/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is Mozilla Android code.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2009-2010
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *   James Willcox <jwillcox@mozilla.com>
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
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package org.mozilla.gecko.gfx;

import android.opengl.GLES10;
import java.util.Stack;

public class TextureGenerator {
    private static final int MIN_TEXTURES = 5;

    private static TextureGenerator sSharedInstance;
    private Stack<Integer> mTextureIds;

    private TextureGenerator() { mTextureIds = new Stack<Integer>(); }

    public static TextureGenerator get() {
        if (sSharedInstance == null)
            sSharedInstance = new TextureGenerator();
        return sSharedInstance;
    }

    public synchronized int take() {
        if (mTextureIds.empty())
            return 0;

        return (int)mTextureIds.pop();
    }

    public synchronized void fill() {
        int[] textures = new int[1];
        while (mTextureIds.size() < MIN_TEXTURES) {
            GLES10.glGenTextures(1, textures, 0);
            mTextureIds.push(textures[0]);
        }
    }
}


