/*
 * Copyright (c) 2003-2005 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
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 * Sun gratefully acknowledges that this software was originally authored
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 */

package demos.util;

import com.sun.opengl.util.FileUtil;
import com.sun.opengl.util.texture.Texture;
import com.sun.opengl.util.texture.TextureData;
import com.sun.opengl.util.texture.TextureIO;
import java.io.IOException;
import javax.media.opengl.GL;
import javax.media.opengl.GLException;



/** Helper class for loading cubemaps from a set of textures. */

public class Cubemap {
    
  private static final String[] suffixes = { "posx", "negx", "posy", "negy", "posz", "negz" };
  private static final int[] targets = { GL.GL_TEXTURE_CUBE_MAP_POSITIVE_X,
                                         GL.GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
                                         GL.GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
                                         GL.GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
                                         GL.GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
                                         GL.GL_TEXTURE_CUBE_MAP_NEGATIVE_Z };

  public static Texture loadFromStreams(ClassLoader scope,
                                        String basename,
                                        String suffix,
                                        boolean mipmapped) throws IOException, GLException {
    Texture cubemap = TextureIO.newTexture(GL.GL_TEXTURE_CUBE_MAP);

    for (int i = 0; i < suffixes.length; i++) {
      String resourceName = basename + suffixes[i] + "." + suffix;
      TextureData data = TextureIO.newTextureData(scope.getResourceAsStream(resourceName),
                                                  mipmapped,
                                                  FileUtil.getFileSuffix(resourceName));
      if (data == null) {
        throw new IOException("Unable to load texture " + resourceName);
      }
      cubemap.updateImage(data, targets[i]);
    }

    return cubemap;
  }
}