gl_rsurf.c

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/*
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"
#include "csprogs.h"
#include "image.h"
 
cvar_t r_ambient = {CF_CLIENT, "r_ambient", "0", "brightens map, value is 0-128"};
cvar_t r_lockpvs = {CF_CLIENT, "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 = {CF_CLIENT, "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 = {CF_CLIENT, "r_useportalculling", "1", "improve framerate with r_novis 1 by using portal culling - still not as good as compiled visibility data in the map, but it helps (a value of 2 forces use of this even with vis data, which improves framerates in maps without too much complexity, but hurts in extremely complex maps, which is why 2 is not the default mode)"};
cvar_t r_usesurfaceculling = {CF_CLIENT, "r_usesurfaceculling", "1", "skip off-screen surfaces (1 = cull surfaces if the map is likely to benefit, 2 = always cull surfaces)"};
cvar_t r_vis_trace = {CF_CLIENT, "r_vis_trace", "0", "test if each portal or leaf is visible using tracelines"};
cvar_t r_vis_trace_samples = {CF_CLIENT, "r_vis_trace_samples", "1", "use this many randomly positioned tracelines each frame to refresh the visible timer"};
cvar_t r_vis_trace_delay = {CF_CLIENT, "r_vis_trace_delay", "1", "keep a portal visible for this many seconds"};
cvar_t r_vis_trace_eyejitter = {CF_CLIENT, "r_vis_trace_eyejitter", "8", "use a random offset of this much on the start of each traceline"};
cvar_t r_vis_trace_enlarge = {CF_CLIENT, "r_vis_trace_enlarge", "0", "make portal bounds bigger for tests by (1+this)*size"};
cvar_t r_vis_trace_expand = {CF_CLIENT, "r_vis_trace_expand", "0", "make portal bounds bigger for tests by this many units"};
cvar_t r_vis_trace_pad = {CF_CLIENT, "r_vis_trace_pad", "8", "accept traces that hit within this many units of the portal"};
cvar_t r_vis_trace_surfaces = {CF_CLIENT, "r_vis_trace_surfaces", "0", "also use tracelines to cull surfaces"};
cvar_t r_q3bsp_renderskydepth = {CF_CLIENT, "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 combine)
{
    int smax, tmax, i, size, size3, maps, l;
    int *bl, scale;
    unsigned char *lightmap, *out, *stain;
    model_t *model = ent->model;
    int *intblocklights;
    unsigned char *templight;
 
    smax = (surface->lightmapinfo->extents[0]>>4)+1;
    tmax = (surface->lightmapinfo->extents[1]>>4)+1;
    size = smax*tmax;
    size3 = size*3;
 
    r_refdef.stats[r_stat_lightmapupdatepixels] += size;
    r_refdef.stats[r_stat_lightmapupdates]++;
 
    if (cl.buildlightmapmemorysize < size*sizeof(int[3]))
    {
        cl.buildlightmapmemorysize = size*sizeof(int[3]);
        if (cl.buildlightmapmemory)
            Mem_Free(cl.buildlightmapmemory);
        cl.buildlightmapmemory = (unsigned char *) Mem_Alloc(cls.levelmempool, cl.buildlightmapmemorysize);
    }
 
    // these both point at the same buffer, templight is only used for final
    // processing and can replace the intblocklights data as it goes
    intblocklights = (int *)cl.buildlightmapmemory;
    templight = (unsigned char *)cl.buildlightmapmemory;
 
    // update cached lighting info
    model->brushq1.lightmapupdateflags[surface - model->data_surfaces] = false;
 
    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] = 128*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.scene.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 (stain)
    {
        for (i = 0;i < size;i++, bl += 3, stain += 3, out += 4)
        {
            l = (bl[0] * stain[0]) >> 16;out[2] = min(l, 255);
            l = (bl[1] * stain[1]) >> 16;out[1] = min(l, 255);
            l = (bl[2] * stain[2]) >> 16;out[0] = min(l, 255);
            out[3] = 255;
        }
    }
    else
    {
        for (i = 0;i < size;i++, bl += 3, out += 4)
        {
            l = bl[0] >> 8;out[2] = min(l, 255);
            l = bl[1] >> 8;out[1] = min(l, 255);
            l = bl[2] >> 8;out[0] = min(l, 255);
            out[3] = 255;
        }
    }
 
    if(vid_sRGB.integer && vid_sRGB_fallback.integer && !vid.sRGB3D)
        Image_MakesRGBColorsFromLinear_Lightmap(templight, templight, size);
    R_UpdateTexture(surface->lightmaptexture, templight, surface->lightmapinfo->lightmaporigin[0], surface->lightmapinfo->lightmaporigin[1], 0, smax, tmax, 1, combine);
 
    // 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.scene.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
        for (i = 0;i < size;i++, bl += 3, out += 4)
        {
            VectorCopy(bl, n);
            VectorNormalize(n);
            l = (int)(n[0] * 128 + 128);out[2] = bound(0, l, 255);
            l = (int)(n[1] * 128 + 128);out[1] = bound(0, l, 255);
            l = (int)(n[2] * 128 + 128);out[0] = bound(0, l, 255);
            out[3] = 255;
        }
        R_UpdateTexture(surface->deluxemaptexture, templight, surface->lightmapinfo->lightmaporigin[0], surface->lightmapinfo->lightmaporigin[1], 0, smax, tmax, 1, r_q1bsp_lightmap_updates_combine.integer);
    }
}
 
static 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) || (smax > (int)(sizeof(sdtable)/sizeof(sdtable[0])))) // smax overflow fix from Andreas Dehmel
                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)
                model->brushq1.lightmapupdateflags[surface - model->data_surfaces] = 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.scene.worldmodel == NULL || !r_refdef.scene.worldmodel->brush.data_nodes || !r_refdef.scene.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.scene.worldmodel->brush.data_nodes + r_refdef.scene.worldmodel->brushq1.hulls[0].firstclipnode, r_refdef.scene.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;
    qbool isvis;
    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_DepthRange(0, 1);
    GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
    GL_DepthTest(true);
    GL_CullFace(GL_NONE);
    R_EntityMatrix(&identitymatrix);
 
    numpoints = min(portal->numpoints, POLYGONELEMENTS_MAXPOINTS);
 
//  R_Mesh_ResetTextureState();
 
    isvis = (portal->here->clusterindex >= 0 && portal->past->clusterindex >= 0 && portal->here->clusterindex != portal->past->clusterindex);
 
    i = surfacelist[0] >> 1;
    GL_Color(((i & 0x0007) >> 0) * (1.0f / 7.0f) * r_refdef.view.colorscale,
             ((i & 0x0038) >> 3) * (1.0f / 7.0f) * r_refdef.view.colorscale,
             ((i & 0x01C0) >> 6) * (1.0f / 7.0f) * r_refdef.view.colorscale,
             isvis ? 0.125f : 0.03125f);
    for (i = 0, v = vertex3f;i < numpoints;i++, v += 3)
        VectorCopy(portal->points[i].position, v);
    R_Mesh_PrepareVertices_Generic_Arrays(numpoints, vertex3f, NULL, NULL);
    R_SetupShader_Generic_NoTexture(false, false);
    R_Mesh_Draw(0, numpoints, 0, numpoints - 2, polygonelement3i, NULL, 0, polygonelement3s, NULL, 0);
}
 
