mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-20 01:31:51 +00:00
327 lines
11 KiB
C
327 lines
11 KiB
C
|
|
#include <string.h>
|
|
|
|
typedef unsigned char byte;
|
|
typedef unsigned char word;
|
|
|
|
__sfr __at (0x0) input0;
|
|
__sfr __at (0x1) input1;
|
|
__sfr __at (0x2) input2;
|
|
__sfr __at (0x2) bitshift_offset;
|
|
__sfr __at (0x3) bitshift_read;
|
|
__sfr __at (0x4) bitshift_value;
|
|
__sfr __at (0x6) watchdog_strobe;
|
|
byte __at (0x2400) vidmem[224][32]; // 256x224x1 video memory
|
|
|
|
#define FIRE1 (input1 & 0x10)
|
|
#define LEFT1 (input1 & 0x20)
|
|
#define RIGHT1 (input1 & 0x40)
|
|
|
|
void scanline96() __interrupt;
|
|
void scanline224() __interrupt;
|
|
|
|
void main();
|
|
// start routine @ 0x0
|
|
// set stack pointer, enable interrupts
|
|
void start() {
|
|
__asm
|
|
LD SP,#0x2400
|
|
EI
|
|
NOP
|
|
__endasm;
|
|
main();
|
|
}
|
|
|
|
// scanline 96 interrupt @ 0x8
|
|
// we don't have enough bytes to make this an interrupt
|
|
// because the next routine is at 0x10
|
|
void _RST_8() {
|
|
__asm
|
|
NOP
|
|
NOP
|
|
NOP
|
|
NOP
|
|
NOP
|
|
__endasm;
|
|
scanline96();
|
|
}
|
|
|
|
// scanline 224 interrupt @ 0x10
|
|
// this one, we make an interrupt so it saves regs.
|
|
void scanline224() __interrupt {
|
|
vidmem[2]++;
|
|
}
|
|
|
|
// scanline 96 function, saves regs
|
|
void scanline96() __interrupt {
|
|
vidmem[0]++;
|
|
}
|
|
|
|
/// GRAPHICS FUNCTIONS
|
|
|
|
/*
|
|
void draw_hline(byte y, byte x1, byte x2) {
|
|
}
|
|
*/
|
|
|
|
void draw_vline(byte x, byte y1, byte y2) {
|
|
byte yb1 = y1/8;
|
|
byte yb2 = y2/8;
|
|
byte* dest = &vidmem[x][yb1];
|
|
signed char nbytes = yb2 - yb1;
|
|
*dest++ ^= 0xff << (y1&7);
|
|
if (nbytes > 0) {
|
|
while (--nbytes > 0) {
|
|
*dest++ ^= 0xff;
|
|
}
|
|
*dest ^= 0xff >> (~y2&7);
|
|
} else {
|
|
*--dest ^= 0xff << ((y2+1)&7);
|
|
}
|
|
}
|
|
|
|
#define LOCHAR 0x20
|
|
#define HICHAR 0x5e
|
|
|
|
const byte font8x8[HICHAR-LOCHAR+1][8] = {
|
|
{ 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 }
|
|
};
|
|
|
|
const byte bitmap1[] =
|
|
{6,63,0x00,0x00,0x00,0x00,0x18,0x00,0x00,0x00,0x00,0x00,0x7e,0x00,0x00,0x00,0x00,0x80,0x63,0x00,0x00,0x00,0x00,0xc0,0xc0,0x00,0x00,0x00,0x00,0x5e,0x80,0x00,0x00,0x00,0x00,0x73,0x80,0x00,0x00,0x00,0x00,0xe3,0x83,0x00,0x00,0x00,0x00,0xe3,0x9f,0x00,0x00,0x00,0x00,0xc2,0xbf,0x00,0x00,0x00,0xc0,0x03,0xff,0x00,0x00,0x00,0x70,0x06,0xfe,0x01,0x00,0x00,0x18,0x0c,0x00,0x03,0x00,0x00,0x0c,0x18,0x00,0x02,0x00,0x00,0x02,0x30,0x00,0x02,0x00,0x00,0x0f,0xe0,0x00,0x03,0x00,0xc0,0x10,0x80,0xef,0x01,0x00,0x40,0x27,0x00,0x38,0x00,0x00,0xa0,0x47,0x00,0x60,0x00,0x00,0xe0,0x4f,0xf8,0x60,0x00,0x00,0xe0,0x4f,0x0c,0xe1,0x00,0x00,0xe0,0x4f,0x06,0xe2,0x01,0x00,0xe0,0x4f,0xf2,0xe2,0x03,0xfc,0xe0,0x4f,0xfb,0xe4,0x03,0xfe,0xff,0x4f,0xf9,0xe4,0x0f,0xff,0x87,0x27,0xf9,0xe5,0x0f,0xff,0x07,0x36,0xf9,0xe5,0x1f,0xff,0x07,0x