Links
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How to make the game run when using Nix in WSL2.
the solution was to use the "nixGLIntel" wrapper
nixGLIntel cabal run
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SDL_RenderPresent(). SO question.
SDL's rendering functions operate on a backbuffer; that is, calling a rendering function such as SDL_RenderDrawLine() does not directly put a line on the screen, but rather updates the backbuffer. As such, you compose your entire scene and present the composed backbuffer to the screen as a complete picture.
Therefore, when using SDL's rendering API, one does all drawing intended for the frame, and then calls this function once per frame to present the final drawing to the user.
The backbuffer should be considered invalidated after each present; do not assume that previous contents will exist between frames. You are strongly encouraged to call SDL_RenderClear() to initialize the backbuffer before starting each new frame's drawing, even if you plan to overwrite every pixel.
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In SDL, what is the difference between using a Surfaces and a Renderer?
Essentially, SDL_Surface is a tool for CPU side blit rendering, where as SDL_Renderer takes advantage of hardware acceleration, and performs the rendering on the GPU. SDL_Renderer provides an abstraction over several APIs and even offers a fallback CPU-side implementation if no other implementation suits your platform (unlikely).