Question

How to use event loop in SDL2 with C

Answer 1

#include <stdio.h>
#include <stdbool.h>
#include <SDL.h>

int main(int argc, char* argv[]) {
    if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
        printf("SDL_Init Error: %s\n", SDL_GetError());
    }

    SDL_Window* window = SDL_CreateWindow("SDL",
        SDL_WINDOWPOS_CENTERED,
        SDL_WINDOWPOS_CENTERED,
        800, 600, SDL_WINDOW_SHOWN);

    bool close = false;
    SDL_Event event;

    // Event loop 
    while (!close) {
        // Check for events
        while (SDL_PollEvent(&event)) {
            switch (event.type) {
                case SDL_WINDOWEVENT_CLOSE: {
                    if (window) {
                        SDL_DestroyWindow(window); 
                        window = NULL;
                    }
                }
                break;
                case SDL_KEYDOWN: {
                    switch (event.key.keysym.sym) {
                        case SDLK_ESCAPE: // Quit the game
                            close = true;
                            break;
                        }
                }
                break;
                case SDL_QUIT: // Quit the game
                    close = 1;
                    break;
            }
        }
    }

    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}

 

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