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/**
* Copyright 2010 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.
*/
package com.jogamp.opengl.util;
import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GL2ES2;
import javax.media.opengl.GLException;
/**
* Utility to safely set and restore the pack and unpack pixel storage mode,
* regardless of the GLProfile.
*/
public class GLPixelStorageModes {
int savedPackAlignment;
int savedUnpackAlignment;
int[] tmp = new int[1];
boolean saved = false;
static int glGetInteger(GL gl, int pname, int[] tmp) {
gl.glGetIntegerv(pname, tmp, 0);
return tmp[0];
}
private final void save(GL gl) {
if(gl.isGL2()) {
gl.getGL2().glPushClientAttrib(GL2.GL_CLIENT_PIXEL_STORE_BIT);
gl.glPixelStorei(GL2.GL_PACK_ROW_LENGTH, 0);
gl.glPixelStorei(GL2.GL_PACK_SKIP_ROWS, 0);
gl.glPixelStorei(GL2.GL_PACK_SKIP_PIXELS, 0);
gl.glPixelStorei(GL2.GL_PACK_SWAP_BYTES, 0);
} else {
// core and embedded only deal with pack/unpack alignment
savedPackAlignment = glGetInteger(gl, GL2ES2.GL_PACK_ALIGNMENT, tmp);
savedUnpackAlignment = glGetInteger(gl, GL2ES2.GL_UNPACK_ALIGNMENT, tmp);
}
saved = true;
}
/**
* Sets the {@link GL2ES2.GL_PACK_ALIGNMENT}. Saves the pixel storage modes if not saved yet.
*/
public final void setPackAlignment(GL gl, int packAlignment) {
if(!saved) { save(gl); }
gl.glPixelStorei(GL2ES2.GL_PACK_ALIGNMENT, packAlignment);
}
/**
* Sets the {@link GL2ES2.GL_UNPACK_ALIGNMENT}. Saves the pixel storage modes if not saved yet.
*/
public final void setUnpackAlignment(GL gl, int unpackAlignment) {
if(!saved) { save(gl); }
gl.glPixelStorei(GL2ES2.GL_UNPACK_ALIGNMENT, unpackAlignment);
}
/**
* Sets the {@link GL2ES2.GL_PACK_ALIGNMENT} and {@link GL2ES2.GL_UNPACK_ALIGNMENT}.
* Saves the pixel storage modes if not saved yet.
*/
public final void setAlignment(GL gl, int packAlignment, int unpackAlignment) {
setPackAlignment(gl, packAlignment);
setUnpackAlignment(gl, unpackAlignment);
}
/**
* Restores the pixel storage mode.
* @throws GLException if not saved via one of the set methods.
*/
public final void restore(GL gl) throws GLException {
if(!saved) {
throw new GLException("pixel storage modes not saved");
}
if(gl.isGL2()) {
gl.getGL2().glPopClientAttrib();
} else {
gl.glPixelStorei(GL2ES2.GL_PACK_ALIGNMENT, savedPackAlignment);
}
saved = false;
}
}
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