1WAFFLE_CONTEXT(3)                Waffle Manual               WAFFLE_CONTEXT(3)
2
3
4

NAME

6       waffle_context, waffle_context_create, waffle_context_destroy,
7       waffle_context_get_native - class waffle_context
8

SYNOPSIS

10       #include <waffle.h>
11
12       struct waffle_context;
13
14
15       struct waffle_context*
16                                                    waffle_context_create(struct waffle_config *config,
17                                                    struct waffle_context *shared_ctx);
18
19       bool waffle_context_destroy(struct waffle_context *self);
20
21       union waffle_native_context*
22                                                              waffle_context_get_native(struct waffle_context *self);
23

DESCRIPTION

25       struct waffle_context
26           An opaque type.
27
28       waffle_context_create()
29           Create a context for OpenGL rendering with the properties specified
30           by config.
31
32           The returned context's actual properties may differ from, but are
33           guaranteed to be compatible with, the properties specified by
34           config. See the section called “VERSION PROMOTION” below for
35           details.
36
37           If share_ctx is not null, then the newly created context is added
38           to the share group of share_ctx. Some data, such as display lists,
39           are shared among all contexts that belong to the same share group.
40           For details on what data is shared, see the specification for the
41           relevant native platform: the GLX 1.4 Specification[1], the EGL 1.4
42           Specification[2], or the CGL Reference[3].
43
44       waffle_context_destroy()
45           Destroy the context and release its memory.
46
47       waffle_context_get_native()
48           Get the context's underlying native objects. Use free(3) to
49           deallocate the returned pointer. See waffle_native(3) for the
50           definition of union waffle_native_context.
51

VERSION PROMOTION

53       The context's requested version and profile is given by the config
54       attributes WAFFLE_CONTEXT_MAJOR_VERSION, WAFFLE_CONTEXT_MINOR_VERSION,
55       WAFFLE_CONTEXT_PROFILE. The context returned by waffle_context_create
56       may implement any version and profile that is backwards compatible with
57       that requested, as described below.
58
59       ·   If the chosen API is WAFFLE_OPENGL_ES1, WAFFLE_OPENGL_ES2, or
60           WAFFLE_OPENGL_ES3, then the returned context may implement any of:
61               * The requested version.
62               * Any later version, so long as no features have been from that
63               later version.
64
65       ·   If the chosen API is WAFFLE_CONTEXT_OPENGL and version 3.0 or less
66           is requested, then the returned context may implement any of:
67               * Any version no less than that requested and no greater than
68               3.0.
69               * Version 3.1, if the GL_ARB_compatibility extension is also
70               implemented.
71               * The compatibility profile of version 3.2 or greater.
72
73       ·   If the chosen API is WAFFLE_CONTEXT_OPENGL and version 3.1 is
74           requested, then the returned context may implement any of:
75               * Version 3.1, with or without the GL_ARB_compatibility
76               extension.
77               * The core profile of version 3.2 or greater.
78
79       ·   If the chosen API is WAFFLE_CONTEXT_OPENGL and version 3.2 or
80           greater is requested, then the returned context may implement any
81           of:
82               * The requested profile and version.
83               * The requested profile of any later version, so long as no
84               features have been from that later version and profile.
85
86

RETURN VALUE

88       Functions whose return type is bool return true on success and false on
89       failure. Functions whose return type is a pointer return NULL on
90       failure. Use waffle_error_get_info(3) to get information about any
91       errors.
92

ERRORS

94       See waffle_error(3) for the complete list of waffle's error codes.
95
96       No errors are specific to the waffle_context functions.
97

ISSUES

99       Please report bugs or and feature requests to
100       https://github.com/waffle-gl/waffle/issues.
101

SEE ALSO

103       waffle(7) waffle_config_choose(3)
104

AUTHOR

106       Chad Versace <chad.versace@linux.intel.com>
107           Maintainer
108

110       Copyright © 2013 Intel
111
112       This manual page is licensed under the Creative Commons
113       Attribution-ShareAlike 3.0 United States License (CC BY-SA 3.0). To
114       view a copy of this license, visit
115       http://creativecommons.org.license/by-sa/3.0/us.
116
117

NOTES

119        1. GLX 1.4 Specification
120           http://www.opengl.org/registry/doc/glx1.4.pdf
121
122        2. EGL 1.4 Specification
123           http://www.khronos.org/registry/egl/specs/eglspec.1.4.20110406.pdf
124
125        3. CGL Reference
126           https://developer.apple.com/library/mac/#documentation/graphicsimaging/reference/CGL_OpenGL/Reference/reference.html
127
128
129
130waffle                            07/27/2019                 WAFFLE_CONTEXT(3)
Impressum