57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
#include <dos.h>
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#include <conio.h>
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#include "keyboard.h"
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unsigned char keystateBits[16];
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struct KeyboardKeydownState keyboardKeydownState;
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void far (interrupt *int9Save)();
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void populateKeyboardKeydownState() {
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keyboardKeydownState.KEY_W = keystateBits[2] & 0x02;
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keyboardKeydownState.KEY_A = keystateBits[3] & 0x40;
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keyboardKeydownState.KEY_S = keystateBits[3] & 0x80;
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keyboardKeydownState.KEY_D = keystateBits[4] & 0x01;
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}
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void far interrupt keyboardHandler(void) {
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unsigned char rawcode, scancode, ksbByte, temp;
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unsigned char mask = 1;
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_disable();
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rawcode = inp(0x60);
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scancode = rawcode & 0x7f;
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mask = 1 << (scancode & 0x07);
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ksbByte = scancode >> 3;
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// https://github.com/id-Software/wolf3d/blob/05167784ef009d0d0daefe8d012b027f39dc8541/WOLFSRC/ID_IN.C#L152-L154
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outp(0x61, (temp = inp(0x61)) | 0x80);
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outp(0x61, temp);
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/* break */
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if (rawcode & 0x80) {
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mask = 0xff - mask;
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keystateBits[ksbByte] &= mask;
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/* make */
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} else {
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keystateBits[ksbByte] |= mask;
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}
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// acknowledge we're done with the interrupt
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outp(0x20, 0x20);
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_enable();
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}
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void installKeyboardHandler() {
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int9Save = _dos_getvect(9);
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_dos_setvect(9, keyboardHandler);
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}
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void uninstallKeyboardHandler() {
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_dos_setvect(9, int9Save);
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}
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