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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 com.jogamp.common.nio.Buffers;
import java.io.File;
import java.io.IOException;
import java.nio.*;
import javax.media.opengl.*;
import com.jogamp.opengl.util.texture.Texture;
import com.jogamp.opengl.util.texture.TextureData;
import com.jogamp.opengl.util.texture.TextureIO;
/**
* Utility to read out the current FB to TextureData, optionally writing the data back to a texture object.
* <p>May be used directly to write the TextureData to file (screenshot).</p>
*/
public class GLReadBufferUtil {
protected final int components, alignment;
protected final Texture readTexture;
protected final GLPixelStorageModes psm;
protected int readPixelSizeLast = 0;
protected ByteBuffer readPixelBuffer = null;
protected TextureData readTextureData = null;
/**
* @param alpha true for RGBA readPixels, otherwise RGB readPixels
* @param write2Texture true if readPixel's TextureData shall be written to a 2d Texture
*/
public GLReadBufferUtil(boolean alpha, boolean write2Texture) {
components = alpha ? 4 : 3 ;
alignment = alpha ? 4 : 1 ;
readTexture = write2Texture ? new Texture(GL.GL_TEXTURE_2D) : null ;
psm = new GLPixelStorageModes();
}
public boolean isValid() {
return null!=readTextureData && null!=readPixelBuffer ;
}
/**
* @return the raw pixel ByteBuffer, filled by {@link #readPixels(GLAutoDrawable, boolean)}
*/
public ByteBuffer getPixelBuffer() { return readPixelBuffer; }
/**
* rewind the raw pixel ByteBuffer
*/
public void rewindPixelBuffer() { if( null != readPixelBuffer ) { readPixelBuffer.rewind(); } }
/**
* @return the resulting TextureData, filled by {@link #readPixels(GLAutoDrawable, boolean)}
*/
public TextureData getTextureData() { return readTextureData; }
/**
* @return the Texture object filled by {@link #readPixels(GLAutoDrawable, boolean)},
* if this instance writes to a 2d Texture, otherwise null.
* @see #GLReadBufferUtil(boolean, boolean)
*/
public Texture getTexture() { return readTexture; }
/**
* Write the TextureData filled by {@link #readPixels(GLAutoDrawable, boolean)} to file
*/
public void write(File dest) {
try {
TextureIO.write(readTextureData, dest);
rewindPixelBuffer();
} catch (IOException ex) {
throw new RuntimeException("can not write to file: " + dest.getAbsolutePath(), ex);
}
}
/**
* Read the drawable's pixels to TextureData and Texture, if requested at construction
*
* @param gl the current GL object
* @param drawable the drawable to read from
* @param flip weather to flip the data vertically or not
*
* @see #GLReadBufferUtil(boolean, boolean)
*/
public void readPixels(GL gl, GLDrawable drawable, boolean flip) {
final int textureInternalFormat, textureDataFormat;
final int textureDataType = GL.GL_UNSIGNED_BYTE;
if(4 == components) {
textureInternalFormat=GL.GL_RGBA;
textureDataFormat=GL.GL_RGBA;
} else {
textureInternalFormat=GL.GL_RGB;
textureDataFormat=GL.GL_RGB;
}
final int readPixelSize = drawable.getWidth() * drawable.getHeight() * components ;
boolean newData = false;
if(readPixelSize>readPixelSizeLast) {
readPixelBuffer = Buffers.newDirectByteBuffer(readPixelSize);
readPixelSizeLast = readPixelSize ;
try {
readTextureData = new TextureData(
gl.getGLProfile(),
textureInternalFormat,
drawable.getWidth(), drawable.getHeight(),
0,
textureDataFormat,
textureDataType,
false, false,
flip,
readPixelBuffer,
null /* Flusher */);
newData = true;
} catch (Exception e) {
readTextureData = null;
readPixelBuffer = null;
readPixelSizeLast = 0;
throw new RuntimeException("can not fetch offscreen texture", e);
}
}
if(null!=readPixelBuffer) {
psm.setAlignment(gl, alignment, alignment);
readPixelBuffer.clear();
gl.glReadPixels(0, 0, drawable.getWidth(), drawable.getHeight(), textureDataFormat, textureDataType, readPixelBuffer);
readPixelBuffer.rewind();
if(null != readTexture) {
if(newData) {
readTexture.updateImage(gl, readTextureData);
} else {
readTexture.updateSubImage(gl, readTextureData, 0,
0, 0, // src offset
0, 0, // dst offset
drawable.getWidth(), drawable.getHeight());
}
readPixelBuffer.rewind();
}
psm.restore(gl);
}
}
public void dispose(GL gl) {
if(null != readTexture) {
readTexture.destroy(gl);
readTextureData = null;
}
if(null != readPixelBuffer) {
readPixelBuffer.clear();
readPixelBuffer = null;
}
readPixelSizeLast = 0;
}
}
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