writebsp.cpp

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/*
Copyright (C) 1997-2001 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.

*/

#include "bsp.h"

static int c_nofaces;
static int c_facenodes;

/*
=========================================================
ONLY SAVE OUT PLANES THAT ARE ACTUALLY USED AS NODES
=========================================================
*/

void EmitPlanes (void)
{
    const plane_t* mp = mapplanes;

    for (int i = 0; i < nummapplanes; i++, mp++) {
        dBspPlane_t* dp = &curTile->planes[curTile->numplanes];
        VectorCopy(mp->normal, dp->normal);
        dp->dist = mp->dist;
        dp->type = mp->type;
        curTile->numplanes++;
    }
}

static void EmitLeaf (const node_t* node)
{
    dBspLeaf_t* leaf_p;
    int i;
    const bspbrush_t* b;

    /* emit a leaf */
    if (curTile->numleafs >= MAX_MAP_LEAFS)
        Sys_Error("MAX_MAP_LEAFS (%i)", curTile->numleafs);

    leaf_p = &curTile->leafs[curTile->numleafs];
    curTile->numleafs++;

    leaf_p->contentFlags = node->contentFlags;
    leaf_p->area = node->area;

    /* write bounding box info */
    VectorCopy(node->nBox.mins, leaf_p->mins);
    VectorCopy(node->nBox.maxs, leaf_p->maxs);

    /* write the leafbrushes */
    leaf_p->firstleafbrush = curTile->numleafbrushes;
    for (b = node->brushlist; b; b = b->next) {
        if (curTile->numleafbrushes >= MAX_MAP_LEAFBRUSHES)
            Sys_Error("MAX_MAP_LEAFBRUSHES (%i)", curTile->numleafbrushes);

        int brushnum = b->original - mapbrushes;
        for (i = leaf_p->firstleafbrush; i < curTile->numleafbrushes; i++)
            if (curTile->leafbrushes[i] == brushnum)
                break;
        if (i == curTile->numleafbrushes) {
            Verb_Printf(VERB_DUMP, "EmitLeaf: adding brush %i to leaf %i\n", brushnum, curTile->numleafs - 1);
            curTile->leafbrushes[curTile->numleafbrushes] = brushnum;
            curTile->numleafbrushes++;
        }
    }
    leaf_p->numleafbrushes = curTile->numleafbrushes - leaf_p->firstleafbrush;
}


static void EmitFace (const face_t* f)
{
    if (f->numpoints < 3) {
        return;     /* degenerated */
    }
    if (f->merged || f->split[0] || f->split[1]) {
        return;     /* not a final face */
    }

    if (curTile->numfaces >= MAX_MAP_FACES)
        Sys_Error("numfaces >= MAX_MAP_FACES (%i)", curTile->numfaces);
    dBspSurface_t* df = &curTile->faces[curTile->numfaces];
    curTile->numfaces++;

    df->planenum = f->planenum & (~1);
    df->side = f->planenum & 1;

    df->firstedge = curTile->numsurfedges;
    df->numedges = f->numpoints;
    df->texinfo = f->texinfo;
    int i;
    for (i = 0; i < f->numpoints; i++) {
        const int e = GetEdge(f->vertexnums[i], f->vertexnums[(i + 1) % f->numpoints], f);
        if (curTile->numsurfedges >= MAX_MAP_SURFEDGES)
            Sys_Error("numsurfedges >= MAX_MAP_SURFEDGES (%i)", curTile->numsurfedges);
        curTile->surfedges[curTile->numsurfedges] = e;
        curTile->numsurfedges++;
    }
    for (int i = 0; i < LIGHTMAP_MAX; i++)
        df->lightofs[i] = -1;
}

static int EmitDrawNode_r (node_t* node)
{
    const char* side[2] = {"front", "back"};

    if (node->planenum == PLANENUM_LEAF) {
        Verb_Printf(VERB_DUMP, "EmitDrawNode_r: creating singleton leaf.\n");
        EmitLeaf(node);
        return -curTile->numleafs;
    }

