Functions.cpp
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Functions.cpp
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	/****************************************************************************
	** Copyright (C) 2011 Luka Horvat <redreaper132 at gmail.com>
	** Copyright (C) 2011 Edward Lii <edward_iii at myway.com>
	** Copyright (C) 2011 O. Bahri Gordebak <gordebak at gmail.com>
	**
	**
	** This file may be used under the terms of the GNU General Public
	** License version 3.0 as published by the Free Software Foundation
	** and appearing in the file LICENSE.GPL included in the packaging of
	** this file.
	**
	** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
	** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	**
	** You should have received a copy of the GNU General Public License
	** along with this program. If not, see <http://www.gnu.org/licenses/>.
	**
	****************************************************************************/

	#include <stdio.h>
	#include <SDL/SDL.h>
	#include <SDL/SDL_mixer.h>
	#include <SDL/SDL_gfxPrimitives.h>
	#include <SDL/SDL_rotozoom.h>
	#include <string>
	#include "Globals.h"
	#include "Functions.h"
	#include "FileManager.h"
	#include "Objects.h"
	#include "Player.h"
	#include "GameObjects.h"
	#include "Levels.h"
	#include "TitleMenu.h"
	#include "LevelEditSelect.h"
	#include "LevelEditor.h"
	#include "Game.h"
	#include "LevelPlaySelect.h"
	#include "Addons.h"
	#include "ImageManager.h"
	#include "MusicManager.h"
	#include "ThemeManager.h"
	#include "GUIListBox.h"

	#ifdef HARDWARE_ACCELERATION
	#include <GL/gl.h>
	#include <GL/glu.h>
	#endif
	using namespace std;

	#ifdef WIN32
	#include <windows.h>
	#include <shlobj.h>
	#else
	#include <strings.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <unistd.h>
	#include <dirent.h>
	#endif

	//Initialise the imagemanager.
	//The ImageManager is used to prevent loading images multiple times.
	ImageManager imageManager;

	//Initialise the musicManager.
	//The MusicManager is used to prevent loading music files multiple times and for playing/fading music.
	MusicManager musicManager;

	//Pointer to the settings object.
	//It is used to load and save the settings file and change the settings.
	Settings* settings=0;

	#ifdef HARDWARE_ACCELERATION
	GLuint screenTexture;
	#endif


	SDL_Surface* loadImage(string file){
	//We use the imageManager to load the file.
	return imageManager.loadImage(file);
	}

	void applySurface(int x,int y,SDL_Surface* source,SDL_Surface* dest,SDL_Rect* clip){
	//The offset is needed to draw at the right location.
	SDL_Rect offset;
	offset.x=x;
	offset.y=y;

	//Let SDL do the drawing of the surface.
	SDL_BlitSurface(source,clip,dest,&offset);
	}

	void drawRect(int x,int y,int w,int h,SDL_Surface* dest,Uint32 color){
	//NOTE: We let SDL_gfx render it.
	rectangleRGBA(dest,x,y,x+w,y+h,color >> 24,color >> 16,color >> 8,255);
	}

	//Draw a box with anti-aliased borders using SDL_gfx.
	void drawGUIBox(int x,int y,int w,int h,SDL_Surface* dest,Uint32 color){
	//Fill content's background color from function parameter
	boxRGBA(screen,x+1,y+1,x+w-2,y+h-2,color >> 24,color >> 16,color >> 8,color >> 0);

	//Draw first black borders around content and leave 1 pixel in every corner
	lineRGBA(screen,x+1,y,x+w-2,y,0,0,0,255);
	lineRGBA(screen,x+1,y+h-1,x+w-2,y+h-1,0,0,0,255);
	lineRGBA(screen,x,y+1,x,y+h-2,0,0,0,255);
	lineRGBA(screen,x+w-1,y+1,x+w-1,y+h-2,0,0,0,255);

	//Fill the corners with transperent color to create anti-aliased borders
	pixelRGBA(screen,x,y,0,0,0,160);
	pixelRGBA(screen,x,y+h-1,0,0,0,160);
	pixelRGBA(screen,x+w-1,y,0,0,0,160);
	pixelRGBA(screen,x+w-1,y+h-1,0,0,0,160);

	//Draw second lighter border around content
	rectangleRGBA(screen,x+1,y+1,x+w-2,y+h-2,0,0,0,64);

