[EMAIL PROTECTED] wrote: > As list administrator, your authorization is requested for the > following mailing list posting: > > List: Mesa3d-dev@lists.sourceforge.net > From: [EMAIL PROTECTED] > Subject: Re: [Mesa3d-dev] glXSwapBuffers > Reason: Post by non-member to a members-only list > > At your convenience, visit: > > https://lists.sourceforge.net/lists/admindb/mesa3d-dev > > to approve or deny the request. > > > ------------------------------------------------------------------------ > > Subject: > Re: [Mesa3d-dev] glXSwapBuffers > From: > Ulrich Czekalla <[EMAIL PROTECTED]> > Date: > Tue, 23 Jan 2007 07:05:21 -0500 > To: > Brian Paul <[EMAIL PROTECTED]> > > To: > Brian Paul <[EMAIL PROTECTED]> > CC: > mesa3d-dev@lists.sourceforge.net > > > On Mon, Jan 22, 2007 at 12:42:52PM -0700, Brian Paul wrote: >> The viewport and scissor box are NOT supposed to effect SwapBuffers. >> I'm very suprised to hear that NVIDIA does what you say. >> > > Hmmm that's not what I wanted to hear ;-) > >> One work around would be this: >> >> glReadBuffer(GL_BACK); >> glDrawBuffer(GL_FRONT); >> glCopyPixels(0, 0, w, h, GL_COLOR); >> > > Yes I thought of this but I'm concerned it will be too slow. > > We also considered writing a glX extension to allow us to specify an offset > and clip region that would allow us to override the window position and > size reported to gl/glx. > > We're still hoping we can achieve the same thing by overriding various > gl/wgl calls without incurring a significant performance hit.
There is a Mesa extension, GLX_MESA_copy_sub_buffer that lets you swap (copy, actually) a sub-region, but I don't recall off-hand if the hardware drivers support it. The glCopyPixels approach should work with _any_ OpenGL implementation. -Brian ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
