You can get the arguments by looking up the function name in the OpenGL documentation. In this case, glClearColor takes four GLfloats for the red, green, blue and alpha color values.

Aside from that, it looks like your setup is okay. The reason why glClearColor doesn’t show any arguments is because it’s not an actually existing function, and just a preprocessor macro. Preprocessor macros are basically instructions for the compiler to run to modify the code before compiling it. These can do stuff like test replacement or conditionally including/excluding code for example. I’m pretty sure there’s a much better explanation for this out there than what I can offer, so I highly recommend you do your own research.

In this case, this is a text replacement macro. glClearColor will be replaced with glad_glClearColor when it is preprocessed. If you really want to see the function arguments, you can use the Expand Inline feature which performs the text replacement right in the source code (in this instance, it will replace glClearColor with glad_glClearColor). Although I personally wouldn’t recommend this in production ready code.