1 /**************************************************************************
2 *
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.
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
31 #ifndef EGLCONTEXT_INCLUDED
32 #define EGLCONTEXT_INCLUDED
33
34
35 #include "egltypedefs.h"
36 #include "egldisplay.h"
37
38
39 /**
40 * "Base" class for device driver contexts.
41 */
42 struct _egl_context
43 {
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
61 /* The real render buffer when a window surface is bound */
62 EGLint WindowRenderBuffer;
63 };
64
65
66 PUBLIC EGLBoolean
67 _eglInitContext(_EGLContext *ctx, _EGLDisplay *dpy,
68 _EGLConfig *config, const EGLint *attrib_list);
69
70
71 extern EGLBoolean
72 _eglQueryContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *ctx, EGLint attribute, EGLint *value);
73
74
75 PUBLIC EGLBoolean
76 _eglBindContext(_EGLContext *ctx, _EGLSurface *draw, _EGLSurface *read,
77 _EGLContext **old_ctx,
78 _EGLSurface **old_draw, _EGLSurface **old_read);
79
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 /**
94 * Decrement reference count for the context.
95 */
96 static INLINE EGLBoolean
_eglPutContext(_EGLContext * ctx)97 _eglPutContext(_EGLContext *ctx)
98 {
99 return (ctx) ? _eglPutResource(&ctx->Resource) : EGL_FALSE;
100 }
101
102
103 /**
104 * Link a context to its display and return the handle of the link.
105 * The handle can be passed to client directly.
106 */
107 static INLINE EGLContext
_eglLinkContext(_EGLContext * ctx)108 _eglLinkContext(_EGLContext *ctx)
109 {
110 _eglLinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
111 return (EGLContext) ctx;
112 }
113
114
115 /**
116 * Unlink a linked context from its display.
117 * Accessing an unlinked context should generate EGL_BAD_CONTEXT error.
118 */
119 static INLINE void
_eglUnlinkContext(_EGLContext * ctx)120 _eglUnlinkContext(_EGLContext *ctx)
121 {
122 _eglUnlinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
123 }
124
125
126 /**
127 * Lookup a handle to find the linked context.
128 * Return NULL if the handle has no corresponding linked context.
129 */
130 static INLINE _EGLContext *
_eglLookupContext(EGLContext context,_EGLDisplay * dpy)131 _eglLookupContext(EGLContext context, _EGLDisplay *dpy)
132 {
133 _EGLContext *ctx = (_EGLContext *) context;
134 if (!dpy || !_eglCheckResource((void *) ctx, _EGL_RESOURCE_CONTEXT, dpy))
135 ctx = NULL;
136 return ctx;
137 }
138
139
140 /**
141 * Return the handle of a linked context, or EGL_NO_CONTEXT.
142 */
143 static INLINE EGLContext
_eglGetContextHandle(_EGLContext * ctx)144 _eglGetContextHandle(_EGLContext *ctx)
145 {
146 _EGLResource *res = (_EGLResource *) ctx;
147 return (res && _eglIsResourceLinked(res)) ?
148 (EGLContext) ctx : EGL_NO_CONTEXT;
149 }
150
151
152 #endif /* EGLCONTEXT_INCLUDED */
153