Marc, The library does not have any code to manage creating a window, creating a valid opengl context, or handle event processing. These are things which are not exactly trivial in nature, especially in a cross platform manner. Typically for simplicity makers of OpenGL demos rely upon things like GLFW (Graphics Library FrameWork) to get a demo working. Other libraries to do the same thing are SDL, GLUT, SFML, or other similar libraries.
The good news is that NanoVG is designed to work independently of those things. The original C implementation has a callback stub to load the appropriate OpenGL functions based on which back end you choose. Fortunately this tool named Glad <https://glad.dav1d.de/> makes it very simple to create a correct Pascal (or other language) file for the various OpenGL versions. This is probably something we ought to consider using in the FCL, so that for example people would know what functions to load for OpenGL ES versus the full version of OpenGL. And finally the LCL and TOpenGLControl provided in the components folder handle all the requirements already, so if you wanted to use a NanoVG port with Lazarus it ought to be as simple as including some NanoVG.pas in your project and putting a few NanoVG drawing function calls into your TForm1.OpenGLControl1Paint method. In this way using hardware accelerated animated vector text and graphics in any desktop project would be very easy. NanoVG even includes functions to draw vector controls such as sliders, check boxes, buttons, and combo boxes.
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