// LadyHavoc: 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.scene.worldmodel;
    if (model == NULL)
        return;
    for (leafnum = 0;leafnum < model->brush.num_leafs;leafnum++)
    {
        if (r_refdef.viewcache.world_leafvisible[leafnum])
        {
            //for (portalnum = 0, portal = model->brush.data_portals;portalnum < model->brush.num_portals;portalnum++, portal++)
            for (portal = model->brush.data_leafs[leafnum].portals;portal;portal = portal->next)
            {
                if (portal->numpoints <= POLYGONELEMENTS_MAXPOINTS)
                if (!R_CullFrustum(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(TRANSPARENTSORT_DISTANCE, center, R_DrawPortal_Callback, (entity_render_t *)portal, leafnum, rsurface.rtlight);
                }
            }
        }
    }
}
 
static void R_View_WorldVisibility_CullSurfaces(void)
{
    int surfaceindex;
    unsigned char *surfacevisible;
    msurface_t *surfaces;
    model_t *model = r_refdef.scene.worldmodel;
    if (!model)
        return;
    if (r_trippy.integer)
        return;
    if (r_usesurfaceculling.integer < 1)
        return;
    surfaces = model->data_surfaces;
    surfacevisible = r_refdef.viewcache.world_surfacevisible;
    for (surfaceindex = model->submodelsurfaces_start; surfaceindex < model->submodelsurfaces_end; surfaceindex++)
    {
        if (surfacevisible[surfaceindex])
        {
            if (R_CullFrustum(surfaces[surfaceindex].mins, surfaces[surfaceindex].maxs)
             || (r_vis_trace_surfaces.integer && !R_CanSeeBox(r_vis_trace_samples.integer, r_vis_trace_eyejitter.value, r_vis_trace_enlarge.value, r_vis_trace_expand.value, r_vis_trace_pad.value, r_refdef.view.origin, surfaces[surfaceindex].mins, surfaces[surfaceindex].maxs)))
                surfacevisible[surfaceindex] = 0;
        }
    }
}
 
void R_View_WorldVisibility(qbool forcenovis)
{
    int i, j, *mark;
    mleaf_t *leaf;
    mleaf_t *viewleaf;
    model_t *model = r_refdef.scene.worldmodel;
 
    if (!model)
        return;
 
    if (r_lockvisibility.integer)
        return;
 
    // clear the visible surface and leaf flags arrays
    memset(r_refdef.viewcache.world_surfacevisible, 0, model->num_surfaces);
    if(!r_lockpvs.integer)
        memset(r_refdef.viewcache.world_leafvisible, 0, model->brush.num_leafs);
 
    r_refdef.viewcache.world_novis = false;
 
    if (r_refdef.view.usecustompvs)
    {
        // simply cull each marked leaf to the frustum (view pyramid)
        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_refdef.viewcache.world_pvsbits, leaf->clusterindex) && !R_CullFrustum(leaf->mins, leaf->maxs))
            {
                r_refdef.stats[r_stat_world_leafs]++;
                r_refdef.viewcache.world_leafvisible[j] = true;
                if (leaf->numleafsurfaces)
                    for (i = 0, mark = leaf->firstleafsurface;i < leaf->numleafsurfaces;i++, mark++)
                        r_refdef.viewcache.world_surfacevisible[*mark] = true;
            }
        }
    }
    else
    {
        // if possible find the leaf the view origin is in
        viewleaf = model->brush.PointInLeaf ? model->brush.PointInLeaf(model, r_refdef.view.origin) : NULL;
        // if possible fetch the visible cluster bits
        if (!r_lockpvs.integer && model->brush.FatPVS)
            model->brush.FatPVS(model, r_refdef.view.origin, 2, &r_refdef.viewcache.world_pvsbits, r_main_mempool, 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 || forcenovis || !r_refdef.view.usevieworiginculling)
        {
            // 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_refdef.viewcache.world_novis = true;
            for (j = 0, leaf = model->brush.data_leafs;j < model->brush.num_leafs;j++, leaf++)
            {
                if (leaf->clusterindex < 0)
                    continue;
                // if leaf is in current pvs and on the screen, mark its surfaces
                if (!R_CullFrustum(leaf->mins, leaf->maxs))
                {
                    r_refdef.stats[r_stat_world_leafs]++;
                    r_refdef.viewcache.world_leafvisible[j] = true;
                    if (leaf->numleafsurfaces)
                        for (i = 0, mark = leaf->firstleafsurface;i < leaf->numleafsurfaces;i++, mark++)
                            r_refdef.viewcache.world_surfacevisible[*mark] = true;
                }
            }
        }
        // just check if each leaf in the PVS is on screen
        // (unless portal culling is enabled)
        else if (!model->brush.data_portals || r_useportalculling.integer < 1 || (r_useportalculling.integer < 2 && !r_novis.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->clusterindex < 0)
                    continue;
                // if leaf is in current pvs and on the screen, mark its surfaces
                if (CHECKPVSBIT(r_refdef.viewcache.world_pvsbits, leaf->clusterindex) && !R_CullFrustum(leaf->mins, leaf->maxs))
                {
                    r_refdef.stats[r_stat_world_leafs]++;
                    r_refdef.viewcache.world_leafvisible[j] = true;
                    if (leaf->numleafsurfaces)
                        for (i = 0, mark = leaf->firstleafsurface;i < leaf->numleafsurfaces;i++, mark++)
                            r_refdef.viewcache.world_surfacevisible[*mark] = true;
                }
            }
        }
        // if desired 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];
            vec3_t cullmins, cullmaxs;
            float cullbias = r_nearclip.value * 2.0f; // the nearclip plane can easily end up culling portals in certain perfectly-aligned views, causing view blackouts
            // 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)
            {
                leaf = leafstack[--leafstackpos];
                if (r_refdef.viewcache.world_leafvisible[leaf - model->brush.data_leafs])
                    continue;
                if (leaf->clusterindex < 0)
                    continue;
                r_refdef.stats[r_stat_world_leafs]++;
                r_refdef.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_refdef.viewcache.world_surfacevisible[*mark] = true;
                // follow portals into other leafs
                // the checks are:
                // the leaf has not been visited yet
                // and the leaf is visible in the pvs
                // the portal polygon's bounding box is on the screen
                for (p = leaf->portals;p;p = p->next)
                {
                    r_refdef.stats[r_stat_world_portals]++;
                    if (r_refdef.viewcache.world_leafvisible[p->past - model->brush.data_leafs])
                        continue;
                    if (!CHECKPVSBIT(r_refdef.viewcache.world_pvsbits, p->past->clusterindex))
                        continue;
                    cullmins[0] = p->mins[0] - cullbias;
                    cullmins[1] = p->mins[1] - cullbias;
                    cullmins[2] = p->mins[2] - cullbias;
                    cullmaxs[0] = p->maxs[0] + cullbias;
                    cullmaxs[1] = p->maxs[1] + cullbias;
                    cullmaxs[2] = p->maxs[2] + cullbias;
                    if (R_CullFrustum(cullmins, cullmaxs))
                        continue;
                    if (r_vis_trace.integer)
                    {
                        if (p->tracetime != host.realtime && R_CanSeeBox(r_vis_trace_samples.value, r_vis_trace_eyejitter.value, r_vis_trace_enlarge.value, r_vis_trace_expand.value, r_vis_trace_pad.value, r_refdef.view.origin, cullmins, cullmaxs))
                            p->tracetime = host.realtime;
                        if (host.realtime - p->tracetime > r_vis_trace_delay.value)
                            continue;
                    }
                    if (leafstackpos >= (int)(sizeof(leafstack) / sizeof(leafstack[0])))
                        break;
                    leafstack[leafstackpos++] = p->past;
                }
            }
        }
    }
 
