#40 Support for OpenGL 3+ core profile

[皇帝陛下]

Right now GLEW on OpenGL 3+ core profile is totally broken, as it still uses glGetString for extensions; this patch fixes that by constructing a simple open adressing hashset with all of the extensions from glGetStringi and uses that hashset for any further lookups.

[Nigel Stewart]

Deferring, for now.

[Joerg]

Any update on this issue? In SuperTuxKart we apparently just had the same problem, and need to include a patched version of glew, which doesn't make linux package maintainers happy.

[Edward Rudd]

I have a reworked version of this patch that supports GLEW_MX and tested on Win+Mac+Linux. However, the issue exists is that in a core context only extensions not in CORE are provided.. Thus things like ARB_vertex_array_object are not in the extension list as they are CORE in OGL 3.0+.. So GLEW doesn't load those functions at all. So, even with this patch you still need to specify glewExperimental = GL_TRUE;

To get those functions loading there are a few options.. All of which require parsing the registry/xml/gl.xml to note what functions and extensions are in glcore.
1) "stuff" the extension hash with the other extensions
2) simply add those extra functions into the GL_VERSION init method.
3) adjust the calling of the ext load functions so that they also check if the GL_VERSION_X_X is specified.

[Edward Rudd]

I've reworked it so core extensions are now properly loaded. it's a mix of 2 & 3. All my changes based on master are here.

https://sourceforge.net/u/urkle/glew/ci/core-gl-context/tree/

Comments are welcome.. I'll be using these changes in an upcoming mac+linux port I'm working on.

[Nigel Stewart]

See also:
https://github.com/nigels-com/glew/pull/24

[Anonymous]

I moved my branch (and rebased it) over to github.. https://github.com/urkle/glew/compare/core-gl-context

[Nigel Stewart]

Fixed in the upcoming GLEW 2.0.0 release. Closing this.
Thanks for the report.