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CSE2EX

CSE2EX is my personal build of CSE2, which features some enhancements:

  • Widescreen
  • Options menu:
    • Control remapping (keyboard and gamepad)
    • Soundtrack selection
    • V-sync toggle
    • 50FPS/60FPS toggle
    • Option to disable the design choice that locks sprites to a 320x240 grid when drawn, making them move smoother
  • Bugfixes

Supported platforms include...

  • Windows
  • Linux
  • macOS
  • Wii U
  • 3DS
  • RISC OS

Some of the above features will be axed soon, as the project completes its transition from CSE2's old enhanced branch to my personal build.

Screenshot

Dependencies

  • SDL2 (if BACKEND_AUDIO or BACKEND_PLATFORM are set to SDL2)
  • SDL (if BACKEND_AUDIO or BACKEND_PLATFORM are set to SDL1)
  • GLFW3 (if BACKEND_PLATFORM is set to GLFW3)
  • FreeType (if FREETYPE_FONTS is enabled)

If these are not found, they will be built locally (with the exception of SDL).

In addition, pkg-config is required for builds that require static-linkage.

A list of dependencies for specific platforms can be found on the wiki.

Building

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

(A beginner-friendly guide can be found in VISUAL_STUDIO_2019_GUIDE.md)

Switch to the terminal (Visual Studio users should open the Developer Command Prompt) and cd into this folder. After that, generate the files for your build system with:

cmake -B build -DCMAKE_BUILD_TYPE=Release

MSYS2 users should append -G"MSYS Makefiles" -DPKG_CONFIG_STATIC_LIBS=ON to this command, also.

You can also add the following flags:

Name Function
-DJAPANESE=ON Enable the Japanese-language build (instead of the unofficial Aeon Genesis English translation)
-DFIX_BUGS=ON Enabled by default - Fix various bugs in the game
-DDEBUG_SAVE=ON Re-enable the ability to drag-and-drop save files onto the window
-DLANCZOS_RESAMPLER=ON Use Lanczos filtering for audio resampling instead of linear-interpolation (Lanczos is more performance-intensive, but higher quality)
-DFREETYPE_FONTS=ON Enabled by default - Use FreeType2 to render the DejaVu Mono (English) or Migu1M (Japanese) fonts, instead of using pre-rendered copies of Courier New (English) and MS Gothic (Japanese)
-DBACKEND_RENDERER=OpenGL3 Render with OpenGL 3.2 (hardware-accelerated)
-DBACKEND_RENDERER=OpenGLES2 Render with OpenGL ES 2.0 (hardware-accelerated)
-DBACKEND_RENDERER=SDLTexture (Default) Render with SDL2's Texture API (hardware-accelerated) (note: requires -DBACKEND_PLATFORM=SDL2)
-DBACKEND_RENDERER=WiiU Render with the Wii U's GX2 API (hardware-accelerated)
-DBACKEND_RENDERER=3DS Render with the 3DS's Citro2D/Citro3D API (hardware-accelerated)
-DBACKEND_RENDERER=Software Render with a handwritten software-renderer
-DBACKEND_AUDIO=SDL2 (Default) Deliver audio with SDL2 (software-mixer)
-DBACKEND_AUDIO=miniaudio Deliver audio with miniaudio (software-mixer)
-DBACKEND_AUDIO=WiiU-Hardware Deliver audio with Wii U's AXVoice API (hardware-accelerated) (WARNING - currently broken: voices randomly disappear for unknown reasons)
-DBACKEND_AUDIO=WiiU-Software Deliver audio with Wii U's AXVoice API (software-mixer)
-DBACKEND_AUDIO=3DS-Hardware Deliver audio with 3DS's NDSP API (hardware-accelerated)
-DBACKEND_AUDIO=3DS-Software Deliver audio with 3DS's NDSP API (software-mixer)
-DBACKEND_AUDIO=Null Don't deliver audio at all (WARNING - game will have no audio)
-DBACKEND_PLATFORM=SDL2 (Default) Use SDL2 for miscellaneous platform-dependant operations
-DBACKEND_PLATFORM=GLFW3 Use GLFW3 for miscellaneous platform-dependant operations
-DBACKEND_PLATFORM=WiiU Use the Wii U's native APIs for miscellaneous platform-dependant operations
-DBACKEND_PLATFORM=3DS Use the 3DS's native APIs for miscellaneous platform-dependant operations
-DBACKEND_PLATFORM=Null Don't do platform-dependant operations at all (WARNING - game will have no video or input)
-DLTO=ON Enable link-time optimisation
-DPKG_CONFIG_STATIC_LIBS=ON On platforms with pkg-config, static-link the dependencies (good for Windows builds, so you don't need to bundle DLL files)
-DMSVC_LINK_STATIC_RUNTIME=ON Link the static MSVC runtime library, to reduce the number of required DLL files (Visual Studio only)
-DFORCE_LOCAL_LIBS=ON Compile the built-in versions of SDL2, GLFW3, and FreeType instead of using the system-provided ones
-DEXTRA_SOUND_FORMATS=ON Enable support for alternate music/SFX formats, include Ogg Vorbis, FLAC, and PxTone (not to be confused with PixTone)
-DCLOWNAUDIO_STB_VORBIS=ON Enable support for Ogg Vorbis music/SFX
-DCLOWNAUDIO_DR_FLAC=ON Enable support for FLAC music/SFX
-DCLOWNAUDIO_LIBXMPLITE=ON Enable support for .it, .xm, .mod, .s3m music/SFX
-DCLOWNAUDIO_PXTONE=ON Enable support for PxTone music/SFX (not to be confused with PixTone)

