WhatsNew
author Sam Lantinga <slouken@libsdl.org>
Mon, 16 Sep 2002 07:09:04 +0000
changeset 496 864a66f028d8
parent 451 24edec3cafe4
child 648 12a21d82a060
permissions -rw-r--r--
Don't be fooled by unclutter - the mouse isn't really leaving our window
     1 
     2 This is a list of API changes in SDL's version history.
     3 
     4 Version 1.0:
     5 
     6 1.2.5:
     7 	Added SDL_BUTTON_WHEELUP (4) and SDL_BUTTON_WHEELDOWN (5)
     8 
     9 	Added SDL_GL_STEREO for stereoscopic OpenGL contexts
    10 
    11 1.2.0:
    12 	Added SDL_VIDEOEXPOSE event to signal that the screen needs to
    13 	be redrawn.  This is currently only delivered to OpenGL windows
    14 	on X11, though it may be delivered in the future when the video
    15 	memory is lost under DirectX.
    16 
    17 1.1.8:
    18 	You can pass SDL_NOFRAME to SDL_VideoMode() to create a window
    19 	that has no title bar or frame decoration.  Fullscreen video
    20 	modes automatically have this flag set.
    21 
    22 	Added a function to query the clipping rectangle for a surface:
    23 		void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
    24 
    25 	Added a function to query the current event filter:
    26 		SDL_EventFilter SDL_GetEventFilter(void)
    27 
    28 	If you pass -1 to SDL_ShowCursor(), it won't change the current
    29 	cursor visibility state, but will still return it.
    30 
    31 	SDL_LockSurface() and SDL_UnlockSurface() are recursive, meaning
    32 	you can nest them as deep as you want, as long as each lock call
    33 	has a matching unlock call.  The surface remains locked until the
    34 	last matching unlock call.
    35 
    36 	Note that you may not blit to or from a locked surface.
    37 
    38 1.1.7:
    39 	The SDL_SetGammaRamp() and SDL_GetGammaRamp() functions now take
    40 	arrays of Uint16 values instead of Uint8 values.  For the most part,
    41 	you can just take your old values and shift them up 8 bits to get
    42 	new correct values for your gamma ramps.
    43 
    44 	You can pass SDL_RLEACCEL in flags passed to SDL_ConvertSurface()
    45         and SDL will try to RLE accelerate colorkey and alpha blits in the
    46 	resulting surface.
    47 
    48 1.1.6:
    49 	Added a function to return the thread ID of a specific thread:
    50 		Uint32 SDL_GetThreadID(SDL_Thread *thread)
    51 	If 'thread' is NULL, this function returns the id for this thread.
    52 
    53 1.1.5:
    54 	The YUV overlay structure has been changed to use an array of
    55 	pitches and pixels representing the planes of a YUV image, to
    56 	better enable hardware acceleration.  The YV12 and IYUV formats
    57 	each have three planes, corresponding to the Y, U, and V portions
    58 	of the image, while packed pixel YUV formats just have one plane.
    59 
    60 	For palettized mode (8bpp), the screen colormap is now split in
    61 	a physical and a logical palette. The physical palette determines
    62 	what colours the screen pixels will get when displayed, and the
    63 	logical palette controls the mapping from blits to/from the screen.
    64 	A new function, SDL_SetPalette() has been added to change
    65 	logical and physical palettes separately. SDL_SetColors() works
    66 	just as before, and is equivalent to calling SDL_SetPalette() with
    67 	a flag argument of (SDL_LOGPAL|SDL_PHYSPAL).
    68 
    69 	SDL_BlitSurface() no longer modifies the source rectangle, only the
    70 	destination rectangle. The width/height members of the destination
    71 	rectangle are ignored, only the position is used.
