number of models added
*/

int AddSurfaceModelsToTriangle_r( mapDrawSurface_t *ds, surfaceModel_t *model, bspDrawVert_t **tri )
{
	bspDrawVert_t	mid, *tri2[ 3 ];
	int				max, n, localNumSurfaceModels;
	
	
	/* init */
	localNumSurfaceModels = 0;
	
	/* subdivide calc */
	{
		int			i;
		float		*a, *b, dx, dy, dz, dist, maxDist;
		
		
		/* find the longest edge and split it */
		max = -1;
		maxDist = 0.0f;
		for( i = 0; i < 3; i++ )
		{
			/* get verts */
			a = tri[ i ]->xyz;
			b = tri[ (i + 1) % 3 ]->xyz;
			
			/* get dists */
			dx = a[ 0 ] - b[ 0 ];
			dy = a[ 1 ] - b[ 1 ];
			dz = a[ 2 ] - b[ 2 ];
			dist = (dx * dx) + (dy * dy) + (dz * dz);
			
			/* longer? */
			if( dist > maxDist )
			{
				maxDist = dist;
				max = i;
			}
		}
		
		/* is the triangle small enough? */
		if( max < 0 || maxDist <= (model->density * model->density) )
		{
			float	odds, r, angle;
			vec3_t	origin, normal, scale, axis[ 3 ], angles;
			m4x4_t	transform, temp;

			
			/* roll the dice (model's odds scaled by vertex alpha) */
			odds = model->odds * (tri[ 0 ]->color[ 0 ][ 3 ] + tri[ 0 ]->color[ 0 ][ 3 ] + tri[ 0 ]->color[ 0 ][ 3 ]) / 765.0f;
			r = Random();
			if( r > model->odds )
				return 0;
			
			/* calculate scale */
			r = model->minScale + Random() * (model->maxScale - model->minScale);
			VectorSet( scale, r, r, r );
			
			/* calculate angle */
			angle = model->minAngle + Random() * (model->maxAngle - model->minAngle);
			
			/* calculate average origin */
			VectorCopy( tri[ 0 ]->xyz, origin );
			VectorAdd( origin, tri[ 1 ]->xyz, origin );
			VectorAdd( origin, tri[ 2 ]->xyz, origin );
			VectorScale( origin, (1.0f / 3.0f), origin );
			
			/* clear transform matrix */
			m4x4_identity( transform );

			/* handle oriented models */
			if( model->oriented )
			{
				/* set angles */
				VectorSet( angles, 0.0f, 0.0f, angle );
				
				/* calculate average normal */
				VectorCopy( tri[ 0 ]->normal, normal );
				VectorAdd( normal, tri[ 1 ]->normal, normal );
				VectorAdd( normal, tri[ 2 ]->normal, normal );
				if( VectorNormalize( normal, axis[ 2 ] ) == 0.0f )
					VectorCopy( tri[ 0 ]->normal, axis[ 2 ] );
				
				/* make perpendicular vectors */
				MakeNormalVectors( axis[ 2 ], axis[ 1 ], axis[ 0 ] );
				
				/* copy to matrix */
				m4x4_identity( temp );
				temp[ 0 ] = axis[ 0 ][ 0 ];	temp[ 1 ] = axis[ 0 ][ 1 ];	temp[ 2 ] = axis[ 0 ][ 2 ];
				temp[ 4 ] = axis[ 1 ][ 0 ];	temp[ 5 ] = axis[ 1 ][ 1 ];	temp[ 6 ] = axis[ 1 ][ 2 ];
				temp[ 8 ] = axis[ 2 ][ 0 ];	temp[ 9 ] = axis[ 2 ][ 1 ];	temp[ 10 ] = axis[ 2 ][ 2 ];
				
				/* scale */
				m4x4_scale_by_vec3( temp, scale );
				
				/* rotate around z axis */
				m4x4_rotate_by_vec3( temp, angles, eXYZ );
				
				/* translate */
				m4x4_translate_by_vec3( transform, origin );
				
				/* tranform into axis space */
				m4x4_multiply_by_m4x4( transform, temp );
			}
			
			/* handle z-up models */
			else
			{
				/* set angles */
				VectorSet( angles, 0.0f, 0.0f, angle );
				
