/*
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"
#include "r_shadow.h"
#include "portals.h"

#define MAX_LIGHTMAP_SIZE 256

cvar_t r_ambient = {0, "r_ambient", "0", "brighter world cheat (not allowed in multiplayer), value is 0-128"};
cvar_t r_lockpvs = {0, "r_lockpvs", "0", "disables pvs switching, allows you to walk around and inspect what is visible from a given location in the map (anything not visible from your current location will not be drawn)"};
cvar_t r_lockvisibility = {0, "r_lockvisibility", "0", "disables visibility updates, allows you to walk around and inspect what is visible from a given viewpoint in the map (anything offscreen at the moment this is enabled will not be drawn)"};
cvar_t r_useportalculling = {0, "r_useportalculling", "1", "use advanced portal culling visibility method to improve performance over just Potentially Visible Set, provides an even more significant speed improvement in unvised maps"};
cvar_t r_q3bsp_renderskydepth = {0, "r_q3bsp_renderskydepth", "0", "draws sky depth masking in q3 maps (as in q1 maps), this means for example that sky polygons can hide other things"};

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

Combine and scale multiple lightmaps into the 8.8 format in blocklights
===============
*/
void R_BuildLightMap (const entity_render_t *ent, msurface_t *surface)
{
	int smax, tmax, i, size, size3, maps, l;
	int *bl, scale;
	unsigned char *lightmap, *out, *stain;
	model_t *model = ent->model;
	static int intblocklights[MAX_LIGHTMAP_SIZE*MAX_LIGHTMAP_SIZE*3]; // LordHavoc: *3 for colored lighting
	static unsigned char templight[MAX_LIGHTMAP_SIZE*MAX_LIGHTMAP_SIZE*4];

	// update cached lighting info
	surface->cached_dlight = 0;

	smax = (surface->lightmapinfo->extents[0]>>4)+1;
	tmax = (surface->lightmapinfo->extents[1]>>4)+1;
	size = smax*tmax;
	size3 = size*3;
	lightmap = surface->lightmapinfo->samples;

// set to full bright if no light data
	bl = intblocklights;
	if (!model->brushq1.lightdata)
	{
		for (i = 0;i < size3;i++)
			bl[i] = 255*256;
	}
	else
	{
// clear to no light
		memset(bl, 0, size3*sizeof(*bl));

// add all the lightmaps
		if (lightmap)
			for (maps = 0;maps < MAXLIGHTMAPS && surface->lightmapinfo->styles[maps] != 255;maps++, lightmap += size3)
				for (scale = r_refdef.lightstylevalue[surface->lightmapinfo->styles[maps]], i = 0;i < size3;i++)
					bl[i] += lightmap[i] * scale;
	}

	stain = surface->lightmapinfo->stainsamples;
	bl = intblocklights;
	out = templight;
	// the >> 16 shift adjusts down 8 bits to account for the stainmap
	// scaling, and remaps the 0-65536 (2x overbright) to 0-256, it will
	// be doubled during rendering to achieve 2x overbright
	// (0 = 0.0, 128 = 1.0, 256 = 2.0)
	if (model->brushq1.lightmaprgba)
	{
		for (i = 0;i < size;i++)
		{
			l = (*bl++ * *stain++) >> 16;*out++ = min(l, 255);
			l = (*bl++ * *stain++) >> 16;*out++ = min(l, 255);
			l = (*bl++ * *stain++) >> 16;*out++ = min(l, 255);
			*out++ = 255;
		}
	}
	else
	{
		for (i = 0;i < size;i++)
		{
			l = (*bl++ * *stain++) >> 16;*out++ = min(l, 255);
			l = (*bl++ * *stain++) >> 16;*out++ = min(l, 255);
			l = (*bl++ * *stain++) >> 16;*out++ = min(l, 255);
		}
	}

	R_UpdateTexture(surface->lightmaptexture, templight, surface->lightmapinfo->lightmaporigin[0], surface->lightmapinfo->lightmaporigin[1], smax, tmax);

	// update the surface's deluxemap if it has one
	if (surface->deluxemaptexture != r_texture_blanknormalmap)
	{
		vec3_t n;
		unsigned char *normalmap = surface->lightmapinfo->nmapsamples;
		lightmap = surface->lightmapinfo->samples;
		// clear to no normalmap
		bl = intblocklights;
		memset(bl, 0, size3*sizeof(*bl));
		// add all the normalmaps
		if (lightmap && normalmap)
		{
			for (maps = 0;maps < MAXLIGHTMAPS && surface->lightmapinfo->styles[maps] != 255;maps++, lightmap += size3, normalmap += size3)
			{
				for (scale = r_refdef.lightstylevalue[surface->lightmapinfo->styles[maps]], i = 0;i < size;i++)
				{
					// add the normalmap with weighting proportional to the style's lightmap intensity
					l = (int)(VectorLength(lightmap + i*3) * scale);
					bl[i*3+0] += ((int)normalmap[i*3+0] - 128) * l;
					bl[i*3+1] += ((int)normalmap[i*3+1] - 128) * l;
					bl[i*3+2] += ((int)normalmap[i*3+2] - 128) * l;
				}
			}
		}
		bl = intblocklights;
		out = templight;
		// we simply renormalize the weighted normals to get a valid deluxemap
		if (model->brushq1.lightmaprgba)
		{
			for (i = 0;i < size;i++, bl += 3)
			{
				VectorCopy(bl, n);
				VectorNormalize(n);
				l = (int)(n[0] * 128 + 128);*out++ = bound(0, l, 255);
				l = (int)(n[1] * 128 + 128);*out++ = bound(0, l, 255);
				l = (int)(n[2] * 128 + 128);*out++ = bound(0, l, 255);
				*out++ = 255;
			}
		}
		else
		{
			for (i = 0;i < size;i++, bl += 3)
			{
				VectorCopy(bl, n);
				VectorNormalize(n);
				l = (int)(n[0] * 128 + 128);*out++ = bound(0, l, 255);
				l = (int)(n[1] * 128 + 128);*out++ = bound(0, l, 255);
				l = (int)(n[2] * 128 + 128);*out++ = bound(0, l, 255);
			}
		}
		R_UpdateTexture(surface->deluxemaptexture, templight, surface->lightmapinfo->lightmaporigin[0], surface->lightmapinfo->lightmaporigin[1], smax, tmax);
	}
}

