GLSL noise fail? Not necessarily!

Benchmark result for ATI Radeon HD 4850:

Quote:

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GL vendor: ATI Technologies Inc.
GL renderer: ATI Radeon HD 4800 Series
GL version: 3.3.10428 Compatibility Profile Context

2D simplex noise, version 2011-03-21, 2455.1 Msamples/s
3D simplex noise, version 2011-03-21, 1413.6 Msamples/s
4D simplex noise, version 2011-03-21, 870.9 Msamples/s

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My over three year old laptop with integrated Intel graphics:

Code :

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GL vendor:   Tungsten Graphics, Inc
GL renderer: Mesa DRI Intel(R) 965GM GEM 20100330 DEVELOPMENT 
GL version:  2.1 Mesa 7.10
 
2D simplex noise, version 2011-03-21, 23.1 Msamples/s
3D simplex noise, version 2011-03-21, 15.4 Msamples/s
4D simplex noise, version 2011-03-21, 9.0 Msamples/s

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And here's the results for software rendering on an Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50GHz:

Code :

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GL vendor:   Mesa Project
GL renderer: Software Rasterizer
GL version:  2.1 Mesa 7.10
 
2D simplex noise, version 2011-03-21, 0.3 Msamples/s
3D simplex noise, version 2011-03-21, 0.2 Msamples/s
4D simplex noise, version 2011-03-21, 0.2 Msamples/s

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We've added Stefan's benchmark's (and Stefan) to the repository and included a number of suggestions and fixes from earlier in the thread.
http://github.com/ashima/webgl-noise

The code in the Github repository provided by Ian has now been updated rather a lot, and I no longer recommend using my pre-packaged zip archives posted above. They still work, but I will not be updating them on a regular basis. Please use the Github repo to get the latest versions of the shaders and the benchmarking application.

And for those of you wondering, yes, there is a write-up coming. We're working on it right now. In the meantime, feel free to ask any questions here.

Nice work!

The invSqrt taylor approximation uses the value 0.83666002653408, which is the square root of 0.7, shouldn't this be the inverse root of 0.7, i.e. 1.195228609 ?

Yes, of course. Good catch, thanks! It has only a minor effect
on the final result, but it does make a difference. This change
will be committed to the repository as soon as I have
determined the corresponding scaling of the final values.

EDIT: Github repository updated.

We've changed the licence to the MIT License.
:)

Results on a MacBook, not very impressive, but this week I will post the results on a GTX580 :)

GL vendor: NVIDIA Corporation
GL renderer: NVIDIA GeForce 9400M OpenGL Engine
GL version: 2.1 NVIDIA-1.6.26
Desktop size: 1280 x 800 pixels

2D simplex noise, version 2011-03-25, 134.4 Msamples/s
3D simplex noise, version 2011-03-25, 61.7 Msamples/s
4D simplex noise, version 2011-03-25, 25.9 Msamples/s