Hey, Thanks a lot for giving me the example gears program.. It compiled without any problem.Infact i was able to run with the x-render option without any problems. But when i tried to give a.out -gl along with any TEST option( i gave GRAD) i am getting the error, "error constructing surface: the surface type is not appropriate for the operation." Any ideas on this??? Thanks, Guhan <div class="gmail_quote">On Sun, Nov 21, 2010 at 3:48 PM, Uli Schlachter <<a href="mailto:psychon@znc.in">psychon@znc.in</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="im">Am 21.11.2010 00:09, Steve Harrington wrote: > On 11/20/2010 02:20 PM, Luca Barbato wrote: >> On 11/19/2010 01:54 PM, guhan senthilkumar wrote: >> >>> Oh like that. Ok Ok.. :) >>> I have driver support for my GPU.. >>> >>> Do you have a working example with openGL backed.?? >>> Or just please help me get started with writing the most simplest of >>> applications with cairo and openGL backend. :) :) >>> >> <a href="http://cgit.freedesktop.org/%7Eanholt/cairogears" target="_blank">http://cgit.freedesktop.org/~anholt/cairogears</a> might help. >> >> lu >> >> > Helps a lot. Looking at the boilerplate I thought I must have been > mistaken to see so many raw Xlib calls but it seems that is the way this > backend is designed to be used. > > I do have one problem with cairogears however. I get an error > (cairogears.c line 364) when I run the program: > > LD_LIBRARY_PATH=$PREFIX/lib ./cairogears -gl GRAD > error constructing context: the surface type is not appropriate for the > operation > > although the gears window is drawn but not updated if I comment out the > exit(1) on line 367. If this is something obvious please let me know. > If not I'll probably run into it again as I adapt this code for my own use. </div>I took a look at this. The cairo_gl_surface_set_size call on line 369 causes a CAIRO_STATUS_SURFACE_TYPE_MISMATCH. Anyone got any idea why? Just commenting that line out makes it work (as long as you don't resize the window). Also, just for the fun of it, I added support for cairo's xcb backend (Ugly patch attached). It's ugly, but I wanted to see if there was some difference in speed between xcb and xlib. There isnt, but both are faster than gl here. Cheers, Uli -- Q: Because it reverses the logical flow of conversation. A: Why is putting a reply at the top of the message frowned upon? -- cairo mailing list <a href="mailto:cairo@cairographics.org">cairo@cairographics.org</a> <a href="http://lists.cairographics.org/mailman/listinfo/cairo" target="_blank">http://lists.cairographics.org/mailman/listinfo/cairo</a> </blockquote></div>