static u8
mesh_to_vmem(struct mesh *m, real32 *v, real32 *n, real32 *t, umax *v_idx, umax *n_idx, umax *t_idx, umax i, umax idx) {
    glGenVertexArrays(1, &m->vao);
    glBindVertexArray(m->vao);
    if (v) {
        glGenBuffers(1, &m->vertices);
        glBindBuffer(GL_ARRAY_BUFFER, m->vertices);
        glBufferData(GL_ARRAY_BUFFER, i * 4, v, GL_STATIC_DRAW);
    }
    if (n) {
        glGenBuffers(1, &m->normals);
        glBindBuffer(GL_ARRAY_BUFFER, m->normals);
        glBufferData(GL_ARRAY_BUFFER, i * 3, v, GL_STATIC_DRAW);
    }
    if (t) {
        glGenBuffers(1, &m->tex_coords);
        glBindBuffer(GL_ARRAY_BUFFER, m->tex_coords);
        glBufferData(GL_ARRAY_BUFFER, i * 3, v, GL_STATIC_DRAW);
    }
    if (v_idx) {
        glGenBuffers(1, &m->v_idx);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m->v_idx);
        glBufferData(GL_ELEMENT_ARRAY_BUFFER, idx, v_idx, GL_STATIC_DRAW);
    }
    if (n_idx) {
        glGenBuffers(1, &m->n_idx);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m->n_idx);
        glBufferData(GL_ELEMENT_ARRAY_BUFFER, idx, n_idx, GL_STATIC_DRAW);
    }
    if (t_idx) {
        glGenBuffers(1, &m->t_idx);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m->t_idx);
        glBufferData(GL_ELEMENT_ARRAY_BUFFER, idx, t_idx, GL_STATIC_DRAW);
    }

    return 0;
}