1 /**************************************************************************
3 * Copyright 2008 VMware, Inc.
4 * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
5 * Copyright 2010-2011 LunarG, Inc.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
28 **************************************************************************/
34 #include "eglconfig.h"
35 #include "eglcontext.h"
36 #include "egldisplay.h"
37 #include "eglcurrent.h"
38 #include "eglsurface.h"
40 #include "util/macros.h"
44 * Return the API bit (one of EGL_xxx_BIT) of the context.
47 _eglGetContextAPIBit(_EGLContext
*ctx
)
51 switch (ctx
->ClientAPI
) {
52 case EGL_OPENGL_ES_API
:
53 switch (ctx
->ClientMajorVersion
) {
55 bit
= EGL_OPENGL_ES_BIT
;
58 bit
= EGL_OPENGL_ES2_BIT
;
61 bit
= EGL_OPENGL_ES3_BIT_KHR
;
82 * Parse the list of context attributes and return the proper error code.
85 _eglParseContextAttribList(_EGLContext
*ctx
, _EGLDisplay
*dpy
,
86 const EGLint
*attrib_list
)
88 EGLenum api
= ctx
->ClientAPI
;
89 EGLint i
, err
= EGL_SUCCESS
;
94 if (api
== EGL_OPENVG_API
&& attrib_list
[0] != EGL_NONE
) {
95 _eglLog(_EGL_DEBUG
, "bad context attribute 0x%04x", attrib_list
[0]);
96 return EGL_BAD_ATTRIBUTE
;
99 for (i
= 0; attrib_list
[i
] != EGL_NONE
; i
++) {
100 EGLint attr
= attrib_list
[i
++];
101 EGLint val
= attrib_list
[i
];
104 case EGL_CONTEXT_CLIENT_VERSION
:
105 /* The EGL 1.4 spec says:
107 * "attribute EGL_CONTEXT_CLIENT_VERSION is only valid when the
108 * current rendering API is EGL_OPENGL_ES_API"
110 * The EGL_KHR_create_context spec says:
112 * "EGL_CONTEXT_MAJOR_VERSION_KHR 0x3098
113 * (this token is an alias for EGL_CONTEXT_CLIENT_VERSION)"
115 * "The values for attributes EGL_CONTEXT_MAJOR_VERSION_KHR and
116 * EGL_CONTEXT_MINOR_VERSION_KHR specify the requested client API
117 * version. They are only meaningful for OpenGL and OpenGL ES
118 * contexts, and specifying them for other types of contexts will
119 * generate an error."
121 if ((api
!= EGL_OPENGL_ES_API
&&
122 (!dpy
->Extensions
.KHR_create_context
|| api
!= EGL_OPENGL_API
))) {
123 err
= EGL_BAD_ATTRIBUTE
;
127 ctx
->ClientMajorVersion
= val
;
130 case EGL_CONTEXT_MINOR_VERSION_KHR
:
131 /* The EGL_KHR_create_context spec says:
133 * "The values for attributes EGL_CONTEXT_MAJOR_VERSION_KHR and
134 * EGL_CONTEXT_MINOR_VERSION_KHR specify the requested client API
135 * version. They are only meaningful for OpenGL and OpenGL ES
136 * contexts, and specifying them for other types of contexts will
137 * generate an error."
139 if (!dpy
->Extensions
.KHR_create_context
||
140 (api
!= EGL_OPENGL_ES_API
&& api
!= EGL_OPENGL_API
)) {
141 err
= EGL_BAD_ATTRIBUTE
;
145 ctx
->ClientMinorVersion
= val
;
148 case EGL_CONTEXT_FLAGS_KHR
:
149 if (!dpy
->Extensions
.KHR_create_context
) {
150 err
= EGL_BAD_ATTRIBUTE
;
154 /* The EGL_KHR_create_context spec says:
156 * "If the EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR flag bit is set in
157 * EGL_CONTEXT_FLAGS_KHR, then a <debug context> will be created.