    72 
    73 	The old source clipping function SDL_SetClipping() has been replaced
    74 	with a more useful function to set the destination clipping rectangle:
    75 		SDL_bool SDL_SetClipRect(SDL_Surface *surface, SDL_Rect *rect)
    76 		
    77 	Added a function to see what subsystems have been initialized:
    78 		Uint32 SDL_WasInit(Uint32 flags)
    79 
    80 	The Big Alpha Flip: SDL now treats alpha as opacity like everybody
    81 	else, and not as transparency:
    82 
    83 	A new cpp symbol: SDL_ALPHA_OPAQUE is defined as 255
    84 	A new cpp symbol: SDL_ALPHA_TRANSPARENT is defined as 0
    85 	Values between 0 and 255 vary from fully transparent to fully opaque.
    86 
    87 	New functions:
    88 	SDL_DisplayFormatAlpha()
    89 	    Returns a surface converted to a format with alpha-channel
    90 	    that can be blit efficiently to the screen. (In other words,
    91 	    like SDL_DisplayFormat() but the resulting surface has
    92 	    an alpha channel.)  This is useful for surfaces with alpha.
    93 	SDL_MapRGBA()
    94 	    Works as SDL_MapRGB() but takes an additional alpha parameter.
    95 	SDL_GetRGBA()
    96 	    Works as SDL_GetRGB() but also returns the alpha value
    97 	    (SDL_ALPHA_OPAQUE for formats without an alpha channel)
    98 
    99 	Both SDL_GetRGB() and SDL_GetRGBA() now always return values in
   100 	the [0..255] interval. Previously, SDL_GetRGB() would return
   101 	(0xf8, 0xfc, 0xf8) for a completely white pixel in RGB565 format.
   102 	(N.B.: This is broken for bit fields < 3 bits.)
   103 
   104 	SDL_MapRGB() returns pixels in which the alpha channel is set opaque.
   105 
   106 	SDL_SetAlpha() can now be used for both setting the per-surface
   107 	alpha, using the new way of thinking of alpha, and also to enable
   108 	and disable per-pixel alpha blending for surfaces with an alpha
   109 	channel:
   110 		To disable alpha blending:
   111 			SDL_SetAlpha(surface, 0, 0);
   112 		To re-enable alpha blending:
   113 			SDL_SetAlpha(surface, SDL_SRCALPHA, 0);
   114 	Surfaces with an alpha channel have blending enabled by default.
   115 
   116 	SDL_SetAlpha() now accepts SDL_RLEACCEL as a flag, which requests
   117 	RLE acceleration of blits, just as like with SDL_SetColorKey().
   118 	This flag can be set for both surfaces with an alpha channel
   119 	and surfaces with an alpha value set by SDL_SetAlpha().
   120 	As always, RLE surfaces must be locked before pixel access is
   121 	allowed, and unlocked before any other SDL operations are done
   122 	on it.
   123 
   124 	The blit semantics for surfaces with and without alpha and colorkey
   125 	have now been defined:
   126 
   127 	RGBA->RGB:
   128 	    SDL_SRCALPHA set:
   129 		alpha-blend (using alpha-channel).
   130 		SDL_SRCCOLORKEY ignored.
   131 	    SDL_SRCALPHA not set:
   132 		copy RGB.
   133 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   134 		RGB values of the source colour key, ignoring alpha in the
   135 		comparison.
   136 
   137 	RGB->RGBA:
   138 	    SDL_SRCALPHA set:
   139 		alpha-blend (using the source per-surface alpha value);
   140 		set destination alpha to opaque.
   141 	    SDL_SRCALPHA not set:
   142 		copy RGB, set destination alpha to opaque.
   143 	    both:
   144 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   145 		source colour key.
   146 
   147 	RGBA->RGBA:
   148 	    SDL_SRCALPHA set:
   149 		alpha-blend (using the source alpha channel) the RGB values;
   150 		leave destination alpha untouched. [Note: is this correct?]
   151 		SDL_SRCCOLORKEY ignored.
   152 	    SDL_SRCALPHA not set:
   153 		copy all of RGBA to the destination.
   154 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   155 		RGB values of the source colour key, ignoring alpha in the
   156 		comparison.
   157 
   158 	RGB->RGB: 
   159 	    SDL_SRCALPHA set:
   160 		alpha-blend (using the source per-surface alpha value).
   161 	    SDL_SRCALPHA not set:
   162 		copy RGB.
