mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-12-01 13:50:30 +00:00
459 lines
10 KiB
C
459 lines
10 KiB
C
|
|
//#resource "astrocade.inc"
|
|
#include "aclib.h"
|
|
//#link "aclib.s"
|
|
#include "acbios.h"
|
|
//#link "acbios.s"
|
|
#include "acfast.h"
|
|
//#link "acfast.s"
|
|
//#link "hdr_autostart.s"
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#pragma opt_code_speed
|
|
|
|
// reserve 240 bytes to expand screen RAM to 4eff
|
|
byte UNUSED[0xf0];
|
|
|
|
#define SKYH 35
|
|
#define GNDH 45
|
|
#define BOTTOM (35+45)
|
|
#define DASH_Y (BOTTOM+8)
|
|
#define PLAYER_Y (BOTTOM-67)
|
|
#define DASH_HEIGHT 16
|
|
|
|
/*{pal:"astrocade",layout:"astrocade"}*/
|
|
const byte palette[8] = {
|
|
0x07, 0xA5, 0x00, 0x03,
|
|
0xE6, 0xE5, 0xE4, 0xE3,
|
|
};
|
|
|
|
/*{pal:"astrocade",layout:"astrocade"}*/
|
|
const byte dash_palette[4] = {
|
|
0x05, 0x53, 0x86, 0x00,
|
|
};
|
|
|
|
/*{pal:"astrocade"}*/
|
|
const byte ground_colors[8] = {
|
|
0xA5, 0xA4, 0xA3, 0xA2, 0x91, 0x81, 0x80, 0x01,
|
|
};
|
|
|
|
/*{pal:"astrocade"}*/
|
|
const byte sky_colors[4*8] = {
|
|
0xE6, 0xE5, 0xE4, 0xE3,
|
|
0xE5, 0xE4, 0xF3, 0x12,
|
|
0xE4, 0xE3, 0x12, 0x22,
|
|
0xE3, 0x12, 0x22, 0x44,
|
|
0x12, 0x22, 0x44, 0x64,
|
|
0x12, 0x22, 0x20, 0xE0,
|
|
0x12, 0x22, 0xE0, 0x00,
|
|
0x11, 0xE0, 0x00, 0x00,
|
|
};
|
|
|
|
const byte CURBS[4*16] = {
|
|
/*{w:16,h:16,bpp:2,brev:1}*/
|
|
0xBF, 0xFF, 0xFF, 0xFA,
|
|
0xBF, 0xFF, 0xFF, 0xFA,
|
|
0xAF, 0xFF, 0xFF, 0xEA,
|
|
0xAF, 0xFF, 0xFF, 0xEA,
|
|
0xAB, 0xFF, 0xFF, 0xAA,
|
|
0xAB, 0xFF, 0xFF, 0xAA,
|
|
0xAA, 0xFF, 0xFE, 0xAA,
|
|
0xAA, 0xFF, 0xFE, 0xAA,
|
|
0xAA, 0xBF, 0xFA, 0xAA,
|
|
0xAA, 0xBF, 0xFA, 0xAA,
|
|
0xAA, 0xAF, 0xEA, 0xAA,
|
|
0xAA, 0xAB, 0xAA, 0xAA,
|
|
0xAA, 0xAA, 0xAA, 0xAA,
|
|
0xAA, 0xAA, 0xAA, 0xAA,
|
|
0xAA, 0xAA, 0xAA, 0xAA,
|
|
0xAA, 0xAA, 0xAA, 0xAA,
|
|
};
|
|
|
|
const byte CAR_10_MASK[2+4*10] = {
|
|
4,10,
|
|
/*{w:16,h:10,bpp:2,brev:1}*/
|
|
0x03, 0xC0, 0x03, 0xC0,
|
|
0x03, 0xFF, 0xFF, 0xC0,
|
|
0x00, 0x3F, 0xFC, 0x00,
|
|
0x00, 0xFF, 0xFF, 0x00,
|
|
0x3F, 0xFF, 0xFF, 0xFC,
|
|
0xFF, 0xFF, 0xFF, 0xFF,
|
|
0xFF, 0xFF, 0xFF, 0xFF,
|
|
0xFF, 0xFF, 0xFF, 0xFF,
|
|
0xFF, 0xFF, 0xFF, 0xFF,
|
|
0x3F, 0xC0, 0x03, 0xFC,
|
|
};
|
|
|
|
const byte CAR_10_INV[2+4*10] = {
|
|
4,10,
|
|
/*{w:16,h:10,bpp:2,brev:1}*/
|
|
0x02, 0x80, 0x02, 0x80,
