endless-sky emscripten progress

# Starting with Ubuntu 18.04.3 (LTS) x64
# I'm using a local VMwareFusion vm instead of Docker or something because I want to be able to test with a video device.

# New install
# (not shown) make account, enable ssh, add vm to /etc/hosts

ssh vm
apt-get update
sudo apt install git
git clone https://github.com/endless-sky/endless-sky.git
sudo apt install g++ \
   scons \
   libsdl2-dev \
   libpng-dev \
   libjpeg-dev \
   libgl1-mesa-dev \
   libglew-dev \
   libopenal-dev \
   libmad0-dev
(this is from readme-developer.txt in the repo)

cd endless-sky
scons
./endless-sky

# Ok so the project works when compiled normally.

cd
git clone https://github.com/emscripten-core/emsdk.git
cd emsdk
./emsdk install latest
./emsdk activate latest
source ./emsdk_env.sh

# Now to start changing things in the SConstruct file

# hardcode emscripten as CXX compiler
env['CXX'] = 'em++'

# use SDL
env['CXXFLAGS'] = '-s USE_SDL=2'

# At this point I start iterating on a new command, I'll port the changes back once I figure them out

em++ -o build/release/ImageBuffer.o -c -s USE_SDL=2 -s SDL2_IMAGE_FORMATS='["png", "jpg"]' -std=c++11 -Wall -O3 source/ImageBuffer.cpp

# Fix some errors
# bool / boolean
-               jpeg_read_header(&cinfo, true);
+               jpeg_read_header(&cinfo, boolean(true));

# can't find JCS_EXT_BGRA
# Just for now, I bet I still see SOMETHING if I take the alpha channel out?
-               cinfo.out_color_space = JCS_EXT_BGRA;
+               cinfo.out_color_space = JCS_BG_RGB;

# source/ImageBuffer.cpp is compiling now, so let's keep going!
# Running scons gives our next error:
# source/Music.cpp:17:10: fatal error: 'mad.h' file not found
# I wonder what mad is? looks like mpeg stuff
# https://packages.ubuntu.com/bionic/libmad0-dev
# I don't see this on https://github.com/emscripten-ports, is that the full list?
# I think I'm supposed to build it with emconfigure / make install, then change the linker path or something?

# Maybe it's time to go back to reading the emscripten tutorial.
# https://emscripten.org/docs/compiling/Building-Projects.html#using-libraries

# New command to iterate on: (this reproduces the error)
em++ -o build/release/Music.o -c -s USE_SDL=2 -s SDL2_IMAGE_FORMATS='["png", "jpg"]' -std=c++11 -Wall -O3 source/Music.cpp

apt install curl

curl 'http://archive.ubuntu.com/ubuntu/pool/universe/libm/libmad/libmad_0.15.1b.orig.tar.gz' --output libmad.tar.gz
tar xzf libmad.tar.gz

cd libmad-0.15.1b/

curl 'http://archive.ubuntu.com/ubuntu/pool/universe/libm/libmad/libmad_0.15.1b-9ubuntu18.04.1.diff.gz' --output libmad.diff.gz
gunzip libmad.diff.gz
patch -i libmad.diff


emconfigure ./configure
emmake make

# Lots of errors!
# clang-11: error: unknown argument: '-fforce-mem'
# clang-11: error: unknown argument: '-fthread-jumps'
# clang-11: error: unknown argument: '-fcse-follow-jumps'
# clang-11: error: unknown argument: '-fcse-skip-blocks'
# clang-11: error: unknown argument: '-fregmove'

# I wonder what to do about these. I think I should do more research in case there is a port somewhere out there.
# It looks like there is maybe? Something about SDL_mixer and a flag for libmad?
# https://github.com/emscripten-ports/SDL2_mixer
# I'm stopping for now, but I think I'm already where I got to last year when I tried to do this!