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/*
* 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.
*/
/*
* Copyright (c) 2003 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.
*/
package com.sun.opengl.impl;
import java.nio.IntBuffer;
import javax.media.opengl.*;
/**
* Util.java
* <p/>
* <p/>
* Created 7-jan-2004
*
* @author Erik Duijs
*/
class Util {
/**
* temp int[] of one for getting an int from some GL functions
*/
private int[] scratch = new int[1];
/**
* Return ceiling of integer division
*
* @param a
* @param b
*
* @return int
*/
protected static int ceil(int a, int b) {
return (a % b == 0 ? a / b : a / b + 1);
}
/**
* Method compPerPix.
*
* @param format
*
* @return int
*/
protected static int compPerPix(int format) {
/* Determine number of components per pixel */
switch ( format ) {
case GL.GL_COLOR_INDEX:
case GL.GL_STENCIL_INDEX:
case GL.GL_DEPTH_COMPONENT:
case GL.GL_RED:
case GL.GL_GREEN:
case GL.GL_BLUE:
case GL.GL_ALPHA:
case GL.GL_LUMINANCE:
return 1;
case GL.GL_LUMINANCE_ALPHA:
return 2;
case GL.GL_RGB:
case GL.GL_BGR:
return 3;
case GL.GL_RGBA:
case GL.GL_BGRA:
return 4;
default :
return -1;
}
}
/**
* Method nearestPower.
* <p/>
* Compute the nearest power of 2 number. This algorithm is a little strange, but it works quite well.
*
* @param value
*
* @return int
*/
protected static int nearestPower(int value) {
int i;
i = 1;
/* Error! */
if ( value == 0 )
return -1;
for ( ; ; ) {
if ( value == 1 ) {
return i;
} else if ( value == 3 ) {
return i << 2;
}
value >>= 1;
i <<= 1;
}
}
/**
* Method bytesPerPixel.
*
* @param format
* @param type
*
* @return int
*/
protected static int bytesPerPixel(int format, int type) {
int n, m;
switch ( format ) {
case GL.GL_COLOR_INDEX:
case GL.GL_STENCIL_INDEX:
case GL.GL_DEPTH_COMPONENT:
case GL.GL_RED:
case GL.GL_GREEN:
case GL.GL_BLUE:
case GL.GL_ALPHA:
case GL.GL_LUMINANCE:
n = 1;
break;
case GL.GL_LUMINANCE_ALPHA:
n = 2;
break;
case GL.GL_RGB:
case GL.GL_BGR:
n = 3;
break;
case GL.GL_RGBA:
case GL.GL_BGRA:
n = 4;
break;
default :
n = 0;
}
switch ( type ) {
case GL.GL_UNSIGNED_BYTE:
m = 1;
break;
case GL.GL_BYTE:
m = 1;
break;
case GL.GL_BITMAP:
m = 1;
break;
case GL.GL_UNSIGNED_SHORT:
m = 2;
break;
case GL.GL_SHORT:
m = 2;
break;
case GL.GL_UNSIGNED_INT:
m = 4;
break;
case GL.GL_INT:
m = 4;
break;
case GL.GL_FLOAT:
m = 4;
break;
default :
m = 0;
}
return n * m;
}
/**
* Convenience method for returning an int, rather than getting it out of a buffer yourself.
*
* @param what
*
* @return int
*/
protected int glGetIntegerv(GL gl, int what) {
gl.glGetIntegerv(what, scratch, 0);
return scratch[0];
}
}
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