159 * In some cases a debug context may be identical to a non-debug
160 * context. This bit is supported for OpenGL and OpenGL ES
163 if ((val
& EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR
) &&
164 (api
!= EGL_OPENGL_API
&& api
!= EGL_OPENGL_ES_API
)) {
165 err
= EGL_BAD_ATTRIBUTE
;
169 /* The EGL_KHR_create_context spec says:
171 * "If the EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR flag bit
172 * is set in EGL_CONTEXT_FLAGS_KHR, then a <forward-compatible>
173 * context will be created. Forward-compatible contexts are
174 * defined only for OpenGL versions 3.0 and later. They must not
175 * support functionality marked as <deprecated> by that version of
176 * the API, while a non-forward-compatible context must support
177 * all functionality in that version, deprecated or not. This bit
178 * is supported for OpenGL contexts, and requesting a
179 * forward-compatible context for OpenGL versions less than 3.0
180 * will generate an error."
182 if ((val
& EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR
) &&
183 (api
!= EGL_OPENGL_API
|| ctx
->ClientMajorVersion
< 3)) {
184 err
= EGL_BAD_ATTRIBUTE
;
188 if ((val
& EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR
) &&
189 api
!= EGL_OPENGL_API
) {
190 /* The EGL_KHR_create_context spec says:
192 * 10) Which error should be generated if robust buffer access
193 * or reset notifications are requested under OpenGL ES?
195 * As per Issue 6, this extension does not support creating
196 * robust contexts for OpenGL ES. This is only supported via
197 * the EGL_EXT_create_context_robustness extension.
199 * Attempting to use this extension to create robust OpenGL
200 * ES context will generate an EGL_BAD_ATTRIBUTE error. This
201 * specific error is generated because this extension does
202 * not define the EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR
203 * and EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR
204 * bits for OpenGL ES contexts. Thus, use of these bits fall
205 * under condition described by: "If an attribute is
206 * specified that is not meaningful for the client API
207 * type.." in the above specification.
209 * The spec requires that we emit the error even if the display
210 * supports EGL_EXT_create_context_robustness. To create a robust
211 * GLES context, the *attribute*
212 * EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT must be used, not the
213 * *flag* EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR.
215 err
= EGL_BAD_ATTRIBUTE
;
222 case EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR
:
223 if (!dpy
->Extensions
.KHR_create_context
) {
224 err
= EGL_BAD_ATTRIBUTE
;
228 /* The EGL_KHR_create_context spec says:
230 * "[EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR] is only meaningful for
231 * OpenGL contexts, and specifying it for other types of
232 * contexts, including OpenGL ES contexts, will generate an
235 if (api
!= EGL_OPENGL_API
) {
236 err
= EGL_BAD_ATTRIBUTE
;
243 case EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR
:
244 /* The EGL_KHR_create_context spec says:
246 * "[EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR] is only
247 * meaningful for OpenGL contexts, and specifying it for other
248 * types of contexts, including OpenGL ES contexts, will generate
251 if (!dpy
->Extensions
.KHR_create_context
252 || api
!= EGL_OPENGL_API
) {
253 err
= EGL_BAD_ATTRIBUTE
;
257 ctx
->ResetNotificationStrategy
= val
;
260 case EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT
:
261 /* The EGL_EXT_create_context_robustness spec says:
263 * "[EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT] is only
264 * meaningful for OpenGL ES contexts, and specifying it for other
265 * types of contexts will generate an EGL_BAD_ATTRIBUTE error."