    // Cull the rest
    R_View_WorldVisibility_CullSurfaces();
}
 
void R_Mod_DrawSky(entity_render_t *ent)
{
    if (ent->model == NULL)
        return;
    R_DrawModelSurfaces(ent, true, true, false, false, false, false);
}
 
void R_Mod_DrawAddWaterPlanes(entity_render_t *ent)
{
    int i, n, flagsmask;
    model_t *model = ent->model;
    msurface_t *surfaces;
    if (model == NULL)
        return;
 
    RSurf_ActiveModelEntity(ent, true, false, false);
 
    surfaces = model->data_surfaces;
    flagsmask = MATERIALFLAG_WATERSHADER | MATERIALFLAG_REFRACTION | MATERIALFLAG_REFLECTION | MATERIALFLAG_CAMERA;
 
    // add visible surfaces to draw list
    if (ent == r_refdef.scene.worldentity)
    {
        for (i = model->submodelsurfaces_start;i < model->submodelsurfaces_end;i++)
            if (r_refdef.viewcache.world_surfacevisible[i])
                if (surfaces[i].texture->basematerialflags & flagsmask)
                    R_Water_AddWaterPlane(surfaces + i, 0);
    }
    else
    {
        if(ent->entitynumber >= MAX_EDICTS) // && CL_VM_TransformView(ent->entitynumber - MAX_EDICTS, NULL, NULL, NULL))
            n = ent->entitynumber;
        else
            n = 0;
        for (i = model->submodelsurfaces_start;i < model->submodelsurfaces_end;i++)
            if (surfaces[i].texture->basematerialflags & flagsmask)
                R_Water_AddWaterPlane(surfaces + i, n);
    }
    rsurface.entity = NULL; // used only by R_GetCurrentTexture and RSurf_ActiveModelEntity
}
 
void R_Mod_Draw(entity_render_t *ent)
{
    model_t *model = ent->model;
    if (model == NULL)
        return;
    R_DrawModelSurfaces(ent, false, true, false, false, false, false);
}
 
void R_Mod_DrawDepth(entity_render_t *ent)
{
    model_t *model = ent->model;
    if (model == NULL || model->surfmesh.isanimated)
        return;
    GL_ColorMask(0,0,0,0);
    GL_Color(1,1,1,1);
    GL_DepthTest(true);
    GL_BlendFunc(GL_ONE, GL_ZERO);
    GL_DepthMask(true);
//  R_Mesh_ResetTextureState();
    R_DrawModelSurfaces(ent, false, false, true, false, false, false);
    GL_ColorMask(r_refdef.view.colormask[0], r_refdef.view.colormask[1], r_refdef.view.colormask[2], 1);
}
 
void R_Mod_DrawDebug(entity_render_t *ent)
{
    if (ent->model == NULL)
        return;
    R_DrawModelSurfaces(ent, false, false, false, true, false, false);
}
 
void R_Mod_DrawPrepass(entity_render_t *ent)
{
    model_t *model = ent->model;
    if (model == NULL)
        return;
    R_DrawModelSurfaces(ent, false, true, false, false, true, false);
}
 
typedef struct r_q1bsp_getlightinfo_s
{
    model_t *model;
    vec3_t relativelightorigin;
    float lightradius;
    int *outleaflist;
    unsigned char *outleafpvs;
    int outnumleafs;
    unsigned char *visitingleafpvs;
    int *outsurfacelist;
    unsigned char *outsurfacepvs;
    unsigned char *tempsurfacepvs;
    unsigned char *outshadowtrispvs;
    unsigned char *outlighttrispvs;
    int outnumsurfaces;
    vec3_t outmins;
    vec3_t outmaxs;
    vec3_t lightmins;
    vec3_t lightmaxs;
    const unsigned char *pvs;
    qbool svbsp_active;
    qbool svbsp_insertoccluder;
    qbool noocclusion; // avoids PVS culling
    qbool frontsidecasting; // casts shadows from surfaces facing the light (otherwise ones facing away)
    int numfrustumplanes;
    const mplane_t *frustumplanes;
}
r_q1bsp_getlightinfo_t;
 
