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

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// r_surf.c: surface-related refresh code

#include "quakedef.h"
#ifndef SERVERONLY
#include "glquake.h"
#include "shader.h"
#include "renderque.h"
#include "com_mesh.h"
#include <math.h>

#if (defined(GLQUAKE) || defined(VKQUAKE)) && defined(MULTITHREAD)
#define THREADEDWORLD
int webo_blocklightmapupdates;	//0 no webo, &1=using threadedworld, &2=already uploaded. so update when !=3
#else
#define webo_blocklightmapupdates 0
#endif
#ifdef BEF_PUSHDEPTH
qboolean r_pushdepth;
#endif

extern cvar_t		r_ambient;

static vec3_t		modelorg;	/*set before recursively entering the visible surface finder*/

model_t				*currentmodel;

static size_t		maxblocksize;
static vec3_t		*blocknormals;
static unsigned		*blocklights;

lightmapinfo_t **lightmap;
int numlightmaps;
extern const float rgb9e5tab[32];

extern mleaf_t		*r_vischain;		// linked list of visible leafs

extern cvar_t r_stains;
extern cvar_t r_loadlits;
extern cvar_t r_stainfadetime;
extern cvar_t r_stainfadeammount;
extern cvar_t r_lightmap_nearest;
extern cvar_t r_lightmap_format;

extern int r_dlightframecount;

static void Surf_FreeLightmap(lightmapinfo_t *lm);

static int lightmap_shift;
int Surf_LightmapShift (model_t *model)
{
	extern cvar_t gl_overbright_all, gl_overbright;

	if (gl_overbright_all.ival || (model->engineflags & MDLF_NEEDOVERBRIGHT))
		lightmap_shift = bound(0, gl_overbright.ival, 2);
	else
		lightmap_shift = 0;
	return lightmap_shift;
}

void QDECL Surf_RebuildLightmap_Callback (struct cvar_s *var, char *oldvalue)
{
	Mod_RebuildLightmaps();
}

//radius, x y z, r g b
void Surf_StainSurf (msurface_t *surf, float *parms)
{
	int			sd, td;
	float		dist, rad, minlight;
	float change;
	vec3_t		impact, local;
	int			s, t;
	int			i;
	int			smax, tmax;
	float amm;
	int lim;
	mtexinfo_t	*tex;
	stmap *stainbase;
	lightmapinfo_t *lm;

	lim = 255 - (r_stains.value*255);

#define stain(x)							\
	change = stainbase[(s)*3+x] + amm*parms[4+x];	\
	stainbase[(s)*3+x] = bound(lim, change, 255);

	if (surf->lightmaptexturenums[0] < 0)
		return;
	lm = lightmap[surf->lightmaptexturenums[0]];

	smax = (surf->extents[0]>>surf->lmshift)+1;
	tmax = (surf->extents[1]>>surf->lmshift)+1;
	tex = surf->texinfo;

	stainbase = lm->stainmaps;
	stainbase += (surf->light_t[0] * lm->width + surf->light_s[0]) * 3;

	rad = *parms;
	dist = DotProduct ((parms+1), surf->plane->normal) - surf->plane->dist;
	rad -= fabs(dist);
	minlight = 0;
	if (rad < minlight)	//not hit
		return;
	minlight = rad - minlight;

	for (i=0 ; i<3 ; i++)
	{
		impact[i] = (parms+1)[i] - surf->plane->normal[i]*dist;
	}

	local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3];
	local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3];

	local[0] -= surf->texturemins[0];
	local[1] -= surf->texturemins[1];

	for (t = 0 ; t<tmax ; t++)
	{
		td = local[1] - (t<<surf->lmshift);
		if (td < 0)
			td = -td;
		for (s=0 ; s<smax ; s++)
		{
			sd = local[0] - (s<<surf->lmshift);
			if (sd < 0)
				sd = -sd;
			if (sd > td)
				dist = sd + (td>>1);
			else
				dist = td + (sd>>1);
			if (dist < minlight)
			{
				amm = (rad - dist);
				stain(0);
				stain(1);
				stain(2);

				surf->stained = true;
			}
		}
		stainbase += 3*lm->width;
	}

	if (surf->stained)
		surf->cached_dlight=-1;
}

//combination of R_AddDynamicLights and R_MarkLights
/*
static void Surf_StainNode (mnode_t *node, float *parms)
{
	mplane_t	*splitplane;
	float		dist;
	msurface_t	*surf;
	int			i;

	if (node->contents < 0)
		return;

	splitplane = node->plane;
	dist = DotProduct ((parms+1), splitplane->normal) - splitplane->dist;

	if (dist > (*parms))
	{
		Surf_StainNode (node->children[0], parms);
		return;
	}
	if (dist < (-*parms))
	{
		Surf_StainNode (node->children[1], parms);
		return;
	}

// mark the polygons
	surf = cl.worldmodel->surfaces + node->firstsurface;
	for (i=0 ; i<node->numsurfaces ; i++, surf++)
	{
		if (surf->flags&~(SURF_DONTWARP|SURF_PLANEBACK))
			continue;
		Surf_StainSurf(surf, parms);
	}

	Surf_StainNode (node->children[0], parms);
	Surf_StainNode (node->children[1], parms);
}
*/

void Surf_AddStain(vec3_t org, float red, float green, float blue, float radius)
{
	physent_t *pe;
	int i;

	float parms[7];
	if (!cl.worldmodel || cl.worldmodel->loadstate != MLS_LOADED || r_stains.value <= 0)
		return;
	parms[0] = radius;
	parms[1] = org[0];
	parms[2] = org[1];
	parms[3] = org[2];
	parms[4] = red;
	parms[5] = green;
	parms[6] = blue;


	cl.worldmodel->funcs.StainNode(cl.worldmodel->rootnode, parms);

	//now stain inline bsp models other than world.

	for (i=1 ; i< pmove.numphysent ; i++)	//0 is world...
	{
		pe = &pmove.physents[i];
		if (pe->model && pe->model->surfaces == cl.worldmodel->surfaces && pe->model->loadstate == MLS_LOADED)
		{
			parms[1] = org[0] - pe->origin[0];
			parms[2] = org[1] - pe->origin[1];
			parms[3] = org[2] - pe->origin[2];

			if (pe->angles[0] || pe->angles[1] || pe->angles[2])
			{
				vec3_t f, r, u, temp;
				AngleVectors(pe->angles, f, r, u);
				VectorCopy((parms+1), temp);
				parms[1] = DotProduct(temp, f);
				parms[2] = -DotProduct(temp, r);
				parms[3] = DotProduct(temp, u);
			}


			pe->model->funcs.StainNode(pe->model->rootnode, parms);
		}
	}
}

void Surf_WipeStains(void)
{
	int i;
	for (i = 0; i < numlightmaps; i++)
	{
		if (!lightmap[i])
			break;
		if (lightmap[i]->stainmaps)
			memset(lightmap[i]->stainmaps, 255, lightmap[i]->width*lightmap[i]->height*3*sizeof(stmap));
	}
}

void Surf_LessenStains(void)
{
	int i;
	msurface_t	*surf;

	int			smax, tmax;
	int			s, t;
	stmap *stain;
	int stride;
	int ammount;
	int limit;
	lightmapinfo_t *lm;

	static float time;

	if (!r_stains.value || !r_stainfadeammount.value)
		return;

	time += host_frametime;
	if (time < r_stainfadetime.value)
		return;
	time-=r_stainfadetime.value;

	ammount = r_stainfadeammount.value;
	limit = 255 - ammount;

	surf = cl.worldmodel->surfaces;
	for (i=0 ; i<cl.worldmodel->numsurfaces ; i++, surf++)
	{
		if (surf->stained)
		{
			lm = lightmap[surf->lightmaptexturenums[0]];

			surf->cached_dlight=-1;//nice hack here...

			smax = (surf->extents[0]>>surf->lmshift)+1;
			tmax = (surf->extents[1]>>surf->lmshift)+1;

			stain = lm->stainmaps;
			stain += (surf->light_t[0] * lm->width + surf->light_s[0]) * 3;

			stride = (lm->width-smax)*3;

			surf->stained = false;

			smax*=3;

			for (t = 0 ; t<tmax ; t++, stain+=stride)
			{
				for (s=0 ; s<smax ; s++)
				{
					if (*stain < limit)	//eventually decay to 255
					{
						*stain += ammount;
						surf->stained=true;
					}
					else	//reset to 255
						*stain = 255;

					stain++;
				}
			}
		}
	}
}

/*
===============
R_AddDynamicLights
===============
*/
static void Surf_AddDynamicLights_Lum (msurface_t *surf)
{
	size_t		lnum;
	int			sd, td;
	float		dist, rad, minlight;
	vec3_t		impact, local;
	int			s, t;
	int			i;
	int			smax, tmax;
	mtexinfo_t	*tex;
	float a;
	unsigned	*bl;

	smax = (surf->extents[0]>>surf->lmshift)+1;
	tmax = (surf->extents[1]>>surf->lmshift)+1;
	tex = surf->texinfo;

	for (lnum=rtlights_first; lnum<RTL_FIRST; lnum++)
	{
		if ( !(surf->dlightbits & ((dlightbitmask_t)1u<<lnum) ) )
			continue;		// not lit by this light

		if (!(cl_dlights[lnum].flags & LFLAG_LIGHTMAP))
			continue;

		rad = cl_dlights[lnum].radius;
		dist = DotProduct (cl_dlights[lnum].origin, surf->plane->normal) -
				surf->plane->dist;
		rad -= fabs(dist);
		minlight = cl_dlights[lnum].minlight;
		if (rad < minlight)
			continue;
		minlight = rad - minlight;

		for (i=0 ; i<3 ; i++)
		{
			impact[i] = cl_dlights[lnum].origin[i] -
					surf->plane->normal[i]*dist;
		}

		local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3];
		local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3];

		local[0] -= surf->texturemins[0];
		local[1] -= surf->texturemins[1];

		a = 256*(cl_dlights[lnum].color[0]*NTSC_RED + cl_dlights[lnum].color[1]*NTSC_GREEN + cl_dlights[lnum].color[2]*NTSC_BLUE);

		bl = blocklights;
		for (t = 0 ; t<tmax ; t++)
		{
			td = local[1] - (t<<surf->lmshift);
			if (td < 0)
				td = -td;
			for (s=0 ; s<smax ; s++)
			{
				sd = local[0] - (s<<surf->lmshift);
				if (sd < 0)
					sd = -sd;
				if (sd > td)
					dist = sd + (td>>1);
				else
					dist = td + (sd>>1);
				if (dist < minlight)
					bl[0] += (rad - dist)*a;
				bl++;
			}
		}
	}
}

/*
static void Surf_AddDynamicLightNorms (msurface_t *surf)
{
	int			lnum;
	int			sd, td;
	float		dist, rad, minlight;
	vec3_t		impact, local;
	int			s, t;
	int			i;
	int			smax, tmax;
	mtexinfo_t	*tex;
	float a;

	smax = (surf->extents[0]>>4)+1;
	tmax = (surf->extents[1]>>4)+1;
	tex = surf->texinfo;

	for (lnum=rtlights_first; lnum<RTL_FIRST; lnum++)
	{
		if ( !(surf->dlightbits & ((dlightbitmask_t)1u<<lnum) ) )
			continue;		// not lit by this light

		if (!(cl_dlights[lnum].flags & LFLAG_ALLOW_LMHACK))
			continue;

		rad = cl_dlights[lnum].radius;
		dist = DotProduct (cl_dlights[lnum].origin, surf->plane->normal) -
				surf->plane->dist;
		rad -= fabs(dist);
		minlight = cl_dlights[lnum].minlight;
		if (rad < minlight)
			continue;
		minlight = rad - minlight;

		for (i=0 ; i<3 ; i++)
		{
			impact[i] = cl_dlights[lnum].origin[i] -
					surf->plane->normal[i]*dist;
		}

		local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3];
		local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3];

		local[0] -= surf->texturemins[0];
		local[1] -= surf->texturemins[1];

		a = 256*(cl_dlights[lnum].color[0]*NTSC_RED + cl_dlights[lnum].color[1]*NTSC_GREEN + cl_dlights[lnum].color[2]*NTSC_BLUE);

		for (t = 0 ; t<tmax ; t++)
		{
			td = local[1] - t*surf->lmscale;
			if (td < 0)
				td = -td;
			for (s=0 ; s<smax ; s++)
			{
				sd = local[0] - s*surf->lmscale;
				if (sd < 0)
					sd = -sd;
				if (sd > td)
					dist = sd + (td>>1);
				else
					dist = td + (sd>>1);
				if (dist < minlight)
				{
//					blocknormals[t*smax + s][0] -= (rad - dist)*(impact[0]-local[0])/8192.0;
//					blocknormals[t*smax + s][1] -= (rad - dist)*(impact[1]-local[1])/8192.0;
					blocknormals[t*smax + s][2] += 0.5*blocknormals[t*smax + s][2]*(rad - dist)/256;
				}
			}
		}
	}
}
*/

#ifdef PEXT_LIGHTSTYLECOL
static void Surf_AddDynamicLights_RGB (msurface_t *surf)
{
	int			lnum;
	int			sd, td;
	float		dist, rad, minlight;
	vec3_t		impact, local;
	int			s, t;
	int			i;
	int			smax, tmax;
	mtexinfo_t	*tex;
//	float temp;
	float r, g, b;
	unsigned	*bl;
	vec3_t lightofs;

	smax = (surf->extents[0]>>surf->lmshift)+1;
	tmax = (surf->extents[1]>>surf->lmshift)+1;
	tex = surf->texinfo;

	for (lnum=rtlights_first; lnum<RTL_FIRST; lnum++)
	{
		if ( !(surf->dlightbits & ((dlightbitmask_t)1u<<lnum) ) )
			continue;		// not lit by this light

		rad = cl_dlights[lnum].radius;
		VectorSubtract(cl_dlights[lnum].origin, currententity->origin, lightofs);
		//FIXME: transform by forward/right/up
		dist = DotProduct (lightofs, surf->plane->normal) - surf->plane->dist;
		rad -= fabs(dist);
		minlight = cl_dlights[lnum].minlight;
		if (rad < minlight)
			continue;
		minlight = rad - minlight;

		for (i=0 ; i<3 ; i++)
		{
			impact[i] = lightofs[i] -
					surf->plane->normal[i]*dist;
		}

		local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3];
		local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3];

		local[0] -= surf->texturemins[0];
		local[1] -= surf->texturemins[1];

		if (r_dynamic.ival == 2)
			r = g = b = 256;
		else
		{
			r = cl_dlights[lnum].color[0]*128;
			g = cl_dlights[lnum].color[1]*128;
			b = cl_dlights[lnum].color[2]*128;
		}

		bl = blocklights;
		if (r < 0 || g < 0 || b < 0)
		{
			for (t = 0 ; t<tmax ; t++)
			{
				td = local[1] - (t<<surf->lmshift);
				if (td < 0)
					td = -td;
				for (s=0 ; s<smax ; s++)
				{
					sd = local[0] - (s<<surf->lmshift);
					if (sd < 0)
						sd = -sd;
					if (sd > td)
						dist = sd + (td>>1);
					else
						dist = td + (sd>>1);
					if (dist < minlight)
					{
						i = bl[0] + (rad - dist)*r;
						bl[0] = (i<0)?0:i;
						i = bl[1] + (rad - dist)*g;
						bl[1] = (i<0)?0:i;
						i = bl[2] + (rad - dist)*b;
						bl[2] = (i<0)?0:i;
					}
					bl += 3;
				}
			}
		}
		else
		{
			for (t = 0 ; t<tmax ; t++)
			{
				td = local[1] - (t<<surf->lmshift);
				if (td < 0)
					td = -td;
				for (s=0 ; s<smax ; s++)
				{
					sd = local[0] - (s<<surf->lmshift);
					if (sd < 0)
						sd = -sd;
					if (sd > td)
						dist = sd + (td>>1);
					else
						dist = td + (sd>>1);
					if (dist < minlight)
					{
						bl[0] += (rad - dist)*r;
						bl[1] += (rad - dist)*g;
						bl[2] += (rad - dist)*b;
					}
					bl += 3;
				}
			}
		}
	}
}
#endif



static void Surf_BuildDeluxMap (model_t *wmodel, msurface_t *surf, qbyte *dest, lightmapinfo_t *lm, vec3_t *blocknormals)
{
	int			smax, tmax;
	int			i, j, size;
	qbyte		*lightmap;
	qbyte		*deluxmap;
	unsigned	scale;
	int			maps;
	float intensity;
	vec_t		*bnorm;
	vec3_t temp;

	int stride;

	if (!dest)
		return;

	smax = (surf->extents[0]>>surf->lmshift)+1;
	tmax = (surf->extents[1]>>surf->lmshift)+1;
	size = smax*tmax;
	lightmap = surf->samples;

	// set to full bright if no light data
	if (!wmodel->deluxdata)
	{
		for (i=0 ; i<size ; i++)
		{
			blocknormals[i][0] = 0.9;//surf->orientation[2][0];
			blocknormals[i][1] = 0.8;//surf->orientation[2][1];
			blocknormals[i][2] = 1;//surf->orientation[2][2];
		}
		goto store;
	}

// clear to no light
	for (i=0 ; i<size ; i++)
	{
		blocknormals[i][0] = 0;
		blocknormals[i][1] = 0;
		blocknormals[i][2] = 0;
	}

// add all the lightmaps
	if (lightmap)
	{
		switch(wmodel->lightmaps.fmt)
		{
		case LM_E5BGR9:
			deluxmap = ((surf->samples - wmodel->lightdata)/4)*3 + wmodel->deluxdata;
			for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
			{
				scale = d_lightstylevalue[surf->styles[maps]];
				for (i=0 ; i<size ; i++)
				{
					unsigned lm = ((unsigned int*)lightmap)[i];
					intensity = max3(((lm>>0)&0x1ff),((lm>>9)&0x1ff),((lm>>18)&0x1ff)) * scale * (rgb9e5tab[lm>>27]*(1<<7));
					blocknormals[i][0] += intensity*(deluxmap[i*3+0]-127);
					blocknormals[i][1] += intensity*(deluxmap[i*3+1]-127);
					blocknormals[i][2] += intensity*(deluxmap[i*3+2]-127);
				}
				lightmap += size*4;	// skip to next lightmap
				deluxmap += size*3;
			}
			break;
		case LM_RGB8:
			deluxmap = surf->samples - wmodel->lightdata + wmodel->deluxdata;
			for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
			{
				scale = d_lightstylevalue[surf->styles[maps]];
				for (i=0 ; i<size ; i++)
				{
					intensity = (lightmap[i*3]+lightmap[i*3+1]+lightmap[i*3+2]) * scale;
					blocknormals[i][0] += intensity*(deluxmap[i*3+0]-127);
					blocknormals[i][1] += intensity*(deluxmap[i*3+1]-127);
					blocknormals[i][2] += intensity*(deluxmap[i*3+2]-127);
				}
				lightmap += size*3;	// skip to next lightmap
				deluxmap += size*3;
			}
			break;
		case LM_L8:
			deluxmap = (surf->samples - wmodel->lightdata)*3 + wmodel->deluxdata;
			for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
			{
				scale = d_lightstylevalue[surf->styles[maps]];
				for (i=0 ; i<size ; i++)
				{
					intensity = (lightmap[i]) * scale;
					blocknormals[i][0] += intensity*(deluxmap[i*3+0]-127);
					blocknormals[i][1] += intensity*(deluxmap[i*3+1]-127);
					blocknormals[i][2] += intensity*(deluxmap[i*3+2]-127);
				}
				lightmap += size;	// skip to next lightmap
				deluxmap += size*3;
			}
			break;
		}
	}

store:
	// add all the dynamic lights
//	if (surf->dlightframe == r_dlightframecount)
//		GLR_AddDynamicLightNorms (surf);