void R_StainNode (mnode_t *node, model_t *model, const vec3_t origin, float radius, const float fcolor[8])
{
	float ndist, a, ratio, maxdist, maxdist2, maxdist3, invradius, sdtable[256], td, dist2;
	msurface_t *surface, *endsurface;
	int i, s, t, smax, tmax, smax3, impacts, impactt, stained;
	unsigned char *bl;
	vec3_t impact;

	maxdist = radius * radius;
	invradius = 1.0f / radius;

loc0:
	if (!node->plane)
		return;
	ndist = PlaneDiff(origin, node->plane);
	if (ndist > radius)
	{
		node = node->children[0];
		goto loc0;
	}
	if (ndist < -radius)
	{
		node = node->children[1];
		goto loc0;
	}

	dist2 = ndist * ndist;
	maxdist3 = maxdist - dist2;

	if (node->plane->type < 3)
	{
		VectorCopy(origin, impact);
		impact[node->plane->type] -= ndist;
	}
	else
	{
		impact[0] = origin[0] - node->plane->normal[0] * ndist;
		impact[1] = origin[1] - node->plane->normal[1] * ndist;
		impact[2] = origin[2] - node->plane->normal[2] * ndist;
	}

	for (surface = model->data_surfaces + node->firstsurface, endsurface = surface + node->numsurfaces;surface < endsurface;surface++)
	{
		if (surface->lightmapinfo->stainsamples)
		{
			smax = (surface->lightmapinfo->extents[0] >> 4) + 1;
			tmax = (surface->lightmapinfo->extents[1] >> 4) + 1;

			impacts = (int)(DotProduct (impact, surface->lightmapinfo->texinfo->vecs[0]) + surface->lightmapinfo->texinfo->vecs[0][3] - surface->lightmapinfo->texturemins[0]);
			impactt = (int)(DotProduct (impact, surface->lightmapinfo->texinfo->vecs[1]) + surface->lightmapinfo->texinfo->vecs[1][3] - surface->lightmapinfo->texturemins[1]);

			s = bound(0, impacts, smax * 16) - impacts;
			t = bound(0, impactt, tmax * 16) - impactt;
			i = (int)(s * s + t * t + dist2);
			if (i > maxdist)
				continue;

			// reduce calculations
			for (s = 0, i = impacts; s < smax; s++, i -= 16)
				sdtable[s] = i * i + dist2;

			bl = surface->lightmapinfo->stainsamples;
			smax3 = smax * 3;
			stained = false;

			i = impactt;
			for (t = 0;t < tmax;t++, i -= 16)
			{
				td = i * i;
				// make sure some part of it is visible on this line
				if (td < maxdist3)
				{
					maxdist2 = maxdist - td;
					for (s = 0;s < smax;s++)
					{
						if (sdtable[s] < maxdist2)
						{
							ratio = lhrandom(0.0f, 1.0f);
							a = (fcolor[3] + ratio * fcolor[7]) * (1.0f - sqrt(sdtable[s] + td) * invradius);
							if (a >= (1.0f / 64.0f))
							{
								if (a > 1)
									a = 1;
								bl[0] = (unsigned char) ((float) bl[0] + a * ((fcolor[0] + ratio * fcolor[4]) - (float) bl[0]));
								bl[1] = (unsigned char) ((float) bl[1] + a * ((fcolor[1] + ratio * fcolor[5]) - (float) bl[1]));
								bl[2] = (unsigned char) ((float) bl[2] + a * ((fcolor[2] + ratio * fcolor[6]) - (float) bl[2]));
								stained = true;
							}
						}
						bl += 3;
					}
				}
				else // skip line
					bl += smax3;
			}
			// force lightmap upload
			if (stained)
				surface->cached_dlight = true;
		}
	}

	if (node->children[0]->plane)
	{
		if (node->children[1]->plane)
		{
			R_StainNode(node->children[0], model, origin, radius, fcolor);
			node = node->children[1];
			goto loc0;
		}
		else
		{
			node = node->children[0];
			goto loc0;
		}
	}
	else if (node->children[1]->plane)
	{
		node = node->children[1];
		goto loc0;
	}
}

void R_Stain (const vec3_t origin, float radius, int cr1, int cg1, int cb1, int ca1, int cr2, int cg2, int cb2, int ca2)
{
	int n;
	float fcolor[8];
	entity_render_t *ent;
	model_t *model;
	vec3_t org;
	if (r_refdef.worldmodel == NULL || !r_refdef.worldmodel->brush.data_nodes || !r_refdef.worldmodel->brushq1.lightdata)
		return;
	fcolor[0] = cr1;
	fcolor[1] = cg1;
	fcolor[2] = cb1;
	fcolor[3] = ca1 * (1.0f / 64.0f);
	fcolor[4] = cr2 - cr1;
	fcolor[5] = cg2 - cg1;
	fcolor[6] = cb2 - cb1;
	fcolor[7] = (ca2 - ca1) * (1.0f / 64.0f);