	//Create anti-aliasing in corners of second border
	pixelRGBA(screen,x+1,y+1,0,0,0,50);
	pixelRGBA(screen,x+1,y+h-2,0,0,0,50);
	pixelRGBA(screen,x+w-2,y+1,0,0,0,50);
	pixelRGBA(screen,x+w-2,y+h-2,0,0,0,50);
	}

	void drawLine(int x1,int y1,int x2,int y2,SDL_Surface* dest,Uint32 color){
	//NOTE: We let SDL_gfx render it.
	lineRGBA(dest,x1,y1,x2,y2,color >> 24,color >> 16,color >> 8,255);
	}

	void drawLineWithArrow(int x1,int y1,int x2,int y2,SDL_Surface* dest,Uint32 color,int spacing,int offset,int xsize,int ysize){
	//Draw line first
	drawLine(x1,y1,x2,y2,dest,color);

	//calc delta and length
	double dx=x2-x1;
	double dy=y2-y1;
	double length=sqrt(dxdx+dydy);
	if(length<0.001) return;

	//calc the unit vector
	dx/=length; dy/=length;

	//Now draw arrows on it
	for(double p=offset;p<length;p+=spacing){
	drawLine(int(x1+pdx+0.5),int(y1+pdy+0.5),
	int(x1+(p-xsize)dx-ysizedy+0.5),int(y1+(p-xsize)dy+ysizedx+0.5),dest,color);
	drawLine(int(x1+pdx+0.5),int(y1+pdy+0.5),
	int(x1+(p-xsize)dx+ysizedy+0.5),int(y1+(p-xsize)dy-ysizedx+0.5),dest,color);
	}
	}

	bool init(){
	//Initialze SDL.
	if(SDL_Init(SDL_INIT_EVERYTHING)==-1) {
	fprintf(stderr,"FATAL ERROR: SDL_Init failed\n");
	return false;
	}

	//Initialze SDL_mixer (audio).
	if(Mix_OpenAudio(22050,MIX_DEFAULT_FORMAT,2,512)==-1){
	fprintf(stderr,"FATAL ERROR: Mix_OpenAudio failed\n");
	return false;
	}

	//Initialze SDL_ttf (fonts).
	if(TTF_Init()==-1){
	fprintf(stderr,"FATAL ERROR: TTF_Init failed\n");
	return false;
	}

	//Set the screen_width and height.
	SCREEN_WIDTH=atoi(settings->getValue("width").c_str());
	SCREEN_HEIGHT=atoi(settings->getValue("height").c_str());

	//Update the camera.
	camera.w=SCREEN_WIDTH;
	camera.h=SCREEN_HEIGHT;

	//Check if we should use gl or software rendering.
	if(settings->getBoolValue("gl")){
	#ifdef HARDWARE_ACCELERATION
	SDL_GL_SetAttribute(SDL_GL_RED_SIZE,8);
	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE,8);
	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,8);
	SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE,8);

	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,16);
	SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE,32);

	SDL_GL_SetAttribute(SDL_GL_ACCUM_RED_SIZE,8);
	SDL_GL_SetAttribute(SDL_GL_ACCUM_GREEN_SIZE,8);
	SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE,8);
	SDL_GL_SetAttribute(SDL_GL_ACCUM_ALPHA_SIZE,8);

	SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS,0);
	SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES,0);
	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1);

	//Set the video mode.
	Uint32 flags=SDL_HWSURFACE \| SDL_OPENGL;
	if(settings->getBoolValue("fullscreen"))
	flags\|=SDL_FULLSCREEN;
	if(SDL_SetVideoMode(SCREEN_WIDTH,SCREEN_HEIGHT,SCREEN_BPP,flags)==NULL){
	fprintf(stderr,"FATAL ERROR: SDL_SetVideoMode failed\n");
	return false;
	}
	//Create a screen
	screen=SDL_CreateRGBSurface(SDL_HWSURFACE,SCREEN_WIDTH,SCREEN_HEIGHT,32,0x00FF0000,0x0000FF00,0x000000FF,0xFF000000);

	//Create a texture.
	glGenTextures(1,&screenTexture);

	//And set up gl correctly.
	glClearColor(0, 0, 0, 0);
	glClearDepth(1.0f);
	glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0, SCREEN_WIDTH, SCREEN_HEIGHT, 0, 1, -1);
	glMatrixMode(GL_MODELVIEW);
	glEnable(GL_TEXTURE_2D);
	glLoadIdentity();
	#else
	//NOTE: Hardware accelerated rendering requested but compiled without.
	cerr<<"FATAL ERROR: Unable to use hardware acceleration (compiled without)."<<endl;
	return false;
	#endif
	}else{
	Uint32 flags=SDL_HWSURFACE \| SDL_DOUBLEBUF;
	if(settings->getBoolValue("fullscreen"))
	flags\|=SDL_FULLSCREEN;
	screen=SDL_SetVideoMode(SCREEN_WIDTH,SCREEN_HEIGHT,SCREEN_BPP,flags);
	if(screen==NULL){
	fprintf(stderr,"FATAL ERROR: SDL_SetVideoMode failed\n");
	return false;
	}
	}