267 if (!dpy
->Extensions
.EXT_create_context_robustness
268 || api
!= EGL_OPENGL_ES_API
) {
269 err
= EGL_BAD_ATTRIBUTE
;
273 ctx
->ResetNotificationStrategy
= val
;
276 case EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT
:
277 if (!dpy
->Extensions
.EXT_create_context_robustness
) {
278 err
= EGL_BAD_ATTRIBUTE
;
283 ctx
->Flags
|= EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR
;
286 case EGL_CONTEXT_OPENGL_ROBUST_ACCESS
:
287 if (dpy
->Version
< 15) {
288 err
= EGL_BAD_ATTRIBUTE
;
293 ctx
->Flags
|= EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR
;
296 case EGL_CONTEXT_OPENGL_DEBUG
:
297 if (dpy
->Version
< 15) {
298 err
= EGL_BAD_ATTRIBUTE
;
303 ctx
->Flags
|= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR
;
306 case EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE
:
307 if (dpy
->Version
< 15) {
308 err
= EGL_BAD_ATTRIBUTE
;
313 ctx
->Flags
|= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR
;
316 case EGL_CONTEXT_OPENGL_NO_ERROR_KHR
:
317 if (dpy
->Version
< 14 ||
318 !dpy
->Extensions
.KHR_create_context_no_error
) {
319 err
= EGL_BAD_ATTRIBUTE
;
323 /* The KHR_no_error spec only applies against OpenGL 2.0+ and
326 if ((api
!= EGL_OPENGL_API
&& api
!= EGL_OPENGL_ES_API
) ||
327 ctx
->ClientMajorVersion
< 2) {
328 err
= EGL_BAD_ATTRIBUTE
;
332 /* Canonicalize value to EGL_TRUE/EGL_FALSE definitions */
333 ctx
->NoError
= !!val
;
336 case EGL_CONTEXT_PRIORITY_LEVEL_IMG
:
337 /* The EGL_IMG_context_priority spec says:
339 * "EGL_CONTEXT_PRIORITY_LEVEL_IMG determines the priority level of
340 * the context to be created. This attribute is a hint, as an
341 * implementation may not support multiple contexts at some
342 * priority levels and system policy may limit access to high
343 * priority contexts to appropriate system privilege level. The
344 * default value for EGL_CONTEXT_PRIORITY_LEVEL_IMG is
345 * EGL_CONTEXT_PRIORITY_MEDIUM_IMG."
351 case EGL_CONTEXT_PRIORITY_HIGH_IMG
:
352 bit
= __EGL_CONTEXT_PRIORITY_HIGH_BIT
;
354 case EGL_CONTEXT_PRIORITY_MEDIUM_IMG
:
355 bit
= __EGL_CONTEXT_PRIORITY_MEDIUM_BIT
;
357 case EGL_CONTEXT_PRIORITY_LOW_IMG
:
358 bit
= __EGL_CONTEXT_PRIORITY_LOW_BIT
;
366 err
= EGL_BAD_ATTRIBUTE
;
370 /* "This extension allows an EGLContext to be created with a
371 * priority hint. It is possible that an implementation will not
372 * honour the hint, especially if there are constraints on the
373 * number of high priority contexts available in the system, or
374 * system policy limits access to high priority contexts to
375 * appropriate system privilege level. A query is provided to find
376 * the real priority level assigned to the context after creation."
378 * We currently assume that the driver applies the priority hint
379 * and filters out any it cannot handle during the screen setup,
380 * e.g. dri2_setup_screen(). As such we can mask any change that
381 * the driver would fail, and ctx->ContextPriority matches the
382 * hint applied to the driver/hardware backend.
384 if (dpy
->Extensions
.IMG_context_priority
& (1 << bit
))
385 ctx
->ContextPriority
= val
;
390 case EGL_CONTEXT_RELEASE_BEHAVIOR_KHR
:
391 if (val
== EGL_CONTEXT_RELEASE_BEHAVIOR_NONE_KHR
||
392 val
== EGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_KHR
) {
393 ctx
->ReleaseBehavior
= val
;
395 err
= EGL_BAD_ATTRIBUTE
;
400 err
= EGL_BAD_ATTRIBUTE
;
404 if (err
!= EGL_SUCCESS
) {
405 _eglLog(_EGL_DEBUG
, "bad context attribute 0x%04x", attr
);
410 if (api
== EGL_OPENGL_API
) {
411 /* The EGL_KHR_create_context spec says:
413 * "If the requested OpenGL version is less than 3.2,
414 * EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR is ignored and the
415 * functionality of the context is determined solely by the
416 * requested version."
