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Render-to-texture

Started by OrangyTang Oct 5, 2002 at 7:16 AM 4 replies 450+ views

Original Post

333

Oct 5, 2002 at 7:16 AM

I can''t seem to find any concrete sources on which method is faster for doing render to texture stuff.. Nvidias p-buffer seems good, but plenty of sources say that its no faster than doing a copyTexSubImage() because thats what the drivers are currently doing

plus i''d like to avoid anything nvidia specific for now. Perhaps having a separate rendering surface and copying this to a texture manually? Or even using the back-buffer as temp scratch drawing, copy into texture and clear before drawing the scene properly? Any pointers appreciated.

Ingenu

132

Ingenu

Oct 5, 2002 at 7:48 AM

There''s a WGL extension if you use windows.

It''s fast on ATI boards, slower on nVidia boards.

-* So many things to do, so little time to spend. *-

OrangyTang

Author

333

OrangyTang

Oct 5, 2002 at 8:08 AM

Faster on both than a copyTexSubImage?

Aha, i think i found the extension you''re refering to.. WGL_ARB_render_texture (should of seen that earlier, oops). Don''t suppose anyone knows of any good tutorials on setting up this ext? All the ones i can find are for p-buffer setup

zedzeek

164

zedzeek

Oct 5, 2002 at 3:51 PM

>>Faster on both than a copyTexSubImage?<<

rendertexture was slower than copytexsubimage on nvidia cards a while ago (i havent tested for a few months though)
this has been discussed quite a bit in the www.opengl.org forums perhaps do a search there

ps i was talking about with nvidia cards

http://uk.geocities.com/sloppyturds/kea/kea.html
http://uk.geocities.com/sloppyturds/gotterdammerung.html

DannerGL

Oct 6, 2002 at 11:29 PM

quote:
Original post by OrangyTang
Faster on both than a copyTexSubImage?

Aha, i think i found the extension you''re refering to.. WGL_ARB_render_texture (should of seen that earlier, oops). Don''t suppose anyone knows of any good tutorials on setting up this ext? All the ones i can find are for p-buffer setup

I''ve got some code based on the NeHe tutorials for using WGL_ARB_render_texture. It''s pretty simple and easy to understand. E-mail me if you''d like it: domachi@ati.com

DannerGL

Oct 6, 2002 at 11:29 PM

quote:
Original post by OrangyTang
Faster on both than a copyTexSubImage?

Aha, i think i found the extension you''re refering to.. WGL_ARB_render_texture (should of seen that earlier, oops). Don''t suppose anyone knows of any good tutorials on setting up this ext? All the ones i can find are for p-buffer setup

I''ve got some code based on the NeHe tutorials for using WGL_ARB_render_texture. It''s pretty simple and easy to understand. E-mail me if you''d like it.

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