52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
#include "util.h"
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#include <stdint.h>
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#include <stdio.h>
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#include <conio.h>
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#define PB0 ((char*)0xC061)
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#define PB1 ((char*)0xC062)
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char read_applekey(void) { return ((*PB0) | (*PB1)) & 0x80; }
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#define VBL ((signed char*)0xC019)
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#define SPIN_HALFCYCLES 3
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#define SPIN_FRAMESPERCHAR 4
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void spin(uint8_t x, uint8_t y) {
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char i;
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// Sync to frame before starting
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while (*VBL >= 0);
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// Wait and animate spinner.
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// Spin_half
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for (i = 0; i < SPIN_HALFCYCLES; i++) {
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char j;
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for (j = 0; j < 4; j++) {
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char spinchar;
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char k;
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// Assign spinner char based on j
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switch (j) {
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case 0: spinchar = '\\'; break;
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case 1: spinchar = '|'; break;
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case 2: spinchar = '/'; break;
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case 3: spinchar = '-'; break;
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default: spinchar = '-'; break;
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}
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// Write it to screen
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gotoxy(x, y);
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putchar(spinchar);
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// Wait specificed number of frames
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for (k = 0; k < SPIN_FRAMESPERCHAR; k++) {
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while (*VBL < 0);
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while (*VBL >= 0);
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}
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}
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}
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// Wait a frame when finished
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while (*VBL < 0);
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while (*VBL >= 0);
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} |