/*  defendguin.c    by Bill Kendrick  bill@newbreedsoftware.com  http://www.newbreedsoftware.com/defendguin/    November 6, 1999 - January 5, 2002*/#define VERSION "0.0.9"#define SLOWDOWN 1/* #define SHOW_FPS */#define STARTING_LEVEL 1/* Includes: */#include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <math.h>#include <SDL.h>#ifndef NOSOUND#include <SDL_mixer.h>#endif /* #ifndef NOSOUND */#ifndef M_PI#define M_PI  3.14159265358979323846  /* mmm... pi... */#endif /* #ifndef M_PI *//* Image enumerations: */enum {  IMG_LOADING,  IMG_LOADING_TEXT,  IMG_PRESS_A_KEY,  IMG_TITLE_TITLE,  IMG_TITLE_ONE_PLAYER,  IMG_TITLE_TWO_PLAYERS,  IMG_TITLE_OPTIONS,  IMG_TITLE_QUIT,  IMG_TITLE_ARROW0,  IMG_TITLE_ARROW1,  IMG_TITLE_ARROW2,  IMG_TITLE_STARFIELD,  IMG_TUX_L0,  IMG_TUX_L1,  IMG_TUX_L2,  IMG_TUX_L3,  IMG_TUX_L4,  IMG_TUX_L5,  IMG_TUX_L6,  IMG_TUX_L7,  IMG_TUX_R0,  IMG_TUX_R1,  IMG_TUX_R2,  IMG_TUX_R3,  IMG_TUX_R4,  IMG_TUX_R5,  IMG_TUX_R6,  IMG_TUX_R7,  IMG_TUX_FALL0,  IMG_TUX_FALL1,  IMG_TUX_LFLAG,  IMG_TUX_RFLAG,  IMG_UFO0,  IMG_UFO1,  IMG_BEAM0,  IMG_BEAM1,  IMG_BEAM2,  IMG_BEAM3,  IMG_MUTANT0,  IMG_MUTANT1,  IMG_POD0,  IMG_POD1,  IMG_POD2,  IMG_SWARMER,  IMG_BOMBER,  IMG_BOMBER_BULGE0,  IMG_BOMBER_BULGE1,  IMG_MINE,  IMG_MINE_FLASH,  IMG_MINE_POP,  IMG_BAITER0,  IMG_BAITER1,  IMG_BAITER2,  IMG_BAITER3,  IMG_BAITER4,  IMG_EVILBILL1,  IMG_EVILBILL2,  IMG_EVILBILL_SHOOT,  IMG_EVILBILL_HURT1,  IMG_EVILBILL_HURT2,  IMG_EVILBILL_FLAME1,  IMG_EVILBILL_FLAME2,  IMG_EVILBILL_FLAME3,  IMG_BULLET0,  IMG_BULLET1,  IMG_BULLET2,  IMG_BULLET3,  IMG_BULLET4,  IMG_LAND_LEFT,  IMG_LAND_CENTER,  IMG_LAND_RIGHT,  IMG_SHIP_LEFT,  IMG_SHIP_RIGHT,  IMG_SHIP_LEFT2,  IMG_SHIP_RIGHT2,  IMG_SHIP_LEFT_DYING,  IMG_SHIP_RIGHT_DYING,  IMG_SHIP_WIN_0,  IMG_SHIP_WIN_1,  IMG_SHIP_WIN_2,  IMG_DISCO_1,  IMG_DISCO_2,  IMG_FLAME_LEFT_0,  IMG_FLAME_LEFT_1,  IMG_FLAME_RIGHT_0,  IMG_FLAME_RIGHT_1,  IMG_LASERS,  IMG_STATUS_AREA,  IMG_MAP_LAND,  IMG_MAP_PENG,  IMG_MAP_ALERT,  IMG_MAP_UFO,  IMG_MAP_MUTANT,  IMG_MAP_BOMBER,  IMG_MAP_MINE,  IMG_MAP_POD,  IMG_MAP_SWARMER,  IMG_MAP_BAITER,  IMG_MAP_EVILBILL,  IMG_MAP_SHIP,  IMG_SHIPS,  IMG_SMART_BOMB,  IMG_GET_READY,  IMG_PENGUINOID_IN_TROUBLE,  IMG_PENGUINOID_MUTATED,  IMG_CATCH_THE_PENGUINOID,  IMG_PENGUINOID_DROPPED,  IMG_PENGUINOID_SAVED,  IMG_PENGUINOID_SHOT,  IMG_PLANET_DESTROYED,  IMG_LEVEL_BONUS,  IMG_NO_BONUS,  IMG_GAME_OVER,  IMG_NUMBERS,  IMG_100,  IMG_150,  IMG_200,  IMG_250,  IMG_1000,  IMG_CIRCLE,  IMG_OPTION_TEXT,  NUM_IMAGES};/* Image filenames: */const char * image_names[NUM_IMAGES] = {  