	R_StainNode(r_refdef.worldmodel->brush.data_nodes + r_refdef.worldmodel->brushq1.hulls[0].firstclipnode, r_refdef.worldmodel, origin, radius, fcolor);

	// look for embedded bmodels
	for (n = 0;n < cl.num_brushmodel_entities;n++)
	{
		ent = &cl.entities[cl.brushmodel_entities[n]].render;
		model = ent->model;
		if (model && model->name[0] == '*')
		{
			if (model->brush.data_nodes)
			{
				Matrix4x4_Transform(&ent->inversematrix, origin, org);
				R_StainNode(model->brush.data_nodes + model->brushq1.hulls[0].firstclipnode, model, org, radius, fcolor);
			}
		}
	}
}


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

	BRUSH MODELS

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

static void R_DrawPortal_Callback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
{
	// due to the hacky nature of this function's parameters, this is never
	// called with a batch, so numsurfaces is always 1, and the surfacelist
	// contains only a leaf number for coloring purposes
	const mportal_t *portal = (mportal_t *)ent;
	int i, numpoints;
	float *v;
	float vertex3f[POLYGONELEMENTS_MAXPOINTS*3];
	CHECKGLERROR
	GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	GL_DepthMask(false);
	GL_DepthTest(true);
	GL_CullFace(GL_NONE);
	R_Mesh_Matrix(&identitymatrix);

	numpoints = min(portal->numpoints, POLYGONELEMENTS_MAXPOINTS);

	R_Mesh_VertexPointer(vertex3f);
	R_Mesh_ColorPointer(NULL);
	R_Mesh_ResetTextureState();

	i = surfacelist[0];
	GL_Color(((i & 0x0007) >> 0) * (1.0f / 7.0f) * r_view.colorscale,
			 ((i & 0x0038) >> 3) * (1.0f / 7.0f) * r_view.colorscale,
			 ((i & 0x01C0) >> 6) * (1.0f / 7.0f) * r_view.colorscale,
			 0.125f);
	for (i = 0, v = vertex3f;i < numpoints;i++, v += 3)
		VectorCopy(portal->points[i].position, v);
	R_Mesh_Draw(0, numpoints, numpoints - 2, polygonelements);
}

// LordHavoc: this is just a nice debugging tool, very slow
void R_DrawPortals(void)
{
	int i, leafnum;
	mportal_t *portal;
	float center[3], f;
	model_t *model = r_refdef.worldmodel;
	if (model == NULL)
		return;
	for (leafnum = 0;leafnum < r_refdef.worldmodel->brush.num_leafs;leafnum++)
	{
		if (r_viewcache.world_leafvisible[leafnum])
		{
			//for (portalnum = 0, portal = model->brush.data_portals;portalnum < model->brush.num_portals;portalnum++, portal++)
			for (portal = r_refdef.worldmodel->brush.data_leafs[leafnum].portals;portal;portal = portal->next)
			{
				if (portal->numpoints <= POLYGONELEMENTS_MAXPOINTS)
				if (!R_CullBox(portal->mins, portal->maxs))
				{
					VectorClear(center);
					for (i = 0;i < portal->numpoints;i++)
						VectorAdd(center, portal->points[i].position, center);
					f = ixtable[portal->numpoints];
					VectorScale(center, f, center);
					R_MeshQueue_AddTransparent(center, R_DrawPortal_Callback, (entity_render_t *)portal, leafnum, r_shadow_rtlight);
				}
			}
		}
	}
}

void R_View_WorldVisibility(void)
{
	int i, j, *mark;
	mleaf_t *leaf;
	mleaf_t *viewleaf;
	model_t *model = r_refdef.worldmodel;

	if (!model)
		return;

	// if possible find the leaf the view origin is in
	viewleaf = model->brush.PointInLeaf ? model->brush.PointInLeaf(model, r_view.origin) : NULL;
	// if possible fetch the visible cluster bits
	if (!r_lockpvs.integer && model->brush.FatPVS)
		model->brush.FatPVS(model, r_view.origin, 2, r_viewcache.world_pvsbits, sizeof(r_viewcache.world_pvsbits));

	if (!r_lockvisibility.integer)
	{
		// clear the visible surface and leaf flags arrays
		memset(r_viewcache.world_surfacevisible, 0, model->num_surfaces);
		memset(r_viewcache.world_leafvisible, 0, model->brush.num_leafs);

		r_viewcache.world_novis = false;

