This is an initial (mostly working) port to SDL2.

By default SDL1.2 is still used, but by chaning the config.make
option, SDL2 is used instead as a build-time option.

What works, what doesn't?

Working fine:

Joystick input

Mouse input

Keyboard input

Sound

Fullscreen mode-switching - now working

Issues:

Fullscreen (native resolution) *mostly* (there is often some
flickering, switching back and forth fixes it. Needs
investigating.)  Okay, I think this is related to the problems
with the splash screen.  There's a problem with the GL bounds
I think.  I'm not an OpenGL expert by any means, so I'm not
sure what the problem is.

Splash screen - code is there and no longer prevents startup.
It works sometimes.  Usually the first time.  Always works
under wayland (with the Wayland SDL video backend), see below.

Windows support is untested.  I tried not to break it.

Wayland - I will test this shortly, it works, even the splash screen!
There were some issues resizing under Weston, lack of SSD makes it
tricky anyway!  Worked fine under Enlightenment/Wayland.

Android/iPhone, obscure devices ...  Probably needs OpenGL ES ...
maybe it just works like Wayland.

There is a lot of code that could be simplified, in particular
it's possible the SDL2 Windows support works...?

Testers/reviewers more than welcome!  Especially help with the
GL issues mentioned above.

GNUmakefile

@@ -1,9 +1,21 @@
 include $(GNUSTEP_MAKEFILES)/common.make
 include config.make
 
-vpath %.m src/SDL:src/Core:src/Core/Entities:src/Core/Materials:src/Core/Scripting:src/Core/OXPVerifier:src/Core/Debug
-vpath %.h src/SDL:src/Core:src/Core/Entities:src/Core/Materials:src/Core/Scripting:src/Core/OXPVerifier:src/Core/Debug:src/Core/MiniZip
-vpath %.c src/SDL:src/Core:src/BSDCompat:src/Core/Debug:src/Core/MiniZip
+ifeq ($(OO_SDL2_ENABLED),yes)
+	OO_SDL_DIR               = src/SDL2
+        SDL_CFLAGS               = `sdl2-config --cflags` -DOO_ENABLE_SDL2
+        SDL_OBJCFLAGS            = `sdl2-config --cflags` -DOO_ENABLE_SDL2
+        SDL_OBJC_LIBS     = -lSDL2main -lSDL2
+else
+	OO_SDL_DIR               = src/SDL
+        SDL_CFLAGS               = `sdl-config --cflags`
+        SDL_OBJCFLAGS            = `sdl-config --cflags`
+        SDL_OBJC_LIBS     = -lSDLmain -lSDL
+endif
+
+vpath %.m $(OO_SDL_DIR):src/Core:src/Core/Entities:src/Core/Materials:src/Core/Scripting:src/Core/OXPVerifier:src/Core/Debug
+vpath %.h $(OO_SDL_DIR):src/Core:src/Core/Entities:src/Core/Materials:src/Core/Scripting:src/Core/OXPVerifier:src/Core/Debug:src/Core/MiniZip
+vpath %.c $(OO_SDL_DIR):src/Core:src/BSDCompat:src/Core/Debug:src/Core/MiniZip
 GNUSTEP_INSTALLATION_DIR         = $(GNUSTEP_USER_ROOT)
 ifeq ($(GNUSTEP_HOST_OS),mingw32)
     GNUSTEP_OBJ_DIR_NAME         := $(GNUSTEP_OBJ_DIR_NAME).win
@@ -23,11 +35,11 @@ ifeq ($(GNUSTEP_HOST_OS),mingw32)
     else
         JS_IMPORT_LIBRARY        = js32ECMAv5
     endif
-    ADDITIONAL_INCLUDE_DIRS      = -I$(WIN_DEPS_DIR)/include -I$(JS_INC_DIR) -Isrc/SDL -Isrc/Core -Isrc/BSDCompat -Isrc/Core/Scripting -Isrc/Core/Materials -Isrc/Core/Entities -Isrc/Core/OXPVerifier -Isrc/Core/Debug -Isrc/Core/Tables -Isrc/Core/MiniZip
-    ADDITIONAL_OBJC_LIBS         = -lglu32 -lopengl32 -lopenal32.dll -lpng14.dll -lmingw32 -lSDLmain -lSDL -lvorbisfile.dll -lvorbis.dll -lz -lgnustep-base -l$(JS_IMPORT_LIBRARY) -lwinmm -mwindows
-    ADDITIONAL_CFLAGS            = -DWIN32 -DNEED_STRLCPY `sdl-config --cflags` -mtune=generic
+    ADDITIONAL_INCLUDE_DIRS      = -I$(WIN_DEPS_DIR)/include -I$(JS_INC_DIR) -I$(OO_SDL_DIR) -Isrc/Core -Isrc/BSDCompat -Isrc/Core/Scripting -Isrc/Core/Materials -Isrc/Core/Entities -Isrc/Core/OXPVerifier -Isrc/Core/Debug -Isrc/Core/Tables -Isrc/Core/MiniZip
+    ADDITIONAL_OBJC_LIBS         = -lglu32 -lopengl32 -lopenal32.dll -lpng14.dll -lmingw32 $(SDL_OBJC_LIBS) -lvorbisfile.dll -lvorbis.dll -lz -lgnustep-base -l$(JS_IMPORT_LIBRARY) -lwinmm -mwindows
+    ADDITIONAL_CFLAGS            = -DWIN32 -DNEED_STRLCPY $(SDL_CFLAGS) -mtune=generic
 # note the vpath stuff above isn't working for me, so adding src/SDL and src/Core explicitly
-    ADDITIONAL_OBJCFLAGS         = -DLOADSAVEGUI -DWIN32 -DXP_WIN -Wno-import -std=gnu99 `sdl-config --cflags` -mtune=generic
+    ADDITIONAL_OBJCFLAGS         = -DLOADSAVEGUI -DWIN32 -DXP_WIN -Wno-import -std=gnu99 $(SDL_OBJCFLAGS) -mtune=generic
     ifneq ($(GNUSTEP_HOST_CPU),x86_64)
         ADDITIONAL_LDFLAGS           += -Wl,--large-address-aware
     else
@@ -49,10 +61,10 @@ else
     LIBJS_LIB_DIR                = $(LIBJS_ROOT)/dist/lib
     LIBJS = js_static
 
