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SDL/docs/README-emscripten.md
Ryan C. Gordon 1b895912a2 docs: Note the lowest supported Emscripten version. 
Reference Issue #6304.
2022-09-30 14:23:54 -04:00

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Emscripten

SDL currently requires at least Emscripten 2.0.32 to build. Newer versions are likely to work, as well.

Build:

$ mkdir build
$ cd build
$ emconfigure ../configure --host=asmjs-unknown-emscripten --disable-assembly --disable-threads --disable-cpuinfo CFLAGS="-O2"
$ emmake make

Or with cmake:

$ mkdir build
$ cd build
$ emcmake cmake ..
$ emmake make

To build one of the tests:

$ cd test/
$ emcc -O2 --js-opts 0 -g4 testdraw2.c -I../include ../build/.libs/libSDL2.a ../build/libSDL2_test.a -o a.html

Uses GLES2 renderer or software

Some other SDL2 libraries can be easily built (assuming SDL2 is installed somewhere):

SDL_mixer (http://www.libsdl.org/projects/SDL_mixer/):

$ EMCONFIGURE_JS=1 emconfigure ../configure
build as usual...

SDL_gfx (http://cms.ferzkopp.net/index.php/software/13-sdl-gfx):

$ EMCONFIGURE_JS=1 emconfigure ../configure --disable-mmx
build as usual...