399 lines
20 KiB
C
399 lines
20 KiB
C
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#include <string.h>
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typedef unsigned char byte;
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typedef signed char sbyte;
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typedef unsigned short word;
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// PLATFORM DEFINITION
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__sfr __at (0x0) input0;
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__sfr __at (0x1) input1;
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__sfr __at (0x2) input2;
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__sfr __at (0x3) input3;
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__sfr __at (0x1) ay8910_reg;
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__sfr __at (0x2) ay8910_data;
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__sfr __at (0x8) assert_coin_status;
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__sfr __at (0x40) palette;
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byte __at (0xe000) cellram[28][32];
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byte __at (0xe800) tileram[256][8];
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#define LEFT1 !(input1 & 0x10)
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#define RIGHT1 !(input1 & 0x20)
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#define UP1 !(input1 & 0x40)
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#define DOWN1 !(input1 & 0x80)
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#define FIRE1 !(input2 & 0x20)
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#define START1 !(input2 & 0x10)
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#define START2 !(input3 & 0x20)
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#define TIMER500HZ (input2 & 0x8)
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#define COIN1 (input3 & 0x8)
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// GAME DATA
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typedef struct {
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byte x;
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byte y;
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byte dir;
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word score;
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char head_attr;
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char tail_attr;
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char collided:1;
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char human:1;
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} Player;
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Player players[2];
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byte attract;
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byte credits = 0;
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byte frames_per_move;
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#define START_SPEED 12
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#define MAX_SPEED 5
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#define MAX_SCORE 7
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// GAME CODE
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void main();
