/* tumult.c Tumult - Destroy enemies down tubes before they reach you. by Bill Kendrick bill@newbreedsoftware.com http://www.newbreedsoftware.com/bill/ September 15, 2001 - October 22, 2001 */ #include #include #include #include #include #include #ifndef NOSOUND #include #endif /* Constants: */ #ifndef M_PI #define M_PI 3.14159 #endif enum { FALSE, TRUE }; #define LEFT_EDGE 0x0001 #define RIGHT_EDGE 0x0002 #define TOP_EDGE 0x0004 #define BOTTOM_EDGE 0x0008 enum { CMD_PLAY, CMD_QUIT, NUM_CMDS }; #define FPS 30 #define WIDTH 400 #define HEIGHT 400 #define X_WIDTH 200 #define Y_HEIGHT 200 #define Z_DEPTH 400 #define DISTANCE 250 #define ASPECT 80 #define ALLEY_LENGTH 200 #define CRAB_RES 24 #define MAX_STARS 100 #define MAX_EXPLOSION_BITS 100 #define MAX_BULLETS 5 #define MAX_ENEMIES 36 /* Types: */ typedef struct color_type { Uint8 r; Uint8 g; Uint8 b; } color_type; typedef struct alley_type { int x, y; } alley_type; typedef struct star_type { int x, y, z; color_type color; } star_type; typedef struct enemy_type { int alive, type; int alley, z; } enemy_type; typedef struct bullet_type { int alive; int alley, z; } bullet_type; typedef struct explosion_bit_type { int alive, time; int x, y, z; int xm, ym, zm; } explosion_bit_type; /* Flying text: */ enum { IMG_MASTERFUL, IMG_1UP, IMG_AUTHOR, IMG_TUMULT, IMG_CREDITS, IMG_PAUSED, IMG_SELECT, IMG_DIGITALDEATH, IMG_RECHARGE, NUM_IMAGES }; char * image_filenames[NUM_IMAGES] = { DATA_PREFIX "images/masterful.png", DATA_PREFIX "images/1up.png", DATA_PREFIX "images/author.png", DATA_PREFIX "images/tumult.png", DATA_PREFIX "images/credits.png", DATA_PREFIX "images/paused.png", DATA_PREFIX "images/select.png", DATA_PREFIX "images/digitaldeath.png", DATA_PREFIX "images/recharge.png" }; /* Sounds: */ enum { SND_BLEEP, SND_BUZZ, SND_DONK, SND_LASER, SND_POOF, SND_POW, SND_TWANG, SND_THRUST_LOW, SND_THRUST_MEDIUM, SND_THRUST_HIGH, NUM_SOUNDS }; char * sound_filenames[NUM_SOUNDS] = { DATA_PREFIX "sounds/bleep.wav", /* Movement */ DATA_PREFIX "sounds/buzz.wav", /* Mega-zapper */ DATA_PREFIX "sounds/donk.wav", DATA_PREFIX "sounds/laser.wav", /* Shooting */ DATA_PREFIX "sounds/poof.wav", /* Explosion */ DATA_PREFIX "sounds/pow.wav", DATA_PREFIX "sounds/twang.wav", DATA_PREFIX "sounds/thrust-low.wav", /* Warp */ DATA_PREFIX "sounds/thrust-medium.wav", /* '' */ DATA_PREFIX "sounds/thrust-high.wav" /* '' */ }; /* Music: (songs) */ enum { MUS_TITLE, MUS_SELECT, MUS_HIGHSCORE, MUS_OTHER, MUS_GAME1, MUS_GAME2, MUS_GAME3, MUS_GAME4, NUM_MUSICS }; char * music_filenames[NUM_MUSICS] = { DATA_PREFIX "music/getzznew.mod", DATA_PREFIX "music/diplomatic-intro.mod", DATA_PREFIX "music/quarter.mod", DATA_PREFIX "music/4est_fulla3s.mod", DATA_PREFIX "music/brainscan.mod", DATA_PREFIX "music/economy16.mod", DATA_PREFIX "music/magic.mod", DATA_PREFIX "music/byte_me.mod" }; /* Global variables: */ SDL_Surface * screen; SDL_Surface * images[NUM_IMAGES]; #ifndef NOSOUND Mix_Chunk * sounds[NUM_SOUNDS]; Mix_Music * musics[NUM_MUSICS]; #endif int use_sound; float anglex, angley; float cos_anglex, sin_anglex, cos_angley, sin_angley; float cos_table[3600], sin_table[3600]; star_type stars[MAX_STARS]; bullet_type bullets[MAX_BULLETS]; enemy_type enemies[MAX_ENEMIES]; explosion_bit_type explosion_bits[MAX_EXPLOSION_BITS]; int level, max_level, alley_loops, num_alleys; alley_type alley[36]; /* Local prototypes: */ void setshape(void); int game(void); void keep_playing_music(void); int pause_screen(void); int title(void); int level_select(void); void drawline3d(float x1, float y1, float z1, color_type c1, float x2, float y2, float z2, color_type c2); void drawline3d_blur(float x1, float y1, float z1, color_type c1, color_type c1b, float x2, float y2, float z2, color_type c2, color_type c2b); void drawpoint3d(float x, float y, float z, color_type c, int thick); int calc3d(int * sx, int * sy, float x, float y, float z); Uint32 getpixel(SDL_Surface * surface, int x, int y); void putpixel(SDL_Surface * surface, int x, int y, Uint32 pixel); void recalctrig(void); unsigned char encode(float x, float y); int clip(int * x1, int * y1, int * x2, int * y2); void drawline(int x1, int y1, color_type c1, int x2, int y2, color_type c2); void drawvertline(int x, int y1, color_type c1, int y2, color_type c2); color_type mkcolor(int r, int g, int b); void setup(int argc, char * argv[]); void seticon(void); int sgn(int x); void init_cos_table(void); float my_cos(float ang); float my_sin(float ang); void set_rand_star(int i, int far); void add_bullet(int alley); void playsound(int chan, int snd); void draw_zap(int alley1, int z1, int alley2, int z2); void draw_lightning(int x1, int y1, int z1, int x2, int y2, int z2); void add_explosion(int al1, int z); void add_explosion_bit(int x, int y, int z); /* MAIN LOOP: */ int main(int argc, char * argv[]) { int cmd, done; /* Set-up */ setup(argc, argv); /* Main program loop: */ done = FALSE; do { cmd = title(); if (cmd == CMD_PLAY) done = game(); } while (cmd != CMD_QUIT && !done); /* Close up and quit: */ SDL_Quit(); return(0); } /* Level