How to use

FrameBuffer$RenderBuffer

in

com.jme3.texture

private void updateRenderBuffer(FrameBuffer fb, RenderBuffer rb) {
  int id = rb.getId();
  if (id == -1) {
    glfbo.glGenRenderbuffersEXT(intBuf1);
    id = intBuf1.get(0);
    rb.setId(id);
  GLImageFormat glFmt = texUtil.getImageFormatWithError(rb.getFormat(), fb.isSrgb());

RenderBuffer rb = fb.getColorBuffer(fb.getTargetIndex());
if (context.boundDrawBuf != rb.getSlot()) {
  gl2.glDrawBuffer(GLFbo.GL_COLOR_ATTACHMENT0_EXT + rb.getSlot());
  context.boundDrawBuf = rb.getSlot();

leftEyeTexture = (Texture2D) getLeftViewPort().getOutputFrameBuffer().getColorBuffer().getTexture();
rightEyeTexture = (Texture2D) getRightViewPort().getOutputFrameBuffer().getColorBuffer().getTexture();
leftEyeDepth = (Texture2D) getLeftViewPort().getOutputFrameBuffer().getDepthBuffer().getTexture();
rightEyeDepth = (Texture2D) getRightViewPort().getOutputFrameBuffer().getDepthBuffer().getTexture();

@Override
public void resetObject() {
  this.id = -1;
  
  for (int i = 0; i < colorBufs.size(); i++) {
    colorBufs.get(i).resetObject();
  }
  
  if (depthBuf != null)
    depthBuf.resetObject();
  setUpdateNeeded();
}

@Override
public void resetObject() {
  this.id = -1;
  
  for (int i = 0; i < colorBufs.size(); i++) {
    colorBufs.get(i).resetObject();
  }
  
  if (depthBuf != null)
    depthBuf.resetObject();
  setUpdateNeeded();
}

public RenderBuffer createDestructableClone(){
  if (tex != null){
    return null;
  }else{
    RenderBuffer destructClone =  new RenderBuffer();
    destructClone.id = id;
    return destructClone;
  }
}

public void setDepthTexture(TextureArray tex, int layer){
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  Image img = tex.getImage();
  checkSetTexture(tex, true);
  
  depthBuf = new RenderBuffer();
  depthBuf.slot = img.getFormat().isDepthStencilFormat() ?  SLOT_DEPTH_STENCIL : SLOT_DEPTH;
  depthBuf.tex = tex;
  depthBuf.format = img.getFormat();
  depthBuf.layer = layer;
}

public RenderBuffer createDestructableClone(){
  if (tex != null){
    return null;
  }else{
    RenderBuffer destructClone =  new RenderBuffer();
    destructClone.id = id;
    return destructClone;
  }
}

private void deleteRenderBuffer(FrameBuffer fb, RenderBuffer rb) {
  intBuf1.put(0, rb.getId());
  glfbo.glDeleteRenderbuffersEXT(intBuf1);
}

private void deleteRenderBuffer(FrameBuffer fb, RenderBuffer rb) {
  intBuf1.put(0, rb.getId());
  glDeleteRenderbuffersEXT(intBuf1);
}

/**
 * Enables the use of a depth buffer for this <code>FrameBuffer</code>.
 * 
 * @param format The format to use for the depth buffer.
 * @throws IllegalArgumentException If <code>format</code> is not a depth format.
 */
public void setDepthBuffer(Image.Format format){
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  if (!format.isDepthFormat())
    throw new IllegalArgumentException("Depth buffer format must be depth.");
    
  depthBuf = new RenderBuffer();
  depthBuf.slot = format.isDepthStencilFormat() ?  SLOT_DEPTH_STENCIL : SLOT_DEPTH;
  depthBuf.format = format;
}