// bound, invert, and shift

	switch (lm->fmt)
	{
	default:
		Sys_Error("Bad deluxemap format\n");
		break;
	case PTI_A2BGR10:
		{
			unsigned int *destl = (void*)dest, r;

			stride = (lm->width-smax);
			bnorm = blocknormals[0];
			for (i=0 ; i<tmax ; i++, destl += stride)
			{
				for (j=0 ; j<smax ; j++)
				{
					temp[0] = bnorm[0];
					temp[1] = bnorm[1];
					temp[2] = bnorm[2];	//half the effect? so we emulate light's scalecos of 0.5
					bnorm+=3;
					VectorNormalize(temp);
					r  = (unsigned int)((temp[0]+1)/2*1023)<<0;
					r |= (unsigned int)((temp[1]+1)/2*1023)<<10;
					r |= (unsigned int)((temp[2]+1)/2*1023)<<20;
					*destl++ = r;
				}
			}
		}
		break;
	case PTI_BGRX8:
		stride = (lm->width-smax)*4;
		bnorm = blocknormals[0];
		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				temp[0] = bnorm[0];
				temp[1] = bnorm[1];
				temp[2] = bnorm[2];	//half the effect? so we emulate light's scalecos of 0.5
				VectorNormalize(temp);
				dest[2] = (temp[0]+1)/2*255;
				dest[1] = (temp[1]+1)/2*255;
				dest[0] = (temp[2]+1)/2*255;

				dest += 4;
				bnorm+=3;
			}
		}
		break;
	case PTI_RGBX8:
	case PTI_RGB8:
		stride = (lm->width-smax)*lm->pixbytes;
		bnorm = blocknormals[0];
		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				temp[0] = bnorm[0];
				temp[1] = bnorm[1];
				temp[2] = bnorm[2];	//half the effect? so we emulate light's scalecos of 0.5
				VectorNormalize(temp);
				dest[0] = (temp[0]+1)/2*255;
				dest[1] = (temp[1]+1)/2*255;
				dest[2] = (temp[2]+1)/2*255;

				dest += lm->pixbytes;
				bnorm+=3;
			}
		}
		break;
	}
}

static unsigned int Surf_PackE5BRG9(int r, int g, int b, int shift)
{	//5 bits exponent, 3*9 bits of mantissa. no sign bit.
	int e = 0;
	float m = max(max(r, g), b) / (float)(1u<<shift);
	float scale;

	if (m >= 0.5)
	{	//positive exponent
		while (m >= (1u<<(e)) && e < 30-15)	//don't do nans.
			e++;
	}
	else
	{	//negative exponent...
		while (m < 1/(1u<<-e) && e > -15)	//don't do denormals.
			e--;
	}

	scale = pow(2, e-9);
	scale *= (1u<<shift);

	r = bound(0, r/scale + 0.5, 0x1ff);
	g = bound(0, g/scale + 0.5, 0x1ff);
	b = bound(0, b/scale + 0.5, 0x1ff);

	return ((e+15)<<27) | (b<<18) | (g<<9) | r;
}

static unsigned short Surf_GenHalf(float val)
{	//1-bit sign (ignored here)
	//5-bit exponent (biased by 15)
	//10-bit mantissa (normalised, so effectively 11 bits when exponent!=0)
	union 
	{
		float f;
		unsigned int u;
	} u = {val};
	int e = 0;
	int m;

	e = ((u.u>>23)&0xff) - 127;
	if (e < -15)
		return 0; //too small exponent, treat it as a 0 denormal
	if (e > 15)
		m = 0; //infinity instead of a nan
	else
		m = (u.u&((1u<<23)-1))>>13;
	return ((e+15)<<10) | m;
}
static void Surf_PackRGB16F(void *result, int r, int g, int b, int one)
{
#if 0
	//bulldozer+ or skylake+ supposedly. which means I can't test it, which means I can't enable it.
	__v4sf rgba = (__v4sf){r, g, b, one} / (float)one;
	union
	{
		__v8hi v;
		__v4hi i;
	} tmp;
	//vcvtps2ph writes either a 64bit mem location, or the lower half of an xmm register. unfortunately ts still an xmm register, and that's 128bit.
	//the __vXhi weirdness is because half-floats just don't work anywhere but conversions so __vXhf would cause all sorts of compiler errors, is the theory
	tmp.v = __builtin_ia32_vcvtps2ph(rgba, 1);
	*(__v4hi*)result = tmp.i;
#else
	((unsigned short*)result)[0] = Surf_GenHalf(r / (float)one);
	((unsigned short*)result)[1] = Surf_GenHalf(g / (float)one);
	((unsigned short*)result)[2] = Surf_GenHalf(b / (float)one);
	((unsigned short*)result)[3] = /*Surf_GenHalf(1.0);*/0x0fu<<10; //a standard ieee float should have all but the lead bit set of its exponent, and its mantissa 0.
#endif
}
static void Surf_PackRGBX32F(void *result, int r, int g, int b, int one)
{
	((float*)result)[0] = r/(float)one;
	((float*)result)[1] = g/(float)one;
	((float*)result)[2] = b/(float)one;
	((float*)result)[3] = 1.0;
}

/*any sane compiler will inline and split this, removing the stainsrc stuff
just unpacks the internal lightmap block into texture info ready for upload
merges stains and oversaturates overbrights.
*/
static void Surf_StoreLightmap_RGB(qbyte *dest, unsigned int *bl, int smax, int tmax, unsigned int shift, stmap *stainsrc, lightmapinfo_t *lm)
{
	int r, g, b, m;
	unsigned int i, j;
	int stride;

	switch(lm->fmt)
	{
	default:
		Sys_Error("Bad lightmap_fmt\n");
		break;
	case PTI_A2BGR10:
		stride = (lm->width-smax)<<2;

		shift -= 2;

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				// quake 2 method, scale highest down to
				// maintain hue
				m = max(max(r, g), b);
				if (m > 1023)
				{
					r *= 1023.0/m;
					g *= 1023.0/m;
					b *= 1023.0/m;
				}

				*(unsigned int*)dest = (3u<<30) | ((b&0x3ff)<<20) | ((g&0x3ff)<<10) | (r&0x3ff);
				dest += 4;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_E5BGR9:
		stride = (lm->width-smax)<<2;

		//5bit shared exponent, with bias of 15.
		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++;
				g = *bl++;
				b = *bl++;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				*(unsigned int*)dest = Surf_PackE5BRG9(r,g,b,shift+8);
				dest += 4;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_RGBA16F:
		stride = (lm->width-smax)<<3;
		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++;
				g = *bl++;
				b = *bl++;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				Surf_PackRGB16F(dest, r,g,b,1<<(shift+8));
				dest += 8;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_RGBA32F:
		shift = 1u<<(shift+8);
		stride = (lm->width-smax)<<4;
		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++;
				g = *bl++;
				b = *bl++;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				Surf_PackRGBX32F(dest, r,g,b,shift);
				dest += sizeof(float)*4;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_RGBX8:
	case PTI_RGBA8:
		stride = (lm->width-smax)<<2;

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				// quake 2 method, scale highest down to
				// maintain hue
				m = max(max(r, g), b);
				if (m > 255)
				{
					r *= 255.0/m;
					g *= 255.0/m;
					b *= 255.0/m;
				}

				dest[0] = r;
				dest[1] = g;
				dest[2] = b;
				dest[3] = 255;

				dest += 4;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_BGRX8:
	case PTI_BGRA8:
		stride = (lm->width-smax)<<2;

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				// quake 2 method, scale highest down to
				// maintain hue
				m = max(max(r, g), b);
				if (m > 255)
				{
					r *= 255.0/m;
					g *= 255.0/m;
					b *= 255.0/m;
				}

				dest[0] = b;
				dest[1] = g;
				dest[2] = r;
				dest[3] = 255;

				dest += 4;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
/*
	case PTI_BGRX8:
	case PTI_BGRA8:
		stride = (lm->width-smax)<<2;

		bl = blocklights;

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				if (r > 255)
					dest[2] = 255;
				else if (r < 0)
					dest[2] = 0;
				else
					dest[2] = r;

				if (g > 255)
					dest[1] = 255;
				else if (g < 0)
					dest[1] = 0;
				else
					dest[1] = g;

				if (b > 255)
					dest[0] = 255;
				else if (b < 0)
					dest[0] = 0;
				else
					dest[0] = b;

				dest[3] = 255;
				dest += 4;
			}
			if (stainsrc)
				stainsrc += (lmwidth - smax)*3;
		}
		break;
*/
	case PTI_RGB565:
		stride = (lm->width-smax)<<1;

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				// quake 2 method, scale highest down to
				// maintain hue
				m = max(max(r, g), b);
				if (m > 255)
				{
					r *= 255.0/m;
					g *= 255.0/m;
					b *= 255.0/m;
				}

				*(unsigned short*)dest = (b>>3) | ((g>>2)<<5) | ((r>>3)<<11);
				dest += 2;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_RGBA4444:
		stride = (lm->width-smax)<<1;

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				// quake 2 method, scale highest down to
				// maintain hue
				m = max(max(r, g), b);
				if (m > 255)
				{
					r *= 255.0/m;
					g *= 255.0/m;
					b *= 255.0/m;
				}

				*(unsigned short*)dest = ((r>>4)<<12) | ((g>>4)<<8) | ((b>>4)<<4) | 0x000f;
				dest += 2;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_RGBA5551:
		stride = (lm->width-smax)<<1;

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				// quake 2 method, scale highest down to
				// maintain hue
				m = max(max(r, g), b);
				if (m > 255)
				{
					r *= 255.0/m;
					g *= 255.0/m;
					b *= 255.0/m;
				}

				*(unsigned short*)dest = ((r>>3)<<11) | ((g>>3)<<6) | ((b>>3)<<1) | 0x0001;
				dest += 2;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_ARGB4444:
		stride = (lm->width-smax)<<1;

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				// quake 2 method, scale highest down to
				// maintain hue
				m = max(max(r, g), b);
				if (m > 255)
				{
					r *= 255.0/m;
					g *= 255.0/m;
					b *= 255.0/m;
				}

				*(unsigned short*)dest = 0xf000 | ((r>>4)<<8) | ((g>>4)<<4) | ((b>>4)<<0);
				dest += 2;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_ARGB1555:
		stride = (lm->width-smax)<<1;

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				// quake 2 method, scale highest down to
				// maintain hue
				m = max(max(r, g), b);
				if (m > 255)
				{
					r *= 255.0/m;
					g *= 255.0/m;
					b *= 255.0/m;
				}

				*(unsigned short*)dest = 0x8000 | ((r>>3)<<10) | ((g>>3)<<5) | ((b>>3)<<0);
				dest += 2;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	case PTI_RGB8:
		stride = lm->width*3 - (smax*3);

		for (i=0 ; i<tmax ; i++, dest += stride)
		{
			for (j=0 ; j<smax ; j++)
			{
				r = *bl++ >> shift;
				g = *bl++ >> shift;
				b = *bl++ >> shift;

				if (stainsrc)	// merge in stain
				{
					r = (127+r*(*stainsrc++)) >> 8;
					g = (127+g*(*stainsrc++)) >> 8;
					b = (127+b*(*stainsrc++)) >> 8;
				}

				// quake 2 method, scale highest down to
				// maintain hue
				m = max(max(r, g), b);
				if (m > 255)
				{
					r *= 255.0/m;
					g *= 255.0/m;
					b *= 255.0/m;
				}

				dest[0] = r;
				dest[1] = g;
				dest[2] = b;
				dest += 3;
			}
			if (stainsrc)
				stainsrc += (lm->width - smax)*3;
		}
		break;
	}
}
static void Surf_StoreLightmap_Lum(qbyte *dest, unsigned int *bl, int smax, int tmax, unsigned int shift, stmap *stainsrc, unsigned int lmwidth)
{
	int t;
	unsigned int i, j;

	for (i=0 ; i<tmax ; i++, dest += lmwidth)
	{
		for (j=0 ; j<smax ; j++)
		{
			t = *bl++;
			t >>= shift;
			if (t > 255)
				t = 255;
			dest[j] = t;
		}
	}
}

/*
===============
R_BuildLightMap

Combine and scale multiple lightmaps into the 8.8 format in blocklights
===============
*/
static void Surf_BuildLightMap (model_t *model, msurface_t *surf, int map, int shift, int ambient, int *d_lightstylevalue)
{
	int			smax = (surf->extents[0]>>surf->lmshift)+1;
	int			tmax = (surf->extents[1]>>surf->lmshift)+1;
	int			t;
	int			i;
	size_t		size = (size_t)smax*tmax;
	unsigned	scalergb[3];
	unsigned	scale;
	int			maps;
	unsigned	*bl;
	glRect_t	*theRect;
	void		*dest;
	void		*deluxedest;
	void		*stainsrc;
	lightmapinfo_t *lm = lightmap[surf->lightmaptexturenums[map]];
	qbyte		*src = surf->samples;

	shift += 7; // increase to base value
	surf->cached_dlight = (surf->dlightframe == r_dlightframecount);

	if (size > maxblocksize)
	{	//fixme: fill in?
		//Threading: this should not be a problem, all surfaces should have been built from the main thread at map load so it should have maxed it there.
		BZ_Free(blocklights);
		BZ_Free(blocknormals);

		maxblocksize = size;
		blocknormals = BZ_Malloc(maxblocksize * sizeof(*blocknormals));	//already a vector
		blocklights = BZ_Malloc(maxblocksize * 3*sizeof(*blocklights));
	}

	//make sure we flag the output rect properly.
	theRect = &lm->rectchange;
	if (theRect->t > surf->light_t[map])
		theRect->t = surf->light_t[map];
	if (theRect->l > surf->light_s[map])
		theRect->l = surf->light_s[map];
	if (theRect->r < surf->light_s[map]+smax)
		theRect->r = surf->light_s[map]+smax;
	if (theRect->b < surf->light_t[map]+tmax)
		theRect->b = surf->light_t[map]+tmax;

	dest = lm->lightmaps + (surf->light_t[map] * lm->width + surf->light_s[map]) * lm->pixbytes;
	if (!r_stains.value || !surf->stained)
		stainsrc = NULL;
	else
		stainsrc = lm->stainmaps + (surf->light_t[map] * lm->width + surf->light_s[map]) * 3;

	lm->modified = true;
	if (lm->hasdeluxe && model->deluxdata)
	{
		lightmapinfo_t *dlm = lightmap[surf->lightmaptexturenums[map]+1];
		dlm->modified = true;
		theRect = &dlm->rectchange;
		if (theRect->t > surf->light_t[map])
			theRect->t = surf->light_t[map];
		if (theRect->l > surf->light_s[map])
			theRect->l = surf->light_s[map];
		if (theRect->r < surf->light_s[map]+smax)
			theRect->r = surf->light_s[map]+smax;
		if (theRect->b < surf->light_t[map]+tmax)
			theRect->b = surf->light_t[map]+tmax;

		deluxedest = dlm->lightmaps + (surf->light_t[map] * dlm->width + surf->light_s[map]) * dlm->pixbytes;

		Surf_BuildDeluxMap(model, surf, deluxedest, dlm, blocknormals);
	}

	if (lm->fmt != PTI_L8)
	{
		// set to full bright if no light data
		if (ambient < 0)
		{
			t = (-1-ambient)*255;
			for (i=0 ; i<size*3 ; i++)
				blocklights[i] = t;
			for (maps = 0 ; maps < MAXCPULIGHTMAPS ; maps++)
			{
				surf->cached_light[maps] = -1-ambient;
				surf->cached_colour[maps] = 0xff;
			}
		}
		else if (r_fullbright.value>0)	//not qw
		{
			for (i=0 ; i<size*3 ; i++)
				blocklights[i] = r_fullbright.value*255*256;
			if (!surf->samples)
			{
				surf->cached_light[0] = d_lightstylevalue[0];
				surf->cached_colour[0] = cl_lightstyle[0].colourkey;
			}
			else
			{
				for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
				{
					surf->cached_light[maps] = d_lightstylevalue[surf->styles[maps]];
					surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
				}
			}
		}
		else if (!model->lightdata)
		{
			/*fullbright if map is not lit. but not overbright*/
			for (i=0 ; i<size*3 ; i++)
				blocklights[i] = 128*256;
		}
		else if (!surf->samples)
		{
			/*no samples, but map is otherwise lit = pure black*/
			for (i=0 ; i<size*3 ; i++)
				blocklights[i] = 0;
			surf->cached_light[0] = d_lightstylevalue[0];
			surf->cached_colour[0] = cl_lightstyle[0].colourkey;
		}
		else
		{
// clear to no light
			t = ambient;
			if (t == 0)
				memset(blocklights, 0, size*3*sizeof(*bl));
			else
			{
				for (i=0 ; i<size*3 ; i++)
				{
					blocklights[i] = t;
				}
			}

// add all the lightmaps
			if (src)
			{
				if (model->fromgame == fg_quake3)
					Sys_Error("Surf_BuildLightMap: q3bsp");
				switch(model->lightmaps.fmt)
				{
				case LM_E5BGR9:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						surf->cached_light[maps] = scale = d_lightstylevalue[surf->styles[maps]];	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						if (scale)
						{
							VectorScale(cl_lightstyle[surf->styles[maps]].colours, scale, scalergb);
							for (i=0 ; i<size ; i++)
							{
								unsigned int l = ((unsigned int*)src)[i];
								float e = rgb9e5tab[l>>27]*(1<<7);
								blocklights[i*3+0] += scalergb[0] * e * ((l>> 0)&0x1ff);
								blocklights[i*3+1] += scalergb[1] * e * ((l>> 9)&0x1ff);
								blocklights[i*3+2] += scalergb[2] * e * ((l>>18)&0x1ff);
							}
						}
						src += size*4;	// skip to next lightmap
					}
					break;
				case LM_RGB8:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						surf->cached_light[maps] = scale = d_lightstylevalue[surf->styles[maps]];
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						if (scale)
						{
							VectorScale(cl_lightstyle[surf->styles[maps]].colours, scale, scalergb);
							bl = blocklights;
							for (i=0 ; i<size ; i++)
							{
								*bl++		+=   *src++ * scalergb[0];
								*bl++		+=   *src++ * scalergb[1];
								*bl++		+=   *src++ * scalergb[2];
							}
						}
						else
							src += size*3;	// skip to next lightmap
					}
					break;

				case LM_L8:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ;
						 maps++)
					{
						surf->cached_light[maps] = scale = d_lightstylevalue[surf->styles[maps]];	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						if (scale)
						{
							VectorScale(cl_lightstyle[surf->styles[maps]].colours, scale, scalergb);
							bl = blocklights;
							for (i=0 ; i<size ; i++)
							{
								*bl++		+= *src * scalergb[0];
								*bl++		+= *src * scalergb[1];
								*bl++		+= *src * scalergb[2];
								src++;
							}
						}
						else
							src += size;	// skip to next lightmap
					}
					break;
				}
			}
		}

