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/*
* Copyright (c) 2008 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.
*
*/
package demos.readbuffer;
import java.nio.*;
import javax.media.opengl.*;
import com.sun.opengl.util.texture.Texture;
import com.sun.opengl.util.texture.TextureData;
import com.sun.opengl.util.BufferUtil;
public class ReadBufferUtil {
protected int readPixelSizeLast = 0;
protected Buffer readPixelBuffer = null;
protected TextureData readTextureData = null;
protected Texture readTexture = new Texture(GL.GL_TEXTURE_2D);
public Buffer getPixelBuffer() { return readPixelBuffer; }
public void rewindPixelBuffer() { readPixelBuffer.rewind(); }
public TextureData getTextureData() { return readTextureData; }
public Texture getTexture() { return readTexture; }
public boolean isValid() {
return null!=readTexture && null!=readTextureData && null!=readPixelBuffer ;
}
public void fetchOffscreenTexture(GLDrawable drawable, GL gl) {
int readPixelSize = drawable.getWidth() * drawable.getHeight() * 3 ; // RGB
boolean newData = false;
if(readPixelSize>readPixelSizeLast) {
readPixelBuffer = BufferUtil.newGLBuffer(gl.GL_UNSIGNED_BYTE, readPixelSize);
readPixelSizeLast = readPixelSize ;
try {
readTextureData = new TextureData(
gl.getGLProfile(),
// gl.isGL2GL3()?gl.GL_RGBA:gl.GL_RGB,
gl.GL_RGB,
drawable.getWidth(), drawable.getHeight(),
0,
gl.GL_RGB,
gl.GL_UNSIGNED_BYTE,
false, false,
false /* flip */,
readPixelBuffer,
null /* Flusher */);
newData = true;
} catch (Exception e) {
e.printStackTrace();
readTextureData = null;
readPixelBuffer = null;
readPixelSizeLast = 0;
}
}
if(null!=readPixelBuffer) {
readPixelBuffer.clear();
gl.glReadPixels(0, 0, drawable.getWidth(), drawable.getHeight(), GL.GL_RGB, GL.GL_UNSIGNED_BYTE, readPixelBuffer);
readPixelBuffer.rewind();
if(newData) {
readTexture.updateImage(readTextureData);
} else {
readTexture.updateSubImage(readTextureData, 0,
0, 0, // src offset
0, 0, // dst offset
drawable.getWidth(), drawable.getHeight());
}
readPixelBuffer.rewind();
}
}
public void dispose() {
readTexture.dispose();
readTextureData = null;
readPixelBuffer.clear();
readPixelBuffer = null;
readPixelSizeLast = 0;
}
}
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