Elysian Shadows

Code: Select all

/*This source code copyrighted by Lazy Foo' Productions (2004-2008) 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 an 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;
    }

    SDL_Delay( 2000 );

    //Free the surfaces
    SDL_FreeSurface( message );
    SDL_FreeSurface( background );

    //Quit SDL
    SDL_Quit();

    return 0;
}

Code: Select all

#include"SDL/SDL.h"
#include<string>
#include<iostream>

using namespace std;

const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

SDL_Surface * message = NULL;
SDL_Surface * background = NULL;
SDL_Surface * screen = NULL;

SDL_Surface * loadImage(std::string fileName) {
	SDL_Surface * loadedImage = NULL;
	SDL_Surface * optimizedImage = NULL;

	loadedImage = SDL_LoadBMP(fileName.c_str());

	if(loadedImage != NULL){
		optimizedImage = SDL_DisplayFormat(loadedImage);
		SDL_FreeSurface(loadedImage);
	}
	else{
		cout << "fjel i loadbmp" << endl;
	}

	return optimizedImage;
}

void applySurface(int x, int y, SDL_Surface* source, SDL_Surface* destination) {
	SDL_Rect offset;

	offset.x = x;
	offset.y = y;

	cout << "checkpoint4.1" << endl;

	SDL_BlitSurface(source, NULL, destination, &offset);

	cout << "checkpoint4.2" << endl;
}

int main(int argc, char* args[])
{
	cout << "start" << endl;
	if(SDL_Init( SDL_INIT_EVERYTHING ) == -1){
		cout << "fjel i init" << endl;
		return 1;
	}

	cout << "checkpoint1" << endl;

	screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE);
	if(screen = NULL){
		cout << "fjel i setvideomode" << endl;
		return 1;
	}

	cout << "checkpoint2" << endl;

	SDL_WM_SetCaption("Hello world", NULL);

	cout << "checkpoint3" << endl;

	message = loadImage("hello_world.bmp");
	background = loadImage("background.bmp");

	cout << "checkpoint4" << endl;

	applySurface(0, 0, background, screen);
	applySurface(180, 140, message, screen);

	cout << "checkpoint5" << endl;

	if(SDL_Flip(screen) == -1){
		cout << "fjel i flip" << endl;
		return 1;
	}

	cout << "checkpoint6" << endl;

	SDL_Delay(10000);

	cout << "checkpoint7" << endl;

	SDL_FreeSurface(background);
	SDL_FreeSurface(message);

	cout << "checkpoint8" << endl;

    SDL_Quit();

    cout << "Success" << endl;
    return 0;
}

Code: Select all

start
checkpoint1
checkpoint2
checkpoint3
checkpoint4
checkpoint4.1
checkpoint4.2
checkpoint4.1
checkpoint4.2
checkpoint5

Code: Select all

   if(screen = NULL){

Code: Select all

if( NULL == screen )

Code: Select all

if( NULL = screen )

Code: Select all

if( [variable] == NULL )

Code: Select all

if( [variable] != NULL )

Code: Select all

if( !screen ) // ![variable] means [variable] == NULL or [variable] == false or something like that...
     return 1;

Code: Select all

if( screen ) // OMG NO OPERATOR -- means [variable] != NULL or [variable] != false or other stuff like that
     // do stuff