summaryrefslogtreecommitdiff
path: root/src/egl/main/eglcurrent.c
blob: 4221a9be3e1307d95027b040e12f154b686e4dff (plain)
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
#include <stdlib.h>
#include <string.h>
#include "egllog.h"
#include "eglmutex.h"
#include "eglcurrent.h"
#include "eglglobals.h"


/* This should be kept in sync with _eglInitThreadInfo() */
#define _EGL_THREAD_INFO_INITIALIZER \
   { EGL_SUCCESS, { NULL }, 0 }

/* a fallback thread info to guarantee that every thread always has one */
static _EGLThreadInfo dummy_thread = _EGL_THREAD_INFO_INITIALIZER;


#if PTHREADS
#include <pthread.h>

static _EGL_DECLARE_MUTEX(_egl_TSDMutex);
static EGLBoolean _egl_TSDInitialized;
static pthread_key_t _egl_TSD;
static void (*_egl_FreeTSD)(_EGLThreadInfo *);

#ifdef GLX_USE_TLS
static __thread const _EGLThreadInfo *_egl_TLS
   __attribute__ ((tls_model("initial-exec")));
#endif

static INLINE void _eglSetTSD(const _EGLThreadInfo *t)
{
   pthread_setspecific(_egl_TSD, (const void *) t);
#ifdef GLX_USE_TLS
   _egl_TLS = t;
#endif
}

static INLINE _EGLThreadInfo *_eglGetTSD(void)
{
#ifdef GLX_USE_TLS
   return (_EGLThreadInfo *) _egl_TLS;
#else
   return (_EGLThreadInfo *) pthread_getspecific(_egl_TSD);
#endif
}

static INLINE void _eglFiniTSD(void)
{
   _eglLockMutex(&_egl_TSDMutex);
   if (_egl_TSDInitialized) {
      _EGLThreadInfo *t = _eglGetTSD();

      _egl_TSDInitialized = EGL_FALSE;
      if (t && _egl_FreeTSD)
         _egl_FreeTSD((void *) t);
      pthread_key_delete(_egl_TSD);
   }
   _eglUnlockMutex(&_egl_TSDMutex);
}

static INLINE EGLBoolean _eglInitTSD(void (*dtor)(_EGLThreadInfo *))
{
   if (!_egl_TSDInitialized) {
      _eglLockMutex(&_egl_TSDMutex);

      /* check again after acquiring lock */
      if (!_egl_TSDInitialized) {
         if (pthread_key_create(&_egl_TSD, (void (*)(void *)) dtor) != 0) {
            _eglUnlockMutex(&_egl_TSDMutex);
            return EGL_FALSE;
         }
         _egl_FreeTSD = dtor;
         _eglAddAtExitCall(_eglFiniTSD);
         _egl_TSDInitialized = EGL_TRUE;
      }

      _eglUnlockMutex(&_egl_TSDMutex);
   }

   return EGL_TRUE;
}

#else /* PTHREADS */
static const _EGLThreadInfo *_egl_TSD;
static void (*_egl_FreeTSD)(_EGLThreadInfo *);

static INLINE void _eglSetTSD(const _EGLThreadInfo *t)
{
   _egl_TSD = t;
}

static INLINE _EGLThreadInfo *_eglGetTSD(void)
{
   return (_EGLThreadInfo *) _egl_TSD;
}

static INLINE void _eglFiniTSD(void)
{
   if (_egl_FreeTSD && _egl_TSD)
      _egl_FreeTSD((_EGLThreadInfo *) _egl_TSD);
}

static INLINE EGLBoolean _eglInitTSD(void (*dtor)(_EGLThreadInfo *))
{
   if (!_egl_FreeTSD && dtor) {
      _egl_FreeTSD = dtor;
      _eglAddAtExitCall(_eglFiniTSD);
   }
   return EGL_TRUE;
}

#endif /* !PTHREADS */


static void
_eglInitThreadInfo(_EGLThreadInfo *t)
{
   memset(t, 0, sizeof(*t));
   t->LastError = EGL_SUCCESS;
   /* default, per EGL spec */
   t->CurrentAPIIndex = _eglConvertApiToIndex(EGL_OPENGL_ES_API);
}


/**
 * Allocate and init a new _EGLThreadInfo object.
 */
static _EGLThreadInfo *
_eglCreateThreadInfo(void)
{
   _EGLThreadInfo *t = (_EGLThreadInfo *) calloc(1, sizeof(_EGLThreadInfo));
   if (t)
      _eglInitThreadInfo(t);
   else
      t = &dummy_thread;
   return t;
}


