/*******************************************************************************
 * Copyright (c) 2005, 2009 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.opengl;

/**
 * The GLData class is a device-independent description
 * of the pixel format attributes of a GL drawable.
 *
 * @see GLCanvas
 * @see <a href="http://www.eclipse.org/swt/snippets/#opengl">OpenGL snippets</a>
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 * 
 * @since 3.2
 */

public class GLData {
	/**
	 * Specifies a double-buffered surface.  During context
	 * creation, only double-buffered formats are considered
	 * when set to true. 
	 */
	public boolean doubleBuffer;

	/**
	 * Specifies a stereo surface.  During context creation,
	 * only stereo formats are considered when set to true. 
	 */
	public boolean stereo;

	/**
	 * The size in bits of the color buffer's red channel.
	 * During context creation, this specifies the minimum
	 * required red bits.
	 */
	public int redSize;

	/**
	 * The size in bits of the color buffer's green channel.
	 * During context creation, this specifies the minimum
	 * required green bits.
	 */
	public int greenSize;

	/**
	 * The size in bits of the color buffer's blue channel.
	 * During context creation, this specifies the minimum
	 * required blue bits.
	 */
	public int blueSize;

	/**
	 * The size in bits of the color buffer's alpha channel.
	 * During context creation, this specifies the minimum
	 * required alpha bits.
	 */
	public int alphaSize;

	/**
	 * The size in bits of the depth buffer.  During context
	 * creation, the smallest depth buffer of at least the
	 * specified value is preferred, or zero for no depth
	 * buffer.
	 */
	public int depthSize;

	/**
	 * The desired number of stencil bitplanes.  During
	 * context creation, the smallest stencil buffer of at
	 * least the specified value is preferred, or zero for
	 * no stencil buffer.
	 */
	public int stencilSize;

	/**
	 * The size in bits of the accumulation buffer's red
	 * channel. During context creation, this specifies the
	 * minimum required red bits.
	 */
	public int accumRedSize;

	/**
	 * The size in bits of the accumulation buffer's green
	 * channel. During context creation, this specifies the
	 * minimum required green bits.
	 */
	public int accumGreenSize;

	/**
	 * The size in bits of the accumulation buffer's blue
	 * channel. During context creation, this specifies the
	 * minimum required blue bits.
	 */
	public int accumBlueSize;

	/**
	 * The size in bits of the accumulation buffer's alpha
	 * channel. During context creation, this specifies the
	 * minimum required alpha bits.
	 */
	public int accumAlphaSize;

	/**
	 * The number of multisample buffers used by this context.
	 * During context creation, this specifies the minimum
	 * number of multisample buffers requested.
	 */
	public int sampleBuffers;

	/**
	 * The number of samples accepted in the multisample buffer.
	 * During creation, pixel formats with the smallest number of
	 * samples that meets or exceeds the specified minimum number
	 * are preferred.
	 */
	public int samples;
	
	/**
	 * Another GLCanvas whose texture namespace and display lists
	 * should be shared.
	 * 
	 * @since 3.5
	 */
	public GLCanvas shareContext;
	
/**
 * Returns a string containing a concise, human-readable
 * description of the receiver.
 *
 * @return a string representation of the data
 */
public String toString() {
	return (doubleBuffer ? "doubleBuffer," : "") +
		(stereo ? "stereo," : "") +
		"r:" + redSize + " g:" + greenSize + " b:" + blueSize + " a:" + alphaSize + "," +
		"depth:" + depthSize + ",stencil:" + stencilSize +
		",accum r:" + accumRedSize + "g:" + accumGreenSize + "b:" + accumBlueSize + "a:" + accumAlphaSize +
		",sampleBuffers:" + sampleBuffers + ",samples:" + samples;
}
}