You can pass your own compiler flags with -DCMAKE_C_FLAGS and -DCMAKE_CXX_FLAGS.

You can then compile CSE2 with this command:

cmake --build build --config Release

If you're a Visual Studio user, you can open the generated CSE2.sln file instead, which can be found in the build folder.

Once built, the executables can be found in the game_english/game_japanese folder, depending on the selected language.

Building for the Wii U

To target the Wii U, you'll need devkitPro, devkitPPC, and WUT.

First, add the devkitPPC tools directory to your PATH (because WUT's CMake support is broken, as of writing):

PATH=$PATH:$DEVKITPPC/bin

Then, generate the build files with this command:

cmake -B buildwiiu -DCMAKE_BUILD_TYPE=Release -DFORCE_LOCAL_LIBS=ON -DBACKEND_PLATFORM=WiiU -DBACKEND_RENDERER=WiiU -DBACKEND_AUDIO=WiiU-Software -DCMAKE_TOOLCHAIN_FILE=$DEVKITPRO/wut/share/wut.toolchain.cmake

Finally, build the game with this command:

cmake --build buildwiiu

This will build a binary, but you still need to convert it to an .rpx file that can be ran on your Wii U.

First, we need to strip the binary:

powerpc-eabi-strip -g game_english/CSE2

Then, we convert it to an .rpx:

elf2rpl game_english/CSE2 game_english/CSE2.rpx

game_english/CSE2.rpx is now ready to be ran on your Wii U. This port expects the data folder to be in a folder called CSE2-enhanced-en/CSE2-enhanced-jp on the root of your SD card.

Building for the 3DS

To target the 3DS, you'll need devkitPro, devkitARM, Citro2D, Citro3D, libctru, and bannertool, along with the 3dstools and devkitpro-pkgbuild-helpers packages.

Open a terminal, and cd into the CSE2 directory. Then execute this command:

cmake -B build3ds -DCMAKE_BUILD_TYPE=Release -DFORCE_LOCAL_LIBS=ON -DBACKEND_PLATFORM=3DS -DBACKEND_RENDERER=3DS -DBACKEND_AUDIO=3DS-Software -DFREETYPE_FONTS=ON -DCMAKE_TOOLCHAIN_FILE=$DEVKITPRO/3ds.cmake

(Note that FREETYPE_FONTS is enabled. If you're creating a Japanese build, it's best to disable this, as the FreeType font is unreadable at 320x240).

This will create the build files. To build CSE2, run:

cmake --build build3ds

This will create an elf file. Before we can create a .3dsx file from it, we need to make an .smdh file:

bannertool makesmdh -i $DEVKITPRO/libctru/default_icon.png -s "CSE2" -l "Port of Cave Story" -p "Clownacy" -o build3ds/smdh.smdh

We can finally generate a .3dsx file:

3dsxtool game_english/CSE2 game_english/CSE2.3dsx --romfs=game_english/data --smdh=build3ds/smdh.smdh

Licensing

Being a decompilation, the majority of the code in this project is proprietary and belongs to Daisuke "Pixel" Amaya.

Modifications and custom code are made available under the MIT licence. See LICENCE.txt for details.