|
|
0x02, 0x95, 0x56, 0x80,
|
|
0x00, 0x16, 0x94, 0x00,
|
|
0x00, 0x58, 0x25, 0x00,
|
|
0x2A, 0x51, 0x45, 0xA8,
|
|
0x82, 0x6A, 0xA9, 0x82,
|
|
0xAA, 0x96, 0x96, 0xAA,
|
|
0xAA, 0x56, 0x95, 0xAA,
|
|
0xAA, 0x7F, 0xFD, 0xAA,
|
|
0x2A, 0xC0, 0x03, 0xA8,
|
|
};
|
|
|
|
const byte CAR_10[2+4*10] = {
|
|
4,10,
|
|
/*{w:16,h:10,bpp:2,brev:1}*/
|
|
0x01, 0x40, 0x01, 0x40,
|
|
0x01, 0x6A, 0xA9, 0x40,
|
|
0x00, 0x29, 0x68, 0x00,
|
|
0x02, 0xA7, 0xDA, 0x80,
|
|
0x15, 0xAC, 0x3A, 0x54,
|
|
0x7D, 0x95, 0x56, 0x7D,
|
|
0x55, 0x69, 0x69, 0x55,
|
|
0x55, 0xA9, 0x6A, 0x55,
|
|
0x55, 0x80, 0x02, 0x55,
|
|
0x15, 0x00, 0x00, 0x54,
|
|
};
|
|
|
|
const byte CAR_9[2+4*9] = {
|
|
4,9,
|
|
/*{w:16,h:9,bpp:2,brev:1}*/
|
|
0x00, 0x50, 0x05, 0x00,
|
|
0x00, 0x5A, 0xA5, 0x00,
|
|
0x00, 0x29, 0x68, 0x00,
|
|
0x02, 0xA7, 0xDA, 0x80,
|
|
0x15, 0xAC, 0x3A, 0x54,
|
|
0x1D, 0x95, 0x56, 0x7C,
|
|
0x15, 0x69, 0x69, 0x54,
|
|
0x15, 0xA9, 0x6A, 0x54,
|
|
0x15, 0x80, 0x02, 0x54,
|
|
};
|
|
|
|
const byte CAR_8[2+4*8] = {
|
|
4,8,
|
|
/*{w:16,h:8,bpp:2,brev:1}*/
|
|
0x00, 0x14, 0x14, 0x00,
|
|
0x00, 0x1A, 0xA4, 0x00,
|
|
0x00, 0x29, 0x68, 0x00,
|
|
0x02, 0xA7, 0xDA, 0x80,
|
|
0x05, 0xA0, 0x0A, 0x50,
|
|
0x0D, 0x55, 0x55, 0x70,
|
|
0x05, 0xA9, 0x6A, 0x50,
|
|
0x05, 0x00, 0x00, 0x50,
|
|
};
|
|
|
|
const byte CAR_7[2+4*7] = {
|
|
4,7,
|
|
/*{w:16,h:7,bpp:2,brev:1}*/
|
|
0x00, 0x04, 0x10, 0x00,
|
|
0x00, 0x06, 0x90, 0x00,
|
|
0x00, 0x29, 0x68, 0x00,
|
|
0x00, 0xA7, 0xDA, 0x00,
|
|
0x03, 0x55, 0x55, 0xC0,
|
|
0x01, 0x6A, 0xA9, 0x40,
|
|
0x01, 0x40, 0x01, 0x40,
|
|
};
|
|
|
|
const byte CAR_6[2+4*6] = {
|
|
2,6,
|
|
/*{w:8,h:6,bpp:2,brev:1}*/
|
|
0x04, 0x10,
|
|
0x06, 0x90,
|
|
0x0B, 0xE0,
|
|
0x55, 0x55,
|
|
0x5A, 0xA5,
|
|
0x50, 0x05,
|
|
};
|
|
|
|
const byte CAR_5[2+4*5] = {
|
|
2,5,
|
|
/*{w:8,h:5,bpp:2,brev:1}*/
|
|
0x04, 0x10,
|
|
0x0A, 0xA0,
|
|
0x05, 0x50,
|
|
0x16, 0x94,
|
|
0x14, 0x14,
|
|
};
|
|
|
|
const byte CAR_4[2+4*4] = {
|
|
2,4,
|
|
/*{w:8,h:4,bpp:2,brev:1}*/
|
|
0x01, 0x40,
|
|
0x0A, 0xA0,
|
|
0x05, 0x50,
|
|
0x04, 0x10,
|
|
};
|
|
|
|
const byte CAR_3[2+4*3] = {
|
|
2,3,
|
|
/*{w:8,h:3,bpp:2,brev:1}*/
|
|
0x01, 0x40,
|
|
0x06, 0x90,
|
|
0x04, 0x10,
|
|
};
|
|
|
|
const byte CAR_2[2+4*2] = {
|
|
2,2,
|
|
/*{w:8,h:2,bpp:2,brev:1}*/
|
|
0x02, 0x80,
|
|
0x01, 0x40,
|
|
};
|
|
|
|
