OpenGL 3.0, revisited
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OpenGL 3.0, revisited
by Paul Martz
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Hi all -- Here's my
main question:
I recently obtained
freeglut's current svn head, and it appears the the GLX code has been updated to
allow forward compatible context creation - great! But this isn't done for
Windows, as far as I can tell? If not, I'm more than willing to pitch
in and code this support, but I don't want to step on anyone's feet. Is anyone
actively working on this? What's the procedure for submitting
modifications?
And here's the background
info... I'm a long-time
OpenGL user, but new to freeglut and this list. I'm currently looking for a
cross-platform test bed to develop a series of OpenGL 3.0 example programs for
use in an OpenGL 3.0 course that I'll be teaching in the near future. Freeglut
seems like a great candidate. (OSG is another possibility.)
I just read through
the archives regarding OpenGL 3.0 support in freeglut and it looks like you've
covered all the major issues. However, I'll add the following info to the
discussion: The OpenGL 3.1 spec will be out very soon and it is highly likely
that all he 3.0-deprecated functionality will be removed. If the 3.1 spec comes
out in the next few weeks, 3.1-capable drivers are likely by
SIGGRAPH.
I understand the
quadric shapes, fonts, menus, etc., will require significant effort to port.
Right now I'm just looking for cross-platform 3.x context creation; I'll cross
the other bridges when I come to them, and would be glad to contribute my
changes back to the project. I understand we don't want to break
existing freeglut apps that will continue to open 2.x
contexts.
Thanks,
Paul Martz
Skew Matrix Software
LLC
+1 303 859 9466
------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ Freeglut-developer mailing list Freeglut-developer@... https://lists.sourceforge.net/lists/listinfo/freeglut-developer |
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Re: OpenGL 3.0, revisited
by Paul Martz
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Thanks, John, pleased to meet you. I remember Steve from the
comp.graphics.api.opengl days. I'll start plinking around with WGL_ARB_create_context. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ Freeglut-developer mailing list Freeglut-developer@... https://lists.sourceforge.net/lists/listinfo/freeglut-developer |
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Re: OpenGL 3.0, revisited
by Paul Martz
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FYI, I posted the modified files as a ZIP attachment, and my email is being
held for moderator approval. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ Freeglut-developer mailing list Freeglut-developer@... https://lists.sourceforge.net/lists/listinfo/freeglut-developer |
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Re: OpenGL 3.0, revisited
by Paul Martz
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I've sent my code directly to John. For the archives, here's the status and
my findings... -Paul WGL isn't GLX, obviously, and one big difference is you must load the device driver before you can query for supported WGL extensions, and the only way to do this is to make a context current. The existing freeglut code does this already in the case of multisampling. While setting up the pixel format, it creates a dummy window and context, makes them current, does what it needs to do for multisample, then deletes the dummy window and context. I do (sort of) the same thing as the multisampling code. After setting up the pixel format, freeglut creates a corresponding context, but doesn't make them current. With my changed code, right after context creation, freeglut calls into a new function, fgNewWGLCreateContext, which does a make current on the context and window, then queries for WGL_ARB_create_context. If found, it calls into the extension to create the new context, does a wglMakeCurrent(0,0), deletes the old context, and stores the new one in Window.Context. The rest of freeglut is none the wiser, and happily makes current with the new context that my code created. I've verified this works with a minimal example that queries the extension string and displays it. I get "3.0 NVIDIA 178.25". Oddly, deprecated 2.x functionality still works; I didn't think it would. I'll have to check the spec to see if this behavior is allowed. My context creation code is a clone of the GLX code except I don't bother displaying a warning if the app asks for a forward compatible context and also asks for color index mode. I assume context creation would fail in that case (though I haven't actually tested it). If there's a place in freeglut for a "hello world 3.x" example, I can put one together fairly quickly and submit it. Let me know if you're interested. When you commit my changes, let me know and I'll "svn co" to verify. Also let me know of any problems or anything I should redo. ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com _______________________________________________ Freeglut-developer mailing list Freeglut-developer@... https://lists.sourceforge.net/lists/listinfo/freeglut-developer |
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Re: OpenGL 3.0, revisited
