gr-fosphor: n00b run-time errors with benchmark tool and sink block on AMD APU - osmocom-sdr

8 May 2016

Cross-posting an inquiry I sent yesterday to discuss-gnuradio; perhaps
osmocom-sdr may be a more appropriate venue.
---------- Forwarded message ----------
From: "Card, Stu" &lt;stu.card(a)axenterprize.com&gt;
Date: May 7, 2016 4:08 PM
Subject: gr-fosphor: n00b run-time errors with benchmark tool and sink
block on AMD APU
To: &lt;discuss-gnuradio(a)gnu.org&gt;
Cc:

My apologies for this n00b question, but I have not found answers in the
...
  usual places.

 I have carefully followed the instructions at

 http://sdr.osmocom.org/trac/wiki/fosphor

 For building the benchmark tool, I replaced the line

  make LDFLAGS=-L/opt/intel/opencl-1.2-4.5.0.8/lib64

 with

  make LDFLAGS=-L/opt/AMDAPPSDK-3.0/lib/x86_64/sdk

 for my AMD APU (CPU w/on-chip GPU) hardware

 and

 edited the Makefile to remove "-Werror" from the CFLAGS as otherwise the
 warning about cl_create_command_queue being deprecated causes Make to give
 up.

 After thus building the benchmark tool, running main yields

 libEGL warning: DRI2: failed to authenticate
 [+] Selected device: Devastator
 libGL error: No matching fbConfigs or visuals found
 libGL error: failed to load driver: swrast
 X Error of failed request:  BadMatch (invalid parameter attributes)
   Major opcode of failed request:  157 (GLX)
   Minor opcode of failed request:  5 (X_GLXMakeCurrent)
   Serial number of failed request:  30
   Current serial number in output stream:  30C

 Attempting to use the GRC fosphor sink block in a trivial flowgraph (with
 a signal source, noise source and add operation, intended to give me a tone
 with a noise floor), I get no output until I manually terminate it, and
 then in the GRC message pane I see

 libEGL warning: DRI2: failed to find _glapi_get_proc_address
 [+] Selected device: Devastator
 [!] CL Error (-34, /home/stu/gr-fosphor/lib/fosphor/cl.c:464): Unable to
 share waterfall texture into OpenCL context

 The same flowgraph, with the fosphor sink replaced by a QT GUI waterfall
 sink, works as expected.

 Any pointers would be greatly appreciated.

 --
 Stu Card &lt;stu.card(a)axenterprize.com&gt;