		// add all the dynamic lights
		if (surf->dlightframe == r_dlightframecount)
			Surf_AddDynamicLights_RGB (surf);

		Surf_StoreLightmap_RGB(dest, blocklights, smax, tmax, shift, stainsrc, lm);
	}
	else
	{
		// set to full bright if no light data
		if (ambient < 0)
		{
			t = (-1-ambient)*255;
			for (i=0 ; i<size ; i++)
				blocklights[i] = t;
			for (maps = 0 ; maps < MAXCPULIGHTMAPS ; maps++)
			{
				surf->cached_light[maps] = -1-ambient;
				surf->cached_colour[maps] = 0xff;
			}
		}
		else if (r_fullbright.value > 0)
		{	//r_fullbright is meant to be a scaler.
			for (i=0 ; i<size ; i++)
				blocklights[i] = r_fullbright.value*255*256;
			if (!surf->samples)
			{
				surf->cached_light[0] = d_lightstylevalue[0];
				surf->cached_colour[0] = cl_lightstyle[0].colourkey;
			}
			else
			{
				for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
				{
					surf->cached_light[maps] = d_lightstylevalue[surf->styles[maps]];
					surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
				}
			}
		}
		else if (!model->lightdata)
		{	//no scalers here.
			for (i=0 ; i<size ; i++)
				blocklights[i] = 255*256;
			surf->cached_light[0] = d_lightstylevalue[0];
			surf->cached_colour[0] = cl_lightstyle[0].colourkey;
		}
		//surfaces with no light data on lit maps are black
		else if (!surf->samples)
		{
			for (i=0 ; i<size*3 ; i++)
				blocklights[i] = 0;
			surf->cached_light[0] = d_lightstylevalue[0];
			surf->cached_colour[0] = cl_lightstyle[0].colourkey;
		}
		else
		{
// clear to no light
			for (i=0 ; i<size ; i++)
				blocklights[i] = 0;

// add all the lightmaps
			if (src)
			{
				switch(model->lightmaps.fmt)
				{
				case LM_E5BGR9:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						scale = d_lightstylevalue[surf->styles[maps]];
						surf->cached_light[maps] = scale;	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						for (i=0 ; i<size ; i++)
						{
							unsigned int lm = ((unsigned int *)src)[i];
							blocklights[i] += max3(((lm>>0)&0x1ff),((lm>>9)&0x1ff),((lm>>18)&0x1ff)) * scale * (rgb9e5tab[lm>>27]*(1<<7));
						}
						src += size*4;	// skip to next lightmap
					}
					break;
				case LM_RGB8:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						scale = d_lightstylevalue[surf->styles[maps]];
						surf->cached_light[maps] = scale;	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						for (i=0 ; i<size ; i++)
							blocklights[i] += max3(src[i*3],src[i*3+1],src[i*3+2]) * scale;
						src += size*3;	// skip to next lightmap
					}
					break;
				case LM_L8:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						scale = d_lightstylevalue[surf->styles[maps]];
						surf->cached_light[maps] = scale;	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						for (i=0 ; i<size ; i++)
							blocklights[i] += src[i] * scale;
						src += size;	// skip to next lightmap
					}
					break;
				}
			}
// add all the dynamic lights
			if (surf->dlightframe == r_dlightframecount)
				Surf_AddDynamicLights_Lum (surf);
		}

		Surf_StoreLightmap_Lum(dest, blocklights, smax, tmax, shift, stainsrc, lm->width);
	}
}

#if defined(THREADEDWORLD) && (defined(Q1BSPS)||defined(Q2BSPS))
static void Surf_BuildLightMap_Worker (model_t *wmodel, msurface_t *surf, int shift, int ambient, int *d_lightstylevalue)
{
	int			smax, tmax;
	int			t;
	int			i, j;
	size_t		size;
	lightmapinfo_t *lm = lightmap[surf->lightmaptexturenums[0]];
	qbyte		*src;
	unsigned	scalergb[3];
	unsigned	scale;
	int			maps;
	unsigned	*bl;
	qbyte		*dest;
	qbyte		*deluxedest;
	stmap		*stainsrc;
	glRect_t	*theRect;

	static size_t maxblocksize;
	static vec3_t *blocknormals;
	static unsigned int *blocklights;

	shift += 7; // increase to base value
	surf->cached_dlight = false;

	smax = (surf->extents[0]>>surf->lmshift)+1;
	tmax = (surf->extents[1]>>surf->lmshift)+1;
	size = (size_t)smax*tmax;
	src = surf->samples;

	if (size > maxblocksize)
	{	//fixme: fill in?
		maxblocksize = size;
		blocknormals = BZ_Realloc(blocknormals, maxblocksize * sizeof(*blocknormals));	//already a vector
		blocklights = BZ_Realloc(blocklights, maxblocksize * 3*sizeof(*blocklights));
	}

	dest = lm->lightmaps + (surf->light_t[0] * lm->width + surf->light_s[0]) * lm->pixbytes;
	if (!r_stains.value || !surf->stained)
		stainsrc = NULL;
	else
		stainsrc = lm->stainmaps + (surf->light_t[0] * lm->width + surf->light_s[0]) * 3;

	if (lm->hasdeluxe)
	{
		lightmapinfo_t *dlm = lightmap[surf->lightmaptexturenums[0]+1];
		deluxedest = dlm->lightmaps + (surf->light_t[0] * dlm->width + surf->light_s[0]) * dlm->pixbytes;

		Surf_BuildDeluxMap(wmodel, surf, deluxedest, lm, blocknormals);
	}

	if (lm->fmt != PTI_L8)
	{
		// set to full bright if no light data
		if (ambient < 0)
		{	//abslight for hexen2
			t = (-1-ambient)*255;
			for (i=0 ; i<size*3 ; i++)
			{
				blocklights[i] = t;
			}

			for (maps = 0 ; maps < MAXCPULIGHTMAPS ; maps++)
			{
				surf->cached_light[maps] = -1-ambient;
				surf->cached_colour[maps] = 0xff;
			}
		}
		else if (r_fullbright.value>0)
		{	//fullbright cheat
			for (i=0 ; i<size*3 ; i++)
			{
				blocklights[i] = r_fullbright.value*255*256;
			}
		}
		else if (!wmodel->lightdata)
		{	/*fullbright if map is not lit. but not overbright*/
			for (i=0 ; i<size*3 ; i++)
			{
				blocklights[i] = 128*256;
			}
		}
		else
		{
// clear to no light
			t = ambient;
			if (t == 0)
				memset(blocklights, 0, size*3*sizeof(*bl));
			else
			{
				for (i=0 ; i<size*3 ; i++)
				{
					blocklights[i] = t;
				}
			}

// add all the lightmaps
			if (src)
			{
				if (wmodel->fromgame == fg_quake3)	//rgb
				{
					/*q3 lightmaps are meant to be pre-built
					this code is misguided, and ought never be executed anyway.
					*/
					int pixbytes = lm->pixbytes;
					bl = blocklights;
					for (i = 0; i < tmax; i++)
					{
						for (j = 0; j < smax; j++)
						{
							bl[0]		= 255*src[(i*pixbytes+j)*3];
							bl[1]		= 255*src[(i*pixbytes+j)*3+1];
							bl[2]		= 255*src[(i*pixbytes+j)*3+2];
							bl+=3;
						}
					}
				}
				else switch(wmodel->lightmaps.fmt)
				{
				case LM_E5BGR9:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						surf->cached_light[maps] = scale = d_lightstylevalue[surf->styles[maps]];	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						if (scale)
						{
							VectorScale(cl_lightstyle[surf->styles[maps]].colours, scale, scalergb);
							for (i=0 ; i<size ; i++)
							{
								unsigned int l = ((unsigned int*)src)[i];
								float e = rgb9e5tab[l>>27]*(1u<<7);
								blocklights[i*3+0] += scalergb[0] * e * ((l>> 0)&0x1ff);
								blocklights[i*3+1] += scalergb[1] * e * ((l>> 9)&0x1ff);
								blocklights[i*3+2] += scalergb[2] * e * ((l>>18)&0x1ff);
							}
						}
						src += size*4;	// skip to next lightmap
					}
					break;
				case LM_RGB8:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						surf->cached_light[maps] = scale = d_lightstylevalue[surf->styles[maps]];
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						if (scale)
						{
							VectorScale(cl_lightstyle[surf->styles[maps]].colours, scale, scalergb);
							bl = blocklights;
							for (i=0 ; i<size ; i++)
							{
								*bl++		+=   *src++ * scalergb[0];
								*bl++		+=   *src++ * scalergb[1];
								*bl++		+=   *src++ * scalergb[2];
							}
						}
						else
							src += size*3;	// skip to next lightmap
					}
					break;

				case LM_L8:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ;
						 maps++)
					{
						surf->cached_light[maps] = scale = d_lightstylevalue[surf->styles[maps]];	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						if (scale)
						{
							VectorScale(cl_lightstyle[surf->styles[maps]].colours, scale, scalergb);
							bl = blocklights;
							for (i=0 ; i<size ; i++)
							{
								*bl++		+= *src * scalergb[0];
								*bl++		+= *src * scalergb[1];
								*bl++		+= *src * scalergb[2];
								src++;
							}
						}
						else
							src += size;	// skip to next lightmap
					}
					break;
				}
			}
		}

		if (!r_stains.value || !surf->stained)
			stainsrc = NULL;

		Surf_StoreLightmap_RGB(dest, blocklights, smax, tmax, shift, stainsrc, lm);
	}
	else
	{
	// set to full bright if no light data
		if (r_fullbright.ival)
		{
			for (i=0 ; i<size ; i++)
				blocklights[i] = 255*256;
		}
		else if (!wmodel->lightdata)
		{
			for (i=0 ; i<size*3 ; i++)
			{
				blocklights[i] = 255*256;
			}
			surf->cached_light[0] = d_lightstylevalue[0];
			surf->cached_colour[0] = cl_lightstyle[0].colourkey;
		}
		else
		{
// clear to no light
			for (i=0 ; i<size ; i++)
				blocklights[i] = ambient;

// add all the lightmaps
			if (src)
			{
				switch(wmodel->lightmaps.fmt)
				{
				case LM_E5BGR9:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						scale = d_lightstylevalue[surf->styles[maps]];
						surf->cached_light[maps] = scale;	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						if (scale)
							for (i=0 ; i<size ; i++)
							{
								unsigned int lm = ((unsigned int *)lightmap)[i];
								blocklights[i] += max3(((lm>>0)&0x1ff),((lm>>9)&0x1ff),((lm>>18)&0x1ff)) * scale * (rgb9e5tab[lm>>27]*(1<<7));
							}
						lightmap += size*4;	// skip to next lightmap
					}
					break;
				case LM_RGB8:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						scale = d_lightstylevalue[surf->styles[maps]];
						surf->cached_light[maps] = scale;	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						if (scale)
							for (i=0 ; i<size ; i++)
								blocklights[i] += max3(src[i*3],src[i*3+1],src[i*3+2]) * scale;
						src += size*3;	// skip to next lightmap
					}
					break;
				case LM_L8:
					for (maps = 0 ; maps < MAXCPULIGHTMAPS && surf->styles[maps] != INVALID_LIGHTSTYLE ; maps++)
					{
						scale = d_lightstylevalue[surf->styles[maps]];
						surf->cached_light[maps] = scale;	// 8.8 fraction
						surf->cached_colour[maps] = cl_lightstyle[surf->styles[maps]].colourkey;
						if (scale)
							for (i=0 ; i<size ; i++)
								blocklights[i] += src[i] * scale;
						src += size;	// skip to next lightmap
					}
					break;
				}
			}
		}

		Surf_StoreLightmap_Lum(dest, blocklights, smax, tmax, shift, stainsrc, lm->width);
	}

	//make sure we flag the output rect properly.
	theRect = &lm->rectchange;
	if (theRect->t > surf->light_t[0])
		theRect->t = surf->light_t[0];
	if (theRect->l > surf->light_s[0])
		theRect->l = surf->light_s[0];
	if (theRect->r < surf->light_s[0]+smax)
		theRect->r = surf->light_s[0]+smax;
	if (theRect->b < surf->light_t[0]+tmax)
		theRect->b = surf->light_t[0]+tmax;
	lm->modified = true;

	if (lm->hasdeluxe)
	{
		lightmapinfo_t *dlm = lm+1;
		theRect = &dlm->rectchange;
		if (theRect->t > surf->light_t[0])
			theRect->t = surf->light_t[0];
		if (theRect->l > surf->light_s[0])
			theRect->l = surf->light_s[0];
		if (theRect->r < surf->light_s[0]+smax)
			theRect->r = surf->light_s[0]+smax;
		if (theRect->b < surf->light_t[0]+tmax)
			theRect->b = surf->light_t[0]+tmax;
		dlm->modified = true;
	}
}
#endif

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

	BRUSH MODELS

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

/*
================
R_RenderDynamicLightmaps
Multitexture
================
*/
void Surf_RenderDynamicLightmaps (msurface_t *fa)
{
	int			maps;

	//surfaces without lightmaps
	if (fa->lightmaptexturenums[0]<0 || !lightmap)
		return;

	// check for lightmap modification
	if (!fa->samples)
	{
		if (fa->cached_light[0] != d_lightstylevalue[0]
			|| fa->cached_colour[0] != cl_lightstyle[0].colourkey)
			goto dynamic;
	}
	else
	{
		for (maps = 0 ; maps < MAXCPULIGHTMAPS && fa->styles[maps] != INVALID_LIGHTSTYLE ;
			 maps++)
			if (d_lightstylevalue[fa->styles[maps]] != fa->cached_light[maps]
				|| cl_lightstyle[fa->styles[maps]].colourkey != fa->cached_colour[maps])
				goto dynamic;
	}

	if (fa->dlightframe == r_dlightframecount	// dynamic this frame
		|| fa->cached_dlight)			// dynamic previously
	{
		RSpeedLocals();
dynamic:
		RSpeedRemark();

#ifdef _DEBUG
		if ((unsigned)fa->lightmaptexturenums[0] >= numlightmaps)
			Sys_Error("Invalid lightmap index\n");
#endif

		Surf_BuildLightMap (currentmodel, fa, 0, lightmap_shift, r_ambient.value*255, d_lightstylevalue);

		RSpeedEnd(RSPEED_DYNAMIC);
	}
}

#if defined(THREADEDWORLD) && (defined(Q1BSPS)||defined(Q2BSPS))
static void Surf_RenderDynamicLightmaps_Worker (model_t *wmodel, msurface_t *fa, int *d_lightstylevalue)
{
	int			maps;

	//surfaces without lightmaps
	if (fa->lightmaptexturenums[0]<0 || !lightmap)
		return;

	// check for lightmap modification
	if (!fa->samples)
	{
		if (fa->cached_light[0] != d_lightstylevalue[0]
			|| fa->cached_colour[0] != cl_lightstyle[0].colourkey)
			goto dynamic;
	}
	else
	{
		for (maps = 0 ; maps < MAXCPULIGHTMAPS && fa->styles[maps] != INVALID_LIGHTSTYLE ;
			 maps++)
			if (d_lightstylevalue[fa->styles[maps]] != fa->cached_light[maps]
				|| cl_lightstyle[fa->styles[maps]].colourkey != fa->cached_colour[maps])
				goto dynamic;
	}

	return;

dynamic:

#ifdef _DEBUG
	if ((unsigned)fa->lightmaptexturenums[0] >= numlightmaps)
		Sys_Error("Invalid lightmap index\n");
#endif


	Surf_BuildLightMap_Worker (wmodel, fa, lightmap_shift, r_ambient.value*255, d_lightstylevalue);
}
#endif //THREADEDWORLD

void Surf_RenderAmbientLightmaps (msurface_t *fa, int ambient)
{
	if (!fa->mesh)
		return;

	//surfaces without lightmaps
	if (fa->lightmaptexturenums[0]<0)
		return;

	if (fa->cached_light[0] != ambient || fa->cached_colour[0] != 0xff)
		goto dynamic;

	if (fa->dlightframe == r_dlightframecount	// dynamic this frame
		|| fa->cached_dlight)			// dynamic previously
	{
		RSpeedLocals();
dynamic:
		RSpeedRemark();

		Surf_BuildLightMap (currentmodel, fa, 0, lightmap_shift, -1-ambient, d_lightstylevalue);

		RSpeedEnd(RSPEED_DYNAMIC);
	}
}

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

	WORLD MODEL

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

#if 0
static qbyte *R_MarkLeafSurfaces_Q1 (void)
{
	qbyte	*vis;
	mleaf_t	*leaf;
	int		i, j;
	msurface_t *surf;
	int shift;

	vis = R_CalcVis_Q1();

	for (i=0 ; i<cl.worldmodel->numvisleafs ; i++)
	{
		if (vis[i>>3] & (1<<(i&7)))
		{
			leaf = (mleaf_t *)&cl.worldmodel->leafs[i+1];

			if (R_CullBox (leaf->minmaxs, leaf->minmaxs+3))
				continue;
			leaf->visframe = r_visframecount;

			for (j = 0; j < leaf->nummarksurfaces; j++)
			{
				surf = leaf->firstmarksurface[j];
				if (surf->visframe == r_visframecount)
					continue;
				surf->visframe = r_visframecount;

				*surf->mark = surf;
			}
		}
	}

	{
		texture_t *tex;

		shift = Surf_LightmapShift(cl.worldmodel);

		for (i = 0; i < cl.worldmodel->numtextures; i++)
		{
			tex = cl.worldmodel->textures[i];
			if (!tex)
				continue;
			for (j = 0; j < tex->vbo.meshcount; j++)
			{
				surf = tex->vbo.meshlist[j];
				if (surf)
				{
					Surf_RenderDynamicLightmaps (surf);

					tex->vbo.meshlist[j] = NULL;
					surf->sbatch->mesh[surf->sbatch->meshes++] = surf->mesh;
				}
			}
		}
	}
	return vis;
}
#endif

/*
static qbyte *Surf_MaskVis(qbyte *src, qbyte *dest)
{
	int i;
	if (cl.worldmodel->leafs[i].ma
}
*/
qbyte *frustumvis;

#ifdef Q1BSPS
/*
================
R_RecursiveWorldNode
================
*/
static void Surf_RecursiveWorldNode (mnode_t *node, unsigned int clipflags)
{
	int			c, side, clipped;
	mplane_t	*plane, *clipplane;
	msurface_t	*surf, **mark;
	mleaf_t		*pleaf;
	double		dot;

start:

	if (node->contents == Q1CONTENTS_SOLID)
		return;		// solid

	if (node->visframe != r_visframecount)
		return;

	for (c = 0, clipplane = r_refdef.frustum; c < r_refdef.frustum_numworldplanes; c++, clipplane++)
	{
		if (!(clipflags & (1 << c)))
			continue;	// don't need to clip against it

		clipped = BOX_ON_PLANE_SIDE (node->minmaxs, node->minmaxs + 3, clipplane);
		if (clipped == 2)
			return; 
		else if (clipped == 1)
			clipflags -= (1<<c);	// node is entirely on screen
	}

