[Flightgear-users] how do I disable 'dynamic' textures?
Can I keep FG from going back into plib and fiddling with textures once the sim is up/initialized!? I'm using a custom texture that I created using OpenGL directly (instead of via plib) and I'm getting HOSED when FG decides to go load new textures (... or when it does whatever it does when it starts making calls to ssgLoadTextures, ssgMakeMipMaps, etc., after the sim is executing). AArrgh! Are there any reasons why plib wouldn't let me build/use my own textures? (... I posted a similar question on the plib-users list to see if I get any replies) Why does FG need to load anything once the sim is executing? Are textures not allocated/created by FG until they're needed? Can this 'load-it-as-you-go' behavior be replaced with a 'load-everything' approach? What are the consequences? Thanks, D ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] how do I disable 'dynamic' textures?
I'm religiously preserving the OpenGL state around everything that I'm doing (glPushAttrib() and glPopAttrib() with GL_ALL_ATTRIB_BITS). Is there something more bulletproof? Glad to know that FlightGear uses non-plib textures, too. Can you point me to a place in the source code where this occurs? To rephrase my initial question, is there a way to limit the world in which FlightGear operates to, say, 100 sq miles around my home airport and force it to load everything it needs up front (thus avoiding the '12 GB of data' consequence)? Thanks for the help. D Original message Date: Wed, 26 Jan 2005 09:36:20 -0600 From: Curtis L. Olson [EMAIL PROTECTED] Subject: Re: [Flightgear-users] how do I disable 'dynamic' textures? To: FlightGear user discussions flightgear-users@flightgear.org D Wysong wrote: Can I keep FG from going back into plib and fiddling with textures once the sim is up/initialized!? I'm using a custom texture that I created using OpenGL directly (instead of via plib) and I'm getting HOSED when FG decides to go load new textures (... or when it does whatever it does when it starts making calls to ssgLoadTextures, ssgMakeMipMaps, etc., after the sim is executing). AArrgh! One thing you need to understand in OpenGL is state management. FlightGear is a complex program that needs to set different opengl parameters (i.e. states) in a number of different places in the code. If one section of the code isn't careful and doesn't reset things correctly, or makes some other wierd changes, then this could cause problems later. Think about it like someone giving you turn by turn directions. If they don't tell you to turn at all the right places, and in the right order, you aren't going to end up where you want to go. Are there any reasons why plib wouldn't let me build/use my own textures? (... I posted a similar question on the plib-users list to see if I get any replies) This should all work fine. FlightGear has places where it loads or builds it's own textures too. Why does FG need to load anything once the sim is executing? Are textures not allocated/created by FG until they're needed? Can this 'load-it-as-you-go' behavior be replaced with a 'load-everything' approach? What are the consequences? What are the consequences of loading 12Gb of world data and associated textures and code all at once into main RAM? I would hunt for an opengl state management issue in your code. Also, don't forget that you must do all your texture loading in the main thread. If you mix opengl calls in different threads, they will get mixed arbitrarily and sent to the single opengl context, and you will get unpredictable results ... well actually you'll most likely get a program crash. Regards, Curt. -- Curtis Olsonhttp://www.flightgear.org/~curt HumanFIRST Program http://www.humanfirst.umn.edu/ FlightGear Project http://www.flightgear.org Unique text:2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] how do I disable 'dynamic' textures?
