public void unapply(GOut g) {
BGL gl = g.gl;
gl.glSampleCoverage(1.0f, false);
gl.glDisable(GL.GL_SAMPLE_COVERAGE);
}
public void apply(GOut g) {
BGL gl = g.gl;
gl.glEnable(GL.GL_SAMPLE_COVERAGE);
gl.glSampleCoverage(cov, inv);
}