// if a leaf node, draw stuff
	if (node->contents < 0)
	{
		pleaf = (mleaf_t *)node;

		c = (pleaf - cl.worldmodel->leafs)-1;
		frustumvis[c>>3] |= 1<<(c&7);

		mark = pleaf->firstmarksurface;
		c = pleaf->nummarksurfaces;

		if (c)
		{
			do
			{
				(*mark++)->visframe = r_framecount;
			} while (--c);
		}
		return;
	}

// node is just a decision point, so go down the apropriate sides

// find which side of the node we are on
	plane = node->plane;

	switch (plane->type)
	{
	case PLANE_X:
		dot = modelorg[0] - plane->dist;
		break;
	case PLANE_Y:
		dot = modelorg[1] - plane->dist;
		break;
	case PLANE_Z:
		dot = modelorg[2] - plane->dist;
		break;
	default:
		dot = DotProduct (modelorg, plane->normal) - plane->dist;
		break;
	}

	if (dot >= 0)
		side = 0;
	else
		side = 1;

// recurse down the children, front side first
	Surf_RecursiveWorldNode (node->children[side], clipflags);

// draw stuff
	c = node->numsurfaces;

	if (c)
	{
		surf = cl.worldmodel->surfaces + node->firstsurface;

		if (dot < 0 -BACKFACE_EPSILON)
			side = SURF_PLANEBACK;
		else if (dot > BACKFACE_EPSILON)
			side = 0;
		{
			for ( ; c ; c--, surf++)
			{
				if (surf->visframe != r_framecount)
					continue;

				if (((dot < 0) ^ !!(surf->flags & SURF_PLANEBACK)))
					continue;		// wrong side

				Surf_RenderDynamicLightmaps (surf);
				surf->sbatch->mesh[surf->sbatch->meshes++] = surf->mesh;
			}
		}
	}

// recurse down the back side
	//GLR_RecursiveWorldNode (node->children[!side], clipflags);
	node = node->children[!side];
	goto start;
}

static void Surf_OrthoRecursiveWorldNode (mnode_t *node, unsigned int clipflags)
{
	//when rendering as ortho the front and back sides are technically equal. the only culling comes from frustum culling.

	int			c, clipped;
	mplane_t	*clipplane;
	msurface_t	*surf, **mark;
	mleaf_t		*pleaf;

	if (node->contents == Q1CONTENTS_SOLID)
		return;		// solid

	if (node->visframe != r_visframecount)
		return;

	for (c = 0, clipplane = r_refdef.frustum; c < r_refdef.frustum_numworldplanes; c++, clipplane++)
	{
		if (!(clipflags & (1 << c)))
			continue;	// don't need to clip against it

		clipped = BOX_ON_PLANE_SIDE (node->minmaxs, node->minmaxs + 3, clipplane);
		if (clipped == 2)
			return;
		else if (clipped == 1)
			clipflags -= (1<<c);	// node is entirely on screen
	}

// if a leaf node, draw stuff
	if (node->contents < 0)
	{
		pleaf = (mleaf_t *)node;

		mark = pleaf->firstmarksurface;
		c = pleaf->nummarksurfaces;

		if (c)
		{
			do
			{
				(*mark++)->visframe = r_framecount;
			} while (--c);
		}
		return;
	}

// recurse down the children
	Surf_OrthoRecursiveWorldNode (node->children[0], clipflags);
	Surf_OrthoRecursiveWorldNode (node->children[1], clipflags);

// draw stuff
  	c = node->numsurfaces;

	if (c)
	{
		surf = cl.worldmodel->surfaces + node->firstsurface;

		for ( ; c ; c--, surf++)
		{
			if (surf->visframe != r_framecount)
				continue;

			Surf_RenderDynamicLightmaps (surf);
			surf->sbatch->mesh[surf->sbatch->meshes++] = surf->mesh;
		}
	}
	return;
}
#endif

#ifdef Q2BSPS
static void Surf_RecursiveQ2WorldNode (mnode_t *node)
{
	int			c, side;
	mplane_t	*plane;
	msurface_t	*surf, **mark;
	mleaf_t		*pleaf;
	double		dot;

	int sidebit;

	if (node->contents == Q2CONTENTS_SOLID)
		return;		// solid

	if (node->visframe != r_visframecount)
		return;
	if (R_CullBox (node->minmaxs, node->minmaxs+3))
		return;

// if a leaf node, draw stuff
	if (node->contents != -1)
	{
		pleaf = (mleaf_t *)node;

		// check for door connected areas
		if (! (r_refdef.areabits[pleaf->area>>3] & (1<<(pleaf->area&7)) ) )
			return;		// not visible

		c = pleaf->cluster;
		if (c >= 0)
			frustumvis[c>>3] |= 1<<(c&7);

		mark = pleaf->firstmarksurface;
		c = pleaf->nummarksurfaces;

		if (c)
		{
			do
			{
				(*mark)->visframe = r_framecount;
				mark++;
			} while (--c);
		}
		return;
	}

// node is just a decision point, so go down the apropriate sides

// find which side of the node we are on
	plane = node->plane;

	switch (plane->type)
	{
	case PLANE_X:
		dot = modelorg[0] - plane->dist;
		break;
	case PLANE_Y:
		dot = modelorg[1] - plane->dist;
		break;
	case PLANE_Z:
		dot = modelorg[2] - plane->dist;
		break;
	default:
		dot = DotProduct (modelorg, plane->normal) - plane->dist;
		break;
	}

	if (dot >= 0)
	{
		side = 0;
		sidebit = 0;
	}
	else
	{
		side = 1;
		sidebit = SURF_PLANEBACK;
	}

// recurse down the children, front side first
	Surf_RecursiveQ2WorldNode (node->children[side]);

	// draw stuff
	for ( c = node->numsurfaces, surf = currentmodel->surfaces + node->firstsurface; c ; c--, surf++)
	{
		if (surf->visframe != r_framecount)
			continue;

		if ( (surf->flags & SURF_PLANEBACK) != sidebit )
			continue;		// wrong side

		surf->visframe = 0;//r_framecount+1;//-1;

		Surf_RenderDynamicLightmaps (surf);

		surf->sbatch->mesh[surf->sbatch->meshes++] = surf->mesh;
	}


// recurse down the back side
	Surf_RecursiveQ2WorldNode (node->children[!side]);
}
#endif

#ifdef Q3BSPS
#if 0
static void Surf_LeafWorldNode (void)
{
	int			i;
	int			clipflags;
	msurface_t	**mark, *surf;
	mleaf_t		*pleaf;


	int clipped;
	mplane_t *clipplane;


	for (pleaf = r_vischain; pleaf; pleaf = pleaf->vischain)
	{
		// check for door connected areas
//		if (areabits)
		{
//			if (!(areabits[pleaf->area>>3] & (1<<(pleaf->area&7))))
//			{
//				continue;		// not visible
//			}
		}

		clipflags = 15;		// 1 | 2 | 4 | 8
//		if (!r_nocull->value)
		{

			for (i=0,clipplane=frustum ; i<FRUSTUMPLANES ; i++,clipplane++)
			{
				clipped = BoxOnPlaneSide (pleaf->minmaxs, pleaf->minmaxs+3, clipplane);
				if (clipped == 2)
				{
					break;
				}
				else if (clipped == 1)
				{
					clipflags &= ~(1<<i);	// node is entirely on screen
				}
			}

			if (i != FRUSTUMPLANES)
			{
				continue;
			}
		}

		i = pleaf->nummarksurfaces;
		mark = pleaf->firstmarksurface;

		do
		{
			surf = *mark++;
			if (surf->visframe != r_framecount)	//sufraces exist in multiple leafs.
			{
				surf->visframe = r_framecount;
				if (surf->mark)
					*surf->mark = surf;
			}
		} while (--i);

//		c_world_leafs++;
	}



	{
		int j;
		texture_t *tex;
		for (i = 0; i < cl.worldmodel->numtextures; i++)
		{
			tex = cl.worldmodel->textures[i];
			if (!tex)
				continue;
			for (j = 0; j < tex->vbo.meshcount; j++)
			{
				surf = tex->vbo.meshlist[j];
				if (surf)
				{
					tex->vbo.meshlist[j] = NULL;
					surf->sbatch->mesh[surf->sbatch->meshes++] = surf->mesh;
				}
			}
		}
	}
}
#endif

static void Surf_RecursiveQ3WorldNode (mnode_t *node, unsigned int clipflags)
{
	int			c, side, clipped;
	mplane_t	*plane, *clipplane;
	msurface_t	*surf, **mark;
	mleaf_t		*pleaf;
	double		dot;

start:

	if (node->visframe != r_visframecount)
		return;

	for (c = 0, clipplane = r_refdef.frustum; c < r_refdef.frustum_numworldplanes; c++, clipplane++)
	{
		if (!(clipflags & (1 << c)))
			continue;	// don't need to clip against it

		clipped = BOX_ON_PLANE_SIDE (node->minmaxs, node->minmaxs + 3, clipplane);
		if (clipped == 2)
			return;
		else if (clipped == 1)
			clipflags -= (1<<c);	// node is entirely on screen
	}

// if a leaf node, draw stuff
	if (node->contents != -1)
	{
		pleaf = (mleaf_t *)node;

		if (! (r_refdef.areabits[pleaf->area>>3] & (1<<(pleaf->area&7)) ) )
			return;		// not visible

		c = pleaf->cluster;
		if (c >= 0)
			frustumvis[c>>3] |= 1<<(c&7);

		mark = pleaf->firstmarksurface;
		for (c = pleaf->nummarksurfaces; c; c--)
		{
			surf = *mark++;
			if (surf->visframe == r_framecount)
				continue;
			surf->visframe = r_framecount;

//			if (((dot < 0) ^ !!(surf->flags & SURF_PLANEBACK)))
//				continue;		// wrong side

			surf->sbatch->mesh[surf->sbatch->meshes++] = surf->mesh;
		}
		return;
	}

// node is just a decision point, so go down the apropriate sides

// find which side of the node we are on
	plane = node->plane;

	switch (plane->type)
	{
	case PLANE_X:
		dot = modelorg[0] - plane->dist;
		break;
	case PLANE_Y:
		dot = modelorg[1] - plane->dist;
		break;
	case PLANE_Z:
		dot = modelorg[2] - plane->dist;
		break;
	default:
		dot = DotProduct (modelorg, plane->normal) - plane->dist;
		break;
	}

	if (dot >= 0)
		side = 0;
	else
		side = 1;

// recurse down the children, front side first
	Surf_RecursiveQ3WorldNode (node->children[side], clipflags);

// q3 nodes contain no drawables

// recurse down the back side
	//GLR_RecursiveWorldNode (node->children[!side], clipflags);
	node = node->children[!side];
	goto start;
}
#endif

static void Surf_PushChains(batch_t **batches)
{
	batch_t *batch;
	int i;

	if (r_refdef.recurse == R_MAX_RECURSE)
		Sys_Error("Recursed too deep\n");

	if (!r_refdef.recurse)
	{
		for (i = 0; i < SHADER_SORT_COUNT; i++)
		for (batch = batches[i]; batch; batch = batch->next)
		{
			batch->firstmesh = 0;
		}
	}
#if R_MAX_RECURSE > 2
	else if (r_refdef.recurse > 1)
	{
		for (i = 0; i < SHADER_SORT_COUNT; i++)
		for (batch = batches[i]; batch; batch = batch->next)
		{
			batch->recursefirst[r_refdef.recurse] = batch->firstmesh;
			batch->firstmesh = batch->meshes;
		}
	}
#endif
	else
	{
		for (i = 0; i < SHADER_SORT_COUNT; i++)
		for (batch = batches[i]; batch; batch = batch->next)
		{
			batch->firstmesh = batch->meshes;
		}
	}
}
static void Surf_PopChains(batch_t **batches)
{
	batch_t *batch;
	int i;

	if (!r_refdef.recurse)
	{
		for (i = 0; i < SHADER_SORT_COUNT; i++)
		for (batch = batches[i]; batch; batch = batch->next)
		{
			batch->meshes = 0;
		}
	}
#if R_MAX_RECURSE > 2
	else if (r_refdef.recurse > 1)
	{
		for (i = 0; i < SHADER_SORT_COUNT; i++)
		for (batch = batches[i]; batch; batch = batch->next)
		{
			batch->meshes = batch->firstmesh;
			batch->firstmesh = batch->recursefirst[r_refdef.recurse];
		}
	}
#endif
	else
	{
		for (i = 0; i < SHADER_SORT_COUNT; i++)
		for (batch = batches[i]; batch; batch = batch->next)
		{
			batch->meshes = batch->firstmesh;
			batch->firstmesh = 0;
		}
	}
}

//most of this is a direct copy from gl
void Surf_SetupFrame(void)
{
	mleaf_t	*leaf;
	vec3_t	temp, pvsorg;
	int viewcontents;

	if (!cl.worldmodel || cl.worldmodel->loadstate!=MLS_LOADED)
		r_refdef.flags |= RDF_NOWORLDMODEL;

	R_AnimateLight();
	r_framecount++;

	if (r_refdef.recurse)
	{
		VectorCopy(r_refdef.pvsorigin, pvsorg);
	}
	else
	{
		VectorCopy(r_refdef.vieworg, pvsorg);
		R_UpdateHDR(r_refdef.vieworg);
	}

	r_viewarea = 0;
	viewcontents = 0;
	if (r_refdef.flags & RDF_NOWORLDMODEL)
	{
	}
	else if (!cl.worldmodel || cl.worldmodel->loadstate != MLS_LOADED || cl.worldmodel->fromgame == fg_doom3 )
	{
		r_viewcluster = -1;
		r_viewcluster2 = -1;
	}
#if defined(Q2BSPS) || defined(Q3BSPS)
	else if (cl.worldmodel->fromgame == fg_quake2 || cl.worldmodel->fromgame == fg_quake3)
	{
		leaf = Mod_PointInLeaf (cl.worldmodel, pvsorg);
		r_viewarea = leaf->area;
		viewcontents = cl.worldmodel->funcs.PointContents(cl.worldmodel, NULL, pvsorg);
		r_viewcluster = r_viewcluster2 = leaf->cluster;

		// check above and below so crossing solid water doesn't draw wrong
		if (!leaf->contents)
		{	// look down a bit
			vec3_t	temp;

			VectorCopy (pvsorg, temp);
			temp[2] -= 16;
			leaf = Mod_PointInLeaf (cl.worldmodel, temp);
			if ( !(leaf->contents & Q2CONTENTS_SOLID) &&
				(leaf->cluster != r_viewcluster2) )
				r_viewcluster2 = leaf->cluster;
		}
		else
		{	// look up a bit
			vec3_t	temp;

			VectorCopy (pvsorg, temp);
			temp[2] += 16;
			leaf = Mod_PointInLeaf (cl.worldmodel, temp);
			if ( !(leaf->contents & Q2CONTENTS_SOLID) &&
				(leaf->cluster != r_viewcluster2) )
				r_viewcluster2 = leaf->cluster;
		}
	}
#endif
	else
	{
		leaf = Mod_PointInLeaf (cl.worldmodel, pvsorg);
		r_viewcluster = (leaf - cl.worldmodel->leafs)-1;
		r_viewcluster2 = -1;
		if (leaf)
		{
			switch(leaf->contents)
			{
			case Q1CONTENTS_WATER:
				viewcontents |= FTECONTENTS_WATER;
				break;
			case Q1CONTENTS_LAVA:
				viewcontents |= FTECONTENTS_LAVA;
				break;
			case Q1CONTENTS_SLIME:
				viewcontents |= FTECONTENTS_SLIME;
				break;
			case Q1CONTENTS_SKY:
				viewcontents |= FTECONTENTS_SKY;
				break;
			case Q1CONTENTS_SOLID:
				viewcontents |= FTECONTENTS_SOLID;
				break;
			case Q1CONTENTS_LADDER:
				viewcontents |= FTECONTENTS_LADDER;
				break;
			}

			if (leaf->contents == Q1CONTENTS_EMPTY)
			{	//look down a bit
				VectorCopy (pvsorg, temp);
				temp[2] -= 16;
				leaf = Mod_PointInLeaf (cl.worldmodel, temp);
				if (leaf->contents <= Q1CONTENTS_WATER && leaf->contents >= Q1CONTENTS_LAVA)
					r_viewcluster2 = (leaf - cl.worldmodel->leafs)-1;
			}
			else if (leaf->contents <= Q1CONTENTS_WATER && leaf->contents >= Q1CONTENTS_LAVA)
			{	//in water, look up a bit.

