On Wed, Jan 19, 2005 at 10:52:18AM +0100, Martijn Sipkema wrote:
> >> > Well, I'll consider having a look at it.
> >>
> >> You should, because this extension is / will be _the_ way to do
> >> render-to-texture with opengl. previous methods are slower (require
> >> context-switches) and they depend on windowing system (glx, wgl, agl).
> >>
> >> EXT_fbo is cross-platform, fast and does not require any windowing-system
> >> specific
> >> calls..
> >>
> >> The basic idea behind EXT_fbo is, that you can bind textures (any
> >> mipmap-level, or slice of 3d-texture) as framebuffer (color, stencil or
> >> depth -buffer) and then all the rendering operations operate on the texture
> >> rather than real framebuffer. Simple and clean.
> >
> > It's like they finally thought "hey, we should have arbitrary
> > off-screen surfaces that you can render to... and FROM." Finally,
> > after all this time, they reinvented the Pixmap. :)
>
> This was possible already using pbuffers/GLX.
>
Yes, it was possible, but it was slow (requires context-switches), and is
windowing system specific (wgl, glx, agl). Not good.
-- Pasi K�rkk�inen
^
. .
Linux
/ - \
Choice.of.the
.Next.Generation.
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