	//Set the the window caption.
	SDL_WM_SetCaption(("Me and my shadow "+version).c_str(),NULL);
	SDL_EnableUNICODE(1);

	//Create the types of blocks.
	for(int i=0;i<TYPE_MAX;i++){
	Game::blockNameMap[Game::blockName[i]]=i;
	}

	//Nothing went wrong so we return true.
	return true;
	}

	bool loadFiles(){
	//Load the music and play it.
	if(musicManager.loadMusic((getDataPath()+"music/menu.music")).empty()){
	printf("WARNING: Unable to load background music! \n");
	}
	musicManager.playMusic("menu",false);
	//Always load the default music list for fallback.
	musicManager.loadMusicList((getDataPath()+"music/default.list"));

	//Load the fonts.
	fontTitle=TTF_OpenFont((getDataPath()+"font/knewave.ttf").c_str(),55);
	fontGUI=TTF_OpenFont((getDataPath()+"font/knewave.ttf").c_str(),32);
	fontText=TTF_OpenFont((getDataPath()+"font/Blokletters-Viltstift.ttf").c_str(),16);
	if(fontTitle==NULL \|\| fontGUI==NULL \|\| fontText==NULL){
	printf("ERROR: Unable to load fonts! \n");
	return false;
	}

	//Load the menu background.
	menuBackground=loadImage(getDataPath()+"gfx/menu/background.png");
	if(menuBackground==NULL){
	printf("ERROR: Unable to load menu background.\n");
	return false;
	}
	//Check if the menu background needs to be scaled.
	if(menuBackground->w!=SCREEN_WIDTH \|\| menuBackground->h!=SCREEN_HEIGHT){
	menuBackground=zoomSurface(menuBackground,double(SCREEN_WIDTH)/double(menuBackground->w),double(SCREEN_HEIGHT)/double(menuBackground->h),0);
	}

	//Load the default theme.
	if(objThemes.appendThemeFromFile(getDataPath()+"themes/Cloudscape/theme.mnmstheme")==NULL){
	printf("ERROR: Can't load default theme file\n");
	return false;
	}

	//Nothing failed so return true.
	return true;
	}

	bool loadSettings(){
	settings=new Settings(getUserPath(USER_CONFIG)+"meandmyshadow.cfg");
	settings->parseFile();

	//Always return true?
	return true;
	}

	bool saveSettings(){
	settings->save();

	//Always return true?
	return true;
	}

	Settings* getSettings(){
	return settings;
	}

	MusicManager* getMusicManager(){
	return &musicManager;
	}

	void flipScreen(){
	if(settings->getBoolValue("gl")){
	#ifdef HARDWARE_ACCELERATION
	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();

	//Create a texture from the screen surface.
	glBindTexture(GL_TEXTURE_2D,screenTexture);

	//Set the texture's stretching properties
	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

	glTexImage2D(GL_TEXTURE_2D,0,screen->format->BytesPerPixel,screen->w,screen->h,0,GL_BGRA,GL_UNSIGNED_BYTE,screen->pixels);

	glBegin(GL_QUADS);
	glTexCoord2f(0,0); glVertex3f(0,0,0);
	glTexCoord2f(1,0); glVertex3f(SCREEN_WIDTH,0,0);
	glTexCoord2f(1,1); glVertex3f(SCREEN_WIDTH,SCREEN_HEIGHT,0);
	glTexCoord2f(0,1); glVertex3f(0,SCREEN_HEIGHT,0);
	glEnd();

	SDL_GL_SwapBuffers();
	#else
	//NOTE: Trying to flip the screen using gl while compiled without.
	cerr<<"FATAL ERROR: Unable to draw to screen using OpenGL (compiled without)."<<endl;
	#endif
	}else{
	SDL_Flip(screen);
	}
	}

	void clean(){
	//We delete the settings.
	if(settings){
	delete settings;
	settings=NULL;
	}

	//Get rid of the currentstate/
	//NOTE: The state is probably already deleted by the changeState function.
	if(currentState)
	delete currentState;

