Hi there, lately I've been playing around with OpenGL framebuffer objects while trying out shadow mapping with GL. The FBO is thereby used to render depth values to a texture, which is later needed for shadowing.
When I attach renderbuffer objects or texture objects that have ~1000 pixel per dimension to the framebuffer object, the framerate is ~160 fps. However, in the range between 1009 to 1024 pixels per dimension, the performance drops to ~35 fps. For higher numbers of pixels (>=1025) the performance again goes up to ~160 fps. I've searched bugzilla and the ML archive for this, but haven't found anything. Also, the changelogs of the intel driver releases 2.8 and 2.9 do not seem to contain any related entries. I'm on a system with a Core2 Duo x64-64, and an Intel 945 graphics chip. My distribution is an up-to-date Fedora 11, with Intel's xorg graphics driver 2.7. Best regards, Thomas -- GnuPG: http://tdz.users.sourceforge.net/tdz.asc Fingerprint: 16FF F599 82F8 E5AA 18C6 5220 D9DA D7D4 4EF1 DF08 jsapigen - A free glue-code generator for Mozilla SpiderMonkey. See http://jsapigen.sourceforge.net for more information.
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