mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-12-27 14:29:39 +00:00
557 lines
14 KiB
C
557 lines
14 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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volatile __sfr __at (0x0) input0;
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volatile __sfr __at (0x1) input1;
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volatile __sfr __at (0x2) input2;
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__sfr __at (0x2) bitshift_offset;
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volatile __sfr __at (0x3) bitshift_read;
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__sfr __at (0x4) bitshift_value;
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__sfr __at (0x6) watchdog_strobe;
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byte __at (0x2400) vidmem[224][32]; // 256x224x1 video memory
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#define FIRE1 (input1 & 0x10)
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#define LEFT1 (input1 & 0x20)
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#define RIGHT1 (input1 & 0x40)
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#define COIN1 (input1 & 0x1)
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#define START1 (input1 & 0x4)
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#define START2 (input1 & 0x2)
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void scanline96() __interrupt;
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void scanline224() __interrupt;
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void main();
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// start routine @ 0x0
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// set stack pointer, enable interrupts
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void start() __naked {
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__asm
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LD SP,#0x2400
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EI
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NOP
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JP _main
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__endasm;
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}
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// scanline 96 interrupt @ 0x8
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// we don't have enough bytes to make this an interrupt
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// because the next routine is at 0x10
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void _RST_8() __naked {
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__asm
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NOP
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NOP
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NOP
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NOP
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NOP
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JP _scanline96
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__endasm;
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}
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// scanline 224 interrupt @ 0x10
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// this one, we make an interrupt so it saves regs.
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void scanline224() __interrupt {
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vidmem[2]++;
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}
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// scanline 96 function, saves regs
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void scanline96() __interrupt {
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vidmem[0]++;
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}
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/// GRAPHICS FUNCTIONS
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void clrscr() {
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memset(vidmem, 0, sizeof(vidmem));
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}
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inline void xor_pixel(byte x, byte y) {
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byte* dest = &vidmem[x][y>>3];
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*dest ^= 0x1 << (y&7);
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}
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void draw_vline(byte x, byte y1, byte y2) {
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byte yb1 = y1/8;
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byte yb2 = y2/8;
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byte* dest = &vidmem[x][yb1];
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signed char nbytes = yb2 - yb1;
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*dest++ ^= 0xff << (y1&7);
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if (nbytes > 0) {