   163 	    both:
   164 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   165 		source colour key.
   166 
   167 	As a special case, blits from surfaces with per-surface alpha
   168 	value of 128 (50% transparency) are optimised and much faster
   169 	than other alpha values. This does not apply to surfaces with
   170 	alpha channels (per-pixel alpha).
   171 
   172 	New functions for manipulating the gamma of the display have
   173 	been added:
   174 		int SDL_SetGamma(float red, float green, float blue);
   175 		int SDL_SetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
   176 		int SDL_GetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
   177 	Gamma ramps are tables with 256 entries which map the screen color
   178 	components into actually displayed colors.  For an example of
   179 	implementing gamma correction and gamma fades, see test/testgamma.c
   180 	Gamma control is not supported on all hardware.
   181 
   182 1.1.4:
   183 	The size of the SDL_CDtrack structure changed from 8 to 12 bytes
   184 	as the size of the length member was extended to 32 bits.
   185 
   186         You can now use SDL for 2D blitting with a GL mode by passing the
   187 	SDL_OPENGLBLIT flag to SDL_SetVideoMode().  You can specify 16 or
   188 	32 bpp, and the data in the framebuffer is put into the GL scene
   189 	when you call SDL_UpdateRects(), and the scene will be visible
   190 	when you call SDL_GL_SwapBuffers().
   191 
   192 	Run the "testgl" test program with the -logo command line option
   193 	to see an example of this blending of 2D and 3D in SDL.
   194 
   195 1.1.3:
   196 	Added SDL_FreeRW() to the API, to complement SDL_AllocRW()
   197 
   198 	Added resizable window support - just add SDL_RESIZABLE to the
   199 	SDL_SetVideoMode() flags, and then wait for SDL_VIDEORESIZE events.
   200 	See SDL_events.h for details on the new SDL_ResizeEvent structure.
   201 
   202 	Added condition variable support, based on mutexes and semaphores.
   203 		SDL_CreateCond()
   204 		SDL_DestroyCond()
   205 		SDL_CondSignal()
   206 		SDL_CondBroadcast()
   207 		SDL_CondWait()
   208 		SDL_CondTimedWait()
   209 	The new function prototypes are in SDL_mutex.h
   210 
   211 	Added counting semaphore support, based on the mutex primitive.
   212 		SDL_CreateSemaphore()
   213 		SDL_DestroySemaphore()
   214 		SDL_SemWait()
   215 		SDL_SemTryWait()
   216 		SDL_SemWaitTimeout()
   217 		SDL_SemPost()
   218 		SDL_SemValue()
   219 	The new function prototypes are in SDL_mutex.h
   220 
   221 	Added support for asynchronous blitting.  To take advantage of this,
   222 	you must set the SDL_ASYNCBLIT flag when setting the video mode and
   223 	creating surfaces that you want accelerated in this way.  You must
   224 	lock surfaces that have this flag set, and the lock will block until
   225 	any queued blits have completed.
   226 
   227 	Added YUV video overlay support.
   228 	The supported YUV formats are: YV12, IYUV, YUY2, UYVY, and YVYU.
   229 	This function creates an overlay surface:
   230 		SDL_CreateYUVOverlay()
   231 	You must lock and unlock the overlay to get access to the data:
   232 		SDL_LockYUVOverlay() SDL_UnlockYUVOverlay()
   233 	You can then display the overlay:
   234 		SDL_DisplayYUVOverlay()
   235 	You must free the overlay when you are done using it:
   236 		SDL_FreeYUVOverlay()
   237 	See SDL_video.h for the full function prototypes.
   238 
   239 	The joystick hat position constants have been changed:
   240 	Old constant            New constant
   241 	------------            ------------
   242 	     0                  SDL_HAT_CENTERED
   243 	     1                  SDL_HAT_UP
   244 	     2                  SDL_HAT_RIGHTUP
   245 	     3                  SDL_HAT_RIGHT
   246 	     4                  SDL_HAT_RIGHTDOWN
   247 	     5                  SDL_HAT_DOWN
   248 	     6                  SDL_HAT_LEFTDOWN
   249 	     7                  SDL_HAT_LEFT
   250 	     8                  SDL_HAT_LEFTUP
   251 	The new constants are bitmasks, so you can check for the
   252 	individual axes like this:
   253 		if ( hat_position & SDL_HAT_UP ) {
   254 		}
   255 	and you'll catch left-up, up, and right-up.
