textures.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"
#include "textures.h"

static int nummiptex = 0;
textureref_t textureref[MAX_MAP_TEXTURES];

int FindMiptex (const char* name)
{
    int i;

    /* search through textures that have already been loaded. */
    for (i = 0; i < nummiptex; i++)
        if (Q_streq(name, textureref[i].name)) {
            return i;
        }
    if (nummiptex == MAX_MAP_TEXTURES)
        Sys_Error("MAX_MAP_TEXTURES");
    Q_strncpyz(textureref[i].name, name, sizeof(textureref[i].name));

    return i;
}


static const vec3_t baseaxis[18] =
{
{0,0,1}, {1,0,0}, {0,-1,0},         /* floor */
{0,0,-1}, {1,0,0}, {0,-1,0},        /* ceiling */
{1,0,0}, {0,1,0}, {0,0,-1},         /* west wall */
{-1,0,0}, {0,1,0}, {0,0,-1},        /* east wall */
{0,1,0}, {1,0,0}, {0,0,-1},         /* south wall */
{0,-1,0}, {1,0,0}, {0,0,-1}         /* north wall */
};

static void TextureAxisFromPlane (plane_t* pln, vec3_t xv, vec3_t yv, bool isTerrain)
{
    /* Knightmare- terrain support, use floor/ceiling axis only */
    int numaxis = (isTerrain) ? 2 : 6;

    vec_t best = 0;
    int bestaxis = 0;

    for (int i = 0; i < numaxis; i++) {
        const vec_t dot = DotProduct(pln->normal, baseaxis[i * 3]);
        if (dot > best) {
            best = dot;
            bestaxis = i;
        }
    }

    VectorCopy(baseaxis[bestaxis * 3 + 1], xv);
    VectorCopy(baseaxis[bestaxis * 3 + 2], yv);
}


int TexinfoForBrushTexture (plane_t* plane, brush_texture_t* bt, const vec3_t origin, bool isTerrain)
{
    vec3_t vecs[2];
    int sv, tv;
    vec_t ang, sinv, cosv;
    dBspTexinfo_t tx, *tc;
    int i, j;
    float shift[2];
    vec3_t scaledOrigin;

    if (!bt->name[0])
        return 0;

    OBJZERO(tx);
    Q_strncpyz(tx.texture, bt->name, sizeof(tx.texture));

    TextureAxisFromPlane(plane, vecs[0], vecs[1], isTerrain);

    /* dot product of a vertex location with the [4] part will produce a
     * texcoord (s or t depending on the first index) */
    VectorScale(origin, 1.0 / bt->scale[0], scaledOrigin);
    shift[0] = DotProduct(scaledOrigin, vecs[0]);
    VectorScale(origin, 1.0 / bt->scale[1], scaledOrigin);
    shift[1] = DotProduct(scaledOrigin, vecs[1]);

    if (!bt->scale[0])
        bt->scale[0] = 1;
    if (!bt->scale[1])
        bt->scale[1] = 1;

    /* rotate axis */
    if (bt->rotate == 0) {
        sinv = 0;
        cosv = 1;
    } else if (bt->rotate == 90) {
        sinv = 1;
        cosv = 0;
    } else if (bt->rotate == 180) {
        sinv = 0;
        cosv = -1;
    } else if (bt->rotate == 270) {
        sinv = -1;
        cosv = 0;
    } else {
        ang = bt->rotate * torad;
        sinv = sin(ang);
        cosv = cos(ang);
    }

    shift[0] = cosv * shift[0] - sinv * shift[1];
    shift[1] = sinv * shift[0] + cosv * shift[1];

    if (vecs[0][0])
        sv = 0;
    else if (vecs[0][1])
        sv = 1;
    else
        sv = 2;

    if (vecs[1][0])
        tv = 0;
    else if (vecs[1][1])
        tv = 1;
    else
        tv = 2;

    for (i = 0; i < 2; i++) {
        const vec_t ns = cosv * vecs[i][sv] - sinv * vecs[i][tv];
        const vec_t nt = sinv * vecs[i][sv] + cosv * vecs[i][tv];
        vecs[i][sv] = ns;
        vecs[i][tv] = nt;
    }

    for (i = 0; i < 2; i++)
        for (j = 0; j < 3; j++)
            tx.vecs[i][j] = vecs[i][j] / bt->scale[i];

    /* texture offsets */
    tx.vecs[0][3] = bt->shift[0] + shift[0];
    tx.vecs[1][3] = bt->shift[1] + shift[1];

    tx.surfaceFlags = bt->surfaceFlags;
    tx.value = bt->value;

    /* find the texinfo */
    tc = curTile->texinfo;
    for (i = 0; i < curTile->numtexinfo; i++, tc++) {
        if (tc->surfaceFlags != tx.surfaceFlags)
            continue;
        if (tc->value != tx.value)
            continue;
        if (!Q_streq(tc->texture, tx.texture))
            continue;
        for (j = 0; j < 2; j++) {
            for (int k = 0; k < 4; k++) {
                if (tc->vecs[j][k] != tx.vecs[j][k])
                    goto skip;
            }
        }
        return i;
skip:;
    }
    if (curTile->numtexinfo >= MAX_MAP_TEXINFO)
        Sys_Error("MAX_MAP_TEXINFO overflow");
    *tc = tx;
    curTile->numtexinfo++;

    return i;
}