	//Destroy the GUI if present.
	if(GUIObjectRoot){
	delete GUIObjectRoot;
	GUIObjectRoot=NULL;
	}

	//Destroy the imageManager.
	imageManager.destroy();

	//Destroy the musicManager.
	musicManager.destroy();

	//Close the fonts and quit SDL_ttf.
	TTF_CloseFont(fontTitle);
	TTF_CloseFont(fontGUI);
	TTF_CloseFont(fontText);
	TTF_Quit();

	//Quit SDL.
	SDL_Quit();

	//And finally stop audio.
	Mix_CloseAudio();
	}

	void setNextState(int newstate){
	//Only change the state when we aren't already exiting.
	if(nextState!=STATE_EXIT){
	nextState=newstate;
	}
	}

	void changeState(){
	//Check if there's a nextState.
	if(nextState!=STATE_NULL){
	//Delete the currentState.
	delete currentState;
	currentState=NULL;

	//Set the currentState to the nextState.
	stateID=nextState;
	nextState=STATE_NULL;

	//Init the state.
	switch(stateID){
	case STATE_GAME:
	currentState=new Game();
	break;
	case STATE_MENU:
	levels.clear();
	currentState=new Menu();
	break;
	case STATE_LEVEL_SELECT:
	currentState=new LevelPlaySelect();
	break;
	case STATE_LEVEL_EDIT_SELECT:
	currentState=new LevelEditSelect();
	break;
	case STATE_LEVEL_EDITOR:
	currentState=new LevelEditor();
	break;
	case STATE_OPTIONS:
	currentState=new Options();
	break;
	case STATE_ADDONS:
	currentState=new Addons();
	break;
	}
	//NOTE: STATE_EXIT isn't mentioned, meaning that currentState is null.
	//This way the game loop will break and the program will exit.

	//Fade out.
	int fade=255;
	SDL_BlitSurface(screen,NULL,tempSurface,NULL);
	while(fade>0){
	fade-=17;
	if(fade<0)
	fade=0;


	SDL_FillRect(screen,NULL,0);
	SDL_SetAlpha(tempSurface, SDL_SRCALPHA, fade);
	SDL_BlitSurface(tempSurface,NULL,screen,NULL);
	flipScreen();
	SDL_Delay(25);
	}
	}
	}

	void musicStoppedHook(){
	//We just call the musicStopped method of the MusicManager.
	musicManager.musicStopped();
	}

	bool checkCollision(const SDL_Rect& a,const SDL_Rect& b){
	//Check if the left side of box a isn't past the right side of b.
	if(a.x>=b.x+b.w){
	return false;
	}
	//Check if the right side of box a isn't left of the left side of b.
	if(a.x+a.w<=b.x){
	return false;
	}
	//Check if the top side of box a isn't under the bottom side of b.
	if(a.y>=b.y+b.h){
	return false;
	}
	//Check if the bottom side of box a isn't above the top side of b.
	if(a.y+a.h<=b.y){
	return false;
	}

	//We have collision.
	return true;
	}

	void setCamera(){
	//SetCamera only works in the Level editor.
	if(stateID==STATE_LEVEL_EDITOR){
	//Get the mouse coordinates.
	int x,y;
	SDL_GetMouseState(&x,&y);

	//Make sure we avoid the toolbar.
	SDL_Rect mouse={x,y,0,0};
	SDL_Rect toolbar={155,550,510,50};
	if(checkCollision(mouse,toolbar))
	return;

	//Check if the mouse is near the left edge of the screen.
	//Else check if the mouse is near the right edge.
	if(x<50){
	//We're near the left edge so move the camera.
	camera.x-=5;
	}else if(x>SCREEN_WIDTH-50){
	//We're near the right edge so move the camera.
	camera.x+=5;
	}

	//Check if the mouse is near the top edge of the screen.
	//Else check if the mouse is near the bottom edge.
	if(y<50){
	//We're near the top edge so move the camera.
	camera.y-=5;
	}else if(y>SCREEN_HEIGHT-50){
	//We're near the bottom edge so move the camera.
	camera.y+=5;
	}
	}
	}

	bool parseArguments(int argc, char** argv){
	//Loop through all arguments.
	//We start at one since 0 is the command itself.
	for(int i=1;i<argc;i++){
	string argument=argv[i];

	//Check if the argument is the data-dir.
	if(argument=="--data-dir"){
	//We need a second argument so we increase i.
	i++;
	if(i>=argc){
	printf("ERROR: Missing argument for command '%s'\n\n",argument.c_str());
	return false;
	}