   256 
   257 1.1.2:
   258 	Added multiple timer support:
   259 		SDL_AddTimer() and SDL_RemoveTimer()
   260 
   261 	SDL_WM_SetIcon() now respects the icon colorkey if mask is NULL.
   262 
   263 1.1.0:
   264 	Added initial OpenGL support.
   265 	First set GL attributes (such as RGB depth, alpha depth, etc.)
   266 		SDL_GL_SetAttribute()
   267 	Then call SDL_SetVideoMode() with the SDL_OPENGL flag.
   268 	Perform all of your normal GL drawing.
   269 	Finally swap the buffers with the new SDL function:
   270 		SDL_GL_SwapBuffers()
   271 	See the new 'testgl' test program for an example of using GL with SDL.
   272 
   273 	You can load GL extension functions by using the function:
   274 		SDL_GL_LoadProcAddress()
   275 
   276 	Added functions to initialize and cleanup specific SDL subsystems:
   277 		SDL_InitSubSystem() and SDL_QuitSubSystem()
   278 
   279 	Added user-defined event type:
   280 		typedef struct {
   281         		Uint8 type;
   282         		int code;
   283         		void *data1;
   284         		void *data2;
   285 		} SDL_UserEvent;
   286 	This structure is in the "user" member of an SDL_Event.
   287 
   288 	Added a function to push events into the event queue:
   289 		SDL_PushEvent()
   290 
   291 	Example of using the new SDL user-defined events:
   292 	{
   293 		SDL_Event event;
   294 
   295 		event.type = SDL_USEREVENT;
   296 		event.user.code = my_event_code;
   297 		event.user.data1 = significant_data;
   298 		event.user.data2 = 0;
   299 		SDL_PushEvent(&event);
   300 	}
   301 
   302 	Added a function to get mouse deltas since last query:
   303 		SDL_GetRelativeMouseState()
   304 
   305 	Added a boolean datatype to SDL_types.h:
   306 		SDL_bool = { SDL_TRUE, SDL_FALSE }
   307 
   308 	Added a function to get the current audio status:
   309 		SDL_GetAudioState();
   310 	It returns one of:
   311 		SDL_AUDIO_STOPPED,
   312 		SDL_AUDIO_PLAYING,
   313 		SDL_AUDIO_PAUSED
   314 
   315 	Added an AAlib driver (ASCII Art) - by Stephane Peter.
   316 
   317 1.0.6:
   318 	The input grab state is reset after each call to SDL_SetVideoMode().
   319 	The input is grabbed by default in fullscreen mode, and ungrabbed in
   320 	windowed mode.  If you want to set input grab to a particular value,
   321 	you should set it after each call to SDL_SetVideoMode().
   322 
   323 1.0.5:
   324 	Exposed SDL_AudioInit(), SDL_VideoInit()
   325 	Added SDL_AudioDriverName() and SDL_VideoDriverName()
   326 
   327 	Added new window manager function:
   328 		SDL_WM_ToggleFullScreen()
   329 	This is currently implemented only on Linux
   330 
   331 	The ALT-ENTER code has been removed - it's not appropriate for a
   332 	lib to bind keys when they aren't even emergency escape sequences.
   333 
   334 	ALT-ENTER functionality can be implemented with the following code:
   335 
   336 	int Handle_AltEnter(const SDL_Event *event)
   337 	{
   338 	    if ( event->type == SDL_KEYDOWN ) {
   339 	        if ( (event->key.keysym.sym == SDLK_RETURN) &&
   340 	             (event->key.keysym.mod & KMOD_ALT) ) {   
   341 	                SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());
   342 	                return(0);
   343 	        }
   344 	    }
   345 	    return(1);
   346 	}
   347 	SDL_SetEventFilter(Handle_AltEnter);
   348 
   349 1.0.3:
   350 	Under X11, if you grab the input and hide the mouse cursor,
   351 	the mouse will go into a "relative motion" mode where you
   352 	will always get relative motion events no matter how far in
   353 	each direction you move the mouse - relative motion is not
   354 	bounded by the edges of the window (though the absolute values
   355 	of the mouse positions are clamped by the size of the window).