DATA_PREFIX "images/loader/loading.bmp",  DATA_PREFIX "images/loader/loading-text.bmp",  DATA_PREFIX "images/loader/press-a-key.bmp",  DATA_PREFIX "images/title/title.bmp",  DATA_PREFIX "images/title/one-player.bmp",  DATA_PREFIX "images/title/two-players.bmp",  DATA_PREFIX "images/title/options.bmp",  DATA_PREFIX "images/title/quit.bmp",  DATA_PREFIX "images/title/arrow0.bmp",  DATA_PREFIX "images/title/arrow1.bmp",  DATA_PREFIX "images/title/arrow2.bmp",  DATA_PREFIX "images/title/starfield.bmp",  DATA_PREFIX "images/tux/l0.bmp",  DATA_PREFIX "images/tux/l1.bmp",  DATA_PREFIX "images/tux/l2.bmp",  DATA_PREFIX "images/tux/l3.bmp",  DATA_PREFIX "images/tux/l4.bmp",  DATA_PREFIX "images/tux/l5.bmp",  DATA_PREFIX "images/tux/l6.bmp",  DATA_PREFIX "images/tux/l7.bmp",  DATA_PREFIX "images/tux/r0.bmp",  DATA_PREFIX "images/tux/r1.bmp",  DATA_PREFIX "images/tux/r2.bmp",  DATA_PREFIX "images/tux/r3.bmp",  DATA_PREFIX "images/tux/r4.bmp",  DATA_PREFIX "images/tux/r5.bmp",  DATA_PREFIX "images/tux/r6.bmp",  DATA_PREFIX "images/tux/r7.bmp",  DATA_PREFIX "images/tux/fall0.bmp",  DATA_PREFIX "images/tux/fall1.bmp",  DATA_PREFIX "images/tux/lflag.bmp",  DATA_PREFIX "images/tux/rflag.bmp",  DATA_PREFIX "images/ufo/ufo0.bmp",  DATA_PREFIX "images/ufo/ufo1.bmp",  DATA_PREFIX "images/ufo/beam0.bmp",  DATA_PREFIX "images/ufo/beam1.bmp",  DATA_PREFIX "images/ufo/beam2.bmp",  DATA_PREFIX "images/ufo/beam3.bmp",  DATA_PREFIX "images/mutant/mutant0.bmp",  DATA_PREFIX "images/mutant/mutant1.bmp",  DATA_PREFIX "images/pod/pod0.bmp",  DATA_PREFIX "images/pod/pod1.bmp",  DATA_PREFIX "images/pod/pod2.bmp",  DATA_PREFIX "images/swarmer/swarmer.bmp",  DATA_PREFIX "images/bomber/bomber.bmp",  DATA_PREFIX "images/bomber/bomber-bulge0.bmp",  DATA_PREFIX "images/bomber/bomber-bulge1.bmp",  DATA_PREFIX "images/bomber/mine.bmp",  DATA_PREFIX "images/bomber/mine-flash.bmp",  DATA_PREFIX "images/bomber/mine-pop.bmp",  DATA_PREFIX "images/baiter/baiter0.bmp",  DATA_PREFIX "images/baiter/baiter1.bmp",  DATA_PREFIX "images/baiter/baiter2.bmp",  DATA_PREFIX "images/baiter/baiter3.bmp",  DATA_PREFIX "images/baiter/baiter4.bmp",  DATA_PREFIX "images/evilbill/evilbill1.bmp",  DATA_PREFIX "images/evilbill/evilbill2.bmp",  DATA_PREFIX "images/evilbill/evilbill-shoot.bmp",  DATA_PREFIX "images/evilbill/evilbill-hurt1.bmp",  DATA_PREFIX "images/evilbill/evilbill-hurt2.bmp",  DATA_PREFIX "images/evilbill/flame1.bmp",  DATA_PREFIX "images/evilbill/flame2.bmp",  DATA_PREFIX "images/evilbill/flame3.bmp",  DATA_PREFIX "images/bullet/bullet0.bmp",  