[SDL] Problem with rendertargets (no output/video)

Anthony DeChiaro ktulu1115 at yahoo.com
Wed Jan 26 09:36:50 PST 2005


Actually, no OpenGL apps work fine - Xscreensaver works without any
problems, I can play games that use OpenGL without any difficulties -
it only seems to be the render targets functionality that isn't
working.

--- Stephane Marchesin <stephane.marchesin at wanadoo.fr> wrote:

> Anthony DeChiaro wrote:
> 
> >I'm trying to run a XMMS visualization/plugin for Linux called
> >projectM which uses SDL to run.  Requires render targets, so a CVS
> >version of SDL 1.3 from 2004-04-04) is provided with the it. 
> >Application used to work fine, however with a reinstall of Ubuntu
> >Linux (Debian-based), I cannot get it working (get a blank output
> in
> >the window).  I've tried latest CVS and a few other versions, all
> >give same results.
> >
> >I compiled the files in the "test" directory of the SDL tarfile
> and
> >ran each to ensure they work.  All of them operated correctly
> >*except* testrendertarget and testgl - they give the same results
> as
> >projectM (no video).  Below are the results:
> >
> >./testrendertarget gives a blank screen (same problem with
> projectM),
> >with the following output: 
> > 
> >Created render target: 
> >SDL_GL_RED_SIZE: 8 
> >SDL_GL_GREEN_SIZE: 8 
> >SDL_GL_BLUE_SIZE: 8 
> >SDL_GL_ALPHA_SIZE: 0 
> >SDL_GL_DEPTH_SIZE: 24 
> >697 frames in 5.004 seconds = 139.289 FPS 
> > 
> >./testgl gives the following (again, with blank output): 
> > 
> >Screen BPP: 32 
> > 
> >Vendor : (null) 
> >Renderer : (null) 
> >Version : (null) 
> >Extensions : (null) 
> > 
> >SDL_GL_RED_SIZE: requested 5, got 8 
> >SDL_GL_GREEN_SIZE: requested 5, got 8 
> >SDL_GL_BLUE_SIZE: requested 5, got 8 
> >SDL_GL_DEPTH_SIZE: requested 16, got 24 
> >SDL_GL_DOUBLEBUFFER: requested 1, got 1 
> >app lost mouse focus 
> >app gained mouse focus 
> >app lost mouse focus 
> >3988.59 FPS 
> > 
> >Now the interesting thing is my /etc/X11/XF86Config-4 file has
> >default depth as 24, not 32.  In fact 32 is not even listed
> anywhere
> >within the file - not entirely sure why testgl reports Screen BPP
> at
> >32.  I've tried messing with the source for testgl and
> >testrendertarget, trying both 24 and 32 bits instead of 16, still
> no
> >luck.
> >
> >Running kernel 2.6.8.1-3-386 on Athlon64 3200+, GeForce FX 5900XT,
> >NVIDIA driver version 1.0-6111.  Is this a known issue and/or can
> >anyone provide any help?  Thanks.
> >
> So basically you're saying that SDL/OpenGL programs don't work for
> you, 
> right ?
> 
> Are your sure your OpenGL configuration is correct ? Can you run
> other 
> opengl apps and games to confirm this ?
> 
> Stephane
> 
> 
> 
> 
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> 





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