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Re: AU with OpenGL GUI

There is an extension (ARB_texture_non_power_of_two) which lifts the restriction, and OpenGL 2.0 requires the presence of this extension. It is not, however, supported on all cards. AFAIK, the GeForce 6 family are the only hardware currently able to support this extension.

Caution--if you use the non-power-of-two extension, you lose some functionality (like texture wrapping, I believe). Also UV coordinates are specified differently (pixel-based instead of zero-to-one based).

Nope, you're thinking of NV_texture_rectangle, EXT_texture_rectangle, and ARB_texture_rectangle (all of which are essentially the same extension).

Those extensions are supported on all cards from the GeForce MXs and Radeons up, and even a special case (screen-aligned quads) is (unofficially) supported on the Rage 128.

ARB_texture_non_power_of_two has no restrictions. 0..1 texture coordinates, wrapping, mipmapping, &c all work exactly as for power-of-two textures. That's why the extension requires such new hardware :)

-Keith

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References: 
 >Re: AU with OpenGL GUI (From: Shaun Wexler <email@hidden>)
 >Re: AU with OpenGL GUI (From: Keith Bauer <email@hidden>)
 >Re: AU with OpenGL GUI (From: John Stiles <email@hidden>)



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