mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-27 01:51:35 +00:00
126 lines
2.3 KiB
C
126 lines
2.3 KiB
C
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <cv.h>
|
|
#include <cvu.h>
|
|
|
|
#include "common.h"
|
|
|
|
volatile uint_fast8_t vint_counter;
|
|
|
|
void vint_handler(void) {
|
|
vint_counter++;
|
|
}
|
|
|
|
const unsigned char reverse_lookup[16] = {
|
|
0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe, 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf, };
|
|
|
|
byte reverse_bits(byte n) {
|
|
return (reverse_lookup[n&0b1111] << 4) | reverse_lookup[n>>4];
|
|
}
|
|
|
|
void flip_sprite_patterns(word dest, const byte* patterns, word len) {
|
|
word i;
|
|
for (i=0; i<len; i++) {
|
|
cvu_voutb(reverse_bits(*patterns++), dest++ ^ 16); // swap left/right chars
|
|
}
|
|
}
|
|
|
|
void clrscr() {
|
|
cvu_vmemset(IMAGE, 0, COLS*ROWS);
|
|
}
|
|
|
|
word getimageaddr(byte x, byte y) {
|
|
return IMAGE + y*COLS + x;
|
|
}
|
|
|
|
byte getchar(byte x, byte y) {
|
|
return cvu_vinb(getimageaddr(x,y));
|
|
}
|
|
|
|
void putchar(byte x, byte y, byte attr) {
|
|
cvu_voutb(attr, getimageaddr(x,y));
|
|
}
|
|
|
|
void putstring(byte x, byte y, const char* string) {
|
|
while (*string) {
|
|
putchar(x++, y, CHAR(*string++));
|
|
}
|
|
}
|
|
|
|
void delay(byte i) {
|
|
while (i--) {
|
|
wait_vsync();
|
|
}
|
|
}
|
|
|
|
byte rndint(byte a, byte b) {
|
|
return ((byte)rand() % (b-a+1)) + a;
|
|
}
|
|
|
|
void memset_safe(void* _dest, char ch, word size) {
|
|
byte* dest = _dest;
|
|
while (size--) {
|
|
*dest++ = ch;
|
|
}
|
|
}
|
|
|
|
char in_rect(byte x, byte y, byte x0, byte y0, byte w, byte h) {
|
|
return ((byte)(x-x0) < w && (byte)(y-y0) < h); // unsigned
|
|
}
|
|
|
|
void draw_bcd_word(byte x, byte y, word bcd) {
|
|
byte j;
|
|
x += 3;
|
|
for (j=0; j<4; j++) {
|
|
putchar(x, y, CHAR('0'+(bcd&0xf)));
|
|
x--;
|
|
bcd >>= 4;
|
|
}
|
|
}
|
|
|
|
// add two 16-bit BCD values
|
|
word bcd_add(word a, word b) __naked {
|
|
a; b; // to avoid warning
|
|
__asm
|
|
push ix
|
|
ld ix,#0
|
|
add ix,sp
|
|
ld a,4 (ix)
|
|
add a, 6 (ix)
|
|
daa
|
|
ld c,a
|
|
ld a,5 (ix)
|
|
adc a, 7 (ix)
|
|
daa
|
|
ld b,a
|
|
ld l, c
|
|
ld h, b
|
|
pop ix
|
|
ret
|
|
__endasm;
|
|
}
|
|
|
|
void vdp_setup() {
|
|
cv_set_screen_active(false);
|
|
cv_set_screen_mode(CV_SCREENMODE_STANDARD);
|
|
cv_set_image_table(IMAGE);
|
|
cv_set_character_pattern_t(PATTERN);
|
|
cv_set_color_table(COLOR);
|
|
cv_set_sprite_pattern_table(SPRITE_PATTERNS);
|
|
cv_set_sprite_attribute_table(SPRITES);
|
|
cv_set_sprite_big(true);
|
|
}
|
|
|
|
void set_shifted_pattern(const byte* src, word dest, byte shift) {
|
|
byte y;
|
|
for (y=0; y<8; y++) {
|
|
byte a = src[y+8];
|
|
byte b = src[y];
|
|
cvu_voutb(a>>shift, dest);
|
|
cvu_voutb(b>>shift | a<<(8-shift), dest+8);
|
|
cvu_voutb(b<<(8-shift), dest+16);
|
|
dest++;
|
|
}
|
|
}
|