I now tested the same code in chrome. The attribute in question is 
"a_position". It's nothing I'm using in my shaders, but doing a search in 
my project reveals that SDL has some built in shader using it.
Why am I seeing errors from a SDL shader after compiling my own shaders?

maanantai 15. elokuuta 2016 14.48.32 UTC+3 LJA kirjoitti:
>
> I'm using osx and safari. Haven't had time to test other setups. Could 
> ANGLE still be causing this?
>
> sunnuntai 14. elokuuta 2016 22.07.10 UTC+3 キャロウ マーク kirjoitti:
>>
>>
>> On Aug 13, 2016, at 2:28 AM, LJA <[email protected]> wrote:
>>
>> Well the weird part is that I get the warning from the part of code I 
>> showed you:  DLOG("Program Info: %s\n", errorMessage);
>> I get it without making calls to glBindAttributeLocation.
>>
>>
>> The attribute name is coming from WebGL. Which browser and OS are you 
>> using? This is most likely happening when ANGLE rewrites your shader. I 
>> think some browsers have a way to look at the rewritten shader. Doing that 
>> will likely help.
>>
>> Regards
>>
>>     -Mark
>>
>> --
>>
>> <http://www.edgewise-consulting.com> *Mark Callow*
>> President
>> www.edgewise-consulting.com 
>>
>>

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