#define GETLIGHTINFO_MAXNODESTACK 4096
 
static void R_Q1BSP_RecursiveGetLightInfo_BSP(r_q1bsp_getlightinfo_t *info, qbool skipsurfaces)
{
    // nodestack
    mnode_t *nodestack[GETLIGHTINFO_MAXNODESTACK];
    int nodestackpos = 0;
    // node processing
    mplane_t *plane;
    mnode_t *node;
    int sides;
    // leaf processing
    mleaf_t *leaf;
    const msurface_t *surface;
    const msurface_t *surfaces = info->model->data_surfaces;
    int numleafsurfaces;
    int leafsurfaceindex;
    int surfaceindex;
    int triangleindex, t;
    int currentmaterialflags;
    qbool castshadow;
    const int *e;
    const vec_t *v[3];
    float v2[3][3];
    qbool insidebox;
    qbool noocclusion = info->noocclusion;
    qbool frontsidecasting = info->frontsidecasting;
    qbool svbspactive = info->svbsp_active;
    qbool svbspinsertoccluder = info->svbsp_insertoccluder;
    const int *leafsurfaceindices;
    qbool addedtris;
    int i;
    mportal_t *portal;
    static float points[128][3];
    // push the root node onto our nodestack
    nodestack[nodestackpos++] = info->model->brush.data_nodes;
    // we'll be done when the nodestack is empty
    while (nodestackpos)
    {
        // get a node from the stack to process
        node = nodestack[--nodestackpos];
        // is it a node or a leaf?
        plane = node->plane;
        if (plane)
        {
            // node
#if 0
            if (!BoxesOverlap(info->lightmins, info->lightmaxs, node->mins, node->maxs))
                continue;
#endif
#if 0
            if (!r_shadow_compilingrtlight && R_CullBox(node->mins, node->maxs, rtlight->cached_numfrustumplanes, rtlight->cached_frustumplanes))
                continue;
#endif
            // axial planes can be processed much more quickly
            if (plane->type < 3)
            {
                // axial plane
                if (info->lightmins[plane->type] > plane->dist)
                    nodestack[nodestackpos++] = node->children[0];
                else if (info->lightmaxs[plane->type] < plane->dist)
                    nodestack[nodestackpos++] = node->children[1];
                else
                {
                    // recurse front side first because the svbsp building prefers it
                    if (info->relativelightorigin[plane->type] >= plane->dist)
                    {
                        if (nodestackpos < GETLIGHTINFO_MAXNODESTACK-1)
                            nodestack[nodestackpos++] = node->children[0];
                        nodestack[nodestackpos++] = node->children[1];
                    }
                    else
                    {
                        if (nodestackpos < GETLIGHTINFO_MAXNODESTACK-1)
                            nodestack[nodestackpos++] = node->children[1];
                        nodestack[nodestackpos++] = node->children[0];
                    }
                }
            }
            else
            {
                // sloped plane
                sides = BoxOnPlaneSide(info->lightmins, info->lightmaxs, plane);
                switch (sides)
                {
                default:
                    continue; // ERROR: NAN bounding box!
                case 1:
                    nodestack[nodestackpos++] = node->children[0];
                    break;
                case 2:
                    nodestack[nodestackpos++] = node->children[1];
                    break;
                case 3:
                    // recurse front side first because the svbsp building prefers it
                    if (PlaneDist(info->relativelightorigin, plane) >= 0)
                    {
                        if (nodestackpos < GETLIGHTINFO_MAXNODESTACK-1)
                            nodestack[nodestackpos++] = node->children[0];
                        nodestack[nodestackpos++] = node->children[1];
                    }
                    else
                    {
                        if (nodestackpos < GETLIGHTINFO_MAXNODESTACK-1)
                            nodestack[nodestackpos++] = node->children[1];
                        nodestack[nodestackpos++] = node->children[0];
                    }
                    break;
                }
            }
        }
        else
        {
            // leaf
            leaf = (mleaf_t *)node;
#if 1
            if (!info->noocclusion && info->pvs != NULL && !CHECKPVSBIT(info->pvs, leaf->clusterindex))
                continue;
#endif
#if 1
            if (!BoxesOverlap(info->lightmins, info->lightmaxs, leaf->mins, leaf->maxs))
                continue;
#endif
#if 1
            if (!r_shadow_compilingrtlight && R_CullBox(leaf->mins, leaf->maxs, info->numfrustumplanes, info->frustumplanes))
                continue;
#endif
 
            if (svbspactive)
            {
                // we can occlusion test the leaf by checking if all of its portals
                // are occluded (unless the light is in this leaf - but that was
                // already handled by the caller)
                for (portal = leaf->portals;portal;portal = portal->next)
                {
                    for (i = 0;i < portal->numpoints;i++)
                        VectorCopy(portal->points[i].position, points[i]);
                    if (SVBSP_AddPolygon(&r_svbsp, portal->numpoints, points[0], false, NULL, NULL, 0) & 2)
                        break;
                }
                if (leaf->portals && portal == NULL)
                    continue; // no portals of this leaf visible
            }
 
            // add this leaf to the reduced light bounds
            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]);
 
            // mark this leaf as being visible to the light
            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;
                }
            }
 
            // when using BIH, we skip the surfaces here
            if (skipsurfaces)
                continue;
 
            // iterate the surfaces linked by this leaf and check their triangles
            leafsurfaceindices = leaf->firstleafsurface;
            numleafsurfaces = leaf->numleafsurfaces;
            if (svbspinsertoccluder)
            {
                for (leafsurfaceindex = 0;leafsurfaceindex < numleafsurfaces;leafsurfaceindex++)
                {
                    surfaceindex = leafsurfaceindices[leafsurfaceindex];
                    if (CHECKPVSBIT(info->outsurfacepvs, surfaceindex))
                        continue;
                    SETPVSBIT(info->outsurfacepvs, surfaceindex);
                    surface = surfaces + surfaceindex;
                    if (!BoxesOverlap(info->lightmins, info->lightmaxs, surface->mins, surface->maxs))
                        continue;
                    currentmaterialflags = R_GetCurrentTexture(surface->texture)->currentmaterialflags;
                    castshadow = !(currentmaterialflags & MATERIALFLAG_NOSHADOW);
                    if (!castshadow)
                        continue;
                    insidebox = BoxInsideBox(surface->mins, surface->maxs, info->lightmins, info->lightmaxs);
                    for (triangleindex = 0, t = surface->num_firsttriangle, e = info->model->surfmesh.data_element3i + t * 3;triangleindex < surface->num_triangles;triangleindex++, t++, e += 3)
                    {
                        v[0] = info->model->surfmesh.data_vertex3f + e[0] * 3;
                        v[1] = info->model->surfmesh.data_vertex3f + e[1] * 3;
                        v[2] = info->model->surfmesh.data_vertex3f + e[2] * 3;
                        VectorCopy(v[0], v2[0]);
                        VectorCopy(v[1], v2[1]);
                        VectorCopy(v[2], v2[2]);
                        if (insidebox || TriangleBBoxOverlapsBox(v2[0], v2[1], v2[2], info->lightmins, info->lightmaxs))
                            SVBSP_AddPolygon(&r_svbsp, 3, v2[0], true, NULL, NULL, 0);
                    }
                }
            }
            else
            {
                for (leafsurfaceindex = 0;leafsurfaceindex < numleafsurfaces;leafsurfaceindex++)
                {
                    surfaceindex = leafsurfaceindices[leafsurfaceindex];
                    surface = surfaces + surfaceindex;
                    if(!surface->texture)
                        continue;   
                    if (CHECKPVSBIT(info->outsurfacepvs, surfaceindex))
                        continue;
                    SETPVSBIT(info->outsurfacepvs, surfaceindex);
                    if (!BoxesOverlap(info->lightmins, info->lightmaxs, surface->mins, surface->maxs))
                        continue;
                    addedtris = false;
                    currentmaterialflags = R_GetCurrentTexture(surface->texture)->currentmaterialflags;
                    castshadow = !(currentmaterialflags & MATERIALFLAG_NOSHADOW);
                    insidebox = BoxInsideBox(surface->mins, surface->maxs, info->lightmins, info->lightmaxs);
                    for (triangleindex = 0, t = surface->num_firsttriangle, e = info->model->surfmesh.data_element3i + t * 3;triangleindex < surface->num_triangles;triangleindex++, t++, e += 3)
                    {
                        v[0] = info->model->surfmesh.data_vertex3f + e[0] * 3;
                        v[1] = info->model->surfmesh.data_vertex3f + e[1] * 3;
                        v[2] = info->model->surfmesh.data_vertex3f + e[2] * 3;
                        VectorCopy(v[0], v2[0]);
                        VectorCopy(v[1], v2[1]);
                        VectorCopy(v[2], v2[2]);
                        if (!insidebox && !TriangleBBoxOverlapsBox(v2[0], v2[1], v2[2], info->lightmins, info->lightmaxs))
                            continue;
                        if (svbspactive && !(SVBSP_AddPolygon(&r_svbsp, 3, v2[0], false, NULL, NULL, 0) & 2))
                            continue;
                        // we don't omit triangles from lighting even if they are
                        // backfacing, because when using shadowmapping they are often
                        // not fully occluded on the horizon of an edge
                        SETPVSBIT(info->outlighttrispvs, t);
                        addedtris = true;
                        if (castshadow)
                        {
                            if (noocclusion || (currentmaterialflags & MATERIALFLAG_NOCULLFACE))
                            {
                                // if the material is double sided we
                                // can't cull by direction
                                SETPVSBIT(info->outshadowtrispvs, t);
                            }
                            else if (frontsidecasting)
                            {
                                // front side casting occludes backfaces,
                                // so they are completely useless as both
                                // casters and lit polygons
                                if (PointInfrontOfTriangle(info->relativelightorigin, v2[0], v2[1], v2[2]))
                                    SETPVSBIT(info->outshadowtrispvs, t);
                            }
                            else
                            {
                                // back side casting does not occlude
                                // anything so we can't cull lit polygons
                                if (!PointInfrontOfTriangle(info->relativelightorigin, v2[0], v2[1], v2[2]))
                                    SETPVSBIT(info->outshadowtrispvs, t);
                            }
                        }
                    }
                    if (addedtris)
                        info->outsurfacelist[info->outnumsurfaces++] = surfaceindex;
                }
            }
        }
    }
}
 