/**
 * Enables the use of a depth buffer for this <code>FrameBuffer</code>.
 * 
 * @param format The format to use for the depth buffer.
 * @throws IllegalArgumentException If <code>format</code> is not a depth format.
 */
public void setDepthBuffer(Image.Format format){
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  if (!format.isDepthFormat())
    throw new IllegalArgumentException("Depth buffer format must be depth.");
    
  depthBuf = new RenderBuffer();
  depthBuf.slot = -100; // -100 == special slot for DEPTH_BUFFER
  depthBuf.format = format;
}

public void updateFrameBufferAttachment(FrameBuffer fb, RenderBuffer rb) {
  boolean needAttach;
  if (rb.getTexture() == null) {
    // if it hasn't been created yet, then attach is required.
    needAttach = rb.getId() == -1;
    updateRenderBuffer(fb, rb);
  } else {
    needAttach = false;
    updateRenderTexture(fb, rb);
  }
  if (needAttach) {
    glfbo.glFramebufferRenderbufferEXT(GLFbo.GL_FRAMEBUFFER_EXT,
        convertAttachmentSlot(rb.getSlot()),
        GLFbo.GL_RENDERBUFFER_EXT,
        rb.getId());
  }
}

@Override
public void resetObject() {
  this.id = -1;
  
  for (int i = 0; i < colorBufs.size(); i++) {
    colorBufs.get(i).resetObject();
  }
  
  if (depthBuf != null)
    depthBuf.resetObject();
  setUpdateNeeded();
}

/**
 * Set the depth texture to use for this framebuffer.
 * 
 * @param tex The color texture to set.
 */
public void setDepthTexture(Texture2D tex){
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  Image img = tex.getImage();
  checkSetTexture(tex, true);
  
  depthBuf = new RenderBuffer();
  depthBuf.slot = -100; // indicates GL_DEPTH_ATTACHMENT
  depthBuf.tex = tex;
  depthBuf.format = img.getFormat();
}

leftEyeTexture  = (Texture2D) getLeftViewPort().getOutputFrameBuffer().getColorBuffer().getTexture();
rightEyeTexture = (Texture2D)getRightViewPort().getOutputFrameBuffer().getColorBuffer().getTexture();        
leftEyeDepth    = (Texture2D) getLeftViewPort().getOutputFrameBuffer().getDepthBuffer().getTexture();
rightEyeDepth   = (Texture2D)getRightViewPort().getOutputFrameBuffer().getDepthBuffer().getTexture();        

public void updateRenderTexture(FrameBuffer fb, RenderBuffer rb) {
  Texture tex = rb.getTexture();
  Image image = tex.getImage();
  if (image.isUpdateNeeded()) {
    updateTexImageData(image, tex.getType(), 0);
    // NOTE: For depth textures, sets nearest/no-mips mode
    // Required to fix "framebuffer unsupported"
    // for old NVIDIA drivers!
    setupTextureParams(tex);
  }
  glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
      convertAttachmentSlot(rb.getSlot()),
      convertTextureType(tex.getType(), image.getMultiSamples(), rb.getFace()),
      image.getId(),
      0);
}

public void updateFrameBufferAttachment(FrameBuffer fb, RenderBuffer rb) {
  boolean needAttach;
  if (rb.getTexture() == null) {
    // if it hasn't been created yet, then attach is required.
    needAttach = rb.getId() == -1;
    updateRenderBuffer(fb, rb);
  } else {
    needAttach = false;
    updateRenderTexture(fb, rb);
  }
  if (needAttach) {
    glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
        convertAttachmentSlot(rb.getSlot()),
        GL_RENDERBUFFER_EXT,
        rb.getId());
  }
}

leftEyeTexture  = (Texture2D) getLeftViewPort().getOutputFrameBuffer().getColorBuffer().getTexture();
rightEyeTexture = (Texture2D)getRightViewPort().getOutputFrameBuffer().getColorBuffer().getTexture();        
leftEyeDepth    = (Texture2D) getLeftViewPort().getOutputFrameBuffer().getDepthBuffer().getTexture();
rightEyeDepth   = (Texture2D)getRightViewPort().getOutputFrameBuffer().getDepthBuffer().getTexture();        

/**
 * Set the depth texture to use for this framebuffer.
 * 
 * @param tex The color texture to set.
 */
public void setDepthTexture(Texture2D tex){
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  Image img = tex.getImage();
  checkSetTexture(tex, true);
  
  depthBuf = new RenderBuffer();
  depthBuf.slot = img.getFormat().isDepthStencilFormat() ?  SLOT_DEPTH_STENCIL : SLOT_DEPTH;
  depthBuf.tex = tex;
  depthBuf.format = img.getFormat();
}
public void setDepthTexture(TextureArray tex, int layer){