Re: [AD] X vsync emulation (timing)

[Chris <chris.kcat@xxxxxxxxxx>]

Peter Wang wrote:
> Chris wrote:
> > True.. but I think the timer should be designed so it attempts to 
> > increment at the speed of the reported refresh rate, instead of a flat 
> > 100Hz.
>
> How do you propose to do that?

Perhaps something along the lines of:

void x_retrace_proc(void)
{
   static u_int64_t x_vsync_hack = 0;
   static unsigned int last_retrace_count = 0;

   x_vsync_hack++;
   retrace_count = (unsigned int)(x_vsync_hack * 
(u_int64_t)refresh_rate / 100LL);

   if(retrace_count != last_retrace_count)
   {
      last_retrace_count = retrace_count;
      if(retrace_proc)
         retrace_proc();
   }
}

? You'd need to install that as a bg_func and make sure the timer that 
updates retrace_count is never installed, but it should work.