e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 Sam Lantinga |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2 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 | Library General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Library General Public |
16 | License along with this library; if not, write to the Free |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | |
19 | Sam Lantinga |
20 | slouken@libsdl.org |
21 | */ |
22 | #include "SDL_config.h" |
23 | |
24 | /* |
25 | This file added by Alan Buckley (alan_baa@hotmail.com) to support RISC OS |
26 | 26 March 2003 |
27 | |
28 | File includes routines for: |
29 | Setting up as a WIMP Task |
30 | Reading information about the current desktop |
31 | Storing information before a switch to full screen |
32 | Restoring desktop after switching to full screen |
33 | */ |
34 | |
35 | #include "kernel.h" |
36 | #include "swis.h" |
37 | |
38 | #include "SDL_stdinc.h" |
39 | #include "SDL_riscostask.h" |
40 | |
41 | #if !SDL_THREADS_DISABLED |
42 | #include <pthread.h> |
43 | pthread_t main_thread; |
44 | #endif |
45 | |
46 | /* RISC OS variables */ |
47 | |
48 | static int task_handle = 0; |
49 | static int wimp_version = 0; |
50 | |
51 | /* RISC OS variables to help compatability with certain programs */ |
52 | int riscos_backbuffer = 0; /* Create a back buffer in system memory for full screen mode */ |
53 | int riscos_closeaction = 1; /* Close icon action */ |
54 | |
55 | static int stored_mode = -1; /* -1 when in desktop, mode number or pointer when full screen */ |
56 | |
57 | extern int mouseInWindow; /* Mouse is in WIMP window */ |
58 | |
59 | /* Local function */ |
60 | |
61 | static int RISCOS_GetTaskName(char *task_name, size_t maxlen); |
62 | |
63 | /* Uncomment next line to copy mode changes/restores to stderr */ |
64 | /* #define DUMP_MODE */ |
65 | #ifdef DUMP_MODE |
66 | #include "stdio.h" |
67 | static void dump_mode() |
68 | { |
69 | fprintf(stderr, "mode %d\n", stored_mode); |
70 | if (stored_mode < -1 || stored_mode >= 256) |
71 | { |
72 | int blockSize = 0; |
73 | int *storeBlock = (int *)stored_mode; |
74 | |
75 | while(blockSize < 5 || storeBlock[blockSize] != -1) |
76 | { |
77 | fprintf(stderr, " %d\n", storeBlock[blockSize++]); |
78 | } |
79 | } |
80 | } |
81 | #endif |
82 | |
83 | /****************************************************************** |
84 | |
85 | Initialise as RISC OS Wimp task |
86 | |
87 | *******************************************************************/ |
88 | |
89 | int RISCOS_InitTask() |
90 | { |
91 | char task_name[32]; |
92 | _kernel_swi_regs regs; |
93 | int messages[4]; |
94 | |
95 | if (RISCOS_GetTaskName(task_name, SDL_arraysize(task_name)) == 0) return 0; |
96 | |
97 | messages[0] = 9; /* Palette changed */ |
98 | messages[1] = 0x400c1; /* Mode changed */ |
99 | messages[2] = 8; /* Pre quit */ |
100 | messages[2] = 0; |
101 | |
102 | regs.r[0] = (unsigned int)360; /* Minimum version 3.6 */ |
103 | regs.r[1] = (unsigned int)0x4b534154; |
104 | regs.r[2] = (unsigned int)task_name; |
105 | regs.r[3] = (unsigned int)messages; |
106 | |
107 | if (_kernel_swi(Wimp_Initialise, ®s, ®s) == 0) |
108 | { |
109 | wimp_version = regs.r[0]; |
110 | task_handle = regs.r[1]; |
111 | return 1; |
112 | } |
113 | |
114 | #if !SDL_THREADS_DISABLED |
115 | main_thread = pthread_self(); |
116 | #endif |
117 | |
118 | return 0; |
119 | } |
120 | |
121 | /********************************************************************* |
122 | |
123 | Close down application on exit. |
124 | |
125 | **********************************************************************/ |
