WhatsNew
author Ozkan Sezer <sezeroz@gmail.com>
Thu, 15 Aug 2019 16:55:56 +0300
branchSDL-1.2
changeset 13009 12a87fcb4d97
parent 12993 e7ee29d04712
child 13051 08ae4fcfa2e3
permissions -rw-r--r--
fix / update changelog entries.
     1 
     2 This is a list of API changes in SDL's version history.
     3 
     4 Version 1.0:
     5 
     6 1.2.16:  This is mostly multiple bug fixes since the previous version.
     7 Changes include:
     8 - Audio, wav loader: security fixes for ADPCM decoding (CVE-2019-7572,
     9   CVE-2019-7573, CVE-2019-7574, CVE-2019-7575, CVE-2019-7576,
    10   CVE-2019-7577, CVE-2019-7578 -- bugs 4490, 4491, 4492, 4493, 4494,
    11   4495, 4496, and 4522.)
    12 - Video, bmp loader:  security fixes for CVE-2019-7635, CVE-2019-7636,
    13   CVE-2019-7638, CVE-2019-13616 (bugs 4498, 4499, 4500, 4517 and 4538.)
    14 - Video, blit: fix handling of alpha channel in Altivec accelerated
    15   blit functions (bug 1424.)
    16 - Video, blit: use fast path for RGB 565 -> 32-bit XRGB 8888
    17 - Video, blit: fix RGBA<->RGBA blit broken with the optimization from
    18   bug 11 (bug 2976.)
    19 - Video: fix integer overflow in SDL_CalculatePitch (CVE-2019-7637,
    20   bug 4497.)
    21 - Mouse: fix SDL_ResetMouse() using a bogus mouse button causing a
    22   negative shift (bug 3593.)
    23 - Cdrom: fix SDL_CDResume() and SDL_CDStop() not returning failure
    24   when they should (bug 4108.)
    25 - Unix, pthread: Fix SDL_SemWaitTimeout() returning -1 instead of
    26   SDL_MUTEX_TIMEDOUT upon timeout (bug 1426.)
    27 - NetBSD: wscons support.
    28 - NetBSD, audio: use AUDIO_GETBUFINFO when available.
    29 - OpenBSD, audio: add sndio support.
    30 - Haiku/BeOS, audio: fix error in buffer size setting (bug 1679.)
    31 - OpenBSD: fix dynamic loading of X libs (bug 1434.)
    32 - X11video: fix missing symbol X11_KeyToUnicode in .so file (bug 1390.
    33   not being an official SDL function, the use of X11_KeyToUnicode() is
    34   strongly discouraged.)
    35 - X11video: fix compilation with libX11 >= 1.5.99.902 (bug 1769.)
    36 - X11video: fix for XChangeProperty() crash (bug 1427.)
    37 - X11video: fix SDL_EnableUNICODE sometimes dropping keyboard events
    38   completely (bug 2325.)
    39 - X11video: fix no SDL_VIDEORESIZE event being generated when the
    40   window manager sets the window size (bug 1859.)
    41 - X11video: fix X11_SetGammaRamp not checking the return value of
    42   XStoreColors (bugs 1979, 3770.)
    43 - X11video: fix SDL_VIDEORESIZE events not received when resizing
    44   window from the corner (inverted logic in X11 ConfigureNotify, i.e.
    45   resize handling - bug 1430.)
    46 - X11video: unblock SDL_WM_GrabInput() GrabNotViewable case (bug 1155.)
    47 - Mac OS X: fix crash on any input in Quartz code (bug 2560.)
    48 - Mac OS X: fix crash in Quartz gamma ramp code.
    49 - Mac OS X: fix build for 10.9 Mavericks or newer (bug 2085.)
    50 - Mac OS X, Quartz: fix cursor transparency (bug 4076.)
    51 - Mac OS X, joystick: update to support Saitek p2500 gamepad (bug 2025)
    52 - Mac OS X, main: updates for -psn_XXX command line arg for Finder
    53   launches in new macOS versions.
    54 - Mac OS X, main: replace deprecated CPS apis in new OSX versions
    55   (bug 4114.)
    56 - Windows, video: fix other window positions/sizes when exiting
    57   fullscreen (bug 3315.)
