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GLSL Noise Performance

Started by hitman200ca Sep 22, 2005 at 9:55 PM 3 replies 4.8k views

Original Post

Sep 22, 2005 at 9:55 PM

Hello, Has anyone experimented with any of the noise family of functions in GLSL? I am finding that they are not implemented or poorly implemented. This document by Mark Kilgard notes that noise on NVidia cards returns 0 always. http://download.nvidia.com/developer/Papers/2005/OpenGL_2.0/NVIDIA_OpenGL_2.0_Support.pdf I have tried it on a Radeon 9600 and a Radeon X850 Pro with the same failure. The frame rate drop below interactive levels (less than one frame per second!). If someone has used these functions sucessfully please let me know what your setup is. Thanks.

mrbastard

Sep 23, 2005 at 12:40 AM

I vaguely remember somebody posting a fast (or faster anyway) glsl noise implementation on opengl.org. The forum search should find it.

_the_phantom_

Sep 23, 2005 at 6:03 AM

yep, the AP has the current situation correct.

Do a google for 'simplexnoise' (also covered in the GLSL presentation from this years GDC, check the Forum FAQ for a link)

hitman200ca

Sep 23, 2005 at 7:42 AM

Thanks very much everyone.

I did search the forum with no luck but the google idea worked like a charm. I have an email into ATI regarding the issue so I will post their reply (if I get one).

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