diff options
Diffstat (limited to 'apps/plugins/sdl/src/joystick/riscos/SDL_sysjoystick.c')
-rw-r--r-- | apps/plugins/sdl/src/joystick/riscos/SDL_sysjoystick.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/apps/plugins/sdl/src/joystick/riscos/SDL_sysjoystick.c b/apps/plugins/sdl/src/joystick/riscos/SDL_sysjoystick.c new file mode 100644 index 0000000000..214d4c7474 --- /dev/null +++ b/apps/plugins/sdl/src/joystick/riscos/SDL_sysjoystick.c | |||
@@ -0,0 +1,176 @@ | |||
1 | /* | ||
2 | SDL - Simple DirectMedia Layer | ||
3 | Copyright (C) 1997-2012 Sam Lantinga | ||
4 | |||
5 | This library is free software; you can redistribute it and/or | ||
6 | modify it under the terms of the GNU Lesser General Public | ||
7 | License as published by the Free Software Foundation; either | ||
8 | version 2.1 of the License, or (at your option) any later version. | ||
9 | |||
10 | This library is distributed in the hope that it will be useful, | ||
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Lesser General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Lesser General Public | ||
16 | License along with this library; if not, write to the Free Software | ||
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
18 | |||
19 | Sam Lantinga | ||
20 | slouken@libsdl.org | ||
21 | */ | ||
22 | #include "SDL_config.h" | ||
23 | |||
24 | #ifdef SDL_JOYSTICK_RISCOS | ||
25 | |||
26 | /* | ||
27 | RISC OS - Joystick support by Alan Buckley (alan_baa@hotmail.com) - 10 April 2003 | ||
28 | |||
29 | Note: Currently assumes joystick is present if joystick module is loaded | ||
30 | and that there is one joystick with four buttons. | ||
31 | */ | ||
32 | |||
33 | /* This is the system specific header for the SDL joystick API */ | ||
34 | |||
35 | #include "SDL_events.h" | ||
36 | #include "SDL_joystick.h" | ||
37 | #include "../SDL_sysjoystick.h" | ||
38 | #include "../SDL_joystick_c.h" | ||
39 | |||
40 | #include "kernel.h" | ||
41 | |||
42 | #define JOYSTICK_READ 0x43F40 | ||
43 | |||
44 | struct joystick_hwdata | ||
45 | { | ||
46 | int joystate; | ||
47 | }; | ||
48 | |||
49 | |||
50 | /* Function to scan the system for joysticks. | ||
51 | * This function should set SDL_numjoysticks to the number of available | ||
52 | * joysticks. Joystick 0 should be the system default joystick. | ||
53 | * It should return number of joysticks, or -1 on an unrecoverable fatal error. | ||
54 | */ | ||
55 | int SDL_SYS_JoystickInit(void) | ||
56 | { | ||
57 | _kernel_swi_regs regs; | ||
58 | |||
59 | /* Try to read joystick 0 */ | ||
60 | regs.r[0] = 0; | ||
61 | if (_kernel_swi(JOYSTICK_READ, ®s, ®s) == NULL) | ||
62 | { | ||
63 | /* Switch works so assume we've got a joystick */ | ||
64 | return 1; | ||
65 | } | ||
66 | /* Switch fails so it looks like there's no joystick here */ | ||
67 | |||
68 | return(0); | ||
69 | } | ||
70 | |||
71 | /* Function to get the device-dependent name of a joystick */ | ||
72 | const char *SDL_SYS_JoystickName(int index) | ||
73 | { | ||
74 | if (index == 0) | ||
75 | { | ||
76 | return "RISC OS Joystick 0"; | ||
77 | } | ||
78 | |||
79 | SDL_SetError("No joystick available with that index"); | ||
80 | return(NULL); | ||
81 | } | ||
82 | |||
