1 /**************************************************************************
2 *
3 * Copyright 2008 VMware, Inc.
4 * Copyright 2009-2010 Chia-I Wu <[email protected]>
5 * Copyright 2010-2011 LunarG, Inc.
6 * All Rights Reserved.
7 *
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:
15 *
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
18 * of the Software.
19 *
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.
27 *
28 **************************************************************************/
29
30 #ifndef EGLCONTEXT_INCLUDED
31 #define EGLCONTEXT_INCLUDED
32
33 #include "egldisplay.h"
34 #include "egltypedefs.h"
35
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39
40 /**
41 * "Base" class for device driver contexts.
42 */
43 struct _egl_context {
44 /* A context is a display resource */
45 _EGLResource Resource;
46
47 /* The bound status of the context */
48 _EGLThreadInfo *Binding;
49 _EGLSurface *DrawSurface;
50 _EGLSurface *ReadSurface;
51
52 _EGLConfig *Config;
53
54 EGLint ClientAPI; /**< EGL_OPENGL_ES_API, EGL_OPENGL_API, EGL_OPENVG_API */
55 EGLint ClientMajorVersion;
56 EGLint ClientMinorVersion;
57 EGLint Flags;
58 EGLint Profile;
59 EGLint ResetNotificationStrategy;
60 EGLint ContextPriority;
61 EGLBoolean NoError;
62 EGLint ReleaseBehavior;
63 EGLBoolean Protected; /* EGL_EXT_protected_content */
64 };
65
66 extern EGLBoolean
67 _eglInitContext(_EGLContext *ctx, _EGLDisplay *disp, _EGLConfig *config,
68 _EGLContext *share_list, const EGLint *attrib_list);
69
70 extern EGLBoolean
71 _eglQueryContext(_EGLContext *ctx, EGLint attribute, EGLint *value);
72
73 extern EGLBoolean
74 _eglBindContext(_EGLContext *ctx, _EGLSurface *draw, _EGLSurface *read,
75 _EGLContext **old_ctx, _EGLSurface **old_draw,
76 _EGLSurface **old_read);
77
78 extern _EGLContext *
79 _eglBindContextToThread(_EGLContext *ctx, _EGLThreadInfo *t);
80
81 /**
82 * Increment reference count for the context.
83 */
84 static inline _EGLContext *
_eglGetContext(_EGLContext * ctx)85 _eglGetContext(_EGLContext *ctx)
86 {
87 if (ctx)
88 _eglGetResource(&ctx->Resource);
89 return ctx;
90 }
91
92 /**
93 * Decrement reference count for the context.
94 */
95 static inline EGLBoolean
_eglPutContext(_EGLContext * ctx)96 _eglPutContext(_EGLContext *ctx)
97 {
98 return (ctx) ? _eglPutResource(&ctx->Resource) : EGL_FALSE;
99 }
100
101 /**
102 * Link a context to its display and return the handle of the link.
103 * The handle can be passed to client directly.
104 */
105 static inline EGLContext
_eglLinkContext(_EGLContext * ctx)106 _eglLinkContext(_EGLContext *ctx)
107 {
108 _eglLinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
109 return (EGLContext)ctx;
110 }
111
112 /**
113 * Unlink a linked context from its display.
114 * Accessing an unlinked context should generate EGL_BAD_CONTEXT error.
115 */
116 static inline void
_eglUnlinkContext(_EGLContext * ctx)117 _eglUnlinkContext(_EGLContext *ctx)
118 {
119 _eglUnlinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
120 }
121
122 /**
123 * Lookup a handle to find the linked context.
124 * Return NULL if the handle has no corresponding linked context.
125 */
126 static inline _EGLContext *
_eglLookupContext(EGLContext context,_EGLDisplay * disp)127 _eglLookupContext(EGLContext context, _EGLDisplay *disp)
128 {
129 _EGLContext *ctx = (_EGLContext *)context;
130 if (!disp || !_eglCheckResource((void *)ctx, _EGL_RESOURCE_CONTEXT, disp))
131 ctx = NULL;
132 return ctx;
133 }
134
135 /**
136 * Return the handle of a linked context, or EGL_NO_CONTEXT.
137 */
138 static inline EGLContext
_eglGetContextHandle(_EGLContext * ctx)139 _eglGetContextHandle(_EGLContext *ctx)
140 {
141 _EGLResource *res = (_EGLResource *)ctx;
142 return (res && _eglIsResourceLinked(res)) ? (EGLContext)ctx : EGL_NO_CONTEXT;
143 }
144
145 #ifdef __cplusplus
146 }
147 #endif
148
149 #endif /* EGLCONTEXT_INCLUDED */
150