RE: GdkOffscreenWindow and texture_from_pixmap extension

[Shawn Bakhtiar <shashaness hotmail com>]

Juan,

Let me know if you find a good way to do this with GtkGLExt, it is something I need to do on the OS X 
platform. I think this will help you, here is where I first came across on the apple devnet:

http://developer.apple.com/mac/library/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_offscreen/opengl_offscreen.html#//apple_ref/doc/uid/TP40001987-CH403-SW2

and here is the actual opengl reference to it:

http://www.opengl.org/registry/specs/EXT/framebuffer_object.txt


You can use OpenGL Extensions to create buffers (original was only for texture maps apparently), render to 
them, and place them in scene as texture, or pictures, or even video, the best thing is there is a whole set 
of utils to take the buffer, and render directly to objects, and can be done so in a single context, of your 
choosing. This is how OS X does its fancy iChat AV

In general rendering to offscreen will be much slower then rendering directly to a video framebuffer. 



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> Date: Thu, 1 Apr 2010 20:25:11 -0700
> Subject: GdkOffscreenWindow and texture_from_pixmap extension
> From: juanpablougarte gmail com
> To: gtk-app-devel-list gnome org
>
> Hello everyone.
>
> I want to do some OpenGL widget compositing using GtkGLExt and
> GdkOffscreenWindow.
>
> I implemented a offscreen widget as the ones in gtk-demo to be able to
> use the offscreen GdkPixmap as the source for a texture.
>
>
> But I am having some problems while trying to bind the GdkPixmap to the texture
>
> So does anyone know how to ge a Pixmap, as returned by
> XcompositeNameWindowPixmap(), from a GdkOffscreenWindow in order to
> use it in glxCreatePixmap()?
>
>
> thanks
>
>
> Juan Pablo
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