Base code for the Eric Harrison Game Development Project

GameBase.cpp

#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL/SDL_ttf.h"
#include <string>

// set up my drawing window
const int SCREEN_WIDTH   = 1024;
const int SCREEN_HEIGHT  = 768; 
const int SCREEN_BPP     = 32;
const int CONSOLE_WIDTH  = 200;
const int CONSOLE_HEIGHT = 768;
const char *FONT_TTF     = "cour.ttf";

// declare primary SDL surfaces that we'll be using
SDL_Surface *screen     = NULL;
SDL_Surface *background = NULL;
SDL_Surface *console    = NULL;
SDL_Surface *message    = NULL;

// define our event 
SDL_Event event;

// font declaration
TTF_Font *font = NULL;
SDL_Color textColor = { 255, 255, 255 };

// function to load an image (of any type) and return an optimzed SDL_Surface
SDL_Surface *load_image( std::string filename ) {
	// current image
	SDL_Surface* loadedImage = NULL;

	//The optimized image that will be used
	SDL_Surface* optimizedImage = NULL;

	//Load the image
	loadedImage = IMG_Load( filename.c_str() );
	if( loadedImage != NULL ) {
		optimizedImage = SDL_DisplayFormat( loadedImage );
		// free up our resource
		SDL_FreeSurface( loadedImage );
	}

	return optimizedImage;
}

void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination ) {
	// offset is a temporary rect to hold the coordinates
	SDL_Rect offset;

	offset.x = x;
	offset.y = y;
	
	SDL_BlitSurface( source, NULL, destination, &offset );
}

bool init() {
	if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 ) {
		return 1;
	}

	// prepare our screen
	screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE);

	if( screen == NULL ) {
		printf("The screen could not initialize. Exiting.\n");
		return false;
	}

	if ( TTF_Init() == -1 ) {
		printf("The TTF could not initialize. Exiting.\n");
		return false;
	}

	// titlebar set
	SDL_WM_SetCaption("The Game Project", NULL);

	// all is well...
	return true;
}

bool load_backgrounds() {
	background = load_image("stars.jpg");
	if( background == NULL ) {
		return false;
	}

	console = load_image("console.png");
	if ( console == NULL ) {
		return false;
	}

	font = TTF_OpenFont(FONT_TTF, 20);

	return true;
}

void debug(int x, int y) {
	char cstr[50];
	sprintf(cstr, "x:%i,y:%i", x,y);
	message = TTF_RenderText_Solid(font, cstr, textColor);
	apply_surface(SCREEN_WIDTH - CONSOLE_WIDTH, 0, console, screen);
	apply_surface(SCREEN_WIDTH - CONSOLE_WIDTH + 10, 10, message,screen);
}

void clean_up() {
	SDL_FreeSurface(background);
	SDL_FreeSurface(console);
	SDL_FreeSurface(message);

	TTF_CloseFont(font);
	TTF_Quit();

	SDL_Quit();
}

int main( int argc, char* args[] ) {
	bool quit = false;

	int y = 0;
	int x = 0;

	if( init() == false ) {
		return 1;
	}

	if( load_backgrounds() == false ) {
		return 1;
	}

	// apply our background
	apply_surface(0, 0, background, screen);
	
	if( SDL_Flip(screen) == -1 ) {
		return 1;
	}

	// main loop -- continue until SDL_QUIT is recieved
	while(quit == false) {
		while( SDL_PollEvent(&event) ) {
			switch(event.type) {
				case SDL_MOUSEMOTION:
					x = event.motion.x;
					y = event.motion.y;
					debug(x,y);
					SDL_Flip(screen);
					break;
				case SDL_QUIT:
					printf("Exit!\n");
					quit = true;
					break;
				default:
					// do nothing
					break;
			}
		}
	}

	// make sure we release our resources and exit SDL
	clean_up();

	return 0;
}