selection screen: */ int level_select(void) { int done, quit, x, y, xx, yy, xoff, exiting, i, j, burn; Uint8 r, g, b; Uint32 nr, ng, nb; Uint32 last_time, now_time, frame; SDLKey key; SDL_Rect dest; SDL_Event event; level = 0; setshape(); SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 0, 0, 0)); done = FALSE; quit = FALSE; frame = 0; exiting = 0; burn = 0; for (i = 0; i < MAX_STARS; i++) { stars[i].x = rand() % WIDTH; stars[i].y = ((rand() % (HEIGHT - (images[IMG_SELECT]->h + 10))) + (images[IMG_SELECT]->h + 10)); stars[i].z = (rand() % 10); stars[i].color = mkcolor(255 - ((11 - stars[i].z) * 3), 255 - ((11 - stars[i].z) * 3), 255 - ((11 - stars[i].z) * 3)); } angley = 0; recalctrig(); do { frame++; last_time = SDL_GetTicks(); while (SDL_PollEvent(&event) > 0) { if (event.type == SDL_QUIT) { done = TRUE; quit = TRUE; } else if (event.type == SDL_KEYDOWN) { key = event.key.keysym.sym; if (key == SDLK_RETURN) { exiting = images[IMG_SELECT]->h / 2; } else if (key == SDLK_ESCAPE) { done = TRUE; } else if (key == SDLK_LEFT && exiting == 0) { if (level > 0) { level--; setshape(); playsound(0, SND_LASER); burn = 3; } } else if (key == SDLK_RIGHT && exiting == 0) { if (level < max_level) { level++; setshape(); playsound(0, SND_LASER); burn = 3; } } } } /* Lock surface: */ if (SDL_MUSTLOCK(screen)) SDL_LockSurface(screen); for (y = 1; y < images[IMG_SELECT]->h + 10; y++) { xoff = (rand() % 3) - 1; for (x = 0; x < WIDTH; x++) { nr = 0; ng = 0; nb = 0; for (yy = 0; yy <= 1; yy++) { for (xx = xoff - 1; xx <= xoff + 1; xx++) { SDL_GetRGB(getpixel(screen, x + xx, y + yy), screen->format, &r, &g, &b); nr += (r + ((g + b) / 6)); ng += g; nb += b; } } nr = nr / (7 - burn); ng = ng / (8 - burn); nb = nb / (10 - burn); if (nr >= 0xFF) nr = 0xFF; putpixel(screen, x, y - 1, SDL_MapRGB(screen->format, (Uint8) nr, (Uint8) ng, (Uint8) nb)); } } if (burn > 0) burn--; /* Unlock temp. surface: */ if (SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen); /* Draw "Select" text: */ if (!exiting) { dest.x = (WIDTH - images[IMG_SELECT]->w) / 2; dest.y = 10; dest.w = images[IMG_SELECT]->w; dest.h = images[IMG_SELECT]->h; SDL_BlitSurface(images[IMG_SELECT], NULL, screen, &dest); } else { exiting--; if (exiting == 0) done = TRUE; } dest.x = 0; dest.y = (images[IMG_SELECT]->h + 10); dest.w = WIDTH; dest.h = HEIGHT - dest.y; SDL_FillRect(screen, &dest, SDL_MapRGB(screen->format, 0, 0, 0)); /* Draw stars: */ for (i = 0; i < MAX_STARS; i++) { drawline(stars[i].x, stars[i].y, mkcolor(0, 0, 0), stars[i].x - stars[i].z, stars[i].y, stars[i].color); stars[i].x = stars[i].x - stars[i].z; if (stars[i].x < 0) stars[i].x += WIDTH; } /* Draw level shape: */ if (level > 0) { level = level - 1; setshape(); anglex = 0; angley = 0; recalctrig(); for (i = 0; i < num_alleys; i++) { if (i < num_alleys - 1) { drawline3d(alley[i].x - 200, alley[i].y, 0, mkcolor(0, 128, 0), alley[i + 1].x - 200, alley[i + 1].y, 0, mkcolor(0, 64, 0)); } else if (alley_loops) { drawline3d(alley[i].x - 200, alley[i].y, 0, mkcolor(0, 128, 0), alley[0].x - 200, alley[0].y, 0, mkcolor(0, 64, 0)); } } level++; setshape(); } for (j = 5; j >= 1; j--) { anglex = 0; angley = frame * 10 + 20 - (j * 5); recalctrig(); for (i = 0; i < num_alleys; i++) { if (i < num_alleys - 1) { drawline3d(alley[i].x, alley[i].y, -125, mkcolor(0, 255 / j, 0), alley[i + 1].x, alley[i + 1].y, -125, mkcolor(0, 192 / j, 0)); } else if (alley_loops) { drawline3d(alley[i].x, alley[i].y, -125, mkcolor(0, 255 / j, 0), alley[0].x, alley[0].y, -125, mkcolor(0, 192 / j, 0)); } } } if (level < max_level) { level = level + 1; setshape(); anglex = 0; angley = 0; recalctrig(); for (i = 0; i < num_alleys; i++) { if (i < num_alleys - 1) { drawline3d(alley[i].x + 200, alley[i].y, 0, mkcolor(0, 128, 0), alley[i + 1].x + 200, alley[i + 1].y, 0, mkcolor(0, 64, 0)); } else if (alley_loops) { drawline3d(alley[i].x + 200, alley[i].y, 0, mkcolor(0, 128, 0), alley[0].x + 200, alley[0].y, 0, mkcolor(0, 64, 0)); } } level--; setshape(); } /* Play title screen music: */ #ifndef NOSOUND if (use_sound) { if (!Mix_PlayingMusic()) Mix_PlayMusic(musics[MUS_SELECT], 0); } #endif /* Pause: */ SDL_Flip(screen); now_time = SDL_GetTicks(); if (now_time < last_time + (1000 / FPS)) { SDL_Delay(last_time + 1000 / FPS - now_time); } } while (!done); #ifndef NOSOUND if (use_sound) { Mix_HaltMusic(); } #endif return(quit); } /* Title screen: */ int title(void) { int done, cmd, i, cz, fz, r1, g1, b1, r2, g2, b2, frame, fadein; Uint32 last_time, now_time; SDLKey key; SDL_Rect dest, src; SDL_Event event; done = FALSE; cmd = 0; frame = 0; level = -1; setshape(); cz = Z_DEPTH * 2; fz = Z_DEPTH * 2; fadein = 100; anglex = 0; angley = 0; recalctrig(); /* Title screen loop: */ do { frame++; last_time = SDL_GetTicks(); while (SDL_PollEvent(&event) > 0) { if (event.type == SDL_QUIT) { done = TRUE; cmd = CMD_QUIT; } else if (event.type == SDL_KEYDOWN) { key = event.key.keysym.sym; if (key == SDLK_RETURN) { done = TRUE; } else if (key == SDLK_ESCAPE) { cmd = CMD_QUIT; done = TRUE; } } } if (cz > -50) { cz = cz - 