/*
 * 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 net.java.games.jogl.impl.x11;

import net.java.games.jogl.*;
import net.java.games.jogl.impl.*;

public class X11PbufferGLContext extends X11GLContext {
  private X11PbufferGLDrawable drawable;

  public X11PbufferGLContext(X11PbufferGLDrawable drawable,
                             GLContext shareWith) {
    super(drawable, shareWith);
    this.drawable = drawable;
  }

  public boolean canCreatePbufferContext() {
    return false;
  }

  public GLDrawableImpl createPbufferDrawable(GLCapabilities capabilities,
                                              int initialWidth,
                                              int initialHeight) {
    throw new GLException("Not supported");
  }

  public void bindPbufferToTexture() {
    // FIXME: figure out how to implement this
    throw new GLException("Not yet implemented");
  }

  public void releasePbufferFromTexture() {
    // FIXME: figure out how to implement this
    throw new GLException("Not yet implemented");
  }

  protected int makeCurrentImpl() throws GLException {
    if (drawable.getDrawable() == 0) {
      // pbuffer not instantiated (yet?)
      if (DEBUG) {
        System.err.println("pbuffer not instantiated");
      }
      return CONTEXT_NOT_CURRENT;
    }

    // Note that we have to completely override makeCurrentImpl
    // because the underlying makeCurrent call differs for pbuffers
    lockAWT();
    try {
      boolean created = false;
      if (context == 0) {
        create();
        if (DEBUG) {
          System.err.println(getThreadName() + ": !!! Created GL context for " + getClass().getName());
        }
        created = true;
      }

      if (!GLX.glXMakeContextCurrent(drawable.getDisplay(),
                                     drawable.getDrawable(),
                                     drawable.getDrawable(),
                                     context)) {
        throw new GLException("Error making context current");
      } else {
        mostRecentDisplay = drawable.getDisplay();
        if (DEBUG && VERBOSE) {
          System.err.println(getThreadName() + ": glXMakeCurrent(display " + toHexString(drawable.getDisplay()) +
                             ", drawable " + toHexString(drawable.getDrawable()) +
                             ", context " + toHexString(context) + ") succeeded");
        }
      }

      if (created) {
        resetGLFunctionAvailability();
        return CONTEXT_CURRENT_NEW;
      }
      return CONTEXT_CURRENT;
    } finally {
      unlockAWT();
    }
  }

  protected void releaseImpl() throws GLException {
    lockAWT();
    try {
      if (!GLX.glXMakeContextCurrent(drawable.getDisplay(), 0, 0, 0)) {
        throw new GLException("Error freeing OpenGL context");
      }
    } finally {
      unlockAWT();
    }
  }

  public int getOffscreenContextReadBuffer() {
    throw new GLException("Should not call this");
  }

  public boolean offscreenImageNeedsVerticalFlip() {
    throw new GLException("Should not call this");
  }

  public int getFloatingPointMode() {
    return drawable.getFloatingPointMode();
  }

  protected void create() {
    if (DEBUG) {
      System.err.println("Creating context for pbuffer " + drawable.getWidth() +
                         " x " + drawable.getHeight());
    }

    // Create a gl context for the p-buffer.
    X11GLContext other = (X11GLContext) GLContextShareSet.getShareContext(this);
    long share = 0;
    if (other != null) {
      share = other.getContext();
      if (share == 0) {
        throw new GLException("GLContextShareSet returned an invalid OpenGL context");
      }
    }
    context = GLX.glXCreateNewContext(drawable.getDisplay(), drawable.getFBConfig(), GL.GLX_RGBA_TYPE, share, true);
    if (context == 0) {
      throw new GLException("pbuffer creation error: glXCreateNewContext() failed");
    }
    GLContextShareSet.contextCreated(this);

    if (DEBUG) {
      System.err.println("Created context for pbuffer " + drawable.getWidth() +
                         " x " + drawable.getHeight());
    }
  }
}