LWJGL Forum

Hi,
I used my FrameBufferObject class for a long time and it all worked fine. But know I need the depth texture from the framebuffer and this doesnt work.
I just receive a black Image.
Here is the code of my FrameBufferObject class:
package com.dotcookie.engine.shaders;

import static org.lwjgl.opengl.GL11.GL_COLOR_BUFFER_BIT;
import static org.lwjgl.opengl.GL11.GL_DEPTH_BUFFER_BIT;
import static org.lwjgl.opengl.GL11.GL_DEPTH_COMPONENT;
import static org.lwjgl.opengl.GL11.GL_RGBA;
import static org.lwjgl.opengl.GL11.GL_RGBA8;
import static org.lwjgl.opengl.GL11.GL_TEXTURE_2D;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.GL11.GL_UNSIGNED_BYTE;
import static org.lwjgl.opengl.GL11.GL_VIEWPORT_BIT;

import org.lwjgl.opengl.GL;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL30;

import static org.lwjgl.opengl.GL30.*;

public class FrameBufferObject {

    public static boolean isSupported() {
return GL.getCapabilities().OpenGL30 || GL.getCapabilities().GL_EXT_framebuffer_object;
    }

    int fbo;
    int depthbuffer;
    int fb_texture, depth_texture;
    private int width, height;


    public FrameBufferObject(int width, int height) {
this.width = width;
this.height = height;

fb_texture = glGenTextures();
glBindTexture(GL_TEXTURE_2D, fb_texture);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0,GL_RGBA8, width, height, 0, GL_RGBA,GL_UNSIGNED_BYTE,(java.nio.ByteBuffer) null);

depth_texture = glGenTextures();
glBindTexture(GL_TEXTURE_2D, depth_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, width, height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);

glBindTexture(GL_TEXTURE_2D, 0);

// frame buffer fbo = glGenFramebuffers(); depthbuffer
fbo =glGenFramebuffers();
glBindFramebuffer(GL_FRAMEBUFFER, fbo);

depthbuffer = glGenRenderbuffers();
glBindRenderbuffer(GL_RENDERBUFFER, depthbuffer);

glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4, GL_DEPTH24_STENCIL8, width, height);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthbuffer);

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb_texture, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL30.GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT, depth_texture, 0);

if (glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE) {
    System.out.println("Frame buffer created sucessfully.");
} else
    System.out.println("An error occured creating the frame buffer.");
glBindFramebuffer(GL_FRAMEBUFFER, 0);
    }

    public int getWidth() {
return width;
    }

    public int getHeight() {
return height;
    }

    public int getID() {
return this.fbo;
    }

    public int getTexture() {
return this.fb_texture;
    }

    public int getDepthTexture() {
return this.depth_texture;
    }

    public void bind() {
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glPushAttrib(GL_VIEWPORT_BIT);
glViewport(0, 0, width, height);

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
GL11.glClearColor(120 / 255f, 167 / 255f, 223 / 255f, 1f);
    }

    public void unbind() {
glBindFramebuffer(GL_FRAMEBUFFER, 0);
    }

    public void release() {
GL11.glDeleteTextures(depth_texture);
GL11.glDeleteTextures(this.fb_texture);
GL30.glDeleteFramebuffers(fbo);
GL30.glDeleteRenderbuffers(depthbuffer);
    }
}

My rendering process is something like this:
public void render(float delta) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
GL11.glClearColor(120 / 255f, 167 / 255f, 223 / 255f, 1f);

buffer.bind();
        //drawing a simple model with texture

buffer.unbind();

        GL11.glBindTexture(GL11.GL_TEXTURE_2D, depthbuffer.getRefractionDepthTexture());
//drawing simple rectangle on screen
    }

For the color buffer this works perfectly fine, but the depth buffer texture is just black.

Any suggestions what I did wrong?

Thanks for helping :)