10; } else { if (fz > 50) { fz = fz - 20; } else { anglex = anglex + 5; recalctrig(); } } /* Clear screen: */ SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 0, 0, 0)); /* Draw "T" logo: */ for (i = 0; i < num_alleys; i++) { r1 = ((i + frame) * 20) % 255; g1 = ((num_alleys - ((i + frame) % num_alleys)) * 10) % 255; b1 = (255 - ((i * i) % 255)); drawline3d(alley[i].x, alley[i].y, cz, mkcolor(r1, g1, b1), alley[i].x, alley[i].y, fz, mkcolor(r1 / 2, g1 / 2, b1 / 2)); if (i < num_alleys - 1) { r2 = (((i + 1) + frame) * 20) % 255; g2 = ((num_alleys - (((i + 1) + frame) % num_alleys)) * 10) % 255; b2 = (255 - (((i + 1) * (i + 1)) % 255)); drawline3d(alley[i].x, alley[i].y, cz, mkcolor(r1, g1, b1), alley[i + 1].x, alley[i + 1].y, cz, mkcolor(r2, g2, b2)); drawline3d(alley[i].x, alley[i].y, fz, mkcolor(r1 / 2, g1 / 2, b1 / 2), alley[i + 1].x, alley[i + 1].y, fz, mkcolor(r2 / 2, g2 / 2, b2 / 2)); } else { r2 = ((frame) * 20) % 255; g2 = ((num_alleys - ((frame) % num_alleys)) * 10) % 255; b2 = 255; drawline3d(alley[i].x, alley[i].y, cz, mkcolor(r1, g1, b1), alley[0].x, alley[0].y, cz, mkcolor(r2, g2, b2)); drawline3d(alley[i].x, alley[i].y, fz, mkcolor(r1 / 2, g1 / 2, b1 / 2), alley[0].x, alley[0].y, fz, mkcolor(r2 / 2, g2 / 2, b2 / 2)); } } /* Draw title and credits: */ if (fz <= 50) { if (fadein > 0) { /* Fade title in: */ fadein--; for (i = (frame % ((fadein / 2) + 1)); i < images[IMG_TUMULT]->h; i = i + ((fadein / 2) + 1)) { dest.x = (((WIDTH - images[IMG_TUMULT]->w) / 2) + my_cos(i * 2 + frame * 10) * fadein); dest.y = i; dest.w = images[IMG_TUMULT]->w; dest.h = 1; src.x = 0; src.y = i; src.w = images[IMG_TUMULT]->w; src.h = 1; SDL_BlitSurface(images[IMG_TUMULT], &src, screen, &dest); } } else { dest.x = (WIDTH - images[IMG_TUMULT]->w) / 2; dest.y = 0; dest.w = images[IMG_TUMULT]->w; dest.h = images[IMG_TUMULT]->h; SDL_BlitSurface(images[IMG_TUMULT], NULL, screen, &dest); dest.x = (WIDTH - images[IMG_CREDITS]->w) / 2; dest.y = (HEIGHT - images[IMG_CREDITS]->h); dest.w = images[IMG_CREDITS]->w; dest.h = images[IMG_CREDITS]->h; SDL_BlitSurface(images[IMG_CREDITS], NULL, screen, &dest); } } /* Play title screen music: */ #ifndef NOSOUND if (use_sound) { if (!Mix_PlayingMusic()) Mix_PlayMusic(musics[MUS_TITLE], 0); } #endif /* Pause: */ SDL_Flip(screen); now_time = SDL_GetTicks(); if (now_time < last_time + (1000 / FPS)) { SDL_Delay(last_time + 1000 / FPS - now_time); } } while (!done); #ifndef NOSOUND if (use_sound) { Mix_HaltMusic(); } #endif return cmd; } /* Init the trig tables: */ void init_cos_table(void) { int i; for (i = 0; i < 3600; i++) { cos_table[i] = cos(M_PI * (i / 10.0) / 180.0); sin_table[i] = sin(M_PI * (i / 10.0) / 180.0); } } /* COS using trig tables: */ float my_cos(float ang) { while (ang < 0.0) ang = ang + 360.0; while (ang >= 360.0) ang = ang - 360.0; return cos_table[(int) ang * 10]; } /* SIN using trig tables: */ float my_sin(float ang) { while (ang < 0.0) ang = ang + 360.0; while (ang >= 360.0) ang = ang - 360.0; return sin_table[(int) ang * 10]; } /* Set random star: */ void set_rand_star(int i, int far) { stars[i].x = (rand() % (X_WIDTH * 8)) - (X_WIDTH * 4); stars[i].y = (rand() % (Y_HEIGHT * 8)) - (Y_HEIGHT * 4); if (far) stars[i].z = stars[i].z + (Z_DEPTH * 3); else stars[i].z = (rand() % (Z_DEPTH * 3)) - Z_DEPTH; stars[i].color = mkcolor((rand() % 3) * 127, (rand() % 3) * 127, (rand() % 3) * 127); } /* Decide the shape for this level's tunnel: */ void setshape(void) { int i; if (level == 0) { num_alleys = 36; for (i = 0; i < 36; i++) { alley[i].x = my_cos(i * 10) * 100 + my_sin(i * 40) * 20; alley[i].y = my_sin(i * 10) * 100; } alley_loops = TRUE; } else if (level == 1) { num_alleys = 18; for (i = 0; i < 18; i++) { alley[i].x = (9 - i) * 10; alley[i].y = 100; } alley_loops = FALSE; } else if (level == 2) { num_alleys = 17; for (i = 0; i < 17; i++) { alley[i].x = (9 - i) * 10; alley[i].y = 100 - abs(i - 8) * 10; } alley_loops = FALSE; } else if (level == 3) { num_alleys = 32; for (i = 0; i < 17; i++) { alley[i].x = (9 - i) * 10; alley[i].y = 100 - abs(i - 8) * 10; alley[32 - i].x = (9 - i) * 10; alley[32 - i].y = -100 + abs(i - 8) * 15; } alley_loops = TRUE; } else if (level == -1) { /* (Title screen shape) */ num_alleys = 18; alley[0].x = 0; alley[0].y = 160; alley[1].x = -50; alley[1].y = 200; alley[2].x = -40; alley[2].y = 100; alley[3].x = -30; alley[3].y = 0; alley[4].x = -20; alley[4].y = -100; alley[5].x = -150; alley[5].y = -80; alley[6].x = -140; alley[6].y = -120; alley[7].x = -150; alley[7].y = -160; alley[8].x = -100; alley[8].y = -140; /* (Right side is a mirror-image) */ for (i = 0; i < 9; i++) { alley[17 - i].x = -alley[i].x; alley[17 - i].y = alley[i].y; } alley_loops = TRUE; } } /* MAIN GAME FUNCTION! */ int game(void) { int done, quit; Uint32 frame; SDL_Event event; SDL_Rect dest; SDLKey key; Uint32 last_time, now_time; Uint8 r, g, b; int i, j, levelzoom, levelzoomm, oldcrab, crab, crabd, oldx, oldy, red, rx, ry, fire, lastfire, warp, warpm, al1, al2, shimmy, flying_img, flying_z, flying_flaming, x, y, zapping; color_type