DATA_PREFIX "images/bullet/bullet1.bmp",  DATA_PREFIX "images/bullet/bullet2.bmp",  DATA_PREFIX "images/bullet/bullet3.bmp",  DATA_PREFIX "images/bullet/bullet4.bmp",  DATA_PREFIX "images/land/left.bmp",  DATA_PREFIX "images/land/center.bmp",  DATA_PREFIX "images/land/right.bmp",  DATA_PREFIX "images/ship/ship-left.bmp",  DATA_PREFIX "images/ship/ship-right.bmp",  DATA_PREFIX "images/ship/ship-left2.bmp",  DATA_PREFIX "images/ship/ship-right2.bmp",  DATA_PREFIX "images/ship/ship-left-dying.bmp",  DATA_PREFIX "images/ship/ship-right-dying.bmp",  DATA_PREFIX "images/ship/ship-win-0.bmp",  DATA_PREFIX "images/ship/ship-win-1.bmp",  DATA_PREFIX "images/ship/ship-win-2.bmp",  DATA_PREFIX "images/ship/disco-1.bmp",  DATA_PREFIX "images/ship/disco-2.bmp",  DATA_PREFIX "images/ship/flame-left-0.bmp",  DATA_PREFIX "images/ship/flame-left-1.bmp",  DATA_PREFIX "images/ship/flame-right-0.bmp",  DATA_PREFIX "images/ship/flame-right-1.bmp",  DATA_PREFIX "images/ship/lasers.bmp",  DATA_PREFIX "images/status/status-area.bmp",  DATA_PREFIX "images/status/map-land.bmp",  DATA_PREFIX "images/status/map-peng.bmp",  DATA_PREFIX "images/status/map-alert.bmp",  DATA_PREFIX "images/status/map-ufo.bmp",  DATA_PREFIX "images/status/map-mutant.bmp",  DATA_PREFIX "images/status/map-bomber.bmp",  DATA_PREFIX "images/status/map-mine.bmp",  DATA_PREFIX "images/status/map-pod.bmp",  DATA_PREFIX "images/status/map-swarmer.bmp",  DATA_PREFIX "images/status/map-baiter.bmp",  DATA_PREFIX "images/status/map-evilbill.bmp",  DATA_PREFIX "images/status/map-ship.bmp",  DATA_PREFIX "images/status/ships.bmp",  DATA_PREFIX "images/status/smart-bomb.bmp",  DATA_PREFIX "images/status/get-ready.bmp",  DATA_PREFIX "images/status/penguinoid-in-trouble.bmp",  DATA_PREFIX "images/status/penguinoid-mutated.bmp",  DATA_PREFIX "images/status/catch-the-penguinoid.bmp",  DATA_PREFIX "images/status/penguinoid-dropped.bmp",  DATA_PREFIX "images/status/penguinoid-saved.bmp",  DATA_PREFIX "images/status/penguinoid-shot.bmp",  DATA_PREFIX "images/status/planet-destroyed.bmp",  DATA_PREFIX "images/status/level-bonus.bmp",  DATA_PREFIX "images/status/no-bonus.bmp",  DATA_PREFIX "images/status/game-over.bmp",  DATA_PREFIX "images/status/numbers.bmp",  DATA_PREFIX "images/points/100.bmp",  DATA_PREFIX "images/points/150.bmp",  DATA_PREFIX "images/points/200.bmp",  DATA_PREFIX "images/points/250.bmp",  DATA_PREFIX "images/points/1000.bmp",  DATA_PREFIX "images/status/circle.bmp",  DATA_PREFIX "images/status/option-text.bmp"};/* Sound enumerations: */enum {  SND_SELECT,  SND_CONFIRM,  SND_IMPATIENCE,  SND_THRUST,  SND_LASER,  SND_SMARTBOMB,  SND_ONEUP,  SND_DIE1,  SND_DIE2,  SND_MATERIALIZE,  SND_PENG_CAPTURE,  SND_PENG_SAVE,  SND_PENG_DROP0,  SND_PENG_DROP1,  SND_PENG_DROP2,  SND_PENG_KILL,  SND_PENG_SPLAT,  SND_PENG_MUTATE,  SND_EXPLODE,  SND_SWARMERS,  SND_BAITER,  SND_BULLET,  SND_EVILBILL_INTRO,  SND_EVILBILL_SUCCESS1,  SND_EVILBILL_SUCCESS2,  SND_EVILBILL_SUCCESS3,  SND_EVILBILL_SHOOT,  SND_EVILBILL_MINE,  SND_EVILBILL_HURT,  SND_EVILBILL_LOW,  SND_EVILBILL_DIE,  SND_PLANET_DEATH,  SND_GAMEOVER0,  SND_GAMEOVER1,  SND_GAMEOVER2,  NUM_SOUNDS};/* Sound filenames: */const char * sound_names[NUM_SOUNDS] = {  DATA_PREFIX "sounds/title/select.wav",  DATA_PREFIX "sounds/title/confirm.wav",  DATA_PREFIX "sounds/title/impatience.wav",  DATA_PREFIX "sounds/ship/thrust.wav",  DATA_PREFIX "sounds/ship/laser.wav",  DATA_PREFIX "sounds/ship/smartbomb.wav",  DATA_PREFIX "sounds/ship/oneup.wav",  DATA_PREFIX "sounds/ship/die1.wav",  DATA_PREFIX "sounds/ship/die2.wav",  DATA_PREFIX "sounds/materialize.wav",  DATA_PREFIX "sounds/peng/capture.wav",  DATA_PREFIX "sounds/peng/save.wav",  DATA_PREFIX "sounds/peng/drop0.wav",  DATA_PREFIX "sounds/peng/drop1.wav",  DATA_PREFIX "sounds/peng/drop2.wav",  DATA_PREFIX "sounds/peng/kill.wav",  DATA_PREFIX "sounds/peng/splat.wav",  DATA_PREFIX "sounds/peng/mutate.wav",  DATA_PREFIX "sounds/explode.wav",  DATA_PREFIX "sounds/swarmers.wav",  DATA_PREFIX "sounds/baiter.wav",  DATA_PREFIX "sounds/bullet.wav",  DATA_PREFIX "sounds/evilbill/intro.wav",  DATA_PREFIX "sounds/evilbill/success1.wav",  DATA_PREFIX "sounds/evilbill/success2.wav",  DATA_PREFIX "sounds/evilbill/success3.wav",  DATA_PREFIX "sounds/evilbill/shoot.wav",  DATA_PREFIX "sounds/evilbill/mine.wav",  DATA_PREFIX "sounds/evilbill/hurt.wav",  DATA_PREFIX "sounds/evilbill/low.wav",  DATA_PREFIX "sounds/evilbill/die.wav",  DATA_PREFIX "sounds/planet_death.wav",  DATA_PREFIX "sounds/gameover/darn.wav",  DATA_PREFIX "sounds/gameover/finish.wav",  DATA_PREFIX "sounds/gameover/lose.wav"};#define MUS_TITLE DATA_PREFIX "music/child.mod"#define MUS_LAST DATA_PREFIX "music/confusio.mod"#define MUS_WIN DATA_PREFIX "music/easytrip.mod"#define NUM_GAME_MUSICS 5const char * game_music_names[NUM_GAME_MUSICS] = {  DATA_PREFIX "music/no!inhi1.mod",  DATA_PREFIX "music/wormhole.mod",  DATA_PREFIX "music/ants.mod",  DATA_PREFIX "music/summerpa.mod",  DATA_PREFIX "music/blowmind.mod"};#define NUM_QUOTES 10const char * quotes[NUM_QUOTES] = {  "ABOUT TO EXPLODE",  "ARE YOU READY",  "JUST