Simple SDL window

main.cpp

#include <SDL2/SDL.h>

#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480

SDL_Renderer * renderer = NULL;

int init()
{
      SDL_Window* gWindow = SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
    if( gWindow == NULL )
    {
            printf( "Window could not be created! SDL Error: %s\n", SDL_GetError() );
            return -1;
    }
    else
    {
            //Create vsynced renderer for window
        renderer = SDL_CreateRenderer( gWindow, -1, SDL_RENDERER_ACCELERATED ); // SDL_RENDERER_PRESENTVSYNC deactivated
	SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "0");
	
        if( renderer == NULL )
        {
                printf( "Renderer could not be created! SDL Error: %s\n", SDL_GetError() );
                return -1;
        }
        else
        {
                //Initialize renderer color
                SDL_SetRenderDrawColor( renderer, 255, 0, 0, 255);

		SDL_RendererInfo info;
		SDL_GetRendererInfo( renderer, &info);
		
		printf("Used renderer: %s\n", info.name);
		
        }

    }
}

int main( int argc, char* args[] )
{
  bool quit = false;
  init();
  SDL_Event e;
    //While application is running
    while( !quit )
    {
        //Handle events on queue
        while( SDL_PollEvent( &e ) != 0 )
        {
            //User requests quit
            if( e.type == SDL_QUIT )
            {
                printf("SDL_QUIT received\n");
                quit = true;
            }
	}
	
	SDL_RenderPresent( renderer );
	    //Clear screen
	SDL_SetRenderDrawColor( renderer, 200, 200, 200, 200);
	SDL_RenderClear( renderer );
    }
}