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1 #include <stdlib.h>
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2 #include "mouse.h"
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3 #include "inttypes.h"
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4
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5
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6 #define REG_BASE_ADDR 0xdff000
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7 #define REGNO_JOY0DAT 0x00a
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8 #define REG_JOY0DAT *(volatile uint16_t*)(REG_BASE_ADDR | REGNO_JOY0DAT)
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9 #define REG_CIAA_PORTA *(volatile uint8_t*)0xbfe001
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10
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11 #define CIAA_PA_FIR0 0x40
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12 #define CIAA_PA_FIR1 0x80
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13
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14 static int xrng[2] = {0, 320};
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15 static int yrng[2] = {0, 240};
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16
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17 void set_mouse_bounds(int x0, int y0, int x1, int y1)
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18 {
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19 xrng[0] = x0;
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20 xrng[1] = x1;
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21 yrng[0] = y0;
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22 yrng[1] = y1;
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23 }
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24
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25 int mouse_state(int *x, int *y)
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26 {
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27 mouse_pos(x, y);
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28 return mouse_bnstate();
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29 }
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30
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31 int mouse_bnstate(void)
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32 {
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33 /* TODO: handle right mouse button */
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34 return (REG_CIAA_PORTA & CIAA_PA_FIR0) ? 0 : 1;
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35 }
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36
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37 /* TODO: for when I feel like making a proper mouse handler
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38 * use vblank interrupt vector to read the mouse register once
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39 * and have mouse_pos (and friends) simply access the global data
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40 */
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41 void mouse_pos(int *x, int *y)
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42 {
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43 static int xpos, ypos;
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44 static int prev_xcount, prev_ycount;
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45 int xcount, ycount, dx, dy;
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46 uint16_t raw = REG_JOY0DAT;
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47
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48 xcount = raw & 0xff;
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49 ycount = raw >> 8;
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50
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51 dx = xcount - prev_xcount;
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52 dy = ycount - prev_ycount;
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53
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54 if(abs(dx) > 127) dx = 255 - (xcount - prev_xcount);
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55 if(abs(dy) > 127) dy = 255 - (ycount - prev_ycount);
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56 prev_xcount = xcount;
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57 prev_ycount = ycount;
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58
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59 xpos += dx;
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60 ypos += dy;
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61
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62 if(xpos < xrng[0]) xpos = xrng[0];
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63 if(ypos < yrng[0]) ypos = yrng[0];
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64 if(xpos >= xrng[1]) xpos = xrng[1] - 1;
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65 if(ypos >= yrng[1]) ypos = yrng[1] - 1;
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66
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67 *x = xpos;
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68 *y = ypos;
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69 }
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