tmp_color; float scale; level_select(); setshape(); for (i = 0; i < MAX_STARS; i++) set_rand_star(i, FALSE); for (i = 0; i < MAX_BULLETS; i++) bullets[i].alive = FALSE; for (i = 0; i < MAX_ENEMIES; i++) enemies[i].alive = FALSE; for (i = 0; i < MAX_EXPLOSION_BITS; i++) explosion_bits[i].alive = FALSE; anglex = 0; angley = 0; recalctrig(); levelzoom = 1000; levelzoomm = -10; crab = 0; oldcrab = 0; fire = FALSE; lastfire = 0; oldx = 0; oldy = 0; frame = 0; warp = 0; warpm = 0; shimmy = 0; flying_img = -1; flying_z = 0; flying_flaming = FALSE; zapping = 0; done = FALSE; quit = FALSE; /* MAIN GAME LOOP! */ do { frame++; last_time = SDL_GetTicks(); while (SDL_PollEvent(&event) > 0) { if (event.type == SDL_QUIT) { quit = TRUE; } else if (event.type == SDL_KEYDOWN) { key = event.key.keysym.sym; if (key == SDLK_ESCAPE) done = TRUE; else if (key == SDLK_TAB) warpm = 2; else if (key == SDLK_1) shimmy = 10; else if (key == SDLK_2) { flying_img = IMG_MASTERFUL; flying_z = 400; flying_flaming = FALSE; } else if (key == SDLK_3) { flying_img = IMG_1UP; flying_z = 400; flying_flaming = TRUE; } else if (key == SDLK_4) { flying_img = IMG_AUTHOR; flying_z = 400; flying_flaming = TRUE; } else if (key == SDLK_5) { flying_img = IMG_RECHARGE; flying_z = 400; flying_flaming = FALSE; } else if (key == SDLK_p) { quit = pause_screen(); } } else if (event.type == SDL_MOUSEMOTION) { if (event.motion.y < HEIGHT / 2) crabd = -(oldx - event.motion.x); else crabd = (oldx - event.motion.x); if (event.motion.x < WIDTH / 2) crabd = crabd + (oldy - event.motion.y); else crabd = crabd - (oldy - event.motion.y); oldx = event.motion.x; oldy = event.motion.y; if (crabd < -CRAB_RES) crabd = -CRAB_RES; else if (crabd > CRAB_RES) crabd = CRAB_RES; crab = crab + crabd; if (alley_loops) { if (crab < 0) crab = crab + (num_alleys * CRAB_RES); else if (crab >= (num_alleys * CRAB_RES) - 1) crab = crab - ((num_alleys * CRAB_RES) - 1); } else { if (crab < 0) crab = 0; else if (crab >= (num_alleys - 1) * CRAB_RES) crab = ((num_alleys - 1) * CRAB_RES) - 1; } } else if (event.type == SDL_MOUSEBUTTONDOWN) { if (event.button.button == 1) fire = TRUE; else if (event.button.button == 3) { flying_img = IMG_DIGITALDEATH; flying_z = 400; flying_flaming = FALSE; zapping = 20; } } else if (event.type == SDL_MOUSEBUTTONUP) { if (event.button.button == 1) fire = FALSE; } } /* Play crab-moving sound: */ if ((crab / CRAB_RES) != (oldcrab / CRAB_RES)) { playsound(0, SND_BLEEP); } oldcrab = crab; /* Fire! */ if (fire && (frame - lastfire >= 4)) { if (crab / CRAB_RES < num_alleys) add_bullet(crab / CRAB_RES); else add_bullet(0); lastfire = frame; } /* Rotate view to keep focus on crab: */ if (anglex < -(alley[crab / CRAB_RES].x) / 10) anglex = anglex + 0.5; else if (anglex > -(alley[crab / CRAB_RES].x) / 10) anglex = anglex - 0.5; if (angley < -(alley[crab / CRAB_RES].y) / 10) angley = angley + 0.5; else if (angley > -(alley[crab / CRAB_RES].y) / 10) angley = angley - 0.5; recalctrig(); /* Move flying text: */ if (flying_img != -1) { flying_z = flying_z - 15; if (flying_z <= -Z_DEPTH) flying_img = -1; } /* Move stars: */ for (i = 0; i < MAX_STARS; i++) { stars[i].z = stars[i].z - 5 - warp; if (stars[i].z < -Z_DEPTH) set_rand_star(i, TRUE); } /* Move explosion bits: */ for (i = 0; i < MAX_EXPLOSION_BITS; i++) { if (explosion_bits[i].alive == TRUE) { explosion_bits[i].x += explosion_bits[i].xm; explosion_bits[i].y += explosion_bits[i].ym; explosion_bits[i].z += explosion_bits[i].zm; explosion_bits[i].time--; if (explosion_bits[i].time <= 0) explosion_bits[i].alive = FALSE; } } /* Handle warp: */ if (warpm != 0) { warp = warp + warpm; if (warpm > 0) levelzoom = levelzoom - 10; if (warp > 255) { /* Un-warp: */ warpm = -5; levelzoom = 1000; level++; setshape(); for (i = 0; i < MAX_ENEMIES; i++) { enemies[i].alive = FALSE; } #ifndef NOSOUND if (use_sound) { Mix_HaltMusic(); } #endif } else if (warp <= 0) { /* Stop warp: */ warp = 0; warpm = 0; levelzoomm = -10; } if ((frame % 10) == 0) playsound(2, SND_THRUST_LOW + warp / 86); } /* Handle shimmying: */ if (shimmy > 0) shimmy--; /* Move bullets: */ for (i = 0; i < MAX_BULLETS; i++) { if (bullets[i].alive) { bullets[i].z = bullets[i].z + 10; if (bullets[i].z > ALLEY_LENGTH) bullets[i].alive = FALSE; } } /* Move enemies: */ for (i = 0; i < MAX_ENEMIES; i++) { if (enemies[i].alive) { if (enemies[i].z > 0) enemies[i].z = enemies[i].z - 1; /* Check for collision with bullets: */ for (j = 0; j < MAX_BULLETS; j++) { if (bullets[j].alive && bullets[j].alley == enemies[i].alley && bullets[j].z >= enemies[i].z - 5 && bullets[j].z <= enemies[i].z + 5) { bullets[j].alive = 0; enemies[i].alive = 0; playsound(2, SND_POOF); add_explosion(enemies[i].alley, enemies[i].z); } } if (zapping == 1) { enemies[i].alive = FALSE; add_explosion(enemies[i].alley, enemies[i].z); } } else { if ((rand() % 100) == 0 && warpm == 0 && levelzoomm == 0) { enemies[i].alive = 1; enemies[i].alley = (rand() % num_alleys); enemies[i].z = ALLEY_LENGTH; } } } /* Handle mega-zapper: */ if (zapping > 0) { zapping--; if ((zapping % 2) == 