				/* set matrix */
				m4x4_pivoted_transform_by_vec3( transform, origin, angles, eXYZ, scale, vec3_origin );
			}
			
			/* insert the model */
			InsertModel( (char *) model->model, 0, transform, NULL, ds->celShader, ds->entityNum, ds->castShadows, ds->recvShadows, 0, ds->lightmapScale );
			
			/* return to sender */
			return 1;
		}
	}
	
	/* split the longest edge and map it */
	LerpDrawVert( tri[ max ], tri[ (max + 1) % 3 ], &mid );
	
	/* recurse to first triangle */
	VectorCopy( tri, tri2 );
	tri2[ max ] = &mid;
	n = AddSurfaceModelsToTriangle_r( ds, model, tri2 );
	if( n < 0 )
		return n;
	localNumSurfaceModels += n;
	
	/* recurse to second triangle */
	VectorCopy( tri, tri2 );
	tri2[ (max + 1) % 3 ] = &mid;
	n = AddSurfaceModelsToTriangle_r( ds, model, tri2 );
	if( n < 0 )
		return n;
	localNumSurfaceModels += n;
	
	/* return count */
	return localNumSurfaceModels;
}



/*
AddSurfaceModels()
adds a surface's shader models to the surface
*/

int AddSurfaceModels( mapDrawSurface_t *ds )
{
	surfaceModel_t	*model;
	int				i, x, y, n, pw[ 5 ], r, localNumSurfaceModels, iterations;
	mesh_t			src, *mesh, *subdivided;
	bspDrawVert_t	centroid, *tri[ 3 ];
	float			alpha;
	
	
	/* dummy check */
	if( ds == NULL || ds->shaderInfo == NULL || ds->shaderInfo->surfaceModel == NULL )
		return 0;
	
	/* init */
	localNumSurfaceModels = 0;
	
	/* walk the model list */
	for( model = ds->shaderInfo->surfaceModel; model != NULL; model = model->next )
	{
		/* switch on type */
		switch( ds->type )
		{
			/* handle brush faces and decals */
			case SURFACE_FACE:
			case SURFACE_DECAL:
				/* calculate centroid */
				memset( &centroid, 0, sizeof( centroid ) );
				alpha = 0.0f;
				
				/* walk verts */
				for( i = 0; i < ds->numVerts; i++ )
				{
					VectorAdd( centroid.xyz, ds->verts[ i ].xyz, centroid.xyz );
					VectorAdd( centroid.normal, ds->verts[ i ].normal, centroid.normal );
					centroid.st[ 0 ] += ds->verts[ i ].st[ 0 ];
					centroid.st[ 1 ] += ds->verts[ i ].st[ 1 ];
					alpha += ds->verts[ i ].color[ 0 ][ 3 ];
				}
				
				/* average */
				centroid.xyz[ 0 ] /= ds->numVerts;
				centroid.xyz[ 1 ] /= ds->numVerts;
				centroid.xyz[ 2 ] /= ds->numVerts;
				if( VectorNormalize( centroid.normal, centroid.normal ) == 0.0f )
					VectorCopy( ds->verts[ 0 ].normal, centroid.normal );
				centroid.st[ 0 ]  /= ds->numVerts;
				centroid.st[ 1 ]  /= ds->numVerts;
				alpha /= ds->numVerts;
				centroid.color[ 0 ][ 0 ] = 0xFF;
				centroid.color[ 0 ][ 1 ] = 0xFF;
				centroid.color[ 0 ][ 2 ] = 0xFF;
				centroid.color[ 0 ][ 2 ] = (alpha > 255.0f ? 0xFF : alpha);
				
				/* head vert is centroid */
				tri[ 0 ] = &centroid;
				
				/* walk fanned triangles */
				for( i = 0; i < ds->numVerts; i++ )
				{
					/* set triangle */
					tri[ 1 ] = &ds->verts[ i ];
					tri[ 2 ] = &ds->verts[ (i + 1) % ds->numVerts ];
					
					/* create models */
					n = AddSurfaceModelsToTriangle_r( ds, model, tri );
					if( n < 0 )
						return n;
					localNumSurfaceModels += n;
				}
				break;
			