-    ADDITIONAL_INCLUDE_DIRS      = -I$(LIBJS_INC_DIR) -Isrc/SDL -Isrc/Core -Isrc/BSDCompat -Isrc/Core/Scripting -Isrc/Core/Materials -Isrc/Core/Entities -Isrc/Core/OXPVerifier -Isrc/Core/Debug -Isrc/Core/Tables -Isrc/Core/MiniZip
-    ADDITIONAL_OBJC_LIBS         = -lGLU -lGL -lX11 -lSDL -lgnustep-base -l$(LIBJS) `nspr-config --libs` -lstdc++ -lopenal -lz -lvorbisfile
-    ADDITIONAL_CFLAGS            = -Wall -DLINUX -DNEED_STRLCPY `sdl-config --cflags` `nspr-config --cflags`
-    ADDITIONAL_OBJCFLAGS         = -Wall -std=gnu99 -DLOADSAVEGUI -DLINUX -DXP_UNIX -Wno-import `sdl-config --cflags` `nspr-config --cflags`
+    ADDITIONAL_INCLUDE_DIRS      = -I$(LIBJS_INC_DIR) -I$(OO_SDL_DIR) -Isrc/Core -Isrc/BSDCompat -Isrc/Core/Scripting -Isrc/Core/Materials -Isrc/Core/Entities -Isrc/Core/OXPVerifier -Isrc/Core/Debug -Isrc/Core/Tables -Isrc/Core/MiniZip
+    ADDITIONAL_OBJC_LIBS         = -lGLU -lGL -lX11 $(SDL_OBJC_LIBS) -lgnustep-base -l$(LIBJS) `nspr-config --libs` -lstdc++ -lopenal -lz -lvorbisfile
+    ADDITIONAL_CFLAGS            = -Wall -DLINUX -DNEED_STRLCPY $(SDL_CFLAGS) `nspr-config --cflags`
+    ADDITIONAL_OBJCFLAGS         = -Wall -std=gnu99 -DLOADSAVEGUI -DLINUX -DXP_UNIX -Wno-import $(SDL_OBJCFLAGS) `nspr-config --cflags`
     oolite_LIB_DIRS              += -L$(LIBJS_LIB_DIR) -L/usr/X11R6/lib/
 
     ifeq ($(use_deps),yes)

config.make

@@ -22,3 +22,4 @@ OO_LOCALIZATION_TOOLS          = yes
 DEBUG_GRAPHVIZ                 = yes
 OO_JAVASCRIPT_TRACE            = yes
 OO_FOV_INFLIGHT_CONTROL_ENABLED = no
+OO_SDL2_ENABLED = no

src/Core/OOJoystickManager.h

@@ -151,7 +151,6 @@ enum {
 //SDL Abstracted constants
 
 #if OOLITE_SDL
-
 #import <SDL.h>
 
 enum

src/Core/OOOpenGLOnly.h

@@ -57,6 +57,10 @@ MA 02110-1301, USA.
 // the standard SDL_opengl.h
 #include <SDL_opengl.h>
 
+#if OO_ENABLE_SDL2
+#include <GL/glu.h>
+#endif
+
 // include an up-to-date version of glext.h
 #include <GL/glext.h>
 

src/SDL2/MyOpenGLView.h

@@ -166,7 +166,8 @@ extern int debug;
 
 	// Windowed mode
 	NSSize				currentWindowSize;
-	SDL_Surface			*surface;
+	SDL_Window			*mainWindow;
+	SDL_GLContext			*glContext;
 
 	BOOL				showSplashScreen;
 
@@ -176,7 +177,7 @@ extern int debug;
 	BOOL				updateContext;
 	BOOL				saveSize;
 	unsigned			keyboardMap;
-	HWND 				SDL_Window;
+	HWND 				Main_Window;
 	MONITORINFOEX		monitorInfo;
 	RECT				lastGoodRect;