	//Configure the dataPath with the given path.
	dataPath=argv[i];
	if(!getDataPath().empty()){
	char c=dataPath[dataPath.size()-1];
	if(c!='/'&&c!='\\') dataPath+="/";
	}
	}else if(argument=="--user-dir"){
	//We need a second argument so we increase i.
	i++;
	if(i>=argc){
	printf("ERROR: Missing argument for command '%s'\n\n",argument.c_str());
	return false;
	}

	//Configure the userPath with the given path.
	userPath=argv[i];
	if(!userPath.empty()){
	char c=userPath[userPath.size()-1];
	if(c!='/'&&c!='\\') userPath+="/";
	}
	}else if(argument=="-v" \|\| argument=="-version" \|\| argument=="--version"){
	//Print the version.
	printf("Version: '%s'\n\n",version.c_str());
	}else if(argument=="-h" \|\| argument=="-help" \|\| argument=="--help"){
	//If the help is requested we'll return false without printing an error.
	//This way the usage/help text will be printed.
	return false;
	}else{
	//Any other argument is unknow so we return false.
	printf("ERROR: Unknown argument %s\n\n",argument.c_str());
	return false;
	}
	}

	//If everything went well we can return true.
	return true;
	}

	//Special structure that will recieve the GUIEventCallbacks of the messagebox.
	struct msgBoxHandler:public GUIEventCallback{
	public:
	//Integer containing the ret(urn) value of the messageBox.
	int ret;
	public:
	//Constructor.
	msgBoxHandler():ret(0){}

	void GUIEventCallback_OnEvent(std::string name,GUIObject* obj,int eventType){
	//Make sure it's a click event.
	if(eventType==GUIEventClick){
	//Set the return value.
	ret=obj->value;

	//After a click event we can delete the GUI.
	if(GUIObjectRoot){
	delete GUIObjectRoot;
	GUIObjectRoot=NULL;
	}
	}
	}
	};

	msgBoxResult msgBox(string prompt,msgBoxButtons buttons,const string& title){
	//Create the event handler.
	msgBoxHandler objHandler;
	//The GUI objects.
	GUIObject* obj;
	//We keep a pointer to the original GUIObjectRoot for later.
	GUIObject* tmp=GUIObjectRoot;

	//Create the GUIObjectRoot, the height and y location is temp.
	//It depends on the content what it will be.
	GUIObjectRoot=new GUIObject((SCREEN_WIDTH-600)/2,200,600,200,GUIObjectFrame,title.c_str());

	//Integer containing the current y location used to grow dynamic depending on the content.
	int y=50;

	//Now process the prompt.
	{
	//Pointer to the string.
	char* lps=(char*)prompt.c_str();
	//Pointer to a character.
	char* lp=NULL;

	//We keep looping forever.
	//The only way out is with the break statement.
	for(;;){
	//As long as it's still the same sentence we continue.
	//It will stop when there's a newline or end of line.
	for(lp=lps;lp!='\n'&&lp!='\r'&&*lp!=0;lp++);

	//Store the character we stopped on. (End or newline)
	char c=*lp;
	//Set the character in the string to 0, making lps a string containing one sentence.
	*lp=0;

	//Integer used to center the sentence horizontally.
	int x;
	TTF_SizeText(fontText,lps,&x,NULL);
	x=(600-x)/2;

	//Add a GUIObjectLabel with the sentence.
	GUIObjectRoot->childControls.push_back(new GUIObject(x,y,584,25,GUIObjectLabel,lps));
	//Increase y with 25, about the height of the text.
	y+=25;

	//Check the stored character if it was a stop.
	if(c==0){
	//It was so break out of the for loop.
	lps=lp;
	break;
	}
	//It wasn't meaning more will follow.
	//We set lps to point after the "newline" forming a new string.
	lps=lp+1;
	}
	}
	//Add 70 to y to leave some space between the content and the buttons.
	y+=70;
	//Recalc the size of the message box.
	GUIObjectRoot->top=(SCREEN_HEIGHT-y)/2;
	GUIObjectRoot->height=y;