			/* handle patches */
			case SURFACE_PATCH:
				/* subdivide the surface */
				src.width = ds->patchWidth;
				src.height = ds->patchHeight;
				src.verts = ds->verts;
				//%	subdivided = SubdivideMesh( src, 8.0f, 512 );
				iterations = IterationsForCurve( ds->longestCurve, patchSubdivisions );
				subdivided = SubdivideMesh2( src, iterations );
				
				/* fit it to the curve and remove colinear verts on rows/columns */
				PutMeshOnCurve( *subdivided );
				mesh = RemoveLinearMeshColumnsRows( subdivided );
				FreeMesh( subdivided );
				
				/* subdivide each quad to place the models */
				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;
						
						/* triangle 1 */
						tri[ 0 ] = &mesh->verts[ pw[ r + 0 ] ];
						tri[ 1 ] = &mesh->verts[ pw[ r + 1 ] ];
						tri[ 2 ] = &mesh->verts[ pw[ r + 2 ] ];
						n = AddSurfaceModelsToTriangle_r( ds, model, tri );
						if( n < 0 )
							return n;
						localNumSurfaceModels += n;
						
						/* triangle 2 */
						tri[ 0 ] = &mesh->verts[ pw[ r + 0 ] ];
						tri[ 1 ] = &mesh->verts[ pw[ r + 2 ] ];
						tri[ 2 ] = &mesh->verts[ pw[ r + 3 ] ];
						n = AddSurfaceModelsToTriangle_r( ds, model, tri );
						if( n < 0 )
							return n;
						localNumSurfaceModels += n;
					}
				}
				
				/* free the subdivided mesh */
				FreeMesh( mesh );
				break;
			
			/* handle triangle surfaces */
			case SURFACE_TRIANGLES:
			case SURFACE_FORCED_META:
			case SURFACE_META:
				/* walk the triangle list */
				for( i = 0; i < ds->numIndexes; i += 3 )
				{
					tri[ 0 ] = &ds->verts[ ds->indexes[ i ] ];
					tri[ 1 ] = &ds->verts[ ds->indexes[ i + 1 ] ];
					tri[ 2 ] = &ds->verts[ ds->indexes[ i + 2 ] ];
					n = AddSurfaceModelsToTriangle_r( ds, model, tri );
					if( n < 0 )
						return n;
					localNumSurfaceModels += n;
				}
				break;
			
			/* no support for flares, foghull, etc */
			default:
				break;
		}
	}
	
	/* return count */
	return localNumSurfaceModels;
}



/*
AddEntitySurfaceModels() - ydnar
adds surfacemodels to an entity's surfaces
*/

void AddEntitySurfaceModels( entity_t *e )
{
	int		i;
	
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- AddEntitySurfaceModels ---\n" );
	
	/* walk the surface list */
	for( i = e->firstDrawSurf; i < numMapDrawSurfs; i++ )
		numSurfaceModels += AddSurfaceModels( &mapDrawSurfs[ i ] );
}



/*
VolumeColorMods() - ydnar
applies brush/volumetric color/alpha modulation to vertexes
*/

static void VolumeColorMods( entity_t *e, mapDrawSurface_t *ds )
{
	int			i, j;
	float		d;
	brush_t		*b;
	plane_t		*plane;
	
	
	/* early out */
	if( e->colorModBrushes == NULL )
		return;
	
	/* iterate brushes */
	for( b = e->colorModBrushes; b != NULL; b = b->nextColorModBrush )
	{
		/* worldspawn alpha brushes affect all, grouped ones only affect original entity */
		if( b->entityNum != 0 && b->entityNum != ds->entityNum )
			continue;
		
		/* test bbox */
		if( b->mins[ 0 ] > ds->maxs[ 0 ] || b->maxs[ 0 ] < ds->mins[ 0 ] ||
			b->mins[ 1 ] > ds->maxs[ 1 ] || b->maxs[ 1 ] < ds->mins[ 1 ] ||
			b->mins[ 2 ] > ds->maxs[ 2 ] || b->maxs[ 2 ] < ds->mins[ 2 ] )
			continue;
		