static void R_Q1BSP_RecursiveGetLightInfo_BIH(r_q1bsp_getlightinfo_t *info, const bih_t *bih)
{
    bih_leaf_t *leaf;
    bih_node_t *node;
    int nodenum;
    int axis;
    int surfaceindex;
    int t;
    int nodeleafindex;
    int currentmaterialflags;
    qbool castshadow;
    qbool noocclusion = info->noocclusion;
    qbool frontsidecasting = info->frontsidecasting;
    msurface_t *surface;
    const int *e;
    const vec_t *v[3];
    float v2[3][3];
    int nodestack[GETLIGHTINFO_MAXNODESTACK];
    int nodestackpos = 0;
    // note: because the BSP leafs are not in the BIH tree, the _BSP function
    // must be called to mark leafs visible for entity culling...
    // we start at the root node
    nodestack[nodestackpos++] = bih->rootnode;
    // we'll be done when the stack is empty
    while (nodestackpos)
    {
        // pop one off the stack to process
        nodenum = nodestack[--nodestackpos];
        // node
        node = bih->nodes + nodenum;
        if (node->type == BIH_UNORDERED)
        {
            for (nodeleafindex = 0;nodeleafindex < BIH_MAXUNORDEREDCHILDREN && node->children[nodeleafindex] >= 0;nodeleafindex++)
            {
                leaf = bih->leafs + node->children[nodeleafindex];
                if (leaf->type != BIH_RENDERTRIANGLE)
                    continue;
#if 1
                if (!BoxesOverlap(info->lightmins, info->lightmaxs, leaf->mins, leaf->maxs))
                    continue;
#endif
#if 1
                if (!r_shadow_compilingrtlight && R_CullBox(leaf->mins, leaf->maxs, info->numfrustumplanes, info->frustumplanes))
                    continue;
#endif
                surfaceindex = leaf->surfaceindex;
                surface = info->model->data_surfaces + surfaceindex;
                currentmaterialflags = R_GetCurrentTexture(surface->texture)->currentmaterialflags;
                castshadow = !(currentmaterialflags & MATERIALFLAG_NOSHADOW);
                t = leaf->itemindex;
                e = info->model->surfmesh.data_element3i + t * 3;
                v[0] = info->model->surfmesh.data_vertex3f + e[0] * 3;
                v[1] = info->model->surfmesh.data_vertex3f + e[1] * 3;
                v[2] = info->model->surfmesh.data_vertex3f + e[2] * 3;
                VectorCopy(v[0], v2[0]);
                VectorCopy(v[1], v2[1]);
                VectorCopy(v[2], v2[2]);
                if (info->svbsp_insertoccluder)
                {
                    if (castshadow)
                        SVBSP_AddPolygon(&r_svbsp, 3, v2[0], true, NULL, NULL, 0);
                    continue;
                }
                if (info->svbsp_active && !(SVBSP_AddPolygon(&r_svbsp, 3, v2[0], false, NULL, NULL, 0) & 2))
                    continue;
                // we don't occlude triangles from lighting even
                // if they are backfacing, because when using
                // shadowmapping they are often not fully occluded
                // on the horizon of an edge
                SETPVSBIT(info->outlighttrispvs, t);
                if (castshadow)
                {
                    if (noocclusion || (currentmaterialflags & MATERIALFLAG_NOCULLFACE))
                    {
                        // if the material is double sided we
                        // can't cull by direction
                        SETPVSBIT(info->outshadowtrispvs, t);
                    }
                    else if (frontsidecasting)
                    {
                        // front side casting occludes backfaces,
                        // so they are completely useless as both
                        // casters and lit polygons
                        if (PointInfrontOfTriangle(info->relativelightorigin, v2[0], v2[1], v2[2]))
                            SETPVSBIT(info->outshadowtrispvs, t);
                    }
                    else
                    {
                        // back side casting does not occlude
                        // anything so we can't cull lit polygons
                        if (!PointInfrontOfTriangle(info->relativelightorigin, v2[0], v2[1], v2[2]))
                            SETPVSBIT(info->outshadowtrispvs, t);
                    }
                }
                if (!CHECKPVSBIT(info->outsurfacepvs, surfaceindex))
                {
                    SETPVSBIT(info->outsurfacepvs, surfaceindex);
                    info->outsurfacelist[info->outnumsurfaces++] = surfaceindex;
                }
            }
        }
        else
        {
            axis = node->type - BIH_SPLITX;
#if 0
            if (!BoxesOverlap(info->lightmins, info->lightmaxs, node->mins, node->maxs))
                continue;
#endif
#if 0
            if (!r_shadow_compilingrtlight && R_CullBox(node->mins, node->maxs, rtlight->cached_numfrustumplanes, rtlight->cached_frustumplanes))
                continue;
#endif
            if (info->lightmins[axis] <= node->backmax)
            {
                if (info->lightmaxs[axis] >= node->frontmin && nodestackpos < GETLIGHTINFO_MAXNODESTACK-1)
                    nodestack[nodestackpos++] = node->front;
                nodestack[nodestackpos++] = node->back;
                continue;
            }
            else if (info->lightmaxs[axis] >= node->frontmin)
            {
                nodestack[nodestackpos++] = node->front;
                continue;
            }
            else
                continue; // light falls between children, nothing here
        }
    }
}
 
