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wglGetProcAddress returns NULL


wglGetProcAddress returns NULL

By : WONDERHEIM
Date : November 21 2020, 04:03 PM
I wish did fix the issue. wglGetProcAddress requires an OpenGL rendering context; you need to call your wglCreateContext and wglMakeCurrent prior to calling wglGetProcAddress. If you have not already setup an OpenGL context, wglGetProcAddress will always return NULL. If you're not sure if you have an OpenGL context yet (for example, if you're using a 3rd party framework/library), call wglGetCurrentContext and check to make sure it's not returning NULL.
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wglGetProcAddress for OpenGL 1.1 functions

wglGetProcAddress for OpenGL 1.1 functions


By : user3387474
Date : March 29 2020, 07:55 AM
Hope that helps I technically answered this on the discussion page of that Wiki article, but:
performance of wglGetProcAddress, should calls be cached?

performance of wglGetProcAddress, should calls be cached?


By : Satish
Date : March 29 2020, 07:55 AM
it fixes the issue wglGetProcAddress will at least do some string comparisons so it's not free. The big issue is that your code will be ugly if you insert wglGetProcAddress every time you use a gl function.
It's best if you use a generator that puts all the ugly wglGetProcAddress in a separate file. For example using glux or glloadgen.
wglGetProcAddress returning NULL

wglGetProcAddress returning NULL


By : Turki Hichem
Date : March 29 2020, 07:55 AM
Hope that helps glGetStringi was introduced much later than 1.0 - I believe it is 3.3. To make things worse, on core 3.3+ profile you can't use glGetString(GL_EXTENSIONS), but required to use glGetStringi, which is unavailable for lower profile versions.
MSDN documentation says wglGetProcAddress only returns addresses for extension functions. And 'extension' in their terms is everything that is not in GL 1.1.
wglGetProcAddress is undefined

wglGetProcAddress is undefined


By : user3201000
Date : March 29 2020, 07:55 AM
Hope that helps This is not a linker error, this is a compiler error - so the libraries you link do not matter at this stage at all.
Your compiler is telling you that it doesn't know wglGetProcAddress, because it never saw a declaration for this. Your compiler should also not know GENBUFFERS, as this type is not defined anywhere either. In the official glext.h file, the type you are looking for is called PFNGLGENBUFFERS.
Why does null||null return a null value but concat(null,null) returns an empty string in postgres?

Why does null||null return a null value but concat(null,null) returns an empty string in postgres?


By : Rima
Date : March 29 2020, 07:55 AM
hop of those help? I'm trying to understand the differences between concat() and || in postgres when using nulls. Why does concat() return an empty string if both sides of the concat are null? , in concat() function:
code :
text concat(str "any",...)  Concatenate all arguments. NULL arguments are ignored.
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