		/* iterate verts */
		for( i = 0; i < ds->numVerts; i++ )
		{
			/* iterate planes */
			for( j = 0; j < b->numsides; j++ )
			{
				/* point-plane test */
				plane = &mapplanes[ b->sides[ j ].planenum ];
				d = DotProduct( ds->verts[ i ].xyz, plane->normal ) - plane->dist;
				if( d > 1.0f )
					break;
			}
			
			/* apply colormods */
			if( j == b->numsides )
				ColorMod( b->contentShader->colorMod, 1, &ds->verts[ i ] );
		}
	}
}



/*
FilterDrawsurfsIntoTree()
upon completion, all drawsurfs that actually generate a reference
will have been emited to the bspfile arrays, and the references
will have valid final indexes
*/

void FilterDrawsurfsIntoTree( entity_t *e, tree_t *tree )
{
	int					i, j;
	mapDrawSurface_t	*ds;
	shaderInfo_t		*si;
	vec3_t				origin, mins, maxs;
	int					refs;
	int					numSurfs, numRefs, numSkyboxSurfaces;
	
	
	/* note it */
	Sys_FPrintf( SYS_VRB, "--- FilterDrawsurfsIntoTree ---\n" );
	
	/* filter surfaces into the tree */
	numSurfs = 0;
	numRefs = 0;
	numSkyboxSurfaces = 0;
	for( i = e->firstDrawSurf; i < numMapDrawSurfs; i++ )
	{
		/* get surface and try to early out */
		ds = &mapDrawSurfs[ i ];
		if( ds->numVerts == 0 && ds->type != SURFACE_FLARE && ds->type != SURFACE_SHADER )
			continue;
		
		/* get shader */
		si = ds->shaderInfo;
		
		/* ydnar: skybox surfaces are special */
		if( ds->skybox )
		{
			refs = AddReferenceToTree_r( ds, tree->headnode, qtrue );
			ds->skybox = qfalse;
		}
		else
		{
			/* refs initially zero */
			refs = 0;
			
			/* apply texture coordinate mods */
			for( j = 0; j < ds->numVerts; j++ )
				TCMod( si->mod, ds->verts[ j ].st );
			
			/* ydnar: apply shader colormod */
			ColorMod( ds->shaderInfo->colorMod, ds->numVerts, ds->verts );
			
			/* ydnar: apply brush colormod */
			VolumeColorMods( e, ds );
			
			/* ydnar: make fur surfaces */
			if( si->furNumLayers > 0 )
				Fur( ds );
			
			/* ydnar/sd: make foliage surfaces */
			if( si->foliage != NULL )
				Foliage( ds );
			
			/* create a flare surface if necessary */
			if( si->flareShader != NULL && si->flareShader[ 0 ] )
				AddSurfaceFlare( ds, e->origin );
			
			/* ydnar: don't emit nodraw surfaces (like nodraw fog) */
			if( si != NULL && (si->compileFlags & C_NODRAW) && ds->type != SURFACE_PATCH )
				continue;
			
			/* ydnar: bias the surface textures */
			BiasSurfaceTextures( ds );
			
			/* ydnar: globalizing of fog volume handling (eek a hack) */
			if( e != entities && si->noFog == qfalse )
			{
				/* find surface origin and offset by entity origin */
				VectorAdd( ds->mins, ds->maxs, origin );
				VectorScale( origin, 0.5f, origin );
				VectorAdd( origin, e->origin, origin );
				
				VectorAdd( ds->mins, e->origin, mins );
				VectorAdd( ds->maxs, e->origin, maxs );
				
				/* set the fog number for this surface */
				ds->fogNum = FogForBounds( mins, maxs, 1.0f );	//%	FogForPoint( origin, 0.0f );
			}
		}
		
		/* ydnar: remap shader */
		if( ds->shaderInfo->remapShader && ds->shaderInfo->remapShader[ 0 ] )
			ds->shaderInfo = ShaderInfoForShader( ds->shaderInfo->remapShader );
		
		/* ydnar: gs mods: handle the various types of surfaces */
		switch( ds->type )
		{
			/* handle brush faces */
			case SURFACE_FACE:
			case SURFACE_DECAL:
				if( refs == 0 )
					refs = FilterFaceIntoTree( ds, tree );
				if( refs > 0 )
					EmitFaceSurface( ds );
				break;
			