				VectorCopy (pvsorg, temp);
				temp[2] += 16;
				leaf = Mod_PointInLeaf (cl.worldmodel, temp);
				if (leaf->contents == Q1CONTENTS_EMPTY)
					r_viewcluster2 = (leaf - cl.worldmodel->leafs)-1;
			}
		}
	}

#ifdef TERRAIN
	if (!(r_refdef.flags & RDF_NOWORLDMODEL) && cl.worldmodel && cl.worldmodel->terrain)
	{
		viewcontents |= Heightmap_PointContents(cl.worldmodel, NULL, pvsorg);
	}
#endif

	/*pick up any extra water entities*/
	{
		vec3_t t1,t2;
		VectorCopy(pmove.player_mins, t1);
		VectorCopy(pmove.player_maxs, t2);
		VectorClear(pmove.player_maxs);
		VectorClear(pmove.player_mins);
		viewcontents |= PM_ExtraBoxContents(pvsorg);
		VectorCopy(t1, pmove.player_mins);
		VectorCopy(t2, pmove.player_maxs);
	}
	if (!r_refdef.recurse)
	{
		r_viewcontents = viewcontents;
		if (!r_secondaryview)
			V_SetContentsColor (viewcontents);
	}


	if (r_refdef.playerview->audio.defaulted)
	{
		//first scene is the 'main' scene and audio defaults to that (unless overridden later in the frame)
		r_refdef.playerview->audio.defaulted = false;
		r_refdef.playerview->audio.entnum = r_refdef.playerview->viewentity;
		VectorCopy(r_refdef.vieworg, r_refdef.playerview->audio.origin);
		AngleVectors(r_refdef.viewangles, r_refdef.playerview->audio.forward,r_refdef.playerview->audio.right, r_refdef.playerview->audio.up);
//		I'm fed up of openal users getting audio bugs when underwater.
//		if (r_viewcontents & FTECONTENTS_FLUID)
//			r_refdef.playerview->audio.reverbtype = 1;
//		else
			r_refdef.playerview->audio.reverbtype = 0;
		VectorCopy(r_refdef.playerview->simvel, r_refdef.playerview->audio.velocity);
	}
}

/*
static mesh_t *surfbatchmeshes[256];
static void Surf_BuildBrushBatch(batch_t *batch)
{
	model_t *model = batch->ent->model;
	unsigned int i;
	batch->mesh = surfbatchmeshes;
	batch->meshes = batch->surf_count;
	for (i = 0; i < batch->surf_count; i++)
	{
		surfbatchmeshes[i] = model->surfaces[batch->surf_first + i].mesh;
	}
}
*/

void Surf_GenBrushBatches(batch_t **batches, entity_t *ent)
{
	int i;
	msurface_t *s;
	batch_t *ob;
	model_t *model;
	batch_t *b;
	unsigned int bef;

	model = ent->model;

	if (R_CullEntityBox (ent, model->mins, model->maxs))
		return;

#ifdef RTLIGHTS
	if (BE_LightCullModel(ent->origin, model))
		return;
#endif

// calculate dynamic lighting for bmodel if it's not an
// instanced model
	if (model->fromgame != fg_quake3 && model->fromgame != fg_doom3 && lightmap && webo_blocklightmapupdates!=3)
	{
		int k;

		currententity = ent;
		currentmodel = ent->model;
		if (model->nummodelsurfaces != 0 && r_dynamic.ival > 0)
		{
			for (k=rtlights_first; k<RTL_FIRST; k++)
			{
				if (!cl_dlights[k].radius)
					continue;
				if (!(cl_dlights[k].flags & LFLAG_LIGHTMAP))
					continue;

				model->funcs.MarkLights (&cl_dlights[k], 1<<k, model->rootnode);
			}
		}

		Surf_LightmapShift(model);
#ifdef HEXEN2
		if ((ent->drawflags & MLS_MASK) == MLS_ABSLIGHT)
		{
			//update lightmaps.
			for (s = model->surfaces+model->firstmodelsurface,i = 0; i < model->nummodelsurfaces; i++, s++)
				Surf_RenderAmbientLightmaps (s, ent->abslight);
		}
		else if (ent->drawflags & DRF_TRANSLUCENT)
		{
			//update lightmaps.
			for (s = model->surfaces+model->firstmodelsurface,i = 0; i < model->nummodelsurfaces; i++, s++)
				Surf_RenderAmbientLightmaps (s, 255);
		}
		else
#endif
		{
			//update lightmaps.
			for (s = model->surfaces+model->firstmodelsurface,i = 0; i < model->nummodelsurfaces; i++, s++)
				Surf_RenderDynamicLightmaps (s);
		}
		currententity = NULL;
	}

#ifdef BEF_PUSHDEPTH
	if (r_pushdepth)
		bef = BEF_PUSHDEPTH;
	else
		bef = 0;
#else
	bef = 0;
#endif
	if (ent->flags & RF_ADDITIVE)
		bef |= BEF_FORCEADDITIVE;
#ifdef HEXEN2
	else if ((ent->drawflags & DRF_TRANSLUCENT) && r_wateralpha.value != 1)
	{
		bef |= BEF_FORCETRANSPARENT;
		ent->shaderRGBAf[3] = r_wateralpha.value;
	}
#endif
	else if ((ent->flags & RF_TRANSLUCENT) && cls.protocol != CP_QUAKE3)
		bef |= BEF_FORCETRANSPARENT;
	if (ent->flags & RF_NODEPTHTEST)
		bef |= BEF_FORCENODEPTH;
	if (ent->flags & RF_NOSHADOW)
		bef |= BEF_NOSHADOWS;

	for (i = 0; i < SHADER_SORT_COUNT; i++)
	for (ob = model->batches[i]; ob; ob = ob->next)
	{
		b = BE_GetTempBatch();
		if (!b)
			continue;
		*b = *ob;
		if (b->vbo && b->maxmeshes)
		{
			b->user.meshbuf = *b->mesh[0];
			b->user.meshbuf.numindexes = b->mesh[b->maxmeshes-1]->indexes+b->mesh[b->maxmeshes-1]->numindexes-b->mesh[0]->indexes;
			b->user.meshbuf.numvertexes = b->mesh[b->maxmeshes-1]->xyz_array+b->mesh[b->maxmeshes-1]->numvertexes-b->mesh[0]->xyz_array;

			b->mesh = &b->user.meshptr;
			b->user.meshptr = &b->user.meshbuf;
			b->meshes = b->maxmeshes = 1;
		}
		else
		{
//		if (b->texture)
//			b->shader = R_TextureAnimation(ent->framestate.g[FS_REG].frame[0], b->texture)->shader;
			b->meshes = b->maxmeshes;
		}
		b->ent = ent;
		b->flags = bef;

		if (b->buildmeshes)
			b->buildmeshes(b);

		if (!b->shader)
			b->shader = R_TextureAnimation(ent->framestate.g[FS_REG].frame[0], b->texture)->shader;

		if (bef & BEF_FORCEADDITIVE && b->shader->sort==SHADER_SORT_OPAQUE)
		{
			b->next = batches[SHADER_SORT_ADDITIVE];
			batches[SHADER_SORT_ADDITIVE] = b;
		}
		else if (bef & BEF_FORCETRANSPARENT && b->shader->sort==SHADER_SORT_OPAQUE)
		{
			b->next = batches[SHADER_SORT_BLEND];
			batches[SHADER_SORT_BLEND] = b;
		}
		else
		{
			b->next = batches[b->shader->sort];
			batches[b->shader->sort] = b;
		}
	}
}

#ifdef THREADEDWORLD
struct webostate_s
{
	char dbgid[12];
	struct webostate_s *next;
	int lastvalid;	//keyed to cls.framecount, for cleaning up.
	model_t *wmodel;
	int framecount;
	int cluster[2];
	qboolean generating;
	pvsbuffer_t pvs;
	vboarray_t ebo;
	vboarray_t vbo;
	void *ebomem;
	size_t idxcount;
	int numbatches;
	int lightstylevalues[MAX_NET_LIGHTSTYLES];	//when using workers that only reprocessing lighting at 10fps, things get too ugly when things go out of sync

//TODO	qbyte *bakedsubmodels;	//flags saying whether each submodel was baked or not. baked submodels need to be untinted uncaled unrotated at origin etc

	vec3_t lastpos;	//for better stale ebo selection when we're generating a new position.

	batch_t *rbatches[SHADER_SORT_COUNT];

	struct wesbatch_s
	{
		qboolean inefficient;	//this batch's shader needs special care with vertex data too
		size_t numidx;
		size_t maxidx;
		size_t firstidx;	//offset into the final ebo
		index_t *idxbuffer;
		batch_t b;
		mesh_t m;
		mesh_t *pm;
		vbo_t vbo;

		size_t maxverts;
	} batches[1];
};
static struct webostate_s *webostates;
static struct webostate_s *webogenerating;
static int webogeneratingstate;	//1 if generating, 0 if not, for waiting for sync.
static void R_DestroyWorldEBO(struct webostate_s *es)
{
	int i;
	if (!es)
		return;

	for (i = 0; i < es->numbatches; i++)
	{
		if (es->batches[i].inefficient)
		{
			BZ_Free(es->batches[i].m.xyz_array);
			BZ_Free(es->batches[i].m.st_array);
			BZ_Free(es->batches[i].m.lmst_array[0]);
			BZ_Free(es->batches[i].m.normals_array);
			BZ_Free(es->batches[i].m.snormals_array);
			BZ_Free(es->batches[i].m.tnormals_array);
		}
		BZ_Free(es->batches[i].idxbuffer);
	}

#ifdef GLQUAKE
	if (qrenderer == QR_OPENGL)
	{
		if (es->ebo.gl.vbo)
			qglDeleteBuffersARB(1, &es->ebo.gl.vbo);
		if (es->vbo.gl.vbo)
			qglDeleteBuffersARB(1, &es->vbo.gl.vbo);
	}
#endif
#ifdef VKQUAKE
	if (qrenderer == QR_VULKAN)
		BE_VBO_Destroy(&es->ebo, es->ebomem);
#endif
	BZ_Free(es);
}
void R_GeneratedWorldEBO(void *ctx, void *data, size_t a_, size_t b_)
{
	size_t idxcount, vertcount;
	unsigned int i;
	model_t *mod;
	batch_t *b, *batch;
	mesh_t *m;
	int sortid;
	struct webostate_s *webostate = ctx;
	webostate->next = webostates;
	webostates = webostate;
	webogenerating = NULL;
	webogeneratingstate = 0;
	webo_blocklightmapupdates = 1;
	mod = webostate->wmodel;

	webostate->lastvalid = cls.framecount;

	for (i = 0, idxcount = 0, vertcount = 0; i < webostate->numbatches; i++)
	{
		idxcount += webostate->batches[i].numidx;
		vertcount += webostate->batches[i].m.numvertexes;
	}
#ifdef GLQUAKE
	if (qrenderer == QR_OPENGL)
	{
		GL_DeselectVAO();

		if (vertcount)
		{
			size_t vc;
			vbo_t *vbo;
			size_t v_coord	= 0;
			size_t v_tc		= v_coord	+ sizeof(vecV_t)*vertcount;
			size_t v_lmtc	= v_tc		+ sizeof(vec2_t)*vertcount;
			size_t v_norm	= v_lmtc	+ sizeof(vec2_t)*vertcount;
			size_t v_snorm	= v_norm	+ sizeof(vec3_t)*vertcount;
			size_t v_tnorm	= v_snorm	+ sizeof(vec3_t)*vertcount;
			size_t v_colour	= v_tnorm	+ sizeof(vec3_t)*vertcount;
			size_t vbosize	= v_colour	+ sizeof(vec4_t)*vertcount;

			if (!webostate->vbo.gl.vbo)
				qglGenBuffersARB(1, &webostate->vbo.gl.vbo);
			GL_SelectVBO(webostate->vbo.gl.vbo);
			qglBufferDataARB(GL_ARRAY_BUFFER_ARB, vbosize, NULL, GL_STATIC_DRAW_ARB);
			for (i = 0, vertcount = 0; i < webostate->numbatches; i++)
			{
				if (webostate->batches[i].inefficient)
				{
					vc = webostate->batches[i].m.numvertexes;

					vbo = &webostate->batches[i].vbo;
					vbo->coord.gl.vbo		= webostate->vbo.gl.vbo;	vbo->coord.gl.addr		= (char*)v_coord	+ sizeof(vecV_t)*vertcount;
					vbo->texcoord.gl.vbo	= webostate->vbo.gl.vbo;	vbo->texcoord.gl.addr	= (char*)v_tc		+ sizeof(vec2_t)*vertcount;
					vbo->lmcoord[0].gl.vbo	= webostate->vbo.gl.vbo;	vbo->lmcoord[0].gl.addr = (char*)v_lmtc		+ sizeof(vec2_t)*vertcount;
					vbo->normals.gl.vbo		= webostate->vbo.gl.vbo;	vbo->normals.gl.addr	= (char*)v_norm		+ sizeof(vec3_t)*vertcount;
					vbo->svector.gl.vbo		= webostate->vbo.gl.vbo;	vbo->svector.gl.addr	= (char*)v_snorm	+ sizeof(vec3_t)*vertcount;
					vbo->tvector.gl.vbo		= webostate->vbo.gl.vbo;	vbo->tvector.gl.addr	= (char*)v_tnorm	+ sizeof(vec3_t)*vertcount;
					vbo->colours[0].gl.vbo	= webostate->vbo.gl.vbo;	vbo->colours[0].gl.addr	= (char*)v_colour	+ sizeof(vec4_t)*vertcount;

					qglBufferSubDataARB(GL_ARRAY_BUFFER_ARB,(qintptr_t)vbo->coord.gl.addr,		vc*sizeof(vecV_t), webostate->batches[i].m.xyz_array);
					qglBufferSubDataARB(GL_ARRAY_BUFFER_ARB,(qintptr_t)vbo->texcoord.gl.addr,	vc*sizeof(vec2_t), webostate->batches[i].m.st_array);
					qglBufferSubDataARB(GL_ARRAY_BUFFER_ARB,(qintptr_t)vbo->lmcoord[0].gl.addr,	vc*sizeof(vec2_t), webostate->batches[i].m.lmst_array[0]);
					qglBufferSubDataARB(GL_ARRAY_BUFFER_ARB,(qintptr_t)vbo->normals.gl.addr,	vc*sizeof(vec3_t), webostate->batches[i].m.normals_array);
					qglBufferSubDataARB(GL_ARRAY_BUFFER_ARB,(qintptr_t)vbo->svector.gl.addr,	vc*sizeof(vec3_t), webostate->batches[i].m.snormals_array);
					qglBufferSubDataARB(GL_ARRAY_BUFFER_ARB,(qintptr_t)vbo->tvector.gl.addr,	vc*sizeof(vec3_t), webostate->batches[i].m.tnormals_array);
					qglBufferSubDataARB(GL_ARRAY_BUFFER_ARB,(qintptr_t)vbo->colours[0].gl.addr,	vc*sizeof(vec4_t), webostate->batches[i].m.colors4f_array[0]);
					webostate->batches[i].m.vbofirstvert = 0;
					vertcount += vc;
				}
			}
		}

		webostate->ebo.gl.addr = NULL;
		if (!webostate->ebo.gl.vbo)
			qglGenBuffersARB(1, &webostate->ebo.gl.vbo);
		GL_SelectEBO(webostate->ebo.gl.vbo);
		qglBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, idxcount*sizeof(index_t), NULL, GL_STATIC_DRAW_ARB);
		for (i = 0, idxcount = 0; i < webostate->numbatches; i++)
		{
			qglBufferSubDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, idxcount*sizeof(index_t), webostate->batches[i].numidx*sizeof(index_t), webostate->batches[i].idxbuffer);
//			BZ_Free(webostate->batches[i].idxbuffer);
//			webostate->batches[i].idxbuffer = NULL;
			webostate->batches[i].firstidx = idxcount;
			idxcount += webostate->batches[i].numidx;
		}
	}
#endif
#ifdef VKQUAKE
	if (qrenderer == QR_VULKAN)
	{	//this malloc is stupid.
		//with vulkan we really should be doing this on the worker instead, at least the staging part.
		index_t *indexes = malloc(sizeof(*indexes) * idxcount);
		BE_VBO_Destroy(&webostate->ebo, webostate->ebomem);
		memset(&webostate->ebo, 0, sizeof(webostate->ebo));
		webostate->ebomem = NULL;
		webostate->ebo.vk.offs = 0;
		for (i = 0, idxcount = 0; i < webostate->numbatches; i++)
		{
			memcpy(indexes + idxcount, webostate->batches[i].idxbuffer, webostate->batches[i].numidx*sizeof(index_t));
//			BZ_Free(webostate->batches[i].idxbuffer);
//			webostate->batches[i].idxbuffer = NULL;
			webostate->batches[i].firstidx = idxcount;
			idxcount += webostate->batches[i].numidx;
		}
		if (idxcount)
			BE_VBO_Finish(NULL, indexes, sizeof(*indexes) * idxcount, &webostate->ebo, NULL, &webostate->ebomem);
		else
		{
			memset(&webostate->ebo, 0, sizeof(webostate->ebo));
			webostate->ebomem = NULL;
		}
		free(indexes);

		vertcount = 0; //unsupported for now.
	}
#endif

	//should be doing this on the worker, but whatever
	for (i = 0, sortid = 0; sortid < SHADER_SORT_COUNT; sortid++)
	{
		webostate->rbatches[sortid] = NULL;
		for (batch = mod->batches[sortid]; batch != NULL; batch = batch->next, i++)
		{
			if (!webostate->batches[i].numidx)
				continue;

			if (batch->shader->flags & SHADER_NODRAW)
				continue;

			m = &webostate->batches[i].m;
			webostate->batches[i].pm = m;
			b = &webostate->batches[i].b;
			memcpy(b, batch, sizeof(*b));

			b->mesh = &webostate->batches[i].pm;
			b->meshes = 1;
			b->vbo = &webostate->batches[i].vbo;
			if (webostate->batches[i].inefficient)
			{	//we had to generate new buffers because there's something evil in the shader..
				m->indexes = webostate->batches[i].idxbuffer;
				b->vbo->vao = 0;
			}
			else
			{
				*b->vbo = *batch->vbo;
				if (b->shader->flags & SHADER_NEEDSARRAYS)
				{	//this ebo cache stuff tracks only indexes, we don't know the actual surfs any more.
					//if NEEDSARRAYS is flagged then the cpu will need access to the mesh data - which it doesn't have.
					//while we could figure out this info, there would be a lot of vertexes that are not referenced, which would be horrendously slow.
					if (b->shader->flags & SHADER_SKY)
						continue;
					b->shader = R_RegisterShader_Vertex(mod, "unsupported");
				}
				m->numvertexes = webostate->batches[i].b.vbo->vertcount;
			}
			b->vbo->indicies = webostate->ebo;
			b->vbo->vao = 0;
			m->numindexes = webostate->batches[i].numidx;
			m->vbofirstelement = webostate->batches[i].firstidx;


			b->next = webostate->rbatches[sortid];
			webostate->rbatches[sortid] = b;
		}
	}
}
#ifdef Q1BSPS
static void Surf_SimpleWorld_Q1BSP(struct webostate_s *es, qbyte *pvs)
{
	mleaf_t		*leaf;
	msurface_t	*surf, **mark, **end;
	mesh_t		*mesh;
	model_t *wmodel = es->wmodel;
	int l = wmodel->numclusters;
	int fc = -r_framecount;
	int i;
//	int s, f, lastface;
	struct wesbatch_s *eb;
	for (leaf = wmodel->leafs+l; l-- > 0; leaf--)
	{
		if ((pvs[l>>3] & (1u<<(l&7))) && leaf->nummarksurfaces)
		{
			mark = leaf->firstmarksurface;
			end = mark+leaf->nummarksurfaces;
			while(mark < end)
			{
				surf = *mark++;
				if (surf->visframe != fc)
				{
					surf->visframe = fc;
					Surf_RenderDynamicLightmaps_Worker (wmodel, surf, es->lightstylevalues);

					mesh = surf->mesh;
					eb = &es->batches[surf->sbatch->user.bmodel.ebobatch];
					if (eb->maxidx < eb->numidx + mesh->numindexes)
					{
						//FIXME: pre-allocate
						eb->maxidx = eb->numidx + mesh->numindexes + 512;
						eb->idxbuffer = BZ_Realloc(eb->idxbuffer, eb->maxidx * sizeof(index_t));
					}

					if (eb->inefficient)
					{	//slow path that needs to create new VBOs on the fly too.
						if (eb->maxverts < eb->m.numvertexes + mesh->numvertexes)
						{
							//FIXME: pre-allocate
							eb->maxverts = eb->m.numvertexes + mesh->numvertexes + 512;
							eb->m.xyz_array			= BZ_Realloc(eb->m.xyz_array,			eb->maxverts * sizeof(*eb->m.xyz_array));
							eb->m.st_array			= BZ_Realloc(eb->m.st_array,			eb->maxverts * sizeof(*eb->m.st_array));
							eb->m.lmst_array[0]		= BZ_Realloc(eb->m.lmst_array[0],		eb->maxverts * sizeof(*eb->m.lmst_array[0]));
							eb->m.normals_array		= BZ_Realloc(eb->m.normals_array,		eb->maxverts * sizeof(*eb->m.normals_array));
							eb->m.snormals_array	= BZ_Realloc(eb->m.snormals_array,		eb->maxverts * sizeof(*eb->m.snormals_array));
							eb->m.tnormals_array	= BZ_Realloc(eb->m.tnormals_array,		eb->maxverts * sizeof(*eb->m.tnormals_array));
							eb->m.colors4f_array[0]	= BZ_Realloc(eb->m.colors4f_array[0],	eb->maxverts * sizeof(*eb->m.colors4f_array[0]));
						}

						memcpy(eb->m.xyz_array+eb->m.numvertexes,		mesh->xyz_array,		sizeof(*eb->m.xyz_array)*mesh->numvertexes);
						memcpy(eb->m.st_array+eb->m.numvertexes,		mesh->st_array,			sizeof(*eb->m.st_array)*mesh->numvertexes);
						memcpy(eb->m.lmst_array[0]+eb->m.numvertexes,	mesh->lmst_array[0],	sizeof(*eb->m.lmst_array[0])*mesh->numvertexes);
						memcpy(eb->m.normals_array+eb->m.numvertexes,	mesh->normals_array,	sizeof(*eb->m.normals_array)*mesh->numvertexes);
						memcpy(eb->m.snormals_array+eb->m.numvertexes,	mesh->snormals_array,	sizeof(*eb->m.snormals_array)*mesh->numvertexes);
						memcpy(eb->m.tnormals_array+eb->m.numvertexes,	mesh->tnormals_array,	sizeof(*eb->m.tnormals_array)*mesh->numvertexes);
						memcpy(eb->m.colors4f_array[0]+eb->m.numvertexes,mesh->colors4f_array[0],sizeof(*eb->m.colors4f_array[0])*mesh->numvertexes);

						for (i = 0; i < mesh->numindexes; i++)
							eb->idxbuffer[eb->numidx+i] = mesh->indexes[i] + eb->m.numvertexes;
						eb->m.numvertexes+=mesh->numvertexes;
					}
					else
					{
						for (i = 0; i < mesh->numindexes; i++)
							eb->idxbuffer[eb->numidx+i] = mesh->indexes[i] + mesh->vbofirstvert;
					}
					eb->numidx += mesh->numindexes;
				}
			}
		}
	}