const byte* const CAR_PATTERNS[16] = {
|
|
CAR_10, CAR_10, CAR_10,
|
|
CAR_9, CAR_9, CAR_8,
|
|
CAR_7, CAR_6, CAR_5, CAR_4, CAR_3,
|
|
CAR_2, CAR_2, CAR_2, CAR_2
|
|
};
|
|
|
|
// Z-table -- y = 800/(x*0.5+16)
|
|
const byte ZTAB[128] = {
|
|
50,48,47,45,44,43,42,41,40,39,38,37,36,35,34,34,33,32,32,31,30,30,29,29,28,28,27,27,26,26,25,25,25,24,24,23,23,23,22,22,22,21,21,21,21,20,20,20,20,19,19,19,19,18,18,18,18,17,17,17,17,17,17,16,16,16,16,16,16,15,15,15,15,15,15,14,14,14,14,14,14,14,14,13,13,13,13,13,13,13,13,13,12,12,12,12,12,12,12,12,12,12,11,11,11,11,11,11,11,11,11,11,11,11,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
|
|
};
|
|
|
|
byte get1z(byte x) __z88dk_fastcall {
|
|
return (x<128) ? ZTAB[x] : (255-x)/16+2;
|
|
}
|
|
|
|
#define PAT_ROAD 0x00
|
|
#define PAT_SKY 0x55
|
|
#define PAT_GROUND 0xaa
|
|
|
|
byte road_width = 142;
|
|
byte road_cenx = 80;
|
|
int road_inc = 0;
|
|
sbyte road_curve = 0;
|
|
byte curve_dir = 1;
|
|
word track_pos = 0;
|
|
byte speed = 4;
|
|
byte fill_grass = 0;
|
|
|
|
// interrupt handler declarations
|
|
void inthandler1() __interrupt;
|
|
void inthandler2() __interrupt;
|
|
void inthandler3() __interrupt;
|
|
void inthandler4() __interrupt;
|
|
void inthandler5() __interrupt;
|
|
|
|
// pointers to the interrupt handlers
|
|
const t_interrupt_handler const intvector1 = &inthandler1;
|
|
const t_interrupt_handler const intvector2 = &inthandler2;
|
|
const t_interrupt_handler const intvector3 = &inthandler3;
|
|
const t_interrupt_handler const intvector4 = &inthandler4;
|
|
const t_interrupt_handler const intvector5 = &inthandler5;
|
|
|
|
// bottom of screen, set sky palette
|
|
// update track_pos every 1/60 sec
|
|
void inthandler1() __interrupt {
|
|
SET_RIGHT_PALETTE(_palette+4);
|
|
hw_inlin = SKYH*2 - 2;
|
|
track_pos += speed;
|
|
CHANGE_INTERRUPT_VECTOR(_intvector2);
|
|
}
|
|
// horizon, set ground palette
|
|
// next split calculated linearly
|
|
void inthandler2() __interrupt {
|
|
hw_horcb = 40;
|
|
hw_inlin = SKYH*2 + 2 + ((track_pos&0xff)>>4);
|
|
CHANGE_INTERRUPT_VECTOR(_intvector3);
|
|
}
|
|
// far split, change road color
|
|
// next split calculated with Z lookup table
|
|
void inthandler3() __interrupt {
|
|
byte y = (SKYH + ZTAB[((~track_pos&0xff)>>1)]) * 2;
|
|
hw_inlin = y > BOTTOM*2 ? BOTTOM*2 : y;
|
|
