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();

for (int i = 0; i < context.boundFB.getNumColorBuffers(); i++) {
  RenderBuffer rb = context.boundFB.getColorBuffer(i);
  Texture tex = rb.getTexture();
  if (tex != null
      && tex.getMinFilter().usesMipMapLevels()) {
    setTexture(0, rb.getTexture());
    int textureType = convertTextureType(tex.getType(), tex.getImage().getMultiSamples(), rb.getFace());
    glEnable(textureType);
    glGenerateMipmapEXT(textureType);
    RenderBuffer rb = fb.getColorBuffer(fb.getTargetIndex());
    if (context.boundDrawBuf != rb.getSlot()) {
      glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT + rb.getSlot());
      context.boundDrawBuf = rb.getSlot();

glReadBuffer(GL_COLOR_ATTACHMENT0_EXT + rb.getSlot());

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

glReadBuffer(GL_COLOR_ATTACHMENT0_EXT + rb.getSlot());

Format depthFmt = depthBuf.getFormat();
if (!depthFmt.isDepthFormat()){
  return false;
Format colorFmt = colorBuf.getFormat();
if (colorFmt.isDepthFormat())
  return false;

for (int i = 0; i < context.boundFB.getNumColorBuffers(); i++) {
  RenderBuffer rb = context.boundFB.getColorBuffer(i);
  Texture tex = rb.getTexture();
  if (tex != null
      && tex.getMinFilter().usesMipMapLevels()) {
    setTexture(0, rb.getTexture());
    int textureType = convertTextureType(tex.getType(), tex.getImage().getMultiSamples(), rb.getFace());
    glfbo.glGenerateMipmapEXT(textureType);

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());

Format depthFmt = depthBuf.getFormat();
if (!depthFmt.isDepthFormat()){
  return false;

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

/**
 * Creates a shared image object from a jME3 render buffer.
 * The returned image shares the same memory with the jME3 render buffer, changes
 * in one view are visible in the other view.
 * <br>
 * This can be used as an alternative to post processing effects
 * (e.g. reduce sum operations, needed e.g. for tone mapping).
 * <br>
 * <b>Note:</b> The renderbuffer must already been uploaded to the GPU,
 * i.e. it must be used at least once for drawing.
 * <p>
 * Before the returned image can be used, it must be acquried explicitly
 * by {@link Image#acquireImageForSharingAsync(com.jme3.opencl.CommandQueue) }
 * and after modifying it, released by {@link Image#releaseImageForSharingAsync(com.jme3.opencl.CommandQueue) }
 * This is needed so that OpenGL and OpenCL operations do not interfer with each other.
 * 
 * @param buffer
 * @param access
 * @return 
 */
public Image bindRenderBuffer(FrameBuffer.RenderBuffer buffer, MemoryAccess access) {
  if (buffer.getTexture() == null) {
    return bindPureRenderBuffer(buffer, access);
  } else {
    return bindImage(buffer.getTexture(), access);
  }
}
protected abstract Image bindPureRenderBuffer(FrameBuffer.RenderBuffer buffer, MemoryAccess access);

private void printRealRenderBufferInfo(FrameBuffer fb, RenderBuffer rb, String name) {
  System.out.println("== Renderbuffer " + name + " ==");
  System.out.println("RB ID: " + rb.getId());
  System.out.println("Is proper? " + glIsRenderbufferEXT(rb.getId()));
  int attachment = convertAttachmentSlot(rb.getSlot());
  int type = glGetFramebufferAttachmentParameteriEXT(GL_DRAW_FRAMEBUFFER_EXT,
      attachment,
      GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE_EXT);
  int rbName = glGetFramebufferAttachmentParameteriEXT(GL_DRAW_FRAMEBUFFER_EXT,
      attachment,
      GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME_EXT);
  switch (type) {
    case GL_NONE:
      System.out.println("Type: None");
      break;
    case GL_TEXTURE:
      System.out.println("Type: Texture");
      break;
    case GL_RENDERBUFFER_EXT:
      System.out.println("Type: Buffer");
      System.out.println("RB ID: " + rbName);
      break;
  }
}