/*TODO	for (s = 0; s < wmodel->numsubmodels; s++)
	{
		if (!es->bakedsubmodels[s])
			continue;	//not baking this one (not currently visible or something)
		//FIXME: pvscull it here?
		lastface = wmodel->submodels[s].firstface + wmodel->submodels[s].numfaces;
		for (f = wmodel->submodels[s].firstface; f < lastface; f++)
		{
			surf = wmodel->surfaces;

			Surf_RenderDynamicLightmaps_Worker (wmodel, surf, es->lightstylevalues);

			mesh = surf->mesh;
			eb = &es->batches[surf->sbatch->webobatch];
			if (eb->maxidx < eb->numidx + mesh->numindexes)
			{
				//FIXME: pre-allocate
				eb->maxidx = eb->numidx + surf->mesh->numindexes + 512;
				eb->idxbuffer = BZ_Realloc(eb->idxbuffer, eb->maxidx * sizeof(index_t));
			}
			for (i = 0; i < mesh->numindexes; i++)
				eb->idxbuffer[eb->numidx+i] = mesh->indexes[i] + mesh->vbofirstvert;
			eb->numidx += mesh->numindexes;
		}
	}*/
}
#endif
#if defined(Q2BSPS) || defined(Q3BSPS)
static void Surf_SimpleWorld_Q3BSP(struct webostate_s *es, qbyte *pvs)
{
	mleaf_t		*leaf;
	msurface_t	*surf, **mark, **end;
	mesh_t		*mesh;
	model_t *wmodel = es->wmodel;
	int l = wmodel->numleafs;	//is this doing submodels too?
	int c;
	int fc = es->framecount;
	for (leaf = wmodel->leafs; l --> 0; leaf++)
	{
		c = leaf->cluster;
		if (c < 0 || !leaf->parent)
			continue;	//o.O
		if ((pvs[c>>3] & (1u<<(c&7))) && leaf->nummarksurfaces)
		{
			mark = leaf->firstmarksurface;
			end = mark+leaf->nummarksurfaces;
			while(mark < end)
			{
				surf = *mark++;
				if (surf->visframe != fc)
				{
					int i;
					struct wesbatch_s *eb;
					surf->visframe = fc;

					mesh = surf->mesh;
					eb = &es->batches[surf->sbatch->user.bmodel.ebobatch];
					if (eb->maxidx < eb->numidx + mesh->numindexes)
					{
						//FIXME: pre-allocate
						eb->maxidx = eb->numidx + mesh->numindexes + 512;
						eb->idxbuffer = BZ_Realloc(eb->idxbuffer, eb->maxidx * sizeof(index_t));
					}
					if (eb->inefficient)
					{	//slow path that needs to create a single ram-backed mesh
						if (eb->maxverts < eb->m.numvertexes + mesh->numvertexes)
						{
							//FIXME: pre-allocate
							eb->maxverts = eb->m.numvertexes + mesh->numvertexes + 512;
							eb->m.xyz_array		= BZ_Realloc(eb->m.xyz_array,		eb->maxverts * sizeof(*eb->m.xyz_array));
							eb->m.st_array		= BZ_Realloc(eb->m.st_array,		eb->maxverts * sizeof(*eb->m.st_array));
							eb->m.lmst_array[0]	= BZ_Realloc(eb->m.lmst_array[0],	eb->maxverts * sizeof(*eb->m.lmst_array[0]));
							eb->m.normals_array	= BZ_Realloc(eb->m.normals_array,	eb->maxverts * sizeof(*eb->m.normals_array));
							eb->m.snormals_array= BZ_Realloc(eb->m.snormals_array,	eb->maxverts * sizeof(*eb->m.snormals_array));
							eb->m.tnormals_array= BZ_Realloc(eb->m.tnormals_array,	eb->maxverts * sizeof(*eb->m.tnormals_array));
							eb->m.colors4f_array[0]= BZ_Realloc(eb->m.colors4f_array[0],eb->maxverts * sizeof(*eb->m.colors4f_array[0]));
						}
						memcpy(eb->m.numvertexes+eb->m.xyz_array,		mesh->xyz_array,		sizeof(*eb->m.xyz_array)*mesh->numvertexes);
						memcpy(eb->m.numvertexes+eb->m.st_array,		mesh->st_array,			sizeof(*eb->m.st_array)*mesh->numvertexes);
						memcpy(eb->m.numvertexes+eb->m.lmst_array[0],	mesh->lmst_array[0],	sizeof(*eb->m.lmst_array[0])*mesh->numvertexes);
						memcpy(eb->m.numvertexes+eb->m.normals_array,	mesh->normals_array,	sizeof(*eb->m.normals_array)*mesh->numvertexes);
						memcpy(eb->m.numvertexes+eb->m.snormals_array,	mesh->snormals_array,	sizeof(*eb->m.snormals_array)*mesh->numvertexes);
						memcpy(eb->m.numvertexes+eb->m.tnormals_array,	mesh->tnormals_array,	sizeof(*eb->m.tnormals_array)*mesh->numvertexes);
						memcpy(eb->m.numvertexes+eb->m.colors4f_array[0],mesh->colors4f_array[0],sizeof(*eb->m.colors4f_array[0])*mesh->numvertexes);

						for (i = 0; i < mesh->numindexes; i++)
							eb->idxbuffer[eb->numidx+i] = mesh->indexes[i] + eb->m.numvertexes;
						eb->m.numvertexes+=mesh->numvertexes;
					}
					else
					{	//using the general prebaked entire-batch vbos
						for (i = 0; i < mesh->numindexes; i++)
							eb->idxbuffer[eb->numidx+i] = mesh->indexes[i] + mesh->vbofirstvert;
					}
					eb->numidx += mesh->numindexes;
				}
			}
		}
	}
}
#endif
void R_GenWorldEBO(void *ctx, void *data, size_t a, size_t b)
{
	int i;
	struct webostate_s *es = ctx;
	qbyte *pvs;

	if (!es->numbatches)
	{
		int sortid;
		batch_t *batch;

		es->numbatches = es->wmodel->numbatches;

		for (i = 0; i < es->numbatches; i++)
		{
			es->batches[i].firstidx = 0;
			es->batches[i].numidx = 0;
			es->batches[i].maxidx = 0;
			es->batches[i].idxbuffer = NULL;
			es->batches[i].inefficient = false;

			es->batches[i].maxverts = 0;
			memset(&es->batches[i].m, 0, sizeof(es->batches[i].m));
			memset(&es->batches[i].vbo, 0, sizeof(es->batches[i].vbo));
		}

		//set to 2 to reveal the inefficient surfaces...
		if (r_temporalscenecache.ival < 2)
			for (sortid = 0; sortid < SHADER_SORT_COUNT; sortid++)
				for (batch = currentmodel->batches[sortid]; batch != NULL; batch = batch->next)
				{
#if MAXRLIGHTMAPS > 1
					if (batch->lmlightstyle[1] != INVALID_LIGHTSTYLE || batch->vtlightstyle[1] != INVALID_VLIGHTSTYLE)
						continue;	//not supported here, show fallback shader instead (would work but with screwed lighting, we prefer a better-defined result).
#endif
					if (!batch->shader || batch->shader->flags & SHADER_NEEDSARRAYS)
						es->batches[batch->user.bmodel.ebobatch].inefficient = true;
				}
	}
	else
	{
		for (i = 0; i < es->numbatches; i++)
		{
			es->batches[i].firstidx = 0;
			es->batches[i].numidx = 0;
			es->batches[i].m.numvertexes = 0;
		}
	}

	//maybe we should just use fatpvs instead, and wait for completion when outside?
	if (r_novis.ival)
	{
		if (es->pvs.buffersize < es->wmodel->pvsbytes)
			es->pvs.buffer = BZ_Realloc(es->pvs.buffer, es->pvs.buffersize=es->wmodel->pvsbytes);
		memset(es->pvs.buffer, 0xff, es->pvs.buffersize);
		pvs = es->pvs.buffer;
	}
	else if (es->cluster[1] != -1 && es->cluster[0] != es->cluster[1])
	{	//view is near to a water boundary. this implies the water crosses the near clip plane. we need both leafs.
		pvs = es->wmodel->funcs.ClusterPVS(es->wmodel, es->cluster[0], &es->pvs, PVM_REPLACE);
		pvs = es->wmodel->funcs.ClusterPVS(es->wmodel, es->cluster[1], &es->pvs, PVM_MERGE);
	}
	else
		pvs = es->wmodel->funcs.ClusterPVS(es->wmodel, es->cluster[0], &es->pvs, PVM_REPLACE);

#if defined(Q2BSPS) || defined(Q3BSPS)
	if (es->wmodel->fromgame == fg_quake2 || es->wmodel->fromgame == fg_quake3)
		Surf_SimpleWorld_Q3BSP(es, pvs);
	else
#endif
#ifdef Q1BSPS
	if (es->wmodel->fromgame == fg_quake || es->wmodel->fromgame == fg_halflife)
		Surf_SimpleWorld_Q1BSP(es, pvs);
	else
#endif
	{
		//panic
	}

	COM_AddWork(WG_MAIN, R_GeneratedWorldEBO, es, NULL, 0, 0);
}
cvar_t r_temporalscenecache					= CVARAFD ("r_temporalscenecache", "", "r_scenecache", CVAR_ARCHIVE, "Controls whether to generate+reuse a scene cache over multiple frames. This is generated on a separate thread to avoid any associated costs. This can significantly boost framerates on complex maps, but can also stress the gpu more (performance tradeoff that varies per map). An outdated cache may be used if the cache takes too long to build (eg: lightmap animations), which could cause the odd glitch when moving fast (but retain more consistent framerates - another tradeoff).\n0: Tranditional quake rendering.\n1: Generate+Use the scene cache.");
#else
cvar_t r_temporalscenecache					= CVARAFD ("r_temporalscenecache", "", "r_scenecache", CVAR_NOSET, "Controls whether to generate+reuse a scene cache over multiple frames. This is generated on a separate thread to avoid any associated costs. This can significantly boost framerates on complex maps, but can also stress the gpu more (performance tradeoff that varies per map). An outdated cache may be used if the cache takes too long to build (eg: lightmap animations), which could cause the odd glitch when moving fast (but retain more consistent framerates - another tradeoff).\n0: Tranditional quake rendering.\n1: Generate+Use the scene cache.");
#endif

/*
=============
R_DrawWorld
=============
*/

static pvsbuffer_t surf_frustumvis[R_MAX_RECURSE];
void Surf_DrawWorld (void)
{
	//surfvis vs entvis - the key difference is that surfvis is surfaces while entvis is volume. though surfvis should be frustum culled also for lighting. entvis doesn't care.
	qbyte *surfvis, *entvis;
	int areas[2];
	RSpeedLocals();

	if (r_refdef.flags & RDF_NOWORLDMODEL)
	{
		r_refdef.flags |= RDF_NOWORLDMODEL;
		r_refdef.scenevis = NULL;
		BE_DrawWorld(NULL);
		return;
	}
	if (!cl.worldmodel || cl.worldmodel->loadstate != MLS_LOADED)
	{
		/*Don't act as a wallhack*/
		return;
	}

	currentmodel = cl.worldmodel;
	currententity = &r_worldentity;

	{
		int sc = r_temporalscenecache.ival;
		RSpeedRemark();

		Surf_LightmapShift(currentmodel);

#ifdef THREADEDWORLD
		if (!*r_temporalscenecache.string && cl.worldmodel && cl.worldmodel->loadstate == MLS_LOADED && (cl.worldmodel->fromgame == fg_quake || cl.worldmodel->fromgame == fg_halflife))
		{	//when empty, pick a suitable default.
			//at what point is it a win? should we consider batch counts? probability of offscreen-only surfaces?
			if (cl.worldmodel->fromgame == fg_quake || cl.worldmodel->fromgame == fg_halflife)
				sc = cl.worldmodel->numleafs > 6000 && r_waterstyle.ival<=1 && r_telestyle.ival<=1 && r_slimestyle.ival<=1 && r_lavastyle.ival<=1 && Media_Capturing()<2;
		}
		if (sc != r_temporalscenecache.ival)
		{
			r_temporalscenecache.ival = sc;
			r_temporalscenecache.modified = true;
		}
		if (r_temporalscenecache.modified || r_dynamic.modified)
		{
			r_dynamic.modified = false;
			r_temporalscenecache.modified = false;
			Sh_CheckSettings(); //fiddle with r_dynamic vs r_shadow_realtime_dlight.
		}

		if (!r_temporalscenecache.ival)
		{
			r_dynamic.ival = r_dynamic.value;
			webo_blocklightmapupdates = false;
			while (webostates)
			{
				void *webostate = webostates;
				webostates = webostates->next;
				R_DestroyWorldEBO(webostate);
			}
		}
		else if (!r_refdef.recurse && currentmodel->type == mod_brush)
		{
			struct webostate_s *webostate, *best = NULL, *kill, **link;
			vec_t bestdist = FLT_MAX;
			for (webostate = webostates; webostate; webostate = webostate->next)
			{
				if (webostate->wmodel != currentmodel)
					continue;

//				kill = webostate->next;
//				if (kill && kill->lastvalid < cls.framecount-5)
//				{
//					webostate->next = kill->next;
//					R_DestroyWorldEBO(kill);
//				}

				if (webostate->cluster[0] == r_viewcluster && webostate->cluster[1] == r_viewcluster2)
				{
					best = webostate;
					bestdist = 0;
					break;
				}
				else
				{
					vec3_t m;
					float d;
					VectorSubtract(webostate->lastpos, r_refdef.vieworg, m);
					d = DotProduct(m,m);
					if (bestdist > d)
					{
						bestdist = d;
						best = webostate;
					}
				}
			}
			webostate = best;

			if (qrenderer != QR_OPENGL && qrenderer != QR_VULKAN)
				;
#ifdef Q1BSPS
			else if (currentmodel->fromgame == fg_quake || currentmodel->fromgame == fg_halflife || currentmodel->fromgame == fg_quake3)
			{
				if (!webogenerating)
				{
					qboolean gennew = false;
					if (!webostate)
						gennew = true;	//generate an initial one, if we can.
					if (!gennew && webostate && currentmodel->fromgame != fg_quake3)
					{
						int i = cl_max_lightstyles;
						for (i = 0; i < cl_max_lightstyles; i++)
						{
							if (webostate->lightstylevalues[i] != d_lightstylevalue[i])
							{	//a lightstyle changed. something needs to be rebuilt. FIXME: should probably have a bitmask for whether the lightstyle is relevant...
								gennew = true;
								break;
							}
						}
					}

					if (!gennew && webostate && (webostate->cluster[0] != r_viewcluster || webostate->cluster[1] != r_viewcluster2))
					{
						if (webostate->pvs.buffersize != currentmodel->pvsbytes || r_viewcluster2 != -1)
							gennew = true;	//o.O
						else if (memcmp(webostate->pvs.buffer, webostate->wmodel->funcs.ClusterPVS(webostate->wmodel, r_viewcluster, NULL, PVM_FAST), currentmodel->pvsbytes))
							gennew = true;
						else
						{	//okay, so the pvs didn't change despite the clusters changing. this happens when using unvised maps or lots of func_detail
							//just hack the cluster numbers so we don't have to do the memcmp above repeatedly for no reason.
							webostate->cluster[0] = r_viewcluster;
							webostate->cluster[1] = r_viewcluster2;
						}
					}

					if (gennew)
					{
						int i;
						if (!currentmodel->numbatches)
						{
							int sortid;
							batch_t *batch;
							currentmodel->numbatches = 0;
							for (sortid = 0; sortid < SHADER_SORT_COUNT; sortid++)
								for (batch = currentmodel->batches[sortid]; batch != NULL; batch = batch->next)
								{
									batch->user.bmodel.ebobatch = currentmodel->numbatches;
									currentmodel->numbatches++;
								}
							/*TODO submodels too*/
						}

						webogeneratingstate = true;

						webogenerating = NULL;
						if (webostate)
							webostate->lastvalid = cls.framecount;
						for (link = &webostates; (kill=*link); )
						{
							if (kill->lastvalid < cls.framecount-5 && kill->wmodel == currentmodel && kill != webostate)
							{	//this one looks old... kill it.
								if (webogenerating)
									R_DestroyWorldEBO(webogenerating);	//can't use more than one!
								webogenerating = kill;
								*link = kill->next;
							}
							else
								link = &(*link)->next;
						}
						if (!webogenerating)
						{
							webogenerating = BZ_Malloc(sizeof(*webogenerating) + sizeof(webogenerating->batches[0]) * (currentmodel->numbatches-1) + currentmodel->pvsbytes);
							memset(&webogenerating->vbo, 0, sizeof(webogenerating->vbo));
							memset(&webogenerating->ebo, 0, sizeof(webogenerating->ebo));
							webogenerating->ebomem = NULL;
							webogenerating->numbatches = 0;
						}
						VectorCopy(r_refdef.vieworg, webogenerating->lastpos);
						webogenerating->wmodel = currentmodel;
						webogenerating->framecount = -r_framecount;
						webogenerating->cluster[0] = r_viewcluster;
						webogenerating->cluster[1] = r_viewcluster2;
						webogenerating->pvs.buffer = (qbyte*)(webogenerating+1) + sizeof(webogenerating->batches[0])*(currentmodel->numbatches-1);
						webogenerating->pvs.buffersize = currentmodel->pvsbytes;
						for (i = 0; i < cl_max_lightstyles; i++)
							webogenerating->lightstylevalues[i] = d_lightstylevalue[i];
						Q_strncpyz(webogenerating->dbgid, "webostate", sizeof(webogenerating->dbgid));
						COM_AddWork(WG_LOADER, R_GenWorldEBO, webogenerating, NULL, 0, 0);
					}
				}
			}
#endif

			//if they teleported, don't show something ugly - like obvious wallhacks.
			if (webogenerating && bestdist > 16 && cl.splitclients<=1)
			{
				Con_DPrintf("Blocking for scenecache generation\n");
				webostate = webogenerating;
				COM_WorkerPartialSync(webogenerating, &webogeneratingstate, true);
			}

			if (webostate)
			{
				entvis = surfvis = webostate->pvs.buffer;

				webostate->lastvalid = cls.framecount;

				VectorCopy(r_refdef.vieworg, webostate->lastpos);

				r_dynamic.ival = -1;	//don't waste time on dlighting models.

