From: <fab...@go...> - 2007-09-20 20:21:44
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Someone interested? Fabien ---------- Forwarded message ---------- From: Thomas Jacobson <th...@tc...> Date: Sep 20, 2007 4:09 AM Subject: Stellarium for the OLPC XO... To: ste...@fr... Hi. Last week I gave a talk on networking and satellites to the MIT One Laptop Per Child group. (see www.laptop.org, www.olpcnews.com for gossip, and www.olpc.tv for some videos) The night before I had been laying under the clear dark sky at my cabin in Wisconsin, and it occurred to me that somebody ought to port Stellarium to the OLPC XO laptop. No doubt somebody like www.timothyferris.com would tell you how important it would be to children in the developing world. I suggested this to several OLPC folks, and everyone agreed... it was an excellent idea, but they are totally swamped just getting the XO out the door with the basic functionally. The display on the OLPC is outstanding... and there may be some nifty tricks you could do to leverage its very high contrast high resolution screen... I would bet that if someone in the Stellarium developer community were to offer to undertake a port, that the OLPC folks would supply an XO or two to do it on... I think the OLPC website has information on how to propose such a project. Good luck! Thomas Jacobson |
From: Johannes G. <joh...@gm...> - 2007-09-20 21:10:05
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On 2007.09.20 22:21:38 CEST, Fabien Ch=E9reau wrote: > Someone interested? > Fabien Quotation from the specs: # CPU clock speed: 433 Mhz; # Graphics controller: Integrated with Geode CPU; unified memory =20 architecture; # DRAM memory: 256 MiB dynamic RAM; An old notebook of my mother had 256MB ram, Pentium3 1GHz and SiS accelerated 3D graphic. I managed to run stellarium, although without constellation art (too big for loading). The performance was 15FPS with properly installed DRI driver and less than 1FPS with MesaSoft. Since I cannot believe the Geode CPU has accelerated 3D graphic, I say it is hopeless. Just forget it. Would be nice, but just forget it. An approach without OpenGL would be needed. KStars might work. Xephem certainly will. Johannes > ---------- Forwarded message ---------- > From: Thomas Jacobson <th...@tc...> > Date: Sep 20, 2007 4:09 AM > Subject: Stellarium for the OLPC XO... > To: ste...@fr... >=20 > Hi. >=20 > Last week I gave a talk on networking and satellites to the MIT One =20 > Laptop > Per Child group. (see www.laptop.org, www.olpcnews.com for gossip, and > www.olpc.tv for some videos) The night before I had been laying under =20 > the > clear dark sky at my cabin in Wisconsin, and it occurred to me that =20 > somebody > ought to port Stellarium to the OLPC XO laptop. No doubt somebody like > www.timothyferris.com would tell you how important it would be to =20 > children > in the developing world. I suggested this to several OLPC folks, and > everyone agreed... it was an excellent idea, but they are totally =20 > swamped > just getting the XO out the door with the basic functionally. >=20 > The display on the OLPC is outstanding... and there may be some nifty =20 > tricks > you could do to leverage its very high contrast high resolution =20 > screen... I > would bet that if someone in the Stellarium developer community were =20 > to > offer to undertake a port, that the OLPC folks would supply an XO or =20 > two to > do it on... >=20 > I think the OLPC website has information on how to propose such a =20 > project. >=20 > Good luck! >=20 > Thomas Jacobson >=20 > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Stellarium-pubdevel mailing list > Ste...@li... > https://lists.sourceforge.net/lists/listinfo/stellarium-pubdevel >=20 |
From: <fab...@go...> - 2007-09-20 22:24:05
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I know it would be difficult, but I think it is not totally impossible, althought it would require important changes such as: - using Cairo as a renderer: unlike many openGL applications, we use almos= t exclusively 2d openGL rendering since we compute the projection of most of the vertex on the CPU, so moving to a 2D renderer like Cairo is not totally impossible for us. - removing things that are continuously animated (or optimize the renderin= g so that only them are refreshed) so that the framerate of 0 FPS would be acceptable when user don't interact - Use a degraded rendering when the user interacts to keep the movements fluid (like display less stars). - use lower resolution textures and optimize texture loading (lazy loading using ram/disk/network multi-stage cach) - use a smaller star catalog - have a lower quality atmosphere rendering (less points computed) - use a less accurate and simplified planet position algorithms I am sure that alltogether, the framerate could reach something fast enough to be useable, even on OLPC. Some of the features could even be very useful for the normal version: a Cairo renderer would allow to export images in PD= F very easily, and the multi stage texture caching would improve loading spee= d and reduce memory consumption. Fabien On 9/20/07, Johannes Gajdosik <joh...@gm...> wrote: > > On 2007.09.20 22:21:38 CEST, Fabien Ch=E9reau wrote: > > Someone interested? > > Fabien > > Quotation from the specs: > # CPU clock speed: 433 Mhz; > # Graphics controller: Integrated with Geode CPU; unified memory > architecture; > # DRAM memory: 256 MiB dynamic RAM; > An old notebook of my mother had 256MB ram, Pentium3 1GHz > and SiS accelerated 3D graphic. I managed to run stellarium, > although without constellation art (too big for loading). > The performance was 15FPS with properly installed DRI > driver and less than 1FPS with MesaSoft. > Since I cannot believe the Geode CPU has accelerated > 3D graphic, I say it is hopeless. Just forget it. > Would be nice, but just forget it. > > An approach without OpenGL would be needed. > KStars might work. Xephem certainly will. > > Johannes > > > > ---------- Forwarded message ---------- > > From: Thomas Jacobson <th...@tc...> > > Date: Sep 20, 2007 4:09 AM > > Subject: Stellarium for the OLPC XO... > > To: ste...@fr... > > > > Hi. > > > > Last week I gave a talk on networking and satellites to the MIT One > > Laptop > > Per Child group. (see www.laptop.org, www.olpcnews.com for gossip, and > > www.olpc.tv for some videos) The night before I had been laying under > > the > > clear dark sky at my cabin in Wisconsin, and it occurred to me that > > somebody > > ought to port Stellarium to the OLPC XO laptop. No doubt somebody like > > www.timothyferris.com would tell you how important it would be to > > children > > in the developing world. I suggested this to several OLPC folks, and > > everyone agreed... it was an excellent idea, but they are totally > > swamped > > just getting the XO out the door with the basic functionally. > > > > The display on the OLPC is outstanding... and there may be some nifty > > tricks > > you could do to leverage its very high contrast high resolution > > screen... I > > would bet that if someone in the Stellarium developer community were > > to > > offer to undertake a port, that the OLPC folks would supply an XO or > > two to > > do it on... > > > > I think the OLPC website has information on how to propose such a > > project. > > > > Good luck! > > > > Thomas Jacobson > > > > > > ------------------------------------------------------------------------- > > This SF.net email is sponsored by: Microsoft > > Defy all challenges. Microsoft(R) Visual Studio 2005. > > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > > > _______________________________________________ > > Stellarium-pubdevel mailing list > > Ste...@li... > > https://lists.sourceforge.net/lists/listinfo/stellarium-pubdevel > > > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Stellarium-pubdevel mailing list > Ste...@li... > https://lists.sourceforge.net/lists/listinfo/stellarium-pubdevel > |