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

 /**
 * Add a color texture to use for this framebuffer.
 * If MRT is enabled, then each subsequently added texture can be
 * rendered to through a shader that writes to the array <code>gl_FragData</code>.
 * If MRT is not enabled, then the index set with {@link FrameBuffer#setTargetIndex(int) }
 * is rendered to by the shader.
 *
 * @param tex The cube-map texture to add.
 * @param face The face of the cube-map to render to.
 */
public void addColorTexture(TextureCubeMap tex, TextureCubeMap.Face face) {
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  Image img = tex.getImage();
  checkSetTexture(tex, false);
  RenderBuffer colorBuf = new RenderBuffer();
  colorBuf.slot = colorBufs.size();
  colorBuf.tex = tex;
  colorBuf.format = img.getFormat();
  colorBuf.face = face.ordinal();
  colorBufs.add(colorBuf);
}

/**
 * Add a color texture to use for this framebuffer.
 * If MRT is enabled, then each subsequently added texture can be
 * rendered to through a shader that writes to the array <code>gl_FragData</code>.
 * If MRT is not enabled, then the index set with {@link FrameBuffer#setTargetIndex(int) }
 * is rendered to by the shader.
 * 
 * @param tex The texture to add.
 * @see #addColorBuffer(com.jme3.texture.Image.Format) 
 */
public void addColorTexture(Texture2D tex) {
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  Image img = tex.getImage();
  checkSetTexture(tex, false);
  RenderBuffer colorBuf = new RenderBuffer();
  colorBuf.slot = colorBufs.size();
  colorBuf.tex = tex;
  colorBuf.format = img.getFormat();
  colorBufs.add(colorBuf);
}

/**
 * Add a color texture array to use for this framebuffer.
 * If MRT is enabled, then each subsequently added texture can be
 * rendered to through a shader that writes to the array <code>gl_FragData</code>.
 * If MRT is not enabled, then the index set with {@link FrameBuffer#setTargetIndex(int) }
 * is rendered to by the shader.
 * 
 * @param tex The texture array to add.
 */
public void addColorTexture(TextureArray tex, int layer) {
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  Image img = tex.getImage();
  checkSetTexture(tex, false);
  RenderBuffer colorBuf = new RenderBuffer();
  colorBuf.slot = colorBufs.size();
  colorBuf.tex = tex;
  colorBuf.format = img.getFormat();
  colorBuf.layer = layer;
  colorBufs.add(colorBuf);
}

/**
 * Add a color buffer without a texture bound to it.
 * If MRT is enabled, then each subsequently added texture or buffer can be
 * rendered to through a shader that writes to the array <code>gl_FragData</code>.
 * If MRT is not enabled, then the index set with {@link FrameBuffer#setTargetIndex(int) }
 * is rendered to by the shader.
 * 
 * @param format the format of the color buffer
 * @see #addColorTexture(com.jme3.texture.Texture2D) 
 */
public void addColorBuffer(Image.Format format){
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  if (format.isDepthFormat())
    throw new IllegalArgumentException("Color buffer format must be color/luminance.");
  
  RenderBuffer colorBuf = new RenderBuffer();
  colorBuf.slot = colorBufs.size();
  colorBuf.format = format;
  
  colorBufs.add(colorBuf);
}

/**
 * Add a color texture to use for this framebuffer.
 * If MRT is enabled, then each subsequently added texture can be
 * rendered to through a shader that writes to the array <code>gl_FragData</code>.
 * If MRT is not enabled, then the index set with {@link FrameBuffer#setTargetIndex(int) }
 * is rendered to by the shader.
 * 
 * @param tex The texture to add.
 */
public void addColorTexture(Texture2D tex) {
  if (id != -1)
    throw new UnsupportedOperationException("FrameBuffer already initialized.");
  Image img = tex.getImage();
  checkSetTexture(tex, false);
  RenderBuffer colorBuf = new RenderBuffer();
  colorBuf.slot = colorBufs.size();
  colorBuf.tex = tex;
  colorBuf.format = img.getFormat();
  colorBufs.add(colorBuf);
}