   356 	The SVGAlib, framebuffer console, and DirectInput drivers all
   357 	have this behavior naturally, and the GDI and BWindow drivers
   358 	never go into "relative motion" mode.
   359 
   360 1.0.2:
   361 	Added a function to enable keyboard repeat:
   362 		SDL_EnableKeyRepeat()
   363 
   364 	Added a function to grab the mouse and keyboard input
   365 		SDL_WM_GrabInput()
   366 
   367 	Added a function to iconify the window.
   368 		SDL_WM_IconifyWindow()
   369 	If this function succeeds, the application will receive an event
   370 	signaling SDL_APPACTIVE event 
   371 
   372 1.0.1:
   373 	Added constants to SDL_audio.h for 16-bit native byte ordering:
   374 		AUDIO_U16SYS, AUDIO_S16SYS
   375 
   376 1.0.0:
   377 	New public release
   378 
   379 Version 0.11:
   380 
   381 0.11.5:
   382 	A new function SDL_GetVideoSurface() has been added, and returns
   383 	a pointer to the current display surface.
   384 
   385 	SDL_AllocSurface() has been renamed SDL_CreateRGBSurface(), and
   386 	a new function SDL_CreateRGBSurfaceFrom() has been added to allow
   387 	creating an SDL surface from an existing pixel data buffer.
   388 
   389 	Added SDL_GetRGB() to the headers and documentation.
   390 
   391 0.11.4:
   392 	SDL_SetLibraryPath() is no longer meaningful, and has been removed.
   393 
   394 0.11.3:
   395 	A new flag for SDL_Init(), SDL_INIT_NOPARACHUTE, prevents SDL from
   396 	installing fatal signal handlers on operating systems that support
   397 	them.
   398 
   399 Version 0.9:
   400 
   401 0.9.15:
   402 	SDL_CreateColorCursor() has been removed.  Color cursors should
   403 	be implemented as sprites, blitted by the application when the
   404 	cursor moves.  To get smooth color cursor updates when the app
   405 	is busy, pass the SDL_INIT_EVENTTHREAD flag to SDL_Init().  This
   406 	allows you to handle the mouse motion in another thread from an
   407 	event filter function, but is currently only supported by Linux
   408 	and BeOS.  Note that you'll have to protect the display surface
   409 	from multi-threaded access by using mutexes if you do this.
   410 
   411 	Thread-safe surface support has been removed from SDL.
   412 	This makes blitting somewhat faster, by removing SDL_MiddleBlit().
   413 	Code that used SDL_MiddleBlit() should use SDL_LowerBlit() instead.
   414 	You can make your surfaces thread-safe by allocating your own
   415 	mutex and making lock/unlock calls around accesses to your surface.
   416 
   417 0.9.14:
   418 	SDL_GetMouseState() now takes pointers to int rather than Uint16.
   419 
   420 	If you set the SDL_WINDOWID environment variable under UNIX X11,
   421 	SDL will use that as the main window instead of creating it's own.
   422 	This is an unsupported extension to SDL, and not portable at all.
   423 
   424 0.9.13:
   425 	Added a function SDL_SetLibraryPath() which can be used to specify
   426 	the directory containing the SDL dynamic libraries.  This is useful
   427 	for commercial applications which ship with particular versions
   428 	of the libraries, and for security on multi-user systems.
   429 	If this function is not used, the default system directories are 
   430 	searched using the native dynamic object loading mechanism.
   431 
   432 	In order to support C linkage under Visual C++, you must declare
   433 	main() without any return type:
   434 		main(int argc, char *argv[]) {
   435 			/* Do the program... */
   436 			return(0);
   437 		}
   438 	C++ programs should also return a value if compiled under VC++.
   439 
   440 	The blit_endian member of the SDL_VideoInfo struct has been removed.
   441 
   442 	SDL_SymToASCII() has been replaced with SDL_GetKeyName(), so there
   443 	is now no longer any function to translate a keysym to a character.