Here's the deal -- I'm projecting NTSC video frames (my textures) onto a 'screen' that I've placed under the HUD b/c I'd really like to use the synthetic scenery as a backdrop for live flight video (UAV groundstation). It works... except for this texture conflict thing I keep getting hit with. My textures (video frames) are actually being loaded and displayed by FlightGear just fine (I can send pics!)... which leads me to believe the attributes are Ok. I'll glPush the attributes specifically to see if it helps, though. I'm also following the rules (glGenTextures, etc) to keep from conflicting with everyone else. I'm using the C-172 w/ 2D panel and my class calls are all made from within hud.cxx. I'm calling my Init() method (allocates the system memory region for the frame grabber) when the HUD is turned on via the masterswitch (h). I'm calling my Render() method (gets/displays a scaled subimage of the grabbed frame) from within drawHud(). Is this within the main thread that Curtis is talking about? Should I be doing this stuff elsewhere? If I let the sim come up and then enable the HUD (h), my video happily appears. The segfault I'm seeing only occurs (according to gdb traces) when FlightGear begins to load/allocate other textures. This appears to occur when I either (1) leave the immediate area, or (2) attempt to minimize the panel (s) AFTER I activate my video. If I minimize the panel (thus getting all of the texture init stuff out of the way) and THEN activate my video (h), I can switch back and forth between the 2D panel and mini panel all day with my video active.. Another question -- can I use plib to manage what I'm doing if my texture data is already in memory instead of in a file? I poked at the classes in ssg but all I found were load() methods that used filenames. I can write a class... but if it's already there I'd rather avoid the extra work. D --- Curtis L. Olson wrote: D Wysong wrote: I'm religiously preserving the OpenGL state around everything that I'm doing (glPushAttrib() and glPopAttrib() with GL_ALL_ATTRIB_BITS). Is there something more bulletproof? Hmmm, I seem to recall that there are some issues with glPush/PopAttrib(). I don't think they handle *every* possible state change, just the more common ones. You need to carefully read the opengl manual to make sure that the things you are changing are indeed covered with glPush/PopAttrib(). Also, I think we've found occaisional bugs where glPush/PopAttrib() doesn't always work as advertised. If your modified app is crashing, I suspect that either you will eventually find a state management problem, you are trying to do opengl calls outside of the main render thread, or you have a bug and are doing something (or a sequence of somethings) that opengl thinks is illegal or can't deal with. Glad to know that FlightGear uses non-plib textures, too. Can you point me to a place in the source code where this occurs? The opening splash screen does this, as does the 2d instrument panels. Cloud textures might also be loaded outside of plib. Curt. ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] how do I disable 'dynamic' textures?
Problem solved. I was using glPixelStore to set the image pixel width of my textures and it wasn't being properly reset. glPushAttrib/glPopAttrib doesn't give any protection for this so I had to manually reset the parameter (Good call, Curt!). Thanks for the help, everyone. ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] how do I disable 'dynamic' textures?
We'll fly the system on a manned aircraft in the Spring and will capture plenty of video. I'm looking forward to seeing how the actual scenery corolates with what FlightGear generates! I'll certainly post a link once we've captured something worth looking at. D Original message Date: Wed, 26 Jan 2005 16:05:09 -0600 From: Curtis L. Olson [EMAIL PROTECTED] Subject: Re: [Flightgear-users] how do I disable 'dynamic' textures? To: FlightGear user discussions flightgear-users@flightgear.org D Wysong wrote: Problem solved. I was using glPixelStore to set the image pixel width of my textures and it wasn't being properly reset. glPushAttrib/glPopAttrib doesn't give any protection for this so I had to manually reset the parameter (Good call, Curt!). Thanks for the help, everyone. Glad you got it working! Your project sounds really intersting. If you can share any video or picts, that would be great. Regards, Curt. -- Curtis Olsonhttp://www.flightgear.org/~curt HumanFIRST Program http://www.humanfirst.umn.edu/ FlightGear Project http://www.flightgear.org Unique text:2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] how do I disable 'dynamic' textures?
... looking forward to seeing how the actual scenery CORRELATES, that is. Stupid spell cheakcer! :-) Original message Date: Wed, 26 Jan 2005 20:04:35 -0600 From: D Wysong [EMAIL PROTECTED] Subject: Re: [Flightgear-users] how do I disable 'dynamic' textures? To: FlightGear user discussions flightgear-users@flightgear.org We'll fly the system on a manned aircraft in the Spring and will capture plenty of video. I'm looking forward to seeing how the actual scenery corolates with what FlightGear generates! I'll certainly post a link once we've captured something worth looking at. D Original message Date: Wed, 26 Jan 2005 16:05:09 -0600 From: Curtis L. Olson [EMAIL PROTECTED] Subject: Re: [Flightgear-users] how do I disable 'dynamic' textures? To: FlightGear user discussions flightgear-users@flightgear.org D Wysong wrote: Problem solved. I was using glPixelStore to set the image pixel width of my textures and it wasn't being properly reset. glPushAttrib/glPopAttrib doesn't give any protection for this so I had to manually reset the parameter (Good call, Curt!). Thanks for the help, everyone. Glad you got it working! Your project sounds really intersting. If you can share any video or picts, that would be great. Regards, Curt. -- Curtis Olsonhttp://www.flightgear.org/~curt HumanFIRST Program http://www.humanfirst.umn.edu/ FlightGear Project http://www.flightgear.org Unique text:2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
