Creating a Fullscreen Window in SDL2

To create a fullscreen window in SDL2, you can use the SDL_WINDOW_FULLSCREEN flag when creating the window. Here's an example of how to create a fullscreen window:

1#include <SDL.h>
2
3int main(int argc, char* argv[]) {
4  SDL_Init(SDL_INIT_VIDEO);
5
6  SDL_Window* window{SDL_CreateWindow(
7    "Fullscreen Window",
8    SDL_WINDOWPOS_UNDEFINED,
9    SDL_WINDOWPOS_UNDEFINED,
10    0, 0, SDL_WINDOW_FULLSCREEN_DESKTOP
11  )};
12
13  // Rendering and event handling code here
14  // ...
15
16  SDL_DestroyWindow(window);
17  SDL_Quit();
18
19  return 0;
20}

In this example, we pass the SDL_WINDOW_FULLSCREEN_DESKTOP flag as the last argument to SDL_CreateWindow. This flag tells SDL2 to create a fullscreen window that covers the entire desktop.

Note that we set the width and height parameters to 0 since the window will automatically cover the entire screen.

If you want to toggle between fullscreen and windowed mode dynamically, you can use the SDL_SetWindowFullscreen function:

1// Toggle fullscreen mode
2if (SDL_GetWindowFlags(window)
3  & SDL_WINDOW_FULLSCREEN_DESKTOP) {
4  // Exit fullscreen
5  SDL_SetWindowFullscreen(window, 0);
6} else {
7  // Enter fullscreen
8  SDL_SetWindowFullscreen(window,
9    SDL_WINDOW_FULLSCREEN_DESKTOP);
10}

This code snippet checks the current window flags using SDL_GetWindowFlags to determine if the window is currently in fullscreen mode. If it is, it exits fullscreen mode by passing 0 to SDL_SetWindowFullscreen. Otherwise, it enters fullscreen mode by passing the SDL_WINDOW_FULLSCREEN_DESKTOP flag.

Remember to handle the necessary events, such as the SDL_KEYDOWN event, to trigger the fullscreen toggle based on user input.