static void R_Q1BSP_CallRecursiveGetLightInfo(r_q1bsp_getlightinfo_t *info, qbool use_svbsp)
{
    extern cvar_t r_shadow_usebihculling;
    if (use_svbsp)
    {
        float origin[3];
        VectorCopy(info->relativelightorigin, origin);
        r_svbsp.maxnodes = max(r_svbsp.maxnodes, 1<<12);
        r_svbsp.nodes = (svbsp_node_t*) R_FrameData_Alloc(r_svbsp.maxnodes * sizeof(svbsp_node_t));
        info->svbsp_active = true;
        info->svbsp_insertoccluder = true;
        for (;;)
        {
            SVBSP_Init(&r_svbsp, origin, r_svbsp.maxnodes, r_svbsp.nodes);
            R_Q1BSP_RecursiveGetLightInfo_BSP(info, false);
            // if that failed, retry with more nodes
            if (r_svbsp.ranoutofnodes)
            {
                // an upper limit is imposed
                if (r_svbsp.maxnodes >= 2<<22)
                    break;
                r_svbsp.maxnodes *= 2;
                r_svbsp.nodes = (svbsp_node_t*) R_FrameData_Alloc(r_svbsp.maxnodes * sizeof(svbsp_node_t));
                //Mem_Free(r_svbsp.nodes);
                //r_svbsp.nodes = (svbsp_node_t*) Mem_Alloc(tempmempool, r_svbsp.maxnodes * sizeof(svbsp_node_t));
            }
            else
                break;
        }
        // now clear the visibility arrays because we need to redo it
        info->outnumleafs = 0;
        info->outnumsurfaces = 0;
        memset(info->outleafpvs, 0, (info->model->brush.num_leafs + 7) >> 3);
        memset(info->outsurfacepvs, 0, (info->model->num_surfaces + 7) >> 3);
        memset(info->outshadowtrispvs, 0, (info->model->surfmesh.num_triangles + 7) >> 3);
        memset(info->outlighttrispvs, 0, (info->model->surfmesh.num_triangles + 7) >> 3);
    }
    else
        info->svbsp_active = false;
 
    // we HAVE to mark the leaf the light is in as lit, because portals are
    // irrelevant to a leaf that the light source is inside of
    // (and they are all facing away, too)
    {
        mnode_t *node = info->model->brush.data_nodes;
        mleaf_t *leaf;
        while (node->plane)
            node = node->children[(node->plane->type < 3 ? info->relativelightorigin[node->plane->type] : DotProduct(info->relativelightorigin,node->plane->normal)) < node->plane->dist];
        leaf = (mleaf_t *)node;
        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;
            }
        }
    }
 
    info->svbsp_insertoccluder = false;
    // use BIH culling on single leaf maps (generally this only happens if running a model as a map), otherwise use BSP culling to make use of vis data
    if (r_shadow_usebihculling.integer > 0 && (r_shadow_usebihculling.integer == 2 || info->model->brush.num_leafs == 1) && info->model->render_bih.leafs != NULL)
    {
        R_Q1BSP_RecursiveGetLightInfo_BSP(info, true);
        R_Q1BSP_RecursiveGetLightInfo_BIH(info, &info->model->render_bih);
    }
    else
        R_Q1BSP_RecursiveGetLightInfo_BSP(info, false);
    // we're using temporary framedata memory, so this pointer will be invalid soon, clear it
    r_svbsp.nodes = NULL;
    if (developer_extra.integer && use_svbsp)
    {
        Con_DPrintf("GetLightInfo: svbsp built with %i nodes, polygon stats:\n", r_svbsp.numnodes);
        Con_DPrintf("occluders: %i accepted, %i rejected, %i fragments accepted, %i fragments rejected.\n", r_svbsp.stat_occluders_accepted, r_svbsp.stat_occluders_rejected, r_svbsp.stat_occluders_fragments_accepted, r_svbsp.stat_occluders_fragments_rejected);
        Con_DPrintf("queries  : %i accepted, %i rejected, %i fragments accepted, %i fragments rejected.\n", r_svbsp.stat_queries_accepted, r_svbsp.stat_queries_rejected, r_svbsp.stat_queries_fragments_accepted, r_svbsp.stat_queries_fragments_rejected);
    }
}
 
static msurface_t *r_q1bsp_getlightinfo_surfaces;
 
static int R_Q1BSP_GetLightInfo_comparefunc(const void *ap, const void *bp)
{
    int a = *(int*)ap;
    int b = *(int*)bp;
    const msurface_t *as = r_q1bsp_getlightinfo_surfaces + a;
    const msurface_t *bs = r_q1bsp_getlightinfo_surfaces + b;
    if (as->texture < bs->texture)
        return -1;
    if (as->texture > bs->texture)
        return 1;
    return a - b;
}
 
extern cvar_t r_shadow_sortsurfaces;
 
void R_Mod_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, unsigned char *outshadowtrispvs, unsigned char *outlighttrispvs, unsigned char *visitingleafpvs, int numfrustumplanes, const mplane_t *frustumplanes, qbool noocclusion)
{
    r_q1bsp_getlightinfo_t info;
    info.frontsidecasting = r_shadow_frontsidecasting.integer != 0;
    info.noocclusion = noocclusion || !info.frontsidecasting;
    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.visitingleafpvs = visitingleafpvs;
    info.outsurfacelist = outsurfacelist;
    info.outsurfacepvs = outsurfacepvs;
    info.outshadowtrispvs = outshadowtrispvs;
    info.outlighttrispvs = outlighttrispvs;
    info.outnumsurfaces = 0;
    info.numfrustumplanes = numfrustumplanes;
    info.frustumplanes = frustumplanes;
    VectorCopy(info.relativelightorigin, info.outmins);
    VectorCopy(info.relativelightorigin, info.outmaxs);
    memset(visitingleafpvs, 0, (info.model->brush.num_leafs + 7) >> 3);
    memset(outleafpvs, 0, (info.model->brush.num_leafs + 7) >> 3);
    memset(outsurfacepvs, 0, (info.model->num_surfaces + 7) >> 3);
    memset(outshadowtrispvs, 0, (info.model->surfmesh.num_triangles + 7) >> 3);
    memset(outlighttrispvs, 0, (info.model->surfmesh.num_triangles + 7) >> 3);
    if (info.model->brush.GetPVS && !info.noocclusion)
        info.pvs = info.model->brush.GetPVS(info.model, info.relativelightorigin);
    else
        info.pvs = NULL;
    RSurf_ActiveModelEntity(r_refdef.scene.worldentity, false, false, false);
 
    if (!info.noocclusion && r_shadow_compilingrtlight && r_shadow_realtime_world_compileportalculling.integer && info.model->brush.data_portals)
    {
        // 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, info.outshadowtrispvs, info.outlighttrispvs, info.visitingleafpvs);
    }
    else if (!info.noocclusion && r_shadow_realtime_dlight_portalculling.integer && info.model->brush.data_portals)
    {
        // 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, info.outshadowtrispvs, info.outlighttrispvs, info.visitingleafpvs);
    }
    else
    {
        // recurse the bsp tree, checking leafs and surfaces for visibility
        // optionally using svbsp for exact culling of compiled lights
        // (or if the user enables dlight svbsp culling, which is mostly for
        //  debugging not actual use)
        R_Q1BSP_CallRecursiveGetLightInfo(&info, !info.noocclusion && (r_shadow_compilingrtlight ? r_shadow_realtime_world_compilesvbsp.integer : r_shadow_realtime_dlight_svbspculling.integer) != 0);
    }
 
    rsurface.entity = NULL; // used only by R_GetCurrentTexture and RSurf_ActiveModelEntity
 
    // 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;
 
