Hello,
I have made a program that draws zfail/zpass shadows. I draw three models with ~120 tris each and one light source and a simple floor, with zpass. I can get a full 60fps until the window size reaches about 780x580 which drops to around ~30 fps in a maximized window (1342x820). The application is far from cpu-bound and vsync is disabled. I was wondering if I am really hitting the 945GM fill rate limit, or I am doing something terribly costly someway along the way (this should not be the case, it is somewhat too simple). I have tried with the latest i915 in Debian and the latest i915tex from git (right after it got renamed to i915). The newer driver gives a steady ~20 fps, any window size, for my program and ~60 fps for glxgears. The render is divided into three passes: ambient, shadow volumes(front and back), "illuminate", nothing remarkable. I use VBOs, the performance is about the same as vertex arrays (added vbo support for the heck of it today). Some benchmarks at 1342x820, zpass: Skipping the front-polygon shadow volume pass: 35fps Skipping not drawing any polygons to the stencil buffer: 53fps Ambient pass only: 88fps Sample renders available at http://www.youtube.com/trektactoe Obviously, shoving the geometry down the pipeline twice is a slowdown, and so are the shadow volumes. Am I expecting too much from this chip ? Can I give a hand in profiling the driver ? Insight appreciated and welcome, Jonathan Bastien-Filiatrault ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
