Need help: crosscompiling for windows (gfx colors flickering)

[Linus4]

Hey there,

I'm developing an application that I want to port to windows. But when I cross-compile from linux, the colors of most of the shapes I draw with the gfx library are flickering or are just wrong.

Cross-compiled on windows: Video Linux: Image

Weird things I've noticed:

• grenades (little rectangles flying across the map) have the correct color when drawn on the map, but have different colors for both the left and the right team in the infobars
• color-flickering of the player-circle on the map gets slower when there are less players alive; and it stays at the correct color when there is only one player alive
• the transparent filled circle indicating that a player is blinded by a flashbang is missing completely
• I don't need to put the SDL2_gfx.dll in the folder when I execute the program

What I did to cross-compile:

Using Fedora 30; mingw packages for sdl image and ttf are provided by the distro (mingw64-SDL2, mingw64-SDL2_image and mingw64-SDL2_ttf); go-sdl v0.3.3

1. download sdl2_gfx sources
2. mingw64-configure
3. mingw64-make
4. sudo mingw64-make install
5. env CGO_ENABLED="1" CC="/usr/bin/x86_64-w64-mingw32-gcc" GOOS="windows" CGO_LDFLAGS="-lmingw32 -lSDL2 -L/usr/x86_64-w64-mingw32/sys-root/mingw/lib/ -lSDL2_gfx" CGO_CFLAGS="-D_REENTRANT" go build -o csgoverview.exe -x *.go

Then I put these files into the same directory as the executable:

• .dem file (demo/replay) that I want to watch
• .jpg file matching the map from the demo
• liberationserif-regular.ttf (from my repo)
• libfreetype-6.dll
• libjpeg-9.dll
• SDL2.dll
• SDL2_image.dll
• SDL2_ttf.dll
• (SDL2_gfx.dll) this does not affect anything

I have no idea where I'm going wrong - any help would be greatly appreciated :)

PS: a few demos (= replays) for testing can be found here - but any demo should work just fine

[veeableful]

Hi @Linus4, could you try the v0.4.0-rc.0 version and build it statically?

You can modify go.mod like this:

-       github.com/veandco/go-sdl2 v0.3.3
+       github.com/veandco/go-sdl2 v0.4.0-rc.0

and run

CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc GOOS=windows GOARCH=amd64 go build -tags static -ldflags "-s -w"

In a Windows VM I tested, it seems to not flicker. If it works for you, this could be a temporary solution!

[Linus4]

Hi @veeableful , thank you so much for your help! :) Building the app statically with v0.4.0.-rc.0 works for me as well. 🎉