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void gsinit();
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// start routine @ 0x0
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void start() {
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__asm
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LD SP,#0xE800 ; set up stack pointer
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DI ; disable interrupts
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__endasm;
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gsinit();
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main();
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}
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#define INIT_MAGIC 0xdeadbeef
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static long is_initialized = INIT_MAGIC;
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// set initialized portion of global memory
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// by copying INITIALIZER area -> INITIALIZED area
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void gsinit() {
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// already initialized? skip it
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if (is_initialized == INIT_MAGIC)
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return;
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__asm
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; copy initialized data to RAM
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LD BC, #l__INITIALIZER
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LD A, B
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LD DE, #s__INITIALIZED
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LD HL, #s__INITIALIZER
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LDIR
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__endasm;
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}
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// SOUND CODE
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inline void set8910(byte reg, byte data) {
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if (attract) return; // no sound in attract mode
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ay8910_reg = reg;
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ay8910_data = data;
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}
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////////
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// https://en.wikipedia.org/wiki/Linear-feedback_shift_register#Galois_LFSRs
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static word lfsr = 1;
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word rand() {
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byte lsb = lfsr & 1; /* Get LSB (i.e., the output bit). */
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lfsr >>= 1; /* Shift register */
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if (lsb) { /* If the output bit is 1, apply toggle mask. */
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lfsr ^= 0xB400u;
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}
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return lfsr;
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}