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while (--nbytes > 0) {
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*dest++ ^= 0xff;
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}
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*dest ^= 0xff >> (~y2&7);
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} else {
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*--dest ^= 0xff << ((y2+1)&7);
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}
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}
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#define LOCHAR 0x20
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#define HICHAR 0x5e
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const byte font8x8[HICHAR-LOCHAR+1][8] = {/*{w:8,h:8,bpp:1,count:63,xform:"rotate(-90deg)"}*/
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{ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, { 0x00,0x00,0x00,0x79,0x79,0x00,0x00,0x00 }, { 0x00,0x70,0x70,0x00,0x00,0x70,0x70,0x00 }, { 0x14,0x7f,0x7f,0x14,0x14,0x7f,0x7f,0x14 }, { 0x00,0x12,0x3a,0x6b,0x6b,0x2e,0x24,0x00 }, { 0x00,0x63,0x66,0x0c,0x18,0x33,0x63,0x00 }, { 0x00,0x26,0x7f,0x59,0x59,0x77,0x27,0x05 }, { 0x00,0x00,0x00,0x10,0x30,0x60,0x40,0x00 }, { 0x00,0x00,0x1c,0x3e,0x63,0x41,0x00,0x00 }, { 0x00,0x00,0x41,0x63,0x3e,0x1c,0x00,0x00 }, { 0x08,0x2a,0x3e,0x1c,0x1c,0x3e,0x2a,0x08 }, { 0x00,0x08,0x08,0x3e,0x3e,0x08,0x08,0x00 }, { 0x00,0x00,0x00,0x03,0x03,0x00,0x00,0x00 }, { 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00 }, { 0x00,0x00,0x00,0x03,0x03,0x00,0x00,0x00 }, { 0x00,0x01,0x03,0x06,0x0c,0x18,0x30,0x20 }, { 0x00,0x3e,0x7f,0x49,0x51,0x7f,0x3e,0x00 }, { 0x00,0x01,0x11,0x7f,0x7f,0x01,0x01,0x00 }, { 0x00,0x23,0x67,0x45,0x49,0x79,0x31,0x00 }, { 0x00,0x22,0x63,0x49,0x49,0x7f,0x36,0x00 }, { 0x00,0x0c,0x0c,0x14,0x34,0x7f,0x7f,0x04 }, { 0x00,0x72,0x73,0x51,0x51,0x5f,0x4e,0x00 }, { 0x00,0x3e,0x7f,0x49,0x49,0x6f,0x26,0x00 }, { 0x00,0x60,0x60,0x4f,0x5f,0x70,0x60,0x00 }, { 0x00,0x36,0x7f,0x49,0x49,0x7f,0x36,0x00 }, { 0x00,0x32,0x7b,0x49,0x49,0x7f,0x3e,0x00 }, { 0x00,0x00,0x00,0x12,0x12,0x00,0x00,0x00 }, { 0x00,0x00,0x00,0x13,0x13,0x00,0x00,0x00 }, { 0x00,0x08,0x1c,0x36,0x63,0x41,0x41,0x00 }, { 0x00,0x14,0x14,0x14,0x14,0x14,0x14,0x00 }, { 0x00,0x41,0x41,0x63,0x36,0x1c,0x08,0x00 }, { 0x00,0x20,0x60,0x45,0x4d,0x78,0x30,0x00 }, { 0x00,0x3e,0x7f,0x41,0x59,0x79,0x3a,0x00 }, { 0x00,0x1f,0x3f,0x68,0x68,0x3f,0x1f,0x00 }, { 0x00,0x7f,0x7f,0x49,0x49,0x7f,0x36,0x00 }, { 0x00,0x3e,0x7f,0x41,0x41,0x63,0x22,0x00 }, { 0x00,0x7f,0x7f,0x41,0x63,0x3e,0x1c,0x00 }, { 0x00,0x7f,0x7f,0x49,0x49,0x41,0x41,0x00 }, { 0x00,0x7f,0x7f,0x48,0x48,0x40,0x40,0x00 }, { 0x00,0x3e,0x7f,0x41,0x49,0x6f,0x2e,0x00 }, { 0x00,0x7f,0x7f,0x08,0x08,0x7f,0x7f,0x00 }, { 0x00,0x00,0x41,0x7f,0x7f,0x41,0x00,0x00 }, { 0x00,0x02,0x03,0x41,0x7f,0x7e,0x40,0x00 }, { 0x00,0x7f,0x7f,0x1c,0x36,0x63,0x41,0x00 }, { 0x00,0x7f,0x7f,0x01,0x01,0x01,0x01,0x00 }, { 0x00,0x7f,0x7f,0x30,0x18,0x30,0x7f,0x7f }, { 0x00,0x7f,0x7f,0x38,0x1c,0x7f,0x7f,0x00 }, { 0x00,0x3e,0x7f,0x41,0x41,0x7f,0x3e,0x00 }, { 0x00,0x7f,0x7f,0x48,0x48,0x78,0x30,0x00 }, { 0x00,0x3c,0x7e,0x42,0x43,0x7f,0x3d,0x00 }, { 0x00,0x7f,0x7f,0x4c,0x4e,0x7b,0x31,0x00 }, { 0x00,0x32,0x7b,0x49,0x49,0x6f,0x26,0x00 }, { 0x00,0x40,0x40,0x7f,0x7f,0x40,0x40,0x00 }, { 0x00,0x7e,0x7f,0x01,0x01,0x7f,0x7e,0x00 }, { 0x00,0x7c,0x7e,0x03,0x03,0x7e,0x7c,0x00 }, { 0x00,0x7f,0x7f,0x06,0x0c,0x06,0x7f,0x7f }, { 0x00,0x63,0x77,0x1c,0x1c,0x77,0x63,0x00 }, { 0x00,0x70,0x78,0x0f,0x0f,0x78,0x70,0x00 }, { 0x00,0x43,0x47,0x4d,0x59,0x71,0x61,0x00 }, { 0x00,0x00,0x7f,0x7f,0x41,0x41,0x00,0x00 }, { 0x00,0x20,0x30,0x18,0x0c,0x06,0x03,0x01 }, { 0x00,0x00,0x41,0x41,0x7f,0x7f,0x00,0x00 }, { 0x00,0x08,0x18,0x3f,0x3f,0x18,0x08,0x00 }
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};
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void draw_sprite(const byte* src, byte x, byte y) {
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byte i,j;
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byte* dest = &vidmem[x][y];
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byte w = *src++;
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byte h = *src++;
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for (j=0; j<h; j++) {
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for (i=0; i<w; i++) {
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*dest++ = *src++;
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}
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dest += 32-w;
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}
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}
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byte xor_sprite(const byte* src, byte x, byte y) {
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byte i,j;
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byte result = 0;
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byte* dest = &vidmem[x][y];
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byte w = *src++;
