Comments for Depósito de ideias - Ideas Warehouse

Comment on Brute Force Exact Euclidian Distance Transform in CUDA by ultraspinnablearticles.Com

ultraspinnablearticles.Com — Tue, 21 May 2013 01:17:33 +0000

I every time spent my half an hour to read this blog’s posts everyday along with a cup of coffee.

Comment on OpenCL on GEGL: Results up to now by Victor Oliveira

Victor Oliveira — Tue, 25 Dec 2012 17:48:41 +0000

“may it be replaced by dynamic kernels loading from files?”

This is something I intend to work on, It’d be better if opencl kernels sources are in separated files and loaded at runtime.

About the API, you can see the brightness-constrast example and others.

Most of the internal code is in:
- gegl/opencl/*
- gegl/buffer/gegl-buffer-cl-iterator.*
- gegl/buffer/gegl-buffer-cl-cache.*
- gegl/operation/gegl-operation-* (*_cl_process functions)

Comment on OpenCL on GEGL: Results up to now by RPG

RPG — Tue, 25 Dec 2012 17:09:57 +0000

It seems that gegl is enough for filters development and testing, no GIMP needed? I’ll try to clone and build.

There is a litle misunderstanding: I asked about your internal guides of OpenCL development, maybe you implemented an API to create kernels or some other. I see that you place all kernels inside *.c source – may it be replaced by dynamic kernels loading from files? About OpenCL itself – it is very similar to GLSL shaders, I hope there will be no problems for me:)

Comment on OpenCL on GEGL: Results up to now by Victor Oliveira

Victor Oliveira — Tue, 25 Dec 2012 16:40:32 +0000

You need to be able to create new GEGL filters, so I think the best would be to build it from source.
About OpenCL development, the OpenCL reference pages are pretty good:
http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/
But I don’t know of any specific tutorial besides just googling it.

You can give a look at some simple GEGL filters:
- http://git.gnome.org/browse/gegl/tree/operations/common/brightness-contrast.c
- http://git.gnome.org/browse/gegl/tree/operations/common/box-blur.c

Next steps of the work are:

- testing and solving bugs in different platforms (the code should be able to recover from errors in _any_ OpenCL call).
- Simplifying the API, for point filters it’s great right now, but for more complicated filters it’s a mess as you can see.
- improve gegl testing system to see if the output for OpenCL and normal code paths are the same.
- implement all abyss policies from GEGL
- OpenCL support for more filters (http://wiki.gimp.org/index.php/Hacking:Porting_filters_to_GEGL)
- identify and solve remaining performance issues.

A GSoC that I’d be happy to mentor can easily be derived from this list

Comment on OpenCL on GEGL: Results up to now by RPG

RPG — Tue, 25 Dec 2012 15:48:51 +0000

Must I get and build new version from git and so on, or I can try in in my GIMP 2.8 distribution?

And is there any guide about OpenCL cernels development? I have some machines with new GPU’s, so I can make some tests and try to make some algorithms on holydays:)

The new GSoC is coming. Do you need some help in development of OpenCL implementations?

Comment on OpenCL on GEGL: Results up to now by Victor Oliveira

Victor Oliveira — Tue, 25 Dec 2012 15:20:38 +0000

Hi RPG!
So, the project has advanced a lot, I’ve basically rewritten a lot of things along the year… You can just set a gaussian blur in GEGL for example and see the difference.

Here is a presentation I gave at LGM at the middle of the year about it:

You can see 20x speedups for example, it’s good
So, the code currently works on any OpenCL implementation, even for CPUs, of course, speedups depend on your GPU. For example, for development I’ve been using an integrated Intel GPU and it works just fine.

I haven’t used the node editor for GEGL yet, but I intend to soon.
Thanks for the interest in the project, I need testers for the OpenCL path in GEGL, so if you can just give a try, that’d be awesome

Victor

Comment on OpenCL on GEGL: Results up to now by RPG

RPG — Sun, 23 Dec 2012 20:58:11 +0000

Hello, Victor!
Very glad to see the project in development. How about performance? Is there any improvements? Can this solution work on old GPUs (not too old to not support CUDA/OpenCL, but relatively different from Tesla)?

I also saw a node editor project, that could be more suitable for OpenCL.

Comment on How to build GIMP 2.7.5 using MinGW in Windows 32-bits by Leet

Leet — Sun, 08 Apr 2012 16:56:02 +0000

Thanks for your reply, I’ll try to rebuild it again later. Do you have a working build of GIMP 2.8RC1 for Windows and would you like to share it?

Comment on How to build GIMP 2.7.5 using MinGW in Windows 32-bits by Victor Oliveira

Victor Oliveira — Sat, 07 Apr 2012 14:56:45 +0000

Sometimes this can happen, try to clean your build and try again.
Some libraries requirements have been updated in GIMP 8RC1, but I don’t remember which ones :/

Comment on How to build GIMP 2.7.5 using MinGW in Windows 32-bits by Leet

Leet — Sat, 07 Apr 2012 14:37:01 +0000

Same issue if I try to compile GIMP 2.7.5, so it seems that my building environment is somehow messed up… :/