On Mon, Apr 20, 2009 at 4:41 PM, Olaf Ruppert
>> I believe they turn off interrupts on vblank to save power.
O.K. I checked that. I get the vblank interrupt.
But it does not help, here is the code:
static void swap(void)
{
static char * device = "/dev/dri/card0";
static int fd = 0;
drm_wait_vblank_t blank;
int r = -1;
if (!fd) {
fd = open(device, O_RDWR);
if (fd < 0)
die ("dri: Could not open device");
}
blank.request.type = _DRM_VBLANK_RELATIVE;
blank.request.sequence = 1;
do {
r = ioctl(fd, DRM_IOCTL_WAIT_VBLANK, &blank);
blank.request.type &= ~_DRM_VBLANK_RELATIVE;
} while (r && errno == EINTR);
if (r)
die("vsync failed");
glXSwapBuffers(dpy,stage);
}
Thanks for your help.
olaf
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