switch openGL-loader to GLAD #339
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- normalize source-code while copying it - GLAD/glew compat
on Apple, a GLhandleARB is really (void*), while everywhere else it is (GLuint). this makes it hard to write code that works the same on both platforms (for little gain)
There's virtually no hardware that supports GL_EXT_texture_*, but not openGL-2.0. If there is, then I'm sorry (but don't regret it)
- import sources - build GLAD - start using GLAD-headers (most things fail) - add some separators for ease of code-navigation - properly include glu.h (this was previously handled by glew.h) - replace GLXEW_ with GLAD_GLX_* - streamlined GemContext for glad (and made it more wrangler-agnostic)
it's really not a base-class for objects...
it seems to no longer crash(?)
- fix typo in help-patch - pass "sharedcontext" message to [gemwin] - add some action to the squares
regressions
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this PR drops
glew(whih has deprecated multi-context support a while ago) in favour ofglad(which does support multi-context and is still actively developed)