   444 
   445 	The SDL_keysym structure has been extended with a 'scancode' and
   446 	'unicode' member.  The 'scancode' is a hardware specific scancode
   447 	for the key that was pressed, and may be 0.  The 'unicode' member
   448 	is a 16-bit UNICODE translation of the key that was pressed along
   449 	with any modifiers or compose keys that have been pressed.
   450 	If no UNICODE translation exists for the key, 'unicode' will be 0.
   451 
   452 	Added a function SDL_EnableUNICODE() to enable/disable UNICODE
   453 	translation of character keypresses.  Translation defaults off.
   454 
   455 	To convert existing code to use the new API, change code which
   456 	uses SDL_SymToASCII() to get the keyname to use SDL_GetKeyName(),
   457 	and change code which uses it to get the ASCII value of a sym to
   458 	use the 'unicode' member of the event keysym.
   459 
   460 0.9.12:
   461 	There is partial support for 64-bit datatypes.  I don't recommend 
   462 	you use this if you have a choice, because 64-bit datatypes are not
   463 	supported on many platforms.  On platforms for which it is supported,
   464 	the SDL_HAS_64BIT_TYPE C preprocessor define will be enabled, and
   465 	you can use the Uint64 and Sint64 datatypes.
   466 
   467 	Added functions to SDL_endian.h to support 64-bit datatypes:
   468 	    SDL_SwapLE64(), SDL_SwapBE64(),
   469 	    SDL_ReadLE64(), SDL_ReadBE64(), SDL_WriteLE64(), SDL_WriteBE64()
   470 
   471 	A new member "len_ratio" has been added to the SDL_AudioCVT structure,
   472 	and allows you to determine either the original buffer length or the
   473 	converted buffer length, given the other.
   474 
   475 	A new function SDL_FreeWAV() has been added to the API to free data
   476 	allocated by SDL_LoadWAV_RW().  This is necessary under Win32 since
   477 	the gcc compiled DLL uses a different heap than VC++ compiled apps.
   478 
   479 	SDL now has initial support for international keyboards using the
   480 	Latin character set.
   481 	If a particular mapping is desired, you can set the DEFAULT_KEYBOARD
   482 	compile-time variable, or you can set the environment variable 
   483 	"SDL_KEYBOARD" to a string identifying the keyboard mapping you desire.
   484 	The valid values for these variables can be found in SDL_keyboard.c
   485 
   486 	Full support for German and French keyboards under X11 is implemented.
   487 
   488 0.9.11:
   489 	The THREADED_EVENTS compile-time define has been replaced with the
   490 	SDL_INIT_EVENTTHREAD flag.  If this flag is passed to SDL_Init(),
   491 	SDL will create a separate thread to perform input event handling.
   492 	If this flag is passed to SDL_Init(), and the OS doesn't support 
   493 	event handling in a separate thread, SDL_Init() will fail.
   494 	Be sure to add calls to SDL_Delay() in your main thread to allow
   495 	the OS to schedule your event thread, or it may starve, leading
   496 	to slow event delivery and/or dropped events.
   497 	Currently MacOS and Win32 do not support this flag, while BeOS 
   498 	and Linux do support it.  I recommend that your application only
   499 	use this flag if absolutely necessary.
   500 
   501 	The SDL thread function passed to SDL_CreateThread() now returns a
   502 	status.  This status can be retrieved by passing a non-NULL pointer
   503 	as the 'status' argument to SDL_WaitThread().
   504 
   505 	The volume parameter to SDL_MixAudio() has been increased in range
   506 	from (0-8) to (0-128)
   507 
   508 	SDL now has a data source abstraction which can encompass a file,
   509 	an area of memory, or any custom object you can envision.  It uses
   510 	these abstractions, SDL_RWops, in the endian read/write functions,
   511 	and the built-in WAV and BMP file loaders.  This means you can load
   512 	WAV chunks from memory mapped files, compressed archives, network
   513 	pipes, or anything else that has a data read abstraction.