418 * Since the value is ignored, only validate the setting if the version
421 if (ctx
->ClientMajorVersion
>= 4
422 || (ctx
->ClientMajorVersion
== 3 && ctx
->ClientMinorVersion
>= 2)) {
423 switch (ctx
->Profile
) {
424 case EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR
:
425 case EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR
:
429 /* The EGL_KHR_create_context spec says:
431 * "* If an OpenGL context is requested, the requested version
432 * is greater than 3.2, and the value for attribute
433 * EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR has no bits set; has
434 * any bits set other than EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR
435 * and EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR; has
436 * more than one of these bits set; or if the implementation does
437 * not support the requested profile, then an EGL_BAD_MATCH error
445 /* The EGL_KHR_create_context spec says:
447 * "* If an OpenGL context is requested and the values for
448 * attributes EGL_CONTEXT_MAJOR_VERSION_KHR and
449 * EGL_CONTEXT_MINOR_VERSION_KHR, when considered together with
450 * the value for attribute
451 * EGL_CONTEXT_FORWARD_COMPATIBLE_BIT_KHR, specify an OpenGL
452 * version and feature set that are not defined, than an
453 * EGL_BAD_MATCH error is generated.
455 * ... Thus, examples of invalid combinations of attributes
458 * - Major version < 1 or > 4
459 * - Major version == 1 and minor version < 0 or > 5
460 * - Major version == 2 and minor version < 0 or > 1
461 * - Major version == 3 and minor version < 0 or > 2
462 * - Major version == 4 and minor version < 0 or > 2
463 * - Forward-compatible flag set and major version < 3"
465 if (ctx
->ClientMajorVersion
< 1 || ctx
->ClientMinorVersion
< 0)
468 switch (ctx
->ClientMajorVersion
) {
470 if (ctx
->ClientMinorVersion
> 5
471 || (ctx
->Flags
& EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR
) != 0)
476 if (ctx
->ClientMinorVersion
> 1
477 || (ctx
->Flags
& EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR
) != 0)
482 /* Note: The text above is incorrect. There *is* an OpenGL 3.3!
484 if (ctx
->ClientMinorVersion
> 3)
490 /* Don't put additional version checks here. We don't know that
491 * there won't be versions > 4.2.
495 } else if (api
== EGL_OPENGL_ES_API
) {
496 /* The EGL_KHR_create_context spec says:
498 * "* If an OpenGL ES context is requested and the values for
499 * attributes EGL_CONTEXT_MAJOR_VERSION_KHR and
500 * EGL_CONTEXT_MINOR_VERSION_KHR specify an OpenGL ES version that
501 * is not defined, than an EGL_BAD_MATCH error is generated.
503 * ... Examples of invalid combinations of attributes include:
505 * - Major version < 1 or > 2
506 * - Major version == 1 and minor version < 0 or > 1
507 * - Major version == 2 and minor version != 0
509 if (ctx
->ClientMajorVersion
< 1 || ctx
->ClientMinorVersion
< 0)
512 switch (ctx
->ClientMajorVersion
) {
514 if (ctx
->ClientMinorVersion
> 1)
519 if (ctx
->ClientMinorVersion
> 0)
524 /* Don't put additional version checks here. We don't know that
525 * there won't be versions > 3.0.
535 switch (ctx
->ResetNotificationStrategy
) {
536 case EGL_NO_RESET_NOTIFICATION_KHR
:
537 case EGL_LOSE_CONTEXT_ON_RESET_KHR
:
541 err
= EGL_BAD_ATTRIBUTE
;
545 /* The EGL_KHR_create_context_no_error spec says:
547 * "BAD_MATCH is generated if the EGL_CONTEXT_OPENGL_NO_ERROR_KHR is TRUE at
548 * the same time as a debug or robustness context is specified."
550 if (ctx
->NoError
&& (ctx
->Flags
& EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR
||
551 ctx
->Flags
& EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR
)) {
555 if ((ctx
->Flags
& ~(EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR
556 | EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR
557 | EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR
)) != 0) {
558 err
= EGL_BAD_ATTRIBUTE
;
566 * Initialize the given _EGLContext object to defaults and/or the values
567 * in the attrib_list.
569 * According to EGL 1.5 Section 3.7:
571 * "EGL_OPENGL_API and EGL_OPENGL_ES_API are interchangeable for all
572 * purposes except eglCreateContext."
574 * And since we only support GL and GLES, this is the only place where the
575 * bound API matters at all. We look up the current API from the current
576 * thread, and stash that in the context we're initializing. Our caller is
577 * responsible for determining whether that's an API it supports.
