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/*
* Copyright (c) 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
* 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 com.sun.opengl.util;
import javax.media.opengl.*;
import com.sun.opengl.impl.*;
/** Provides control over the primary display's gamma, brightness and
contrast controls via the hardware gamma ramp tables. Not
supported on all platforms or graphics hardware. <P>
Thanks to the LWJGL project for illustrating how to access gamma
control on the various platforms.
*/
public class Gamma {
private Gamma() {}
/**
* Sets the gamma, brightness, and contrast of the current main
* display. This functionality is not available on all platforms and
* graphics hardware. Returns true if the settings were successfully
* changed, false if not. This method may return false for some
* values of the incoming arguments even on hardware which does
* support the underlying functionality. <P>
*
* If this method returns true, the display settings will
* automatically be reset to their original values upon JVM exit
* (assuming the JVM does not crash); if the user wishes to change
* the display settings back to normal ahead of time, use {@link
* #resetDisplayGamma resetDisplayGamma}(). It is recommended to
* call {@link #resetDisplayGamma resetDisplayGamma} before calling
* e.g. <code>System.exit()</code> from the application rather than
* rely on the shutdown hook functionality due to inevitable race
* conditions and unspecified behavior during JVM teardown. <P>
*
* This method may be called multiple times during the application's
* execution, but calling {@link #resetDisplayGamma
* resetDisplayGamma} will only reset the settings to the values
* before the first call to this method. <P>
*
* @param gamma The gamma value, typically > 1.0 (default values
* vary, but typically roughly 1.0)
* @param brightness The brightness value between -1.0 and 1.0,
* inclusive (default values vary, but typically 0)
* @param contrast The contrast, greater than 0.0 (default values
* vary, but typically 1)
* @return true if gamma settings were successfully changed, false
* if not
* @throws IllegalArgumentException if any of the parameters were
* out-of-bounds
*/
public static boolean setDisplayGamma(GL gl, float gamma, float brightness, float contrast) throws IllegalArgumentException {
return GLDrawableFactoryImpl.getFactoryImpl(gl.getContext().getGLDrawable().getGLProfile()).setDisplayGamma(gamma, brightness, contrast);
}
/**
* Resets the gamma, brightness and contrast values for the primary
* display to their original values before {@link #setDisplayGamma
* setDisplayGamma} was called the first time. {@link
* #setDisplayGamma setDisplayGamma} must be called before calling
* this method or an unspecified exception will be thrown. While it
* is not explicitly required that this method be called before
* exiting, calling it is recommended because of the inevitable
* unspecified behavior during JVM teardown.
*/
public static void resetDisplayGamma(GL gl) {
GLDrawableFactoryImpl.getFactoryImpl(gl.getContext().getGLDrawable().getGLProfile()).resetDisplayGamma();
}
}
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