18,0xf9,0xe4,0x3f,0xff,0x07,0x00,0xfa,0xe4,0x7f,0xfe,0x07,0x00,0x72,0xe2,0x7f,0xfc,0x03,0x00,0x06,0xe2,0x7f,0xdc,0x00,0x02,0xb8,0xe1,0xff,0x08,0x00,0x04,0x60,0xe0,0xff,0x30,0x00,0x1c,0x00,0xe0,0xff,0x60,0x80,0x03,0x00,0xc0,0x7f,0xc0,0xff,0x01,0x00,0x80,0x7f,0x00,0x00,0x01,0x00,0x80,0x3f,0x00,0x00,0x01,0x00,0x00,0x0e,0x00,0x00,0x01,0x00,0x00,0x02,0x00,0x00,0x01,0x00,0x00,0x02,0x00,0x00,0x01,0x00,0x00,0x02,0x00,0x80,0x01,0x00,0x01,0x02,0x00,0x80,0x00,0x00,0x09,0x02,0x00,0xc0,0x00,0x00,0x09,0x02,0x00,0xc0,0x00,0x00,0x09,0x02,0x00,0xc0,0x00,0x00,0x09,0x02,0x00,0xc0,0x00,0x80,0x08,0x02,0x00,0xc0,0x00,0x80,0x04,0x03,0x00,0xa0,0x00,0x80,0x04,0x03,0x00,0xa0,0x01,0x40,0x04,0x01,0x00,0x20,0x02,0x70,0x82,0x01,0x00,0x70,0xf4,0x1f,0x83,0x00,0x00,0x98,0x1d,0xf8,0xc0,0x00,0x00,0x88,0x0f,0x00,0x60,0x00,0x00,0x88,0x08,0x07,0x38,0x00,0x80,0x8f,0x08,0x3f,0x0e,0x00,0x80,0x98,0x08,0xe1,0x03,0x00,0x80,0x80,0x07,0x01,0x00,0x00,0x80,0xc1,0x0c,0x01,0x00,0x00,0x00,0x83,0x90,0x01,0x00,0x00,0x00,0xfe,0x81,0x00,0x00,0x00,0x00,0x00,0x86,0x00,0x00,0x00,0x00,0x00,0xd8,0x00,0x00,0x00,0x00,0x00,0x60,0x00,0x00,0x00}
|
|
;
|
|
const byte player_bitmap[] =
|
|
{2,27,0,0,0,0,0x0f,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,0x00,0x00,0x00,0,0}
|
|
;
|
|
const byte bullet_bitmap2[] =
|
|
{4,2,0,0x88,0x88,0,0,0x44,0x44,0,}
|
|
;
|
|
const byte bullet_bitmap[] =
|
|
{2,2,0x88,0x88,0x44,0x44}
|
|
;
|
|
const byte enemy1_bitmap[] =
|
|
{2,24,0x0f,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,0x00,0x00,0x00,0,0}
|
|
;
|
|
|
|
void draw_sprite(const byte* src, byte x, byte y) {
|
|
byte i,j;
|
|
byte* dest = &vidmem[x][y];
|
|
byte w = *src++;
|
|
byte h = *src++;
|
|
for (j=0; j<h; j++) {
|
|
for (i=0; i<w; i++) {
|
|
*dest++ = *src++;
|
|
}
|
|
dest += 32-w;
|
|
}
|
|
}
|
|
|
|
byte xor_sprite(const byte* src, byte x, byte y) {
|
|
byte i,j;
|
|
byte result = 0;
|
|
byte* dest = &vidmem[x][y];
|
|
byte w = *src++;
|
|
byte h = *src++;
|
|
for (j=0; j<h; j++) {
|
|
for (i=0; i<w; i++) {
|
|
result |= (*dest++ ^= *src++);
|
|
}
|
|
dest += 32-w;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void erase_sprite(const byte* src, byte x, byte y) {
|
|
byte i,j;
|
|
byte* dest = &vidmem[x][y];
|
|
byte w = *src++;
|
|
byte h = *src++;
|
|
for (j=0; j<h; j++) {
|
|
for (i=0; i<w; i++) {
|
|
*dest++ = 0;
|
|
}
|
|
dest += 32-w;
|
|
}
|
|
}
|
|
|
|
void draw_char(char ch, byte x, byte y) {
|
|
byte i;
|
|
const byte* src = &font8x8[(ch-LOCHAR)][0];
|
|
byte* dest = &vidmem[x*8][y];
|
|
for (i=0; i<8; i++) {
|
|
*dest ^= *src;
|
|
dest += 32;
|
|
src += 1;
|
|
}
|
|
}
|
|
|
|
void draw_string(const char* str, byte x, byte y) {
|
|
do {
|
|
byte ch = *str++;
|
|
if (!ch) break;
|
|
draw_char(ch, x, y);
|
|
x++;
|
|
} while (1);
|
|
}
|
|
|
|
byte player_x;
|
|
byte bullet_x;
|
|
byte bullet_y;
|
|
|
|
#define MAX_ENTITIES 28
|
|
|
|
