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SDL/docs/README-riscos.md
Cameron Cawley 27369b3e40 docs: Add README-riscos.md
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RISC OS

Requirements:

Compiling:

Currently, SDL2 for RISC OS only supports compiling with GCCSDK under Linux. Both the autoconf and CMake build systems are supported.

The following commands can be used to build SDL2 for RISC OS using autoconf:

./configure --host=arm-unknown-riscos --prefix=$GCCSDK_INSTALL_ENV --disable-gcc-atomics
make
make install

The following commands can be used to build SDL2 for RISC OS using CMake:

cmake -Bbuild-riscos -DCMAKE_TOOLCHAIN_FILE=$GCCSDK_INSTALL_ENV/toolchain-riscos.cmake -DRISCOS=ON -DCMAKE_INSTALL_PREFIX=$GCCSDK_INSTALL_ENV -DCMAKE_BUILD_TYPE=Release -DSDL_GCC_ATOMICS=OFF
cmake --build build-riscos
cmake --build build-riscos --target install

Current level of implementation

The video driver currently provides full screen video support with keyboard and mouse input. Windowed mode is not yet supported, but is planned in the future. Only software rendering is supported.

The filesystem APIs return either Unix-style paths or RISC OS-style paths based on the value of the __riscosify_control symbol, as is standard for UnixLib functions.

The audio, loadso, thread and timer APIs are currently provided by UnixLib.

GCC atomics are currently broken on some platforms, meaning it's currently necessary to compile with --disable-gcc-atomics using autotools or -DSDL_GCC_ATOMICS=OFF using CMake.

The joystick, locale and power APIs are not yet implemented.