580 _eglInitContext(_EGLContext
*ctx
, _EGLDisplay
*dpy
, _EGLConfig
*conf
,
581 const EGLint
*attrib_list
)
583 const EGLenum api
= eglQueryAPI();
587 return _eglError(EGL_BAD_MATCH
, "eglCreateContext(no client API)");
589 _eglInitResource(&ctx
->Resource
, sizeof(*ctx
), dpy
);
590 ctx
->ClientAPI
= api
;
592 ctx
->Profile
= EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR
;
594 ctx
->ClientMajorVersion
= 1; /* the default, per EGL spec */
595 ctx
->ClientMinorVersion
= 0;
597 ctx
->ResetNotificationStrategy
= EGL_NO_RESET_NOTIFICATION_KHR
;
598 ctx
->ContextPriority
= EGL_CONTEXT_PRIORITY_MEDIUM_IMG
;
599 ctx
->ReleaseBehavior
= EGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_KHR
;
601 err
= _eglParseContextAttribList(ctx
, dpy
, attrib_list
);
602 if (err
== EGL_SUCCESS
&& ctx
->Config
) {
605 api_bit
= _eglGetContextAPIBit(ctx
);
606 if (!(ctx
->Config
->RenderableType
& api_bit
)) {
607 _eglLog(_EGL_DEBUG
, "context api is 0x%x while config supports 0x%x",
608 api_bit
, ctx
->Config
->RenderableType
);
609 err
= EGL_BAD_CONFIG
;
612 if (err
!= EGL_SUCCESS
)
613 return _eglError(err
, "eglCreateContext");
620 _eglQueryContextRenderBuffer(_EGLContext
*ctx
)
622 _EGLSurface
*surf
= ctx
->DrawSurface
;
624 /* From the EGL 1.5 spec:
626 * - If the context is not bound to a surface, then EGL_NONE will be
632 switch (surf
->Type
) {
634 unreachable("bad EGLSurface type");
636 /* - If the context is bound to a pixmap surface, then EGL_SINGLE_BUFFER
639 return EGL_SINGLE_BUFFER
;
640 case EGL_PBUFFER_BIT
:
641 /* - If the context is bound to a pbuffer surface, then EGL_BACK_BUFFER
644 return EGL_BACK_BUFFER
;
646 /* - If the context is bound to a window surface, then either
647 * EGL_BACK_BUFFER or EGL_SINGLE_BUFFER may be returned. The value
648 * returned depends on both the buffer requested by the setting of the
649 * EGL_RENDER_BUFFER property of the surface [...], and on the client
650 * API (not all client APIs support single-buffer Rendering to window
651 * surfaces). Some client APIs allow control of whether rendering goes
652 * to the front or back buffer. This client API-specific choice is not
653 * reflected in the returned value, which only describes the buffer
654 * that will be rendered to by default if not overridden by the client
657 return surf
->ActiveRenderBuffer
;
663 _eglQueryContext(_EGLDriver
*drv
, _EGLDisplay
*dpy
, _EGLContext
*c
,
664 EGLint attribute
, EGLint
*value
)
670 return _eglError(EGL_BAD_PARAMETER
, "eglQueryContext");
675 * From EGL_KHR_no_config_context:
677 * "Querying EGL_CONFIG_ID returns the ID of the EGLConfig with
678 * respect to which the context was created, or zero if created
679 * without respect to an EGLConfig."
681 *value
= c
->Config
? c
->Config
->ConfigID
: 0;
683 case EGL_CONTEXT_CLIENT_VERSION
:
684 *value
= c
->ClientMajorVersion
;
686 case EGL_CONTEXT_CLIENT_TYPE
:
687 *value
= c
->ClientAPI
;
689 case EGL_RENDER_BUFFER
:
690 *value
= _eglQueryContextRenderBuffer(c
);
692 case EGL_CONTEXT_PRIORITY_LEVEL_IMG
:
693 *value
= c
->ContextPriority
;
696 return _eglError(EGL_BAD_ATTRIBUTE
, "eglQueryContext");
704 * Bind the context to the thread and return the previous context.
706 * Note that the context may be NULL.
709 _eglBindContextToThread(_EGLContext
*ctx
, _EGLThreadInfo
*t
)
713 oldCtx
= t
->CurrentContext
;
716 oldCtx
->Binding
= NULL
;
720 t
->CurrentContext
= ctx
;
728 * Return true if the given context and surfaces can be made current.