	//Now we need to add the buttons.
	//Integer containing the number of buttons to add.
	int count=0;
	//Array with the return codes for the buttons.
	int value[3]={0};
	//Array containing the captation for the buttons.
	string button[3]={"","",""};
	switch(buttons){
	case MsgBoxOKCancel:
	count=2;
	button[0]="OK";value[0]=MsgBoxOK;
	button[1]="Cancel";value[1]=MsgBoxCancel;
	break;
	case MsgBoxAbortRetryIgnore:
	count=3;
	button[0]="Abort";value[0]=MsgBoxAbort;
	button[1]="Retry";value[1]=MsgBoxRetry;
	button[2]="Ignore";value[2]=MsgBoxIgnore;
	break;
	case MsgBoxYesNoCancel:
	count=3;
	button[0]="Yes";value[0]=MsgBoxYes;
	button[1]="No";value[1]=MsgBoxNo;
	button[2]="Cancel";value[2]=MsgBoxCancel;
	break;
	case MsgBoxYesNo:
	count=2;
	button[0]="Yes";value[0]=MsgBoxYes;
	button[1]="No";value[1]=MsgBoxNo;
	break;
	case MsgBoxRetryCancel:
	count=2;
	button[0]="Retry";value[0]=MsgBoxRetry;
	button[1]="Cancel";value[1]=MsgBoxCancel;
	break;
	default:
	count=1;
	button[0]="OK";value[0]=MsgBoxOK;
	break;
	}

	//Now we start making the buttons.
	{
	//Calculate the x location (centered).
	int x=302-count*50;
	//Reduce y so that the buttons fit inside the frame.
	y-=40;

	//Loop to add the buttons.
	for(int i=0;i<count;i++,x+=100){
	obj=new GUIObject(x,y,96,36,GUIObjectButton,button[i].c_str(),value[i]);
	obj->eventCallback=&objHandler;
	GUIObjectRoot->childControls.push_back(obj);
	}
	}

	//Now we dim the screen and keep the GUI rendering/updating.
	SDL_FillRect(tempSurface,NULL,0);
	SDL_SetAlpha(tempSurface,SDL_SRCALPHA,155);
	SDL_BlitSurface(tempSurface,NULL,screen,NULL);
	while(GUIObjectRoot){
	while(SDL_PollEvent(&event)){
	GUIObjectHandleEvents(true);

	//Also check for the return, escape or backspace button.
	//escape = KEYUP.
	//backspace and return = KEYDOWN.
	if(count==1 && ((event.type==SDL_KEYUP && event.key.keysym.sym==SDLK_ESCAPE) \|\|
	(event.type==SDL_KEYDOWN && (event.key.keysym.sym==SDLK_RETURN \|\| event.key.keysym.sym==SDLK_BACKSPACE)))){
	delete GUIObjectRoot;
	GUIObjectRoot=NULL;
	}

	}
	//Render the gui.
	if(GUIObjectRoot)
	GUIObjectRoot->render();
	flipScreen();
	SDL_Delay(30);
	}

	//We're done so set the original GUIObjectRoot back.
	GUIObjectRoot=tmp;
	//And return the result.
	return (msgBoxResult)objHandler.ret;
	}

	struct fileDialogHandler:public GUIEventCallback{
	public:
	//The ret(urn) value, true=ok and false=cancel
	bool ret;
	//Boolean if it's a save dialog.
	bool isSave;
	//Boolean if the file should be verified.
	bool verifyFile;
	//Boolean if files should be listed instead of directories.
	bool files;

	//Pointer to the textfield containing the filename.
	GUIObject* txtName;
	//Pointer to the listbox containing the different files.
	GUIListBox* lstFile;

	//The extension the files listed should have.
	const char* extension;
	//The current filename.
	string fileName;
	//The current search path.
	string path;

	//Vector containing the search paths.
	vector<string> searchPath;
	public:
	//Constructor.
	fileDialogHandler(bool isSave=false,bool verifyFile=false, bool files=true):ret(false),
	isSave(isSave),verifyFile(verifyFile),
	files(files),txtName(NULL){}

	void GUIEventCallback_OnEvent(std::string name,GUIObject* obj,int eventType){
	//Check for the ok event.
	if(name=="cmdOK"){
	//Get the entered fileName from the text field.
	std::string s=txtName->caption;

	//If it doesn't contain a slash we need to add the path to the fileName.
	if(s.find_first_of("/")==string::npos)
	s=path+s;

	//If the string empty we return.
	if(s.empty() \|\| s.find_first_of("*?")!=string::npos)
	return;

	//We only need to check for extensions if it isn't a folder dialog.
	if(files){
	//If there isn't right extension add it.
	size_t found=s.find_first_of(".");
	if(found!=string::npos)
	s.replace(s.begin()+found+1,s.end(),extension);
	else if (s.substr(found+1)!=extension)
	s.append(string(".")+extension);
	}

	//Check if we should save or load the file.
	//
	if(isSave){
	//Open the file with read permission to check if it already exists.
	FILE* f;
	f=fopen(processFileName(s).c_str(),"rb");

