sdl2 don't change resolution in raspberry pi

Hi everyone,

I tried a Hello example from Lazy Foo tutorial: 01_hello_SDL.cpp

my raspberry is configurated at video 1080p resolution and when this example start the
resolution not swich to 640x480, remained at 1080p 
I tried to change a last flag of SDL_CreateWindow command: SDL_WINDOW_SHOWN with SDL_WINDOW_FULLSCREEN or SDL_WINDOW_FULLSCREEN_DESKTOP but don't work.

but if I use SDL 1.2 Hello example with:
 SDL_Surface* myVideoSurface = SDL_SetVideoMode(SCREEN_WIDTH,SCREEN_HEIGHT,16,SDL_SWSURFACE |SDL_FULLSCREEN);
it's work very well.

Somebody can Help me?
thanks in advice.
Dak.



/*This source code copyrighted by Lazy Foo' Productions (2004-2015)
and may not be redistributed without written permission.*/

//Using SDL and standard IO
#include <SDL.h>
#include <stdio.h>

//Screen dimension constants
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

int main( int argc, char* args[] )
{
	//The window we'll be rendering to
	SDL_Window* window = NULL;
	
	//The surface contained by the window
	SDL_Surface* screenSurface = NULL;

	//Initialize SDL
	if( SDL_Init( SDL_INIT_VIDEO ) < 0 )
	{
		printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() );
	}
	else
	{
		//Create window
		window = SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
		if( window == NULL )
		{
			printf( "Window could not be created! SDL_Error: %s\n", SDL_GetError() );
		}
		else
		{
			//Get window surface
			screenSurface = SDL_GetWindowSurface( window );

			//Fill the surface white
			SDL_FillRect( screenSurface, NULL, SDL_MapRGB( screenSurface->format, 0xFF, 0xFF, 0xFF ) );
			
			//Update the surface
			SDL_UpdateWindowSurface( window );

			//Wait two seconds
			SDL_Delay( 2000 );
		}
	}

	//Destroy window
	SDL_DestroyWindow( window );

	//Quit SDL subsystems
	SDL_Quit();

	return 0;
}

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