   514 
   515 	There are three built-in data source abstractions:
   516 	    SDL_RWFromFile(), SDL_RWFromFP(), SDL_RWFromMem()
   517 	along with a generic data source allocation function:
   518 	    SDL_AllocRW()
   519 	These data sources can be used like stdio file pointers with the
   520 	following convenience functions:
   521 	    SDL_RWseek(), SDL_RWread(), SDL_RWwrite(), SDL_RWclose()
   522 	These functions are defined in the new header file "SDL_rwops.h"
   523 
   524 	The endian swapping functions have been turned into macros for speed
   525 	and SDL_CalculateEndian() has been removed.  SDL_endian.h now defines
   526 	SDL_BYTEORDER as either SDL_BIG_ENDIAN or SDL_LIL_ENDIAN depending on
   527 	the endianness of the host system.
   528 
   529 	The endian read/write functions now take an SDL_RWops pointer
   530 	instead of a stdio FILE pointer, to support the new data source
   531 	abstraction.
   532 
   533 	The SDL_*LoadWAV() functions have been replaced with a single
   534 	SDL_LoadWAV_RW() function that takes a SDL_RWops pointer as it's
   535 	first parameter, and a flag whether or not to automatically 
   536 	free it as the second parameter.  SDL_LoadWAV() is a macro for
   537 	backward compatibility and convenience:
   538 	    SDL_LoadWAV_RW(SDL_RWFromFile("sample.wav", "rb"), 1, ...);
   539 
   540 	The SDL_*LoadBMP()/SDL_*SaveBMP() functions have each been replaced
   541 	with a single function that takes a SDL_RWops pointer as it's
   542 	first parameter, and a flag whether or not to automatically 
   543 	free it as the second parameter.  SDL_LoadBMP() and SDL_SaveBMP()
   544 	are macros for backward compatibility and convenience:
   545 	    SDL_LoadBMP_RW(SDL_RWFromFile("sample.bmp", "rb"), 1, ...);
   546 	    SDL_SaveBMP_RW(SDL_RWFromFile("sample.bmp", "wb"), 1, ...);
   547 	Note that these functions use SDL_RWseek() extensively, and should
   548 	not be used on pipes or other non-seekable data sources.
   549 
   550 0.9.10:
   551 	The Linux SDL_SysWMInfo and SDL_SysWMMsg structures have been 
   552 	extended to support multiple types of display drivers, as well as
   553         safe access to the X11 display when THREADED_EVENTS is enabled.
   554         The new structures are documented in the SDL_syswm.h header file.
   555 
   556 	Thanks to John Elliott <jce@seasip.demon.co.uk>, the UK keyboard
   557 	should now work properly, as well as the "Windows" keys on US
   558 	keyboards.
   559 
   560 	The Linux CD-ROM code now reads the CD-ROM devices from /etc/fstab
   561 	instead of trying to open each block device on the system.
   562 	The CD must be listed in /etc/fstab as using the iso9660 filesystem.
   563 
   564 	On Linux, if you define THREADED_EVENTS at compile time, a separate
   565 	thread will be spawned to gather X events asynchronously from the
   566 	graphics updates.  This hasn't been extensively tested, but it does
   567 	provide a means of handling keyboard and mouse input in a separate
   568 	thread from the graphics thread.  (This is now enabled by default.)
   569 
   570 	A special access function SDL_PeepEvents() allows you to manipulate
   571 	the event queue in a thread-safe manner, including peeking at events,
   572 	removing events of a specified type, and adding new events of arbitrary
   573 	type to the queue (use the new 'user' member of the SDL_Event type).
   574 
   575 	If you use SDL_PeepEvents() to gather events, then the main graphics
   576 	thread needs to call SDL_PumpEvents() periodically to drive the event
   577 	loop and generate input events.  This is not necessary if SDL has been 
   578 	compiled with THREADED_EVENTS defined, but doesn't hurt.