		// if floating around in the void (no pvs data available, and no
		// portals available), simply use all on-screen leafs.
		if (!viewleaf || viewleaf->clusterindex < 0)
		{
			// no visibility method: (used when floating around in the void)
			// simply cull each leaf to the frustum (view pyramid)
			// similar to quake's RecursiveWorldNode but without cache misses
			r_viewcache.world_novis = true;
			for (j = 0, leaf = model->brush.data_leafs;j < model->brush.num_leafs;j++, leaf++)
			{
				// if leaf is in current pvs and on the screen, mark its surfaces
				if (!R_CullBox(leaf->mins, leaf->maxs))
				{
					r_refdef.stats.world_leafs++;
					r_viewcache.world_leafvisible[j] = true;
					if (leaf->numleafsurfaces)
						for (i = 0, mark = leaf->firstleafsurface;i < leaf->numleafsurfaces;i++, mark++)
							r_viewcache.world_surfacevisible[*mark] = true;
				}
			}
		}
		// if the user prefers to disable portal culling (testing?), simply
		// use all on-screen leafs that are in the pvs.
		else if (!r_useportalculling.integer)
		{
			// pvs method:
			// simply check if each leaf is in the Potentially Visible Set,
			// and cull to frustum (view pyramid)
			// similar to quake's RecursiveWorldNode but without cache misses
			for (j = 0, leaf = model->brush.data_leafs;j < model->brush.num_leafs;j++, leaf++)
			{
				// if leaf is in current pvs and on the screen, mark its surfaces
				if (CHECKPVSBIT(r_viewcache.world_pvsbits, leaf->clusterindex) && !R_CullBox(leaf->mins, leaf->maxs))
				{
					r_refdef.stats.world_leafs++;
					r_viewcache.world_leafvisible[j] = true;
					if (leaf->numleafsurfaces)
						for (i = 0, mark = leaf->firstleafsurface;i < leaf->numleafsurfaces;i++, mark++)
							r_viewcache.world_surfacevisible[*mark] = true;
				}
			}
		}
		// otherwise use a recursive portal flow, culling each portal to
		// frustum and checking if the leaf the portal leads to is in the pvs
		else
		{
			int leafstackpos;
			mportal_t *p;
			mleaf_t *leafstack[8192];
			// simple-frustum portal method:
			// follows portals leading outward from viewleaf, does not venture
			// offscreen or into leafs that are not visible, faster than
			// Quake's RecursiveWorldNode and vastly better in unvised maps,
			// often culls some surfaces that pvs alone would miss
			// (such as a room in pvs that is hidden behind a wall, but the
			//  passage leading to the room is off-screen)
			leafstack[0] = viewleaf;
			leafstackpos = 1;
			while (leafstackpos)
			{
				r_refdef.stats.world_leafs++;
				leaf = leafstack[--leafstackpos];
				r_viewcache.world_leafvisible[leaf - model->brush.data_leafs] = true;
				// mark any surfaces bounding this leaf
				if (leaf->numleafsurfaces)
					for (i = 0, mark = leaf->firstleafsurface;i < leaf->numleafsurfaces;i++, mark++)
						r_viewcache.world_surfacevisible[*mark] = true;
				// follow portals into other leafs
				// the checks are:
				// if viewer is behind portal (portal faces outward into the scene)
				// and the portal polygon's bounding box is on the screen
				// and the leaf has not been visited yet
				// and the leaf is visible in the pvs
				// (the first two checks won't cause as many cache misses as the leaf checks)
				for (p = leaf->portals;p;p = p->next)
				{
					r_refdef.stats.world_portals++;
					if (DotProduct(r_view.origin, p->plane.normal) < (p->plane.dist + 1) && !R_CullBox(p->mins, p->maxs) && !r_viewcache.world_leafvisible[p->past - model->brush.data_leafs] && CHECKPVSBIT(r_viewcache.world_pvsbits, p->past->clusterindex))
						leafstack[leafstackpos++] = p->past;
				}
			}
		}
	}
}

void R_Q1BSP_DrawSky(entity_render_t *ent)
{
	if (ent->model == NULL)
		return;
	R_DrawSurfaces(ent, true);
}

void R_Q1BSP_Draw(entity_render_t *ent)
{
	model_t *model = ent->model;
	if (model == NULL)
		return;
	R_DrawSurfaces(ent, false);
}

typedef struct r_q1bsp_getlightinfo_s
{
	model_t *model;
	vec3_t relativelightorigin;
	float lightradius;
	int *outleaflist;
	unsigned char *outleafpvs;
	int outnumleafs;
	int *outsurfacelist;
	unsigned char *outsurfacepvs;
	int outnumsurfaces;
	vec3_t outmins;
	vec3_t outmaxs;
	vec3_t lightmins;
	vec3_t lightmaxs;
	const unsigned char *pvs;
}
r_q1bsp_getlightinfo_t;

