[Mesa-dev] [Bug 54763] New: glCopyPixels dirties the context and all rendering is slower after that

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54763

             Bug #: 54763
           Summary: glCopyPixels dirties the context and all rendering is
                    slower after that
    Classification: Unclassified
           Product: Mesa
           Version: 8.0
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
        AssignedTo: mesa-dev at lists.freedesktop.org
        ReportedBy: daniel.van.vugt at canonical.com


I call glCopyPixels a couple of times briefly on startup and then never again.
The problem is that doing this makes all subsequent rendering much slower. If I
never call glCopyPixels on startup then rendering remains fast thereafter.

It seems glCopyPixels is modifying the context in a way that permanently
cripples later operations. The only possible cause I can see so far is:

src/mesa/main/drawpix.c: _mesa_CopyPixels:
   /* We're not using the current vertex program, and the driver may install
    * it's own.  Note: this may dirty some state.
    */
   _mesa_set_vp_override(ctx, GL_TRUE);

This seems to set a flag in the ctx which is never cleared.

Using Mesa 8.0.2 in Ubuntu 12.04

-- 
Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.