    /* emit a node   */
    if (curTile->numnodes >= MAX_MAP_NODES)
        Sys_Error("MAX_MAP_NODES (%i)", curTile->numnodes);
    dBspNode_t* n = &curTile->nodes[curTile->numnodes];
    Verb_Printf(VERB_DUMP, "EmitDrawNode_r: creating bsp node %i\n", curTile->numnodes);
    curTile->numnodes++;

    VectorCopy(node->nBox.mins, n->mins);
    VectorCopy(node->nBox.maxs, n->maxs);

    if (node->planenum & 1)
        Sys_Error("EmitDrawNode_r: odd planenum: %i", node->planenum);
    n->planenum = node->planenum;
    n->firstface = curTile->numfaces;

    if (!node->faces)
        c_nofaces++;
    else
        c_facenodes++;

    const face_t* f;
    for (f = node->faces; f; f = f->next)
        EmitFace(f);

    n->numfaces = curTile->numfaces - n->firstface;

    /* recursively output the other nodes */
    for (int i = 0; i < 2; i++) {
        if (node->children[i]->planenum == PLANENUM_LEAF) {
            Verb_Printf(VERB_DUMP, "EmitDrawNode_r: creating child leaf for %s of bsp node " UFO_SIZE_T ".\n", side[i], n - curTile->nodes);
            n->children[i] = -(curTile->numleafs + 1);
            EmitLeaf(node->children[i]);
        } else {
            Verb_Printf(VERB_DUMP, "EmitDrawNode_r: adding child node for bsp node " UFO_SIZE_T ".\n", n - curTile->nodes);
            n->children[i] = curTile->numnodes;
            EmitDrawNode_r(node->children[i]);
        }
    }

    return n - curTile->nodes;
}


int WriteBSP (node_t* headnode)
{
    int oldfaces, emittedHeadnode;

    c_nofaces = 0;
    c_facenodes = 0;

    Verb_Printf(VERB_EXTRA, "--- WriteBSP ---\n");

    oldfaces = curTile->numfaces;
    emittedHeadnode = EmitDrawNode_r(headnode);

    Verb_Printf(VERB_EXTRA, "%5i nodes with faces\n", c_facenodes);
    Verb_Printf(VERB_EXTRA, "%5i nodes without faces\n", c_nofaces);
    Verb_Printf(VERB_EXTRA, "%5i faces\n", curTile->numfaces - oldfaces);

    return emittedHeadnode;
}

void SetModelNumbers (void)
{
    int i;
    char value[10];

    /* 0 is the world - start at 1 */
    int models = 1;
    for (i = 1; i < num_entities; i++) {
        if (entities[i].numbrushes) {
            Com_sprintf(value, sizeof(value), "*%i", models);
            models++;
            SetKeyValue(&entities[i], "model", value);
        }
    }
}

void EmitBrushes (void)
{
    curTile->numbrushsides = 0;
    curTile->numbrushes = nummapbrushes;
    /* Clear out curTile->brushes */
    OBJZERO(curTile->brushes);

    for (int bnum = 0; bnum < nummapbrushes; bnum++) {
        const mapbrush_t* b = &mapbrushes[bnum];
        dBspBrush_t* db = &curTile->dbrushes[bnum];
        cBspBrush_t* cb = &curTile->brushes[bnum];

        db->brushContentFlags = b->contentFlags;
        db->firstbrushside = curTile->numbrushsides;
        db->numsides = b->numsides;
        cb->brushContentFlags = b->contentFlags;
        cb->firstbrushside = curTile->numbrushsides;
        cb->numsides = b->numsides;
        cb->checkcount = 0;
        for (int j = 0; j < b->numsides; j++) {
            if (curTile->numbrushsides == MAX_MAP_BRUSHSIDES) {
                Sys_Error("MAX_MAP_BRUSHSIDES (%i)", curTile->numbrushsides);
            } else {
                dBspBrushSide_t* cp = &curTile->brushsides[curTile->numbrushsides];
                curTile->numbrushsides++;
                cp->planenum = b->original_sides[j].planenum;
                cp->texinfo = b->original_sides[j].texinfo;
            }
        }