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void delay(byte msec) {
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while (msec--) {
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while (TIMER500HZ != 0) lfsr++;
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while (TIMER500HZ == 0) lfsr++;
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}
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}
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#define PE(fg,bg) (((fg)<<5) | ((bg)<<1))
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const byte __at (0x4000) color_prom[32] = {
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PE(7,0),PE(3,0),PE(1,0),PE(3,0),PE(6,0),PE(3,0),PE(2,0),PE(6,0),
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PE(7,0),PE(3,0),PE(1,0),PE(3,0),PE(6,0),PE(3,0),PE(2,0),PE(6,0),
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PE(7,0),PE(3,0),PE(1,0),PE(3,0),PE(6,0),PE(3,0),PE(2,0),PE(6,0),
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PE(7,0),PE(3,0),PE(1,0),PE(3,0),PE(6,0),PE(3,0),PE(2,0),PE(6,0),
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};
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#define LOCHAR 0x0
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#define HICHAR 0xff
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#define CHAR(ch) (ch-LOCHAR)
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void clrscr() {
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memset(cellram, CHAR(' '), sizeof(cellram));
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}
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byte getchar(byte x, byte y) {
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return cellram[x][y];
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}
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void putchar(byte x, byte y, byte attr) {
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cellram[x][y] = attr;
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}
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void putstring(byte x, byte y, const char* string) {
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while (*string) {
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putchar(x++, y, CHAR(*string++));
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}
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}
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// PC font (code page 437)
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const byte font8x8[0x100][8] = {/*{w:8,h:8,bpp:1,count:256,xform:"scaleX(-1) rotate(90deg)"}*/
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{ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, { 0x7e,0x81,0x95,0xb1,0xb1,0x95,0x81,0x7e }, { 0x7e,0xff,0xeb,0xcf,0xcf,0xeb,0xff,0x7e }, { 0x0e,0x1f,0x3f,0x7e,0x3f,0x1f,0x0e,0x00 }, { 0x08,0x1c,0x3e,0x7f,0x3e,0x1c,0x08,0x00 }, { 0x38,0x3a,0x9f,0xff,0x9f,0x3a,0x38,0x00 }, { 0x10,0x38,0xbc,0xff,0xbc,0x38,0x10,0x00 }, { 0x00,0x00,0x18,0x3c,0x3c,0x18,0x00,0x00 }, { 0xff,0xff,0xe7,0xc3,0xc3,0xe7,0xff,0xff }, { 0x00,0x3c,0x66,0x42,0x42,0x66,0x3c,0x00 }, { 0xff,0xc3,0x99,0xbd,0xbd,0x99,0xc3,0xff }, { 0x70,0xf8,0x88,0x88,0xfd,0x7f,0x07,0x0f }, { 0x00,0x4e,0x5f,0xf1,0xf1,0x5f,0x4e,0x00 }, { 0xc0,0xe0,0xff,0x7f,0x05,0x05,0x07,0x07 }, { 0xc0,0xff,0x7f,0x05,0x05,0x65,0x7f,0x3f }, { 0x99,0x5a,0x3c,0xe7,0xe7,0x3c,0x5a,0x99 }, { 0x7f,0x3e,0x3e,0x1c,0x1c,0x08,0x08,0x00 }, { 0x08,0x08,0x1c,0x1c,0x3e,0x3e,0x7f,0x00 }, { 0x00,0x24,0x66,0xff,0xff,0x66,0x24,0x00 }, { 0x00,0x5f,0x5f,0x00,0x00,0x5f,0x5f,0x00 }, { 0x06,0x0f,0x09,0x7f,0x7f,0x01,0x7f,0x7f }, { 0xda,0xbf,0xa5,0xa5,0xfd,0x59,0x03,0x02 }, { 0x00,0x70,0x70,0x70,0x70,0x70,0x70,0x00 }, { 0x80,0x94,0xb6,0xff,0xff,0xb6,0x94,0x80 }, { 0x00,0x04,0x06,0x7f,0x7f,0x06,0x04,0x00 }, { 0x00,0x10,0x30,0x7f,0x7f,0x30,0x10,0x00 }, { 0x08,0x08,0x08,0x2a,0x3e,0x1c,0x08,0x00 }, { 0x08,0x1c,0x3e,0x2a,0x08,0x08,0x08,0x00 }, { 0x3c,0x3c,0x20,0x20,0x20,0x20,0x20,0x00 }, { 0x08,0x1c,0x3e,0x08,0x08,0x3e,0x1c,0x08 }, { 0x30,0x38,0x3c,0x3e,0x3e,0x3c,0x38,0x30 }, { 0x06,0x0e,0x1e,0x3e,0x3e,0x1e,0x0e,0x06 }, { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, { 0x00,0x06,0x5f,0x5f,0x06,0x00,0x00,0x00 }, { 0x00,0x07,0x07,0x00,0x07,0x07,0x00,0x00 }, { 0x14,0x7f,0x7f,0x14,0x7f,0x7f,0x14,0x00 }, { 0x24,0x2e,0x6b,0x6b,0x3a,0x12,0x00,0x00 }, { 0x46,0x66,0x30,0x18,0x0c,0x66,0x62,0x00 }, { 0x30,0x7a,0x4f,0x5d,0x37,0x7a,0x48,0x00 }, { 0x04,0x07,0x03,0x00,0x00,0x00,0x00,0x00 }, { 0x00,0x1c,0x3e,0x63,0x41,0x00,0x00,0x00 }, { 0x00,0x41,0x63,0x3e,0x1c,0x00,0x00,0x00 }, { 0x08,0x2a,0x3e,0x1c,0x1c,0x3e,0x2a,0x08 }, { 0x08,0x08,0x3e,0x3e,0x08,0x08,0x00,0x00 }, { 0x00,0xa0,0xe0,0x60,0x00,0x00,0x00,0x00 }, { 0x08,0x08,0x08,0x08,0x08,0x08,0x00,0x00 }, { 0x00,0x00,0x60,0x60,0x00,0x00,0x00,0x00 }, { 0x60,0x30,0x18,0x0c,0x06,0x03,0x01,0x00 }, { 0x3e,0x7f,0x59,0x4d,0x7f,0x3e,0x00,0x00 }, { 0x42,0x42,0x7f,0x7f,0x40,0x40,0x00,0x00 }, { 0x62,0x73,0x59,0x49,0x6f,0x66,0x00,0x00 }, { 0x22,0x63,0x49,0x49,0x7f,0x36,0x00,0x00 }, { 0x18,0x1c,0x16,0x13,0x7f,0x7f,0x10,0x00 }, { 0x27,0x67,0x45,0x45,0x7d,0x39,0x00,0x00 }, { 0x3c,0x7e,0x4b,0x49,0x79,0x30,0x00,0x00 }, { 0x03,0x63,0x71,0x19,0x0f,0x07,0x00,0x00 }, { 0x36,0x7f,0x49,0x49,0x7f,0x36,0x00,0x00 }, { 0x06,0x4f,0x49,0x69,0x3f,0x1e,0x00,0x00 }, { 0x00,0x00,0x6c,0x6c,0x00,0x00,0x00,0x00 }, { 0x00,0xa0,0xec,0x6c,0x00,0x00,0x00,0x00 }, { 0x08,0x1c,0x36,0x63,0x41,0x00,0x00,0x00 }, { 0x14,0x14,0x14,0x14,0x14,0x14,0x00,0x00 }, { 0x00,0x41,0x63,0x36,0x1c,0x08,0x00,0x00 }, { 0x02,0x03,0x51,0x59,0x0f,0x06,0x00,0x00 }, { 0x3e,0x7f,0x41,0x5d,0x5d,0x1f,0x1e,0x00 }, { 0x7c,0x7e,0x13,0x13,0x7e,0x7c,0x00,0x00 }, { 0x41,0x7f,0x7f,0x49,0x49,0x7f,0x36,0x00 }, { 0x1c,0x3e,0x63,0x41,0x41,0x63,0x22,0x00 }, { 0x41,0x7f,0x7f,0x41,0x63,0x7f,0x1c,0x00 }, { 0x41,0x7f,0x7f,0x49,0x5d,0x41,0x63,0x00 }, { 0x41,0x7f,0x7f,0x49,0x1d,0x01,0x03,0x00 }, { 0x1c,0x3e,0x63,0x41,0x51,0x73,0x72,0x00 }, { 0x7f,0x7f,0x08,0x08,0x7f,0x7f,0x00,0x00 }, { 0x00,0x41,0x7f,0x7f,0x41,0x00,0x00,0x00 }, { 0x30,0x70,0x40,0x41,0x7f,0x3f,0x01,0x00 }, { 0x41,0x7f,0x7f,0x08,0x1c,0x77,0x63,0x00 }, { 0x41,0x7f,0x7f,0x41,0x40,0x60,0x70,0x00 }, { 0x7f,0x7f,0x06,0x0c,0x06,0x7f,0x7f,0x00 }, { 0x7f,0x7f,0x06,0x0c,0x18,0x7f,0x7f,0x00 }, { 0x1c,0x3e,0x63,0x41,0x63,0x3e,0x1c,0x00 }, { 0x41,0x7f,0x7f,0x49,0x09,0x0f,0x06,0x00 }, { 0x1e,0x3f,0x21,0x71,0x7f,0x5e,0x00,0x00 }, { 0x41,0x7f,0x7f,0x19,0x39,0x6f,0x46,0x00 }, { 0x26,0x67,0x4d,0x59,0x7b,0x32,0x00,0x00 }, { 0x03,0x41,0x7f,0x7f,0x41,0x03,0x00,0x00 }, { 0x7f,0x7f,0x40,0x40,0x7f,0x7f,0x00,0x00 }, { 0x1f,0x3f,0x60,0x60,0x3f,0x1f,0x00,0x00 }, { 0x7f,0x7f,0x30,0x18,0x30,0x7f,0x7f,0x00 }, { 0x63,0x77,0x1c,0x08,0x1c,0x77,0x63,0x00 }, { 0x07,0x4f,0x78,0x78,0x4f,0x07,0x00,0x00 }, { 0x67,0x73,0x59,0x4d,0x47,0x63,0x71,0x00 }, { 0x00,0x7f,0x7f,0x41,0x41,0x00,0x00,0x00 }, { 0x01,0x03,0x06,0x0c,0x18,0x30,0x60,0x00 }, { 0x00,0x41,0x41,0x7f,0x7f,0x00,0x00,0x00 }, { 0x08,0x0c,0x06,0x03,0x06,0x0c,0x08,0x00 }, { 0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80 }, { 0x00,0x00,0x03,0x07,0x04,0x00,0x00,0x00 }, { 0x20,0x74,0x54,0x54,0x3c,0x78,0x40,0x00 }, { 0x41,0x3f,0x7f,0x44,0x44,0x7c,0x38,0x00 }, { 0x38,0x7c,0x44,0x44,0x6c,0x28,0x00,0x00 }, { 0x30,0x78,0x48,0x49,0x3f,0x7f,0x40,0x00 }, { 0x38,0x7c,0x54,0x54,0x5c,0x18,0x00,0x00 }, { 0x48,0x7e,0x7f,0x49,0x03,0x02,0x00,0x00 }, { 0x98,0xbc,0xa4,0xa4,0xf8,0x7c,0x04,0x00 }, { 0x41,0x7f,0x7f,0x08,0x04,0x7c,0x78,0x00 }, { 0x00,0x44,0x7d,0x7d,0x40,0x00,0x00,0x00 }, { 0x40,0xc4,0x84,0xfd,0x7d,0x00,0x00,0x00 }, { 0x41,0x7f,0x7f,0x10,0x38,0x6c,0x44,0x00 }, { 0x00,0x41,0x7f,0x7f,0x40,0x00,0x00,0x00 }, { 0x7c,0x7c,0x0c,0x18,0x0c,0x7c,0x78,0x00 }, { 0x7c,0x7c,0x04,0x04,0x7c,0x78,0x00,0x00 }, { 0x38,0x7c,0x44,0x44,0x7c,0x38,0x00,0x00 }, { 0x84,0xfc,0xf8,0xa4,0x24,0x3c,0x18,0x00 }, { 0x18,0x3c,0x24,0xa4,0xf8,0xfc,0x84,0x00 }, { 0x44,0x7c,0x78,0x44,0x1c,0x18,0x00,0x00 }, { 0x48,0x5c,0x54,0x54,0x74,0x24,0x00,0x00 }, { 0x00,0x04,0x3e,0x7f,0x44,0x24,0x00,0x00 }, { 0x3c,0x7c,0x40,0x40,0x3c,0x7c,0x40,0x00 }, { 0x1c,0x3c,0x60,0x60,0x3c,0x1c,0x00,0x00 }, { 0x3c,0x7c,0x60,0x30,0x60,0x7c,0x3c,0x00 }, { 0x44,0x6c,0x38,0x10,0x38,0x6c,0x44,0x00 }, { 0x9c,0xbc,0xa0,0xa0,0xfc,0x7c,0x00,0x00 }, { 0x4c,0x64,0x74,0x5c,0x4c,0x64,0x00,0x00 }, { 0x08,0x08,0x3e,0x77,0x41,0x41,0x00,0x00 }, { 0x00,0x00,0x00,0x77,0x77,0x00,0x00,0x00 }, { 0x41,0x41,0x77,0x3e,0x08,0x08,0x00,0x00 }, { 0x02,0x03,0x01,0x03,0x02,0x03,0x01,0x00 }, { 0x78,0x7c,0x46,0x43,0x46,0x7c,0x78,0x00 }, { 0x0e,0x9f,0x91,0xb1,0xfb,0x4a,0x00,0x00 }, { 0x3a,0x7a,0x40,0x40,0x7a,0x7a,0x40,0x00 }, { 0x38,0x7c,0x54,0x55,0x5d,0x19,0x00,0x00 }, { 0x02,0x23,0x75,0x55,0x55,0x7d,0x7b,0x42 }, { 0x21,0x75,0x54,0x54,0x7d,0x79,0x40,0x00 }, { 0x21,0x75,0x55,0x54,0x7c,0x78,0x40,0x00 }, { 0x20,0x74,0x57,0x57,0x7c,0x78,0x40,0x00 }, { 0x18,0x3c,0xa4,0xa4,0xa4,0xe4,0x40,0x00 }, { 0x02,0x3b,0x7d,0x55,0x55,0x5d,0x1b,0x02 }, { 0x39,0x7d,0x54,0x54,0x5d,0x19,0x00,0x00 }, { 0x39,0x7d,0x55,0x54,0x5c,0x18,0x00,0x00 }, { 0x01,0x45,0x7c,0x7c,0x41,0x01,0x00,0x00 }, { 0x02,0x03,0x45,0x7d,0x7d,0x43,0x02,0x00 }, { 0x01,0x45,0x7d,0x7c,0x40,0x00,0x00,0x00 }, { 0x79,0x7d,0x26,0x26,0x7d,0x79,0x00,0x00 }, { 0x70,0x78,0x2b,0x2b,0x78,0x70,0x00,0x00 }, { 0x44,0x7c,0x7c,0x55,0x55,0x45,0x00,0x00 }, { 0x20,0x74,0x54,0x54,0x7c,0x7c,0x54,0x54 }, { 0x7c,0x7e,0x0b,0x09,0x7f,0x7f,0x49,0x00 }, { 0x32,0x7b,0x49,0x49,0x7b,0x32,0x00,0x00 }, { 0x32,0x7a,0x48,0x48,0x7a,0x32,0x00,0x00 }, { 0x32,0x7a,0x4a,0x48,0x78,0x30,0x00,0x00 }, { 0x3a,0x7b,0x41,0x41,0x7b,0x7a,0x40,0x00 }, { 0x3a,0x7a,0x42,0x40,0x78,0x78,0x40,0x00 }, { 0xba,0xba,0xa0,0xa0,0xfa,0x7a,0x00,0x00 }, { 0x19,0x3d,0x66,0x66,0x66,0x3d,0x19,0x00 }, { 0x3d,0x7d,0x40,0x40,0x7d,0x3d,0x00,0x00 }, { 0x18,0x3c,0x24,0xe7,0xe7,0x24,0x24,0x00 }, { 0x68,0x7e,0x7f,0x49,0x43,0x66,0x20,0x00 }, { 0x2b,0x2f,0x7c,0x7c,0x2f,0x2b,0x00,0x00 }, { 0x7f,0x7f,0x09,0x2f,0xf6,0xf8,0xa0,0x00 }, { 0x40,0xc8,0x88,0xfe,0x7f,0x09,0x0b,0x02 }, { 0x20,0x74,0x54,0x55,0x7d,0x79,0x40,0x00 }, { 0x00,0x44,0x7d,0x7d,0x41,0x00,0x00,0x00 }, { 0x30,0x78,0x48,0x4a,0x7a,0x32,0x00,0x00 }, { 