Yes, it’s finally here, with comments and everything! Below is the code for the C file and I’ve included all the files with a readme.txt file for your perusal here. I hope this helps you to get started on your gameboy development journeys!
gbdkdemo .zip file, 6kb
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//////////////////////////////////////////////////////////////////////////////// // DEMOGAME.C //------------------------------------------------------------------------------ // FAIRLY MINIMAL GAME DEMO FOR GETTING STARTED WITH GBDK // BY REFRESH GAMES //------------------------------------------------------------------------------ // THIS IS INTENDED TO BE A BASE POINT FOR ANYONE TO CUSTOMISE AND ADD TO SO // THEY CAN MAKE THEIR OWN GAMEBOY GAMES, HENCE THE COMMENTS! //------------------------------------------------------------------------------ // WEB: refreshgames.co.uk //////////////////////////////////////////////////////////////////////////////// #include // INCLUDE RANDOM FUNCTIONS #include ; // INCLUDE GBDK FUNCTION LIBRARY #include ; // INCLUDE HANDY HARDWARE REFERENCES // FUNCTION DECLARATIONS void initGame(); // INITIALISE OUR GAME void updatePlayer(); // UPDATE OUR PLAYER UINT8 collisionCheck(UINT8, UINT8, UINT8, UINT8, UINT8, UINT8, UINT8, UINT8); // SIMPLE RECT TO RECT CHECK // VARIABLE DECLARATIONS - STORED IN RAM UINT8 i, j; // GENERIC LOOPING VARIABLE UINT8 playerX, playerY; // PLAYER CO-ORDINATES UINT8 eX[10], eY[10]; // ENEMY CO-ORDINATES UINT8 lastKeys; // HOLDS KEYS FOR THE PREVIOUS FRAME UINT8 randomBkgTiles[20]; // CONTAINS RANDOM DATA FOR OUR BKG // SPRITE DATA - 14 SPRITES - STORED IN ROM const unsigned char sprites[] = {0x3C,0x3C,0x42,0x42,0xA9,0xA9,0xA9,0xA9,0x81,0x81,0x91,0x91,0x42,0x42,0x3C,0x3C,0x3C,0x3C,0x42,0x42,0x81,0x81,0xED,0xED,0x81,0x81,0x91,0x91,0x42,0x42,0x3C,0x3C,0x99,0x81,0x42,0x5A,0x24,0x3C,0x99,0x7E,0x99,0x7E,0x24,0x3C,0x42,0x5A,0x99,0x81,0x38,0x04,0x7C,0x02,0x5C,0x22,0x5C,0x22,0x5C,0x22,0x5C,0x22,0x7C,0x02,0x38,0x04,0x00,0x00,0x3E,0x3E,0x63,0x63,0x63,0x63,0x63,0x63,0x63,0x63,0x3E,0x3E,0x00,0x00,0x00,0x00,0x1C,0x1C,0x3C,0x3C,0x6C,0x6C,0x0C,0x0C,0x0C,0x0C,0x7F,0x7F,0x00,0x00,0x00,0x00,0x3E,0x3E,0x63,0x63,0x03,0x03,0x1E,0x1E,0x70,0x70,0x7F,0x7F,0x00,0x00,0x00,0x00,0x7F,0x7F,0x03,0x03,0x3E,0x3E,0x07,0x07,0x43,0x43,0x3E,0x3E,0x00,0x00,0x00,0x00,0x60,0x60,0x6C,0x6C,0x6C,0x6C,0x7F,0x7F,0x0C,0x0C,0x0C,0x0C,0x00,0x00,0x00,0x00,0x7F,0x7F,0x60,0x60,0x7E,0x7E,0x03,0x03,0x63,0x63,0x3E,0x3E,0x00,0x00,0x00,0x00,0x3F,0x3F,0x60,0x60,0x7E,0x7E,0x63,0x63,0x63,0x63,0x3E,0x3E,0x00,0x00,0x00,0x00,0x7F,0x7F,0x03,0x03,0x06,0x06,0x0C,0x0C,0x18,0x18,0x30,0x30,0x00,0x00,0x00,0x00,0x3E,0x3E,0x63,0x63,0x63,0x63,0x3E,0x3E,0x63,0x63,0x3E,0x3E,0x00,0x00,0x00,0x00,0x3E,0x3E,0x63,0x63,0x63,0x63,0x3F,0x3F,0x03,0x03,0x7E,0x7E,0x00,0x00}; //BACKGROUND DATA - 4 SPRITES - STORED IN ROM const unsigned char myBkgData[] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,0x08,0x00,0x36,0x00,0x08,0x00,0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x50,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x04,0x00,0x0E,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x50,0x00,0x20,0x00,0x50,0x00,0x00,0x00}; //////////////////////////////////////////////////////////////////////////////// // MAIN FUNCTION void main(){ initGame(); // RAN ONCE AT STARTUP // GAME LOOP START while(1){ updatePlayer(); // UPDATE