private static void setupShadowFrameBuffer()
  {
    if (usedShadowDepthBuffers == 0)
    {
      return;
    }

    if (sfb != 0)
    {
      glDeleteFramebuffersEXT(sfb);
      GlStateManager.deleteTextures(sfbDepthTextures);
      GlStateManager.deleteTextures(sfbColorTextures);
    }

    sfb = glGenFramebuffersEXT();
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, sfb);
    glDrawBuffer(GL_NONE);
    glReadBuffer(GL_NONE);

    glGenTextures((IntBuffer) sfbDepthTextures.clear().limit(usedShadowDepthBuffers));
    glGenTextures((IntBuffer) sfbColorTextures.clear().limit(usedShadowColorBuffers));
    //printIntBuffer(sfbDepthTextures);
    //printIntBuffer(sfbColorTextures);
    sfbDepthTextures.position(0);
    sfbColorTextures.position(0);

    // depth
    for (int i = 0; i < usedShadowDepthBuffers; ++i)
    {
      GlStateManager.bindTexture(sfbDepthTextures.get(i));
      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
      int filter = shadowFilterNearest[i] ? GL_NEAREST : GL_LINEAR;
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
      if (shadowHardwareFilteringEnabled[i])
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
      glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, shadowMapWidth, shadowMapHeight, 0, GL_DEPTH_COMPONENT, GL11.GL_FLOAT, (FloatBuffer) null);
    }
    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, sfbDepthTextures.get(0), 0);
    checkGLError("FT sd");

    // color shadow
    for (int i = 0; i < usedShadowColorBuffers; ++i)
    {
      GlStateManager.bindTexture(sfbColorTextures.get(i));
      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
      int filter = shadowColorFilterNearest[i] ? GL_NEAREST : GL_LINEAR;
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, shadowMapWidth, shadowMapHeight, 0, GL12.GL_BGRA, GL12.GL_UNSIGNED_INT_8_8_8_8_REV, (ByteBuffer) null);
      glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT + i, GL_TEXTURE_2D, sfbColorTextures.get(i), 0);
      checkGLError("FT sc");
    }

    GlStateManager.bindTexture(0);

    if (usedShadowColorBuffers > 0)
    {
      //glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
      glDrawBuffers(Shaders.sfbDrawBuffers);
    }

    int status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
    if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
    {
      printChatAndLogError("[Shaders] Error: Failed creating shadow framebuffer! (Status " + status + ")");
    }
    else
    {
      SMCLog.info("Shadow framebuffer created.");
    }
  }