0) { playsound(3, SND_BUZZ); } } /* Clear screen: */ if (!shimmy) { if (warp == 0) SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 0, 0, 0)); else SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 0, 0, warp / 4)); } else { dest.x = -shimmy + ((shimmy * 2) * (frame % 2)); dest.y = 0; dest.w = WIDTH; dest.h = HEIGHT; SDL_BlitSurface(screen, NULL, screen, &dest); } if (SDL_MUSTLOCK(screen)) SDL_LockSurface(screen); /* Draw stars: */ for (i = 0; i < MAX_STARS; i++) { scale = (float)(Z_DEPTH * 2 - stars[i].z) / (float)(Z_DEPTH * 3); if (warp == 0) { tmp_color = mkcolor(stars[i].color.r * scale, stars[i].color.g * scale, stars[i].color.b * scale); } else { tmp_color = mkcolor(stars[i].color.r - warp / 2, stars[i].color.g - warp / 2, stars[i].color.b + warp); } drawline3d(stars[i].x, stars[i].y, stars[i].z, tmp_color, stars[i].x, stars[i].y, stars[i].z - 5 - warp, tmp_color); } /* Draw explosion bits: */ for (i = 0; i < MAX_EXPLOSION_BITS; i++) { if (explosion_bits[i].alive && ((rand() % explosion_bits[i].time) > 1)) { drawpoint3d(explosion_bits[i].x, explosion_bits[i].y, explosion_bits[i].z + levelzoom, mkcolor(128 * (rand() % 3), 255, 128 * (rand() % 3)), TRUE); } } /* Draw tunnel: */ for (i = 0; i < num_alleys; i++) { red = 0; if (crab / CRAB_RES == i || crab / CRAB_RES == i - 1) red = 1; drawline3d(alley[i].x, alley[i].y, levelzoom, mkcolor(red * 255, 255, 0), alley[i].x, alley[i].y, ALLEY_LENGTH + levelzoom, mkcolor(red * 64, 64, 0)); if (crab / CRAB_RES == i) red = 1; else red = 0; if (i < num_alleys - 1) { drawline3d(alley[i].x, alley[i].y, levelzoom, mkcolor(red * 255, 255, 0), alley[i + 1].x, alley[i + 1].y, levelzoom, mkcolor(red * 255, 255, 0)); drawline3d(alley[i].x, alley[i].y, ALLEY_LENGTH + levelzoom, mkcolor(red * 64, 64, 0), alley[i + 1].x, alley[i + 1].y, ALLEY_LENGTH + levelzoom, mkcolor(red * 64, 64, 0)); } else if (alley_loops) { drawline3d(alley[i].x, alley[i].y, levelzoom, mkcolor(red * 255, 255, 0), alley[0].x, alley[0].y, levelzoom, mkcolor(red * 255, 255, 0)); drawline3d(alley[i].x, alley[i].y, ALLEY_LENGTH + levelzoom, mkcolor(red * 64, 64, 0), alley[0].x, alley[0].y, ALLEY_LENGTH + levelzoom, mkcolor(red * 64, 64, 0)); } } /* Draw enemies: */ for (i = 0; i < MAX_ENEMIES; i++) { if (enemies[i].alive) { al1 = enemies[i].alley; if (enemies[i].alley + 1 < num_alleys) al2 = enemies[i].alley + 1; else al2 = 0; drawline3d(alley[al1].x, alley[al1].y, enemies[i].z + levelzoom, mkcolor(255, 0, 0), alley[al2].x, alley[al2].y, enemies[i].z + levelzoom, mkcolor(255, 0, 0)); } } /* Draw bullets: */ for (i = 0; i < MAX_BULLETS; i++) { if (bullets[i].alive) { tmp_color = mkcolor(255 - (rand() % 64), 255 - (rand() % 64), 255 - (rand() % 64)); rx = (rand() % 5) + 5; ry = (rand() % 5) + 5; al1 = bullets[i].alley; if (al1 < num_alleys - 1) al2 = al1 + 1; else al2 = 0; for (j = 0; j < 3; j++) { drawline3d((alley[al1].x + alley[al2].x) / 2 - rx, (alley[al1].y + alley[al2].y) / 2 - ry, bullets[i].z + (rand() % 20) - 10 + levelzoom, tmp_color, (alley[al1].x + alley[al2].x) / 2 + rx, (alley[al1].y + alley[al2].y) / 2 + ry, bullets[i].z + (rand() % 20) - 10 + levelzoom, tmp_color); drawline3d((alley[al1].x + alley[al2].x) / 2 + rx, (alley[al1].y + alley[al2].y) / 2 - ry, bullets[i].z + (rand() % 20) - 10 + levelzoom, tmp_color, (alley[al1].x + alley[al2].x) / 2 - rx, (alley[al1].y + alley[al2].y) / 2 + ry, bullets[i].z + (rand() % 20) - 10 + levelzoom, tmp_color); } } } /* Draw Mega-Zapper */ if (zapping > 0) { for (i = 0; i < MAX_ENEMIES; i++) { if (enemies[i].alive && ((rand() % 4) == 0)) { draw_zap(crab / CRAB_RES, levelzoom, enemies[i].alley, enemies[i].z + levelzoom); } } } /* Handle zoom: */ if (levelzoom > -250 && levelzoomm < 0) { levelzoom = levelzoom + levelzoomm; if (levelzoom <= -250) { levelzoom = -250; levelzoomm = 2; } } else if (levelzoom < -200 && levelzoomm > 0) { levelzoom = levelzoom + levelzoomm; if (levelzoom >= -200) { levelzoom = -200; levelzoomm = 0; } } /* Draw any flying text: */ if (flying_img != -1) { if (flying_flaming) { for (i = 3; i >= 1; i--) { for (y = (frame % 4); y < images[flying_img]->h; y = y + 4) { for (x = ((frame / 2) % 4); x < images[flying_img]->w; x = x + 4) { SDL_GetRGB(getpixel(images[flying_img], x, y), images[flying_img]->format, &r, &g, &b); r = r / (i); g = g / (i + 1); b = b / (i + 1); if (r > 5 || g > 5 || b > 5) { drawpoint3d(x - (images[flying_img]->w / 2), y - (images[flying_img]->h / 2) - (20 * i + rand() % 5), flying_z + 10 * i + (rand() % 5), mkcolor(r, g, b), FALSE); } } } } } for (y = (frame % 2); y < images[flying_img]->h; y = y + 2) { for (x = ((frame / 2) % 2); x < images[flying_img]->w; x = x + 2) { SDL_GetRGB(getpixel(images[flying_img], x, y), images[flying_img]->format, &r, &g, &b); if (r > 5 || g > 5 || b > 5) { drawpoint3d(x - (images[flying_img]->w / 2), y - (images[flying_img]->h / 2), flying_z, mkcolor(r, g, b), FALSE); } } } } /* Play music: */ keep_playing_music(); if (SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen); /* Pause: */ SDL_Flip(screen); now_time = SDL_GetTicks(); if (now_time < last_time + (1000 / FPS)) { SDL_Delay(last_time + 1000 / FPS - now_time); } } while (!done && !quit); #ifndef NOSOUND if (use_sound) { Mix_HaltMusic(); } #endif return(quit); } /* Play current song if it's finished (or hasn't started yet)... */ void keep_playing_music(void) { #ifndef NOSOUND if (use_sound) { if (!Mix_PlayingMusic()) { Mix_PlayMusic(musics[MUS_GAME1 + (level % (NUM_MUSICS - MUS_GAME1))], 0); } } #endif } /* Pause screen loop! */ int pause_screen(void) { SDL_Event event; SDL_Rect dest; int done, quit, x, y, xx, yy; Uint8 tr, tg, tb; Uint32 pix, r, g, b; SDL_Surface * fuzz; done = FALSE; quit = FALSE; fuzz = SDL_DisplayFormat(screen); /* Blur the screen: */ for (y = 0; y < HEIGHT; y++) { for (x = 0; x < WIDTH; x++) { r = 0; g = 0; b = 0; for (yy = 0; yy < 4; yy++) { for (xx = 0; xx < 4; xx++) { SDL_GetRGB(getpixel(screen, x + xx, y + yy), screen->format, &tr, &tg, &tb); r = r + tr; g = g + tg; b = b + tb; } } r = r / 16; g = g / 16; b = b / 16; pix = SDL_MapRGB(fuzz->format, r, g, b); putpixel(fuzz, x, y, pix); } } SDL_BlitSurface(fuzz, NULL, screen, NULL); /* Place "PAUSED" text on screen: */ dest.x = (WIDTH - images[IMG_PAUSED]->w) / 2; dest.y = (HEIGHT - images[IMG_PAUSED]->h) / 2; dest.w = images[IMG_PAUSED]->w; dest.h = images[IMG_PAUSED]->h; SDL_BlitSurface(images[IMG_PAUSED], NULL, screen, &dest); SDL_Flip(screen); /* Pause loop! */ do { while (SDL_PollEvent(&event) > 0) { if (event.type == SDL_QUIT) { done = TRUE; quit = TRUE; } else if (event.type == SDL_KEYDOWN) done = TRUE; } SDL_Delay(50); keep_playing_music(); } while (!done); SDL_FreeSurface(fuzz); return(quit); } /* Draw vector: */ void drawline3d(float x1, float y1, float z1, color_type c1, float x2, float y2, float z2, color_type c2) { int sx1, sy1, sx2, sy2; if (calc3d(&sx1, &sy1, x1, y1, z1) && calc3d(&sx2, &sy2, x2, y2, z2)) drawline(sx1, sy1, c1, sx2, sy2, c2); } /* Draw vector with blur: */ void drawline3d_blur(float x1, float y1, float z1, color_type c1, color_type c1b, float x2, float y2, float z2, color_type c2, color_type c2b) { int sx1, sy1, sx2, sy2; if (calc3d(&sx1, &sy1, x1, y1, z1) && calc3d(&sx2, &sy2, x2, y2, z2)) { drawline(sx1 + 1, sy1, c1b, sx2 + 1, sy2, c2b); drawline(sx1 - 1, sy1, c1b, sx2 - 1, sy2, c2b); drawline(sx1, sy1 + 1, c1b, sx2, sy2 + 1, c2b); drawline(sx1, sy1 - 1, c1b, sx2, sy2 - 1, c2b); drawline(sx1, sy1, c1, sx2, sy2, c2); } } /* Draw point: */ void drawpoint3d(float x, float y, float z, color_type c, int thick) { int sx, sy; Uint32 pix; if (calc3d(&sx, &sy, x, y, z)) { if (sx >= 0 && sx < WIDTH && sy >= 0 && sy < HEIGHT) { pix = SDL_MapRGB(screen->format, c.r, c.g, c.b); putpixel(screen, sx, sy, pix); if (thick) { putpixel(screen, sx + 1, sy, pix); putpixel(screen, sx, sy + 1, pix); putpixel(screen, sx + 1, sy + 1, pix); } } } } /* Where does this line clip? */ unsigned char encode(float x, float y) { unsigned char code; code = 0x00; if (x < 0.0) code = code | LEFT_EDGE; else if (x >= (float) WIDTH) code = code | RIGHT_EDGE; if (y < 0.0) code = code | TOP_EDGE; else if (y >= (float) HEIGHT) code = code | BOTTOM_EDGE; return code; } /* Clip lines to window: */ int clip(int * x1, int * y1, int * x2, int * y2) { float fx1, fx2, fy1, fy2, tmp; unsigned char code1, code2; int done, draw, swapped; unsigned char ctmp; float m; fx1 = (float) *x1; fy1 = (float) *y1; fx2 = (float) *x2; fy2 = (float) *y2; done = FALSE; draw = FALSE; m = 0; swapped = FALSE; while (!done) { code1 = encode(fx1, fy1); code2 = encode(fx2, fy2); if (!(code1 | code2)) { done = TRUE; draw = TRUE; } else if (code1 & code2) { done = TRUE; } else { if (!code1) { swapped = TRUE; tmp = fx1; fx1 = fx2; fx2 = tmp; tmp = fy1; fy1 = fy2; fy2 = tmp; ctmp = code1; code1 = code2; code2 = ctmp; } if (fx2 != fx1) m = (fy2 - fy1) / (fx2 - fx1); else m = 1; if (code1 & LEFT_EDGE) { fy1 += ((0 - (fx1)) * m); fx1 = 0; } else if (code1 & RIGHT_EDGE) { fy1 += (((WIDTH - 1) - (fx1)) * m); fx1 = (WIDTH - 1); } else if (code1 & TOP_EDGE) { if (fx2 != fx1) fx1 += ((0 - (fy1)) / m); fy1 = 0; } else if (code1 & BOTTOM_EDGE) { if (fx2 != fx1) fx1 += (((HEIGHT - 1) - (fy1)) / m); fy1 = (HEIGHT - 1); } } } if (swapped) { tmp = fx1; fx1 = fx2; fx2 = tmp; tmp = fy1; fy1 = fy2; fy2 = tmp; } *x1 = (int) fx1; *y1 = (int) fy1; *x2 = (int) fx2; *y2 = (int) fy2; return(draw); } /* Draw a line: */ void drawline(int x1, int y1, color_type c1, int x2, int y2, color_type c2) { int dx, dy; float cr, cg, cb, rd, gd, bd; float m, b; if (clip(&x1, &y1, &x2, &y2)) { dx = x2 - x1; dy = y2 - y1; if (dx != 0) { m = ((float) dy) / ((float) dx); b = y1 - m * x1; if (x2 >= x1) dx = 1; else dx = -1; cr = c1.r; cg = c1.g; cb = c1.b; rd = (float) (c2.r - c1.r) / (float) (x2 - x1) * dx; gd = (float) (c2.g - c1.g) / (float) (x2 - x1) * dx; bd = (float) (c2.b - c1.b) / (float) (x2 - x1) * dx; while (x1 != x2) { y1 = m * x1 + b; y2 = m * (x1 + dx) + b; drawvertline(x1, y1, mkcolor(cr, cg, cb), y2, mkcolor(cr + rd, cg + gd, cb + bd)); x1 = x1 + dx; cr = cr + rd; cg = cg + gd; cb = cb + bd; } } else drawvertline(x1, y1, c1, y2, c2); } } /* Draw