				RSpeedEnd(RSPEED_WORLDNODE);

				areas[0] = 1;
				areas[1] = r_viewarea;
				CL_LinkStaticEntities(entvis, areas);
				TRACE(("dbg: calling R_DrawParticles\n"));
				if (!r_refdef.recurse && !(r_refdef.flags & RDF_DISABLEPARTICLES))
					P_DrawParticles ();

				TRACE(("dbg: calling BE_DrawWorld\n"));
				r_refdef.scenevis = surfvis;
				BE_DrawWorld(webostate->rbatches);

				/*FIXME: move this away*/
				if (currentmodel->fromgame == fg_quake || currentmodel->fromgame == fg_halflife)
					Surf_LessenStains();
				return;
			}
		}
#endif


		Surf_PushChains(currentmodel->batches);

		if (currentmodel->type != mod_brush)
		{
			frustumvis = NULL;
			entvis = surfvis = NULL;
		}
#if defined(Q2BSPS) || defined(Q3BSPS)
		else if (currentmodel->fromgame == fg_quake2 || currentmodel->fromgame == fg_quake3)
		{
			pvsbuffer_t *vis = &surf_frustumvis[r_refdef.recurse];
			if (vis->buffersize < currentmodel->pvsbytes)
				vis->buffer = BZ_Realloc(vis->buffer, vis->buffersize=currentmodel->pvsbytes);
			frustumvis = vis->buffer;
			memset(frustumvis, 0, currentmodel->pvsbytes);

			if (!r_refdef.areabitsknown)
			{	//generate the info each frame, as the gamecode didn't tell us what to use.
				int leafnum = CM_PointLeafnum (currentmodel, r_refdef.vieworg);
				int clientarea = CM_LeafArea (currentmodel, leafnum);
				CM_WriteAreaBits(currentmodel, r_refdef.areabits, clientarea, false);
				r_refdef.areabitsknown = true;
			}
#ifdef Q3BSPS
			if (currentmodel->fromgame == fg_quake3)
			{
				entvis = surfvis = R_MarkLeaves_Q3 ();
				Surf_RecursiveQ3WorldNode (currentmodel->nodes, (1<<r_refdef.frustum_numworldplanes)-1);
				//Surf_LeafWorldNode ();
			}
			else
#endif
#ifdef Q2BSPS
			if (currentmodel->fromgame == fg_quake2)
			{
				entvis = surfvis = R_MarkLeaves_Q2 ();
				VectorCopy (r_refdef.vieworg, modelorg);
				Surf_RecursiveQ2WorldNode (currentmodel->nodes);
			}
			else
#endif
			{
				entvis = surfvis = NULL;
			}

			surfvis = frustumvis;
		}
#endif
#ifdef MAP_PROC
		else if (currentmodel->fromgame == fg_doom3)
		{
			entvis = surfvis = D3_CalcVis(currentmodel, r_origin);
		}
#endif
#ifdef MAP_DOOM
		else if (currentmodel->fromgame == fg_doom)
		{
			entvis = surfvis = NULL;
			R_DoomWorld();
		}
#endif
#ifdef Q1BSPS
		else if (1)
		{
			//extern cvar_t temp1;
//			if (0)//temp1.value)
//				entvis = surfvis = R_MarkLeafSurfaces_Q1();
//			else
			{
				pvsbuffer_t *vis = &surf_frustumvis[r_refdef.recurse];

				entvis = R_MarkLeaves_Q1 (false);
				if (!(r_novis.ival & 2))
					VectorCopy (r_origin, modelorg);

				if (vis->buffersize < currentmodel->pvsbytes)
					vis->buffer = BZ_Realloc(vis->buffer, vis->buffersize=currentmodel->pvsbytes);
				frustumvis = vis->buffer;
				memset(frustumvis, 0, currentmodel->pvsbytes);

				if (r_refdef.useperspective)
					Surf_RecursiveWorldNode (currentmodel->nodes, 0x1f);
				else
					Surf_OrthoRecursiveWorldNode (currentmodel->nodes, 0x1f);
				surfvis = frustumvis;
			}
		}
#endif
		else
		{
			frustumvis = NULL;
			entvis = surfvis = NULL;
		}

		RSpeedEnd(RSPEED_WORLDNODE);

		areas[0] = 1;
		areas[1] = r_viewarea;
		r_refdef.sceneareas = areas;
		if (!(r_refdef.flags & RDF_NOWORLDMODEL))
		{
			CL_LinkStaticEntities(entvis, r_refdef.sceneareas);
			TRACE(("dbg: calling R_DrawParticles\n"));
			if (!r_refdef.recurse && !(r_refdef.flags & RDF_DISABLEPARTICLES))
				P_DrawParticles ();
		}

		TRACE(("dbg: calling BE_DrawWorld\n"));
		r_refdef.scenevis = surfvis;
		BE_DrawWorld(cl.worldmodel->batches);

		Surf_PopChains(cl.worldmodel->batches);

		/*FIXME: move this away*/
		if (cl.worldmodel->fromgame == fg_quake || cl.worldmodel->fromgame == fg_halflife)
			Surf_LessenStains();
	}
}

unsigned int Surf_CalcMemSize(msurface_t *surf)
{
	if (surf->mesh)
		return 0;

	if (!surf->numedges)
		return 0;

	//figure out how much space this surface needs
	return sizeof(mesh_t) + 
	sizeof(index_t)*(surf->numedges-2)*3 +
	(sizeof(vecV_t)+sizeof(vec2_t)*2+sizeof(vec3_t)*3+sizeof(vec4_t))*surf->numedges;
}

void Surf_DeInit(void)
{
	int i;

#ifdef THREADEDWORLD
	webo_blocklightmapupdates = 0;
	while(webogenerating)
		COM_WorkerPartialSync(webogenerating, &webogeneratingstate, true);
	while (webostates)
	{
		void *webostate = webostates;
		webostates = webostates->next;
		R_DestroyWorldEBO(webostate);
	}
#endif

	for (i = 0; i < numlightmaps; i++)
	{
		Surf_FreeLightmap(lightmap[i]);
		lightmap[i] = NULL;
	}

	if (lightmap)
		BZ_Free(lightmap);

	for (i = 0; i < R_MAX_RECURSE; i++)
		Z_Free(surf_frustumvis[i].buffer);
	memset(surf_frustumvis, 0, sizeof(surf_frustumvis));

	CL_FreeDlights();

	lightmap=NULL;
	numlightmaps=0;

	Alias_Shutdown();
	Shader_ResetRemaps();
}

void Surf_Clear(model_t *mod)
{
	int i;
	vbo_t *vbo;
//	if (mod->fromgame == fg_doom3)
//		return;/*they're on the hunk*/

#ifdef THREADEDWORLD
	struct webostate_s **link, *t;
	while(webogenerating)
		COM_WorkerPartialSync(webogenerating, &webogeneratingstate, true);

	for (link = &webostates; (t=*link); )
	{
		if (t->wmodel == mod)
		{
			*link = t->next;
			R_DestroyWorldEBO(t);
		}
		else
			link = &(*link)->next;
	}
#endif

	while(mod->vbos)
	{
		vbo = mod->vbos;
		mod->vbos = vbo->next;
		BE_ClearVBO(vbo, false);
	}

	if (!mod->submodelof)
	{
		for (i = 0; i < mod->numtextures; i++)
		{
			R_UnloadShader(mod->textures[i]->shader);
			mod->textures[i]->shader = NULL;
		}
	}
	mod->numtextures = 0;

	BZ_Free(mod->shadowbatches);
	mod->numshadowbatches = 0;
	mod->shadowbatches = NULL;
#ifdef RTLIGHTS
	Sh_PurgeShadowMeshes();
#endif

	BZ_Free(blocklights);
	BZ_Free(blocknormals);
	blocklights = NULL;
	blocknormals = NULL;
	maxblocksize = 0;
}

uploadfmt_t Surf_NameToFormat(const char *nam)
{
	static uploadfmt_t tab[] = {PTI_L8, PTI_RGB8, PTI_BGRA8, PTI_A2BGR10, PTI_E5BGR9, PTI_RGBA16F, PTI_RGBA32F, PTI_RGB565, PTI_RGBA4444, PTI_RGBA5551};
	int idx = atoi(nam)-1;
	if (idx>=0 && idx < countof(tab))
		return tab[idx];

	if (!Q_strcasecmp(nam, "e5bgr9") || !Q_strcasecmp(nam, "rgb9e5"))
		return PTI_E5BGR9;	//prefered hdr format, for some reason.
	if (!Q_strcasecmp(nam, "a2bgr10") || !Q_strcasecmp(nam, "rgb10a2") || !Q_strcasecmp(nam, "rgb10"))
		return PTI_A2BGR10;	//prefered ldr format. hurrah for 10 bits.
	if (!Q_strcasecmp(nam, "rgba32f"))
		return PTI_RGBA32F;	//big bulky hdr format
	if (!Q_strcasecmp(nam, "rgba16f"))
		return PTI_RGBA16F;	//tolerable hdr format
//	if (!Q_strcasecmp(nam, "rgba8s"))
//		return PTI_RGBA8_SIGNED;
	if (!Q_strcasecmp(nam, "rgb565") || !Q_strcasecmp(nam, "rgb5"))
		return PTI_RGB565;	//boo hiss
	if (!Q_strcasecmp(nam, "rgba4444") || !Q_strcasecmp(nam, "rgba4"))
		return PTI_RGBA4444;	//erk
	if (!Q_strcasecmp(nam, "rgba5551") || !Q_strcasecmp(nam, "rgba51") || !Q_strcasecmp(nam, "rgb5a1"))
		return PTI_RGBA5551;
	if (!Q_strcasecmp(nam, "argb4444"))
		return PTI_ARGB4444;
	if (!Q_strcasecmp(nam, "argb1555"))
		return PTI_ARGB1555;
	if (!Q_strcasecmp(nam, "rgbx8") || !Q_strcasecmp(nam, "bgrx8") || !Q_strcasecmp(nam, "rgba8") || !Q_strcasecmp(nam, "bgra8"))
		return PTI_BGRX8;	//most common formats...
	if (!Q_strcasecmp(nam, "rgb8") || !Q_strcasecmp(nam, "bgr8"))
		return PTI_RGB8;	//generally not recommended (misaligned so the gpu has to compensate)
	if (!Q_strcasecmp(nam, "l8"))
		return PTI_L8;
	if (*nam)
		Con_Printf("Unknown lightmap format: %s\n", nam);
	return PTI_INVALID;
}

//pick fastest mode for lightmap data
uploadfmt_t Surf_LightmapMode(model_t *model)
{
	uploadfmt_t fmt = Surf_NameToFormat(r_lightmap_format.string);
	if (!sh_config.texfmt[fmt])
	{
		qboolean hdr = (vid.flags&VID_SRGBAWARE), rgb = false;

		if (fmt != PTI_INVALID)
			Con_Printf("lightmap format %s not supported by renderer\n", r_lightmap_format.string);

		if (model)
		{
			switch (model->lightmaps.fmt)
			{
			case LM_E5BGR9:
				hdr = rgb = true;
				break;
			case LM_RGB8:
				rgb = true;
				break;
			case LM_L8:
				break;
			}
			if (model->deluxdata)
				rgb = true;

			if (model->terrain)	//the terrain code requires rgba8.
				hdr = false;
		}

		if (sh_config.texfmt[PTI_E5BGR9] && hdr)
			fmt = PTI_E5BGR9;
		else if (sh_config.texfmt[PTI_RGBA16F] && hdr)
			fmt = PTI_RGBA16F;
		else if (sh_config.texfmt[PTI_RGBA32F] && hdr)
			fmt = PTI_RGBA32F;
		else if (sh_config.texfmt[PTI_A2BGR10] && rgb)
			fmt = PTI_A2BGR10;
		else if (sh_config.texfmt[PTI_L8] && !rgb && !r_deluxemapping && r_dynamic.ival<=0)
			fmt = PTI_L8;
		else if (sh_config.texfmt[PTI_BGRX8])
			fmt = PTI_BGRX8;
		else if (sh_config.texfmt[PTI_RGB8])
			fmt = PTI_RGB8;
		else
			fmt = PTI_RGBX8;

	}

	if (!model->submodelof)
		Con_DPrintf("%s: Using lightmap format %s\n", model->name, Image_FormatName(fmt));

	return fmt;
}

static void Surf_FreeLightmap(lightmapinfo_t *lm)
{
	if (lm)
	{
#ifdef GLQUAKE
		if (lm->pbo_handle)
		{
			qglBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, lm->pbo_handle);
			qglUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB);
			qglBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
			qglDeleteBuffersARB(1, &lm->pbo_handle);
		}
#endif
		if (!lm->external)
			Image_DestroyTexture(lm->lightmap_texture);
		BZ_Free(lm);
	}
}

//needs to be followed by a BE_UploadAllLightmaps at some point
int Surf_NewLightmaps(int count, int width, int height, uploadfmt_t fmt, qboolean deluxe)
{
	int first = numlightmaps;
	int i;

	unsigned int pixbytes, pixw, pixh, pixd;
	unsigned int dpixbytes, dpixw, dpixh, dpixd;
	uploadfmt_t dfmt;
#ifdef THREADEDWORLD
	extern int webo_blocklightmapupdates;
	webo_blocklightmapupdates = 0;
#endif

	if (!count)
		return -1;

	if (deluxe && (count & 1))
	{
		deluxe = false;
//		count+=1;
		Con_Print("WARNING: Deluxemapping with odd number of lightmaps\n");
	}

	Image_BlockSizeForEncoding(fmt, &pixbytes, &pixw, &pixh, &pixd);
	if (pixw != 1 || pixh != 1 || pixd != 1)
		return -1;	//compressed formats are unsupported
	dfmt = PTI_A2BGR10;	//favour this one, because it tends to be slightly faster.
	if (!sh_config.texfmt[dfmt])
		dfmt = PTI_BGRX8;
	if (!sh_config.texfmt[dfmt])
		dfmt = PTI_RGBX8;
	if (!sh_config.texfmt[dfmt])
		dfmt = PTI_RGB8;
	Image_BlockSizeForEncoding(dfmt, &dpixbytes, &dpixw, &dpixh, &dpixd);
	if (dpixw != 1 || dpixh != 1 || dpixd != 1)
		return -1;	//compressed formats are unsupported

	Sys_LockMutex(com_resourcemutex);

	i = numlightmaps + count;
	lightmap = BZ_Realloc(lightmap, sizeof(*lightmap)*(i));
	while(i --> first)
	{
#ifdef GLQUAKE
		extern cvar_t gl_pbolightmaps;
		//we might as well use a pbo for our staging memory.
		if (qrenderer == QR_OPENGL && qglBufferStorage && qglMapBufferRange && gl_pbolightmaps.ival && Sys_IsMainThread())
		{	//glBufferStorage and GL_MAP_PERSISTENT_BIT generally means gl4.4+ (we need persistent for scenecache)
			//pbos are 2.1
			if (deluxe && ((i - numlightmaps)&1))
			{
				lightmap[i] = Z_Malloc(sizeof(*lightmap[i]));
				lightmap[i]->width = width;
				lightmap[i]->height = height;
				lightmap[i]->lightmaps = NULL;
				lightmap[i]->stainmaps = NULL;
				lightmap[i]->hasdeluxe = false;
				lightmap[i]->pixbytes = dpixbytes;
				lightmap[i]->fmt = dfmt;
			}
			else
			{
				lightmap[i] = Z_Malloc(sizeof(*lightmap[i]) + (sizeof(stmap)*3)*width*height);
				lightmap[i]->width = width;
				lightmap[i]->height = height;
				lightmap[i]->lightmaps = NULL;
				lightmap[i]->stainmaps = (qbyte*)(lightmap[i]+1);
				lightmap[i]->hasdeluxe = deluxe;
				lightmap[i]->pixbytes = pixbytes;
				lightmap[i]->fmt = fmt;
			}

			qglGenBuffersARB(1, &lightmap[i]->pbo_handle);
			qglBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, lightmap[i]->pbo_handle);
			//note: we only write the memory. the pbo would normally be in system memory anyway so there shouldn't be too much cost from coherent mappings.
			qglBufferStorage(GL_PIXEL_UNPACK_BUFFER_ARB, lightmap[i]->pixbytes*width*height, NULL, GL_MAP_WRITE_BIT|GL_MAP_PERSISTENT_BIT|GL_MAP_COHERENT_BIT);
			lightmap[i]->lightmaps = qglMapBufferRange(GL_PIXEL_UNPACK_BUFFER_ARB, 0, lightmap[i]->pixbytes*width*height, GL_MAP_WRITE_BIT|GL_MAP_PERSISTENT_BIT|GL_MAP_COHERENT_BIT);
			qglBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
		}
		else
#endif
		{
			if (deluxe && ((i - numlightmaps)&1))
			{	//deluxemaps always use a specific format.
				lightmap[i] = Z_Malloc(sizeof(*lightmap[i]) + (sizeof(qbyte)*dpixbytes)*width*height);
				lightmap[i]->width = width;
				lightmap[i]->height = height;
				lightmap[i]->lightmaps = (qbyte*)(lightmap[i]+1);
				lightmap[i]->stainmaps = NULL;
				lightmap[i]->hasdeluxe = false;
				lightmap[i]->pixbytes = dpixbytes;
				lightmap[i]->fmt = dfmt;
			}
			else
			{
				lightmap[i] = Z_Malloc(sizeof(*lightmap[i]) + (sizeof(qbyte)*pixbytes + sizeof(stmap)*3)*width*height);
				lightmap[i]->width = width;
				lightmap[i]->height = height;
				lightmap[i]->lightmaps = (qbyte*)(lightmap[i]+1);
				lightmap[i]->stainmaps = (stmap*)(lightmap[i]->lightmaps+pixbytes*width*height);
				lightmap[i]->hasdeluxe = deluxe;
				lightmap[i]->pixbytes = pixbytes;
				lightmap[i]->fmt = fmt;
			}
		}

		lightmap[i]->rectchange.l = 0;
		lightmap[i]->rectchange.t = 0;
		lightmap[i]->rectchange.b = lightmap[i]->height;
		lightmap[i]->rectchange.r = lightmap[i]->width;


		lightmap[i]->lightmap_texture = r_nulltex;
		lightmap[i]->modified = true;
//			lightmap[i]->shader = NULL;
		lightmap[i]->external = false;
		// reset stainmap since it now starts at 255
		if (lightmap[i]->stainmaps)
			memset(lightmap[i]->stainmaps, 255, width*height*3*sizeof(stmap));
	}

	numlightmaps += count;

