2 * Copyright © 2009 Intel Corporation
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5 * copy of this software and associated documentation files (the "Software"),
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21 * DEALINGS IN THE SOFTWARE.
26 * Sync object management.
28 * Unlike textures and other objects that are shared between contexts, sync
29 * objects are not bound to the context. As a result, the reference counting
30 * and delete behavior of sync objects is slightly different. References to
31 * sync objects are added:
33 * - By \c glFencSynce. This sets the initial reference count to 1.
34 * - At the start of \c glClientWaitSync. The reference is held for the
35 * duration of the wait call.
37 * References are removed:
39 * - By \c glDeleteSync.
40 * - At the end of \c glClientWaitSync.
42 * Additionally, drivers may call \c _mesa_ref_sync_object and
43 * \c _mesa_unref_sync_object as needed to implement \c ServerWaitSync.
45 * As with shader objects, sync object names become invalid as soon as
46 * \c glDeleteSync is called. For this reason \c glDeleteSync sets the
47 * \c DeletePending flag. All functions validate object handles by testing
51 * Only \c GL_ARB_sync objects are shared between contexts. If support is ever
52 * added for either \c GL_NV_fence or \c GL_APPLE_fence different semantics
53 * will need to be implemented.
55 * \author Ian Romanick <ian.d.romanick@intel.com>
62 #include "mfeatures.h"
70 static struct gl_sync_object
*
71 _mesa_new_sync_object(struct gl_context
*ctx
, GLenum type
)
73 struct gl_sync_object
*s
= MALLOC_STRUCT(gl_sync_object
);
82 _mesa_delete_sync_object(struct gl_context
*ctx
, struct gl_sync_object
*syncObj
)
90 _mesa_fence_sync(struct gl_context
*ctx
, struct gl_sync_object
*syncObj
,
91 GLenum condition
, GLbitfield flags
)
97 syncObj
->StatusFlag
= 1;
102 _mesa_check_sync(struct gl_context
*ctx
, struct gl_sync_object
*syncObj
)
107 /* No-op for software rendering. Hardware drivers will need to determine
108 * whether the state of the sync object has changed.
114 _mesa_wait_sync(struct gl_context
*ctx
, struct gl_sync_object
*syncObj
,
115 GLbitfield flags
, GLuint64 timeout
)
122 /* No-op for software rendering. Hardware drivers will need to wait until
123 * the state of the sync object changes or the timeout expires.
129 _mesa_init_sync_object_functions(struct dd_function_table
*driver
)
131 driver
->NewSyncObject
= _mesa_new_sync_object
;
132 driver
->FenceSync
= _mesa_fence_sync
;
133 driver
->DeleteSyncObject
= _mesa_delete_sync_object
;
134 driver
->CheckSync
= _mesa_check_sync
;
136 /* Use the same no-op wait function for both.
138 driver
->ClientWaitSync
= _mesa_wait_sync
;
139 driver
->ServerWaitSync
= _mesa_wait_sync
;
144 _mesa_init_sync_dispatch(struct _glapi_table
*disp
)
146 SET_IsSync(disp
, _mesa_IsSync
);
147 SET_DeleteSync(disp
, _mesa_DeleteSync
);
148 SET_FenceSync(disp
, _mesa_FenceSync
);
149 SET_ClientWaitSync(disp
, _mesa_ClientWaitSync
);
150 SET_WaitSync(disp
, _mesa_WaitSync
);
151 SET_GetInteger64v(disp
, _mesa_GetInteger64v
);
152 SET_GetSynciv(disp
, _mesa_GetSynciv
);
157 * Allocate/init the context state related to sync objects.
160 _mesa_init_sync(struct gl_context
*ctx
)
167 * Free the context state related to sync objects.
170 _mesa_free_sync_data(struct gl_context
*ctx
)
177 _mesa_validate_sync(struct gl_sync_object
*syncObj
)
179 return (syncObj
!= NULL
)
180 && (syncObj
->Type
== GL_SYNC_FENCE
)
181 && !syncObj
->DeletePending
;
186 _mesa_ref_sync_object(struct gl_context
*ctx
, struct gl_sync_object
*syncObj
)
188 _glthread_LOCK_MUTEX(ctx
->Shared
->Mutex
);
190 _glthread_UNLOCK_MUTEX(ctx
->Shared
->Mutex
);
195 _mesa_unref_sync_object(struct gl_context
*ctx
, struct gl_sync_object
*syncObj
)
197 _glthread_LOCK_MUTEX(ctx
->Shared
->Mutex
);
199 if (syncObj
->RefCount
== 0) {
200 remove_from_list(& syncObj
->link
);
201 _glthread_UNLOCK_MUTEX(ctx
->Shared
->Mutex
);
203 ctx
->Driver
.DeleteSyncObject(ctx
, syncObj
);
205 _glthread_UNLOCK_MUTEX(ctx
->Shared
->Mutex
);
211 _mesa_IsSync(GLsync sync
)
213 GET_CURRENT_CONTEXT(ctx
);
214 struct gl_sync_object
*const syncObj
= (struct gl_sync_object
*) sync
;
215 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
217 return _mesa_validate_sync(syncObj
) ? GL_TRUE
: GL_FALSE
;
222 _mesa_DeleteSync(GLsync sync
)
224 GET_CURRENT_CONTEXT(ctx
);
225 struct gl_sync_object
*const syncObj
= (struct gl_sync_object
*) sync
;
226 ASSERT_OUTSIDE_BEGIN_END(ctx
);
228 /* From the GL_ARB_sync spec:
230 * DeleteSync will silently ignore a <sync> value of zero. An
231 * INVALID_VALUE error is generated if <sync> is neither zero nor the
232 * name of a sync object.
