/*
 * Copyright (c) 2002-2004 LWJGL Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'LWJGL' nor the names of
 *   its contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.lwjgl.opengl;

import java.nio.ByteBuffer;

import org.lwjgl.LWJGLException;
import org.lwjgl.BufferUtils;

import java.awt.GraphicsDevice;
import java.awt.GraphicsConfiguration;

/*
 * Import the needed SUN specific classes. They
 * are needed since there is no official way to access
 * the screen and visual from GraphicsDevice and
 * GraphicsConfiguration respectively.
 */
import sun.awt.X11GraphicsDevice;
import sun.awt.X11GraphicsConfig;

/**
 * $Id$
 *
 * @author elias_naur <elias_naur@users.sourceforge.net>
 * @version $Revision$
 */
final class LinuxCanvasImplementation implements AWTCanvasImplementation {
	static int getScreenFromDevice(GraphicsDevice device) {
		X11GraphicsDevice x11_device = (X11GraphicsDevice)device;
		return x11_device.getScreen();
	}

	private static int getVisualIDFromConfiguration(GraphicsConfiguration configuration) {
		X11GraphicsConfig x11_config = (X11GraphicsConfig)configuration;
		return x11_config.getVisual();
	}

	public PeerInfo createPeerInfo(AWTGLCanvas canvas) throws LWJGLException {
		return new LinuxAWTGLCanvasPeerInfo(canvas);
	}

	/**
	 * Find a proper GraphicsConfiguration from the given GraphicsDevice and PixelFormat.
	 *
	 * @return The GraphicsConfiguration corresponding to a visual that matches the pixel format.
	 */
	public GraphicsConfiguration findConfiguration(GraphicsDevice device, PixelFormat pixel_format) throws LWJGLException {
		X11GraphicsDevice x11_device = (X11GraphicsDevice)device;
		int screen = getScreenFromDevice(device);
		int visual_id_matching_format = findVisualIDFromFormat(screen, pixel_format);
		GraphicsConfiguration[] configurations = device.getConfigurations();
		for (int i = 0; i < configurations.length; i++) {
			int visual_id = getVisualIDFromConfiguration(configurations[i]);
			if (visual_id == visual_id_matching_format)
				return configurations[i];
		}
		throw new LWJGLException("Could not find the matching GraphicsConfiguration to visual id");
	}

	private static int findVisualIDFromFormat(int screen, PixelFormat pixel_format) throws LWJGLException {
		try {
			LinuxDisplay.lockAWT();
			try {
				GLContext.loadOpenGLLibrary();
				try {
					LinuxDisplay.incDisplay();
					return nFindVisualIDFromFormat(screen, pixel_format);
				} finally {
					LinuxDisplay.decDisplay();
				}
			} finally {
				GLContext.unloadOpenGLLibrary();
			}
		} finally {
			LinuxDisplay.unlockAWT();
		}
	}
	private static native int nFindVisualIDFromFormat(int screen, PixelFormat pixel_format) throws LWJGLException;
}