1 /**************************************************************************
3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
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"
43 * Return the API bit (one of EGL_xxx_BIT) of the context.
46 _eglGetContextAPIBit(_EGLContext
*ctx
)
50 switch (ctx
->ClientAPI
) {
51 case EGL_OPENGL_ES_API
:
52 switch (ctx
->ClientMajorVersion
) {
54 bit
= EGL_OPENGL_ES_BIT
;
57 bit
= EGL_OPENGL_ES2_BIT
;
78 * Parse the list of context attributes and return the proper error code.
81 _eglParseContextAttribList(_EGLContext
*ctx
, const EGLint
*attrib_list
)
83 EGLenum api
= ctx
->ClientAPI
;
84 EGLint i
, err
= EGL_SUCCESS
;
89 for (i
= 0; attrib_list
[i
] != EGL_NONE
; i
++) {
90 EGLint attr
= attrib_list
[i
++];
91 EGLint val
= attrib_list
[i
];
94 case EGL_CONTEXT_CLIENT_VERSION
:
95 if (api
!= EGL_OPENGL_ES_API
) {
96 err
= EGL_BAD_ATTRIBUTE
;
99 if (val
!= 1 && val
!= 2) {
100 err
= EGL_BAD_ATTRIBUTE
;
103 ctx
->ClientMajorVersion
= val
;
106 err
= EGL_BAD_ATTRIBUTE
;
110 if (err
!= EGL_SUCCESS
) {
111 _eglLog(_EGL_DEBUG
, "bad context attribute 0x%04x", attr
);
121 * Initialize the given _EGLContext object to defaults and/or the values
122 * in the attrib_list.
125 _eglInitContext(_EGLContext
*ctx
, _EGLDisplay
*dpy
, _EGLConfig
*conf
,
126 const EGLint
*attrib_list
)
128 const EGLenum api
= eglQueryAPI();
131 if (api
== EGL_NONE
) {
132 _eglError(EGL_BAD_MATCH
, "eglCreateContext(no client API)");
136 _eglInitResource(&ctx
->Resource
, sizeof(*ctx
), dpy
);
137 ctx
->ClientAPI
= api
;
139 ctx
->WindowRenderBuffer
= EGL_NONE
;
141 ctx
->ClientMajorVersion
= 1; /* the default, per EGL spec */
142 ctx
->ClientMinorVersion
= 0;
144 err
= _eglParseContextAttribList(ctx
, attrib_list
);
145 if (err
== EGL_SUCCESS
&& ctx
->Config
) {
148 api_bit
= _eglGetContextAPIBit(ctx
);
149 if (!(ctx
->Config
->RenderableType
& api_bit
)) {
150 _eglLog(_EGL_DEBUG
, "context api is 0x%x while config supports 0x%x",
151 api_bit
, ctx
->Config
->RenderableType
);
152 err
= EGL_BAD_CONFIG
;
155 if (err
!= EGL_SUCCESS
)
156 return _eglError(err
, "eglCreateContext");
163 _eglQueryContextRenderBuffer(_EGLContext
*ctx
)
165 _EGLSurface
*surf
= ctx
->DrawSurface
;
170 if (surf
->Type
== EGL_WINDOW_BIT
&& ctx
->WindowRenderBuffer
!= EGL_NONE
)
171 rb
= ctx
->WindowRenderBuffer
;
173 rb
= surf
->RenderBuffer
;
179 _eglQueryContext(_EGLDriver
*drv
, _EGLDisplay
*dpy
, _EGLContext
*c
,
180 EGLint attribute
, EGLint
*value
)
186 return _eglError(EGL_BAD_PARAMETER
, "eglQueryContext");
191 return _eglError(EGL_BAD_ATTRIBUTE
, "eglQueryContext");
192 *value
= c
->Config
->ConfigID
;
194 case EGL_CONTEXT_CLIENT_VERSION
:
195 *value
= c
->ClientMajorVersion
;
197 case EGL_CONTEXT_CLIENT_TYPE
:
198 *value
= c
->ClientAPI
;
200 case EGL_RENDER_BUFFER
:
201 *value
= _eglQueryContextRenderBuffer(c
);
204 return _eglError(EGL_BAD_ATTRIBUTE
, "eglQueryContext");
212 * Bind the context to the thread and return the previous context.
214 * Note that the context may be NULL.
217 _eglBindContextToThread(_EGLContext
*ctx
, _EGLThreadInfo
*t
)
223 _eglConvertApiToIndex(ctx
->ClientAPI
) : t
->CurrentAPIIndex
;
225 oldCtx
= t
->CurrentContexts
[apiIndex
];
228 oldCtx
->Binding
= NULL
;
232 t
->CurrentContexts
[apiIndex
] = ctx
;
240 * Return true if the given context and surfaces can be made current.
243 _eglCheckMakeCurrent(_EGLContext
*ctx
, _EGLSurface
*draw
, _EGLSurface
*read
)
245 _EGLThreadInfo
*t
= _eglGetCurrentThread();
249 if (_eglIsCurrentThreadDummy())
250 return _eglError(EGL_BAD_ALLOC
, "eglMakeCurrent");
255 return _eglError(EGL_BAD_MATCH
, "eglMakeCurrent");
259 dpy
= ctx
->Resource
.Display
;
260 if (!dpy
->Extensions
.KHR_surfaceless_context
261 && (draw
== NULL
|| read
== NULL
))
262 return _eglError(EGL_BAD_MATCH
, "eglMakeCurrent");
267 * "If ctx is current to some other thread, or if either draw or read are
268 * bound to contexts in another thread, an EGL_BAD_ACCESS error is
273 * "at most one context may be bound to a particular surface at a given
276 if (ctx
->Binding
&& ctx
->Binding
!= t
)
277 return _eglError(EGL_BAD_ACCESS
, "eglMakeCurrent");
278 if (draw
&& draw
->CurrentContext
&& draw
->CurrentContext
!= ctx
) {
279 if (draw
->CurrentContext
->Binding
!= t
||
280 draw
->CurrentContext
->ClientAPI
!= ctx
->ClientAPI
)
281 return _eglError(EGL_BAD_ACCESS
, "eglMakeCurrent");
283 if (read
&& read
->CurrentContext
&& read
->CurrentContext
!= ctx
) {
284 if (read
->CurrentContext
->Binding
!= t
||
285 read
->CurrentContext
->ClientAPI
!= ctx
->ClientAPI
)
286 return _eglError(EGL_BAD_ACCESS
, "eglMakeCurrent");
289 /* simply require the configs to be equal */
290 if ((draw
&& draw
->Config
!= ctx
->Config
) ||
291 (read
&& read
->Config
!= ctx
->Config
))
292 return _eglError(EGL_BAD_MATCH
, "eglMakeCurrent");
294 switch (ctx
->ClientAPI
) {
295 /* OpenGL and OpenGL ES are conflicting */
296 case EGL_OPENGL_ES_API
:
297 conflict_api
= EGL_OPENGL_API
;
300 conflict_api
= EGL_OPENGL_ES_API
;
307 if (conflict_api
>= 0 && _eglGetAPIContext(conflict_api
))
308 return _eglError(EGL_BAD_ACCESS
, "eglMakeCurrent");
315 * Bind the context to the current thread and given surfaces. Return the
316 * previous bound context and surfaces. The caller should unreference the
317 * returned context and surfaces.
319 * Making a second call with the resources returned by the first call
320 * unsurprisingly undoes the first call, except for the resouce reference
324 _eglBindContext(_EGLContext
*ctx
, _EGLSurface
*draw
, _EGLSurface
*read
,
325 _EGLContext
**old_ctx
,
326 _EGLSurface
**old_draw
, _EGLSurface
**old_read
)
328 _EGLThreadInfo
*t
= _eglGetCurrentThread();
329 _EGLContext
*prev_ctx
;
330 _EGLSurface
*prev_draw
, *prev_read
;
332 if (!_eglCheckMakeCurrent(ctx
, draw
, read
))
335 /* increment refcounts before binding */
337 _eglGetSurface(draw
);
338 _eglGetSurface(read
);
340 /* bind the new context */
341 prev_ctx
= _eglBindContextToThread(ctx
, t
);
343 /* break previous bindings */
345 prev_draw
= prev_ctx
->DrawSurface
;
346 prev_read
= prev_ctx
->ReadSurface
;
349 prev_draw
->CurrentContext
= NULL
;
351 prev_read
->CurrentContext
= NULL
;
353 prev_ctx
->DrawSurface
= NULL
;
354 prev_ctx
->ReadSurface
= NULL
;
357 prev_draw
= prev_read
= NULL
;
360 /* establish new bindings */
363 draw
->CurrentContext
= ctx
;
365 read
->CurrentContext
= ctx
;
367 ctx
->DrawSurface
= draw
;
368 ctx
->ReadSurface
= read
;
371 assert(old_ctx
&& old_draw
&& old_read
);
373 *old_draw
= prev_draw
;
374 *old_read
= prev_read
;