[PD-dev] Gem CVS Bug (wrong alarm ??)

[guenter geiger]

If possible I am for a single texture object, from a users point of
view.
I have been discussing a lot with Johannes the topic of going
to lower levels ( as DIPS does for example).

We have to take care to balance the usability/flexibility tradeoff.
It is true that one single texture reduces flexibility to a certain
amount.

I think to regain this we could have another, low level access to
OpenGL functionality, for "power users".

Specifically, in order to get Gem out of the "hacker domain"
we have to think a lot about usability and general concept.

Regarding Erichs problem, I think we should add and alias
texture2->texture. I did this on the "old" CVS (soon to disappear).


Greetings,

Guenter



On Thu, 14 Nov 2002, chris clepper wrote:

> >I think that it's a good idea to keep separate pix_texture and pix_texture2
> >objects because power of 2 textures work differently from non-pow2 textures,
> >no matter what tricks/extensions you use to allow the use of non-pow2
> >textures.   These differences are in the support for wrap modes, borders
> >etc.
> >
> >Presently, a non-pow2 texture using texture coord scaling (as implemented by
> >pix_texture2) will repeat but will include the black padding zones.  Using
> >GL_TEXTURE_RECTANGLE_NV repeat is not supported at all.
>
> no if you give the coords in 0..height 0..width it will cover the
> surface completely.
>
> >These behavioural differences can't be properly hidden, can they?  And
> >sooner or later it would be nice to expose the wrap mode and border settings
> >for control via messages to the pix_textureX object...
>
> yes.  the option for the user to do wrap or clamp_to_edge would be nice.
>
> >Details for nVidia's non-pow2 extension.
> >http://www.nvidia.com/dev_content/nvopenglspecs/GL_NV_texture_rectangle.txt
>
> thanks for the info.  this looks pretty close to the apple extension.
>
> >
> >>  ...well, at least for the MacOSX build, we need both
> >texture/texture2...this is because
> >>  we use an extension for non-power of 2 textures that makes for incredibly
> >fast
> >>  performance...unfortunately, I don't know if the extension
> >(GL_TEXTURE_RECTANGLE_EXT) is
> >  > available on other platforms?
> >
> >Notwithstanding what I said above, the fast texture support on Mac OS X
> >doesn't need to be used with non-pow2 textures, does it?
>
> no, but it sure cuts down on wasted bandwidth.  640*480 is a hell of
> a lot fewer pixels than 1024*1024.  also IMHO the power of two
> texture thing is just plain silly.  how many images do you run across
> that conform to this?
>
> >The texture rectangle extension is available in the nvidia drivers... not
> >sure about other vendors or MESA.
>
> it would be good to check the support for this under linux and windows.
>
> cgc
>
> >
> >Daniel
> >
> >
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