glfile.c

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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code 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.

Quake III Arena source code 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 Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

#include "qbsp.h"

int     c_glfaces;

int PortalVisibleSides (portal_t *p)
{
    int     fcon, bcon;

    if (!p->onnode)
        return 0;       // outside

    fcon = p->nodes[0]->contents;
    bcon = p->nodes[1]->contents;

    // same contents never create a face
    if (fcon == bcon)
        return 0;

    // FIXME: is this correct now?
    if (!fcon)
        return 1;
    if (!bcon)
        return 2;
    return 0;
}

void OutputWinding (winding_t *w, FILE *glview)
{
    static  int level = 128;
    vec_t       light;
    int         i;

    fprintf (glview, "%i\n", w->numpoints);
    level+=28;
    light = (level&255)/255.0;
    for (i=0 ; i<w->numpoints ; i++)
    {
        fprintf (glview, "%6.3f %6.3f %6.3f %6.3f %6.3f %6.3f\n",
            w->p[i][0],
            w->p[i][1],
            w->p[i][2],
            light,
            light,
            light);
    }
    fprintf (glview, "\n");
}

/*
=============
OutputPortal
=============
*/
void OutputPortal (portal_t *p, FILE *glview)
{
    winding_t   *w;
    int     sides;

    sides = PortalVisibleSides (p);
    if (!sides)
        return;

    c_glfaces++;

    w = p->winding;

    if (sides == 2)     // back side
        w = ReverseWinding (w);

    OutputWinding (w, glview);

    if (sides == 2)
        FreeWinding(w);
}

/*
=============
WriteGLView_r
=============
*/
void WriteGLView_r (node_t *node, FILE *glview)
{
    portal_t    *p, *nextp;

    if (node->planenum != PLANENUM_LEAF)
    {
        WriteGLView_r (node->children[0], glview);
        WriteGLView_r (node->children[1], glview);
        return;
    }

    // write all the portals
    for (p=node->portals ; p ; p=nextp)
    {
        if (p->nodes[0] == node)
        {
            OutputPortal (p, glview);
            nextp = p->next[0];
        }
        else
            nextp = p->next[1];
    }
}

/*
=============
WriteGLView
=============
*/
void WriteGLView (tree_t *tree, char *source)
{
    char    name[1024];
    FILE    *glview;

    c_glfaces = 0;
    sprintf (name, "%s%s.gl",outbase, source);
    printf ("Writing %s\n", name);

    glview = fopen (name, "w");
    if (!glview)
        Error ("Couldn't open %s", name);
    WriteGLView_r (tree->headnode, glview);
    fclose (glview);

    printf ("%5i c_glfaces\n", c_glfaces);
}

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