void R_Q1BSP_RecursiveGetLightInfo(r_q1bsp_getlightinfo_t *info, mnode_t *node)
{
	int sides;
	mleaf_t *leaf;
	for (;;)
	{
		mplane_t *plane = node->plane;
		//if (!BoxesOverlap(info->lightmins, info->lightmaxs, node->mins, node->maxs))
		//	return;
		if (!plane)
			break;
		if (plane->type < 3)
			sides = ((info->lightmaxs[plane->type] >= plane->dist) | ((info->lightmins[plane->type] < plane->dist) << 1));
		else
			sides = BoxOnPlaneSide(info->lightmins, info->lightmaxs, plane);
		if (sides == 3)
		{
			R_Q1BSP_RecursiveGetLightInfo(info, node->children[0]);
			node = node->children[1];
		}
		else if (sides == 0)
			return; // ERROR: NAN bounding box!
		else
			node = node->children[sides - 1];
	}
	leaf = (mleaf_t *)node;
	if (info->pvs == NULL || CHECKPVSBIT(info->pvs, leaf->clusterindex))
	{
		info->outmins[0] = min(info->outmins[0], leaf->mins[0]);
		info->outmins[1] = min(info->outmins[1], leaf->mins[1]);
		info->outmins[2] = min(info->outmins[2], leaf->mins[2]);
		info->outmaxs[0] = max(info->outmaxs[0], leaf->maxs[0]);
		info->outmaxs[1] = max(info->outmaxs[1], leaf->maxs[1]);
		info->outmaxs[2] = max(info->outmaxs[2], leaf->maxs[2]);
		if (info->outleafpvs)
		{
			int leafindex = leaf - info->model->brush.data_leafs;
			if (!CHECKPVSBIT(info->outleafpvs, leafindex))
			{
				SETPVSBIT(info->outleafpvs, leafindex);
				info->outleaflist[info->outnumleafs++] = leafindex;
			}
		}
		if (info->outsurfacepvs)
		{
			int leafsurfaceindex;
			for (leafsurfaceindex = 0;leafsurfaceindex < leaf->numleafsurfaces;leafsurfaceindex++)
			{
				int surfaceindex = leaf->firstleafsurface[leafsurfaceindex];
				if (!CHECKPVSBIT(info->outsurfacepvs, surfaceindex))
				{
					msurface_t *surface = info->model->data_surfaces + surfaceindex;
					if (BoxesOverlap(info->lightmins, info->lightmaxs, surface->mins, surface->maxs))
					{
						int triangleindex, t;
						const int *e;
						const vec_t *v[3];
						for (triangleindex = 0, t = surface->num_firstshadowmeshtriangle, e = info->model->brush.shadowmesh->element3i + t * 3;triangleindex < surface->num_triangles;triangleindex++, t++, e += 3)
						{
							v[0] = info->model->brush.shadowmesh->vertex3f + e[0] * 3;
							v[1] = info->model->brush.shadowmesh->vertex3f + e[1] * 3;
							v[2] = info->model->brush.shadowmesh->vertex3f + e[2] * 3;
							if (PointInfrontOfTriangle(info->relativelightorigin, v[0], v[1], v[2]) && info->lightmaxs[0] > min(v[0][0], min(v[1][0], v[2][0])) && info->lightmins[0] < max(v[0][0], max(v[1][0], v[2][0])) && info->lightmaxs[1] > min(v[0][1], min(v[1][1], v[2][1])) && info->lightmins[1] < max(v[0][1], max(v[1][1], v[2][1])) && info->lightmaxs[2] > min(v[0][2], min(v[1][2], v[2][2])) && info->lightmins[2] < max(v[0][2], max(v[1][2], v[2][2])))
							{
								SETPVSBIT(info->outsurfacepvs, surfaceindex);
								info->outsurfacelist[info->outnumsurfaces++] = surfaceindex;
								break;
							}
						}
					}
				}
			}
		}
	}
}

void R_Q1BSP_GetLightInfo(entity_render_t *ent, vec3_t relativelightorigin, float lightradius, vec3_t outmins, vec3_t outmaxs, int *outleaflist, unsigned char *outleafpvs, int *outnumleafspointer, int *outsurfacelist, unsigned char *outsurfacepvs, int *outnumsurfacespointer)
{
	r_q1bsp_getlightinfo_t info;
	VectorCopy(relativelightorigin, info.relativelightorigin);
	info.lightradius = lightradius;
	info.lightmins[0] = info.relativelightorigin[0] - info.lightradius;
	info.lightmins[1] = info.relativelightorigin[1] - info.lightradius;
	info.lightmins[2] = info.relativelightorigin[2] - info.lightradius;
	info.lightmaxs[0] = info.relativelightorigin[0] + info.lightradius;
	info.lightmaxs[1] = info.relativelightorigin[1] + info.lightradius;
	info.lightmaxs[2] = info.relativelightorigin[2] + info.lightradius;
	if (ent->model == NULL)
	{
		VectorCopy(info.lightmins, outmins);
		VectorCopy(info.lightmaxs, outmaxs);
		*outnumleafspointer = 0;
		*outnumsurfacespointer = 0;
		return;
	}
	info.model = ent->model;
	info.outleaflist = outleaflist;
	info.outleafpvs = outleafpvs;
	info.outnumleafs = 0;
	info.outsurfacelist = outsurfacelist;
	info.outsurfacepvs = outsurfacepvs;
	info.outnumsurfaces = 0;
	VectorCopy(info.relativelightorigin, info.outmins);
	VectorCopy(info.relativelightorigin, info.outmaxs);
	memset(outleafpvs, 0, (info.model->brush.num_leafs + 7) >> 3);
	memset(outsurfacepvs, 0, (info.model->nummodelsurfaces + 7) >> 3);
	if (info.model->brush.GetPVS)
		info.pvs = info.model->brush.GetPVS(info.model, info.relativelightorigin);
	else
		info.pvs = NULL;
	R_UpdateAllTextureInfo(ent);
	if (r_shadow_compilingrtlight)
	{
		// use portal recursion for exact light volume culling, and exact surface checking
		Portal_Visibility(info.model, info.relativelightorigin, info.outleaflist, info.outleafpvs, &info.outnumleafs, info.outsurfacelist, info.outsurfacepvs, &info.outnumsurfaces, NULL, 0, true, info.lightmins, info.lightmaxs, info.outmins, info.outmaxs);
	}
	else if (r_shadow_realtime_dlight_portalculling.integer)
	{
		// use portal recursion for exact light volume culling, but not the expensive exact surface checking
		Portal_Visibility(info.model, info.relativelightorigin, info.outleaflist, info.outleafpvs, &info.outnumleafs, info.outsurfacelist, info.outsurfacepvs, &info.outnumsurfaces, NULL, 0, r_shadow_realtime_dlight_portalculling.integer >= 2, info.lightmins, info.lightmaxs, info.outmins, info.outmaxs);
	}
	else
	{
		// use BSP recursion as lights are often small
		R_Q1BSP_RecursiveGetLightInfo(&info, info.model->brush.data_nodes);
	}

