[Beignet] LuxRays vs Beignet: next steps

[Zhigang Gong]

> -----Original Message-----
> From:
> beignet-bounces+zhigang.gong=linux.intel.com at lists.freedesktop.org
> [mailto:beignet-bounces+zhigang.gong=linux.intel.com at lists.freedesktop.
> org] On Behalf Of Simon Richter
> Sent: Tuesday, April 23, 2013 6:49 PM
> To: beignet at lists.freedesktop.org
> Subject: [Beignet] LuxRays vs Beignet: next steps
> 
> Hi,
> 
> I'm still trying to get LuxRays to work on Beignet. LuxRays can run in two
> modes, with or without using images on the GPU side as storage.
> 
> With images, the current blockers are:
> 
> 1. get_image_width is not available
> 
> That should be solvable, I think, and this is probably the next thing I'm
> going to be looking at.
[Gong, Zhigang] I will work on it this week.
> 
> 2. sampler_t initialization with flags does not compile
[Gong, Zhigang] I just fixed this one and the patchset is standing for
review, you may have a try with it if you have time.

-- Zhigang.

> 
> This is more difficult. sampler_t is a pointer to an int that lives in a
special
> area, so I wonder how I should go about creating that from the flags
> parameter. Do I allocate a sampler variable there and have sampler_t
> behave as a smart pointer?
> 
> Without images, it is mainly assertions during compilation:
> 
> 3. LOADI does not handle 64 bit integers
> 
> Not sure if that can be easily handled. That will require a rainy weekend
or
> two.
> 
> 4. LOADI does not handle booleans
> 
> As far as I can see, there is no native boolean type, so it would boil
down
> to integers. For select() to work, the value representing "true"
> should at least have the MSB set, but I think it might also make sense to
> create a different internal type that is similar to an integer but has
> different semantics.
> 
> 5. Booleans cannot be used in Phi nodes.
> 
> This appears to be related to the missing LOADI boolean support -- a Phi
> node where a source path has a fixed value will need a preceding LOADI
> -- so I think that is solved when LOADI is fixed.
> 
>    Simon
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