Add compiled version info for SDL2 libs.

src/SDL2.cs

@@ -368,6 +368,20 @@ namespace SDL2
 		
 		#region SDL_version.h, SDL_revision.h
 		
+		/* Similar to the headers, this is the version we're expecting to be
+		 * running with. You will likely want to check this somewhere in your
+		 * program!
+		 */
+		public const int SDL_MAJOR_VERSION =	2;
+		public const int SDL_MINOR_VERSION =	0;
+		public const int SDL_PATCHLEVEL =	0;
+		
+		public static readonly int SDL_COMPILEDVERSION = SDL_VERSIONNUM(
+			SDL_MAJOR_VERSION,
+			SDL_MINOR_VERSION,
+			SDL_PATCHLEVEL
+		);
+		
 		[StructLayout(LayoutKind.Sequential)]
 		public struct SDL_version
 		{
@@ -376,6 +390,23 @@ namespace SDL2
 			public byte patch;
 		}
 		
+		public static void SDL_VERSION(ref SDL_version x)
+		{
+			x.major = SDL_MAJOR_VERSION;
+			x.minor = SDL_MINOR_VERSION;
+			x.patch = SDL_PATCHLEVEL;
+		}
+		
+		public static int SDL_VERSIONNUM(int X, int Y, int Z)
+		{
+			return (X * 1000) + (Y * 100) + Z;
+		}
+		
+		public static bool SDL_VERSION_ATLEAST(int X, int Y, int Z)
+		{
+			return SDL_COMPILEDVERSION >= SDL_VERSIONNUM(X, Y, Z);
+		}
+		
 		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
 		private static extern void SDL_GetVersion(ref SDL_version ver);
 		

src/SDL2_image.cs

@@ -44,6 +44,14 @@ namespace SDL2
 		
 		#region SDL_image.h
 		
+		/* Similar to the headers, this is the version we're expecting to be
+		 * running with. You will likely want to check this somewhere in your
+		 * program!
+		 */
+		public const int SDL_IMAGE_MAJOR_VERSION =	2;
+		public const int SDL_IMAGE_MINOR_VERSION =	0;
+		public const int SDL_IMAGE_PATCHLEVEL =		0;
+		
 		[Flags]
 		public enum IMG_InitFlags
 		{
@@ -53,6 +61,13 @@ namespace SDL2
 			IMG_INIT_WEBP =	0x00000008
 		}
 		
+		public static void SDL_IMAGE_VERSION(ref SDL.SDL_version X)
+		{
+			X.major = SDL_IMAGE_MAJOR_VERSION;
+			X.minor = SDL_IMAGE_MINOR_VERSION;
+			X.patch = SDL_IMAGE_PATCHLEVEL;
+		}
+		
 		[DllImport(nativeLibName, EntryPoint = "IMG_LinkedVersion", CallingConvention = CallingConvention.Cdecl)]
 		private static extern IntPtr INTERNAL_IMG_LinkedVersion();
 		public static SDL.SDL_version IMG_LinkedVersion()

src/SDL2_mixer.cs

@@ -44,6 +44,14 @@ namespace SDL2
 		
 		#region SDL_mixer.h
 		
+		/* Similar to the headers, this is the version we're expecting to be
+		 * running with. You will likely want to check this somewhere in your
+		 * program!
+		 */
+		public const int SDL_MIXER_MAJOR_VERSION =	2;
+		public const int SDL_MIXER_MINOR_VERSION =	0;
+		public const int SDL_MIXER_PATCHLEVEL =		0;
+		
 		/* In C, you can redefine this value before including SDL_mixer.h.
 		 * We're not going to allow this in SDL2#, since the value of this
 		 * variable is persistent and not dependent on preprocessor ordering.
@@ -129,6 +137,13 @@ namespace SDL2
 			IntPtr b // void*
 		);
 		
+		public static void SDL_MIXER_VERSION(ref SDL.SDL_version X)
+		{
+			X.major = SDL_MIXER_MAJOR_VERSION;
+			X.minor = SDL_MIXER_MINOR_VERSION;
+			X.patch = SDL_MIXER_PATCHLEVEL;
+		}
+		
 		[DllImport(nativeLibName, EntryPoint = "MIX_Linked_Version", CallingConvention = CallingConvention.Cdecl)]
 		private static extern IntPtr INTERNAL_MIX_Linked_Version();
 		public static SDL.SDL_version MIX_Linked_Version()

src/SDL2_ttf.cs

@@ -44,6 +44,14 @@ namespace SDL2
 		
 		#region SDL_ttf.h
 		
+		/* Similar to the headers, this is the version we're expecting to be
+		 * running with. You will likely want to check this somewhere in your
+		 * program!
+		 */
+		public const int SDL_TTF_MAJOR_VERSION =	2;
+		public const int SDL_TTF_MINOR_VERSION =	2;
+		public const int SDL_TTF_PATCHLEVEL =		12;
+		
 		public const int UNICODE_BOM_NATIVE =	0xFEFF;
 		public const int UNICODE_BOM_SWAPPED =	0xFFFE;
 		
@@ -58,6 +66,13 @@ namespace SDL2
 		public const int TTF_HINTING_MONO =	2;
 		public const int TTF_HINTING_NONE =	3;
 		
+		public static void SDL_TTF_VERSION(ref SDL.SDL_version X)
+		{
+			X.major = SDL_TTF_MAJOR_VERSION;
+			X.minor = SDL_TTF_MINOR_VERSION;
+			X.patch = SDL_TTF_PATCHLEVEL;
+		}
+		
 		[DllImport(nativeLibName, EntryPoint = "TTF_LinkedVersion", CallingConvention = CallingConvention.Cdecl)]
 		private static extern IntPtr INTERNAL_TTF_LinkedVersion();
 		public static SDL.SDL_version TTF_LinkedVersion()