83 | /* Function to open a joystick for use. | ||
84 | The joystick to open is specified by the index field of the joystick. | ||
85 | This should fill the nbuttons and naxes fields of the joystick structure. | ||
86 | It returns 0, or -1 if there is an error. | ||
87 | */ | ||
88 | int SDL_SYS_JoystickOpen(SDL_Joystick *joystick) | ||
89 | { | ||
90 | _kernel_swi_regs regs; | ||
91 | |||
92 | if(!(joystick->hwdata=SDL_malloc(sizeof(struct joystick_hwdata)))) | ||
93 | return -1; | ||
94 | |||
95 | regs.r[0] = joystick->index; | ||
96 | |||
97 | /* Don't know how to get exact count of buttons so assume max of 4 for now */ | ||
98 | joystick->nbuttons=4; | ||
99 | |||
100 | joystick->nhats=0; | ||
101 | joystick->nballs=0; | ||
102 | joystick->naxes=2; | ||
103 | joystick->hwdata->joystate=0; | ||
104 | |||
105 | return 0; | ||
106 | |||
107 | } | ||
108 | |||
109 | /* Function to update the state of a joystick - called as a device poll. | ||
110 | * This function shouldn't update the joystick structure directly, | ||
111 | * but instead should call SDL_PrivateJoystick*() to deliver events | ||
112 | * and update joystick device state. | ||
113 | */ | ||
114 | void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick) | ||
115 | { | ||
116 | _kernel_swi_regs regs; | ||
117 | regs.r[0] = joystick->index; | ||
118 | |||
119 | if (_kernel_swi(JOYSTICK_READ, ®s, ®s) == NULL) | ||
120 | { | ||
121 | int newstate = regs.r[0]; | ||
122 | int oldstate = joystick->hwdata->joystate; | ||
123 | if (newstate != oldstate) | ||
124 | { | ||
125 | if ((newstate & 0xFF) != (oldstate & 0xFF)) | ||
126 | { | ||
127 | int y = regs.r[0] & 0xFF; | ||
128 | /* Convert to signed values */ | ||
129 | if (y >= 128) y -= 256; | ||
130 | SDL_PrivateJoystickAxis(joystick,1,-y * 256); /* Up and down opposite to result in SDL */ | ||
131 | } | ||
132 | if ((newstate & 0xFF00) != (oldstate & 0xFF00)) | ||
133 | { | ||
134 | int x = (regs.r[0] & 0xFF00) >> 8; | ||
135 | if (x >= 128) x -= 256; | ||
136 | SDL_PrivateJoystickAxis(joystick,0,x * 256); | ||
137 | } | ||
138 | |||
139 | if ((newstate & 0xFF0000) != (oldstate & 0xFF0000)) | ||
140 | { | ||
141 | int buttons = (regs.r[0] & 0xFF0000) >> 16; | ||
142 | int oldbuttons = (oldstate & 0xFF0000) >> 16; | ||
143 | int i; | ||
144 | for (i = 0; i < joystick->nbuttons; i++) | ||
145 | { | ||
146 | if ((buttons & (1<<i)) != (oldbuttons & (1<<i))) | ||
147 | { | ||
148 | if (buttons & (1<<i)) SDL_PrivateJoystickButton(joystick,i,SDL_PRESSED); | ||
149 | else SDL_PrivateJoystickButton(joystick,i,SDL_RELEASED); | ||
150 | } | ||
151 | } | ||
152 | } | ||
153 | joystick->hwdata->joystate = newstate; | ||
154 | } | ||
155 | } | ||
156 | |||
157 | return; | ||
158 | } | ||
159 | |||
160 | /* Function to close a joystick after use */ | ||
161 | void SDL_SYS_JoystickClose(SDL_Joystick *joystick) | ||
162 | { | ||
163 | if(joystick->hwdata) | ||
164 | SDL_free(joystick->hwdata); | ||
165 | return; | ||
166 | } | ||
167 | |||
168 | /* Function to perform any system-specific joystick related cleanup */ | ||
169 | void SDL_SYS_JoystickQuit(void) | ||
170 | { | ||
171 | SDL_numjoysticks=0; | ||
172 | |||
173 | return; | ||
174 | } | ||
175 | |||
176 | #endif /* SDL_JOYSTICK_RISCOS */ | ||