Setting up SDL2 in macOS (Xcode or CMake)

Toggling Fullscreen Mode in SDL2

How can I toggle between windowed and fullscreen modes in my SDL2 application?

Abstract art representing computer programming

SDL2 provides functions to easily switch between windowed and fullscreen modes for your application window. Here's how you can toggle fullscreen mode:

Step 1: Create a flag to keep track of the current window state:

bool isFullscreen = false;

Step 2: When you want to toggle fullscreen mode (e.g., when a specific key is pressed), use the following code:

if (isFullscreen) {
    SDL_SetWindowFullscreen(window, 0);
    isFullscreen = false;
  } else {
    SDL_SetWindowFullscreen(window,
      SDL_WINDOW_FULLSCREEN_DESKTOP);
    isFullscreen = true;
  }

Here's a complete example that demonstrates toggling fullscreen mode when the 'F' key is pressed:

#include <SDL.h>
#include <SDL_image.h>
#include <iostream>

int main(int argc, char** argv) {
  // Initialize SDL2 and create a window
  SDL_Init(SDL_INIT_VIDEO);
  SDL_Window* window = SDL_CreateWindow(
    "Hello Window", 100, 100, 700, 300, 0);
  bool isFullscreen = false;
  bool quit = false;

  while (!quit) {
    SDL_Event event;
    while (SDL_PollEvent(&event)) {
      if (event.type == SDL_QUIT) {
        quit = true;
      } else if (event.type == SDL_KEYDOWN) {
        if (event.key.keysym.sym == SDLK_f) {
          if (isFullscreen) {
            SDL_SetWindowFullscreen(window, 0);
            isFullscreen = false;
          } else {
            SDL_SetWindowFullscreen(window,
              SDL_WINDOW_FULLSCREEN_DESKTOP);
            isFullscreen = true;
          }
        }
      }
    }

    // Render your game content
    // ...
  }

  // Cleanup and exit
  // ...

  return 0;
}

In this example:

  1. We create a flag isFullscreen to keep track of the current window state.
  2. Inside the event loop, we check for the SDL_KEYDOWN event and specifically check if the 'F' key is pressed.
  3. If the 'F' key is pressed, we toggle the fullscreen mode using SDL_SetWindowFullscreen:
    • If isFullscreen is true, we pass 0 to disable fullscreen mode.
    • If isFullscreen is false, we pass SDL_WINDOW_FULLSCREEN_DESKTOP to enable fullscreen mode.
  4. We update the isFullscreen flag accordingly.

By using this approach, you can easily allow users to switch between windowed and fullscreen modes in your SDL2 application, providing a more immersive experience when desired.

This Question is from the Lesson:

Setting up SDL2 in macOS (Xcode or CMake)

This step-by-step guide shows you how to set up SDL2 in an Xcode or CMake project on macOS

Answers to questions are automatically generated and may not have been reviewed.

This Question is from the Lesson:

Setting up SDL2 in macOS (Xcode or CMake)

This step-by-step guide shows you how to set up SDL2 in an Xcode or CMake project on macOS

3D art representing computer programming
Part of the course:

Building Minesweeper with C++ and SDL2

Apply what we learned to build an interactive, portfolio-ready capstone project using C++ and the SDL2 library

Free, unlimited access

This course includes:

  • 37 Lessons
  • 100+ Code Samples
  • 92% Positive Reviews
  • Regularly Updated
  • Help and FAQ
Free, Unlimited Access

Professional C++

Comprehensive course covering advanced concepts, and how to use them on large-scale projects.

Screenshot from Warhammer: Total War
Screenshot from Tomb Raider
Screenshot from Jedi: Fallen Order
Contact|Privacy Policy|Terms of Use
Copyright © 2024 - All Rights Reserved