Repository navigation
Expand file tree
/
Copy pathSDL_hints.c
More file actions
404 lines (340 loc) · 11.6 KB
/
Copy pathSDL_hints.c
File metadata and controls
404 lines (340 loc) · 11.6 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
/*
Simple DirectMedia Layer
Copyright (C) 1997-2026 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"
#include "SDL_hints_c.h"
#ifdef SDL_PLATFORM_ANDROID
#include "core/android/SDL_android.h"
#endif
typedef struct SDL_HintWatch
{
SDL_HintCallback callback;
void *userdata;
struct SDL_HintWatch *next;
} SDL_HintWatch;
typedef struct SDL_Hint
{
char *value;
SDL_HintPriority priority;
SDL_HintWatch *callbacks;
} SDL_Hint;
static SDL_AtomicU32 SDL_hint_props;
void SDL_InitHints(void)
{
}
void SDL_QuitHints(void)
{
SDL_PropertiesID props;
do {
props = SDL_GetAtomicU32(&SDL_hint_props);
} while (!SDL_CompareAndSwapAtomicU32(&SDL_hint_props, props, 0));
if (props) {
SDL_DestroyProperties(props);
}
}
static SDL_PropertiesID GetHintProperties(bool create)
{
SDL_PropertiesID props = SDL_GetAtomicU32(&SDL_hint_props);
if (!props && create) {
props = SDL_CreateProperties();
if (!SDL_CompareAndSwapAtomicU32(&SDL_hint_props, 0, props)) {
// Somebody else created hint properties before us, just use those
SDL_DestroyProperties(props);
props = SDL_GetAtomicU32(&SDL_hint_props);
}
}
return props;
}
static void SDLCALL CleanupHintProperty(void *userdata, void *value)
{
SDL_Hint *hint = (SDL_Hint *) value;
SDL_free(hint->value);
SDL_HintWatch *entry = hint->callbacks;
while (entry) {
SDL_HintWatch *freeable = entry;
entry = entry->next;
SDL_free(freeable);
}
SDL_free(hint);
}
static const char *GetHintEnvironmentVariable(const char *name)
{
const char *result = SDL_getenv(name);
if (!result && name && *name) {
// fall back to old (SDL2) names of environment variables that
// are important to users (e.g. many use SDL_VIDEODRIVER=wayland)
if (SDL_strcmp(name, SDL_HINT_VIDEO_DRIVER) == 0) {
result = SDL_getenv("SDL_VIDEODRIVER");
} else if (SDL_strcmp(name, SDL_HINT_AUDIO_DRIVER) == 0) {
result = SDL_getenv("SDL_AUDIODRIVER");
}
}
return result;
}
bool SDL_SetHintWithPriority(const char *name, const char *value, SDL_HintPriority priority)
{
CHECK_PARAM(!name || !*name) {
return SDL_InvalidParamError("name");
}
const char *env = GetHintEnvironmentVariable(name);
if (env && (priority < SDL_HINT_OVERRIDE)) {
return SDL_SetError("An environment variable is taking priority");
}
const SDL_PropertiesID hints = GetHintProperties(true);
if (!hints) {
return false;
}
bool result = false;
SDL_LockProperties(hints);
SDL_Hint *hint = (SDL_Hint *)SDL_GetPointerProperty(hints, name, NULL);
if (hint) {
if (priority >= hint->priority) {
if (hint->value != value && (!value || !hint->value || SDL_strcmp(hint->value, value) != 0)) {
char *old_value = hint->value;
hint->value = value ? SDL_strdup(value) : NULL;
SDL_HintWatch *entry = hint->callbacks;
while (entry) {
// Save the next entry in case this one is deleted
SDL_HintWatch *next = entry->next;
entry->callback(entry->userdata, name, old_value, value);
entry = next;
}
SDL_free(old_value);
}
hint->priority = priority;
result = true;
}
} else { // Couldn't find the hint? Add a new one.
hint = (SDL_Hint *)SDL_malloc(sizeof(*hint));
if (hint) {
hint->value = value ? SDL_strdup(value) : NULL;
hint->priority = priority;
hint->callbacks = NULL;
result = SDL_SetPointerPropertyWithCleanup(hints, name, hint, CleanupHintProperty, NULL);
}
}
#ifdef SDL_PLATFORM_ANDROID
if (SDL_strcmp(name, SDL_HINT_ANDROID_ALLOW_RECREATE_ACTIVITY) == 0) {
// Special handling for this hint, which needs to persist outside the normal application flow
Android_SetAllowRecreateActivity(SDL_GetStringBoolean(value, false));
}
#endif // SDL_PLATFORM_ANDROID
SDL_UnlockProperties(hints);
return result;
}
bool SDL_ResetHint(const char *name)
{
CHECK_PARAM(!name || !*name) {
return SDL_InvalidParamError("name");
}
const char *env = GetHintEnvironmentVariable(name);
const SDL_PropertiesID hints = GetHintProperties(false);
if (!hints) {
return false;
}
bool result = false;
SDL_LockProperties(hints);
SDL_Hint *hint = (SDL_Hint *)SDL_GetPointerProperty(hints, name, NULL);
if (hint) {
if ((!env && hint->value) || (env && !hint->value) || (env && SDL_strcmp(env, hint->value) != 0)) {
for (SDL_HintWatch *entry = hint->callbacks; entry;) {
// Save the next entry in case this one is deleted
SDL_HintWatch *next = entry->next;
entry->callback(entry->userdata, name, hint->value, env);
entry = next;
}
}
SDL_free(hint->value);
hint->value = NULL;
hint->priority = SDL_HINT_DEFAULT;
result = true;
}
#ifdef SDL_PLATFORM_ANDROID
if (SDL_strcmp(name, SDL_HINT_ANDROID_ALLOW_RECREATE_ACTIVITY) == 0) {
// Special handling for this hint, which needs to persist outside the normal application flow
if (env) {
Android_SetAllowRecreateActivity(SDL_GetStringBoolean(env, false));
} else {
Android_SetAllowRecreateActivity(false);
}
}
#endif // SDL_PLATFORM_ANDROID
SDL_UnlockProperties(hints);
return result;
}
static void SDLCALL ResetHintsCallback(void *userdata, SDL_PropertiesID hints, const char *name)
{
SDL_Hint *hint = (SDL_Hint *)SDL_GetPointerProperty(hints, name, NULL);
if (!hint) {
return; // uh...okay.