0x38,0x78,0x40,0x42,0x7a,0x7a,0x40,0x00 }, { 0x7a,0x7a,0x0a,0x0a,0x7a,0x70,0x00,0x00 }, { 0x7d,0x7d,0x19,0x31,0x7d,0x7d,0x00,0x00 }, { 0x00,0x26,0x2f,0x29,0x2f,0x2f,0x28,0x00 }, { 0x00,0x26,0x2f,0x29,0x29,0x2f,0x26,0x00 }, { 0x30,0x78,0x4d,0x45,0x60,0x20,0x00,0x00 }, { 0x38,0x38,0x08,0x08,0x08,0x08,0x00,0x00 }, { 0x08,0x08,0x08,0x08,0x38,0x38,0x00,0x00 }, { 0x67,0x37,0x18,0xcc,0xee,0xab,0xb9,0x90 }, { 0x6f,0x3f,0x18,0x4c,0x66,0x73,0xf9,0xf8 }, { 0x00,0x00,0x60,0xfa,0xfa,0x60,0x00,0x00 }, { 0x08,0x1c,0x36,0x22,0x08,0x1c,0x36,0x22 }, { 0x22,0x36,0x1c,0x08,0x22,0x36,0x1c,0x08 }, { 0xaa,0x00,0x55,0x00,0xaa,0x00,0x55,0x00 }, { 0xaa,0x55,0xaa,0x55,0xaa,0x55,0xaa,0x55 }, { 0x55,0xff,0xaa,0xff,0x55,0xff,0xaa,0xff }, { 0x00,0x00,0x00,0xff,0xff,0x00,0x00,0x00 }, { 0x10,0x10,0x10,0xff,0xff,0x00,0x00,0x00 }, { 0x14,0x14,0x14,0xff,0xff,0x00,0x00,0x00 }, { 0x10,0x10,0xff,0xff,0x00,0xff,0xff,0x00 }, { 0x10,0x10,0xf0,0xf0,0x10,0xf0,0xf0,0x00 }, { 0x14,0x14,0x14,0xfc,0xfc,0x00,0x00,0x00 }, { 0x14,0x14,0xf7,0xf7,0x00,0xff,0xff,0x00 }, { 0x00,0x00,0xff,0xff,0x00,0xff,0xff,0x00 }, { 0x14,0x14,0xf4,0xf4,0x04,0xfc,0xfc,0x00 }, { 0x14,0x14,0x17,0x17,0x10,0x1f,0x1f,0x00 }, { 0x10,0x10,0x1f,0x1f,0x10,0x1f,0x1f,0x00 }, { 0x14,0x14,0x14,0x1f,0x1f,0x00,0x00,0x00 }, { 0x10,0x10,0x10,0xf0,0xf0,0x00,0x00,0x00 }, { 0x00,0x00,0x00,0x1f,0x1f,0x10,0x10,0x10 }, { 0x10,0x10,0x10,0x1f,0x1f,0x10,0x10,0x10 }, { 0x10,0x10,0x10,0xf0,0xf0,0x10,0x10,0x10 }, { 0x00,0x00,0x00,0xff,0xff,0x10,0x10,0x10 }, { 0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10 }, { 0x10,0x10,0x10,0xff,0xff,0x10,0x10,0x10 }, { 0x00,0x00,0x00,0xff,0xff,0x14,0x14,0x14 }, { 0x00,0x00,0xff,0xff,0x00,0xff,0xff,0x10 }, { 0x00,0x00,0x1f,0x1f,0x10,0x17,0x17,0x14 }, { 0x00,0x00,0xfc,0xfc,0x04,0xf4,0xf4,0x14 }, { 0x14,0x14,0x17,0x17,0x10,0x17,0x17,0x14 }, { 0x14,0x14,0xf4,0xf4,0x04,0xf4,0xf4,0x14 }, { 0x00,0x00,0xff,0xff,0x00,0xf7,0xf7,0x14 }, { 0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14 }, { 0x14,0x14,0xf7,0xf7,0x00,0xf7,0xf7,0x14 }, { 0x14,0x14,0x14,0x17,0x17,0x14,0x14,0x14 }, { 0x10,0x10,0x1f,0x1f,0x10,0x1f,0x1f,0x10 }, { 0x14,0x14,0x14,0xf4,0xf4,0x14,0x14,0x14 }, { 0x10,0x10,0xf0,0xf0,0x10,0xf0,0xf0,0x10 }, { 0x00,0x00,0x1f,0x1f,0x10,0x1f,0x1f,0x10 }, { 0x00,0x00,0x00,0x1f,0x1f,0x14,0x14,0x14 }, { 0x00,0x00,0x00,0xfc,0xfc,0x14,0x14,0x14 }, { 0x00,0x00,0xf0,0xf0,0x10,0xf0,0xf0,0x10 }, { 0x10,0x10,0xff,0xff,0x00,0xff,0xff,0x10 }, { 0x14,0x14,0x14,0xf7,0xf7,0x14,0x14,0x14 }, { 0x10,0x10,0x10,0x1f,0x1f,0x00,0x00,0x00 }, { 0x00,0x00,0x00,0xf0,0xf0,0x10,0x10,0x10 }, { 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff }, { 0xf0,0xf0,0xf0,0xf0,0xf0,0xf0,0xf0,0xf0 }, { 0xff,0xff,0xff,0xff,0x00,0x00,0x00,0x00 }, { 0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff }, { 0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f }, { 0x38,0x7c,0x44,0x6c,0x38,0x6c,0x44,0x00 }, { 0xfc,0xfe,0x2a,0x2a,0x3e,0x14,0x00,0x00 }, { 0x7e,0x7e,0x02,0x02,0x02,0x06,0x06,0x00 }, { 0x02,0x7e,0x7e,0x02,0x7e,0x7e,0x02,0x00 }, { 0x41,0x63,0x77,0x5d,0x49,0x63,0x63,0x00 }, { 0x38,0x7c,0x44,0x44,0x7c,0x3c,0x04,0x00 }, { 0x80,0xfe,0x7e,0x20,0x20,0x3e,0x1e,0x00 }, { 0x04,0x06,0x02,0x7e,0x7c,0x06,0x02,0x00 }, { 0x99,0xbd,0xe7,0xe7,0xbd,0x99,0x00,0x00 }, { 0x1c,0x3e,0x6b,0x49,0x6b,0x3e,0x1c,0x00 }, { 0x4c,0x7e,0x73,0x01,0x73,0x7e,0x4c,0x00 }, { 0x30,0x78,0x4a,0x4f,0x7d,0x39,0x00,0x00 }, { 0x18,0x3c,0x24,0x3c,0x3c,0x24,0x3c,0x18 }, { 0x98,0xfc,0x64,0x3c,0x3e,0x27,0x3d,0x18 }, { 0x1c,0x3e,0x6b,0x49,0x49,0x49,0x00,0x00 }, { 0x7e,0x7f,0x01,0x01,0x7f,0x7e,0x00,0x00 }, { 0x2a,0x2a,0x2a,0x2a,0x2a,0x2a,0x00,0x00 }, { 0x44,0x44,0x5f,0x5f,0x44,0x44,0x00,0x00 }, { 0x40,0x51,0x5b,0x4e,0x44,0x40,0x00,0x00 }, { 0x40,0x44,0x4e,0x5b,0x51,0x40,0x00,0x00 }, { 0x00,0x00,0x00,0xfe,0xff,0x01,0x07,0x06 }, { 0x60,0xe0,0x80,0xff,0x7f,0x00,0x00,0x00 }, { 0x08,0x08,0x6b,0x6b,0x08,0x08,0x00,0x00 }, { 0x24,0x12,0x12,0x36,0x24,0x24,0x12,0x00 }, { 0x00,0x06,0x0f,0x09,0x0f,0x06,0x00,0x00 }, { 0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00 }, { 0x00,0x00,0x00,0x10,0x10,0x00,0x00,0x00 }, { 0x10,0x30,0x70,0xc0,0xff,0xff,0x01,0x01 }, { 0x00,0x1f,0x1f,0x01,0x1f,0x1e,0x00,0x00 }, { 0x00,0x19,0x1d,0x15,0x17,0x12,0x00,0x00 }, { 0x00,0x00,0x3c,0x3c,0x3c,0x3c,0x00,0x00 }, { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }
|
|
};
|
|
|
|
const char BOX_CHARS[8] = { 218, 191, 192, 217, 196, 196, 179, 179 };
|
|
|
|
void draw_box(byte x, byte y, byte x2, byte y2, const char* chars) {
|
|
byte x1 = x;
|
|
putchar(x, y, chars[2]);
|
|
putchar(x2, y, chars[3]);
|
|
putchar(x, y2, chars[0]);
|
|
putchar(x2, y2, chars[1]);
|
|
while (++x < x2) {
|
|
putchar(x, y, chars[5]);
|
|
putchar(x, y2, chars[4]);
|
|
}
|
|
while (++y < y2) {
|
|
putchar(x1, y, chars[6]);
|
|
putchar(x2, y, chars[7]);
|
|
}
|
|
}
|
|
|
|
void draw_playfield() {
|
|
draw_box(0,0,27,29,BOX_CHARS);
|
|
putstring(0,31,"PLAYER 1");
|
|
putstring(20,31,"PLAYER 2");
|
|
putstring(0,30,"SCORE:");
|
|
putstring(20,30,"SCORE:");
|
|
putchar(7,30,CHAR(players[0].score + '0'));
|
|
putchar(27,30,CHAR(players[1].score + '0'));
|
|
if (attract) {
|
|
if (credits) {
|
|
putstring(8,29,"PRESS START");
|
|
putstring(9,0,"CREDITS ");
|
|
putchar(9+8, 0, (credits>9?9:credits)+CHAR('0'));
|
|
} else {
|
|
putstring(9,29,"GAME OVER");
|
|
putstring(8,0,"INSERT COIN");
|
|
}
|
|
}
|
|
}
|
|
|
|
typedef enum { D_RIGHT, D_DOWN, D_LEFT, D_UP } dir_t;
|
|
const char DIR_X[4] = { 1, 0, -1, 0 };
|
|
const char DIR_Y[4] = { 0, -1, 0, 1 };
|
|
|
|
void init_game() {
|
|
memset(players, 0, sizeof(players));
|
|
players[0].head_attr = CHAR('1');
|
|
players[1].head_attr = CHAR('2');
|
|
players[0].tail_attr = 254;
|
|
players[1].tail_attr = 254;
|
|
frames_per_move = START_SPEED;
|
|
}
|
|
|
|
void reset_players() {
|
|
players[0].x = players[0].y = 6;
|
|
players[0].dir = D_RIGHT;
|
|
players[1].x = players[1].y = 21;
|
|
players[1].dir = D_LEFT;
|
|
players[0].collided = players[1].collided = 0;
|
|
}
|
|
|
|
void draw_player(Player* p) {
|
|
putchar(p->x, p->y, p->head_attr);
|
|
}
|
|
|
|
void move_player(Player* p) {
|
|
putchar(p->x, p->y, p->tail_attr);
|
|
p->x += DIR_X[p->dir];
|
|
p->y += DIR_Y[p->dir];
|
|
if (getchar(p->x, p->y) != CHAR(' '))
|
|
p->collided = 1;
|
|
draw_player(p);
|
|
}
|
|
|
|
void human_control(Player* p) {
|
|
byte dir = 0xff;
|
|
if (!p->human) return;
|
|
if (LEFT1) dir = D_LEFT;
|
|
if (RIGHT1) dir = D_RIGHT;
|
|
if (UP1) dir = D_UP;
|
|
if (DOWN1) dir = D_DOWN;
|
|
// don't let the player reverse
|
|
if (dir < 0x80 && dir != (p->dir ^ 2)) {
|
|
p->dir = dir;
|
|
}
|
|
}
|
|
|
|
byte ai_try_dir(Player* p, dir_t dir, byte shift) {
|
|
byte x,y;
|
|
dir &= 3;
|
|
x = p->x + (DIR_X[dir] << shift);
|
|
y = p->y + (DIR_Y[dir] << shift);
