[PD] gemhead render argument

altern altern2 at gmail.com
Sat Apr 5 11:14:02 CEST 2008

hi again

another issue i am getting with GEM on linux. When I run a patch that 
uses GEM that uses the webcam while the VGA output of the laptop is 
connected to an external monitor the X crashes ,  like if I press 

I guess it has more to do with the system configuration than with GEM 
but I am not sure...


IOhannes m zmoelnig(e)k dio:
> altern wrote:
>> hi
> [...]
>> While in windows all is rendered fine, linux does not like it the
>> rectangle was rendered but the webcam image wasnt. The only way to get
>> it to work was to put some render argument of the rectangle like 2. So I
>> decided to set that value to $0 on loadbang, this should give different
>> numbers to each instance of the abstractions. (Note that i dont have a
>> clue if this is bad idea). Both the camera image and the rectagle are
>> included in abstractions.
> i would say that this is generally a rather bad idea. you are 
> deliberately randomizing the render-order.
> why don't you just manually specify the rendering order the way it 
> should be?
> if the rectangle is to be drawn on top of the textured geo, you would 
> want to render it later, thus it should have a higher number than the 
> white rectangle.
>> The result was kind of ok, now linux was more happy with it but still
>> sometimes the webcam image goes off again. This happens for example when
>> I move the gem window or after ~10 to ~20 secs. Also if i open a PD
>> subpatch.
> for me this seems to be a problem with the driver (texture memory).
> which gfx-care do you use? which driver?
>> I guess this must be some problem with having two gemheads but i am not
> i don't think so.
>> sure why this problem is not happening at all under windows, so it looks
>> like a linux issue. Anything i can do to avoid this problem?
> is this the same computer (same hardware) running both w32 and linux?
> which (exact) versions of Gem are you using?
> what do you mean by "the image goes off"? does the geo you render it 
> onto goes black? white? green? invisible?
> does the camera work stable on linux? with Gem? (for long-term?) is 
> anything printed to either the pd-console or the terminal-console? 
> (watch both - a lot of messages in the capture code are not written to 
> the pd-console!)
> fmgasdr.
> IOhannes

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