/**
 * Delete/free a _EGLThreadInfo object.
 */
static void
_eglDestroyThreadInfo(_EGLThreadInfo *t)
{
   if (t != &dummy_thread)
      free(t);
}


/**
 * Make sure TSD is initialized and return current value.
 */
static INLINE _EGLThreadInfo *
_eglCheckedGetTSD(void)
{
   if (_eglInitTSD(&_eglDestroyThreadInfo) != EGL_TRUE) {
      _eglLog(_EGL_FATAL, "failed to initialize \"current\" system");
      return NULL;
   }

   return _eglGetTSD();
}


/**
 * Return the calling thread's thread info.
 * If the calling thread nevers calls this function before, or if its thread
 * info was destroyed, a new one is created.  This function never returns NULL.
 * In the case allocation fails, a dummy one is returned.  See also
 * _eglIsCurrentThreadDummy.
 */
_EGLThreadInfo *
_eglGetCurrentThread(void)
{
   _EGLThreadInfo *t = _eglCheckedGetTSD();
   if (!t) {
      t = _eglCreateThreadInfo();
      _eglSetTSD(t);
   }

   return t;
}


/**
 * Destroy the calling thread's thread info.
 */
void
_eglDestroyCurrentThread(void)
{
   _EGLThreadInfo *t = _eglCheckedGetTSD();
   if (t) {
      _eglDestroyThreadInfo(t);
      _eglSetTSD(NULL);
   }
}


/**
 * Return true if the calling thread's thread info is dummy.
 * A dummy thread info is shared by all threads and should not be modified.
 * Functions like eglBindAPI or eglMakeCurrent should check for dummy-ness
 * before updating the thread info.
 */
EGLBoolean
_eglIsCurrentThreadDummy(void)
{
   _EGLThreadInfo *t = _eglCheckedGetTSD();
   return (!t || t == &dummy_thread);
}


/**
 * Return the currently bound context of the given API, or NULL.
 */
PUBLIC _EGLContext *
_eglGetAPIContext(EGLenum api)
{
   _EGLThreadInfo *t = _eglGetCurrentThread();
   return t->CurrentContexts[_eglConvertApiToIndex(api)];
}


/**
 * Return the currently bound context of the current API, or NULL.
 */
_EGLContext *
_eglGetCurrentContext(void)
{
   _EGLThreadInfo *t = _eglGetCurrentThread();
   return t->CurrentContexts[t->CurrentAPIIndex];
}


/**
 * Record EGL error code and return EGL_FALSE.
 */
EGLBoolean
_eglError(EGLint errCode, const char *msg)
{
   _EGLThreadInfo *t = _eglGetCurrentThread();

   if (t == &dummy_thread)
      return EGL_FALSE;

   t->LastError = errCode;

   if (errCode != EGL_SUCCESS) {
      const char *s;

      switch (errCode) {
      case EGL_BAD_ACCESS:
         s = "EGL_BAD_ACCESS";
         break;
      case EGL_BAD_ALLOC:
         s = "EGL_BAD_ALLOC";
         break;
      case EGL_BAD_ATTRIBUTE:
         s = "EGL_BAD_ATTRIBUTE";
         break;
      case EGL_BAD_CONFIG:
         s = "EGL_BAD_CONFIG";
         break;
      case EGL_BAD_CONTEXT:
         s = "EGL_BAD_CONTEXT";
         break;
      case EGL_BAD_CURRENT_SURFACE:
         s = "EGL_BAD_CURRENT_SURFACE";
         break;
      case EGL_BAD_DISPLAY:
         s = "EGL_BAD_DISPLAY";
         break;
      case EGL_BAD_MATCH:
         s = "EGL_BAD_MATCH";
         break;
      case EGL_BAD_NATIVE_PIXMAP:
         s = "EGL_BAD_NATIVE_PIXMAP";
         break;
      case EGL_BAD_NATIVE_WINDOW:
         s = "EGL_BAD_NATIVE_WINDOW";
         break;
      case EGL_BAD_PARAMETER:
         s = "EGL_BAD_PARAMETER";
         break;
      case EGL_BAD_SURFACE:
         s = "EGL_BAD_SURFACE";
         break;
      case EGL_NOT_INITIALIZED:
         s = "EGL_NOT_INITIALIZED";
         break;
#ifdef EGL_MESA_screen_surface
      case EGL_BAD_SCREEN_MESA:
         s = "EGL_BAD_SCREEN_MESA";
         break;
      case EGL_BAD_MODE_MESA:
         s = "EGL_BAD_MODE_MESA";
         break;
#endif
      default:
         s = "other EGL error";
      }
      _eglLog(_EGL_DEBUG, "EGL user error 0x%x (%s) in %s\n", errCode, s, msg);
   }

   return EGL_FALSE;
}