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byte h = *src++;
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for (j=0; j<h; j++) {
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for (i=0; i<w; i++) {
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result |= (*dest++ ^= *src++);
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}
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dest += 32-w;
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}
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return result;
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}
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void erase_sprite(const byte* src, byte x, byte y) {
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byte i,j;
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byte* dest = &vidmem[x][y];
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byte w = *src++;
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byte h = *src++;
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for (j=0; j<h; j++) {
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for (i=0; i<w; i++) {
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*dest++ &= ~(*src++);
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}
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dest += 32-w;
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}
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}
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void clear_sprite(const byte* src, byte x, byte y) {
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byte i,j;
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byte* dest = &vidmem[x][y];
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byte w = *src++;
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byte h = *src++;
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for (j=0; j<h; j++) {
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for (i=0; i<w; i++) {
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*dest++ = 0;
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}
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dest += 32-w;
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}
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}
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void draw_char(char ch, byte x, byte y) {
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byte i;
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const byte* src = &font8x8[(ch-LOCHAR)][0];
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byte* dest = &vidmem[x*8][y];
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for (i=0; i<8; i++) {
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*dest = *src;
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dest += 32;
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src += 1;
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}
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}
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void draw_string(const char* str, byte x, byte y) {
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do {
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byte ch = *str++;
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if (!ch) break;
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draw_char(ch, x, y);
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x++;
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} while (1);
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}
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void draw_bcd_word(word bcd, byte x, byte y) {
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byte j;
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x += 3;
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for (j=0; j<4; j++) {
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draw_char('0'+(bcd&0xf), x, y);
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x--;
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bcd >>= 4;
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}
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}
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// add two 16-bit BCD values
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word bcd_add(word a, word b) __naked {
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a; b; // to avoid warning
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__asm
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push ix
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ld ix,#0
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add ix,sp
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ld a,4 (ix)
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add a, 6 (ix)
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daa
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ld c,a
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ld a,5 (ix)
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adc a, 7 (ix)
