How to texture files which do not have height /width thats a power of 2

122

Author

October 03, 2002 01:23 PM

i want to create texture from a bmp file with resolution 800x600.I I do not want to strech or shrink the resolution ..ie i want to display it as it is. Is there a way to do it?If yes,PLz tell me . note:I am working on Linux for this project. Any help will be appreciated and will be thankful to u all my life

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Fruny

1,658

October 03, 2002 01:29 PM

Generate mipmaps for that texture with gluBuild2DMipmaps() :

quote:Red Book, p 385
"If your original has dimensions that are not exact powers of 2, gluBuild*DMipmaps() helpfully scales the image to the nearest power of 2. Also if your texture is too large, gluBuild*DMipmaps reduces the size of the image until it fits".

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

KalvinB

102

October 03, 2002 01:36 PM

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Fruny

1,658

October 03, 2002 01:48 PM

quote:Original post by KalvinB
Only DirectDraw can avoid that annoyance.

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

frmzero2hero

122

Author

October 03, 2002 01:59 PM

well i donot know what i Direct Draw .
And not have mip mapping convert it into the nearest power of 2.
Any other way out like loading the bmp file on the screen???
HELP!!!!!

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Fruny

1,658

October 03, 2002 02:09 PM

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

iNsAn1tY

476

October 03, 2002 02:09 PM

I believe that there''s actually an OpenGL extension you can enable which will allow you to use textures whose heights and/or widths are not powers of two. I''m not sure of it''s name, though. Anyone else know?

You might want to try searching for it here: http://oss.sgi.com/projects/ogl-sample/registry/. This is list of all the OpenGL extensions currently available, maintained by SGI. Have a look through (although there are about 300 of them...sorry

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frmzero2hero

122

Author

October 03, 2002 02:24 PM

Hey my requirements are very stringent in terms of shrinking/streching because this is being developed for a Physcology experiment and they want to track the exact position of the eye for a picture which is displayed full screen.
I am trying glDrawPixels..but if u have sum code that reads bmp and dumps its pixel info on the screen it will be great

thanks a lot for your Help

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Fruny

1,658

October 03, 2002 02:45 PM

*sigh* Mipmapping fits the requirements. Which you would realise if you would only read the *censored* manual, or even done a quick search on the concept.

Get your psychology department to buy you a copy if you can't afford it yourself.

As to sharing code, I don't see why I should bother when you're not even doing your share of the research work.

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[edited by - Fruny on October 3, 2002 3:47:04 PM]

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

iNsAn1tY

476

October 03, 2002 02:54 PM

Well, glDrawPixels would seem to be the only answer then, if you have to have the exact image you load on the screen.
Mipmapping will distort the image or shrink it (most systems can''t handle textures over 512x512). Either way, you''ll lose pixels...

Look up glReadPixels in the Red Book...

Movie Quote of the Week:

"You''ve been eating retard sandwiches again."
- Birdman, Beautiful Girls.Try http://uk.geocities.com/mentalmantle. Seriously. It''s brilliant.
And I just completely redesigned it so it looks even better.
DarkVertex Beta 0.8 available soon!

My opinion is a recombination and regurgitation of the opinions of those around me. I bring nothing new to the table, and as such, can be safely ignored.[ Useful things - Firefox | GLee | Boost | DevIL ]

How to texture files which do not have height /width thats a power of 2

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