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213 lines
8.3 KiB
Plaintext
213 lines
8.3 KiB
Plaintext
Glut then!
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By Jean-Seb on Friday July 10, 2009, 00:18
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Translated by Babelfish with a scrub from John F. Fay. For points of confusion
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please refer to the original French version.
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Freeglut is an open-source evolution of GLUT.
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Under Windows, one can use it with Cygwin.
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Easy? Yes, if one agrees to distribute "cygwin1.dll".
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Let us help freeglut gain its independence !
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m.à.j 10/7/2009: generation of a library for linking without the DLL.
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Recovery of the sources
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* Download the sources of version 2.6.0 which integrates recent changes.
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* For the moment, it is a RC (Release Candidate), but the final version
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should not delay.
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* The use of the 2.6 is preferable with the 2.4-stable branch because many
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bugs have been corrected.
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* You will find the sources on the site of Freeglut:
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o http://freeglut.sourceforge.net/
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Objectives and preparation
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Objectives
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* We will create a DLL related to Cygwin, and an independent static library
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* We will also create a dynamic library, allowing linking with the DLL.
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List of generated files
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* freeglut.dll: a traditional DLL for the dynamic linkage.
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* libfreeglut.a: the static library. The final program is autonomous (at
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least for OpenGL).
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* libfreeglutdll.a: the dynamic library. The final program needs
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freeglut.dll.
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Preparation
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* Extract the files from the freeglut archive.
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* Go in the directory src (located at the root of the Freeglut directory),
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and create a "Gl" sub-directory
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o In this sub-directory, copy the files of the directory "include/Gl"
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* Why is it necessary to create a "Gl" directory for compilation?
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o I needed it to simplify things during my tests.
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o If not you can create the repertories directly, and copy the files
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as indicated in the point installation (see below).
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* Do a little housekeeping in /lib:
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o Erase all the references to the glut, so as not to conflict with the
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linking.
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o This stage is optional, you can also choose to do the housekeeping
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only after a successful compilation of Freeglut.
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o In your enthusiasm to clean things up, be careful not to erase the
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library glu32.lib (not to be confused with glut32.lib).
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Compilation
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* Forget the "./configure, make, make install" triptych.
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o It does not go at all with Cygwin.
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* Here Makefile which will make the deal:
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#Makefile for Freeglut 2.6.0-rc and Cygwin
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#To place in the directory “src”
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sources=$ (wildcard *.c)
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objs=$ (sources: .c=.o)
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libname=freeglut
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CFLAGS=-O2 - DTARGET_HOST_MS_WINDOWS - DX_DISPLAY_MISSING - DFREEGLUT_STATIC - I./
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LDFLAGS=-lopengl32 - lgdi32 - lwinmm
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nocyg=-mno-cygwin - mwindows
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all: $ (objs)
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#construction DLL related to cygwin1.dll
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GCC $ (nocyg) $ (objs) - shared $ (LDFLAGS) - O $ (libname) .dll
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Nm $ (libname) .dll | awk “BEGIN {print “EXPORTS”} /T _glut/{sub (/^.*T _/,” \ T "); print}” > $ (libname) .def
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dlltool --dllname $ (libname) .dll --input-def $ (libname) .def --output-lib lib$ (libname) dll.a
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#construction static library independent of cygwin
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rear Cr lib$ (libname) .a $ (objs)
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#pas inevitably obligatory (creation of an index to accelerate the accesses)
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ranlib lib$ (libname) .a
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%.o: %.c
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GCC $ (nocyg) - C $ (CFLAGS) $<
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clean:
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rm - F *.o $ (libname) .dll $ (libname) .def lib$ (libname) dll.a lib$ (libname) .a
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Some remarks on the makefile
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* This makefile creates a DLL, a static library (a file, in other words) and
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the dynamic library which will allow the use of the DLL.
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* Do not try to strip the static library! You may not be able to compile
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applications with static library any more.
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o On the other hand, you can strip the final executable obtained after
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compiling your application.
