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On 8/28/22 11:29 holm.h...@gmail.com wrote:
Hi,
Seems like there is a example already under examples/OpenGL3test
I however have problems linking the code under linux:
*** Compile OpenGL3test.cxx...
g++ -I.. -I.. -I/usr/local/include -I/usr/include/freetype2
-I/usr/include/libpng16 -I/usr/include/freetype2
-I/usr/include/libpng16 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_THREAD_SAFE -D_REENTRANT -Wall -I. -c OpenGL3test.cxx -o OpenGL3test.o
*** Linking OpenGL3test...
g++ OpenGL3test.o ../lib/libfltk.a -lXrender -lXcursor -lXfixes -lXft
-lfontconfig -lXinerama -pthread -lpthread -ldl -lm -lX11
../lib/libfltk_images.a -ljpeg -lpng -lz ../lib/libfltk.a -lXrender
-lXcursor -lXfixes -lXft -lfontconfig -lXinerama -pthread -lpthread
-ldl -lm -lX11 -o OpenGL3test
OpenGL3test.o: In function `Fl_Gl_Window::mode(int)':
OpenGL3test.cxx:(.text._ZN12Fl_Gl_Window4modeEi[_ZN12Fl_Gl_Window4modeEi]+0x21):
undefined reference to `Fl_Gl_Window::mode(int, int const*)'
OpenGL3test.o: In function `Fl_Gl_Window::pixel_w()':
OpenGL3test.cxx:(.text._ZN12Fl_Gl_Window7pixel_wEv[_ZN12Fl_Gl_Window7pixel_wEv]+0x14):
undefined reference to `Fl_Gl_Window::pixels_per_unit()'
OpenGL3test.o: In function `Fl_Gl_Window::pixel_h()':
Any hints ?
Yes, please don't top-post in this group, it's hard to keep the context.
https://en.wikipedia.org/wiki/Posting_style#Top-posting
That aside, how did you compile/build? You are posting the error
message(s) but not your command which would have been really helpful.
AFAICT the OpenGL3 demos are not included in configure/make builds.
examples/Makefile
However, if you build with CMake you get them "for free" (set
FLTK_BUILD_EXAMPLES:BOOL=ON).
Finally: try to add "-lGLU -lGL -lGLEW" to your linker command. I tried
the following (you may do this as well in your environment, don't forget
"--use-gl"):
$ ../fltk-config --use-gl --compile OpenGL3test.cxx
g++ -I.. -I/usr/include/cairo -I/usr/include/glib-2.0
-I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1
-I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16
-I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16
-I/usr/include/cairo -I/usr/include/glib-2.0
-I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1
-I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT -o
'OpenGL3test' 'OpenGL3test.cxx' ../lib/libfltk_gl.a -lGLU -lGL
../lib/libfltk.a -lXrender -lXcursor -lXfixes -lXft -lfontconfig
-lXinerama -pthread -lpthread -ldl -lm -lX11
[error messages removed]
Now copy the commandline and add -lGLEW:
$ g++ -I.. -I/usr/include/cairo -I/usr/include/glib-2.0
-I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1
-I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16
-I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16
-I/usr/include/cairo -I/usr/include/glib-2.0
-I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1
-I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_THREAD_SAFE -D_REENTRANT -o
'OpenGL3test' 'OpenGL3test.cxx' ../lib/libfltk_gl.a -lGLU -lGL
../lib/libfltk.a -lXrender -lXcursor -lXfixes -lXft -lfontconfig
-lXinerama -pthread -lpthread -ldl -lm -lX11 -lGLEW
$
This worked for me. YMMV.
Note: my build includes Cairo and more, your command may be much shorter.
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