source engine render bsp wireframe

void CBSPFile::RenderWireFrame() {
    for (int i = 0; i < m_edgeLumpSize; i++) {
        dedge_t* edge = &m_edgeLump[i];

        if (edge) {
            dvertex_t* v0 = &m_vertexLump[edge->v[0]];
            dvertex_t* v1 = &m_vertexLump[edge->v[1]];

            if (v0 && v1) {
                Vector3 s0, s1;

                if (WorldToScreen(v0->position, s0) && WorldToScreen(v1->position, s1)) {
                    g_pRenderer->DrawLine(s0, s1, Color::Black());
                }
            }
        }
    }
}