	//Check if it exists.
	if(f){
	//Close the file.
	fclose(f);

	//Let the currentState render once to prevent multiple GUI overlapping and prevent the screen from going black.
	currentState->render();

	//Prompt the user with a Yes or No question.
	if(msgBox(s+" already exists.\nDo you want to overwrite it?",MsgBoxYesNo,"Overwrite Prompt")!=MsgBoxYes){
	//He answered no, so we return.
	return;
	}
	}

	//Check if we should verify the file.
	//Verifying only applies to files not to directories.
	if(verifyFile && files){
	//Open the file with write permission.
	f=fopen(processFileName(s).c_str(),"wb");

	//Check if their aren't problems.
	if(f){
	//Close the file.
	fclose(f);
	}else{
	//Let the currentState render once to prevent multiple GUI overlapping and prevent the screen from going black.
	currentState->render();

	//The file can't be opened so tell the user.
	msgBox("Can't open file "+s+".",MsgBoxOKOnly,"Error");
	return;
	}
	}
	}else if(verifyFile && files){
	//We need to verify a file for opening.
	FILE *f;
	f=fopen(processFileName(s).c_str(),"rb");

	//Check if it didn't fail.
	if(f){
	//Succes, so close the file.
	fclose(f);
	}else{
	//Let the currentState render once to prevent multiple GUI overlapping and prevent the screen from going black.
	currentState->render();

	//Unable to open file so tell the user.
	msgBox("Can't open file "+s+".",MsgBoxOKOnly,"Error");
	return;
	}
	}

	//If we haven't returned then it's fine.
	//Set the fileName to the chosen file.
	fileName=s;

	//Delete the GUI.
	if(GUIObjectRoot){
	delete GUIObjectRoot;
	GUIObjectRoot=NULL;
	}

	//Set return to true.
	ret=true;
	}else if(name=="cmdCancel"){
	//Cancel means we can kill the gui.
	if(GUIObjectRoot){
	delete GUIObjectRoot;
	GUIObjectRoot=NULL;
	}
	}else if(name=="lstFile"){
	//Get a pointer to the listbox.
	GUIListBox* obj1=lstFile;

	//Make sure the option exist and change textfield to it.
	if(obj1!=NULL && txtName!=NULL && obj1->value>=0 && obj1->value<(int)obj1->item.size()){
	txtName->caption=obj1->item[obj1->value];
	}
	}else if(name=="lstSearchIn"){
	//Get the searchpath listbox.
	GUISingleLineListBox obj1=dynamic_cast<GUISingleLineListBox>(obj);

	//Check if the entry exists.
	if(obj1!=NULL && lstFile!=NULL && obj1->value>=0 && obj1->value<(int)searchPath.size()){
	//Temp string.
	string s;

	//Get the new search path.
	path=searchPath[obj1->value];

	//Make sure it isn't empty.
	if(!path.empty()){
	//Process the filename.
	s=processFileName(path);
	}else{
	//It's empty so we give the userpath.
	s=getUserPath();
	}

	//Fill the list with files or directories.
	if(files) {
	lstFile->item=enumAllFiles(s,extension);
	}else
	lstFile->item=enumAllDirs(s);

	//Remove any selection from the list.
	lstFile->value=-1;
	}
	}
	}
	};

	bool fileDialog(string& fileName,const char* title,const char* extension,const char* path,bool isSave,bool verifyFile,bool files){
	//Pointer to GUIObject to make the GUI with.
	GUIObject* obj;
	//Pointer to the current GUIObjectRoot.
	//We keep it so we can put it back after closing the fileDialog.
	GUIObject* tmp=GUIObjectRoot;

	//Create the fileDialogHandler, used for event handling.
	fileDialogHandler objHandler(isSave,verifyFile,files);
	//Vector containing the pathNames.
	vector<string> pathNames;

	//Set the extension of the objHandler.
	objHandler.extension=extension;

	//We now need to splits the given path into multiple path names.
	if(path && path[0]){
	//The string isn't empty.
	//Pointer to the paths string.
	char* lp=(char*)path;
	//Pointer to the first newline.
	char* lps=strchr(lp,'\n');
	//Pointer used for checking if their's another newline.
	//It will indicate if it's the last set or not.
	char* lpe;

	//Check for a newline.
	if(lps){
	//We have newline(s) so loop forever.
	//We can only break out of the loop when the string ends.
	for(;;){
	//Add the first searchpath.
	//This is the beginning of the string (lp) to the first newline. (lps)
	objHandler.searchPath.push_back(string(lp,lps-lp));