238 if (!_mesa_validate_sync(syncObj
)) {
239 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glDeleteSync");
243 /* If there are no client-waits or server-waits pending on this sync, delete
244 * the underlying object.
246 syncObj
->DeletePending
= GL_TRUE
;
247 _mesa_unref_sync_object(ctx
, syncObj
);
252 _mesa_FenceSync(GLenum condition
, GLbitfield flags
)
254 GET_CURRENT_CONTEXT(ctx
);
255 struct gl_sync_object
*syncObj
;
256 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, 0);
258 if (condition
!= GL_SYNC_GPU_COMMANDS_COMPLETE
) {
259 _mesa_error(ctx
, GL_INVALID_ENUM
, "glFenceSync(condition=0x%x)",
265 _mesa_error(ctx
, GL_INVALID_VALUE
, "glFenceSync(flags=0x%x)",
270 syncObj
= ctx
->Driver
.NewSyncObject(ctx
, GL_SYNC_FENCE
);
271 if (syncObj
!= NULL
) {
272 syncObj
->Type
= GL_SYNC_FENCE
;
273 /* The name is not currently used, and it is never visible to
274 * applications. If sync support is extended to provide support for
275 * NV_fence, this field will be used. We'll also need to add an object
279 syncObj
->RefCount
= 1;
280 syncObj
->DeletePending
= GL_FALSE
;
281 syncObj
->SyncCondition
= condition
;
282 syncObj
->Flags
= flags
;
283 syncObj
->StatusFlag
= 0;
285 ctx
->Driver
.FenceSync(ctx
, syncObj
, condition
, flags
);
287 _glthread_LOCK_MUTEX(ctx
->Shared
->Mutex
);
288 insert_at_tail(& ctx
->Shared
->SyncObjects
, & syncObj
->link
);
289 _glthread_UNLOCK_MUTEX(ctx
->Shared
->Mutex
);
291 return (GLsync
) syncObj
;
299 _mesa_ClientWaitSync(GLsync sync
, GLbitfield flags
, GLuint64 timeout
)
301 GET_CURRENT_CONTEXT(ctx
);
302 struct gl_sync_object
*const syncObj
= (struct gl_sync_object
*) sync
;
304 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_WAIT_FAILED
);
306 if (!_mesa_validate_sync(syncObj
)) {
307 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glClientWaitSync");
308 return GL_WAIT_FAILED
;
311 if ((flags
& ~GL_SYNC_FLUSH_COMMANDS_BIT
) != 0) {
312 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClientWaitSync(flags=0x%x)", flags
);
313 return GL_WAIT_FAILED
;
316 _mesa_ref_sync_object(ctx
, syncObj
);
318 /* From the GL_ARB_sync spec:
320 * ClientWaitSync returns one of four status values. A return value of
321 * ALREADY_SIGNALED indicates that <sync> was signaled at the time
322 * ClientWaitSync was called. ALREADY_SIGNALED will always be returned
323 * if <sync> was signaled, even if the value of <timeout> is zero.
325 ctx
->Driver
.CheckSync(ctx
, syncObj
);
326 if (syncObj
->StatusFlag
) {
327 ret
= GL_ALREADY_SIGNALED
;
329 ctx
->Driver
.ClientWaitSync(ctx
, syncObj
, flags
, timeout
);
331 ret
= syncObj
->StatusFlag
? GL_CONDITION_SATISFIED
: GL_TIMEOUT_EXPIRED
;
334 _mesa_unref_sync_object(ctx
, syncObj
);
340 _mesa_WaitSync(GLsync sync
, GLbitfield flags
, GLuint64 timeout
)
342 GET_CURRENT_CONTEXT(ctx
);
343 struct gl_sync_object
*const syncObj
= (struct gl_sync_object
*) sync
;
344 ASSERT_OUTSIDE_BEGIN_END(ctx
);
346 if (!_mesa_validate_sync(syncObj
)) {
347 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glWaitSync");
352 _mesa_error(ctx
, GL_INVALID_ENUM
, "glWaitSync(flags=0x%x)", flags
);
356 /* From the GL_ARB_sync spec:
358 * If the value of <timeout> is zero, then WaitSync does nothing.
364 ctx
->Driver
.ServerWaitSync(ctx
, syncObj
, flags
, timeout
);
369 _mesa_GetSynciv(GLsync sync
, GLenum pname
, GLsizei bufSize
, GLsizei
*length
,
372 GET_CURRENT_CONTEXT(ctx
);
373 struct gl_sync_object
*const syncObj
= (struct gl_sync_object
*) sync
;
376 ASSERT_OUTSIDE_BEGIN_END(ctx
);
378 if (!_mesa_validate_sync(syncObj
)) {
379 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glGetSynciv");
385 v
[0] = syncObj
->Type
;
389 case GL_SYNC_CONDITION
:
390 v
[0] = syncObj
->SyncCondition
;
395 /* Update the state of the sync by dipping into the driver. Note that
396 * this call won't block. It just updates state in the common object
397 * data from the current driver state.
399 ctx
->Driver
.CheckSync(ctx
, syncObj
);
401 v
[0] = (syncObj
->StatusFlag
) ? GL_SIGNALED
: GL_UNSIGNALED
;
406 v
[0] = syncObj
->Flags
;
411 _mesa_error(ctx
, GL_INVALID_ENUM
, "glGetSynciv(pname=0x%x)\n", pname
);
416 const GLsizei copy_count
= MIN2(size
, bufSize
);
418 memcpy(values
, v
, sizeof(GLint
) * copy_count
);
421 if (length
!= NULL
) {
426 #endif /* FEATURE_ARB_sync */