lwjgl2-arm64/src/java/org/lwjgl/opengl/Util.java

/*
 * 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.IntBuffer;

import org.lwjgl.BufferUtils;

/**
 * Simple utility class.
 *
 * @author cix_foo <cix_foo@users.sourceforge.net>
 * @version $Revision$
 */

public final class Util {

	private static final IntBuffer int_buffer = BufferUtils.createIntBuffer(16);

	/** No c'tor */
	private Util() {
	}

	public static void checkGLError() {
		int err = GL11.glGetError();
		if ( err != GL11.GL_NO_ERROR ) {
			throw new OpenGLException(err);
		}
	}

	/**
	 * Obtain a GL integer value from the driver
	 *
	 * @param gl_enum The GL value you want
	 *
	 * @return the integer value
	 */
	public static int glGetInteger(int gl_enum) {
		GL11.glGetInteger(gl_enum, int_buffer);
		return int_buffer.get(0);
	}

	/** Handy mutable integer value class */
	static final class IntValue {

		int value;

		IntValue(int value) {
			this.value = value;
		}

		public boolean equals(Object obj) {
			return ((IntValue)obj).value == value;
		}

		public int hashCode() {
			return value;
		}
	}


}