Re: Choosing Between Target Texture

On Aug 28, 1:28=A0pm, Wolfgang Draxinger <wdraxin...@[EMAIL PROTECTED]
>
wrote:
> Knockr wrote:
> > Dear All,
>
> > I'm using rendering few textures in my OpenGL which is NPOT(non
> > power of two).
>
> > I've tried using both GL_TEXTURE_RECTANGLE_ARB and
> > GL_TEXTURE_RECTANGLE_NV as target texture. Bother are working
> > fine in my nVidia Hardware. Is there any advantage for either
> > of these over other? ARB is the standard format and NV is the
> > nVidia format. Will I get any performance improvements for NV
> > texture rectangle if I use it with nVidia Hardware?
>
> It was NVidia who came up with NPO2 textures first, so that's why
> there is the _NV extension. Then NPO2 textures got accepted as a
> standard feature and they became _ARB.
>
> Now if you looked into the specification of both extensions, then
> you would have seen that the newly introduced tokens have the
> same values:
>
> ~ $ grep TEXTURE_RECTANGLE /usr/include/GL/glext
> #define GL_TEXTURE_RECTANGLE_ARB =A0 =A0 =A0 =A0 =A00x84F5
> #define GL_PROXY_TEXTURE_RECTANGLE_ARB =A0 =A00x84F7
> #define GL_TEXTURE_RECTANGLE_NV =A0 =A0 =A0 =A0 =A0 0x84F5
> #define GL_PROXY_TEXTURE_RECTANGLE_NV =A0 =A0 0x84F7
>
> So there's absolutely no difference. But for reasons of
> ****tability you should use the ARB variant in your code. The _NV
> version might go away.
>
> Wolfgang Draxinger
> --
> E-Mail address works, Jabber: hexar...@[EMAIL PROTECTED]
 ICQ: 134682867

Thanks alot for your prompt reply. It was really helpful.

I'm also using Cg fragment programs with my application. Is it
possible to execute it without "GL_NV_fragment_program "? will it work
fine with "GL_ARB_fragment_program "?

In my understanding "GL_NV_fragment_program " is required.