It’s a Windows system function that is used for creating an OpenGL rendering context, and is very cursed since you have to jump around a few hoops before you can actually use it. I barely managed to find the function signature, let alone any information on how does it work.
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I search with duckduckgo and the first results seem reasonable
Here’s a signature and description https://www.khronos.org/opengl/wiki/Creating_an_OpenGL_Context_(WGL)#Create_Context_with_Attributes - khronos is publisher of OpenGL
here’s the function I presume without attributes, so should be helpful to relate and compare https://learn.microsoft.com/en-us/windows/win32/api/wingdi/nf-wingdi-wglcreatecontext
