1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.3.1"/>
<title>GLFW: Context handling</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
$(document).ready(function() { searchBox.OnSelectItem(0); });
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td style="padding-left: 0.5em;">
<div id="projectname">GLFW
 <span id="projectnumber">3.0.2</span>
</div>
<div id="projectbrief">A multi-platform library for OpenGL, window and input</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.3.1 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="index.html"><span>Main Page</span></a></li>
<li><a href="pages.html"><span>Related Pages</span></a></li>
<li><a href="modules.html"><span>Modules</span></a></li>
<li><a href="annotated.html"><span>Data Structures</span></a></li>
<li><a href="files.html"><span>Files</span></a></li>
<li>
<div id="MSearchBox" class="MSearchBoxInactive">
<span class="left">
<img id="MSearchSelect" src="search/mag_sel.png"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
alt=""/>
<input type="text" id="MSearchField" value="Search" accesskey="S"
onfocus="searchBox.OnSearchFieldFocus(true)"
onblur="searchBox.OnSearchFieldFocus(false)"
onkeyup="searchBox.OnSearchFieldChange(event)"/>
</span><span class="right">
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
</span>
</div>
</li>
</ul>
</div>
</div><!-- top -->
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Macros</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Groups</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Pages</a></div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0"
name="MSearchResults" id="MSearchResults">
</iframe>
</div>
<div class="header">
<div class="summary">
<a href="#typedef-members">Typedefs</a> |
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">Context handling</div> </div>
</div><!--header-->
<div class="contents">
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a>
Typedefs</h2></td></tr>
<tr class="memitem:gabf42b10edde1c4fc71e212e576b9f811"><td class="memItemLeft" align="right" valign="top">typedef void(* </td><td class="memItemRight" valign="bottom"><a class="el" href="group__context.html#gabf42b10edde1c4fc71e212e576b9f811">GLFWglproc</a> )(void)</td></tr>
<tr class="memdesc:gabf42b10edde1c4fc71e212e576b9f811"><td class="mdescLeft"> </td><td class="mdescRight">Client API function pointer type. <a href="#gabf42b10edde1c4fc71e212e576b9f811">More...</a><br/></td></tr>
<tr class="separator:gabf42b10edde1c4fc71e212e576b9f811"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga1c04dc242268f827290fe40aa1c91157"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__context.html#ga1c04dc242268f827290fe40aa1c91157">glfwMakeContextCurrent</a> (<a class="el" href="group__window.html#ga3c96d80d363e67d13a41b5d1821f3242">GLFWwindow</a> *window)</td></tr>
<tr class="memdesc:ga1c04dc242268f827290fe40aa1c91157"><td class="mdescLeft"> </td><td class="mdescRight">Makes the context of the specified window current for the calling thread. <a href="#ga1c04dc242268f827290fe40aa1c91157">More...</a><br/></td></tr>
<tr class="separator:ga1c04dc242268f827290fe40aa1c91157"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gac84759b1f6c2d271a4fea8ae89ec980d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__window.html#ga3c96d80d363e67d13a41b5d1821f3242">GLFWwindow</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__context.html#gac84759b1f6c2d271a4fea8ae89ec980d">glfwGetCurrentContext</a> (void)</td></tr>
<tr class="memdesc:gac84759b1f6c2d271a4fea8ae89ec980d"><td class="mdescLeft"> </td><td class="mdescRight">Returns the window whose context is current on the calling thread. <a href="#gac84759b1f6c2d271a4fea8ae89ec980d">More...</a><br/></td></tr>
<tr class="separator:gac84759b1f6c2d271a4fea8ae89ec980d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga15a5a1ee5b3c2ca6b15ca209a12efd14"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__context.html#ga15a5a1ee5b3c2ca6b15ca209a12efd14">glfwSwapBuffers</a> (<a class="el" href="group__window.html#ga3c96d80d363e67d13a41b5d1821f3242">GLFWwindow</a> *window)</td></tr>
<tr class="memdesc:ga15a5a1ee5b3c2ca6b15ca209a12efd14"><td class="mdescLeft"> </td><td class="mdescRight">Swaps the front and back buffers of the specified window. <a href="#ga15a5a1ee5b3c2ca6b15ca209a12efd14">More...</a><br/></td></tr>
<tr class="separator:ga15a5a1ee5b3c2ca6b15ca209a12efd14"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga6d4e0cdf151b5e579bd67f13202994ed"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__context.html#ga6d4e0cdf151b5e579bd67f13202994ed">glfwSwapInterval</a> (int interval)</td></tr>
<tr class="memdesc:ga6d4e0cdf151b5e579bd67f13202994ed"><td class="mdescLeft"> </td><td class="mdescRight">Sets the swap interval for the current context. <a href="#ga6d4e0cdf151b5e579bd67f13202994ed">More...</a><br/></td></tr>
<tr class="separator:ga6d4e0cdf151b5e579bd67f13202994ed"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga87425065c011cef1ebd6aac75e059dfa"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__context.html#ga87425065c011cef1ebd6aac75e059dfa">glfwExtensionSupported</a> (const char *extension)</td></tr>
<tr class="memdesc:ga87425065c011cef1ebd6aac75e059dfa"><td class="mdescLeft"> </td><td class="mdescRight">Returns whether the specified extension is available. <a href="#ga87425065c011cef1ebd6aac75e059dfa">More...</a><br/></td></tr>
<tr class="separator:ga87425065c011cef1ebd6aac75e059dfa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga35f1837e6f666781842483937612f163"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__context.html#gabf42b10edde1c4fc71e212e576b9f811">GLFWglproc</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__context.html#ga35f1837e6f666781842483937612f163">glfwGetProcAddress</a> (const char *procname)</td></tr>
<tr class="memdesc:ga35f1837e6f666781842483937612f163"><td class="mdescLeft"> </td><td class="mdescRight">Returns the address of the specified function for the current context. <a href="#ga35f1837e6f666781842483937612f163">More...</a><br/></td></tr>
<tr class="separator:ga35f1837e6f666781842483937612f163"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Typedef Documentation</h2>
<a class="anchor" id="gabf42b10edde1c4fc71e212e576b9f811"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">typedef void(* GLFWglproc)(void)</td>
</tr>
</table>
</div><div class="memdoc">
<p>Generic function pointer used for returning client API function pointers without forcing a cast from a regular pointer. </p>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ga87425065c011cef1ebd6aac75e059dfa"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int glfwExtensionSupported </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>extension</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>This function returns whether the specified <a class="el" href="context.html#context_glext">OpenGL or context creation API extension</a> is supported by the current context. For example, on Windows both the OpenGL and WGL extension strings are checked.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">extension</td><td>The ASCII encoded name of the extension. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>GL_TRUE</code> if the extension is available, or <code>GL_FALSE</code> otherwise.</dd></dl>
<dl class="section remark"><dt>Remarks</dt><dd>This function may be called from secondary threads.</dd></dl>
<dl class="section note"><dt>Note</dt><dd>As this functions searches one or more extension strings on each call, it is recommended that you cache its results if it's going to be used frequently. The extension strings will not change during the lifetime of a context, so there is no danger in doing this. </dd></dl>
</div>
</div>
<a class="anchor" id="gac84759b1f6c2d271a4fea8ae89ec980d"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group__window.html#ga3c96d80d363e67d13a41b5d1821f3242">GLFWwindow</a>* glfwGetCurrentContext </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>This function returns the window whose context is current on the calling thread.</p>
<dl class="section return"><dt>Returns</dt><dd>The window whose context is current, or <code>NULL</code> if no window's context is current.</dd></dl>
<dl class="section remark"><dt>Remarks</dt><dd>This function may be called from secondary threads.</dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="group__context.html#ga1c04dc242268f827290fe40aa1c91157" title="Makes the context of the specified window current for the calling thread.">glfwMakeContextCurrent</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ga35f1837e6f666781842483937612f163"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group__context.html#gabf42b10edde1c4fc71e212e576b9f811">GLFWglproc</a> glfwGetProcAddress </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>procname</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>This function returns the address of the specified <a class="el" href="context.html#context_glext">client API or extension function</a>, if it is supported by the current context.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">procname</td><td>The ASCII encoded name of the function. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The address of the function, or <code>NULL</code> if the function is unavailable.</dd></dl>
<dl class="section remark"><dt>Remarks</dt><dd>This function may be called from secondary threads.</dd></dl>
<dl class="section note"><dt>Note</dt><dd>The addresses of these functions are not guaranteed to be the same for all contexts, especially if they use different client APIs or even different context creation hints. </dd></dl>
</div>
</div>
<a class="anchor" id="ga1c04dc242268f827290fe40aa1c91157"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void glfwMakeContextCurrent </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__window.html#ga3c96d80d363e67d13a41b5d1821f3242">GLFWwindow</a> * </td>
<td class="paramname"><em>window</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>This function makes the context of the specified window current on the calling thread. A context can only be made current on a single thread at a time and each thread can have only a single current context at a time.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">window</td><td>The window whose context to make current, or <code>NULL</code> to detach the current context.</td></tr>
</table>
</dd>
</dl>
<dl class="section remark"><dt>Remarks</dt><dd>This function may be called from secondary threads.</dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="group__context.html#gac84759b1f6c2d271a4fea8ae89ec980d" title="Returns the window whose context is current on the calling thread.">glfwGetCurrentContext</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ga15a5a1ee5b3c2ca6b15ca209a12efd14"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void glfwSwapBuffers </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__window.html#ga3c96d80d363e67d13a41b5d1821f3242">GLFWwindow</a> * </td>
<td class="paramname"><em>window</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>This function swaps the front and back buffers of the specified window. If the swap interval is greater than zero, the GPU driver waits the specified number of screen updates before swapping the buffers.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">window</td><td>The window whose buffers to swap.</td></tr>
</table>
</dd>
</dl>
<dl class="section remark"><dt>Remarks</dt><dd>This function may be called from secondary threads.</dd></dl>
<dl class="section user"><dt>New in GLFW 3</dt><dd>This function no longer calls <a class="el" href="group__window.html#ga37bd57223967b4211d60ca1a0bf3c832">glfwPollEvents</a>. You need to call it or <a class="el" href="group__window.html#ga554e37d781f0a997656c26b2c56c835e">glfwWaitEvents</a> yourself.</dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="group__context.html#ga6d4e0cdf151b5e579bd67f13202994ed" title="Sets the swap interval for the current context.">glfwSwapInterval</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ga6d4e0cdf151b5e579bd67f13202994ed"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void glfwSwapInterval </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>interval</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>This function sets the swap interval for the current context, i.e. the number of screen updates to wait before swapping the buffers of a window and returning from <a class="el" href="group__context.html#ga15a5a1ee5b3c2ca6b15ca209a12efd14">glfwSwapBuffers</a>. This is sometimes called 'vertical synchronization', 'vertical retrace synchronization' or 'vsync'.</p>
<p>Contexts that support either of the <code>WGL_EXT_swap_control_tear</code> and <code>GLX_EXT_swap_control_tear</code> extensions also accept negative swap intervals, which allow the driver to swap even if a frame arrives a little bit late. You can check for the presence of these extensions using <a class="el" href="group__context.html#ga87425065c011cef1ebd6aac75e059dfa">glfwExtensionSupported</a>. For more information about swap tearing, see the extension specifications.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">interval</td><td>The minimum number of screen updates to wait for until the buffers are swapped by <a class="el" href="group__context.html#ga15a5a1ee5b3c2ca6b15ca209a12efd14">glfwSwapBuffers</a>.</td></tr>
</table>
</dd>
</dl>
<dl class="section remark"><dt>Remarks</dt><dd>This function may be called from secondary threads.</dd></dl>
<dl class="section note"><dt>Note</dt><dd>Some GPU drivers do not honor the requested swap interval, either because of user settings that override the request or due to bugs in the driver.</dd></dl>
<dl class="section see"><dt>See Also</dt><dd><a class="el" href="group__context.html#ga15a5a1ee5b3c2ca6b15ca209a12efd14" title="Swaps the front and back buffers of the specified window.">glfwSwapBuffers</a> </dd></dl>
</div>
</div>
</div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated on Sun Aug 25 2013 21:45:13 for GLFW by  <a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.3.1
</small></address>
</body>
</html>
|
