On Mon, Jul 11, 2016 at 4:02 PM, Param Hanji <param.catchch...@gmail.com>
wrote:
> The other issue is that the number of partitions per pixel is not
>> necessarily the same as the number of segments. IIRC it may be larger. I
>> changed the patch to only copy the first partition per pixel. This may not
>> be sufficient when doing multi-hit rendering.
>>
>> I had an insight on this and wrote a post. Check this out -
>
> https://catchchaos.wordpress.com/2016/07/11/shading/
>
Yeah this might be a problem.
Let me know what you think.
>
>> There may still be issues with the regionbits and solidbits
>> initialization. Or, like you said, with a mismatch between the
>> implementation of the partitions and the segs that are currently used in
>> the OpenCL shading code.
>>
>> I still think this is an important issue and am stumped as to how to get
> around this.
>
We need to check the OpenCL and ANSI C algorithms and compare the traces
for at least a couple of meaningful pixels.
You could compare the pixel datastructures at the places where you now
perform the copies from/to the GPU and similarly for the ANSI C code.
> Also, is your local copy functional. Do you get correct results with
> weaving in OpenCL?
>
Nope. The image looks corrupted. It does not crash anymore (it used to
crash here) but its not working properly yet.
Sorry for the delay, my Nvidia drivers crashed suddenly and I took some
> time to fix and update them.
>
If you get working drivers do not to update them. :-)
NVIDIA sometimes messes up on a revision as they usually test on their most
recent cards but sometimes the older cards stop working. I don't know how
the process works on MacOS X though.
Regards,
--
Vasco Alexandre da Silva Costa
PhD in Computer Engineering (Computer Graphics)
Instituto Superior Técnico/University of Lisbon, Portugal
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