a verticle line: */ void drawvertline(int x, int y1, color_type c1, int y2, color_type c2) { int tmp, dy; float cr, cg, cb, rd, gd, bd; if (y1 > y2) { tmp = y1; y1 = y2; y2 = tmp; tmp = c1.r; c1.r = c2.r; c2.r = tmp; tmp = c1.g; c1.g = c2.g; c2.g = tmp; tmp = c1.b; c1.b = c2.b; c2.b = tmp; } cr = c1.r; cg = c1.g; cb = c1.b; if (y1 != y2) { rd = (float) (c2.r - c1.r) / (float) (y2 - y1); gd = (float) (c2.g - c1.g) / (float) (y2 - y1); bd = (float) (c2.b - c1.b) / (float) (y2 - y1); } else { rd = 0; gd = 0; bd = 0; } for (dy = y1; dy <= y2; dy++) { putpixel(screen, x, dy, SDL_MapRGB(screen->format, (Uint8) cr, (Uint8) cg, (Uint8) cb)); cr = cr + rd; cg = cg + gd; cb = cb + bd; } } /* Get a pixel: */ Uint32 getpixel(SDL_Surface * surface, int x, int y) { int bpp; Uint8 * p; /* Determine bytes-per-pixel for the surface in question: */ bpp = surface->format->BytesPerPixel; /* Set a pointer to the exact location in memory of the pixel in question: */ p = (Uint8 *) (surface->pixels + /* Start at beginning of RAM */ (y * surface->pitch) + /* Go down Y lines */ (x * bpp)); /* Go in X pixels */ /* Assuming the X/Y values are within the bounds of this surface... */ if (x >= 0 && y >= 0 && x < surface -> w && y < surface -> h) { /* Return the correctly-sized piece of data containing the pixel's value (an 8-bit palette value, or a 16-, 24- or 32-bit RGB value) */ if (bpp == 1) /* 8-bit display */ return *p; else if (bpp == 2) /* 16-bit display */ return *(Uint16 *)p; else if (bpp == 3) /* 24-bit display */ { /* Depending on the byte-order, it could be stored RGB or BGR! */ if (SDL_BYTEORDER == SDL_BIG_ENDIAN) return p[0] << 16 | p[1] << 8 | p[2]; else return p[0] | p[1] << 8 | p[2] << 16; } else if (bpp == 4) /* 32-bit display */ return *(Uint32 *)p; else return 0; /* (Should never occur) */ } else return 0; /* (Out of bounds? Just return zero) */ } /* Draw a single pixel into the surface: */ void putpixel(SDL_Surface * surface, int x, int y, Uint32 pixel) { int bpp; Uint8 * p; /* Assuming the X/Y values are within the bounds of this surface... */ if (x >= 0 && y >= 0 && x < WIDTH && y < HEIGHT) { /* Determine bytes-per-pixel for the surface in question: */ bpp = surface->format->BytesPerPixel; /* Set a pointer to the exact location in memory of the pixel in question: */ p = (Uint8 *) (surface->pixels + /* Start at beginning of RAM */ (y * surface->pitch) + /* Go down Y lines */ (x * bpp)); /* Go in X pixels */ /* Set the (correctly-sized) piece of data in the surface's RAM to the pixel value sent in: */ if (bpp == 1) *p = pixel; else if (bpp == 2) *(Uint16 *)p = pixel; else if (bpp == 3) { if (SDL_BYTEORDER == SDL_BIG_ENDIAN) { p[0] = (pixel >> 16) & 0xff; p[1] = (pixel >> 8) & 0xff; p[2] = pixel & 0xff; } else { p[0] = pixel & 0xff; p[1] = (pixel >> 8) & 0xff; p[2] = (pixel >> 16) & 0xff; } } else if (bpp == 4) { *(Uint32 *)p = pixel; } } } /* Convert 3D coordinate into screen coordinate: */ int calc3d(int * sx, int * sy, float x, float y, float z) { float xx, yy, zz; int ok; ok = FALSE; xx = x * cos_anglex - z * sin_anglex; zz = x * sin_anglex + z * cos_anglex; yy = y * cos_angley - zz * sin_angley; zz = y * sin_angley + zz * cos_angley; if (zz > -DISTANCE * 2) { if (zz <= -DISTANCE) zz = -DISTANCE + 1; /* Convert (x,y,z) into (x,y): */ *sx = xx / ((zz + DISTANCE) / ASPECT); *sy = yy / ((zz + DISTANCE) / ASPECT); /* Transpose (0,0) origin to the center of the window: */ *sx = *sx + WIDTH / 2; *sy = *sy + HEIGHT / 2; ok = TRUE; } return ok; } /* Recalculate the trig. values: */ void recalctrig(void) { cos_anglex = my_cos(anglex); sin_anglex = my_sin(anglex); cos_angley = my_cos(angley); sin_angley = my_sin(angley); } /* Create a color_type struct out of RGB values: */ color_type mkcolor(int r, int g, int b) { color_type c; if (r > 255) r = 255; if (g > 255) g = 255; if (b > 255) b = 255; c.r = (Uint8) r; c.g = (Uint8) g; c.b = (Uint8) b; return c; } /* Setup function: */ void setup(int argc, char * argv[]) { int fullscreen, i; /* Set default settings: */ fullscreen = FALSE; use_sound = TRUE; max_level = 3; /* Get command-line arguments: */ /* FIXME: do it! */ /* Init video: */ if (SDL_Init(SDL_INIT_VIDEO) < 0) { fprintf(stderr, "\nError: I could not initialize video!\n" "The Simple DirectMedia error that occured was:\n" "%s\n\n", SDL_GetError()); exit(1); } /* Open window: */ if (fullscreen) { screen = SDL_SetVideoMode(WIDTH, HEIGHT, 16, SDL_FULLSCREEN | SDL_HWSURFACE); if (screen == NULL) { fprintf(stderr, "\nWarning: I could not open the display in fullscreen mode.\n" "The Simple DirectMedia error that occured was:\n" "%s\n\n", SDL_GetError()); fullscreen = FALSE; } } if (!fullscreen) { screen = SDL_SetVideoMode(WIDTH, HEIGHT, 16, SDL_HWSURFACE); if (screen == NULL) { fprintf(stderr, "\nError: I could not open the display.