[tuhopuu-devel] Gameengine + stereo

[Kester Maddock]

Hi Chris,

This is a known problem.  The hwpageflip mode needs a stereo visual, which 
needs to be set on window creation, so it doesn't work within the main 
blender program, only blenderplayer.  :-(  There is also another hack you 
need to perform: in BL_KetsjiEmbedStart.cpp, stereo for the embedded game 
engine is only enabled if the stereo mode is not hwpageflip.

The other modes don't need a stereo visual at all.

To fix this, there needs to be some magic in ghost: either a way to recreate 
the window, or create a separate stereo window for the game engine.  It would 
be nicer to recreate the window, but that possibly means flushing all the 
textures & display lists (unless they share properly.)  Recreating the window 
also lets me request a stencil buffer, accumulation buffer, destination alpha 
etc. B-)

Kester

On Saturday 14 August 2004 10:17, Chris Want wrote:
> > They will work on Quadro cards.  Make sure Option "Stereo" "1" is in
> > XFree86Config (and see nvidia's readme for details)  I'm not sure if
> > there are software geforce to quadro hacks for Linux.  Performance should
> > be roughly half that of non stereo, for all modes.
> >
> > Also, try turning on Vertex Arrays in System & OpenGL - it uses vertex
> > buffer objects, and try turning off shadows in the scene buttons.
> >
> > I don't actually have access to any shutter glasses, but I have had a
> > report that it works!
>
> Just a little report of my progress with stereo under Linux.
> I managed to borrow a Quadro FX2000 at work for a little while
> and gave it a try. This card has the glasses that connect through a
> DIN connector, and so the the option for XFree86 is Option "Stereo" "3".
> The glasses are wireless and use an emitter to sync up with
> the card (this is handy for debugging since a little red light
> goes on in the emitter whenever a stereo capable window is created).
>
> Stereo didn't work, until I did a royal hack in the file
> intern/ghost/intern/GHOST_WindowX11.cpp:
>
> Changed :
>
> if(m_stereoVisual)
>     attributes[i++] = GLX_STEREO;
>
> to just:
>     attributes[i++] = GLX_STEREO;
>
> to force the stereo mode on always. After the hack was performed,
> the little red light on the emitter would come on after
> blender/blenderplayer was launched. It seems important with
> this class of shutter glasses to get the stereo settings right at
> window creation time.
>
> 'blender' still did not do stereo when p was pressed, but
> 'blenderplayer -s hwpageflip' worked great (except that the
> eye separation issue would have meant a migrane headache after
> some use). Before the royal hack, the anaglyph mode was quite
> perky (this is a really fast card), but after the hack the
> xserver would hang after a few seconds of anaglyph mode
> (this is in the 'blender' program ... these was no hang in
> the 'blenderplayer' program before or after the hack).
>
> Chris
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