2
* Copyright © 2007 Intel Corporation
4
* Permission is hereby granted, free of charge, to any person obtaining a
5
* copy of this software and associated documentation files (the "Software"),
6
* to deal in the Software without restriction, including without limitation
7
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
8
* and/or sell copies of the Software, and to permit persons to whom the
9
* Software is furnished to do so, subject to the following conditions:
11
* The above copyright notice and this permission notice (including the next
12
* paragraph) shall be included in all copies or substantial portions of the
15
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24
* Jesse Barnes <jesse.barnes@intel.com>
29
* The program is simple: it paints a window alternating colors (red &
30
* white) either as fast as possible or synchronized to vblank events
32
* If run normally, the program should display a window that exhibits
33
* significant tearing between red and white colors (e.g. you might get
34
* a "waterfall" effect of red and white horizontal bars).
36
* If run with the '-s b' option, the program should synchronize the
37
* window color changes with the vertical blank period, resulting in a
38
* window that looks orangish with a high frequency flicker (which may
39
* be invisible). If the window is moved to another screen, this
40
* property should be preserved. If the window spans two screens, it
41
* shouldn't tear on whichever screen most of the window is on; the
42
* portion on the other screen may show some tearing (like the
43
* waterfall effect above).
45
* Other options include '-w <width>' and '-h <height' to set the
55
#include <GL/glxext.h>
58
#include <X11/Xutil.h>
60
static PFNGLXGETVIDEOSYNCSGIPROC video_sync_get;
61
static PFNGLXSWAPINTERVALSGIPROC swap_interval;
62
static PFNGLXWAITVIDEOSYNCSGIPROC video_sync;
65
static int GLXExtensionSupported(Display *dpy, const char *extension)
67
const char *extensionsString, *pos;
69
extensionsString = glXQueryExtensionsString(dpy, DefaultScreen(dpy));
71
pos = strstr(extensionsString, extension);
73
if (pos != NULL && (pos == extensionsString || pos[-1] == ' ') &&
74
(pos[strlen(extension)] == ' ' || pos[strlen(extension)] == '\0'))
81
extern int optind, opterr, optopt;
82
static char optstr[] = "w:h:s:vi:";
90
static void usage(char *name)
92
printf("usage: %s [-w <width>] [-h <height>] [-s<sync method>] "
94
printf("\t-s<sync method>:\n");
95
printf("\t\tn: none\n");
96
printf("\t\ts: SGI video sync extension\n");
97
printf("\t\tb: buffer swap\n");
98
printf("\t-i<swap interval>\n");
99
printf("\t-v: verbose (print count)\n");
103
int main(int argc, char *argv[])
107
XSetWindowAttributes swa;
109
unsigned int count = 0;
114
enum sync_type waitforsync = none;
115
int width = 500, height = 500, verbose = 0, interval = 1;
118
int attribs[] = { GLX_RGBA,
123
int db_attribs[] = { GLX_RGBA,
130
XSizeHints sizehints;
133
while ((c = getopt(argc, argv, optstr)) != -1) {
136
width = atoi(optarg);
139
height = atoi(optarg);
147
waitforsync = sgi_video_sync;
150
waitforsync = buffer_swap;
161
interval = atoi(optarg);
169
disp = XOpenDisplay(NULL);
171
fprintf(stderr, "failed to open display\n");
175
if (!glXQueryExtension(disp, &dummy, &dummy)) {
176
fprintf(stderr, "glXQueryExtension failed\n");
180
if (!GLXExtensionSupported(disp, "GLX_SGI_video_sync")) {
181
fprintf(stderr, "GLX_SGI_video_sync not supported, exiting\n");
185
if (waitforsync != buffer_swap) {
186
pvi = glXChooseVisual(disp, DefaultScreen(disp), attribs);
188
pvi = glXChooseVisual(disp, DefaultScreen(disp), db_attribs);
192
fprintf(stderr, "failed to choose visual, exiting\n");
196
pvi->screen = DefaultScreen(disp);
198
swa.colormap = XCreateColormap(disp, RootWindow(disp, pvi->screen),
199
pvi->visual, AllocNone);
200
swa.border_pixel = 0;
201
swa.event_mask = ExposureMask | KeyPressMask | ButtonPressMask |
203
winGL = XCreateWindow(disp, RootWindow(disp, pvi->screen),
206
0, pvi->depth, InputOutput, pvi->visual,
207
CWBorderPixel | CWColormap | CWEventMask, &swa);
209
fprintf(stderr, "window creation failed\n");
212
wmDelete = XInternAtom(disp, "WM_DELETE_WINDOW", True);
213
XSetWMProtocols(disp, winGL, &wmDelete, 1);
217
sizehints.width = width;
218
sizehints.height = height;
219
sizehints.flags = USSize | USPosition;
221
XSetNormalHints(disp, winGL, &sizehints);
222
XSetStandardProperties(disp, winGL, "glsync test", "glsync text",
223
None, NULL, 0, &sizehints);
225
context = glXCreateContext(disp, pvi, NULL, GL_TRUE);
227
fprintf(stderr, "failed to create glx context\n");
231
XMapWindow(disp, winGL);
232
ret = glXMakeCurrent(disp, winGL, context);
234
fprintf(stderr, "failed to make context current: %d\n", ret);
237
video_sync_get = (PFNGLXGETVIDEOSYNCSGIPROC) glXGetProcAddress((unsigned char *)"glXGetVideoSyncSGI");
238
video_sync = (PFNGLXWAITVIDEOSYNCSGIPROC) glXGetProcAddress((unsigned char *)"glXWaitVideoSyncSGI");
240
swap_interval = (PFNGLXSWAPINTERVALSGIPROC) glXGetProcAddress((unsigned char *)"glXSwapIntervalSGI");
242
if (!video_sync_get || !video_sync || !swap_interval) {
243
fprintf(stderr, "failed to get sync functions\n");
247
if (waitforsync == buffer_swap) {
248
swap_interval(interval);
249
fprintf(stderr, "set swap interval to %d\n", interval);
251
video_sync_get(&count);
253
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
255
/* Alternate colors to make tearing obvious */
257
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
258
glColor3f(1.0f, 1.0f, 1.0f);
260
glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
261
glColor3f(1.0f, 0.0f, 0.0f);
264
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
265
glRectf(0, 0, width, height);
268
if (waitforsync == sgi_video_sync) {
270
fprintf(stderr, "waiting on count %d\n", count);
271
video_sync(2, (count + 1) % 2, &count);
272
if (count < last_val)
273
fprintf(stderr, "error: vblank count went backwards: %d -> %d\n", last_val, count);
274
if (count == last_val)
275
fprintf(stderr, "error: count didn't change: %d\n", count);
278
} else if (waitforsync == buffer_swap) {
279
glXSwapBuffers(disp, winGL);
281
video_sync_get(&count);
287
video_sync_get(&count);
288
fprintf(stderr, "current count: %d\n", count);
292
XDestroyWindow(disp, winGL);
293
glXDestroyContext(disp, context);
added
removed
src/xdemos/glsync.c