   579 
   580 	A new function SDL_ThreadID() returns the identifier associated with
   581 	the current thread.
   582 
   583 0.9.9:
   584 	The AUDIO_STEREO format flag has been replaced with a new 'channels'
   585 	member of the SDL_AudioSpec structure.  The channels are 1 for mono
   586 	audio, and 2 for stereo audio.  In the future more channels may be
   587 	supported for 3D surround sound.
   588 
   589 	The SDL_MixAudio() function now takes an additional volume parameter,
   590 	which should be set to SDL_MIX_MAXVOLUME for compatibility with the
   591 	original function.
   592 
   593 	The CD-ROM functions which take a 'cdrom' parameter can now be
   594 	passed NULL, and will act on the last successfully opened CD-ROM.
   595 
   596 0.9.8:
   597 	No changes, bugfixes only.
   598 	
   599 0.9.7:
   600 	No changes, bugfixes only.
   601 	
   602 0.9.6:
   603 	Added a fast rectangle fill function: SDL_FillRect()
   604 
   605 	Addition of a useful function for getting info on the video hardware:
   606 	    const SDL_VideoInfo *SDL_GetVideoInfo(void)
   607         This function replaces SDL_GetDisplayFormat().
   608 
   609 	Initial support for double-buffering:
   610 	  Use the SDL_DOUBLEBUF flag in SDL_SetVideoMode()
   611 	  Update the screen with a new function: SDL_Flip()
   612 
   613 	SDL_AllocSurface() takes two new flags:
   614 	SDL_SRCCOLORKEY means that the surface will be used for colorkey blits
   615 	  and if the hardware supports hardware acceleration of colorkey blits
   616 	  between two surfaces in video memory, to place the surface in video
   617 	  memory if possible, otherwise it will be placed in system memory.
   618 	SDL_SRCALPHA means that the surface will be used for alpha blits and
   619 	  if the hardware supports hardware acceleration of alpha blits between
   620 	  two surfaces in video memory, to place the surface in video memory
   621 	  if possible, otherwise it will be placed in system memory.
   622 	SDL_HWSURFACE now means that the surface will be created with the 
   623 	  same format as the display surface, since having surfaces in video
   624 	  memory is only useful for fast blitting to the screen, and you can't
   625 	  blit surfaces with different surface formats in video memory.
   626 
   627 0.9.5:
   628 	You can now pass a NULL mask to SDL_WM_SetIcon(), and it will assume
   629 	that the icon consists of the entire image.
   630 
   631 	SDL_LowerBlit() is back -- but don't use it on the display surface.
   632 	It is exactly the same as SDL_MiddleBlit(), but doesn't check for
   633 	thread safety.
   634 
   635 	Added SDL_FPLoadBMP(), SDL_FPSaveBMP(), SDL_FPLoadWAV(), which take
   636 	a FILE pointer instead of a file name.
   637 
   638 	Added CD-ROM audio control API:
   639 	    SDL_CDNumDrives()
   640 	    SDL_CDName()
   641 	    SDL_CDOpen()
   642 	    SDL_CDStatus()
   643 	    SDL_CDPlayTracks()
   644 	    SDL_CDPlay()
   645 	    SDL_CDPause()
   646 	    SDL_CDResume()
   647 	    SDL_CDStop()
   648 	    SDL_CDEject()
   649 	    SDL_CDClose()
   650 
   651 0.9.4:
   652 	No changes, bugfixes only.
   653 
   654 0.9.3:
   655 	Mouse motion event now includes relative motion information:
   656 	    Sint16 event->motion.xrel, Sint16 event->motion.yrel
   657 
   658 	X11 keyrepeat handling can be disabled by defining IGNORE_X_KEYREPEAT
   659 	    (Add -DIGNORE_X_KEYREPEAT to CFLAGS line in obj/x11Makefile)
   660 
   661 0.9.2:
   662 	No changes, bugfixes only.
   663 
   664 0.9.1:
   665 	Removed SDL_MapSurface() and SDL_UnmapSurface() -- surfaces are now
   666 	automatically mapped on blit.
   667 
   668 0.8.0:
   669 	SDL stable release