PRESS THE RIGHT BUTTON",  "NO   LET ME FINISH",  "DARN  THATS THE END",  "I DONT LIKE TO LOSE",  "WRITTEN IN EMACS",  "I DONT PUT ANY RESTRICTIONS",  "ACHEM",  "#== NEED TO FIX MAP BUG ==#"};/* Ship directions: */enum {  DIR_LEFT,  DIR_RIGHT};/* Penguinoid modes: */enum {  PENG_MODE_WALKING,  PENG_MODE_BEAMING,  PENG_MODE_CAPTURED,  PENG_MODE_FALLING,  PENG_MODE_SAVED};/* Alien types: */enum {  ALIEN_UFO,  ALIEN_MUTANT,  ALIEN_BOMBER,  ALIEN_MINE,  ALIEN_POD,  ALIEN_SWARMER,  ALIEN_BAITER,  ALIEN_EVILBILL};/* Alien modes: */enum {  ALIEN_MODE_BEAM_IN,  ALIEN_MODE_NORMAL,  ALIEN_MODE_HOME_PENG,  ALIEN_MODE_BEAMING_PENG,  ALIEN_MODE_CAPTURED_PENG,  ALIEN_MODE_HOME_SHIP,  ALIEN_MODE_SHOOTING,  ALIEN_MODE_HURTING,  ALIEN_MODE_DYING};/* Title Options: */enum {  TITLE_OPTION_ONE_PLAYER,  TITLE_OPTION_TWO_PLAYERS,  TITLE_OPTION_OPTIONS,  TITLE_OPTION_QUIT,  NUM_TITLE_OPTIONS};/* Title option images: */const int title_option_images[NUM_TITLE_OPTIONS] = {  IMG_TITLE_ONE_PLAYER,  IMG_TITLE_TWO_PLAYERS,  IMG_TITLE_OPTIONS,  IMG_TITLE_QUIT};/* Arbitrary constraints: */#define MAX_ALIENS 32#define MAX_PENGUINOIDS 16#define MAX_BULLETS 64#define MAX_LASERS 16#define MAX_STARS 128#define MAX_STARFIELDS 512#define MAX_EXPLOSION_BITS 2048#define MAX_POINTS 16#define MAX_FLAMES 8#define LASER_SPEED 128#define LAND_WIDTH 70#define LAND_HEIGHT 15#define LAND_MIN_HEIGHT 10#define CHANCE_UFO_HOME_PENG 1000#define CHANCE_UFO_SHOOT_NORMAL 150#define CHANCE_UFO_SHOOT_HOME 20#define CHANCE_MUTANT_SHOOT 100#define CHANCE_SWARMER_SHOOT 100#define CHANCE_BAITER_SHOOT 50#define CHANCE_EVILBILL_SHOOT 20#define CHANCE_EVILBILL_MINE 100/* Joystick defaults: */#ifdef JOY_YES#define JOY_A 0#define JOY_B 1#define JOY_X 0#define JOY_Y 1#endif /* #ifdef JOY_YES *//* Typedefs: */typedef struct alien_type {  int alive, type, mode, timer, shields;  int x, y, xm, ym, xmm, ymm;  int home_peng, beam_height;} alien_type;typedef struct bullet_type {  int alive, timer, owner;  int x, y, xm, ym;} bullet_type;typedef struct penguinoid_type {  int alive, mode, being_homed;  int x, y, xm, ym;} penguinoid_type;typedef struct laser_type {  int alive;  int x1, x2, y;} laser_type;typedef struct star_type {  int x, y;} star_type;typedef struct starfield_type {  int time;  float radius;  int angle;} starfield_type;typedef struct explosion_bit_type {  int alive, time, img;  int x, y, xm, ym;} explosion_bit_type;typedef struct points_type {  int alive, time, img;  int x, y;} points_type;typedef struct flame_type {  int alive, time, x, y, xm;} flame_type;