Javascript opencl to webcl

[wolfviking0]

HI guys,

i m working on opencl library inside emscripten, i m starting to have some result but i have a very weird problem with parameter

C Part :

    int err;                            // error code returned from api calls
    cl_device_id device_id;             // compute device id
    cl_uint device_num;                    // compute device num
    int gpu = 1;
    err = clGetDeviceIDs(NULL, gpu ? CL_DEVICE_TYPE_GPU : CL_DEVICE_TYPE_CPU , 1, &device_id, &device_num);

Javascript Part

  clGetDeviceIDs: function(platform, device_type, num_entries, devices, num_devices) {
    console.log("platform : "+platform);
    console.log("device_type : "+device_type);
    console.log("num_entries : "+num_entries);
    console.log("devices : "+devices);
    console.log("num_devices : "+num_devices);
 },

If i do that my parameter are wrong, the console says :

[11:07:08,842] platform : 0 -> OK
[11:07:08,842] device_type : 4 -> OK
[11:07:08,842] num_entries : 0 -> WRONG
[11:07:08,842] devices : 1 -> WRONG
[11:07:08,842] num_devices : 8240 -> WRONG

if i change my number of parameter in javascript (i add empty), the console give the good result it's weird !!!!!

Javascript Part

  clGetDeviceIDs: function(platform, device_type, empty, num_entries, devices, num_devices) {
    console.log("platform : "+platform);
    console.log("device_type : "+device_type);
    console.log("num_entries : "+num_entries);
    console.log("devices : "+devices);
    console.log("num_devices : "+num_devices);
 },

[11:03:32,140] platform : 0 -> OK
[11:03:32,140] device_type : 4 -> OK
[11:03:32,140] num_entries : 1 -> OK
[11:03:32,140] devices : 8240 -> OK
[11:03:32,140] num_devices : 8244 -> OK


If somebody have an idea why i have this problem with this function.

Thanks

Tony

[wolfviking0]

Oki, i have more info about my problem,

The parameter who give me a problem is a mask

My function is : 

err = clGetDeviceIDs(0, 1<<3 , 1, &device_id, &device_num);

it's the bitmask who give me this error with javascript parameter.

I must do something wrong but i don't know what ;)

[wolfviking0]

Hi, i still working on webcl, and i have successfully build and execute my hello_world sample In opencl (i use the sample on the Apple website : http://developer.apple.com/library/mac/samplecode/OpenCL_Hello_World_Example/Introduction/Intro.html )

Anyway, i have some trouble with my result. I have some question ...

1) about my problem with parameter, i know is a problem when one of the parameter is bitmask, i can keep working because i had a parameter to my Javascript function but is a dirty way may be a better solution will be great.

2) one of my function in c++ take a référence of pointer, theorically this parameter it´s a refernce for put the list of devices. I want my Javascript put inside the parameter a list of integer, because i keep the devices In a javascript Array. The list will be the position of Device In my Array. How i can do that ???

I m not sure my problem is just that but before debug i need to have a clean code. My error it´s about the result of my kernel opencl. The kernel compute the square of list of 1024 float number. But the result it´s wrong 😳

Thanks for help me with my problems 😌

Tony

[Alon Zakai]

Is one of the parameters an i64 perhaps? Those turn into i32, i32 in function parameters. So corrupted/wrong parameters might be explained by that.

If that's not it, can you make a testcase for us to reproduce the problem with?

- azakai

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[wolfviking0]

Hi Alon,

Yep you have right, the two function who give me a problem take a cl_bitfield
cl_bitfield are cl_ulong,
cl_ulong are typedef unsigned __int64.

When you say convert tha parameter, you talk inside the javascript function  ????

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[Alon Zakai]

Yes. Look at the C code and the generated JS (when it tries to call it). The number of arguments will be different when there is an i64. So you must take that into account when writing the JS side.

- azakai

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[wolfviking0]

Ok I do that, i add one parameter more for that work. But in my case the first parameter has the good result, the second still with zero, for my test i use the first because that work. i must be do something with the two parameters i suppose ??

Tony

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[Alon Zakai]

If the high 32 bits are expected to not be used, I guess you can ignore them. In general cases though they need to be used.

- azakai

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[wolfviking0]

Hi people,

My addons to emscripten for convert OpenCL to WebCL start to working no so bad.

I just share with you some few sample from the http://code.google.com/p/opencl-book-samples/

http://demo.actisku.com/webcl/Chapter_2_HelloWorld.html

http://demo.actisku.com/webcl/Chapter_3_OpenCLInfo.html

http://demo.actisku.com/webcl/Chapter_3_OpenCLConvolution.html

And a little video of WebGL + WebCL ( Not yet fully work ;) ) from http://developer.apple.com/library/mac/#samplecode/OpenCL_RayTraced_Quaternion_Julia-Set_Example:

http://www.youtube.com/watch?v=_Lhg90PwD5k&feature=youtu.be

this sample need firefox 20 and the webcl plugin from http://webcl.nokiaresearch.com/

[oscar barenys]

Are you going to post patches to github?

[wolfviking0]

Hi Oscar,

i hope if everything ok, make a pull request the next week. Still experimental and work just with nokia plugin, i don't try yet the Webkit Samsung version of webcl.

Tony

[oscar barenys]

Thanks good to know..

[wolfviking0]

Hi,

I make an patched version of emscripten here(https://github.com/wolfviking0/webcl-emscripten) for build opencl sample to webcl.
With the last firefox build (21) some sample like (QJulia) doesn't work, it's for that i don't make pull request, but you can play with it if you want.

I try to keep the repository updated with the last incoming version of Emscripten.

Tony