[Bug 82717] New: OpenCL support for mandelbulber-opencl

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sat Aug 16 17:56:08 PDT 2014


          Priority: medium
            Bug ID: 82717
          Assignee: dri-devel at lists.freedesktop.org
           Summary: OpenCL support for mandelbulber-opencl
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: haagch at frickel.club
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

Website of the program here: https://sites.google.com/site/mandelbulber/ (Watch
out, it uses a weird install script)

Start it, go to the OpenCL tab and try to enable OpenCL.

A few things that probably need to be addressed. I applied some workarounds to
see them all and I don't even know if the OpenCL programs would work after
removing all of that stuff.

Problem 1:
OpenCL Build log:
ERROR: Program::build() (-43)

That's because of the build paramater -cl-denorms-are-zero that is hardcoded in
the source code of mandelbulber.

Workarodund 1:
sed -i 's/-cl-denorms-are-zero / /g' src/cl_support.cpp

Problem 2:
OpenCL Build log:       input.cl:34:1: error: OpenCL does not support the
'static' storage class specifier

So that's not valid in OpenCL 1.1, but for the sake of getting it to "just
compile" at least:

Workaround 2:
for i in /usr/share/mandelbulber/cl/*; do sed -i "s/static //g" $i; done

Problem 3:
OpenCL Build log:       input.cl:323:10: error: cannot combine with previous
'type-name' declaration specifier
input.cl:323:15: error: expected identifier or '('
input.cl:324:8: error: expected identifier or '('
input.cl:325:32: error: expected expression

(WTF is random binary data doing here?)

That's a weird one that seems to come from whatever clang does. I think clang
thinks that "half" is already defined in the OpenCL kernels. Not sure if this
is intended.

Workaround 3:
for i in /usr/share/mandelbulber/cl/*; do sed -i "s/half /halfFOO /g" $i; done
for i in /usr/share/mandelbulber/cl/*; do sed -i "s/half)/halfFOO)/g" $i; done

Problem 4:
OpenCL Build log:       �}�
OpenCL program built done
OpenCL kernel opened
OpenCL workgroup size: 256
OpenCL Job size: 480256
terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc

I don't think the crash itself is the fault of mesa opencl, because the
backtrace looks like this:

#0  0x00007fd1154e2d67 in raise () from /usr/lib/libc.so.6
#1  0x00007fd1154e4118 in abort () from /usr/lib/libc.so.6
#2  0x00007fd115dd81f5 in __gnu_cxx::__verbose_terminate_handler() () from
#3  0x00007fd115dd6076 in ?? () from /usr/lib/libstdc++.so.6
#4  0x00007fd115dd60c1 in std::terminate() () from /usr/lib/libstdc++.so.6
#5  0x00007fd115dd62d8 in __cxa_throw () from /usr/lib/libstdc++.so.6
#6  0x00007fd115dd6869 in operator new(unsigned long) () from
#7  0x00007fd115dd68c9 in operator new[](unsigned long) () from
#8  0x00000000004a3683 in CclSupport::InitFractal (this=0x207e200) at
#9  0x000000000042cffb in ChangedOpenClEnabled (widget=0x22bdd60, data=0x0) at
#10 0x00007fd11673b3d8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#11 0x00007fd11674cd5d in ?? () from /usr/lib/libgobject-2.0.so.0

But why is there random binary data in the OpenCL build log?

llvm-svn 215809
libclc-git 165.20140816
opencl-headers12 1:1.2.r26859 (not sure if relevant)
mesa git from today

radeon 7970M pitcairn

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