126 | |
127 | void RISCOS_ExitTask() |
128 | { |
129 | _kernel_swi_regs regs; |
130 | |
131 | if (stored_mode == -1) |
132 | { |
133 | /* Ensure cursor is put back to standard pointer shape if |
134 | we have been running in a window */ |
135 | _kernel_osbyte(106,1,0); |
136 | } |
137 | |
138 | /* Ensure we end up back in the wimp */ |
139 | RISCOS_RestoreWimpMode(); |
140 | |
141 | /* Neatly exit the task */ |
142 | regs.r[0] = task_handle; |
143 | regs.r[1] = (unsigned int)0x4b534154; |
144 | _kernel_swi(Wimp_CloseDown, ®s, ®s); |
145 | task_handle = 0; |
146 | } |
147 | |
148 | /************************************************************************** |
149 | |
150 | Get the name of the task for the desktop. |
151 | |
152 | Param: task_name - name of task 32 characters. |
153 | |
154 | Returns: 1 is successful, otherwise 0 |
155 | |
156 | Notes: Works by getting using OS_GetEnv to get the command line |
157 | used to run the program and then parsing a name from it |
158 | as follows. |
159 | |
160 | 1. Use name after final period if not !RunImage |
161 | 2. If name is !RunImage then process item before the period |
162 | in front of !RunImage. |
163 | 3. If directory name use that |
164 | 4. if in form <XXX$Dir> use the XXX. |
165 | |
166 | Finally once this value has been retrieved use it unless |
167 | there is a variable set up in the form SDL$<name>$TaskName |
168 | in which case the value of this variable will be used. |
169 | |
170 | Now also gets other RISC OS configuration varibles |
171 | SDL$<name>$BackBuffer - set to 1 to use a system memory backbuffer in fullscreen mode |
172 | so updates wait until a call to SDL_UpdateRects. (default 0) |
173 | This is required for programmes where they have assumed this is |
174 | always the case which is contrary to the documentation. |
175 | SDL$<name>$CloseAction |
176 | 0 Don't show close icon |
177 | 1 Show close icon |
178 | |
179 | ***************************************************************************/ |
180 | |
181 | int RISCOS_GetTaskName(char *task_name, size_t maxlen) |
182 | { |
183 | _kernel_swi_regs regs; |
184 | |
185 | task_name[0] = 0; |
186 | |
187 | /* Figure out a sensible task name */ |
188 | if (_kernel_swi(OS_GetEnv, ®s, ®s) == 0) |
189 | { |
190 | char *command_line = (char *)regs.r[0]; |
191 | size_t len = SDL_strlen(command_line)+1; |
192 | char *buffer = SDL_stack_alloc(char, len); |
193 | char *env_var; |
194 | char *p; |
195 | |
196 | SDL_strlcpy(buffer, command_line, len); |
197 | p = SDL_strchr(buffer, ' '); |
198 | if (p) *p = 0; |
199 | p = SDL_strrchr(buffer, '.'); |
200 | if (p == 0) p = buffer; |
201 | if (stricmp(p+1,"!RunImage") == 0) |
202 | { |
203 | *p = 0; |
204 | p = SDL_strrchr(buffer, '.'); |
205 | if (p == 0) p = buffer; |
206 | } |
207 | if (*p == '.') p++; |
208 | if (*p == '!') p++; /* Skip "!" at beginning of application directories */ |
209 | |
210 | if (*p == '<') |
211 | { |
212 | // Probably in the form <appname$Dir> |
213 | char *q = SDL_strchr(p, '$'); |
214 | if (q == 0) q = SDL_strchr(p,'>'); /* Use variable name if not */ |
215 | if (q) *q = 0; |
216 | p++; /* Move over the < */ |
217 | } |
218 | |
219 | if (*p) |
220 | { |
221 | /* Read variables that effect the RISC OS SDL engine for this task */ |
222 | len = SDL_strlen(p) + 18; /* 18 is larger than the biggest variable name */ |
223 | env_var = SDL_stack_alloc(char, len); |
224 | if (env_var) |
225 | { |
226 | char *env_val; |
227 | |
228 | /* See if a variable of form SDL$<dirname>$TaskName exists */ |
229 | |
230 | SDL_strlcpy(env_var, "SDL$", len); |
