I try to make a realtime depth of field for Processing and for this I need to get the depthinformation into a texture to use ist in a textureShader. I'm rendering the scene in an GLGraphicsOffScreen. I can easy get the colortexture with .getTexture();, but now I need the depth information in a texture for my shader.

Like it was mentioned in another thread I made an CustomOffScreen to get the buffer ID:

2. class CustomOffScreen extends GLGraphicsOffScreen {  
3.   public CustomOffScreen(PApplet parent, int iwidth, int iheight, boolean multi, int level) {
4.     super(parent, iwidth, iheight, multi, level);
5.   }
6.   public CustomOffScreen(PApplet parent, int iwidth, int iheight) {
7.     super(parent, iwidth, iheight);
8.   }
9.   int getDepthBuffer() {
10.     return depthStencilBuffer;
11.   }
12. }

But here I am lost. How can I acces the information? 

Here is what I tried.

2. public GLTexture getDepthTexture() {  
3.     PGraphicsOpenGL pogl = (PGraphicsOpenGL) g;
4.     
5.     java.nio.FloatBuffer zbuff = java.nio.ByteBuffer.allocateDirect(width*height*4).order(java.nio.ByteOrder.nativeOrder()).asFloatBuffer();
6.     pogl.gl.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, getDepthBuffer());
7.     pogl.gl.glReadPixels( 0, 0, width, height, GL.GL_DEPTH_COMPONENT, GL.GL_FLOAT, zbuff);
8.     pogl.gl.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, 0);
9.   
10.     depthTex = new GLTexture(parent, width, height);
11.     depthTex.loadPixels();
12.   
13.     for(int i = 0; i<width; i++){
14.     for(int j = 0; j<height; j++){
15.       depthTex.pixels[j*width+i] = color((zbuff.get(((height-j-1)*width)+i))*255);
16.     }
17.   }
18.   depthTex.updatePixels();
19.   return depthTex; 
20.   }

Thanks, Michi