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daa
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ld b,a
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ld l, c
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ld h, b
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pop ix
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ret
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__endasm;
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}
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//
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// GAME GRAPHICS
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//
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const byte player_bitmap[] =
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{2,27,/*{w:16,h:27,bpp:1,xform:"rotate(-90deg)"}*/0x0,0x0,0x0,0x0,0x0f,0x00,0x3e,0x00,0xf4,0x07,0xec,0x00,0x76,0x00,0x2b,0x00,0x33,0x00,0x75,0x00,0xf5,0x00,0xeb,0x31,0xbf,0xef,0x3f,0xcf,0xbf,0xef,0xeb,0x31,0xf5,0x00,0x75,0x00,0x33,0x00,0x2b,0x00,0x76,0x00,0xec,0x00,0xf4,0x07,0x3e,0x00,0x0f,0x00,0x00,0x00,0x0,0x0};
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const byte bomb_bitmap[] =
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{1,5,/*{w:8,h:5,bpp:1,xform:"rotate(-90deg)"}*/0x88,0x55,0x77,0x55,0x88};
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const byte bullet_bitmap[] =
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{2,2,/*{w:16,h:2,bpp:1,xform:"rotate(-90deg)"}*/0x88,0x88,0x44,0x44};
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const byte enemy1_bitmap[] =
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{2,17,/*{w:16,h:17,bpp:1,xform:"rotate(-90deg)"}*/0x00,0x00,0x00,0x0c,0x04,0x1e,0x46,0x3f,0xb8,0x7f,0xb0,0x7f,0xba,0x7f,0xfd,0x3f,0xfc,0x07,0xfc,0x07,0xfd,0x3f,0xba,0x7f,0xb0,0x7f,0xb8,0x7f,0x46,0x3f,0x04,0x1e,0x00,0x0c};
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const byte enemy2_bitmap[] =
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{2,16,/*{w:16,h:16,bpp:1,xform:"rotate(-90deg)"}*/0x26,0x00,0x59,0x10,0x10,0x30,0x33,0x18,0xe6,0x61,0xc4,0x56,0x03,0x03,0xdc,0x03,0xdc,0x03,0x03,0x03,0xc4,0x56,0xe6,0x61,0x33,0x18,0x10,0x30,0x59,0x10,0x26,0x00};
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const byte enemy3_bitmap[] =
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{2,16,/*{w:16,h:16,bpp:1,xform:"rotate(-90deg)"}*/0x80,0x1f,0xc0,0x03,0xf8,0x3f,0x70,0x00,0xf0,0x01,0xfc,0x07,0xe8,0x01,0xf8,0x03,0xf8,0x03,0xe8,0x01,0xf8,0x07,0xf0,0x01,0x70,0x00,0xf8,0x3f,0xc0,0x03,0x80,0x1f};
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const byte enemy4_bitmap[] =
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{2,16,/*{w:16,h:16,bpp:1,xform:"rotate(-90deg)"}*/0x06,0x00,0x0c,0x00,0x28,0x00,0x70,0x1f,0x84,0x3f,0xde,0x37,0xbb,0x3f,0xf0,0x3f,0xf0,0x3f,0xbb,0x3f,0xde,0x37,0x84,0x3f,0x70,0x1f,0x28,0x00,0x0c,0x00,0x06,0x00};
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const byte* const enemy_bitmaps[4] = {
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enemy1_bitmap,
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enemy2_bitmap,
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enemy3_bitmap,
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enemy4_bitmap
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};
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//
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// GAME CODE
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//
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byte attract;
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byte credits;
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byte curplayer;
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word score;
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byte lives;
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#define MAXLIVES 5
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byte player_x;
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byte bullet_x;
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byte bullet_y;
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byte bomb_x;
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byte bomb_y;
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typedef struct {
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byte x,y;
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const byte* shape; // need const here
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} Enemy;
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#define MAX_ENEMIES 28
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Enemy enemies[MAX_ENEMIES];
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byte enemy_index;
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byte num_enemies;
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typedef struct {
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byte right:1;
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byte down:1;