	// limit combined leaf box to light boundaries
	outmins[0] = max(info.outmins[0] - 1, info.lightmins[0]);
	outmins[1] = max(info.outmins[1] - 1, info.lightmins[1]);
	outmins[2] = max(info.outmins[2] - 1, info.lightmins[2]);
	outmaxs[0] = min(info.outmaxs[0] + 1, info.lightmaxs[0]);
	outmaxs[1] = min(info.outmaxs[1] + 1, info.lightmaxs[1]);
	outmaxs[2] = min(info.outmaxs[2] + 1, info.lightmaxs[2]);

	*outnumleafspointer = info.outnumleafs;
	*outnumsurfacespointer = info.outnumsurfaces;
}

void R_Q1BSP_CompileShadowVolume(entity_render_t *ent, vec3_t relativelightorigin, vec3_t relativelightdirection, float lightradius, int numsurfaces, const int *surfacelist)
{
	model_t *model = ent->model;
	msurface_t *surface;
	int surfacelistindex;
	float projectdistance = relativelightdirection ? lightradius : lightradius + model->radius*2 + r_shadow_projectdistance.value;
	texture_t *texture;
	r_shadow_compilingrtlight->static_meshchain_shadow = Mod_ShadowMesh_Begin(r_main_mempool, 32768, 32768, NULL, NULL, NULL, false, false, true);
	R_Shadow_PrepareShadowMark(model->brush.shadowmesh->numtriangles);
	for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
	{
		surface = model->data_surfaces + surfacelist[surfacelistindex];
		texture = surface->texture;
		if ((texture->basematerialflags & (MATERIALFLAG_NODRAW | MATERIALFLAG_TRANSPARENT | MATERIALFLAG_WALL)) != MATERIALFLAG_WALL)
			continue;
		if ((texture->textureflags & (Q3TEXTUREFLAG_TWOSIDED | Q3TEXTUREFLAG_AUTOSPRITE | Q3TEXTUREFLAG_AUTOSPRITE2)) || (ent->flags & RENDER_NOCULLFACE))
			continue;
		R_Shadow_MarkVolumeFromBox(surface->num_firstshadowmeshtriangle, surface->num_triangles, model->brush.shadowmesh->vertex3f, model->brush.shadowmesh->element3i, relativelightorigin, relativelightdirection, r_shadow_compilingrtlight->cullmins, r_shadow_compilingrtlight->cullmaxs, surface->mins, surface->maxs);
	}
	R_Shadow_VolumeFromList(model->brush.shadowmesh->numverts, model->brush.shadowmesh->numtriangles, model->brush.shadowmesh->vertex3f, model->brush.shadowmesh->element3i, model->brush.shadowmesh->neighbor3i, relativelightorigin, relativelightdirection, projectdistance, numshadowmark, shadowmarklist);
	r_shadow_compilingrtlight->static_meshchain_shadow = Mod_ShadowMesh_Finish(r_main_mempool, r_shadow_compilingrtlight->static_meshchain_shadow, false, false);
}

void R_Q1BSP_DrawShadowVolume_Batch(const vec3_t relativelightorigin, const vec3_t relativelightdirection, const vec3_t lightmins, const vec3_t lightmaxs, int texturenumsurfaces, msurface_t **texturesurfacelist)
{
	int texturesurfaceindex;
	RSurf_PrepareVerticesForBatch(false, false, texturenumsurfaces, texturesurfacelist);
	for (texturesurfaceindex = 0;texturesurfaceindex < texturenumsurfaces;texturesurfaceindex++)
	{
		msurface_t *surface = texturesurfacelist[texturesurfaceindex];
		R_Shadow_MarkVolumeFromBox(surface->num_firsttriangle, surface->num_triangles, rsurface_vertex3f, rsurface_model->surfmesh.data_element3i, relativelightorigin, relativelightdirection, lightmins, lightmaxs, surface->mins, surface->maxs);
	}
}