PLAYER HIDE_WIN; // SHOW WINDOW LAYER SHOW_SPRITES; // HIDE SPRITES LAYER SHOW_BKG; // SHOW BACKGROUND LAYER lastKeys = joypad(); // UPDATE OUR KEYPRESSES wait_vbl_done(); // WAIT FOR VBLANK TO FINISH - ENSURES 60 FRAMES PER SECOND MAXIMUM } // GAME LOOP END } //////////////////////////////////////////////////////////////////////////////// // INIT GAME void initGame(){ DISPLAY_ON; // TURNS ON THE GAMEBOY LCD NR52_REG = 0x8F; // TURN SOUND ON NR51_REG = 0x11; // ENABLE SOUND CHANNELS NR50_REG = 0x1F; // VOLUME MAX = 0x77, MIN = 0x00 initrand(DIV_REG); // SEED OUR RANDOMIZER set_sprite_data(0, 14, sprites); // STORE OUR SPRITE DATA AT THE START OF SPRITE VRAM set_bkg_data(0, 4, myBkgData); // STORE OUR BKG DATA AT THE START OF BKG VRAM - NOTE, THE WINDOW LAYER SHARED THE BKG VRAM BY DEFAULT playerX = 64; // PLAYERS INITAL X POSITION playerY = 64; // PLAYERS INITAL Y POSITION set_sprite_tile(0,0); //PLAYERS SPRITE TILE - 0 for (i=0; i !=10; i++){ // OUR ENEMY POSITION LOOP - NOTE, USE !=, NOT < TO SCRAPE BACK SOME CPU TIME eX[i] = 16+(rand() >> 1); // RANDOM X POSITION 16 - 144 eY[i] = 16+(rand() >> 1); // RANDOM Y POSITION 16 - 144 set_sprite_tile(i+1, 2); // ENEMIES SRITE TILE - SET TO SPRITE 2 move_sprite(i+1,eX[i], eY[i]); // POSITION ENEMIES } // GENERATE RANDOM BKG TILE DATA - SO STARRY! for (j=0; j != 18; j++){ for (i=0; i != 20; i++){ randomBkgTiles[i] = rand() % 4; } set_bkg_tiles(0,j,20,1,randomBkgTiles); // SET A LINE OF BKG DATA (X, Y, W, H, DATA) } } //////////////////////////////////////////////////////////////////////////////// // UPDATE PLAYER void updatePlayer(){ // MOTION VIA DPAD - LIMITED TO A CERTAIN AREA ON SCREEN // UP if (joypad() & J_UP){ playerY--; if (playerY == 15){ playerY = 16; } } // DOWN if (joypad() & J_DOWN){ playerY++; if (playerY == 153){ playerY = 152; } } // LEFT if (joypad() & J_LEFT){ playerX--; if (playerX == 7){ playerX = 8; } } // RIGHT if (joypad() & J_RIGHT){ playerX++; if (playerX == 161){ playerX = 160; } } // END MOTION VIA DPAD // TAP A - PLAYS A RANDOM BEEP THROUGH SOUND CHANNEL 1 - SQUARE WAVE CHANNEL if (joypad() & J_A){ NR11_REG = 0x7f; // SQUARE WAVE DUTY NR12_REG = 0x7f; // VOLUME 0 = quietest, 255 = loudest NR13_REG = DIV_REG; // LOWER BITS OF SOUND FREQ NR14_REG = 0x80 + (DIV_REG % 8); // LARGER SOUND FREQ - MINIMUM OF 128 - TOP 3 BYTES - ANY LESS = SOUND CHANNEL SWITCHES OFF } else { NR11_REG = 0x00; // NO A BUTTON - NO SOUND NR12_REG = 0x00; NR13_REG = 0x00; NR14_REG = 0x00; } //MOVE OUR SPRITE move_sprite(0,playerX,playerY); // POSITION OUR SPRITE ON THE SCREEN j=0; // RE-USE J AS A FLAG TO SEE IF WE HAVE COLLIDED WITH AN ENEMY for (i=0; i != 10; i++){ // LOOP THROUGH OUR 10 ENEMIES if (collisionCheck(playerX, playerY, 8, 8, eX[i], eY[i], 8, 8) == 1){ j= 1; // IF WE COLLIDED, SET OUR FLAG VARIABLE, J TO 1 } } // ADJUST OUR PLAYER SPRITES FRAME IF THEY HIT SOMETHING switch (j){ // NO HIT case 0: set_sprite_tile(0,0); break; // HIT ENEMY default: set_sprite_tile(0,1); break; } } //////////////////////////////////////////////////////////////////////////////// // COLLISION CHECKER - SIMPLE RECTANGLE COLLISION CHECKING // RETURNS 1 IF OVERLAPPING UINT8 collisionCheck(UINT8 x1, UINT8 y1, UINT8 w1, UINT8 h1, UINT8 x2, UINT8 y2, UINT8 w2, UINT8 h2){ if ((x1 < (x2+w2)) && ((x1+w1) > x2) && (y1 < (h2+y2)) && ((y1+h1) > y2)){ return 1; } else { return 0; } } |
