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What does D3DCREATE_SOFTWARE_VERTEXPROCESSING mean?

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#1 jerrycao_1985   Members   

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Posted 28 January 2014 - 03:07 AM

Hi all

 

what does the flag "D3DCREATE_SOFTWARE_VERTEXPROCESSING" mean?

What it tells in the official document is quite limited, just the following line.

     Specifies software vertex processing.

 

So what does it mean by software vertex processing?

Does it mean that all of the vertex shader will be processed by CPU? I've totally no idea of it, however i guess it shouldn't be the case.

Or it will be very slow.

 

Please give me some pointers on it.

 

Thanks

Jerry



#2 kauna   Members   

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Posted 28 January 2014 - 05:40 AM

It means exactly what it says : all the vertex processing will be done on CPU by the software. Typically the CPU isn't as fast as a GPU when processing geometry, on the other hand, it could still work well enough under certain cases.

 

Cheers!



#3 Hodgman   Moderators   

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Posted 28 January 2014 - 05:44 AM

Does it mean that all of the vertex shader will be processed by CPU?

Yes.

it will be very slow.

Yes!
 
It's mostly there as an option for compatibility with very old GPUs that don't support vertex shaders.



#4 Tom KQT   Members   

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Posted 28 January 2014 - 07:21 AM


It's mostly there as an option for compatibility with very old GPUs that don't support vertex shaders.

 

 

I also had to use it on some integrated Intel graphical chip which wasn't so old. I don't remember the type.



#5 jerrycao_1985   Members   

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Posted 29 January 2014 - 01:06 AM

Thanks for all of the answers, they are very helpful.






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