	Sys_UnlockMutex(com_resourcemutex);

	return first;
}
int Surf_NewExternalLightmaps(int count, char *filepattern, qboolean deluxe)
{
	unsigned int nulllight = 0xffffffff;
	unsigned int nulldeluxe = 0xffff7f7f;
	int first = numlightmaps;
	int i;
	char nname[MAX_QPATH];
	qboolean odd = (count & 1) && deluxe;

#ifdef THREADEDWORLD
	extern int webo_blocklightmapupdates;
	webo_blocklightmapupdates = 0;
#endif

	if (!count)
		return -1;

	if (odd)
		count++;

	i = numlightmaps + count;
	lightmap = BZ_Realloc(lightmap, sizeof(*lightmap)*(i));
	while(i > first)
	{
		i--;

		lightmap[i] = Z_Malloc(sizeof(*lightmap[i]));
		lightmap[i]->width = 0;
		lightmap[i]->height = 0;
		lightmap[i]->lightmaps = NULL;
		lightmap[i]->stainmaps = NULL;

		lightmap[i]->modified = false;
		lightmap[i]->external = true;
		lightmap[i]->hasdeluxe = (deluxe && !((i - numlightmaps)&1));

		Q_snprintfz(nname, sizeof(nname), filepattern, i - numlightmaps);

		TEXASSIGN(lightmap[i]->lightmap_texture, R_LoadHiResTexture(nname, NULL, (r_lightmap_nearest.ival?IF_NEAREST:IF_LINEAR)|IF_NOMIPMAP));
		if (lightmap[i]->lightmap_texture->status == TEX_LOADING)
			COM_WorkerPartialSync(lightmap[i]->lightmap_texture, &lightmap[i]->lightmap_texture->status, TEX_LOADING);
		if (lightmap[i]->lightmap_texture->status == TEX_FAILED)
		{
			if ((i&1) && deluxe)
				lightmap[i]->lightmap_texture = R_LoadReplacementTexture("*nulldeluxe", NULL, IF_LOADNOW, &nulldeluxe, 1, 1, TF_RGBX32);
			else
				lightmap[i]->lightmap_texture = R_LoadReplacementTexture("*nulllight", NULL, IF_LOADNOW, &nulllight, 1, 1, TF_RGBX32);
		}
		lightmap[i]->width = lightmap[i]->lightmap_texture->width;
		lightmap[i]->height = lightmap[i]->lightmap_texture->height;
		lightmap[i]->fmt = lightmap[i]->lightmap_texture->format;
	}

	if (odd)
	{
		i = numlightmaps+count-1;
		if (!TEXVALID(lightmap[i]->lightmap_texture))
		{	//FIXME: no deluxemaps after all...
			Z_Free(lightmap[i]);
			lightmap[i] = NULL;
			count--;
		}
	}

	numlightmaps += count;

	return first;
}

void Surf_BuildModelLightmaps (model_t *m)
{
	int		i;
	int shift;
	msurface_t *surf;
	batch_t *batch;
	int sortid;
	int newfirst;
	uploadfmt_t fmt;

	if (m->loadstate != MLS_LOADED)
		return;

#ifdef TERRAIN
	//easiest way to deal with heightmap lightmaps is to just purge the entire thing.
	if (m->terrain)
		Terr_PurgeTerrainModel(m, false, false);	//FIXME: cop out. middle arg should be 'true'.
#endif

	if (m->type != mod_brush)
		return;

	if (!m->lightmaps.count)
		return;

	currentmodel = m;
	shift = Surf_LightmapShift(currentmodel);

	fmt = Surf_LightmapMode(m);

#ifdef THREADEDWORLD
	//make sure nothing is poking the lightmaps while we're rewriting them
	while(webogenerating)
		COM_WorkerPartialSync(webogenerating, &webogeneratingstate, true);
#endif

	R_BumpLightstyles(m->lightmaps.maxstyle);	//should only really happen with lazy loading

	if (m->submodelof && m->fromgame == fg_quake3)	//FIXME: should be all bsp formats
	{
		if (m->submodelof->loadstate != MLS_LOADED)
			return;
		newfirst = m->submodelof->lightmaps.first;
	}
	else
	{
		if (!m->lightdata && m->lightmaps.count && m->fromgame == fg_quake3)
		{
			char pattern[MAX_QPATH];
			COM_StripAllExtensions(m->name, pattern, sizeof(pattern));
			Q_strncatz(pattern, "/lm_%04u.tga", sizeof(pattern));
			newfirst = Surf_NewExternalLightmaps(m->lightmaps.count, pattern, m->lightmaps.deluxemapping);
			m->lightmaps.count = numlightmaps - newfirst;
		}
		else
			newfirst = Surf_NewLightmaps(m->lightmaps.count, m->lightmaps.width, m->lightmaps.height, fmt, m->lightmaps.deluxemapping);
	}

	//fixup batch lightmaps
	for (sortid = 0; sortid < SHADER_SORT_COUNT; sortid++)
	for (batch = m->batches[sortid]; batch != NULL; batch = batch->next)
	{
		for (i = 0; i < MAXRLIGHTMAPS; i++)
		{
			if (batch->lightmap[i] < 0)
				continue;
			batch->lightmap[i] = batch->lightmap[i] - m->lightmaps.first + newfirst;
		}
	}

	if (m->fromgame == fg_quake3)
	{
		int j;
		unsigned char *src, *stop;
		unsigned char *dst;


		//fixup surface lightmaps, and paint
		for (i=0; i<m->nummodelsurfaces; i++)
		{
			surf = m->surfaces + i + m->firstmodelsurface;
			for (j = 0; j < MAXRLIGHTMAPS; j++)
			{
				if (surf->lightmaptexturenums[j] < m->lightmaps.first)
				{
					surf->lightmaptexturenums[j] = -1;
					continue;
				}
				if (surf->lightmaptexturenums[j] >= m->lightmaps.first+m->lightmaps.count)
				{
					surf->lightmaptexturenums[j] = -1;
					continue;
				}
				surf->lightmaptexturenums[j] = surf->lightmaptexturenums[0] - m->lightmaps.first + newfirst;
			}
		}

		if (!m->submodelof)
		for (i = 0; i < m->lightmaps.count; i++)
		{
			if (lightmap[newfirst+i]->external)
				continue;

			dst = lightmap[newfirst+i]->lightmaps;
			src = m->lightdata + i*m->lightmaps.width*m->lightmaps.height*3;
			stop = m->lightdata + (i+1)*m->lightmaps.width*m->lightmaps.height*3;
			if (stop-m->lightdata > m->lightdatasize)
				stop = m->lightdata + m->lightdatasize;
			if (m->lightdata)
			{
				switch(lightmap[newfirst+i]->fmt)
				{
				default:
					Sys_Error("Bad lightmap_fmt\n");
					break;
				case PTI_A2BGR10:
					for (; src < stop; dst += 4, src += 3)
						*(unsigned int*)dst = (0x3<<30) | (src[2]<<22) | (src[1]<<12) | (src[0]<<2);
					break;
				case PTI_E5BGR9:
					for (; src < stop; dst += 4, src += 3)
						*(unsigned int*)dst = Surf_PackE5BRG9(src[0], src[1], src[2], 8);
					break;
				case PTI_BGRA8:
				case PTI_BGRX8:
					for (; src < stop; dst += 4, src += 3)
					{
						dst[0] = src[2];
						dst[1] = src[1];
						dst[2] = src[0];
						dst[3] = 255;
					}
					break;
				/*case TF_RGBA32:
					for (; src < stop; dst += 4, src += 3)
					{
						dst[0] = src[0];
						dst[1] = src[1];
						dst[2] = src[2];
						dst[3] = 255;
					}
					break;
				case TF_BGR24:
					for (; src < stop; dst += 3, src += 3)
					{
						dst[0] = src[2];
						dst[1] = src[1];
						dst[2] = src[0];
					}
					break;*/
				case TF_RGB24:
					for (; src < stop; dst += 3, src += 3)
					{
						dst[0] = src[0];
						dst[1] = src[1];
						dst[2] = src[2];
					}
					break;
				case PTI_RGB565:
					for (; src < stop; dst += 2, src += 3)
						*(unsigned short*)dst = ((src[0]>>3)<<11)|((src[1]>>2)<<5)|((src[2]>>3)<<0);
					break;
				case PTI_L8:
					for (; src < stop; dst += 1, src += 3)
					{
						dst[0] = max(max(src[0], src[1]), src[2]);
					}
					break;
				}
			}
		}
	}
	else
	{
		int j;

//		if (*m->name == '*')
//		{
//			if (!cl.worldmodel || cl.worldmodel->loadstate != MLS_LOADED)
//				return;
//		}
		//fixup surface lightmaps, and paint
		for (i=0; i<m->nummodelsurfaces; i++)
		{
			surf = m->surfaces + i + m->firstmodelsurface;
			for (j = 0; j < MAXRLIGHTMAPS; j++)
			{
				if (surf->lightmaptexturenums[j] < m->lightmaps.first)
				{
					surf->lightmaptexturenums[j] = -1;
					continue;
				}
				if (surf->lightmaptexturenums[j] >= m->lightmaps.first+m->lightmaps.count)
				{
					surf->lightmaptexturenums[j] = -1;
					continue;
				}
				surf->lightmaptexturenums[j] = surf->lightmaptexturenums[j] - m->lightmaps.first + newfirst;

				Surf_BuildLightMap (m, surf, j, shift, r_ambient.value*255, d_lightstylevalue);
			}
		}
	}
	m->lightmaps.first = newfirst;
}

void Surf_ClearLightmaps(void)
{
#ifdef THREADEDWORLD
	while(webogenerating)
		COM_WorkerPartialSync(webogenerating, &webogeneratingstate, true);
	while (webostates)
	{
		void *webostate = webostates;
		webostates = webostates->next;
		R_DestroyWorldEBO(webostate);
	}
#endif
}

/*
==================
GL_BuildLightmaps

Builds the lightmap texture
with all the surfaces from all brush models
Groups surfaces into their respective batches (based on the lightmap number).
==================
*/
void Surf_BuildLightmaps (void)
{
	unsigned int		i, j;
	model_t	*m;

	extern model_t	*mod_known;
	extern int		mod_numknown;

	int maxstyle;

	//make sure the lightstyle values are correct (and be sure that the sizes cover all models).
	for (i = 0, maxstyle=0; i < mod_numknown; i++)
	{
		m = &mod_known[i];
		if (m->loadstate == MLS_LOADED)
			if (maxstyle < m->lightmaps.maxstyle)
				maxstyle = m->lightmaps.maxstyle;
	}
	R_BumpLightstyles(maxstyle);	//should only really happen with lazy loading
	R_AnimateLight();

	r_framecount = 1;		// no dlightcache

	while(numlightmaps > 0)
	{
		numlightmaps--;
		Surf_FreeLightmap(lightmap[numlightmaps]);
		lightmap[numlightmaps] = NULL;
	}

	r_oldviewcluster = -1;
	r_oldviewcluster2 = -1;

	//FIXME: unload stuff that's no longer relevant somehow.
	for (i = 0; i < mod_numknown; i++)
	{
		m = &mod_known[i];
		if (m->loadstate != MLS_LOADED)
			continue;
		Surf_BuildModelLightmaps(m);

		for (j = 0; j < m->numenvmaps; j++)
			if (m->envmaps[j].image)
				m->envmaps[j].image->regsequence = r_regsequence;
	}
	BE_UploadAllLightmaps();
}



/*
===============
Surf_NewMap
===============
*/
void Surf_NewMap (void)
{
	char namebuf[MAX_QPATH];
	extern cvar_t host_mapname;
#ifdef BEF_PUSHDEPTH
	extern cvar_t r_polygonoffset_submodel_maps;
	char *s;
#endif
	int		i;

	//evil haxx
	r_dynamic.ival = r_dynamic.value;
	if (r_dynamic.ival > 0 && cl.worldmodel->fromgame == fg_quake3) //quake3 has no lightmaps, disable r_dynamic
		r_dynamic.ival = 0;

	memset (&r_worldentity, 0, sizeof(r_worldentity));
	AngleVectors(r_worldentity.angles, r_worldentity.axis[0], r_worldentity.axis[1], r_worldentity.axis[2]);
	VectorInverse(r_worldentity.axis[1]);
	r_worldentity.model = cl.worldmodel;
	Vector4Set(r_worldentity.shaderRGBAf, 1, 1, 1, 1);
	VectorSet(r_worldentity.light_avg, 1, 1, 1);


	if (cl.worldmodel)
		COM_FileBase(cl.worldmodel->name, namebuf, sizeof(namebuf));
	else
		*namebuf = '\0';
	Cvar_Set(&host_mapname, namebuf);

	Surf_DeInit();

	r_viewcluster = -1;
	r_oldviewcluster = 0;
	r_viewcluster2 = -1;
	r_oldviewcluster2 = 0;
#ifdef BEF_PUSHDEPTH
	r_pushdepth = false;
	for (s = r_polygonoffset_submodel_maps.string; s && *s; )
	{
		s = COM_Parse(s);
		if (*com_token)
			if (wildcmp(com_token, namebuf))
			{
				r_pushdepth = true;
				break;
			}
	}
#endif

	TRACE(("dbg: Surf_NewMap: clear particles\n"));
	P_ClearParticles ();
	CL_RegisterParticles();

	Shader_DoReload();
	if (cl.worldmodel)
	{
		if (cl.worldmodel->loadstate == MLS_LOADING)
			COM_WorkerPartialSync(cl.worldmodel, &cl.worldmodel->loadstate, MLS_LOADING);
		Mod_ParseInfoFromEntityLump(cl.worldmodel);
	}
	Shader_DoReload();

#ifdef THREADEDWORLD
	Cvar_ForceCallback(&r_temporalscenecache);
#endif

	if (!pe)
		Cvar_ForceCallback(&r_particlesystem);
	R_Clutter_Purge();
TRACE(("dbg: Surf_NewMap: wiping them stains (getting the cloth out)\n"));
	Surf_WipeStains();
TRACE(("dbg: Surf_NewMap: building lightmaps\n"));
	Surf_BuildLightmaps ();


TRACE(("dbg: Surf_NewMap: ui\n"));
#ifdef VM_UI
	UI_Reset();
#endif
TRACE(("dbg: Surf_NewMap: tp\n"));
	TP_NewMap();

	for (i = 0; i < cl.num_statics; i++)
	{
		vec3_t mins, maxs;
		//fixme: no rotation
		if (!cl_static_entities[i].ent.model && cl_static_entities[i].mdlidx > 0 && cl_static_entities[i].mdlidx < countof(cl.model_precache))
			cl_static_entities[i].ent.model = cl.model_precache[cl_static_entities[i].mdlidx];
		else if (!cl_static_entities[i].ent.model && cl_static_entities[i].mdlidx < 0 && (-cl_static_entities[i].mdlidx) < countof(cl.model_csqcprecache))
			cl_static_entities[i].ent.model = cl.model_csqcprecache[-cl_static_entities[i].mdlidx];
		if (cl_static_entities[i].ent.model)
		{
			//unfortunately, we need to know the actual size so that we can get this right. bum.
			if (cl_static_entities[i].ent.model->loadstate == MLS_NOTLOADED)
				Mod_LoadModel(cl_static_entities[i].ent.model, MLV_WARNSYNC);
			if (cl_static_entities[i].ent.model->loadstate == MLS_LOADING)
				COM_WorkerPartialSync(cl_static_entities[i].ent.model, &cl_static_entities[i].ent.model->loadstate, MLS_LOADING);
			VectorAdd(cl_static_entities[i].ent.origin, cl_static_entities[i].ent.model->mins, mins);
			VectorAdd(cl_static_entities[i].ent.origin, cl_static_entities[i].ent.model->maxs, maxs);
		}
		else
		{
			VectorCopy(mins, cl_static_entities[i].ent.origin);
			VectorCopy(maxs, cl_static_entities[i].ent.origin);
		}
		if (cl.worldmodel && cl.worldmodel->loadstate == MLS_LOADED)
			cl.worldmodel->funcs.FindTouchedLeafs(cl.worldmodel, &cl_static_entities[i].ent.pvscache, mins, maxs);
		cl_static_entities[i].emit = NULL;
	}

	CL_InitDlights();
#ifdef RTLIGHTS
	Sh_PreGenerateLights();
#endif
}

void Surf_PreNewMap(void)
{
	r_loadbumpmapping = r_deluxemapping || r_glsl_offsetmapping.ival;
#ifdef RTLIGHTS
	r_loadbumpmapping |= r_shadow_realtime_world.ival || r_shadow_realtime_dlight.ival;
#endif
	r_viewcluster = -1;
	r_oldviewcluster = -1;
	r_viewcluster2 = -1;
	r_oldviewcluster2 = -1;

	Shader_DoReload();
}



static float sgn(float a)
{
    if (a > 0.0F) return (1.0F);
    if (a < 0.0F) return (-1.0F);
    return (0.0F);
}
void R_ObliqueNearClip(float *viewmat, mplane_t *wplane)
{
	float f;
	vec4_t q, c;
	vec3_t ping, pong;
	vec4_t vplane;

	//convert world plane into view space
	Matrix4x4_CM_Transform3x3(viewmat, wplane->normal, vplane);
	VectorScale(wplane->normal, wplane->dist, ping);
	Matrix4x4_CM_Transform3(viewmat, ping, pong);
	vplane[3] = -DotProduct(pong, vplane);

	// Calculate the clip-space corner point opposite the clipping plane
	// as (sgn(clipPlane.x), sgn(clipPlane.y), 1, 1) and
	// transform it into camera space by multiplying it
	// by the inverse of the projection matrix

	q[0] = (sgn(vplane[0]) + r_refdef.m_projection_std[8]) / r_refdef.m_projection_std[0];
	q[1] = (sgn(vplane[1]) + fabs(r_refdef.m_projection_std[9])) / fabs(r_refdef.m_projection_std[5]);
	q[2] = -1.0F;
	q[3] = (1.0F + r_refdef.m_projection_std[10]) / r_refdef.m_projection_std[14];

	// Calculate the scaled plane vector
	f = 2.0F / DotProduct4(vplane, q);
	Vector4Scale(vplane, f, c);

	// Replace the third row of the projection matrix
	r_refdef.m_projection_std[2] = c[0];
	r_refdef.m_projection_std[6] = c[1];
	r_refdef.m_projection_std[10] = c[2] + 1.0F;
	r_refdef.m_projection_std[14] = c[3];
}


#endif