/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistribution of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution 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 Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
 * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
 * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
 * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed or intended for use
 * in the design, construction, operation or maintenance of any nuclear
 * facility.
 *
 * Sun gratefully acknowledges that this software was originally authored
 * and developed by Kenneth Bradley Russell and Christopher John Kline.
 */

package org.j3d.opengl.swt.internal.ri.x11;

// External imports
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLCapabilitiesChooser;
import javax.media.opengl.GLContext;
import javax.media.opengl.GLException;

import com.sun.opengl.impl.x11.GLX;
import com.sun.opengl.impl.x11.XVisualInfo;

// Local Imports
// None

public class X11OffscreenGLDrawable extends X11GLDrawable {
    private long pixmap;
    // Width and height of the underlying bitmap
    private int width;
    private int height;

    public X11OffscreenGLDrawable(GLCapabilities capabilities,
                                  GLCapabilitiesChooser chooser)
    {
        super(capabilities, chooser);
    }

    public GLContext createContext(GLContext shareWith)
    {
        return new X11OffscreenGLContext(this, shareWith);
    }

    public void setSize(int newWidth, int newHeight)
    {
        width = newWidth;
        height = newHeight;
        if(pixmap != 0)
            destroy();

        create();
    }

    public int getWidth()
    {
        return width;
    }

    public int getHeight()
    {
        return height;
    }

    private void create()
    {
        display = X11GLXUtils.getDisplayConnection();
        XVisualInfo vis = chooseVisual(false);
        int bitsPerPixel = vis.depth();

        int screen = GLX.DefaultScreen(display);
        pixmap = GLX.XCreatePixmap(display, (int) GLX.RootWindow(display, screen), width, height, bitsPerPixel);
        if(pixmap == 0)
            throw new GLException("XCreatePixmap failed");

        drawable = GLX.glXCreateGLXPixmap(display, vis, pixmap);
        if(drawable == 0)
        {
            GLX.XFreePixmap(display, pixmap);
            pixmap = 0;
            throw new GLException("glXCreateGLXPixmap failed");
        }
        isDoubleBuffered = (X11GLXUtils.glXGetConfig(display, vis, GLX.GLX_DOUBLEBUFFER) != 0);
    }

    public void destroy()
    {
        if(pixmap != 0)
        {
            // Must destroy pixmap and GLXPixmap

            // FIXME: workaround for crashes on NVidia hardware when
            // destroying pixmap (no context is current at the point of the
            // crash, at least from the point of view of
            // glXGetCurrentContext)
            GLX.glXMakeCurrent(display, 0, 0);

            GLX.glXDestroyGLXPixmap(display, drawable);
            GLX.XFreePixmap(display, pixmap);
            drawable = 0;
            pixmap = 0;
            display = 0;
        }
    }
}