Post your code. Assuming you're using the exact code that the tutorial provides:
Code:
/*This source code copyrighted by Lazy Foo' Productions (2006) and may not be redestributed without written permission.*/
//The headers
#include "SDL/SDL.h"
#include <string>
//The attributes of the screen
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;
//The surfaces that will be used
SDL_Surface *message = NULL;
SDL_Surface *background = NULL;
SDL_Surface *screen = NULL;
SDL_Surface *load_image( std::string filename )
{
//Temporary storage for the image that's loaded
SDL_Surface* loadedImage = NULL;
//The optimized image that will be used
SDL_Surface* optimizedImage = NULL;
//Load the image
loadedImage = SDL_LoadBMP( filename.c_str() );
//If nothing went wrong in loading the image
if( loadedImage != NULL )
{
//Create an optimized image
optimizedImage = SDL_DisplayFormat( loadedImage );
//Free the old image
SDL_FreeSurface( loadedImage );
}
//Return the optimized image
return optimizedImage;
}
void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination )
{
//Make a temporary rectangle to hold the offsets
SDL_Rect offset;
//Give the offsets to the rectangle
offset.x = x;
offset.y = y;
//Blit the surface
SDL_BlitSurface( source, NULL, destination, &offset );
}
int main( int argc, char* args[] )
{
//Initialize all SDL subsystems
if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
{
return 1;
}
//Set up the screen
screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );
//If there was in error in setting up the screen
if( screen == NULL )
{
return 1;
}
//Set the window caption
SDL_WM_SetCaption( "Hello World", NULL );
//Load the images
message = load_image( "hello_world.bmp" );
background = load_image( "background.bmp" );
//Apply the background to the screen
apply_surface( 0, 0, background, screen );
//Apply the message to the screen
apply_surface( 180, 140, message, screen );
//Update the screen
if( SDL_Flip( screen ) == -1 )
{
return 1;
}
//Wait 2 seconds
SDL_Delay( 2000 );
//Free the surfaces
SDL_FreeSurface( message );
SDL_FreeSurface( background );
//Quit SDL
SDL_Quit();
return 0;
}
You must not be compiling it properly if the code above produces a black screen. (Or maybe the images loaded in the code don't exist or something.) You might want to read the part of the tutorial that covers this: http://lazyfooproductions.com/SDL_tu...on01/index.php