void R_Q1BSP_DrawShadowVolume(entity_render_t *ent, vec3_t relativelightorigin, vec3_t relativelightdirection, float lightradius, int modelnumsurfaces, const int *modelsurfacelist, const vec3_t lightmins, const vec3_t lightmaxs)
{
	model_t *model = ent->model;
	msurface_t *surface;
	int modelsurfacelistindex;
	int f = 0;
	float projectdistance = relativelightdirection ? lightradius : lightradius + model->radius*2 + r_shadow_projectdistance.value;
	texture_t *t = NULL;
	const int maxsurfacelist = 1024;
	int numsurfacelist = 0;
	msurface_t *surfacelist[1024];
	// check the box in modelspace, it was already checked in worldspace
	if (!BoxesOverlap(model->normalmins, model->normalmaxs, lightmins, lightmaxs))
		return;
	R_UpdateAllTextureInfo(ent);
	if (model->brush.shadowmesh)
	{
		R_Shadow_PrepareShadowMark(model->brush.shadowmesh->numtriangles);
		for (modelsurfacelistindex = 0;modelsurfacelistindex < modelnumsurfaces;modelsurfacelistindex++)
		{
			surface = model->data_surfaces + modelsurfacelist[modelsurfacelistindex];
			t = surface->texture->currentframe;
			if ((t->currentmaterialflags & (MATERIALFLAG_NODRAW | MATERIALFLAG_TRANSPARENT | MATERIALFLAG_WALL)) != MATERIALFLAG_WALL)
				continue;
			if ((t->textureflags & (Q3TEXTUREFLAG_TWOSIDED | Q3TEXTUREFLAG_AUTOSPRITE | Q3TEXTUREFLAG_AUTOSPRITE2)) || (ent->flags & RENDER_NOCULLFACE))
				continue;
			R_Shadow_MarkVolumeFromBox(surface->num_firstshadowmeshtriangle, surface->num_triangles, model->brush.shadowmesh->vertex3f, model->brush.shadowmesh->element3i, relativelightorigin, relativelightdirection, lightmins, lightmaxs, surface->mins, surface->maxs);
		}
		R_Shadow_VolumeFromList(model->brush.shadowmesh->numverts, model->brush.shadowmesh->numtriangles, model->brush.shadowmesh->vertex3f, model->brush.shadowmesh->element3i, model->brush.shadowmesh->neighbor3i, relativelightorigin, relativelightdirection, projectdistance, numshadowmark, shadowmarklist);
	}
	else
	{
		projectdistance = lightradius + model->radius*2;
		RSurf_ActiveEntity(ent, false, false);
		R_Shadow_PrepareShadowMark(model->surfmesh.num_triangles);
		// identify lit faces within the bounding box
		for (modelsurfacelistindex = 0;modelsurfacelistindex < modelnumsurfaces;modelsurfacelistindex++)
		{
			surface = model->data_surfaces + modelsurfacelist[modelsurfacelistindex];
			if (t != surface->texture || numsurfacelist >= maxsurfacelist)
			{
				if (numsurfacelist)
				{
					R_Q1BSP_DrawShadowVolume_Batch(relativelightorigin, relativelightdirection, lightmins, lightmaxs, numsurfacelist, surfacelist);
					numsurfacelist = 0;
				}
				t = surface->texture;
				rsurface_texture = t->currentframe;
				f = (rsurface_texture->currentmaterialflags & (MATERIALFLAG_NODRAW | MATERIALFLAG_TRANSPARENT | MATERIALFLAG_WALL)) == MATERIALFLAG_WALL;
			}
			if (f && surface->num_triangles)
				surfacelist[numsurfacelist++] = surface;
		}
		if (numsurfacelist)
			R_Q1BSP_DrawShadowVolume_Batch(relativelightorigin, relativelightdirection, lightmins, lightmaxs, numsurfacelist, surfacelist);
		R_Shadow_VolumeFromList(model->surfmesh.num_vertices, model->surfmesh.num_triangles, rsurface_vertex3f, model->surfmesh.data_element3i, model->surfmesh.data_neighbor3i, relativelightorigin, relativelightdirection, projectdistance, numshadowmark, shadowmarklist);
	}
}

#define BATCHSIZE 256

static void R_Q1BSP_DrawLight_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
{
	int surfacelistindex, batchcount;
	texture_t *t;
	msurface_t *batchsurfaces[BATCHSIZE];
	// note: in practice this never actually batches, oh well
	R_Shadow_RenderMode_Begin();
	R_Shadow_RenderMode_ActiveLight((rtlight_t *)rtlight);
	R_Shadow_RenderMode_Lighting(false, true);
	R_Shadow_SetupEntityLight(ent);
	t = NULL;
	batchcount = 0;
	for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
	{
		msurface_t *surface = ent->model->data_surfaces + surfacelist[surfacelistindex];
		if (t != surface->texture)
		{
			if (batchcount > 0)
				R_Shadow_RenderSurfacesLighting(batchcount, batchsurfaces);
			batchcount = 0;
			t = surface->texture;
			R_UpdateTextureInfo(ent, t);
			rsurface_texture = t->currentframe;
		}
		batchsurfaces[batchcount++] = surface;
	}
	if (batchcount > 0)
		R_Shadow_RenderSurfacesLighting(batchcount, batchsurfaces);
	R_Shadow_RenderMode_End();
}

static void R_Q1BSP_DrawLight_TransparentBatch(int batchnumsurfaces, msurface_t **batchsurfacelist)
{
	int batchsurfaceindex;
	msurface_t *batchsurface;
	vec3_t tempcenter, center;
	for (batchsurfaceindex = 0;batchsurfaceindex < batchnumsurfaces;batchsurfaceindex++)
	{
		batchsurface = batchsurfacelist[batchsurfaceindex];
		tempcenter[0] = (batchsurface->mins[0] + batchsurface->maxs[0]) * 0.5f;
		tempcenter[1] = (batchsurface->mins[1] + batchsurface->maxs[1]) * 0.5f;
		tempcenter[2] = (batchsurface->mins[2] + batchsurface->maxs[2]) * 0.5f;
		Matrix4x4_Transform(&rsurface_entity->matrix, tempcenter, center);
		R_MeshQueue_AddTransparent(rsurface_texture->currentmaterialflags & MATERIALFLAG_NODEPTHTEST ? r_view.origin : center, R_Q1BSP_DrawLight_TransparentCallback, rsurface_entity, batchsurface - rsurface_model->data_surfaces, r_shadow_rtlight);
	}
}

