mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-12-25 00:31:04 +00:00
125 lines
2.3 KiB
C
125 lines
2.3 KiB
C
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#include <stdlib.h>
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#include <string.h>
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#include <cv.h>
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#include <cvu.h>
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#include "common.h"
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volatile uint_fast8_t vint_counter;
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void vint_handler(void) {
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vint_counter++;
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}
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const unsigned char reverse_lookup[16] = {
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0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe, 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf, };
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byte reverse_bits(byte n) {
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return (reverse_lookup[n&0b1111] << 4) | reverse_lookup[n>>4];
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}
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void flip_sprite_patterns(word dest, const byte* patterns, word len) {
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word i;
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for (i=0; i<len; i++) {
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cvu_voutb(reverse_bits(*patterns++), dest++ ^ 16); // swap left/right chars
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}
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}
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char cursor_x;
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char cursor_y;
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void clrscr() {
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cvu_vmemset(IMAGE, 0, COLS*ROWS);
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}
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byte getchar(byte x, byte y) {
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return cvu_vinb(IMAGE + y*COLS + x);
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}
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void putchar(byte x, byte y, byte attr) {
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cvu_voutb(attr, IMAGE + y*COLS + x);
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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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void delay(byte i) {
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while (i--) {
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wait_vsync();
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}
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}
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byte rndint(byte a, byte b) {
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return ((byte)rand() % (b-a+1)) + a;
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}
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void memset_safe(void* _dest, char ch, word size) {
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byte* dest = _dest;
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while (size--) {
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*dest++ = ch;
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}
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}
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char in_rect(byte x, byte y, byte x0, byte y0, byte w, byte h) {
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return ((byte)(x-x0) < w && (byte)(y-y0) < h); // unsigned
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}
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void draw_bcd_word(byte x, byte y, word bcd) {
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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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putchar(x, y, CHAR('0'+(bcd&0xf)));
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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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void vdp_setup() {
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cv_set_screen_active(false);
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cv_set_screen_mode(CV_SCREENMODE_STANDARD);
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cv_set_image_table(IMAGE);
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cv_set_character_pattern_t(PATTERN);
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cv_set_color_table(COLOR);
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cv_set_sprite_pattern_table(SPRITE_PATTERNS);
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cv_set_sprite_attribute_table(SPRITES);
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cv_set_sprite_big(true);
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}
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void set_shifted_pattern(const byte* src, word dest, byte shift) {
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byte y;
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for (y=0; y<8; y++) {
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byte a = src[y+8];
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byte b = src[y];
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cvu_voutb(a>>shift, dest);
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cvu_voutb(b>>shift | a<<(8-shift), dest+8);
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cvu_voutb(b<<(8-shift), dest+16);
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dest++;
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}
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}
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