OpenGL/OpenCL kernel wird nicht ausgefürt

  gcc (Ubuntu 4.9.2-0ubuntu1~14.04) 4.9.2

  CL_DEVICE_NAME:        GeForce GT 650M

  CL_DEVICE_VENDOR:      NVIDIA Corporation

  CL_DEVICE_VERSION:     OpenCL 1.1 CUDA

  CL_DEVICE_TYPE:        CL_DEVICE_TYPE_GPU

  CL_DRIVER_VERSION:     331.38

  CL_DEVICE_PROFILE:     FULL_PROFILE

  CL_DEVICE_MAX_COMPUTE_UNITS:   2

  CL_DEVICE_MAX_CLOCK_FREQUENCY:         835

  CL_DEVICE_MEM_BASE_ADDR_ALIGN:         4096

  CL_DEVICE_MIN_DATA_TYPE_ALIGN_SIZE:    128

  while(1){

    size_t fb_size[] = {

      w->winWidth,w->winHeight,0

    };

    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, w->buffer.gl_frame);

    glClear(GL_COLOR_BUFFER_BIT);

    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0 );

    glFinish();

    clEnqueueAcquireGLObjects(w->clCommandQueue,1,&w->buffer.cl_color,0,0,0);

    clSetKernelArg(w->kernel.raytracer_drawScene, 0, sizeof(cl_mem), &w->buffer.cl_color);

    clEnqueueNDRangeKernel( w->clCommandQueue, w->kernel.raytracer_drawScene, 1, 0, fb_size, 0, 0, 0, 0 );

    clEnqueueReleaseGLObjects(w->clCommandQueue,1,&w->buffer.cl_color,0,0,0);

    clFinish(w->clCommandQueue);

    glBlitFramebuffer(0,0,w->winWidth, w->winHeight,0,0,w->winWidth, w->winHeight,GL_COLOR_BUFFER_BIT,GL_NEAREST);

  }

kernel void raytracer_drawScene(global write_only image2d_t fb){

  const int2 xy = {

    get_global_id(0),

    get_global_id(1)

  };

  const uint4 color = { 255,0, 0, 127 };

  write_imageui(fb, xy, color);

}