Dear friends,
I am trying to learn SDL2, and I when I try to execute the eg program given in Lazy Foo
I was not able to initiliaze SDL_Image and hence run the program. Please help me with this.
The code is given below.
Thanking,
Jose Mathew
/This source code copyrighted by Lazy Foo’ Productions (2004-2015)
and may not be redistributed without written permission./
//Using SDL, SDL_image, standard IO, and strings
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <stdio.h>
#include
//Screen dimension constants
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
//Starts up SDL and creates window
bool init();
//Loads media
bool loadMedia();
//Frees media and shuts down SDL
void close();
//Loads individual image
SDL_Surface* loadSurface( std::string path );
//The window we’ll be rendering to
SDL_Window* gWindow = NULL;
//The surface contained by the window
SDL_Surface* gScreenSurface = NULL;
//Current displayed PNG image
SDL_Surface* gPNGSurface = NULL;
bool init()
{
//Initialization flag
bool success = true;
//Initialize SDL
if( SDL_Init( SDL_INIT_VIDEO ) < 0 )
{
printf( "SDL could not initialize! SDL Error: %s\n", SDL_GetError() );
success = false;
}
else
{
//Create 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() );
success = false;
}
else
{
//Initialize PNG loading
int imgFlags = IMG_INIT_PNG;
if( !( IMG_Init( imgFlags ) & imgFlags ) )
{
printf( "SDL_image could not initialize! SDL_image Error: %s\n", IMG_GetError() );
success = false;
}
else
{
//Get window surface
gScreenSurface = SDL_GetWindowSurface( gWindow );
}
}
}
return success;
}
bool loadMedia()
{
//Loading success flag
bool success = true;
//Load PNG surface
gPNGSurface = loadSurface( "loaded.png" );
if( gPNGSurface == NULL )
{
printf( "Failed to load PNG image!\n" );
success = false;
}
return success;
}
void close()
{
//Free loaded image
SDL_FreeSurface( gPNGSurface );
gPNGSurface = NULL;
//Destroy window
SDL_DestroyWindow( gWindow );
gWindow = NULL;
//Quit SDL subsystems
IMG_Quit();
SDL_Quit();
}
SDL_Surface* loadSurface( std::string path )
{
//The final optimized image
SDL_Surface* optimizedSurface = NULL;
//Load image at specified path
SDL_Surface* loadedSurface = IMG_Load( path.c_str() );
if( loadedSurface == NULL )
{
printf( "Unable to load image %s! SDL_image Error: %s\n", path.c_str(), IMG_GetError() );
}
else
{
//Convert surface to screen format
optimizedSurface = SDL_ConvertSurface( loadedSurface, gScreenSurface->format, NULL );
if( optimizedSurface == NULL )
{
printf( "Unable to optimize image %s! SDL Error: %s\n", path.c_str(), SDL_GetError() );
}
//Get rid of old loaded surface
SDL_FreeSurface( loadedSurface );
}
return optimizedSurface;
}
int main( int argc, char* args[] )
{
//Start up SDL and create window
if( !init() )
{
printf( “Failed to initialize!\n” );
}
else
{
//Load media
if( !loadMedia() )
{
printf( “Failed to load media!\n” );
}
else
{
//Main loop flag
bool quit = false;
//Event handler
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 )
{
quit = true;
}
}
//Apply the PNG image
SDL_BlitSurface( gPNGSurface, NULL, gScreenSurface, NULL );
//Update the surface
SDL_UpdateWindowSurface( gWindow );
}
}
}
//Free resources and close SDL
close();
return 0;
}