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1.1 root 1: /*
2: * UAE - The Un*x Amiga Emulator
3: *
4: * Joystick emulation for DOS
5: *
6: * Copyright 1996, 1997 Gustavo Goedert
7: */
8:
9: #include "sysconfig.h"
10: #include "sysdeps.h"
11:
12: #include <dos.h>
13:
14: #include "config.h"
15: #include "options.h"
16: #include "memory.h"
17: #include "custom.h"
18: #include "joystick.h"
19:
1.1.1.2 ! root 20: int nr_joysticks;
1.1 root 21: int HasJoy0 = 0, HasJoy1 = 0;
22: int minx0, maxx0, miny0, maxy0;
23: int minx1, maxx1, miny1, maxy1;
24:
25: void read_joystick(int nr, unsigned int *dir, int *button) {
26: int *minx, *maxx, *miny, *maxy;
27: int left = 0, right = 0, top = 0, bot = 0;
28: char JoyPort;
29: int laps, JoyX, JoyY, XCenter, YCenter, XDelta, YDelta;
30:
31: *dir = 0;
32: *button = 0;
33: if (((nr == 0) && (HasJoy0 == 0)) || ((nr == 1) && (HasJoy1 == 0)))
34: return;
35:
36: JoyX = 0;
37: JoyY = 0;
38: laps = 0;
39: outportb(0x201, 0xff);
40: if (nr == 0) {
41: disable();
42: do {
43: JoyPort = inportb(0x201);
44: if (JoyPort & 1)
45: JoyX++;
46: if (JoyPort & 2)
47: JoyY++;
48: laps++;
49: } while(((JoyPort & 3) != 0) && (laps != 65535));
50: enable();
51: if (laps == 65535) {
52: HasJoy0 = 0;
53: return;
54: }
55: minx = &minx0;
56: maxx = &maxx0;
57: miny = &miny0;
58: maxy = &maxy0;
59: } else {
60: disable();
61: do {
62: JoyPort = inportb(0x201);
63: if (JoyPort & 4)
64: JoyX++;
65: if (JoyPort & 8)
66: JoyY++;
67: laps++;
68: } while(((JoyPort & 12) != 0) && (laps != 65535));
69: enable();
70: if (laps == 65535) {
71: HasJoy1 = 0;
72: return;
73: }
74: minx = &minx1;
75: maxx = &maxx1;
76: miny = &miny1;
77: maxy = &maxy1;
78: }
79:
80: if (JoyX < (*minx)) *minx = JoyX;
81: if (JoyY < (*miny)) *miny = JoyY;
82: if (JoyX > (*maxx)) *maxx = JoyX;
83: if (JoyY > (*maxy)) *maxy = JoyY;
84:
85: XCenter = ((*maxx)+(*minx))/2;
86: YCenter = ((*maxy)+(*miny))/2;
87: XDelta = ((*maxx)-(*minx))/3;
88: YDelta = ((*maxy)-(*miny))/3;
89:
90: if (JoyX < (XCenter-XDelta))
91: left = 1;
92: if (JoyX > (XCenter+XDelta))
93: right = 1;
94:
95: if (JoyY < (YCenter-YDelta))
96: top = 1;
97: if (JoyY > (YCenter+YDelta))
98: bot = 1;
99:
100: if (left) top = !top;
101: if (right) bot = !bot;
102: *dir = bot | (right << 1) | (top << 8) | (left << 9);
103:
104: JoyPort = ~JoyPort;
105: if (nr == 0) {
106: if (JoyPort & 16) *button += 1;
107: if (JoyPort & 32) *button += 2;
108: } else {
109: if (JoyPort & 64) *button += 1;
110: if (JoyPort & 128) *button += 2;
111: }
112: if ((*button) == 3) *button = 4;
113: }
114:
115: void init_joystick(void) {
116: int laps, JoyX, JoyY;
117: char JoyPort;
118:
119: JoyX = 0;
120: JoyY = 0;
121: laps = 0;
122: disable();
123: outportb(0x201, 0xff);
124: do {
125: JoyPort = inportb(0x201);
126: if (JoyPort & 1)
127: JoyX++;
128: if (JoyPort & 2)
129: JoyY++;
130: laps++;
131: } while(((JoyPort & 3) != 0) && (laps != 65535));
132: enable();
133: if (laps != 65535) {
134: HasJoy0 = 1;
135: minx0 = JoyX - 2*JoyX/3;
136: maxx0 = JoyX + 2*JoyX/3;
137: miny0 = JoyY - 2*JoyY/3;
138: maxy0 = JoyY + 2*JoyY/3;
139: }
140:
141: JoyX = 0;
142: JoyY = 0;
143: laps = 0;
144: disable();
145: outportb(0x201, 0xff);
146: do {
147: JoyPort = inportb(0x201);
148: if (JoyPort & 4)
149: JoyX++;
150: if (JoyPort & 8)
151: JoyY++;
152: laps++;
153: } while(((JoyPort & 12) != 0) && (laps != 65535));
154: enable();
155: if (laps != 65535) {
156: HasJoy1 = 1;
157: minx1 = JoyX - 2*JoyX/3;
158: maxx1 = JoyX + 2*JoyX/3;
159: miny1 = JoyY - 2*JoyY/3;
160: maxy1 = JoyY + 2*JoyY/3;
161: }
1.1.1.2 ! root 162:
! 163: nr_joysticks = HasJoy0 + HasJoy1;
1.1 root 164: }
165:
166: void close_joystick(void) {
167: }
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