How I Optimized F-1 Spirit for Mobile Processors

[ekianjo]

An article I asked PtitSeb to write for a long time, so I hope you guys appreciate his effort (don't ask me how many times I had to remind him to finish the article). A very interesting outlook at how he did all his optimizations on F-1 spirit to make it run super fast on Pandora.



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[Hồng Thất Công]

Whoa!  Optimization is so complicated.  They say it's easier to start from scratch than fix someone else mess

 

[ekianjo]

Whoa!  Optimization is so complicated.  They say it's easier to start from scratch than fix someone else mess

Well F1 spirit was made for desktops in 2004, so it was probably appropriate at the time in terms of performance. But I really like what PtitSeb did to increase the overall performance for Pandora, and how dramatic that was!

 

[sebt3]

@ptitSeb:

great read, thanks.

On a side note, with these cosl/sinl on top I would have add cos/sin tables for speed boost (probably near useless but ...)

 

[M-HT]

On a side note, with these cosl/sinl on top I would have add cos/sin tables for speed boost  (probably near useless but ...)

Since the game is GPU limited it would probably be useless.

But in a similar case I first changed the input parameters to floats so the compiler generates cosf/sinf instead of cosl/sinl.

And since usually both cos and sin were computed (with the same parameter) I put the parameter in a temporary variable (float of course) and I put the calls close to each other so the compiler generates one call to sincosf instead of two calls to cosf and sinf.

And yes, the article was a good read.

 

[Reyhn]

Nice article, thanks.

I found it quite surprising that each tile loads its own texture. That's probably one of the most frequent beginners' mistakes. :huh:

 

[ingoreis]

Nice Arcticle Ekianjo

I tried porting this too but it was ever unplayable with my Knowledge ^_^

Thx for releasing that again Ptitseb

Do you renember my early Port on Slackware?

Was a Just for Fun Port and was realy not playable under Slackware :rolleyes:

https://www.youtube.com/embed/LtffIlqkMIg?feature=oembed

 

[ekianjo]

Nice video IngoReis ! 

Could you take a video of the current version ? That would be a good benchmark "before" and "after" PtitSeb's work ! 

I could add them to the article!

 

[ingoreis]

This Video here is from Ptitsebs Version

Had there only little Sound Problems.

https://www.youtube.com/embed/RZiPLEVooYI?feature=oembed

^_^ ^_^

 

[Farox]

Nice article !!   A must read for porters