@Override
    public void glAlphaFunc(final int func, final float ref) {
        GL11.glAlphaFunc(func, ref);
    }
The LWJGL implementation of interfaces {@link GL}, {@link GL2}, {@link GL3}, {@link GL4}.
jme3-lwjgl3/src/main/java/com/jme3/renderer/lwjgl/LwjglGL.java