    58 - Windows, keyboard: reset deadkeys upon SDL_EnableUNICODE() or upon
    59   quit (bug 3332.)
    60 - Windows: Visual Studio project file updates.
    61 - OS/2: Watcom makefile updates.
    62 - FreeBSD, joystick: compile fixes.
    63 - BSD, joystick: increase the number of uhid devices to scan (bug 1561)
    64 - Linux, evdev: ignore joystick axis events if they aren't in a sane
    65   range.
    66 - Linux, joystick: fix Dualshock 3's motion sensors overwrite analog
    67   stick: protect against any axis that isn't reported by EVIOCGBIT but
    68   still sending EV_ABS events (bug 3193.)
    69 - FreeBSD, cdrom: fix CDROM detection misbehaviour for 7.x and newer
    70   (bug 1529.)
    71 - Solaris, audio: fix pulseaudio dynamic linking.
    72 - Solaris, cpuinfo: fix asm syntax error causing build failures.
    73 - Atari: multiple platform code updates.
    74 - RiscOS: cleanups to platform code.
    75 - RiscOS: fix thread starvation in fullscreen mode.
    76 - RiscOS: fix returning from full-screen to 16M colour modes.
    77 - RiscOS: fix receiving PreQuit messages.
    78 - RiscOS: ensure the window size is consistent at different DPIs.
    79 - RiscOS, video: add support for more pixel formats.
    80 - RiscOS: mouse fixes. restore mouse palette when exiting while mouse
    81   is in focus. don't reset mouse focus when recreating the window.
    82 - RiscOS: support Windows and Menu key input.
    83 - Configuration: fix library detection selecting wrong lib (bug 2795.)
    84 - Configuration: fix detecting dynamic library support on powerpc64le
    85   (bug 3481.)
    86 - SDL error: string formatting fixes to deal with nasty corner cases
    87   (bug 2049.)
    88 - SDL_error: handle %lu, %li and %ld in format string (bug 3739.)
    89 - stdlib: updated SDL_qsort() code.
    90 - stdlib: use _strtoi64() and _strtoui64() when available for windows.
    91 - headers, close_code.h: fix unbalanced #pragma pack(pop) for watcom
    92   builds (bug 3781.)
    93 - headers, begin_code.h, close_code.h: updates to SDLCALL and DECLSPEC
    94   macros for OS/2.
    95 - headers, endian: add Watcom inline asm for SDL_Swap16 and SDL_Swap32
    96 - headers, config: updates to default windows and os2 config files.
    97 - headers, SDL_syswm.h, SDL_stdinc.h: include system headers before
    98   packing alignment changes (bug 4149.)
    99 
   100 
   101 1.2.15:  This is a minor bug fix release:
   102 
   103 General Notes:
   104 - Fixed assembly register clobbering in CPU info routines.
   105 - Fixed memory stomp when using stretch blit on large images.
   106 - Fixed pixel corruption with overlapping blits.
   107 - SDL_JOYSTICK_DEVICE can be a colon separated list of joystick devices.
   108 - Disabled MMX blitters since they don't compile on modern compilers.
   109 
   110 Unix Notes:
   111 - Fixed crash in joystick code on newer Linux kernels.
   112 - Fixed channel swizzling for ALSA target with 6-channel output.
   113 - Use the OpenGL GLX_EXT_swap_control extension if available.
   114 - XRandR support is disabled by default because it causes desktop
   115   reconfiguring. It can be enabled with the SDL_VIDEO_X11_XRANDR=1
   116   environment variable.
   117 
   118 Windows Notes:
   119 - Fixed SDL_GL_ACCELERATED_VISUAL handling.
   120 - Fixed application state handling with ALT-Tab.
   121 - Fixed occasional crash handling WM_ACTIVATEAPP in Direct X code.
   122 - Fixed UTF-8 decoding of Russian characters.
   123 
   124 Mac OS X Notes:
   125 - Fixed building and running on Mac OS X 10.7 (Lion).
   126 
   127 
   128 1.2.14:
   129 	Added cast macros for correct usage with C++:
   130 		SDL_reinterpret_cast(type, expression)
   131 		SDL_static_cast(type, expression)
   132 
   133 	Added SDL_VIDEO_FULLSCREEN_DISPLAY as a preferred synonym for 
   134 	SDL_VIDEO_FULLSCREEN_HEAD on X11.
   135 
   136 	Added SDL_DISABLE_LOCK_KEYS environment variable to enable normal
   137 	up/down events for Caps-Lock and Num-Lock keys.
