Re: How do I sync output changes to vertical retrace?

[Mark Vojkovich]

On Mon, 13 Feb 2006, Barry Scott wrote:

 I have a text scrolling app that is not playing smoothly.

 Attempting to update the windows on a timer is not keeping my changes in
 sync with the monitors refresh. This is causing visual glitches.

 What mechanisms can I use to lock my changes to the monitor refresh rate?

  The only mechanism I know of is OpenGL.  Most OpenGL drivers have
a mechanism to allow buffer swapping at vblank.

 If I use DBE is it going to change the screen in the vertical blanking
 interval?


   No, it won't.  At least not in the XFree86/X.org implementations.


Mark.
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RE: Xlib : unexpected async reply

[Kaliraj Kalaichelvan - CTD, Chennai]

Have you tried using XInitThreads()

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf
Of [EMAIL PROTECTED]
Sent: Monday, February 13, 2006 11:35 AM
To: devel@xfree86.org
Subject: Xlib : unexpected async reply


   Iam buildin a kde Application that uses Xlib .
   Iam using  pthread_cond_wait() so that the running
   worker thread will wait untill the GUI thread give
   signal or finished his work .

  But suppose the worker thread blocked some X resources and waiting
  for the signal . If the next thread need those resources
  then there going to be problem .
  So in my case how will ensure that blocked working thread will
  release   all the X resources so that the GUI thread can
  use that X resources .I have used separate display connection
  for each thread .

 I pause the current pthread and invoke an dialog in
another thread the following error is coming
:
 Xlib : unexpected async reply
Xlib :sequence lost (0x1718e  0x71a0) in reply to 0x0!
X Error : BadImplementation (server does not implement opertaion) 17
 Major opcode : 20
 MInor opcode : 0
 Resource id  : 0x759d1
 The error is coming randomly , not always .
   Can any will help how to come out of this error .


Thanks

















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