On 2014/08/26 15:47, Alon Zakai wrote:
> Oh, so in normal non-WebGL GL, there isn't a method to enable an
> extension?
Correct.
> They are all enabled by default?
Yes.
> Then yes, it sounds like we need to add an option to enable an
> extension, emscripten_enable_webgl_ext(const char*) or such. I'm
> surprised we didn't run into this before. I think emscripten might
> already be enabling some extensions by default, that sounds familiar.
>
Yes I think this option is needed.
In native OpenGL {,ES} the tokens are all defined in the .h files so can
be used in code without any additional checks. Function pointers are
also defined. To use an extension that does not add any functions, the
application simply uses it, preferably checking for its existence first.
For extensions that add functions, the app queries the function pointer
values setting those into the existence function pointer variables.
In WebGL a call to getExtension, which is defined as "object?
getExtension(DOMString name", returns an object which contains any
constants or functions defined by the extension. This has to be
reconciled with the native OpenGL way of doing things.
Regards
-Mark
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