move SDL sources to their own folder

CMakeLists.txt

@@ -27,7 +27,6 @@ set(srcs
 	source/bgmusic.c
 	source/bgmusic.h
 	source/bspfile.h
-	source/cd_sdl.c
 	source/cdaudio.h
 	source/cfgfile.c
 	source/cfgfile.h
@@ -63,7 +62,6 @@ set(srcs
 	source/gl_sky.c
 	source/gl_texmgr.c
 	source/gl_texmgr.h
-	source/gl_vidsdl.c
 	source/gl_warp.c
 	source/gl_warp_sin.h
 	source/glquake.h
@@ -71,12 +69,10 @@ set(srcs
 	source/host_cmd.c
 	source/image.c
 	source/image.h
-	source/in_sdl.c
 	source/input.h
 	source/keys.c
 	source/keys.h
 	source/lodepng.h
-	source/main_sdl.c
 	source/mathlib.c
 	source/mathlib.h
 	source/menu.c
@@ -129,7 +125,6 @@ set(srcs
 	source/snd_mpg123.c
 	source/snd_opus.c
 	source/snd_opus.h
-	source/snd_sdl.c
 	source/snd_umx.c
 	source/snd_umx.h
 	source/snd_vorbis.c
@@ -178,6 +173,15 @@ set(srcs_windows
 	source/windows/sys_sdl_win.c
 	source/windows/wsaerror.h)
 
+set(srcs_sdl
+	source/sdl/cd_sdl.c
+	source/sdl/gl_vidsdl.c
+	source/sdl/in_sdl.c
+	source/sdl/main_sdl.c
+	source/sdl/snd_sdl.c)
+
+list(APPEND srcs ${srcs_sdl})
+
 if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
 	list(APPEND srcs ${srcs_windows})
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")

source/sdl/endian_sdl.h

@@ -0,0 +1,36 @@
+/*
+Copyright (C) 2019 Alison G. Watson
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#ifndef spingle__endian_sdl_h
+#define spingle__endian_sdl_h
+
+#include <SDL_endian.h>
+
+#define HOST_BIGENDIAN (SDL_BYTEORDER == SDL_BIG_ENDIAN)
+
+#define BigShort SDL_SwapBE16
+#define BigLong  SDL_SwapBE32
+#define BigFloat SDL_SwapFloatBE
+
+#define LittleShort SDL_SwapLE16
+#define LittleLong  SDL_SwapLE32
+#define LittleFloat SDL_SwapFloatLE
+
+#endif