add dedicated backend (WIP)

luigi/backend/ffisdl/sdl2/LICENSE

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+Copyright (c) 2011-2014 Idiap Research Institute (Ronan Collobert)
+Copyright (c) 2012-2014 Deepmind Technologies (Koray Kavukcuoglu)
+Copyright (c) 2011-2012 NEC Laboratories America (Koray Kavukcuoglu)
+Copyright (c) 2011-2013 NYU (Clement Farabet)
+Copyright (c) 2006-2010 NEC Laboratories America (Ronan Collobert, Leon Bottou, Iain Melvin, Jason Weston)
+Copyright (c) 2006      Idiap Research Institute (Samy Bengio)
+Copyright (c) 2001-2004 Idiap Research Institute (Ronan Collobert, Samy Bengio, Johnny Mariethoz)
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. Neither the names of Deepmind Technologies, NYU, NEC Laboratories America 
+   and IDIAP Research Institute nor the names of its contributors may be 
+   used to endorse or promote products derived from this software without 
+   specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.

luigi/backend/ffisdl/sdl2/README.md

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+sdl2-ffi
+========
+
+A LuaJIT interface to SDL2
+
+# Installation #
+
+First, make sure SDL2 is installed on your system. This package only requires the binary shared libraries (.so, .dylib, .dll).
+Please see your package management system to install SDL2. You can also download yourself binaries on the
+[SDL2 web page](http://libsdl.org/download-2.0.php)
+
+```sh
+luarocks install https://raw.github.com/torch/sdl2-ffi/master/rocks/sdl2-scm-1.rockspec
+```
+
+*Note*: this SDL interface supports only SDL2, not SDL 1.2.
+
+# Usage #
+
+```lua
+local sdl = require 'sdl2'
+sdl.init(sdl.INIT_VIDEO)
+...
+```
+
+All SDL C functions are available in the `sdl` namespace returned by require. The only difference is the naming, which is not prefixed
+by `SDL_` anymore. The same goes for all C defines (like `SDL_INIT_VIDEO`, which can now be accessed with `sdl.INIT_VIDEO`).
+
+Although the interface is quite complete, there are still few defines not ported in this package. Fill free to post a message about it,
+or to request pulls.
+
+

luigi/backend/ffisdl/sdl2/defines.lua

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+-- Function definitions which were not output by
+-- the C preprocessor
+
+local sdl
+
+local function registerdefines(sdl)
+
+   -- audio
+
+   function sdl.AUDIO_BITSIZE(x)
+      return bit.band(x, sdl.AUDIO_MASK_BITSIZE)
+   end
+
+   function sdl.AUDIO_ISFLOAT(x)
+      return bit.band(x, sdl.AUDIO_MASK_DATATYPE) ~= 0
+   end
+
+   function sdl.AUDIO_ISBIGENDIAN(x)
+      return bit.band(x, sdl.AUDIO_MASK_ENDIAN) ~= 0
+   end
+
+   function sdl.AUDIO_ISSIGNED(x)
+      return bit.band(x, sdl.AUDIO_MASK_SIGNED) ~= 0
+   end
+
+   function sdl.AUDIO_ISINT(x)
+      return not sdl.AUDIO_ISFLOAT(x)
+   end
+
+   function sdl.AUDIO_ISLITTLEENDIAN(x)
+      return not sdl.AUDIO_ISBIGENDIAN(x)
+   end
+
+   function sdl.AUDIO_ISUNSIGNED(x)
+      return not sdl.AUDIO_ISSIGNED(x)
+   end
+
+   function sdl.loadWAV(file, spec, audio_buf, audio_len)
+      return sdl.loadWAV_RW(sdl.RWFromFile(file, "rb"), 1, spec, audio_buf, audio_len)
+   end
+
+   -- surface
+   sdl.blitSurface = sdl.upperBlit
+
+   function sdl.MUSTLOCK(S)
+      return bit.band(S.flags, sdl.RLEACCEL)
+   end
+
+   function sdl.loadBMP(file)
+      return sdl.loadBMP_RW(sdl.RWFromFile(file, 'rb'), 1)
+   end
+
+   function sdl.saveBMP(surface, file)
+      return sdl.saveBMP_RW(surface, sdl.RWFromFile(file, 'wb'), 1)
+   end
+end
+
+return registerdefines