			/* handle patches */
			case SURFACE_PATCH:
				if( refs == 0 )
					refs = FilterPatchIntoTree( ds, tree );
				if( refs > 0 )
					EmitPatchSurface( ds );
				break;
			
			/* handle triangle surfaces */
			case SURFACE_TRIANGLES:
			case SURFACE_FORCED_META:
			case SURFACE_META:
				//%	Sys_FPrintf( SYS_VRB, "Surface %4d: [%1d] %4d verts %s\n", numSurfs, ds->planar, ds->numVerts, si->shader );
				if( refs == 0 )
					refs = FilterTrianglesIntoTree( ds, tree );
				if( refs > 0 )
					EmitTriangleSurface( ds );
				break;
			
			/* handle foliage surfaces (splash damage/wolf et) */
			case SURFACE_FOLIAGE:
				//%	Sys_FPrintf( SYS_VRB, "Surface %4d: [%d] %4d verts %s\n", numSurfs, ds->numFoliageInstances, ds->numVerts, si->shader );
				if( refs == 0 )
					refs = FilterFoliageIntoTree( ds, tree );
				if( refs > 0 )
					EmitTriangleSurface( ds );
				break;
			
			/* handle foghull surfaces */
			case SURFACE_FOGHULL:
				if( refs == 0 )
					refs = AddReferenceToTree_r( ds, tree->headnode, qfalse );
				if( refs > 0 )
					EmitTriangleSurface( ds );
				break;
			
			/* handle flares */
			case SURFACE_FLARE:
				if( refs == 0 )
					refs = FilterFlareSurfIntoTree( ds, tree );
				if( refs > 0 )
					EmitFlareSurface( ds );
				break;
			
			/* handle shader-only surfaces */
			case SURFACE_SHADER:
				refs = 1;
				EmitFlareSurface( ds );
				break;
			
			/* no references */
			default:
				refs = 0;
				break;
		}
		
		/* tot up the references */
		if( refs > 0 )
		{
			/* tot up counts */
			numSurfs++;
			numRefs += refs;
			
			/* emit extra surface data */
			SetSurfaceExtra( ds, numBSPDrawSurfaces - 1 );
			//%	Sys_FPrintf( SYS_VRB, "%d verts %d indexes\n", ds->numVerts, ds->numIndexes );
			
			/* one last sanity check */
			{
				bspDrawSurface_t	*out;
				out = &bspDrawSurfaces[ numBSPDrawSurfaces - 1 ];
				if( out->numVerts == 3 && out->numIndexes > 3 )
				{
					Sys_Printf( "\nWARNING: Potentially bad %s surface (%d: %d, %d)\n     %s\n",
						surfaceTypes[ ds->type ],
						numBSPDrawSurfaces - 1, out->numVerts, out->numIndexes, si->shader );
				}
			}
			
			/* ydnar: handle skybox surfaces */
			if( ds->skybox )
			{
				MakeSkyboxSurface( ds );
				numSkyboxSurfaces++;
			}
		}
	}
	
	/* emit some statistics */
	Sys_FPrintf( SYS_VRB, "%9d references\n", numRefs );
	Sys_FPrintf( SYS_VRB, "%9d (%d) emitted drawsurfs\n", numSurfs, numBSPDrawSurfaces );
	Sys_FPrintf( SYS_VRB, "%9d stripped face surfaces\n", numStripSurfaces );
	Sys_FPrintf( SYS_VRB, "%9d fanned face surfaces\n", numFanSurfaces );
	Sys_FPrintf( SYS_VRB, "%9d surface models generated\n", numSurfaceModels );
	Sys_FPrintf( SYS_VRB, "%9d skybox surfaces generated\n", numSkyboxSurfaces );
	for( i = 0; i < NUM_SURFACE_TYPES; i++ )
		Sys_FPrintf( SYS_VRB, "%9d %s surfaces\n", numSurfacesByType[ i ], surfaceTypes[ i ] );
	
	Sys_FPrintf( SYS_VRB, "%9d redundant indexes supressed, saving %d Kbytes\n", numRedundantIndexes, (numRedundantIndexes * 4 / 1024) );
}