Saving screenshot to disk?

Win Elchtest · 2003-03-03T01:02:06

Hello, i''m looking for a function to save the actual rendered screen to an image file. even better would be something where i could set some parameters, like i only want the part saved from screen coordiantes e.g. (200,300) to (328, 428) or something like this. thanx a lot!

Graphics and GPU Programming Programming

Started by Win Elchtest February 08, 2003 01:16 PM

17 comments, last by Win Elchtest 21 years, 1 month ago

yummy_potatoes

122

March 01, 2003 11:02 AM

temp = Data[index];Data[index] = Data[index+2];Data[index+2] = temp;

I love it how people use temporary values to do swaps...
Try this instead sometime:

Data[index] ^= Data[index+2];Data[index+2] ^= Data[index];Data[index] ^= Data[index+2];

Voila! No temp variable. (I think I did that right)

"C makes it easy to shoot yourself in the foot; C++ makes it harder, but
when you do, it blows away your whole leg."

- Bjarne Stroustrup

Realm Games Company

"I once thought I was wrong, but then I was mistaken." - A4

zealouselixir

256

March 01, 2003 12:30 PM

Hm. 3 assigns and an overhead-less 4-byte temp versus three XOR-assigns. You have any time-trials to show that your method is dazzlingly faster than mine?

edit : oh, and pardon me for overlooking the additional ADD and 2 pointer lookups that your method includes. Guess you really are just too clever for me. I bow down before you...

edit2 : by the way, your website link appears to be broken.

[edited by - zealouselixir on March 1, 2003 1:35:34 PM]

[twitter]warrenm[/twitter]

yummy_potatoes

122

March 01, 2003 01:11 PM

I''m not sure if it is faster, but if you are pressed for memory, it does beat your method there.

hmm I musta made a typo in my link...(fixing)

"I once thought I was wrong, but then I was mistaken." - A4

zealouselixir

256

March 01, 2003 01:19 PM

Pressed for memory? That''s about the shittiest excuse I''ve ever heard for someone not admitting they were wrong...

[twitter]warrenm[/twitter]

Thunder_Hawk

314

March 01, 2003 01:20 PM

If you can''t afford and extra byte of memory(or 4, not sure how it ends up), then you''ve got bigger things to worry about!

______________________________________________________________________________________The Phoenix shall arise from the ashes... ThunderHawk -- ¦þ"So. Any n00bs need some pointers? I have a std::vector<n00b*> right here..." - ZahlmanMySite | Forum FAQ | File Formats______________________________________________________________________________________

zealouselixir

256

March 01, 2003 01:23 PM

Yeah, that was actually a mistake on my part. Turns out it's just one byte (though it may well wind up as 32 bits on the stack to help out the processor).

[edited by - zealouselixir on March 1, 2003 2:25:42 PM]

[twitter]warrenm[/twitter]

yummy_potatoes

122

March 01, 2003 02:37 PM

Yes, I may be wrong, but I did show you a neat method... :D

(do it out on pen and paper to see the bits work their swapping magic)

and I correct the link my sig

"C makes it easy to shoot yourself in the foot; C++ makes it harder, but
when you do, it blows away your whole leg."

- Bjarne Stroustrup

Realm Games Company

"I once thought I was wrong, but then I was mistaken." - A4

Win Elchtest

122

Author

March 01, 2003 06:08 PM

interesting concept, but i think it doesn't work. it's just too late now here to think about it calm (besided i had a birthday party some hours before...)

i write on this again

[you all wanted this posting, didn't you?]

[edited by - Win Elchtest on March 1, 2003 7:12:48 PM]

http://www.quake.de

Seriema

634

March 03, 2003 01:02 AM

Ready4Dis: Well... glReadPixels are ALOT slower than rendering directly to the texture

If you look through the slides on the link you''ll see that''s the second slowest method (they suggest 5-6 methods I think).

Then saving to a file, well you can''t get away from that now can you?

"No lies of sugar can sweeten the sournes of reality"

}+TITANIUM+{ A.K.A. DXnewbie[onMIRC]

[ ThumbView: Adds thumbnail support for DDS, PCX, TGA and 16 other imagetypes for Windows XP Explorer. ] [ Chocolate peanuts: Brazilian recipe for home made chocolate covered peanuts. Pure coding pleasure. ]

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