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} MarchMode;
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MarchMode this_mode, next_mode;
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void draw_lives(byte player) {
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byte i;
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byte n = lives;
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byte x = player ? (22-MAXLIVES) : 6;
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byte y = 30;
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for (i=0; i<MAXLIVES; i++) {
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draw_char(i<n?'*':' ', x++, y);
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}
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}
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void draw_score(byte player) {
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byte x = player ? 24 : 0;
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byte y = 30;
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draw_bcd_word(score, x, y);
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}
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void add_score(word pts) {
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if (attract) return;
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score = bcd_add(score, pts);
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draw_score(curplayer);
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}
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void xor_player_derez() {
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byte i,j;
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byte x = player_x+13;
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byte y = 8;
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byte* rand = 0;
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for (j=1; j<=0x1f; j++) {
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for (i=0; i<50; i++) {
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signed char xx = x + (*rand++ & 0x1f) - 15;
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signed char yy = y + (*rand++ & j);
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xor_pixel(xx, yy);
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}
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}
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}
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void destroy_player() {
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xor_player_derez(); // xor derez pattern
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xor_sprite(player_bitmap, player_x, 1); // erase ship via xor
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xor_player_derez(); // xor 2x to erase derez pattern
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player_x = 0xff;
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lives--;
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}
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void init_enemies() {
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byte i,x,y,bm;
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x=0;
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y=26;
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bm=0;
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for (i=0; i<MAX_ENEMIES; i++) {
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Enemy* e = &enemies[i];
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e->x = x;
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e->y = y;
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e->shape = enemy_bitmaps[bm];
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x += 28;
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if (x > 180) {
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x = 0;
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y -= 3;
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bm++;
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}
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}
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enemy_index = 0;
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num_enemies = MAX_ENEMIES;
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this_mode.right = 1;
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this_mode.down = 0;
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next_mode.right = 1;
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next_mode.down = 0;
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}
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void delete_enemy(Enemy* e) {
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clear_sprite(e->shape, e->x, e->y);
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memmove(e, e+1, sizeof(Enemy)*(enemies-e+MAX_ENEMIES-1));
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num_enemies--; // update_next_enemy() will check enemy_index
