[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Public WebGL] Problem with typed arrays in firefox



It's definitely a bug in Chrome / WebKit. Alan, could you please
create an account on bugs.webkit.org and file it? Component WebGL, and
CC: my email address. Or let me know if you would prefer I do it.

-Ken

On Wed, Oct 13, 2010 at 2:18 PM, Vladimir Vukicevic
<vladimir@mozilla.com> wrote:
>
> That seems correct to me, and Chrome might have the bug -- a 29/30/31-byte ArrayBuffer can't be evenly divided into 4-byte Unit32 segments.  The spec states:
>
>> The given byteOffset must be a multiple of the element size of
>> the specific type, otherwise an exception is raised.
>>
>> If a given byteOffset and length references an area beyond the
>> end of the ArrayBuffer an exception is raised.
>>
>> If length is not explicitly specified, the length of the ArrayBuffer
>> minus the byteOffset must be a multiple of the element size of the
>> specific type, or an exception is raised.
>
> byteOffset is 0 if it isn't specified, so the third clause here applies in both cases.  The 0,4 case succeeds, because an explicit offset and length is given -- the resulting Uint32Array will have length 4, where 4*4=16 is less than 29/30/31 so that will succeed.
>
>    - Vlad
>
> ----- Original Message -----
>> I think this may be a bug - if so I'll file a bug report.
>>
>> With firefox 4.b6 on win 7 x64 I'm seeing the following behavior:
>>
>> function testCase(size) {
>> ab = new ArrayBuffer(size);
>> try {
>> var xyz = new Uint32Array(ab);
>> } catch(err) {
>> debug("!" + err + " no args");
>> }
>> try {
>> var xyz = new Uint32Array(ab, 0);
>> } catch(err) {
>> debug("!" + err + " start");
>> }
>> try {
>> var xyz = new Uint32Array(ab,0,4);
>> } catch(err) {
>> debug("!" + err + " start, offset");
>> }
>>
>> }
>>
>> gives if size is not a multiple of 4. For example:
>> !Error: invalid arguments no args
>> !Error: invalid arguments start
>>
>> testCase(28); // OK
>> testCase(29); // FAILS
>> testCase(30); //FAILS
>> testCase(31); // FAILS
>> testCase(32); //OK
>>
>> This applies to ff b6 win 7 x64. Chrome works fine. I've tried the
>> latest build but it crashes as
>> soon as I open it.
>>
>> Thanks
>>
>> Alan
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> -----------------------------------------------------------
>> You are currently subscribed to public_webgl@khronos.org.
>> To unsubscribe, send an email to majordomo@khronos.org with
>> the following command in the body of your email:
> -----------------------------------------------------------
> You are currently subscribed to public_webgl@khronos.org.
> To unsubscribe, send an email to majordomo@khronos.org with
> the following command in the body of your email:
>
>

-----------------------------------------------------------
You are currently subscribed to public_webgl@khronos.org.
To unsubscribe, send an email to majordomo@khronos.org with
the following command in the body of your email: