1 /**************************************************************************
2 *
3 * Copyright 2009 VMware, Inc.
4 * Copyright 2008 VMware, Inc.
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28
29 #include <windows.h>
30
31 #define WGL_WGLEXT_PROTOTYPES
32
33 #include <GL/gl.h>
34 #include <GL/wglext.h>
35 #include "util/u_debug.h"
36 #include "stw_device.h"
37
38
39 /**
40 * Note that our implementation of swap intervals is a bit of a hack.
41 * We implement it based on querying the time and Sleep()'ing. We don't
42 * sync to the vblank.
43 */
44 WINGDIAPI BOOL APIENTRY
wglSwapIntervalEXT(int interval)45 wglSwapIntervalEXT(int interval)
46 {
47 if (interval < 0) {
48 SetLastError(ERROR_INVALID_DATA);
49 return FALSE;
50 }
51 if (stw_dev && !os_get_option("WGL_SWAP_INTERVAL")) {
52 stw_dev->swap_interval = interval;
53 }
54 return TRUE;
55 }
56
57
58 WINGDIAPI int APIENTRY
wglGetSwapIntervalEXT(void)59 wglGetSwapIntervalEXT(void)
60 {
61 return stw_dev ? stw_dev->swap_interval : 0;
62 }
63