        /* add any axis planes not contained in the brush to bevel off corners */
        for (int x = 0; x < 3; x++)
            for (int s = -1; s <= 1; s += 2) {
                /* add the plane */
                vec3_t normal;
                VectorCopy(vec3_origin, normal);
                normal[x] = (float)s;

                vec_t dist;
                if (s == -1)
                    dist = -b->mbBox.mins[x];
                else
                    dist = b->mbBox.maxs[x];
                int planenum = FindOrCreateFloatPlane(normal, dist);

                int i;
                for (i = 0; i < b->numsides; i++)
                    if (b->original_sides[i].planenum == planenum)
                        break;
                if (i == b->numsides) {
                    if (curTile->numbrushsides >= MAX_MAP_BRUSHSIDES)
                        Sys_Error("MAX_MAP_BRUSHSIDES (%i)", curTile->numbrushsides);

                    curTile->brushsides[curTile->numbrushsides].planenum = planenum;
                    curTile->brushsides[curTile->numbrushsides].texinfo = curTile->brushsides[curTile->numbrushsides - 1].texinfo;
                    curTile->numbrushsides++;
                    db->numsides++;
                    cb->numsides++;
                }
            }
    }
}

void BeginBSPFile (void)
{
    /* Create this shortcut to mapTiles[0] */
    curTile = &mapTiles.mapTiles[0];
    /* Set the number of tiles to 1. */
    mapTiles.numTiles = 1;

    /* these values may actually be initialized
     * if the file existed when loaded, so clear them explicitly */
    curTile->nummodels = 0;
    curTile->numfaces = 0;
    curTile->numbrushsides = 0;
    curTile->numleafbrushes = 0;
    curTile->numsurfedges = 0;
    curTile->numnodes = 0;

    /* edge 0 is not used, because 0 can't be negated */
    curTile->numedges = 1;

    /* leave vertex 0 as an error */
    curTile->numvertexes = 1;
    curTile->numnormals = 1;

    /* leave leaf 0 as an error */
    curTile->numleafs = 1;
    curTile->leafs[0].contentFlags = CONTENTS_SOLID;
}


void EndBSPFile (const char* filename)
{
    EmitBrushes();
    EmitPlanes();
    UnparseEntities();

    /* write the map */
    Verb_Printf(VERB_LESS, "Writing %s\n", filename);
    WriteBSPFile(filename);
}

extern int firstmodeledge;

void BeginModel (int entityNum)
{
    if (curTile->nummodels == MAX_MAP_MODELS)
        Sys_Error("MAX_MAP_MODELS (%i)", curTile->nummodels);

    dBspModel_t* mod = &curTile->models[curTile->nummodels];
    mod->firstface = curTile->numfaces;

    firstmodeledge = curTile->numedges;

    /* bound the brushes */
    const entity_t* e = &entities[entityNum];

    int start = e->firstbrush;
    int end = start + e->numbrushes;
    AABB modBox;
    modBox.setNegativeVolume();

    for (int j = start; j < end; j++) {
        const mapbrush_t* b = &mapbrushes[j];
        /* not a real brush (origin brush) - e.g. func_door */
        if (!b->numsides)
            continue;
        modBox.add(b->mbBox);
    }

    mod->dbmBox.set(modBox);
}


void EndModel (void)
{
    dBspModel_t* mod;

    /* set surfaces and brushes */
    mod = &curTile->models[curTile->nummodels];
    mod->numfaces = curTile->numfaces - mod->firstface;

    /* increment model count */
    curTile->nummodels++;
}