Enabling VSync with SDL2

To enable VSync in SDL2, you need to set the SDL_RENDERER_PRESENTVSYNC flag when creating your renderer. Here's an example:

1#include <SDL.h>
2
3int main(int argc, char** argv) {
4  SDL_Window* window{SDL_CreateWindow(
5    "VSync Example",
6    SDL_WINDOWPOS_CENTERED,
7    SDL_WINDOWPOS_CENTERED,
8    800, 600, SDL_WINDOW_SHOWN
9  )};
10
11  SDL_Renderer* renderer{SDL_CreateRenderer(
12    window, -1,
13    SDL_RENDERER_ACCELERATED |
14    SDL_RENDERER_PRESENTVSYNC  
15  )};
16
17  // Game loop
18  // ...
19
20  SDL_DestroyRenderer(renderer);
21  SDL_DestroyWindow(window);
22  SDL_Quit();
23
24  return 0;
25}

The SDL_RENDERER_PRESENTVSYNC flag tells SDL to synchronize screen updates with the refresh rate of the monitor. This eliminates screen tearing by ensuring that frames are only updated during the vertical blanking interval.

Keep in mind that enabling VSync will limit your application's frame rate to the refresh rate of the monitor (typically 60 FPS). If your game runs faster than this, you may want to consider using a frame limiter to prevent excessive CPU usage.