# 2023-10-09

## Hallelujah

I finally got a cross-platform build for kge [1] that builds binaries
in Linux, MacOS, and Windows. I had to do some trickery with the Windows
side, and it really only builds in CLion. That works for me; it builds on
the command line in MacOS and Linux just fine. I mostly just want it to
run in Windows on my desktop. There was something about copying SDL2.dll
to system32, and I think a few other things.

The other major Windows adjustment was to disable freetype. The way I came
up to do this is to have

    find_package(Freetype)
    if (DEFINED FREETYPE_INCLUDE_DIRS)
            add_definitions(-DIMGUI_ENABLE_FREETYPE)
            set(FREETYPE_SOURCES
                    ext/imgui/misc/freetype/imgui_freetype.cpp
                    ext/imgui/misc/freetype/imgui_freetype.h)
    endif()

Then, for example, you can later say something like the fourth line below:

    target_link_libraries(imgui
            PUBLIC
            OpenGL::GL
            $<IF:$<TARGET_EXISTS:Freetype::Freetype>,Freetype::Freetype,>
            $<TARGET_NAME_IF_EXISTS:SDL2::SDL2main>
            $<IF:$<TARGET_EXISTS:SDL2::SDL2>,SDL2::SDL2,SDL2::SDL2-static>)

I managed to do this without conan, which would just add more complications
to the system.

## Shifting arrays

Working on the Buffer class [2] in klib [3], I needed to shift the backing
array left or right for insertions and deletions. This is fraught with peril
(a phrase I used several times today in our team sync), but fortunately I
remembered that memmove(3) exists. I'm sure there's a better C++ version,
but this works for now. I did goof at first with one of the moves:

    // Wrong!
    memmove(this->contents+offset, this->contents+(offset+delta),
            this->length);


    // Fixed!
    memmove(this->contents+(offset+delta), this->contents+offset,
            this->length);

There were a few minor goofs (an i++ instead of an i--, for example), but
I've been testing it out with a simple test program that I can also run
valgrind on.


[1] https://git.wntrmute.dev/kyle/kge
[2] https://git.wntrmute.dev/kyle/klib/src/branch/master/Buffer.h
[3] https://git.wntrmute.dev/kyle/klib/