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b3rs3rk

Texture combiners VS Fragment Programs

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I dunno if this is usual or not, but to me it sounds strange. Some times ago i wrote a demo on dot3 bump mapping using textures combiners. In this demo the framerate was ~250 (i rendered only a single quad). Last week i re-wrote the demo using cg, but now the framerate is ~60! The scene is the same, the vertex and the pixel shaders are EXTREMELY simple (i only apply bump mapping, nothing more), so what's the problem? I'm working on a Athlon Xp 2600+ with a GeFo5700 256..

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a framerate of 60 sounds suspiciously like you have vsync enabled. this caps the framerate of your app to the refresh rate of the monitor. assuming you don't have an LCD and can thus muck about with the refresh rate of the monitor, try setting it to something else and see if your app speeds up. alternitevly, assuming you have some nice consumer graphcs card, disable vsync in the card settings place (typically buried somewhere in the desktop properties window thinger).

-me

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