63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
#include <dos.h>
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#include <conio.h>
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#include <i86.h>
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#include "mouse_io.h"
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struct MouseStatus *_status;
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int limitMouseArea(int sx, int sy, int ex, int ey) {
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union REGS regs;
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// set horiz and vert range
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regs.w.ax = 0x07;
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regs.w.cx = sx;
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regs.w.dx = ex;
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int386(MOUSE_DRIVER_INTERRUPT, ®s, ®s);
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regs.w.ax = 0x08;
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regs.w.cx = sy;
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regs.w.dx = ey;
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int386(MOUSE_DRIVER_INTERRUPT, ®s, ®s);
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}
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/**
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* Ensure this is called after setting the desired video mode.
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*/
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int activateMouse(struct MouseStatus *status) {
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union REGS regs;
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int mouseActivated;
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regs.w.ax = MOUSE_DRIVER_RESET;
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int386(MOUSE_DRIVER_INTERRUPT, ®s, ®s);
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mouseActivated = regs.w.ax;
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if (mouseActivated) {
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status->isActive = regs.w.ax;
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status->buttonCount = regs.w.bx;
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limitMouseArea(0, 0, VGA_DISPLAY_WIDTH - 1, VGA_DISPLAY_HEIGHT - 1);
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}
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_status = status;
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return mouseActivated;
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}
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void readMouse() {
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union REGS regs;
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int buttonStatus;
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regs.w.ax = MOUSE_DRIVER_READ_STATE;
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int386(MOUSE_DRIVER_INTERRUPT, ®s, ®s);
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buttonStatus = regs.w.bx;
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_status->xPosition = regs.w.cx;
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_status->yPosition = regs.w.dx;
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_status->leftButtonDown = buttonStatus & 1;
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_status->rightButtonDown = (buttonStatus >> 1) & 1;
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}
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