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}
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void update_next_enemy() {
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Enemy* e;
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if (enemy_index >= num_enemies) {
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enemy_index = 0;
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memcpy(&this_mode, &next_mode, sizeof(this_mode));
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}
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|
e = &enemies[enemy_index];
|
|
clear_sprite(e->shape, e->x, e->y);
|
|
if (this_mode.down) {
|
|
// if too close to ground, end game
|
|
if (--e->y < 5) {
|
|
destroy_player();
|
|
lives = 0;
|
|
}
|
|
next_mode.down = 0;
|
|
} else {
|
|
if (this_mode.right) {
|
|
e->x += 2;
|
|
if (e->x >= 200) {
|
|
next_mode.down = 1;
|
|
next_mode.right = 0;
|
|
}
|
|
} else {
|
|
e->x -= 2;
|
|
if (e->x == 0) {
|
|
next_mode.down = 1;
|
|
next_mode.right = 1;
|
|
}
|
|
}
|
|
}
|
|
draw_sprite(e->shape, e->x, e->y);
|
|
enemy_index++;
|
|
}
|
|
|
|
void draw_bunker(byte x, byte y, byte y2, byte h, byte w) {
|
|
byte i;
|
|
for (i=0; i<h; i++) {
|
|
draw_vline(x+i, y+i, y+y2+i*2);
|
|
draw_vline(x+h*2+w-i-1, y+i, y+y2+i*2);
|
|
}
|
|
for (i=0; i<w; i++) {
|
|
draw_vline(x+h+i, y+h, y+y2+h*2);
|
|
}
|
|
}
|
|
|
|
void draw_playfield() {
|
|
byte i;
|
|
clrscr();
|
|
draw_string("PLAYER 1", 0, 31);
|
|
draw_score(0);
|
|
draw_lives(0);
|
|
//draw_string("PLAYER 2", 20, 31);
|
|
//draw_score(1);
|
|
//draw_lives(1);
|
|
for (i=0; i<224; i++)
|
|
vidmem[i][0] = 0x7f & 0x55;
|
|
draw_bunker(30, 40, 15, 15, 20);
|
|
draw_bunker(140, 40, 15, 15, 20);
|
|
}
|
|
|
|
char in_rect(Enemy* e, byte x, byte y, byte w, byte h) {
|
|
byte eh = e->shape[0];
|
|
byte ew = e->shape[1];
|
|
return (x >= e->x-w && x <= e->x+ew && y >= e->y-h && y <= e->y+eh);
|
|
}
|
|
|
|
Enemy* find_enemy_at(byte x, byte y) {
|
|
byte i;
|
|
for (i=0; i<num_enemies; i++) {
|
|
Enemy* e = &enemies[i];
|
|
if (in_rect(e, x, y, 2, 0)) {
|
|
return e;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void check_bullet_hit(byte x, byte y) {
|
|
Enemy* e = find_enemy_at(x,y);
|
|
if (e) {
|
|
delete_enemy(e);
|
|
add_score(0x25);
|
|
}
|
|
}
|
|
|
|
void fire_bullet() {
|
|
bullet_x = player_x + 13;
|
|
bullet_y = 3;
|
|
xor_sprite(bullet_bitmap, bullet_x, bullet_y); // draw
|
|
}
|
|
|
|
void move_bullet() {
|
|
byte leftover = xor_sprite(bullet_bitmap, bullet_x, bullet_y); // erase
|
|
if (leftover || bullet_y > 26) {
|
|
clear_sprite(bullet_bitmap, bullet_x, bullet_y);
|
|
check_bullet_hit(bullet_x, bullet_y+2);
|
|
bullet_y = 0;
|
|
} else {
|
|
bullet_y++;
|
|
xor_sprite(bullet_bitmap, bullet_x, bullet_y); // draw
|
|
}
|
|
}
|
|
|
|
void drop_bomb() {
|
|
Enemy* e = &enemies[enemy_index];
|
|
bomb_x = e->x + 7;
|
|
bomb_y = e->y - 2;
|
|
xor_sprite(bomb_bitmap, bomb_x, bomb_y);
|
|
}
|
|
|
|
void move_bomb() {
|
|
byte leftover = xor_sprite(bomb_bitmap, bomb_x, bomb_y); // erase
|
|
if (bomb_y < 2) {
|
|
bomb_y = 0;
|
|
} else if (leftover) {
|
|
erase_sprite(bomb_bitmap, bomb_x, bomb_y); // erase bunker
|
|
if (bomb_y < 3) {
|
|
// player was hit (probably)
|
|
destroy_player();
|
|
}
|
|
bomb_y = 0;
|
|
} else {
|
|
bomb_y--;
|
|
xor_sprite(bomb_bitmap, bomb_x, bomb_y);
|
|
}
|
|
}
|
|
|
|
byte frame;
|
|
|
|
void move_player() {
|
|
if (attract) {
|
|
if (bullet_y == 0) fire_bullet();
|
|
} else {
|
|
if (LEFT1 && player_x>0) player_x -= 2;
|
|
if (RIGHT1 && player_x<198) player_x += 2;
|
|
if (FIRE1 && bullet_y == 0) {
|
|
fire_bullet();
|
|
}
|
|
}
|
|
draw_sprite(player_bitmap, player_x, 1);
|
|
}
|
|
|
|
void play_round() {
|
|
watchdog_strobe = 0;
|
|
draw_playfield();
|
|
player_x = 96;
|
|
bullet_y = 0;
|
|
bomb_y = 0;
|
|
frame = 0;
|
|
while (player_x != 0xff && num_enemies) {
|
|
move_player();
|
|
if (bullet_y) {
|
|
move_bullet();
|
|
}
|
|
update_next_enemy();
|
|
if (frame & 1) {
|
|
if (bomb_y == 0) {
|
|
drop_bomb();
|
|
} else {
|
|
move_bomb();
|
|
}
|
|
}
|
|
watchdog_strobe = 0;
|
|
frame++;
|
|
}
|
|
}
|
|
|
|
void init_game() {
|
|
score = 0;
|
|
lives = 5;
|
|
curplayer = 0;
|
|
}
|
|
|
|
void game_over_msg() {
|
|
byte i;
|
|
for (i=0; i<50; i++) {
|
|
draw_string(" *************** ", 5, 15);
|
|
draw_string("*** ***", 5, 16);
|
|
draw_string("** GAME OVER **", 5, 17);
|
|
draw_string("*** ***", 5, 18);
|
|
draw_string(" *************** ", 5, 19);
|
|
watchdog_strobe = 0;
|
|
}
|
|
}
|
|
|
|
void play_game() {
|
|
attract = 0;
|
|
init_game();
|
|
init_enemies();
|
|
while (lives) {
|
|
play_round();
|
|
if (num_enemies == 0) {
|
|
init_enemies();
|
|
}
|
|
}
|
|
game_over_msg();
|
|
}
|
|
|
|
void attract_mode() {
|
|
attract = 1;
|
|
while (1) {
|
|
init_enemies();
|
|
play_round();
|
|
}
|
|
}
|
|
|
|
void main() {
|
|
// NOTE: initializers don't get run, so we init here
|
|
credits = 0;
|
|
while (1) {
|
|
//attract_mode();
|
|
play_game();
|
|
}
|
|
}
|