hw_col0l = 2 ^ ((track_pos>>8)&1);
|
|
CHANGE_INTERRUPT_VECTOR(_intvector4);
|
|
}
|
|
// near split, change road color until dash
|
|
void inthandler4() __interrupt {
|
|
hw_inlin = (BOTTOM+2)*2;
|
|
hw_col0l = 3 ^ ((track_pos>>8)&1);
|
|
CHANGE_INTERRUPT_VECTOR(_intvector5);
|
|
}
|
|
// set dash palette until bottom of screen
|
|
void inthandler5() __interrupt {
|
|
SET_RIGHT_PALETTE(_dash_palette);
|
|
hw_horcb = 0;
|
|
hw_inlin = 106*2;
|
|
CHANGE_INTERRUPT_VECTOR(_intvector1);
|
|
}
|
|
|
|
// get track position, preventing race condition
|
|
// if it changes during interrupt
|
|
word get_track_pos(void) {
|
|
__asm__("di");
|
|
__asm__("ld hl,(_track_pos)");
|
|
__asm__("ei");
|
|
}
|
|
|
|
// car record
|
|
typedef struct {
|
|
sbyte x;
|
|
byte y;
|
|
const byte* pattern;
|
|
} Car;
|
|
|
|
#define MAX_CARS 2
|
|
Car cars[MAX_CARS];
|
|
|
|
void draw_car(byte x1, const Car* car) {
|
|
byte x = x1 + car->x;
|
|
byte* dest = &vmagic[BOTTOM - car->y][x>>2];
|
|
hw_magic = M_SHIFT(x) | M_OR;
|
|
// is this pattern 16 pixels wide?
|
|
if (car->pattern[0] == 4) {
|
|
// special mask mode for cars near the edge
|
|
if (car->pattern == CAR_10 && (x < 40 || x > 120)) {
|
|
hw_magic = M_SHIFT(x) | M_OR;
|
|
fast_sprite_16(CAR_10_MASK, dest);
|
|
hw_magic = M_SHIFT(x) | M_XOR;
|
|
fast_sprite_16(CAR_10_INV, dest);
|
|
fill_grass = 2; // draw over grass next frame
|
|
} else {
|
|
// 16-pixel fast OR with background
|
|
fast_sprite_16(car->pattern, dest);
|
|
}
|
|
} else {
|
|
// 8-pixel fast OR with background
|
|
fast_sprite_8(car->pattern, dest);
|
|
}
|
|
}
|
|
|
|
void draw_cars(byte x1, byte y) {
|
|
if (y == cars[0].y) {
|
|
draw_car(x1, &cars[0]);
|
|
}
|
|
if (y == cars[1].y) {
|
|
draw_car(x1, &cars[1]);
|
|
}
|
|
}
|
|
|
|
void draw_grass(byte* start, byte* end) {
|
|
hw_magic = 0;
|
|
while (start < end) {
|
|
*start++ = PAT_GROUND;
|
|
}
|
|
}
|
|
|
|
void draw_road() {
|
|
byte y,x1,x2,w,j;
|
|
register byte* dest;
|
|
static byte* line;
|
|
static word xx;
|
|
static int inc;
|
|
static const byte* curb;
|
|
curb = CURBS;
|
|
line = &vmagic[BOTTOM][0];
|
|
inc = road_inc;
|
|
w = road_width;
|
|
// 16-bit X coordinate
|
|
xx = road_cenx << 8;
|
|
// loop from bottom to top
|
|
for (y=0; y<GNDH; y++) {
|
|
x1 = (xx >> 8) - w/2;
|
|
x2 = x1 + w;
|
|
// fill in grass?