231 | SDL_strlcat(env_var, p, len); |
232 | SDL_strlcat(env_var, "$TaskName", len); |
233 | |
234 | env_val = SDL_getenv(env_var); |
235 | if (env_val) SDL_strlcpy(task_name, env_val, maxlen); |
236 | |
237 | SDL_strlcpy(env_var, "SDL$", len); |
238 | SDL_strlcat(env_var, p, len); |
239 | SDL_strlcat(env_var, "$BackBuffer", len); |
240 | |
241 | env_val = SDL_getenv(env_var); |
242 | if (env_val) riscos_backbuffer = atoi(env_val); |
243 | |
244 | SDL_strlcpy(env_var, "SDL$", len); |
245 | SDL_strlcat(env_var, p, len); |
246 | SDL_strlcat(env_var, "$CloseAction", len); |
247 | |
248 | env_val = SDL_getenv(env_var); |
249 | if (env_val && SDL_strcmp(env_val,"0") == 0) riscos_closeaction = 0; |
250 | |
251 | SDL_stack_free(env_var); |
252 | } |
253 | |
254 | if (!*task_name) SDL_strlcpy(task_name, p, maxlen); |
255 | } |
256 | |
257 | SDL_stack_free(buffer); |
258 | } |
259 | |
260 | if (task_name[0] == 0) SDL_strlcpy(task_name, "SDL Task", maxlen); |
261 | |
262 | return 1; |
263 | } |
264 | |
265 | /***************************************************************** |
266 | |
267 | Store the current desktop screen mode if we are in the desktop. |
268 | |
269 | ******************************************************************/ |
270 | |
271 | void RISCOS_StoreWimpMode() |
272 | { |
273 | _kernel_swi_regs regs; |
274 | |
275 | /* Don't store if in full screen mode */ |
276 | if (stored_mode != -1) return; |
277 | |
278 | regs.r[0] = 1; |
279 | _kernel_swi(OS_ScreenMode, ®s, ®s); |
280 | if (regs.r[1] >= 0 && regs.r[1] < 256) stored_mode = regs.r[1]; |
281 | else |
282 | { |
283 | int blockSize = 0; |
284 | int *retBlock = (int *)regs.r[1]; |
285 | int *storeBlock; |
286 | int j; |
287 | |
288 | while(blockSize < 5 || retBlock[blockSize] != -1) blockSize++; |
289 | blockSize++; |
290 | storeBlock = (int *)SDL_malloc(blockSize * sizeof(int)); |
291 | retBlock = (int *)regs.r[1]; |
292 | for ( j = 0; j < blockSize; j++) |
293 | storeBlock[j] = retBlock[j]; |
294 | |
295 | stored_mode = (int)storeBlock; |
296 | } |
297 | #if DUMP_MODE |
298 | fprintf(stderr, "Stored "); dump_mode(); |
299 | #endif |
300 | } |
301 | |
302 | /***************************************************************** |
303 | |
304 | Restore desktop screen mode if we are in full screen mode. |
305 | |
306 | *****************************************************************/ |
307 | |
308 | void RISCOS_RestoreWimpMode() |
309 | { |
310 | _kernel_swi_regs regs; |
311 | |
312 | /* Only need to restore if we are in full screen mode */ |
313 | if (stored_mode == -1) return; |
314 | |
315 | #if DUMP_MODE |
316 | fprintf(stderr, "Restored"); dump_mode(); |
317 | #endif |
318 | |
319 | regs.r[0] = stored_mode; |
320 | _kernel_swi(Wimp_SetMode, ®s, ®s); |
321 | if (stored_mode < 0 || stored_mode > 256) |
322 | { |
323 | SDL_free((int *)stored_mode); |
324 | } |
325 | stored_mode = -1; |
326 | |
327 | /* Flush keyboard buffer to dump the keystrokes we've already polled */ |
328 | regs.r[0] = 21; |
329 | regs.r[1] = 0; /* Keyboard buffer number */ |
330 | _kernel_swi(OS_Byte, ®s, ®s); |
331 | |
332 | mouseInWindow = 0; |
333 | |
334 | } |
335 | |
336 | /********************************************************************* |
337 | |
338 | Get version of Wimp running when task was initialised. |
339 | |
340 | *********************************************************************/ |
341 | |
342 | int RISCOS_GetWimpVersion() |
343 | { |
344 | return wimp_version; |
345 | } |
346 | |
347 | int RISCOS_GetTaskHandle() |
348 | { |
349 | return task_handle; |
350 | } |