#define RSURF_MAX_BATCHSURFACES 1024

void R_Q1BSP_DrawLight(entity_render_t *ent, int numsurfaces, const int *surfacelist)
{
	model_t *model = ent->model;
	msurface_t *surface;
	int surfacelistindex, batchnumsurfaces;
	msurface_t *batchsurfacelist[RSURF_MAX_BATCHSURFACES];
	texture_t *tex;
	qboolean skip;
	CHECKGLERROR
	RSurf_ActiveEntity(ent, true, true);
	R_UpdateAllTextureInfo(ent);
	tex = NULL;
	rsurface_texture = NULL;
	skip = false;
	batchnumsurfaces = 0;
	CHECKGLERROR
	for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
	{
		if ((ent == r_refdef.worldentity && !r_viewcache.world_surfacevisible[surfacelist[surfacelistindex]]))
			continue;
		surface = model->data_surfaces + surfacelist[surfacelistindex];
		r_refdef.stats.lights_lighttriangles += surface->num_triangles;
		if (tex != surface->texture)
		{
			if (batchnumsurfaces > 0)
			{
				if (rsurface_texture->currentmaterialflags & MATERIALFLAG_BLENDED)
					R_Q1BSP_DrawLight_TransparentBatch(batchnumsurfaces, batchsurfacelist);
				else
					R_Shadow_RenderSurfacesLighting(batchnumsurfaces, batchsurfacelist);
				batchnumsurfaces = 0;
			}
			tex = surface->texture;
			rsurface_texture = surface->texture->currentframe;
			skip = (rsurface_texture->currentmaterialflags & MATERIALFLAG_SKY) != 0;
			if (skip)
				continue;
		}
		if (!skip && surface->num_triangles)
		{
			if (batchnumsurfaces == RSURF_MAX_BATCHSURFACES)
			{
				if (rsurface_texture->currentmaterialflags & MATERIALFLAG_BLENDED)
					R_Q1BSP_DrawLight_TransparentBatch(batchnumsurfaces, batchsurfacelist);
				else
					R_Shadow_RenderSurfacesLighting(batchnumsurfaces, batchsurfacelist);
				batchnumsurfaces = 0;
			}
			batchsurfacelist[batchnumsurfaces++] = surface;
		}
	}
	if (batchnumsurfaces > 0)
	{
		if (rsurface_texture->currentmaterialflags & MATERIALFLAG_BLENDED)
			R_Q1BSP_DrawLight_TransparentBatch(batchnumsurfaces, batchsurfacelist);
		else
			R_Shadow_RenderSurfacesLighting(batchnumsurfaces, batchsurfacelist);
		batchnumsurfaces = 0;
	}
}

//Made by [515]
void R_ReplaceWorldTexture (void)
{
	model_t		*m;
	texture_t	*t;
	int			i;
	const char	*r, *newt;
	m = r_refdef.worldmodel;

	if(Cmd_Argc() < 2)
	{
		Con_Print("r_replacemaptexture <texname> <newtexname> - replaces texture\n");
		Con_Print("r_replacemaptexture <texname> - switch back to default texture\n");
		return;
	}
	if(!cl.islocalgame || !cl.worldmodel)
	{
		Con_Print("This command works only in singleplayer\n");
		return;
	}
	r = Cmd_Argv(1);
	newt = Cmd_Argv(2);
	if(!newt[0])
		newt = r;
	for(i=0,t=m->data_textures;i<m->num_textures;i++,t++)
	{
		if(t->width && !strcasecmp(t->name, r))
		{
			if(Mod_LoadSkinFrame(&t->skinframes[0], (char*)newt, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE | TEXF_PICMIP, false, r_fullbrights.integer))
			{
				Con_Printf("%s replaced with %s\n", r, newt);
				return;
			}
			else
			{
				Con_Printf("%s was not found\n", newt);
				Mod_LoadSkinFrame(&t->skinframes[0], (char*)r, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE | TEXF_PICMIP, false, r_fullbrights.integer);//back to default
				return;
			}
		}
	}
}

//Made by [515]
void R_ListWorldTextures (void)
{
	model_t		*m;
	texture_t	*t;
	int			i;
	m = r_refdef.worldmodel;

	Con_Print("Worldmodel textures :\n");
	for(i=0,t=m->data_textures;i<m->num_textures;i++,t++)
		if (t->numskinframes)
			Con_Printf("%s\n", t->name);
}

#if 0
static void gl_surf_start(void)
{
}

static void gl_surf_shutdown(void)
{
}

static void gl_surf_newmap(void)
{
}
#endif

void GL_Surf_Init(void)
{

	Cvar_RegisterVariable(&r_ambient);
	Cvar_RegisterVariable(&r_lockpvs);
	Cvar_RegisterVariable(&r_lockvisibility);
	Cvar_RegisterVariable(&r_useportalculling);
	Cvar_RegisterVariable(&r_q3bsp_renderskydepth);

	Cmd_AddCommand ("r_replacemaptexture", R_ReplaceWorldTexture, "override a map texture for testing purposes");	// By [515]
	Cmd_AddCommand ("r_listmaptextures", R_ListWorldTextures, "list all textures used by the current map");	// By [515]

	//R_RegisterModule("GL_Surf", gl_surf_start, gl_surf_shutdown, gl_surf_newmap);
}