    // now sort surfaces by texture for faster rendering
    r_q1bsp_getlightinfo_surfaces = info.model->data_surfaces;
    if (r_shadow_sortsurfaces.integer)
        qsort(info.outsurfacelist, info.outnumsurfaces, sizeof(*info.outsurfacelist), R_Q1BSP_GetLightInfo_comparefunc);
}
 
void R_Mod_CompileShadowMap(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;
    int sidetotals[6] = { 0, 0, 0, 0, 0, 0 }, sidemasks = 0;
    int i;
    // FIXME: the sidetotals code incorrectly assumes that static_meshchain is
    // a single mesh - to prevent that from crashing (sideoffsets, sidetotals
    // exceeding the number of triangles in a single mesh) we have to make sure
    // that we make only a single mesh - so over-estimate the size of the mesh
    // to match the model.
    // bones_was_here: +128 works around BUG https://github.com/DarkPlacesEngine/darkplaces/issues/119
    // +64 was enough to start the map without triggering ASan, +96 was enough to also edit the light.
    // See also: warning in Mod_ShadowMesh_AddMesh
    r_shadow_compilingrtlight->static_meshchain_shadow_shadowmap = Mod_ShadowMesh_Begin(r_main_mempool, model->surfmesh.num_vertices, model->surfmesh.num_triangles + 128);
    R_Shadow_PrepareShadowSides(model->surfmesh.num_triangles);
    for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
    {
        surface = model->data_surfaces + surfacelist[surfacelistindex];
        sidemasks |= R_Shadow_ChooseSidesFromBox(surface->num_firsttriangle, surface->num_triangles, model->surfmesh.data_vertex3f, model->surfmesh.data_element3i, &r_shadow_compilingrtlight->matrix_worldtolight, relativelightorigin, relativelightdirection, r_shadow_compilingrtlight->cullmins, r_shadow_compilingrtlight->cullmaxs, surface->mins, surface->maxs, surface->texture->basematerialflags & MATERIALFLAG_NOSHADOW ? NULL : sidetotals);
    }
    R_Shadow_ShadowMapFromList(model->surfmesh.num_vertices, model->surfmesh.num_triangles, model->surfmesh.data_vertex3f, model->surfmesh.data_element3i, numshadowsides, sidetotals, shadowsides, shadowsideslist);
    r_shadow_compilingrtlight->static_meshchain_shadow_shadowmap = Mod_ShadowMesh_Finish(r_shadow_compilingrtlight->static_meshchain_shadow_shadowmap, true);
    r_shadow_compilingrtlight->static_shadowmap_receivers &= sidemasks;
    for(i = 0;i<6;i++)
        if(!sidetotals[i])
            r_shadow_compilingrtlight->static_shadowmap_casters &= ~(1 << i);
}
 
#define RSURF_MAX_BATCHSURFACES 8192
 
static const msurface_t *batchsurfacelist[RSURF_MAX_BATCHSURFACES];
 
void R_Mod_DrawShadowMap(int side, entity_render_t *ent, const vec3_t relativelightorigin, const vec3_t relativelightdirection, float lightradius, int modelnumsurfaces, const int *modelsurfacelist, const unsigned char *surfacesides, const vec3_t lightmins, const vec3_t lightmaxs)
{
    model_t *model = ent->model;
    const msurface_t *surface;
    int modelsurfacelistindex, batchnumsurfaces;
    // check the box in modelspace, it was already checked in worldspace
    if (!BoxesOverlap(model->normalmins, model->normalmaxs, lightmins, lightmaxs))
        return;
    R_FrameData_SetMark();
    // identify lit faces within the bounding box
    for (modelsurfacelistindex = 0;modelsurfacelistindex < modelnumsurfaces;modelsurfacelistindex++)
    {
        surface = model->data_surfaces + modelsurfacelist[modelsurfacelistindex];
        if (surfacesides && !(surfacesides[modelsurfacelistindex] & (1 << side)))
            continue;
        rsurface.texture = R_GetCurrentTexture(surface->texture);
        if (rsurface.texture->currentmaterialflags & MATERIALFLAG_NOSHADOW)
            continue;
        if (!BoxesOverlap(lightmins, lightmaxs, surface->mins, surface->maxs))
            continue;
        r_refdef.stats[r_stat_lights_dynamicshadowtriangles] += surface->num_triangles;
        r_refdef.stats[r_stat_lights_shadowtriangles] += surface->num_triangles;
        batchsurfacelist[0] = surface;
        batchnumsurfaces = 1;
        while(++modelsurfacelistindex < modelnumsurfaces && batchnumsurfaces < RSURF_MAX_BATCHSURFACES)
        {
            surface = model->data_surfaces + modelsurfacelist[modelsurfacelistindex];
            if (surfacesides && !(surfacesides[modelsurfacelistindex] & (1 << side)))
                continue;
            if (surface->texture != batchsurfacelist[0]->texture)
                break;
            if (!BoxesOverlap(lightmins, lightmaxs, surface->mins, surface->maxs))
                continue;
            r_refdef.stats[r_stat_lights_dynamicshadowtriangles] += surface->num_triangles;
            r_refdef.stats[r_stat_lights_shadowtriangles] += surface->num_triangles;
            batchsurfacelist[batchnumsurfaces++] = surface;
        }
        --modelsurfacelistindex;
        GL_CullFace(rsurface.texture->currentmaterialflags & MATERIALFLAG_NOCULLFACE ? GL_NONE : r_refdef.view.cullface_back);
        RSurf_PrepareVerticesForBatch(BATCHNEED_ARRAY_VERTEX | BATCHNEED_ALLOWMULTIDRAW, batchnumsurfaces, batchsurfacelist);
        R_Mesh_PrepareVertices_Vertex3f(rsurface.batchnumvertices, rsurface.batchvertex3f, rsurface.batchvertex3f_vertexbuffer, rsurface.batchvertex3f_bufferoffset);
        RSurf_DrawBatch();
    }
    R_FrameData_ReturnToMark();
}
 
#define BATCHSIZE 1024
 
static void R_Q1BSP_DrawLight_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
{
    int i, j, endsurface;
    texture_t *t;
    const msurface_t *surface;
    R_FrameData_SetMark();
    // note: in practice this never actually receives batches
    R_Shadow_RenderMode_Begin();
    R_Shadow_RenderMode_ActiveLight(rtlight);
    R_Shadow_RenderMode_Lighting(true, rtlight->shadowmapatlassidesize != 0, (ent->flags & RENDER_NOSELFSHADOW) != 0);
    R_Shadow_SetupEntityLight(ent);
    for (i = 0;i < numsurfaces;i = j)
    {
        j = i + 1;
        surface = rsurface.modelsurfaces + surfacelist[i];
        t = surface->texture;
        rsurface.texture = R_GetCurrentTexture(t);
        endsurface = min(j + BATCHSIZE, numsurfaces);
        for (j = i;j < endsurface;j++)
        {
            surface = rsurface.modelsurfaces + surfacelist[j];
            if (t != surface->texture)
                break;
            R_Shadow_RenderLighting(1, &surface);
        }
    }
    R_Shadow_RenderMode_End();
    R_FrameData_ReturnToMark();
}
 
