Does a renderer created with SDL_CreateSoftwareRenderer() behave any differently than one created with SDL_CreateRenderer() using the SDL_RENDERER_SOFTWARE flag?
They should behave the same.
A software renderer created with SDL_CreateRenderer will automatically target the window its created with while you have specify a SDL_Surface target with SDL_CreateSoftwareRenderer (so if you want to target your window surface, you need to use SDL_GetWindowSurface)
Other than that, they are created the same. SW_CreateRenderer is just a wrapper that gets the window surface and then calls the same function used by SDL_CreateSoftwareRenderer.
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Use OpenGL API directlly.