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where is glXGetProcAddressARB?

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i want to load glActiveTextureARB() with glXGetProcAddressARB(char*). but the problem is, that i cant find the function declaration. PFNGLACTIVETEXTUREARBPROC glActiveTextureARB = glXGetProcAddressARB("glActiveTextureARB"); i am using linux, it would be nice if someone knows what to so, to load gl extensions.

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use an automatic extension loader program
IIRC theres a few have a google ( IIRC glew is the name of one )
most I assume will work in linux

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I solve this problem by dlopen()ing libGL.so and then dlsym()ing the extensions I need. Finding libGL is a task unto itself but this tends to be more reliable.

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