|
|
if (fill_grass && y <= PLAYER_Y) {
|
|
// TODO: calc redundant expr but keeps our register var
|
|
draw_grass(line, line + x1/4);
|
|
}
|
|
// left side of road
|
|
dest = line + x1/4;
|
|
hw_magic = M_SHIFT(x1);
|
|
WASTER = PAT_GROUND; // fill shifter with ground color
|
|
*dest++ = curb[0];
|
|
*dest++ = curb[1];
|
|
// repave road, unroll loop a bit
|
|
// (causes a little flicker on the right)
|
|
for (j=0; j<w/8; j++) {
|
|
*dest++ = PAT_ROAD;
|
|
*dest++ = PAT_ROAD;
|
|
}
|
|
// right side of road
|
|
dest = line + x2/4;
|
|
hw_magic = M_SHIFT(x2);
|
|
*dest++ = curb[2];
|
|
*dest++ = curb[3];
|
|
*dest = PAT_GROUND;
|
|
// fill in grass?
|
|
if (fill_grass && y <= PLAYER_Y) {
|
|
draw_grass(dest, line+40);
|
|
}
|
|
// draw any cars which start on this line
|
|
draw_cars(xx>>8, y);
|
|
// next line up, update variables
|
|
line -= 40;
|
|
if ((y&3) == 0) curb += 4;
|
|
xx += inc;
|
|
inc += road_curve;
|
|
w -= 3;
|
|
}
|
|
if (fill_grass) fill_grass--;
|
|
}
|
|
|
|
void draw_sky() {
|
|
SYS_FILL(0x4000+0*40, 44*40, 0x00);
|
|
SYS_FILL(0x4000+25*40, 10*40, 0x55);
|
|
SYS_FILL(0x4000+30*40, 5*40, 0xaa);
|
|
SYS_FILL(0x4000+33*40, 2*40, 0xff);
|
|
}
|
|
|
|
void draw_ground() {
|
|
SYS_FILL(0x4000+35*40, 44*40, 0xaa);
|
|
}
|
|
|
|
void draw_dash() {
|
|
SYS_FILL(0x4000+80*40, 16*40, 0x00);
|
|
SYS_FILL(0x4000+80*40, 5*40, 0xff);
|
|
}
|
|
|
|
void position_cars() {
|
|
byte x,y,zr;
|
|
// player car
|
|
cars[0].x = hw_p1pot/2 - 64;
|
|
// other cars
|
|
zr = get1z((get_track_pos() & 0xff) ^ 0xff);
|
|
y = GNDH - zr;
|
|
x = zr;
|
|
cars[1].x = x;
|
|
cars[1].y = y;
|
|
cars[1].pattern = CAR_PATTERNS[y/4];
|
|
if (y < 10) cars[1].y = -1; // TODO: clipping
|
|
}
|
|
|
|
void main(void) {
|
|
// setup palette
|
|
set_palette(palette);
|
|
// set screen height
|
|
// set horizontal color split (position / 4)
|
|
// set interrupt status
|
|
set_interrupt_vector(&intvector1);
|
|
SYS_SETOUT(96*2, 0, 0x8);
|
|
// draw initial background
|
|
draw_sky();
|
|
draw_ground();
|
|
draw_dash();
|
|
// place player car
|
|
cars[0].y = PLAYER_Y;
|
|
cars[0].x = 50;
|
|
cars[0].pattern = CAR_10;
|
|
// player other car
|
|
cars[1].y = BOTTOM-60;
|
|
cars[1].x = 20;
|
|
cars[1].pattern = CAR_6;
|
|
// draw score
|
|
display_string(0, DASH_Y, XPAND_COLORS(1,0), " 00:00");
|
|
// infinite loop
|
|
while (1) {
|
|
position_cars();
|
|
draw_road();
|
|
road_curve += curve_dir;
|
|
if (road_curve >= 21) curve_dir = -1;
|
|
if (road_curve <= -20) curve_dir = 1;
|
|
if (hw_p1ctrl & JOY_UP && speed<16) speed++;
|
|
if (hw_p1ctrl & JOY_DOWN && speed>1) speed--;
|
|
}
|
|
}
|