typedef struct {
|
|
byte x,y;
|
|
const byte* shape; // need const here
|
|
} Entity;
|
|
|
|
Entity entities[MAX_ENTITIES];
|
|
byte entity_index;
|
|
byte num_entities;
|
|
|
|
typedef struct {
|
|
byte right:1;
|
|
byte down:1;
|
|
} MarchMode;
|
|
|
|
MarchMode this_mode, next_mode;
|
|
|
|
void init_entities() {
|
|
int i,x,y;
|
|
x=0;
|
|
y=26;
|
|
for (i=0; i<MAX_ENTITIES; i++) {
|
|
Entity* e = &entities[i];
|
|
e->x = x;
|
|
e->y = y;
|
|
e->shape = enemy1_bitmap;
|
|
x += 28;
|
|
if (x > 180) {
|
|
x = 0;
|
|
y -= 3;
|
|
}
|
|
}
|
|
num_entities = MAX_ENTITIES;
|
|
this_mode.right = 1;
|
|
this_mode.down = 0;
|
|
next_mode.right = 1;
|
|
next_mode.down = 0;
|
|
}
|
|
|
|
void delete_entity(Entity* e) {
|
|
erase_sprite(e->shape, e->x, e->y);
|
|
memmove(e, e+1, sizeof(Entity)*(entities-e+MAX_ENTITIES-1));
|
|
num_entities--; // update_next_entity() will check entity_index
|
|
}
|
|
|
|
void update_next_entity() {
|
|
Entity* e;
|
|
if (entity_index >= num_entities) {
|
|
entity_index = 0;
|
|
memcpy(&this_mode, &next_mode, sizeof(this_mode));
|
|
}
|
|
e = &entities[entity_index];
|
|
erase_sprite(e->shape, e->x, e->y);
|
|
if (this_mode.down) {
|
|
e->y--;
|
|
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);
|
|
entity_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);
|
|
}
|
|
}
|
|
|
|
char in_rect(Entity* 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);
|
|
}
|
|
|
|
Entity* find_entity_at(byte x, byte y) {
|
|
byte i;
|
|
for (i=0; i<num_entities; i++) {
|
|
Entity* e = &entities[i];
|
|
if (in_rect(e, x, y, 2, 0)) {
|
|
return e;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void check_bullet_hit(byte x, byte y) {
|
|
Entity* e = find_entity_at(x,y);
|
|
if (e) {
|
|
delete_entity(e);
|
|
}
|
|
}
|
|
|
|
void gameloop() {
|
|
watchdog_strobe = 0b0111 / 14;
|
|
draw_bunker(30, 40, 15, 15, 20);
|
|
draw_bunker(120, 40, 15, 15, 20);
|
|
draw_sprite(enemy1_bitmap, 10, 20);
|
|
init_entities();
|
|
//draw_sprite(bitmap1, 0, 0);
|
|
player_x = 96;
|
|
while (1) {
|
|
if (LEFT1 && player_x>0) player_x -= 2;
|
|
if (RIGHT1 && player_x<200) player_x += 2;
|
|
if (FIRE1 && bullet_y == 0) {
|
|
bullet_x = player_x + 13;
|
|
bullet_y = 3;
|
|
xor_sprite(bullet_bitmap, bullet_x, bullet_y); // draw
|
|
}
|
|
draw_sprite(player_bitmap, player_x, 1);
|
|
draw_sprite(player_bitmap, player_x, 1);
|
|
if (bullet_y) {
|
|
byte leftover = xor_sprite(bullet_bitmap, bullet_x, bullet_y); // erase
|
|
if (leftover || bullet_y > 26) {
|
|
erase_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
|
|
}
|
|
}
|
|
update_next_entity();
|
|
watchdog_strobe = 0;
|
|
}
|
|
}
|
|
|
|
void clrscr() {
|
|
memset(vidmem, 0, sizeof(vidmem));
|
|
}
|
|
|
|
void main() {
|
|
// TODO: clear memory
|
|
clrscr();
|
|
draw_string("PLAYER 1", 0, 31);
|
|
draw_string("PLAYER 2", 20, 31);
|
|
gameloop();
|
|
}
|