add dedicated backend (WIP)

luigi/backend/ffisdl/sdl2/defines.lua

@@ -0,0 +1,58 @@
+-- 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