Function box

source/src/rendergl.cpp:227–236

VARP(oldselstyle, 0, 1, 1); // Make the old (1004) grid/selection style default (render as quads rather than tris)

void box(block &b, float z1, float z2, float z3, float z4)
{
    glBegin((oldselstyle ? GL_QUADS : GL_TRIANGLE_STRIP));
    glVertex3f((float)b.x,      (float)b.y,      z1);
    glVertex3f((float)b.x+b.xs, (float)b.y,      z2);
    glVertex3f((float)(oldselstyle ? b.x+b.xs : b.x), (float)b.y+b.ys, (oldselstyle ? z3 : z4));
    glVertex3f((float)(oldselstyle ? b.x : b.x+b.xs), (float)b.y+b.ys, (oldselstyle ? z4 : z3));
    glEnd();
    xtraverts += 4;
}

void box2d(int x1, int y1, int x2, int y2, int gray)
{