\n" "The Simple DirectMedia error that occured was:\n" "%s\n\n", SDL_GetError()); exit(1); } } /* Load images: */ for (i = 0; i < NUM_IMAGES; i++) { images[i] = IMG_Load(image_filenames[i]); if (images[i] == NULL) { fprintf(stderr, "\nError: I could not load the image file:\n" "%s\n" "The Simple DirectMedia error that occured was:\n" "%s\n\n", image_filenames[i], SDL_GetError()); exit(1); } } /* Set window's icon and title: */ seticon(); SDL_WM_SetCaption("Tumult", "Tumult"); /* Init. audio: */ #ifndef NOSOUND if (use_sound) { if (SDL_Init(SDL_INIT_AUDIO) < 0) { fprintf(stderr, "\nWarning: I could not initialize audio!\n" "The Simple DirectMedia error that occured was:\n" "%s\n\n", SDL_GetError()); use_sound = 0; } } if (use_sound) { if (Mix_OpenAudio(44100, AUDIO_S16, 2, 256) < 0) { fprintf(stderr, "\nWarning: I could not set up audio for 44100 Hz " "16-bit stereo.\n" "The Simple DirectMedia error that occured was:\n" "%s\n\n", SDL_GetError()); use_sound = 0; } } if (use_sound) { /* Load sounds: */ for (i = 0; i < NUM_SOUNDS; i++) { sounds[i] = Mix_LoadWAV(sound_filenames[i]); if (sounds[i] == NULL) { fprintf(stderr, "\nWarning: I could not load the sound file:\n" "%s\n" "The Simple DirectMedia error that occured was:\n" "%s\n\n", sound_filenames[i], SDL_GetError()); use_sound = 0; i = NUM_SOUNDS; } } } if (use_sound) { /* Load musics: */ for (i = 0; i < NUM_MUSICS; i++) { musics[i] = Mix_LoadMUS(music_filenames[i]); if (musics[i] == NULL) { fprintf(stderr, "\nWarning: I could not load the music file:\n" "%s\n" "The Simple DirectMedia error that occured was:\n" "%s\n\n", music_filenames[i], SDL_GetError()); use_sound = 0; i = NUM_MUSICS; } } } #endif /* Seed random-number generator: */ srand(SDL_GetTicks()); /* Init trig stuff: */ init_cos_table(); /* Init 3D vars: */ anglex = 0.0; angley = 0.0; recalctrig(); } /* Set icon: */ void seticon(void) { int masklen; Uint8 * mask; SDL_Surface * icon; /* Load icon into a surface: */ icon = IMG_Load(DATA_PREFIX "/images/icon.png"); if (icon == NULL) { fprintf(stderr, "\nWarning: I could not load the icon image: %s\n" "The Simple DirectMedia error that occured was:\n" "%s\n\n", DATA_PREFIX "images/icon.png", SDL_GetError()); return; } /* Create mask: */ masklen = (((icon -> w) + 7) / 8) * (icon -> h); mask = malloc(masklen * sizeof(Uint8)); memset(mask, 0xFF, masklen); /* Set icon: */ SDL_WM_SetIcon(icon, mask); /* Free icon surface & mask: */ free(mask); SDL_FreeSurface(icon); } /* My own sign func: */ int sgn(int x) { if (x < 0) return -1; else if (x == 0) return 0; else return 1; } /* Add a player's bullet: */ void add_bullet(int alley) { int i, found; found = -1; for (i = 0; i < MAX_BULLETS && found == -1; i++) { if (!bullets[i].alive) found = i; } if (found != -1) { bullets[found].alive = TRUE; bullets[found].alley = alley; bullets[found].z = 0; playsound(1, SND_LASER); } } /* Play a sound effect: */ void playsound(int chan, int snd) { #ifndef NOSOUND if (use_sound) { Mix_PlayChannel(chan, sounds[snd], 0); } #endif } /* Draw a zap bolt: */ void draw_zap(int alley1, int z1, int alley2, int z2) { int al11, al12, al21, al22; /* Star from crab: */ if (alley1 < num_alleys) al11 = alley1; else al11 = 0; if (alley1 < num_alleys - 1) al12 = alley1 + 1; else al12 = 0; /* Go to target: */ al21 = alley2; if (alley2 < num_alleys - 1) al22 = al21 + 1; else al22 = 0; draw_lightning((alley[al11].x + alley[al12].x) / 2, (alley[al11].y + alley[al12].y) / 2, z1, (alley[al21].x + alley[al22].x) / 2, (alley[al21].y + alley[al22].y) / 2, z2); } /* Draw a lightning bolt from one x,y,z point to another (moving along z) */ void draw_lightning(int x1, int y1, int z1, int x2, int y2, int z2) { float z, x, y, xm, ym; int off_x, off_y, off_z, last_off_x, last_off_y, last_off_z; float colr, colrm; x = x1; y = y1; colr = 128; xm = (x2 - x1) / ((z2 - z1) / 10.0); ym = (y2 - y1) / ((z2 - z1) / 10.0); colrm = (255 - colr) / ((z2 - z1) / 10.0); last_off_x = (rand() % 5) - 2; last_off_y = (rand() % 5) - 2; last_off_z = (rand() % 3) - 1; for (z = z1; z < z2; z = z + 10) { off_x = (rand() % 11) - 5; off_y = (rand() % 11) - 5; off_z = (rand() % 5) - 2; drawline3d_blur(x + last_off_x, y + last_off_y, z + last_off_z, mkcolor(colr, colr, 255), mkcolor(colr / 2, 128, 128), x + off_x + xm, y + off_y + ym, z + off_z + 10, mkcolor(colr + colrm, colr + colrm, 255), mkcolor((colr + colrm) / 2, 128, 128)); last_off_x = off_x; last_off_y = off_y; last_off_z = off_z; x = x + xm; y = y + ym; colr = colr + colrm; } } void add_explosion(int al1, int z) { int i, x, y, al2; if (al1 < num_alleys - 1) al2 = al1 + 1; else al2 = 0; x = (alley[al1].x + alley[al2].x) / 2; y = (alley[al1].y + alley[al2].y) / 2; for (i = 0; i < 6; i++) { add_explosion_bit(x + (rand() % 5) - 2, y + (rand() % 5) - 2, z + (rand() % 5) - 2); } } void add_explosion_bit(int x, int y, int z) { int i, found; found = -1; for (i = 0; i < MAX_EXPLOSION_BITS && found == -1; i++) { if (explosion_bits[i].alive == FALSE) found = i; } if (found != -1) { explosion_bits[found].alive = TRUE; explosion_bits[found].time = 50; explosion_bits[found].x = x; explosion_bits[found].y = y; explosion_bits[found].z = z; explosion_bits[found].xm = (rand() % 11) - 5; explosion_bits[found].ym = (rand() % 11) - 5; explosion_bits[found].zm = (rand() % 11) - 5; } }