graph {
  host [label = "host", shape=box]
  firmware [label = "firmware", shape=box]
  arg1 [label = "int* input_buffer_1"]
  arg2 [label = "int* input_buffer_2"]
  arg3 [label = "int* output_buffer"]
  arg4 [label = "int* status"]
  arg5 [label = "const unsigned int buffer_size"]
  init [label = "init_driver",shape=box]
  CLO1 [label = "CLObject*"]
  run_driver [label = "run_driver()", shape=box]
  config_routine [label = "c1SetKerelArg()", shape=box]
  create_buffer [label = "c1CreateBuffer()", shape=box]
  buffer [label = "Buffer Object"]
  enque [label = "c1EnqueueBuffer()", shape=box]
  kernel [label = "clEnqueueNDRangeKernel()", shape=box]
  host -- firmware[label = "Runs", dir=forward]
  host -- arg1,arg2,arg3,arg4,arg5[label = "provides", dir=forward, color=red]
  arg1,arg2,arg3,arg4,arg5 -- firmware[label = "takes", dir=forward,color=red]
  firmware -- init[label = "Calls", dir=forward]
  init -- CLO1[label = "Returns", dir=forward]
  CLO1 -- firmware[label = "To", dir=forward]
  firmware -- CL01[label = "Passes", dir=forward, color = red]
  firmware -- run_driver[label = "Calls", dir=forward]
  CL01 -- run_driver[label = "To", dir=forward, color = red]
  run_driver -- config_routine[label="configures device with", dir=forward]
  run_driver -- create_buffer[label="calls", dir=forward]
  create_buffer -- buffer[label="creates", dir=forward]
  buffer -- run_driver[label="returns",dir=forward]
  run_driver -- enqueue[label="calls", dir=forward]
  run_driver -- buffer -- enqueue[label="queues", dir=forward, color = red]
}