by Sven Panne
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Am Donnerstag, 12. Februar 2009 16:03:51 schrieb Paul Martz:
> [...] > I've verified this works with a minimal example that queries the extension > string and displays it. I get "3.0 NVIDIA 178.25". > > Oddly, deprecated 2.x functionality still works; I didn't think it would. > I'll have to check the spec to see if this behavior is allowed. I am not sure if the OpenGL spec actually allows this, but I've read on several occasions (in forums, presentations, etc., see e.g. page 199 of http://www.slideshare.net/Mark_Kilgard/sigraph-asia-2008-modern-opengl- presentation) that NVIDIA doesn't really believe that deprecating API entries is the right way to go. It could very well be the case that their drivers do not (and probably never will) honor the "forward compatible" part of the GLX/WGL request. I do not agree with their point of view, but there is not much one can do about that... :-( The main point is that the new OpenGL 3.0 stuff works with the new context creation API. > [...] > If there's a place in freeglut for a "hello world 3.x" example, I can put > one together fairly quickly and submit it. Let me know if you're > interested. I think that a clean OpenGL 3.0 version of the famous smooth.c from the Red Book (displaying a smooth shaded triangle) would be a good hello world example. The best place for it would be somewhere below progs/demos. Another options would be an OpenGL 3.0 version of cube.c. Cheers, S. ------------------------------------------------------------------------------ _______________________________________________ Freeglut-developer mailing list Freeglut-developer@... https://lists.sourceforge.net/lists/listinfo/freeglut-developer |
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Re: OpenGL 3.0, revisited
by Sven Panne
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Am Freitag, 13. Februar 2009 04:23:12 schrieb John F. Fay:
> OK, it's into SVN. [...] FYI: I've cleaned up the code a little bit and made one functional change: If the GLUT API user has not called the new context creation functions at all (or if the default values have been specified), the new WGL context creation API is not called. This is consistent with the GLX behavior and a little bit more defensive. Never trust a code path only few people use, especially not in drivers... ;-) Cheers, S. ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Freeglut-developer mailing list Freeglut-developer@... https://lists.sourceforge.net/lists/listinfo/freeglut-developer |
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Re: OpenGL 3.0, revisited
by Sven Panne
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Am Donnerstag, 12. Februar 2009 16:03:51 schrieb Paul Martz:
> [...] > Oddly, deprecated 2.x functionality still works; I didn't think it would. > I'll have to check the spec to see if this behavior is allowed. [...] Small update: I am currently trying to write a a fully OpenGL-3.0-compliant version of smooth.c from the Red Book, which should end up in freeglut's progs/demos as a demo for the new glutInitContext* API entries. I've just noticed that if you request a forward-compatible 3.0 context, NVIDIA's 180.29 Linux driver sets GL's error state to GL_INVALID_OPERATION for deprecated stuff like glMatrixMode or glBegin! I think that this is great news, because this shows more OpenGL 3.0 commitment from NVIDIA than I actually thought, and one can actually start testing "pure" OpenGL 3.0. Cheers, S. ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Freeglut-developer mailing list Freeglut-developer@... https://lists.sourceforge.net/lists/listinfo/freeglut-developer |
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Re: OpenGL 3.0, revisited
by Sven Panne
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Am Freitag, 13. Februar 2009 04:23:12 schrieb John F. Fay:
> [...] > A simple demo--or even a modification to an existing demo--would be > appropriate. FYI: I've just committed the last changes for a fully OpenGL-3.0-compliant variant of the famous smooth.c from the Red Book. It would be good if other people reviewed the code and tested it on a few platforms. I've tested it only on openSUSE 11.1 x86_64 with NVIDIA's 180.29 drivers. A few personal observations: Currently writing "pure" OpenGL 3.0 is a bit tedious, because the information about what is deprecated and what the intended replacements are is either scattered around various documents or does not exist at all. Furthermore, some parts of the existing documentation is almost incomprehensible, e.g. the parts of the specs describing gl_FragCoord (deprecated, of course) and glBindFragDataLocation. :-P OpenGL 3.0 desperately needs better documentation and lots of tutorials, otherwise its acceptance will be quite low, I fear. Furthermore, some new official(!) GLU-like library for basic matrix stuff, shader handling, extension loading, etc. would be good, too, otherwise every "pure" OpenGL 3.0 code will contain quite a bit of boring boilerplate code. Cheers, S. ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Freeglut-developer mailing list Freeglut-developer@... https://lists.sourceforge.net/lists/listinfo/freeglut-developer |
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