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Old 07-12-10, 03:48 PM   #1
Linuxhippy
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Default Trapezoid-Acceleration on which cards?

Hi,

For me its time to buy a new graphic card and 2D performance is all that counts for me.

I read the nvidia driver is able to rasterize trapezoids using the GPU, which is a very interesting feature for me. Which GPUs actually support that?
Is it really only supported on G200, or does the newer/cheaper GT218 also accelerate it?

Are there any benchmarks available indicating how well it works?

Thank you in advance, Clemens
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Old 07-13-10, 06:32 AM   #2
AaronP
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Default Re: Trapezoid-Acceleration on which cards?

GT200 and higher support it, which includes GT218 and the MCP79 chipset that's used in Ion. It's also supported on the new Fermi architecture (GF100 and the newly-released GF104).
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Old 07-13-10, 06:33 AM   #3
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Default Re: Trapezoid-Acceleration on which cards?

Oh yeah, and I don't know of any published benchmarks anywhere, but when I was testing it, it reduced some cairo-perf-trace results from thousands of seconds to tens of seconds.
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Old 07-13-10, 06:33 PM   #4
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Default Re: Trapezoid-Acceleration on which cards?

For the record, the 256 driver release series supports trapezoid acceleration by default, without having to enable the AccelerateTrapezoids NV-Control attribute.
Since I don't know if it's been mentioned anywhere before, it also supports accelerating all types of RENDER gradients.
Gradient acceleration works on all Geforce 8 series products and newer while trapezoid acceleration is only supported by anything higher than GT200 as Aaron pointed out.

If you have any numbers of how that impacts your Java2D back-end or other things, I'd be interested to see a before/after comparison or against other drivers.
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Old 07-17-10, 05:30 AM   #5
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Default Re: Trapezoid-Acceleration on which cards?

Quote:
GT200 and higher support it, which includes GT218 and the MCP79 chipset that's used in Ion
Glad to hear that and thanks for letting me know about Gradient acceleration - I really didn't know about that. Thanks for providing such complete Render acceleration!

Quote:
If you have any numbers of how that impacts your Java2D back-end or other things, I'd be interested to see a before/after comparison or against other drivers.
I'll report back as soon as I have numbers.

However I won't compare directly against other drivers. I think AMDs binary driver is _crap_, but they are officially supporting open-source driver development which I after all prefer, so I don't want to do marketing in favour of nvidia.

Thanks a lot, Clemens
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Old 07-17-10, 07:15 AM   #6
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Default Re: Trapezoid-Acceleration on which cards?

Quote:
Originally Posted by Linuxhippy View Post
However I won't compare directly against other drivers. I think AMDs binary driver is _crap_, but they are officially supporting open-source driver development which I after all prefer, so I don't want to do marketing in favour of nvidia.
Thanks a lot, Clemens
If you can you should compare directly against other drivers. People say AMD binary is _crap_ because this is true. But until there is no independent, repeatable proof like any benchmark results no one in AMD will take such jabbering seriously. Benchmark results comparing Nvidia binary vs AMD opensource and binary will show how it looks like for real and may be motivating for AMD to do something with slow 2D. If AMD will speed up Nvidia will be motivated to speed up more to keep 2D speed crown. Finally the customer wins because Linux has better 2D speed thanks to improved drivers on both sides.
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Old 07-17-10, 08:27 AM   #7
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Default Re: Trapezoid-Acceleration on which cards?

I'd also like to see comparisons to other drivers - open source or not.
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Old 07-17-10, 08:48 AM   #8
Linuxhippy
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Default Re: Trapezoid-Acceleration on which cards?

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Originally Posted by zbiggy View Post
But until there is no independent, repeatable proof like any benchmark results no one in AMD will take such jabbering seriously.
So you really believe AMD doesn't know their drivers are crap

After all phoronix does already a lot of benchmarking, and they produce a lot bold headlines and judgements - I don't have the energy to do the same.

- Clemens
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Old 07-17-10, 09:05 AM   #9
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Default Re: Trapezoid-Acceleration on which cards?

Saying that Phoronix does benchmarks is a pretty bold claim already.
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