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Shader Efficiency

Started by Yratelev Mar 10, 2004 at 9:06 AM 1 reply 350+ views

Original Post

Mar 10, 2004 at 9:06 AM

Hi, Im just starting to learn how to do shaders and im wondering; how much of a performance loss do i have by using them, and where does this loss appear (setting different shaders, running shaders etc) can u ever build a shader as fast as the fixed function pipeline? Yratelev

superdeveloper

Mar 10, 2004 at 9:22 AM

Probably the same speed as the FVF if you do it right, but it''s likely the FVF will be a bit faster..

The PRO is that for maybe a 10% speed hit against the FVF, using shaders can produce *any* effects you want, whether it is a special transformation (reducing the need for buffer locks), or pixel operation that you cannot normally achieve using the FVF.

Muhammad Haggag

156

Muhammad Haggag

Mar 10, 2004 at 8:16 PM

- Modern ATI cards implement the Fixed-Function Pipeline using shaders. I'm not sure about the nVidia parts.

- Pre-GeforceFX GeForce cards that support shaders had dedicated hardware for FFP lighting. Using shaders to perform the *same* FFP functionality would be slower on these chips. Again, I'm not sure about the FX here.

Muhammad Haggag
Bitwise account: MHaggag -

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[edited by - Coder on March 10, 2004 9:17:22 PM]

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