}
const char *env = GetHintEnvironmentVariable(name);
if ((!env && hint->value) || (env && !hint->value) || (env && SDL_strcmp(env, hint->value) != 0)) {
SDL_HintWatch *entry = hint->callbacks;
while (entry) {
// Save the next entry in case this one is deleted
SDL_HintWatch *next = entry->next;
entry->callback(entry->userdata, name, hint->value, env);
entry = next;
}
}
SDL_free(hint->value);
hint->value = NULL;
hint->priority = SDL_HINT_DEFAULT;
#ifdef SDL_PLATFORM_ANDROID
if (SDL_strcmp(name, SDL_HINT_ANDROID_ALLOW_RECREATE_ACTIVITY) == 0) {
// Special handling for this hint, which needs to persist outside the normal application flow
if (env) {
Android_SetAllowRecreateActivity(SDL_GetStringBoolean(env, false));
} else {
Android_SetAllowRecreateActivity(false);
}
}
#endif // SDL_PLATFORM_ANDROID
}
void SDL_ResetHints(void)
{
SDL_EnumerateProperties(GetHintProperties(false), ResetHintsCallback, NULL);
}
bool SDL_SetHint(const char *name, const char *value)
{
return SDL_SetHintWithPriority(name, value, SDL_HINT_NORMAL);
}
const char *SDL_GetHint(const char *name)
{
if (!name) {
return NULL;
}
const char *result = GetHintEnvironmentVariable(name);
const SDL_PropertiesID hints = GetHintProperties(false);
if (hints) {
SDL_LockProperties(hints);
SDL_Hint *hint = (SDL_Hint *)SDL_GetPointerProperty(hints, name, NULL);
if (hint) {
if (!result || hint->priority == SDL_HINT_OVERRIDE) {
result = SDL_GetPersistentString(hint->value);
}
}
SDL_UnlockProperties(hints);
}
return result;
}
int SDL_GetStringInteger(const char *value, int default_value)
{
if (!value || !*value) {
return default_value;
}
if (SDL_strcasecmp(value, "false") == 0) {
return 0;
}
if (SDL_strcasecmp(value, "true") == 0) {
return 1;
}
if (*value == '-' || SDL_isdigit(*value)) {
return SDL_atoi(value);
}
return default_value;
}
bool SDL_GetStringBoolean(const char *value, bool default_value)
{
if (!value || !*value) {
return default_value;
}
if (*value == '0' || SDL_strcasecmp(value, "false") == 0) {
return false;
}
return true;
}
bool SDL_GetHintBoolean(const char *name, bool default_value)
{
const char *hint = SDL_GetHint(name);
return SDL_GetStringBoolean(hint, default_value);
}
bool SDL_AddHintCallback(const char *name, SDL_HintCallback callback, void *userdata)
{
CHECK_PARAM(!name || !*name) {
return SDL_InvalidParamError("name");
}
CHECK_PARAM(!callback) {
return SDL_InvalidParamError("callback");
}
const SDL_PropertiesID hints = GetHintProperties(true);
if (!hints) {
return false;
}
SDL_HintWatch *entry = (SDL_HintWatch *)SDL_malloc(sizeof(*entry));
if (!entry) {
return false;
}
entry->callback = callback;
entry->userdata = userdata;
bool result = false;
SDL_LockProperties(hints);
SDL_RemoveHintCallback(name, callback, userdata);
SDL_Hint *hint = (SDL_Hint *)SDL_GetPointerProperty(hints, name, NULL);
if (hint) {
result = true;
} else { // Need to add a hint entry for this watcher
hint = (SDL_Hint *)SDL_malloc(sizeof(*hint));
if (!hint) {
SDL_free(entry);
SDL_UnlockProperties(hints);
return false;
} else {
hint->value = NULL;
hint->priority = SDL_HINT_DEFAULT;
hint->callbacks = NULL;
result = SDL_SetPointerPropertyWithCleanup(hints, name, hint, CleanupHintProperty, NULL);
}
}
// Add it to the callbacks for this hint
entry->next = hint->callbacks;
hint->callbacks = entry;
// Now call it with the current value
const char *value = SDL_GetHint(name);
callback(userdata, name, value, value);
SDL_UnlockProperties(hints);
return result;
}
void SDL_RemoveHintCallback(const char *name, SDL_HintCallback callback, void *userdata)
{
if (!name || !*name) {
return;
}
const SDL_PropertiesID hints = GetHintProperties(false);
if (!hints) {
return;
}
SDL_LockProperties(hints);
SDL_Hint *hint = (SDL_Hint *)SDL_GetPointerProperty(hints, name, NULL);
if (hint) {
SDL_HintWatch *prev = NULL;
for (SDL_HintWatch *entry = hint->callbacks; entry; entry = entry->next) {
if ((callback == entry->callback) && (userdata == entry->userdata)) {
if (prev) {
prev->next = entry->next;
} else {
hint->callbacks = entry->next;
}
SDL_free(entry);
break;
}
prev = entry;
}
}
SDL_UnlockProperties(hints);
}