3D X

Carsten Haitzler (The Rasterman) raster at rasterman.com
Sat Apr 1 17:33:38 PST 2006

On Sat, 01 Apr 2006 16:28:35 +1100 Russell Shaw <rjshaw at netspace.net.au>

> Hi,
> To get everything to tilt at an angle, you just add an X protocol to
> set a server transform to give whatever zoom or rotation to be applied
> to everything on the X screen. Also, XCreateWindow would take a "z"
> dimension for its distance "above" its parent. The total work to do that
> in the X server would be pretty straight forward.
> To get 3D alpha compositing, the server just maintains an in-memory
> (double-buffer) of the screen (the superposition of all individual windows),
> and an off-screen copy of each individual window.
> Erasing a window is just a matter of linear scaling and subtraction of the
> pixel values of the window from the screen (composite of all windows).
> What's all this stuff about "compositing managers" ?
> I don't get why 3D composited X windows are "hard" or complex to do.

summary... your fingers are still way too green mate. :) trust me - from those
that have been  around these traps for a while. the composite method is the
right way to go. its a great design in principle. it has rough edges - missing
bits, hooks, pipeline elements (being fixed - i bitch about them all the time),
but until you really understand how it all works - from the hardware to x's
internals to client-side programming at the low levels (that means xlib
levels)... you won't appreciate that.

just have some faith in the fact that it is being done right.

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------------- Codito, ergo sum - "I code, therefore I am" --------------
The Rasterman (Carsten Haitzler)    raster at rasterman.com
Tokyo, Japan (東京 日本)

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