Hi Brain, How is the RTT being implementated? Are you sure its FBO? Running use OSG_NOTIFY_LEVEL set to DEBUG will print out what path the OSG uses for implementing the FBO.
I have personally worked with FBO sizes way higher than window resolution, all the way up to 4k x 4k without problem. I must admit I have only done this with a full screen window, but I'd be very surprised if its any different.
From the description of the performance you a getting it I does kinda
sound like there issue with the OpenGL driver. Robert. On 24 Jan 2007 17:58:53 -0000, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Hi Robert, Actually, I have discovered what my problem was. On two of the machines that I was testing on, their window dimensions were 640x480. My original test machine was 512x512. When I changed my test machine to 640x480, I saw the same drop in FPS on it as well. To my knowledge, I am not modifying the size of the 512x512 textures, so I am curious as to why increasing my window dimensions from 512x512 to 640x480 would cause such a drastic frame rate drop. :? The only thing that I can think of would be that since the initial RTT texture is smaller than the actual window dimensions, this imposes a performance hit when the render to texture actually occurs. Of course, that's just a stab in the dark. Can you think of any suggestions that I could try to get my framerate back up? The final window dimensions will ultimately need to be full screen, but that kind of frame rate hit (~2-3 FPS) will just kill any usability. Even having just one floating point texture at 512x512 drops the frame rate to around 20FPS for a full screen app. BTW, the final texture for the RTT is being rendered at 512x512, not full screen. It is a secondary view. Thanks, Brian On Wed, 24 Jan 2007 09:13:51 +0000, "Robert Osfield" <[EMAIL PROTECTED]> wrote : > Hi Brian & Jeremy > > I know this doesn't help you guys, but for the record I used Linux > almost everyday for the past 5 years, running with various NVidia > hardware + drivers and haven't ever come across changes in performance > w..r.t first boot up vs continued use. > > So its certainly possible to have OpenGL running near flawlessly year > after year. > > But... there are dodgey drivers around and it sounds like you guys > have got them installed, the quickest way to establish a pattern is to > publish what drivers you are have a problem with and see if others are > having the same problem. Try upgrading or stepping back driver > versions. > > NVidia have a set of forums that you could look at. I can't recally > the address but google will find it for you. > > Robert. > _______________________________________________ > osg-users mailing list > [email protected] > http://openscenegraph.net/mailman/listinfo/osg-users > http://www.openscenegraph.org/ > > > _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
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