1 /**************************************************************************
2 *
3 * Copyright 2008 VMware, Inc.
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 #include "c99_compat.h"
35
36 #include "egltypedefs.h"
37 #include "egldisplay.h"
38
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 /**
45 * "Base" class for device driver contexts.
46 */
47 struct _egl_context
48 {
49 /* A context is a display resource */
50 _EGLResource Resource;
51
52 /* The bound status of the context */
53 _EGLThreadInfo *Binding;
54 _EGLSurface *DrawSurface;
55 _EGLSurface *ReadSurface;
56
57 _EGLConfig *Config;
58
59 EGLint ClientAPI; /**< EGL_OPENGL_ES_API, EGL_OPENGL_API, EGL_OPENVG_API */
60 EGLint ClientMajorVersion;
61 EGLint ClientMinorVersion;
62 EGLint Flags;
63 EGLint Profile;
64 EGLint ResetNotificationStrategy;
65
66 /* The real render buffer when a window surface is bound */
67 EGLint WindowRenderBuffer;
68 };
69
70
71 extern EGLBoolean
72 _eglInitContext(_EGLContext *ctx, _EGLDisplay *dpy,
73 _EGLConfig *config, const EGLint *attrib_list);
74
75
76 extern EGLBoolean
77 _eglQueryContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *ctx, EGLint attribute, EGLint *value);
78
79
80 extern EGLBoolean
81 _eglBindContext(_EGLContext *ctx, _EGLSurface *draw, _EGLSurface *read,
82 _EGLContext **old_ctx,
83 _EGLSurface **old_draw, _EGLSurface **old_read);
84
85
86 /**
87 * Increment reference count for the context.
88 */
89 static inline _EGLContext *
_eglGetContext(_EGLContext * ctx)90 _eglGetContext(_EGLContext *ctx)
91 {
92 if (ctx)
93 _eglGetResource(&ctx->Resource);
94 return ctx;
95 }
96
97
98 /**
99 * Decrement reference count for the context.
100 */
101 static inline EGLBoolean
_eglPutContext(_EGLContext * ctx)102 _eglPutContext(_EGLContext *ctx)
103 {
104 return (ctx) ? _eglPutResource(&ctx->Resource) : EGL_FALSE;
105 }
106
107
108 /**
109 * Link a context to its display and return the handle of the link.
110 * The handle can be passed to client directly.
111 */
112 static inline EGLContext
_eglLinkContext(_EGLContext * ctx)113 _eglLinkContext(_EGLContext *ctx)
114 {
115 _eglLinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
116 return (EGLContext) ctx;
117 }
118
119
120 /**
121 * Unlink a linked context from its display.
122 * Accessing an unlinked context should generate EGL_BAD_CONTEXT error.
123 */
124 static inline void
_eglUnlinkContext(_EGLContext * ctx)125 _eglUnlinkContext(_EGLContext *ctx)
126 {
127 _eglUnlinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
128 }
129
130
131 /**
132 * Lookup a handle to find the linked context.
133 * Return NULL if the handle has no corresponding linked context.
134 */
135 static inline _EGLContext *
_eglLookupContext(EGLContext context,_EGLDisplay * dpy)136 _eglLookupContext(EGLContext context, _EGLDisplay *dpy)
137 {
138 _EGLContext *ctx = (_EGLContext *) context;
139 if (!dpy || !_eglCheckResource((void *) ctx, _EGL_RESOURCE_CONTEXT, dpy))
140 ctx = NULL;
141 return ctx;
142 }
143
144
145 /**
146 * Return the handle of a linked context, or EGL_NO_CONTEXT.
147 */
148 static inline EGLContext
_eglGetContextHandle(_EGLContext * ctx)149 _eglGetContextHandle(_EGLContext *ctx)
150 {
151 _EGLResource *res = (_EGLResource *) ctx;
152 return (res && _eglIsResourceLinked(res)) ?
153 (EGLContext) ctx : EGL_NO_CONTEXT;
154 }
155
156
157 #ifdef __cplusplus
158 }
159 #endif
160
161 #endif /* EGLCONTEXT_INCLUDED */
162