* Pass the same compiler flags like make.
* Update FindSDL2.
* Remove unneeded FindOggVorbis.
There still some options missing, like the RPATHes or he ability to
define the system wide installation directory.
I've chosen the minimal invasive way for this:
* Import miniz and remove -lz linker flags.
* Create a short header minizconf.h roviding everything we need
originally defined by zconf.h and not provided by miniz.
* Replace zlib.h with miniz.h and minizconf.h.
The input system backend was once used in the client and the renderers,
but for some years now it has been an integral part of the client only.
Move it there.
* CDA was only supported of the client was build with SDL 1.2. Our
Windows binaries had no CDA support for years, I'm pretty sure that
it never worked on Linux and no computer build after 2005 has even
the necessary hardware. So let's just remove it.
* X11GAMMA was a hack to work around SDL 1.2s inability to set the
gamma on newer xorg-server versions. It has been broken for some
time now an is rather ugly. Remove it.
This is the first step in removing SDL 1.2 support.
FreeBSD has supported printing backtraces for years. The API is the same
as on Linux, the only difference is that libexecinfo must be linked as a
seperate library. Since the last FreeBSD version with backtrace support
(FreeBSD 9.3) went out of support some time ago unconditionally enable
the printing.
By default minizip uses fopen64(), fseek64() and so on. Those may not
be defined on all system, especially the BSDs. While FreeBSD already
has a special case, for example OpenBSD hasn't. Work around this by
forcing minizip to use fopen(), fseek() and so on everything that's not
Linux or Windows. This is not 100% correct, it may prevent the usage of
ZIPs lager than 2GB on Solaris and other rarely used systems. But I
doubt that anyone has such large ZIPs with assets, they would likely hit
other internal limits.
In the future Quake II should use off_t instead of int were applicable.
With that we could set -D_FILE_OFFSET_BITS=64.
This change is based upon a patch send by @devnexen in pr #279.
There's no need to duplicate machine independent parts of the client
initialization and the main loop for every platform.
While at it remove the nearly empty unix.h header and move Windows
main() into an own file. Not both platform have the same basic layout.
Before we can ship the softrenderer in the default install we'll need to
clean up the cvars. Currently the softrenderer is using the gl_* cvars
which is confusing.
The variable yquake2RendererLinkerFlags is used to store the linker flags for opengl but the empty variable yquake2OpenGLLinkerFlags is used when linking libraries to the renderer.
Also there's no need to link the opengl libs to the opengl3 renderer when the glad extension loader is being used.
The CMakeLists.txt used the same linker flags for all target, grossly
overlinking q2ded and both render libraries. Fix this by introducing
fine grained variables holding the linker flags.
