[osg-users] freetype build support on Windows

[Robert Osfield]

HI Stuart,

It sounds like taking the CMake FindFreetype.cmake modifying to work
and then getting this checked over by the cmake community as being
suitable for them to merge and then sending the final rev along to me
to merge would enable us to roll out the improved support prior to the
next CMake release.  If the CMake release is made before we push out
3.6 then we wouldn't need to add it locally.

With the freetype wiring to PNG+ZLIB, this sounds like the could
improve things with their own source/build system.  I don't know
freetype well enough to know how easy it would be to fix things to
make it easier to switch.  This type of issue is why the OSG has
plugins and NodeKits - the core libraries are kept with minimal
dependencies, this way the dependency chain doesn't pollute anything
more than it needs to.

Robert.



On 5 June 2016 at 02:35, Stuart Mentzer <Stuart_Mentzer at objexx.com> wrote:
> Hi Robert,
>
> I have asked the CMake community about updating their FindFreetype.cmake to
> support Windows debug library naming and I will follow up to try and get
> that fixed in upcoming releases. I was pointed to how they do it correctly
> for zlib so I could make a variant of their FindFreetype.cmake for OSG to
> use until their fix is released. This would retain their support for the old
> and new include structure. If you'd like me to submit that let me know.
>
> Wrt the PNG on/off issue, I now understand the approach they use. The upshot
> is that as long as you refresh the freetype source tree you are building
> with from the original code before each build you can switch PNG support on
> or off in the cmake command with -DWITH_PNG=ON or OFF and without manually
> editing ftoption.h. (Same holds for ZLIB support.) The reason is that the
> build goes in and modifies ftoption.h in the source tree (as well as making
> a copy in the build tree) and the modification only uncomments those
> defines, so you can't build with PNG enabled and then PNG disabled without
> refreshing the source first. This is an unfortunate approach but that is
> what we are stuck with. Most builders don't switch the PNG or ZLIB support
> on and off so this probably doesn't often trip people up. The best we can
> probably do is add a note on an appropriate wiki page. I added this refresh
> step to my build scripts.
>
> Stuart
>
> On 6/4/2016 3:36 PM, Robert Osfield wrote:
>
> Hi Stuart,
>
> It sounds like the version of Freestyle is broken or it requires a tweak to
> configuration. Have you approached the freetype community about these
> issues.
>
> The debug vs release issue is something that would be worth raising with the
> cake community as it sounds like a revision to their Findfreetype.cmake.
>
> Robert
>
> On 3 Jun 2016 11:24 p.m., "Stuart Mentzer" <osgforum at tevs.eu> wrote:
>>
>> Hi Robert,
>>
>> Here's what I found doing release and debug builds from yersterday's git
>> master code with Visual C++ 2015:
>>
>> freetype even using -DWITH_PNG=OFF will still try to include png.h and for
>> some reason requires ftoption.h (both copies) to be modified (or overridden)
>> to comment out the line:
>> #define FT_CONFIG_OPTION_USE_PNG
>> This is unfortunate and actually makes it easier to build freetype with
>> PNG support. With the freetype mods OSG builds including the freetype
>> plugin. Configuring freetype with or without PNG support is up to the
>> builder but it would be good if the CMakeLists.txt could handle both
>> situations without needing changes like I made.
>>
>> The freetype build headers under include\freetype2\freetype even though
>> freetype doesn't use that freetype2 layer anymore. Not a big deal since OSG
>> doesn't really need to ship with freetype or other 3rd party lib headers.
>>
>> The debug build is able to build freetype with the same mods but the OSG
>> build doesn't find it:
>> -- Could NOT find Freetype (missing:  FREETYPE_LIBRARY) (found version
>> "2.6.3")
>> which I assume is due to not looking for the name freetyped, as I found
>> with my OSG 3.4.0 build. So the OSG build can complete but it won't build
>> the freetype plugin.
>>
>> The debug build fails at "Installing the project..." because it appears
>> something is wrong with the new pdb installation support:
>> -- Installing: C:/OSG.VC.xd/bin/osgd.dll
>> CMake Error at src/osg/cmake_install.cmake:39 (file):
>>   file INSTALL cannot find
>>   "C:/Projects/OSG/VC.xd/OSG/src/osg/PREFIX-NOTFOUNDosgd.pdb".
>> Call Stack (most recent call first):
>>   src/cmake_install.cmake:33 (include)
>>   cmake_install.cmake:100 (include)
>> The osgd.pdb file is present and next to osgd.dll as expected.
>>
>> I see that others are reporting success with the Visual C++ 2015 build but
>> I don't know how they are addressing the freetype PNG issues or if they
>> tried the debug build yet. It looks like there are still some issues but
>> maybe they will offer some input here. I'm happy to make another pass if
>> that helps.
>>
>> Stuart
>>
>> ------------------
>> Read this topic online here:
>> http://forum.openscenegraph.org/viewtopic.php?p=67406#67406
>>
>>
>>
>>
>>
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>
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