731 _eglCheckMakeCurrent(_EGLContext
*ctx
, _EGLSurface
*draw
, _EGLSurface
*read
)
733 _EGLThreadInfo
*t
= _eglGetCurrentThread();
736 if (_eglIsCurrentThreadDummy())
737 return _eglError(EGL_BAD_ALLOC
, "eglMakeCurrent");
742 return _eglError(EGL_BAD_MATCH
, "eglMakeCurrent");
746 dpy
= ctx
->Resource
.Display
;
747 if (!dpy
->Extensions
.KHR_surfaceless_context
748 && (draw
== NULL
|| read
== NULL
))
749 return _eglError(EGL_BAD_MATCH
, "eglMakeCurrent");
754 * "If ctx is current to some other thread, or if either draw or read are
755 * bound to contexts in another thread, an EGL_BAD_ACCESS error is
760 * "at most one context may be bound to a particular surface at a given
763 if (ctx
->Binding
&& ctx
->Binding
!= t
)
764 return _eglError(EGL_BAD_ACCESS
, "eglMakeCurrent");
765 if (draw
&& draw
->CurrentContext
&& draw
->CurrentContext
!= ctx
) {
766 if (draw
->CurrentContext
->Binding
!= t
)
767 return _eglError(EGL_BAD_ACCESS
, "eglMakeCurrent");
769 if (read
&& read
->CurrentContext
&& read
->CurrentContext
!= ctx
) {
770 if (read
->CurrentContext
->Binding
!= t
)
771 return _eglError(EGL_BAD_ACCESS
, "eglMakeCurrent");
774 /* If the context has a config then it must match that of the two
777 if ((draw
&& draw
->Config
!= ctx
->Config
) ||
778 (read
&& read
->Config
!= ctx
->Config
))
779 return _eglError(EGL_BAD_MATCH
, "eglMakeCurrent");
781 /* Otherwise we must be using the EGL_KHR_no_config_context
783 assert(dpy
->Extensions
.KHR_no_config_context
);
785 /* The extension doesn't permit binding draw and read buffers with
786 * differing contexts */
787 if (draw
&& read
&& draw
->Config
!= read
->Config
)
788 return _eglError(EGL_BAD_MATCH
, "eglMakeCurrent");
796 * Bind the context to the current thread and given surfaces. Return the
797 * previous bound context and surfaces. The caller should unreference the
798 * returned context and surfaces.
800 * Making a second call with the resources returned by the first call
801 * unsurprisingly undoes the first call, except for the resouce reference
805 _eglBindContext(_EGLContext
*ctx
, _EGLSurface
*draw
, _EGLSurface
*read
,
806 _EGLContext
**old_ctx
,
807 _EGLSurface
**old_draw
, _EGLSurface
**old_read
)
809 _EGLThreadInfo
*t
= _eglGetCurrentThread();
810 _EGLContext
*prev_ctx
;
811 _EGLSurface
*prev_draw
, *prev_read
;
813 if (!_eglCheckMakeCurrent(ctx
, draw
, read
))
816 /* increment refcounts before binding */
818 _eglGetSurface(draw
);
819 _eglGetSurface(read
);
821 /* bind the new context */
822 prev_ctx
= _eglBindContextToThread(ctx
, t
);
824 /* break previous bindings */
826 prev_draw
= prev_ctx
->DrawSurface
;
827 prev_read
= prev_ctx
->ReadSurface
;
830 prev_draw
->CurrentContext
= NULL
;
832 prev_read
->CurrentContext
= NULL
;
834 prev_ctx
->DrawSurface
= NULL
;
835 prev_ctx
->ReadSurface
= NULL
;
838 prev_draw
= prev_read
= NULL
;
841 /* establish new bindings */
844 draw
->CurrentContext
= ctx
;
846 read
->CurrentContext
= ctx
;
848 ctx
->DrawSurface
= draw
;
849 ctx
->ReadSurface
= read
;
852 assert(old_ctx
&& old_draw
&& old_read
);
854 *old_draw
= prev_draw
;
855 *old_read
= prev_read
;