extern qbool r_shadow_usingdeferredprepass;
void R_Mod_DrawLight(entity_render_t *ent, int numsurfaces, const int *surfacelist, const unsigned char *lighttrispvs)
{
    model_t *model = ent->model;
    const msurface_t *surface;
    int i, k, kend, l, endsurface, batchnumsurfaces, texturenumsurfaces;
    const msurface_t **texturesurfacelist;
    texture_t *tex;
    CHECKGLERROR
    R_FrameData_SetMark();
    // this is a double loop because non-visible surface skipping has to be
    // fast, and even if this is not the world model (and hence no visibility
    // checking) the input surface list and batch buffer are different formats
    // so some processing is necessary.  (luckily models have few surfaces)
    for (i = 0;i < numsurfaces;)
    {
        batchnumsurfaces = 0;
        endsurface = min(i + RSURF_MAX_BATCHSURFACES, numsurfaces);
        if (ent == r_refdef.scene.worldentity)
        {
            for (;i < endsurface;i++)
                if (r_refdef.viewcache.world_surfacevisible[surfacelist[i]])
                    batchsurfacelist[batchnumsurfaces++] = model->data_surfaces + surfacelist[i];
        }
        else
        {
            for (;i < endsurface;i++)
                batchsurfacelist[batchnumsurfaces++] = model->data_surfaces + surfacelist[i];
        }
        if (!batchnumsurfaces)
            continue;
        for (k = 0;k < batchnumsurfaces;k = kend)
        {
            surface = batchsurfacelist[k];
            tex = surface->texture;
            rsurface.texture = R_GetCurrentTexture(tex);
            // gather surfaces into a batch range
            for (kend = k;kend < batchnumsurfaces && tex == batchsurfacelist[kend]->texture;kend++)
                ;
            // now figure out what to do with this particular range of surfaces
            // VorteX: added MATERIALFLAG_NORTLIGHT
            if ((rsurface.texture->currentmaterialflags & (MATERIALFLAG_WALL | MATERIALFLAG_NORTLIGHT)) != MATERIALFLAG_WALL)
                continue;
            if (r_fb.water.renderingscene && (rsurface.texture->currentmaterialflags & (MATERIALFLAG_WATERSHADER | MATERIALFLAG_REFRACTION | MATERIALFLAG_REFLECTION | MATERIALFLAG_CAMERA)))
                continue;
            if (rsurface.texture->currentmaterialflags & MATERIALFLAGMASK_DEPTHSORTED)
            {
                vec3_t tempcenter, center;
                for (l = k;l < kend;l++)
                {
                    surface = batchsurfacelist[l];
                    if (r_transparent_sortsurfacesbynearest.integer)
                    {
                        tempcenter[0] = bound(surface->mins[0], rsurface.localvieworigin[0], surface->maxs[0]);
                        tempcenter[1] = bound(surface->mins[1], rsurface.localvieworigin[1], surface->maxs[1]);
                        tempcenter[2] = bound(surface->mins[2], rsurface.localvieworigin[2], surface->maxs[2]);
                    }
                    else
                    {
                        tempcenter[0] = (surface->mins[0] + surface->maxs[0]) * 0.5f;
                        tempcenter[1] = (surface->mins[1] + surface->maxs[1]) * 0.5f;
                        tempcenter[2] = (surface->mins[2] + surface->maxs[2]) * 0.5f;
                    }
                    Matrix4x4_Transform(&rsurface.matrix, tempcenter, center);
                    if (ent->transparent_offset) // transparent offset
                    {
                        center[0] += r_refdef.view.forward[0]*ent->transparent_offset;
                        center[1] += r_refdef.view.forward[1]*ent->transparent_offset;
                        center[2] += r_refdef.view.forward[2]*ent->transparent_offset;
                    }
                    R_MeshQueue_AddTransparent((rsurface.entity->flags & RENDER_WORLDOBJECT) ? TRANSPARENTSORT_SKY : ((rsurface.texture->currentmaterialflags & MATERIALFLAG_NODEPTHTEST) ? TRANSPARENTSORT_HUD : rsurface.texture->transparentsort), center, R_Q1BSP_DrawLight_TransparentCallback, ent, surface - rsurface.modelsurfaces, rsurface.rtlight);
                }
                continue;
            }
            if (r_shadow_usingdeferredprepass)
                continue;
            texturenumsurfaces = kend - k;
            texturesurfacelist = batchsurfacelist + k;
            R_Shadow_RenderLighting(texturenumsurfaces, texturesurfacelist);
        }
    }
    R_FrameData_ReturnToMark();
}
 
//Made by [515]
static void R_ReplaceWorldTexture_f(cmd_state_t *cmd)
{
    model_t     *m;
    texture_t   *t;
    int         i;
    const char  *r, *newt;
    skinframe_t *skinframe;
    if (!r_refdef.scene.worldmodel)
    {
        Con_Printf("There is no worldmodel\n");
        return;
    }
    m = r_refdef.scene.worldmodel;
 
    if(Cmd_Argc(cmd) < 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(cmd, 1);
    newt = Cmd_Argv(cmd, 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)*/ matchpattern( t->name, r, true ) )
        {
            if ((skinframe = R_SkinFrame_LoadExternal(newt, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PICMIP, true, false)))
            {
//              t->skinframes[0] = skinframe;
                t->currentskinframe = skinframe;
                Con_Printf("%s replaced with %s\n", r, newt);
            }
            else
            {
                Con_Printf("%s was not found\n", newt);
                return;
            }
        }
    }
}
 
//Made by [515]
static void R_ListWorldTextures_f(cmd_state_t *cmd)
{
    model_t     *m;
    texture_t   *t;
    int         i;
    if (!r_refdef.scene.worldmodel)
    {
        Con_Printf("There is no worldmodel\n");
        return;
    }
    m = r_refdef.scene.worldmodel;
 
    Con_Print("Worldmodel textures :\n");
    for(i=0,t=m->data_textures;i<m->num_textures;i++,t++)
        if (t->name[0] && strcasecmp(t->name, "NO TEXTURE FOUND"))
            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_usesurfaceculling);
    Cvar_RegisterVariable(&r_vis_trace);
    Cvar_RegisterVariable(&r_vis_trace_samples);
    Cvar_RegisterVariable(&r_vis_trace_delay);
    Cvar_RegisterVariable(&r_vis_trace_eyejitter);
    Cvar_RegisterVariable(&r_vis_trace_enlarge);
    Cvar_RegisterVariable(&r_vis_trace_expand);
    Cvar_RegisterVariable(&r_vis_trace_pad);
    Cvar_RegisterVariable(&r_vis_trace_surfaces);
    Cvar_RegisterVariable(&r_q3bsp_renderskydepth);
 
    Cmd_AddCommand(CF_CLIENT, "r_replacemaptexture", R_ReplaceWorldTexture_f, "override a map texture for testing purposes");
    Cmd_AddCommand(CF_CLIENT, "r_listmaptextures", R_ListWorldTextures_f, "list all textures used by the current map");
 
    //R_RegisterModule("GL_Surf", gl_surf_start, gl_surf_shutdown, gl_surf_newmap);
}