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SDL/docs/README-emscripten.md
Philipp Wiesemann 0e45984fa0 Fixed crash if initialization of EGL failed but was tried again later. 
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly
uninitialized data structure if loading the library first failed. A later try to
use EGL then skipped initialization and assumed it was previously successful
because the data structure now already existed. This led to at least one crash
in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was
dereferenced to make a call to eglBindAPI().
2015-06-21 17:33:46 +02:00

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Emscripten

Build:

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

Or with cmake:

$ emconfigure cmake ..
$ 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

tests: https://dl.dropboxusercontent.com/u/17360362/SDL2-em/index.html

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...