Multi-Threaded Filtering

spacy51 · Post by **spacy51** » Sun Mar 23, 2008 3:03 pm

Hi there.

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It took my just about an hour to make use of my Dual Core CPU by splitting the image into two parts and let both cores filter one half of the image.

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Unfortunately, there are issues with HQ3x/4x ASM:

http://vba-m.com/forum/showthread.php?tid=32

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My code is generic, so it can split the iamge into 2 threads, 4 threads, 200, whatever.

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In theory, there are slightly visible borders between the areas splited up, but practically, I couldn't see them.

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I'll post it as soon as anyone took care of the HQ filters [img]<fileStore.core_Emoticons>/emoticons/tongue.png[/img]/emoticons/tongue@2x.png 2x" width="20" height="20" />

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Here's a small benchmark on my C2D E6300 @ 2.8 GHz:

PokÃ©mon Crystal, World Map:
hq2x, 1 thread: 640-705%

hq2x, 2 threads: 800-917%

hq2x, 4 threads: 800%

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Advacne Wars 2, Battle Field:

hq2x, 1 thread: 200%

hq2x, 2 threads: 250%

hq2x, 4 threads: 250%

I only have a dual-core CPU, so of course there's no speed improvement with 4 threads.

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I will attach the diff-file to enable multi-threaded filtering for Direct3D, just in case someone wants to try it out and check for the HQ3x/4x filters working.

mudlord · Post by **mudlord** » Sun Mar 23, 2008 6:22 pm

I'll see about making the OpenGL renderer use multithreaded code...

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Maybe Nach might be able to help us, since he is very knowledgeable in ASM [img]<fileStore.core_Emoticons>/emoticons/smile.png[/img]/emoticons/smile@2x.png 2x" width="20" height="20" />

spacy51 · Post by **spacy51** » Sun Mar 23, 2008 8:33 pm

Well, it would be better to migrate the pixel filtering code from the rendering APIs to a generic place like systemDrawScreen() in VBA.cpp,

but on the other hand, this would require some work to adjust everything.

mudlord · Post by **mudlord** » Tue Mar 25, 2008 12:13 am

Implemented.

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Thanks to chrono for fixing up the HQ3X/HQ4X assembler code.

spacy51 · Post by **spacy51** » Tue Mar 25, 2008 7:28 am

The problem is still there [img]<fileStore.core_Emoticons>/emoticons/sad.png[/img]/emoticons/sad@2x.png 2x" width="20" height="20" />

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Read http://vba-m.com/forum/showthread.php?tid=32&pid=200#pid200

mudlord · Post by **mudlord** » Tue Mar 25, 2008 7:34 am

Damn...[img]<fileStore.core_Emoticons>/emoticons/sad.png[/img]/emoticons/sad@2x.png 2x" width="20" height="20" />

spacy51 · Post by **spacy51** » Fri Mar 28, 2008 6:31 pm

Get the binary from http://vba-m.com/forum/showthread.php?tid=48