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package com.jogamp.common.util;
/**
* Copyright 2012 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``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 JogAmp Community 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.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
/**
* Utility class providing simple signed and unsigned primitive value conversions
* for byte, short, int, float and double.
* <p>
* Non float to non float conversions are handled via float or double,
* depending on the value range.
* </p>
*/
public class ValueConv {
public static final byte float_to_byte(float v, boolean dSigned) {
// lossy
if( dSigned ) {
return (byte) ( v * ( v > 0 ? 127.0f : 128.0f ) );
} else {
return (byte) ( v * 255.0f );
}
}
public static final short float_to_short(float v, boolean dSigned) {
if( dSigned ) {
return (short) ( v * ( v > 0 ? 32767.0f : 32768.0f ) );
} else {
return (short) ( v * 65535.0f );
}
}
public static final int float_to_int(float v, boolean dSigned) {
// float significand 0x007fffff
// double significand 0x000fffffffffffffL
// int min = 0x80000000 = -2147483648
// int max = 0x7fffffff = +2147483647
if( dSigned ) {
return (int) ( v * ( v > 0 ? 2147483647.0 : 2147483648.0 ) );
} else {
return (int) (long) ( v * 4294967295.0 );
}
}
public static final byte double_to_byte(double v, boolean dSigned) {
// lossy
if( dSigned ) {
return (byte) ( v * ( v > 0 ? 127.0 : 128.0 ) );
} else {
return (byte) ( v * 255.0 );
}
}
public static final short double_to_short(double v, boolean dSigned) {
// lossy
if( dSigned ) {
return (short) ( v * ( v > 0 ? 32767.0 : 32768.0 ) );
} else {
return (short) ( v * 65535.0 );
}
}
public static final int double_to_int(double v, boolean dSigned) {
// lossy
if( dSigned ) {
return (int) ( v * ( v > 0 ? 2147483647.0 : 2147483648.0 ) );
} else {
return (int) (long) ( v * 4294967295.0 );
}
}
public static final float byte_to_float(byte v, boolean sSigned) {
if( sSigned ) {
return (v & 0xff) / ( v > 0 ? 127.0f : -128.0f ) ;
} else {
return (v & 0xff) / 255.0f ;
}
}
public static final double byte_to_double(byte v, boolean sSigned) {
if( sSigned ) {
return (v & 0xff) / ( v > 0 ? 127.0 : -128.0 ) ;
} else {
return (v & 0xff) / 255.0 ;
}
}
public static final float short_to_float(short v, boolean sSigned) {
if( sSigned ) {
return (v & 0xffff) / ( v > 0 ? 32767.0f : -32768.0f ) ;
} else {
return (v & 0xffff) / 65535.0f ;
}
}
public static final double short_to_double(short v, boolean sSigned) {
// lossy
if( sSigned ) {
return (v & 0xffff) / ( v > 0 ? 32767.0 : -32768.0 ) ;
} else {
return (v & 0xffff) / 65535.0 ;
}
}
public static final float int_to_float(int v, boolean sSigned) {
// lossy
// float significand 0x007fffff
// double significand 0x000fffffffffffffL
// int min = 0x80000000 = -2147483648
// int max = 0x7fffffff = +2147483647
if( sSigned ) {
return (float) ( v / ( v > 0 ? 2147483647.0 : 2147483648.0 ) );
} else {
return (float) ( ((long)v & 0xffffffffL) / 4294967295.0 );
}
}
public static final double int_to_double(int v, boolean sSigned) {
if( sSigned ) {
return v / ( v > 0 ? 2147483647.0 : 2147483648.0 ) ;
} else {
return ((long)v & 0xffffffffL) / 4294967295.0 ;
}
}
public static final short byte_to_short(byte v, boolean sSigned, boolean dSigned) {
return float_to_short(byte_to_float(v, sSigned), dSigned);
}
public static final int byte_to_int(byte v, boolean sSigned, boolean dSigned) {
return float_to_int(byte_to_float(v, sSigned), dSigned);
}
public static final byte short_to_byte(short v, boolean sSigned, boolean dSigned) {
return float_to_byte(short_to_float(v, sSigned), dSigned);
}
public static final int short_to_int(short v, boolean sSigned, boolean dSigned) {
return float_to_int(short_to_float(v, sSigned), dSigned);
}
public static final byte int_to_byte(int v, boolean sSigned, boolean dSigned) {
return float_to_byte(int_to_float(v, sSigned), dSigned);
}
public static final short int_to_short(int v, boolean sSigned, boolean dSigned) {
return float_to_short(int_to_float(v, sSigned), dSigned);
}
}
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