Emscripten's lack of mainloop support and its goofy build system make it a nightmare to support. It will never be mainlined.

The original readme is below:

CSE2 is a decompilation of Cave Story, ported from DirectX to SDL2.

This branch allows the game to be compiled with Emscripten, enabling it to be played in a browser. This requires fairly extensive (and messy) modifications to the engine, to remove its dependency on "mainloops" - the infinite loops games put themselves in so they can run indefinitely. It's because of this that Emscripten support is limited to this branch: it's just so invasive.

Note: with CMake, if these are not found, they will be built locally

• SDL2
• FreeType
• FLTK

This project primarily uses CMake, allowing it to be built with a range of compilers.

In this folder, create another folder called 'build', then switch to the command-line (Visual Studio users should open the Developer Command Prompt) and cd into it. After that, generate the files for your build system with:

cmake .. -DCMAKE_BUILD_TYPE=Release

Emscripten users should do this instead:

emcmake cmake .. -DCMAKE_BUILD_TYPE=Release

You can also add the following flags:

• -DJAPANESE=ON - Enable the Japanese-language build (instead of the unofficial Aeon Genesis English translation)
• -DFIX_BUGS=ON - Fix bugs in the game (see src/Bug Fixes.txt)
• -DNONPORTABLE=ON - Enable bits of code that aren't portable, but are what the original game used
• -DFORCE_LOCAL_LIBS=ON - Compile the built-in versions of SDL2, FreeType, and FLTK instead of using the system-provided ones

Then compile CSE2 with this command:

cmake --build . --config Release

If you're a Visual Studio user, you can open the generated CSE2.sln file instead.

Once built, the executables and assets can be found in the newly-generated game folder.

Note: this requires pkg-config

Run 'make' in this folder ('make -f Makefile.emscripten' for Emscripten builds), preferably with some of the following settings:

• RELEASE=1 - Compile a release build (optimised, stripped, etc.)
• STATIC=1 - Produce a statically-linked executable (good for Windows builds, so you don't need to bundle DLL files)
• JAPANESE=1 - Enable the Japanese-language build (instead of the unofficial Aeon Genesis English translation)
• FIX_BUGS=1 - Fix bugs in the game (see src/Bug Fixes.txt)
• WINDOWS=1 - Enable Windows-only features like a unique file/taskbar icon, and system font loading (needed for the font setting in Config.dat to do anything)
• RASPBERRY_PI=1 - Enable tweaks to improve performance on Raspberry Pis
• NONPORTABLE=1 - Enable bits of code that aren't portable, but are what the original game used

Project files for Visual Studio .NET 2003 are available in the 'msvc2003' folder.

Visual Studio .NET 2003 was used by Pixel to create the original Doukutsu.exe, so these project files allow us to check the accuracy of the decompilation by comparing the generated assembly code to that of the original executable.

This option is strictly for checking the decompilation's accuracy; CMake should be preferred in all other situations.

Being a decompilation, the majority of the code in this project belongs to Daisuke "Pixel" Amaya - not us. We've yet to agree on a license for our own code.