/*
 * @(#)gl_pixel_transfer.java 0.1 99/12/17
 *
 * jGL 3-D graphics library for Java
 * Copyright (c) 1999 Robin Bing-Yu Chen (robin@is.s.u-tokyo.ac.jp)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version. the GNU Lesser
 * General Public License should be included with this distribution
 * in the file LICENSE.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 */

package jgl.context.attrib.pixel;

import jgl.context.gl_util;

/**
 * gl_pixel_transfer is the pixel transfer class of JavaGL 2.1.
 *
 * @version 	0.1, 17 Dec 1999
 * @author 	Robin Bing-Yu Chen
 */

public class gl_pixel_transfer {

    /** GL_x_SCALE: Value of GL_x_SCALE */
    public float Scale = 1;

    /** GL_x_BIAS: Value of GL_x_BIAS */
    public float Bias = 0;
    
    public float apply_bias_scale (float value) {
    	float temp = value * Scale + Bias;
	return gl_util.CLAMP (temp, 0.0f, 1.0f);
    }
    
    public byte apply_bias_scale (byte value) {
    	float temp = ((float)value/255.0f) * Scale + Bias;
	temp = gl_util.CLAMP (temp, 0.0f, 1.0f);
	return (byte)(temp*255.0f);
    }

}