53 lines
2.4 KiB
Plaintext
53 lines
2.4 KiB
Plaintext
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GLCanvas class for wxWindows 1.66 using the GLX protocol extension
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==================================================================
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I have just uploaded a file 'wx166glx.tar.gz' to the wxWindows
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incoming directory. It contains an implementation of a GLCanvas class
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(interfacing an ordinary wxCanvas with OpenGL calls) for X11 (I tested
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with Motif, maybe it works with XView as well). I tried to imitate
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what Julian did in 'wxmesa1.zip' for MS Windows in conjunction with
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the Mesa library.
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Of the several possibilities to use OpenGL under X11, I chose the GLX
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server extension, because it is the most efficient method on machines
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with graphics hardware support (I expect wxWindows/OpenGL applications
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to _fly_ on my Indy :-). However, you don't need a 'real' OpenGL
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implementation to use GLCanvas -- the free Mesa library has a
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simulated GLX interface built-in. Just link in libMesaGLU and
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libMesaGL along with libwx_motif and everything should work fine.
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Installation:
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Untar wx166glx.tar.gz from your main wxWindows directory (i.e. where
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the `include' and `src' subdirectories are). Then apply the small
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patch file which has appeared in the `glx' subdirectory:
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% patch -p0 < glx/wx166-glx.diff
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Recompile the wx_motif library in the standard way. The inclusion of
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the GLCanvas class in libwx_motif is protected with a new 'USE_GLX'
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flag in wx_setup.h, so it could maybe be included in a future
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wxWindows release (with USE_GLX turned off by default).
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Two new samples (bounce and prim) are included. I adapted them from
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wxmesa1.zip -- they should compile under both MS Windows (with wxMesa)
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and X11. The makefile.unx's are set up for the Mesa libraries; if you
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have original libGLU/libGL's just change the GLLIBS = ... line.
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Problems:
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One more or less serious problem remains: the visual generated by the
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GLCanvas class must match the visual of wxCanvas.xwindow (which
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currently is always the screen's default visual). The end result is
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that you will get a nice RGB mode for OpenGL only if your display's
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default visual is TrueColor or DirectColor (the XFree86 S3 servers for
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PCs with the '-bpp 16/32' option are examples). I'm contemplating a
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solution where the wxCanvas drawingarea widget is destroyed and then
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re-created from within the GLCanvas constructor. I would welcome
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suggestions on this and discussions of the GLCanvas 'API'.
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Regards,
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Wolfram Gloger.
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(Gloger@lrz.uni-muenchen.de)
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