[Bf-cycles] Apple OpenCL and Cycles

[Przemyslaw Golab]

Nazim, why You want to use OpenCL for CPU it will have no speed gain.


2012/12/17 Nazim Mer <nazim.mer at gmail.com>

> Hi,
> Can you post the directory in which the  device_opencl.cpp file is
> contained in...(is this file the same among st all platforms)
>
> as well as:
> what the final file should look like once changes are made...
>
> OR
> would enabling CPU based Opencl be a target for the official blender build
> " but certainly a good target for the next release."
> i.e. Blender 2.65a....
>
>
> On 17 December 2012 15:35, Ton Roosendaal <ton at blender.org> wrote:
>
>> Hi Marcio,
>>
>> Our OS X platform maintainer - Jens Verwiebe - reported similar good
>> results.
>> It hasn't been taken further yet... but certainly a good target for the
>> next release.
>>
>> Could you upload your compiled blender.app for others to check?
>>
>> -Ton-
>>
>> ------------------------------------------------------------------------
>> Ton Roosendaal  Blender Foundation   ton at blender.org    www.blender.org
>> Blender Institute   Entrepotdok 57A  1018AD Amsterdam   The Netherlands
>>
>> On 17 Dec, 2012, at 13:57, Marcio Andrade wrote:
>>
>> > Hello,
>> >
>> > I read that OpenCL development on Cycles is on hold, mainly because of
>> compiler/driver problems in the AMD SDK. I have been doing some experiments
>> with OpenCL on a Mac, and so far I did not encounter thouse kind of
>> problems. After making some small changes to the kernel (basically enabling
>> some defines that were commented out in kernel_types.h and fixing one
>> compile error), I gave it a try.
>> >
>> > Compilation is fast and does not give memory errors. On my system the
>> kernel is compiled in under 5 seconds. My Mac has a Intel HD 3000 GPU,
>> which does not support OpenCL, so in order to make these tests I enabled
>> OpenCL on the CPU (a small change to device_opencl.cpp). When I run the
>> kernel in Blender, rendering time is close to the normal render using CPU,
>> which is expected, since OpenCL Kernel on CPU should be close to the C++
>> Kernel on CPU.
>> >
>> > Apple is the original author of OpenCL, and OpenCL support on Macs
>> seems to be pretty decent (no need to install anything, it is already
>> bundled). So, is there anyone else trying Cycles/OpenCL on Apple hardware ?
>> I would like to know how OpenCL performs on a Mac with a true GPU, to see
>> if its worth pursuing this direction.
>> >
>> >
>> > Regards,
>> > migueletto
>> >
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>>
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>
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