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



This should already be filed here: https://bugs.webkit.org/show_bug.cgi?id=45487

-enne

El día 13 de octubre de 2010 14:37, Kenneth Russell <kbr@google.com> escribió:
> FYI, I've updated sdk/tests/conformance/array-unit-tests.html in the
> WebGL public repository with a test case based on this report,
> currently failing in Chromium and WebKit.
>
> -Ken
>
> On Wed, Oct 13, 2010 at 2:29 PM, Kenneth Russell <kbr@google.com> wrote:
>> 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
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>
>
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