/*******************************************************************************
 * Breakout Cave Survey Visualizer
 *
 * Copyright (C) 2014 James Edwards
 *
 * jedwards8 at fastmail dot fm
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *******************************************************************************/
package org.andork.jogl.old;

import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2ES2;

public class JOGLBlendModifier implements JOGLModifier {
	private boolean prevEnabled;

	private int sfactor = GL2ES2.GL_SRC_ALPHA;
	private int dfactor = GL2ES2.GL_ONE_MINUS_SRC_ALPHA;

	@Override
	public void afterDraw(GL2ES2 gl, JOGLObject object) {
		if (!prevEnabled) {
			gl.glDisable(GL.GL_BLEND);
		}
	}

	@Override
	public void beforeDraw(GL2ES2 gl, JOGLObject object) {
		prevEnabled = gl.glIsEnabled(GL.GL_BLEND);

		gl.glEnable(GL.GL_BLEND);
		gl.glBlendFunc(sfactor, dfactor);
	}

	public JOGLBlendModifier dfactor(int dfactor) {
		this.dfactor = dfactor;
		return this;
	}

	public JOGLBlendModifier sfactor(int sfactor) {
		this.sfactor = sfactor;
		return this;
	}

}