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* I chose to call the DLL and the libraries by their "true names":
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freeglut.dll libfreeglutdll.a and libfreeglut.a.
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o Script configures recreated (for reasons of compatibility with the
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old GLUT library) glut.dll and libglut.a.
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o During the my tests, I had conflicts with an authentic "glut" which
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trailed in my "/lib". I decided to call the things by their name, in
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order to avoid confusions.
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o Nothing prevents you from renaming the DLL, if you need to use GLUT
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programs which you cannot recompile.
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* The dynamic library is generated starting from the DLL.
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o For reasons of brevity, I used awk. It generates the export file
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used by dlltool.
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o The only notable thing is the selection of the functions whose name
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starts with _glut, in order to avoid including in the dynamic
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library the functions that are not related to freeglut.
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o then, one uses dlltool in a very traditional way.
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Nm $ (libname) .dll | awk “BEGIN {print “EXPORTS”} /T _glut/{sub (/^.*T _/,” \ T "); print}” > $ (libname) .def
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dlltool --dllname $ (libname) .dll --input-def $ (libname) .def --output-lib lib$ (libname) dll.a
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Installation
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* Copy libfreeglut.a, libfreeglutdll.a into the Cygwin directory /lib.
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* Copy freglut.dll in the system32 of Windows (this is practical, but not
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clean!).
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* Copy the files headers of Freeglut (/include/gl) into the Cygwin directory
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/usr/include/Gl.
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* Copy the files headers (always /include/gl) into /usr/include/mingw/Gl:
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this is used for compilations with the flag - mno-cygwin, which uses the
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includes in mingw.
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o You may need to erase the old GLUT include files if you installed it
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with Cygwin.
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Use of the library
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* We will test with the program shapes, found in progs/demonstrations/shapes
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o -mno-cygwin is used to force the use of Mingw without the large
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dependence cygwin1.dll.
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o -mwindows is only used to remove the horrible Shell window (very
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useful for the settling, on the other hand).
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o -L. (note the period after the "L"): I left libfreeglut.a,
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libfreeglutdll.a and freeglut.dll in the test directory, at the time
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of the tests.
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Compilation of the static freeglut library, without cygwin
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* All the simplicity lies in the define: -DFREEGLUT_STATIC
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o It serves to obtain good decoration of the function names in the
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imports of the lib Freeglut.
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o You can test without and use a hex editor to see the differences
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in the objects.
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* attention with the order of the libraries: -lfreeglut (static) must be
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before the declaration of the dynamic libraries.
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* gcc shapes.c -L. -lfreeglut -lopengl32 -lwinmm -lgdi32 -mno-cygwin -mwindows -DFREEGLUT_STATIC
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Compilation with DLL freeglut, without cygwin
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* For the define, see the notices above
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* The order of the libraries is no longer important.
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* gcc shapes.c -L. -lopengl32 -lwinmm -lgdi32 -lfreeglut -mno-cygwin -DFREEGLUT_STATIC
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Compilation with DLL freeglut, Cygwin
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* This example is given only for reference, the topic of this ticket being
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to get rid of Cygwin.
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o Let us say that can be used to make the point (and later).
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* gcc shapes.c -L. -lopengl32 -lwinmm -lgdi32 -lfreeglut
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Where are the dooooocs?
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* Freeglut is delivered with its documentation, more very up to date.
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o It seems that there is a problem with the original GLUT
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documentation. Not only it does not correspond completely to the
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operation of Freeglut, but moreover, its author (Mark Kilgard)
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copyrighted it. Its distribution is thus difficult.
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* Jocelyn Fréchot undertook a levelling of the docs for version 2.6.0. One can find them on his site for the moment:
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o http://jocelyn.frechot.free.fr/freeglut/
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Something survived…
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* I also tested the recompiling of the demonstrations of the original lib
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GLUT (peace with its ashes).
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o Nothing in particular to be announced.
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* Thank you with all the courageous maintainers for Freeglut, that one
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believed dead, but which still move.
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