	//We should have another newline so search for it.
	lpe=strchr(lps+1,'\n');
	if(lpe){
	//We found it so we add that to the pathname.
	pathNames.push_back(string(lps+1,lpe-lps-1));
	//And start over again by setting lp to the start of a new set of searchPath/pathName.
	lp=lpe+1;
	}else{
	//There is no newline anymore, meaning the last entry, the rest of the string must be the pathName.
	pathNames.push_back(string(lps+1));
	//And break out of the loop.
	break;
	}

	//We haven't broken out so search for a newline.
	lps=strchr(lp,'\n');
	//If there isn't a newline break.
	if(!lps)
	break;
	}
	}else{
	//There is no newline thus the whole string is the searchPath.
	objHandler.searchPath.push_back(path);
	}
	}else{
	//Empty so put an empty string as searchPath.
	objHandler.searchPath.push_back(string());
	}

	//It's time to create the GUI.
	//If there are more than one pathNames we need to add a GUISingleLineListBox.
	int base_y=pathNames.size()>0?60:20;

	//Create the frame.
	GUIObjectRoot=new GUIObject(100,100-base_y/2,600,400+base_y,GUIObjectFrame,title?title:(isSave?"Save File":"Load File"));

	//Create the search path list box if needed.
	if(pathNames.size()>0){
	GUIObjectRoot->childControls.push_back(new GUIObject(8,40,184,36,GUIObjectLabel,"Search In"));
	GUISingleLineListBox* obj1=new GUISingleLineListBox(160,40,432,36);
	obj1->item=pathNames;
	obj1->value=0;
	obj1->name="lstSearchIn";
	obj1->eventCallback=&objHandler;
	GUIObjectRoot->childControls.push_back(obj1);
	}

	//Add the FileName label and textfield.
	GUIObjectRoot->childControls.push_back(new GUIObject(8,20+base_y,184,36,GUIObjectLabel,"File Name"));
	{
	//Fill the textbox with the given fileName.
	string s=fileName;

	if(!isSave){
	//But only if it isn't empty.
	if(s.empty() && extension && extension[0])
	s=string("*.")+string(extension);
	}

	//Create the textbox and add it to the GUI.
	objHandler.txtName=new GUIObject(160,20+base_y,432,36,GUIObjectTextBox,s.c_str());
	GUIObjectRoot->childControls.push_back(objHandler.txtName);
	}

	//Now we add the ListBox containing the files or directories.
	{
	GUIListBox* obj1=new GUIListBox(8,60+base_y,584,292);

	//Get the searchPath.
	string s=objHandler.searchPath[0];
	//Make sure it isn't empty.
	if(!s.empty()){
	objHandler.path=s;
	s=processFileName(s);
	}else{
	s=getUserPath();
	}

	//Check if we should list files or directories.
	if(files){
	//Fill the list with files.
	obj1->item=enumAllFiles(s,extension);
	}else{
	//Fill the list with directories.
	obj1->item=enumAllDirs(s);
	}
	obj1->name="lstFile";
	obj1->eventCallback=&objHandler;
	GUIObjectRoot->childControls.push_back(obj1);
	objHandler.lstFile=obj1;
	}

	//Now create the OK and Cancel buttons.
	obj=new GUIObject(200,360+base_y,192,36,GUIObjectButton,"OK");
	obj->name="cmdOK";
	obj->eventCallback=&objHandler;
	GUIObjectRoot->childControls.push_back(obj);
	obj=new GUIObject(400,360+base_y,192,36,GUIObjectButton,"Cancel");
	obj->name="cmdCancel";
	obj->eventCallback=&objHandler;
	GUIObjectRoot->childControls.push_back(obj);

	//Now we keep rendering and updating the GUI.
	SDL_FillRect(tempSurface,NULL,0);
	SDL_SetAlpha(tempSurface,SDL_SRCALPHA,155);
	SDL_BlitSurface(tempSurface,NULL,screen,NULL);
	while(GUIObjectRoot){
	while(SDL_PollEvent(&event))
	GUIObjectHandleEvents(true);
	if(GUIObjectRoot)
	GUIObjectRoot->render();
	flipScreen();
	SDL_Delay(30);
	}

	//The while loop ended meaning we can restore the previous GUI.
	GUIObjectRoot=tmp;

	//Now determine what the return value is (and if there is one).
	if(objHandler.ret)
	fileName=objHandler.fileName;
	return objHandler.ret;
	}

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