|
|
if (x < 29 && y < 27 && getchar(x, y) == CHAR(' ')) {
|
|
p->dir = dir;
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void ai_control(Player* p) {
|
|
dir_t dir;
|
|
if (p->human) return;
|
|
dir = p->dir;
|
|
if (!ai_try_dir(p, dir, 0)) {
|
|
ai_try_dir(p, dir+1, 0);
|
|
ai_try_dir(p, dir-1, 0);
|
|
} else {
|
|
ai_try_dir(p, dir-1, 0) && ai_try_dir(p, dir-1, 1+(rand() & 3));
|
|
ai_try_dir(p, dir+1, 0) && ai_try_dir(p, dir+1, 1+(rand() & 3));
|
|
ai_try_dir(p, dir, rand() & 3);
|
|
}
|
|
}
|
|
|
|
void slide_right() {
|
|
byte j;
|
|
for (j=0; j<32; j++) {
|
|
memmove(&cellram[1], &cellram[0], sizeof(cellram)-sizeof(cellram[0]));
|
|
memset(&cellram[0], 0, sizeof(cellram[0]));
|
|
}
|
|
}
|
|
|
|
void flash_colliders() {
|
|
byte i;
|
|
// flash players that collided
|
|
for (i=0; i<60; i++) {
|
|
if (players[0].collided) players[0].head_attr ^= 0x80;
|
|
if (players[1].collided) players[1].head_attr ^= 0x80;
|
|
delay(5);
|
|
draw_player(&players[0]);
|
|
draw_player(&players[1]);
|
|
palette = i;
|
|
set8910(7, 0xff ^ 0x8);
|
|
set8910(6, i>>1);
|
|
set8910(8, 10);
|
|
}
|
|
set8910(8, 0);
|
|
palette = 0;
|
|
}
|
|
|
|
void make_move() {
|
|
byte i;
|
|
for (i=0; i<frames_per_move; i++) {
|
|
human_control(&players[0]);
|
|
delay(10);
|
|
}
|
|
ai_control(&players[0]);
|
|
ai_control(&players[1]);
|
|
// if players collide, 2nd player gets the point
|
|
move_player(&players[1]);
|
|
move_player(&players[0]);
|
|
}
|
|
|
|
void play_game();
|
|
|
|
char start_pressed() {
|
|
if (attract) {
|
|
if (credits > 0 && START1) {
|
|
credits--;
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void declare_winner(byte winner) {
|
|
byte i;
|
|
for (i=0; i<10; i++) {
|
|
draw_box(i,i,27-i,29-i,BOX_CHARS);
|
|
delay(10);
|
|
}
|
|
putstring(10,16,"WINNER:");
|
|
putstring(10,13,"PLAYER ");
|
|
putchar(10+7, 13, CHAR('1')+winner);
|
|
delay(250);
|
|
slide_right();
|
|
attract = 1;
|
|
}
|
|
|
|
void play_round() {
|
|
reset_players();
|
|
clrscr();
|
|
draw_playfield();
|
|
while (1) {
|
|
make_move();
|
|
if (players[0].collided || players[1].collided) break;
|
|
if (start_pressed()) {
|
|
play_game();
|
|
return;
|
|
}
|
|
}
|
|
flash_colliders();
|
|
// don't keep score in attract mode
|
|
if (attract) return;
|
|
// add scores to players that didn't collide
|
|
if (players[0].collided) players[1].score++;
|
|
if (players[1].collided) players[0].score++;
|
|
// increase speed
|
|
if (frames_per_move > MAX_SPEED) frames_per_move--;
|
|
// game over?
|
|
if (players[0].score != players[1].score) {
|
|
if (players[0].score >= MAX_SCORE)
|
|
declare_winner(0);
|
|
else if (players[1].score >= MAX_SCORE)
|
|
declare_winner(1);
|
|
}
|
|
}
|
|
|
|
void play_game() {
|
|
attract = 0;
|
|
init_game();
|
|
players[0].human = 1;
|
|
while (!attract) {
|
|
play_round();
|
|
}
|
|
}
|
|
|
|
void attract_mode() {
|
|
attract = 1;
|
|
init_game();
|
|
frames_per_move = 9;
|
|
players[0].human = 0;
|
|
while (1) {
|
|
play_round();
|
|
}
|
|
}
|
|
|
|
void test_ram() {
|
|
word i;
|
|
for (i=0; i<0x800; i++) {
|
|
cellram[0][i & 0x3ff] = rand();
|
|
}
|
|
}
|
|
|
|
void main() {
|
|
assert_coin_status = 1;
|
|
if (COIN1) {
|
|
credits++;
|
|
} else {
|
|
test_ram();
|
|
}
|
|
palette = 0;
|
|
memcpy(tileram, font8x8, sizeof(font8x8));
|
|
draw_playfield();
|
|
attract_mode();
|
|
}
|