void video_sync_all(void)
{
struct udevice *dev;
for (uclass_find_first_device(UCLASS_VIDEO, &dev);
dev;
uclass_find_next_device(&dev)) {
if (device_active(dev))
video_sync(dev);
}
}
int main(int argc, char *argv[])
{
Display *disp;
XVisualInfo *pvi;
XSetWindowAttributes swa;
int attrib[14];
GLint last_val = -1, count = 0;
Window winGL;
GLXContext context;
int dummy;
Atom wmDelete;
enum sync_type waitforsync = none;
int width = 500, height = 500, verbose = 0,
countonly = 0;
int c, i = 1;
opterr = 0;
while ((c = getopt(argc, argv, optstr)) != -1) {
switch (c) {
case 'w':
width = atoi(optarg);
break;
case 'h':
height = atoi(optarg);
break;
case 's':
switch (optarg[0]) {
case 'n':
waitforsync = none;
break;
case 's':
waitforsync = sgi_video_sync;
break;
case 'b':
waitforsync = buffer_swap;
break;
default:
usage(argv[0]);
break;
}
break;
case 'v':
verbose = 1;
break;
default:
usage(argv[0]);
break;
}
}
disp = XOpenDisplay(NULL);
if (!disp) {
fprintf(stderr, "failed to open display\n");
return -1;
}
if (!glXQueryExtension(disp, &dummy, &dummy)) {
fprintf(stderr, "glXQueryExtension failed\n");
return -1;
}
if (!GLXExtensionSupported(disp, "GLX_SGI_video_sync")) {
fprintf(stderr, "GLX_SGI_video_sync not supported, exiting\n");
return -1;
}
attrib[0] = GLX_RGBA;
attrib[1] = 1;
attrib[2] = GLX_RED_SIZE;
attrib[3] = 1;
attrib[4] = GLX_GREEN_SIZE;
attrib[5] = 1;
attrib[6] = GLX_BLUE_SIZE;
attrib[7] = 1;
if (waitforsync != buffer_swap)
attrib[8] = None;
else {
attrib[8] = GLX_DOUBLEBUFFER;
attrib[9] = 1;
attrib[10] = None;
}
pvi = glXChooseVisual(disp, DefaultScreen(disp), attrib);
if (!pvi) {
fprintf(stderr, "failed to choose visual, exiting\n");
return -1;
}
context = glXCreateContext(disp, pvi, None, GL_TRUE);
if (!context) {
fprintf(stderr, "failed to create glx context\n");
return -1;
}
pvi->screen = DefaultScreen(disp);
swa.colormap = XCreateColormap(disp, RootWindow(disp, pvi->screen),
pvi->visual, AllocNone);
swa.border_pixel = 0;
swa.event_mask = ExposureMask | KeyPressMask | ButtonPressMask |
StructureNotifyMask;
winGL = XCreateWindow(disp, RootWindow(disp, pvi->screen),
0, 0,
width, height,
0, pvi->depth, InputOutput, pvi->visual,
CWBorderPixel | CWColormap | CWEventMask, &swa);
if (!winGL) {
fprintf(stderr, "window creation failed\n");
return -1;
}
wmDelete = XInternAtom(disp, "WM_DELETE_WINDOW", True);
XSetWMProtocols(disp, winGL, &wmDelete, 1);
XSetStandardProperties(disp, winGL, "glsync test", "glsync text",
None, NULL, 0, NULL);
XMapRaised(disp, winGL);
glXMakeCurrent(disp, winGL, context);
video_sync_get = glXGetProcAddress((unsigned char *)"glXGetVideoSyncSGI");
video_sync = glXGetProcAddress((unsigned char *)"glXWaitVideoSyncSGI");
if (!video_sync_get || !video_sync) {
fprintf(stderr, "failed to get sync functions\n");
return -1;
}
video_sync_get(&count);
count++;
while (i++) {
/* Wait for vsync */
if (waitforsync == sgi_video_sync) {
if (verbose)
fprintf(stderr, "waiting on count %d\n", count);
video_sync(2, (count + 1) % 2, &count);
if (count < last_val)
fprintf(stderr, "error: vblank count went backwards: %d -> %d\n", last_val, count);
if (count == last_val)
fprintf(stderr, "error: count didn't change: %d\n", count);
last_val = count;
} else if (waitforsync == buffer_swap) {
glXSwapBuffers(disp, winGL);
}
if (countonly) {
video_sync(2, 1, &count);
fprintf(stderr, "current count: %d\n", count);
sleep(1);
continue;
}
/* Alternate colors to make tearing obvious */
if (i & 1)
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
else
glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
}
XDestroyWindow(disp, winGL);
glXDestroyContext(disp, context);
XCloseDisplay(disp);
return 0;
}
