Function render_square

source/src/rendercubes.cpp:340–410

}

void render_square(int wtex, float floor1, float floor2, float ceil1, float ceil2, int x1, int y1, int x2, int y2, int size, sqr *l1, sqr *l2, bool flip, int dir)   // wall quads
{
    if(showmipstats) { l1 = &sbright; l2 = &sdark; }

    Texture *t = lookupworldtexture(wtex);
    float xf = TEXTURESCALE/t->xs;
    float yf = -TEXTURESCALE/t->ys;
    float xs = size*xf;
    float xo = xf*(x1==x2 ? min(y1,y2) : min(x1,x2));

    bool first = striptype!=STRIP_WALL || striptex!=wtex || ox!=x1 || oy!=y1 || ofloor!=floor1 || oceil!=ceil1 || odir!=dir,
         hf = floor1!=floor2 || ceil1!=ceil2;

    if(first)
    {
        stripend(verts);
        firstindex = verts.length();
        striptex = wtex;
        striptype = STRIP_WALL;

        if(!flip)
        {
            vert(x1, y1, ceil1,  l1, xo, yf*ceil1);
            vert(x1, y1, floor1, l1, xo, yf*floor1);
        }
        else
        {
            vert(x1, y1, floor1, l1, xo, yf*floor1);
            vert(x1, y1, ceil1,  l1, xo, yf*ceil1);
        }
        ol1r = l1->r;
        ol1g = l1->g;
        ol1b = l1->b;
    }
    else        // continue strip
    {
        int lighterr = lighterror*2;
        if((!hf && !ohf)
        && ((iabs(ol1r-l2->r)<lighterr && iabs(ol1g-l2->g)<lighterr && iabs(ol1b-l2->b)<lighterr) || !wtex))       // skip vertices if light values are close enough
        {
            verts.setsize(verts.length()-2);
            nquads--;
        }
        else
        {
            uchar *p1 = (uchar *)(&verts[verts.length()-1].r);
            ol1r = p1[0];
            ol1g = p1[1];
            ol1b = p1[2];
        }
    }

    if(!flip)
    {
        vert(x2, y2, ceil2,  l2, xo+xs, yf*ceil2);
        vert(x2, y2, floor2, l2, xo+xs, yf*floor2);
    }
    else