mobiground/main.c

#include <stdio.h> // for fprintf()
#include <stdlib.h> // for exit()

#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h> // only include this one in the source file with main()!

SDL_Window* window = NULL;
SDL_Renderer* renderer = NULL;

static void panic ( const char *text ) __attribute__((noreturn));

void panic ( const char *text )
{
  fprintf(stderr, "ERROR: %s. %s\n", text, SDL_GetError());
  SDL_DestroyRenderer(renderer);
  SDL_DestroyWindow(window);
  SDL_Quit();
  exit(1);
}

int main( int argc, char* argv[] )
{
    const int WIDTH = 640;
    const int HEIGHT = 480;
    bool loopShouldStop = false;

    if (!SDL_Init(SDL_INIT_VIDEO))
    {
        panic("SDL_Init failed");
    }

    window = SDL_CreateWindow("Hello SDL", WIDTH, HEIGHT, 0);
    if (!window) 
    {
        panic("SDL_CreateWindow");
    }

    renderer = SDL_CreateRenderer(window, "opengl");
    if (!renderer) 
    {
        panic("SDL_CreateRenderer");
    }

    int orange = 0;
    while (!loopShouldStop)
    {
        SDL_Event e;
        SDL_zero(e);
        while (SDL_PollEvent(&e))
        {
            if (e.type == SDL_EVENT_KEY_DOWN && e.key.mod == SDL_KMOD_LCTRL && e.key.key == SDLK_Q)
                loopShouldStop = true;
        }

        SDL_SetRenderDrawColor(renderer, 0, orange, 0, 255);
        SDL_RenderClear(renderer);
        SDL_RenderPresent(renderer);
        orange = (orange + 1) % 256;
    }
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    exit(0);
}