   138 
   139 1.2.13:
   140 	Added SDL_BUTTON_X1 and SDL_BUTTON_X2 constants.
   141 
   142 1.2.12:
   143 	Added SDL_VIDEO_ALLOW_SCREENSAVER to override SDL's disabling
   144 	of the screensaver on Mac OS X and X11.
   145 
   146 1.2.10:
   147 	If SDL_OpenAudio() is passed zero for the desired format
   148 	fields, the following environment variables will be used
   149 	to fill them in:
   150 		SDL_AUDIO_FREQUENCY
   151 		SDL_AUDIO_FORMAT
   152 		SDL_AUDIO_CHANNELS
   153 		SDL_AUDIO_SAMPLES
   154 	If an environment variable is not specified, it will be set
   155 	to a reasonable default value.
   156 
   157 	Added support for the SDL_VIDEO_FULLSCREEN_HEAD environment
   158 	variable, currently supported on X11 Xinerama configurations.
   159 
   160 	Added SDL_GL_SWAP_CONTROL to wait for vsync in OpenGL applications.
   161 
   162 	Added SDL_GL_ACCELERATED_VISUAL to guarantee hardware acceleration.
   163 
   164 	Added current_w and current_h to the SDL_VideoInfo structure,
   165 	which is set to the desktop resolution during video intialization,
   166 	and then set to the current resolution when a video mode is set.
   167 
   168 	SDL_SetVideoMode() now accepts 0 for width or height and will use
   169 	the current video mode (or the desktop mode if no mode has been set.)
   170 
   171 	Added SDL_GetKeyRepeat()
   172 
   173 	Added SDL_config.h, with defaults for various build environments.
   174 
   175 1.2.7:
   176 	Added CPU feature detection functions to SDL_cpuinfo.h:
   177 		SDL_HasRDTSC(), SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE(),
   178 		SDL_HasAltiVec()
   179 	Added function to create RWops from const memory: SDL_RWFromConstMem()
   180 
   181 1.2.6:
   182 	Added SDL_LoadObject(), SDL_LoadFunction(), and SDL_UnloadObject()
   183 
   184 	Added SDL_GL_MULTISAMPLEBUFFERS and SDL_GL_MULTISAMPLESAMPLES for FSAA
   185 
   186 1.2.5:
   187 	Added SDL_BUTTON_WHEELUP (4) and SDL_BUTTON_WHEELDOWN (5)
   188 
   189 	Added SDL_GL_STEREO for stereoscopic OpenGL contexts
   190 
   191 1.2.0:
   192 	Added SDL_VIDEOEXPOSE event to signal that the screen needs to
   193 	be redrawn.  This is currently only delivered to OpenGL windows
   194 	on X11, though it may be delivered in the future when the video
   195 	memory is lost under DirectX.
   196 
   197 1.1.8:
   198 	You can pass SDL_NOFRAME to SDL_VideoMode() to create a window
   199 	that has no title bar or frame decoration.  Fullscreen video
   200 	modes automatically have this flag set.
   201 
   202 	Added a function to query the clipping rectangle for a surface:
   203 		void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
   204 
   205 	Added a function to query the current event filter:
   206 		SDL_EventFilter SDL_GetEventFilter(void)
   207 
   208 	If you pass -1 to SDL_ShowCursor(), it won't change the current
   209 	cursor visibility state, but will still return it.
   210 
   211 	SDL_LockSurface() and SDL_UnlockSurface() are recursive, meaning
   212 	you can nest them as deep as you want, as long as each lock call
   213 	has a matching unlock call.  The surface remains locked until the
   214 	last matching unlock call.
   215 
   216 	Note that you may not blit to or from a locked surface.
   217 
   218 1.1.7:
   219 	The SDL_SetGammaRamp() and SDL_GetGammaRamp() functions now take
   220 	arrays of Uint16 values instead of Uint8 values.  For the most part,
   221 	you can just take your old values and shift them up 8 bits to get
   222 	new correct values for your gamma ramps.
   223 
   224 	You can pass SDL_RLEACCEL in flags passed to SDL_ConvertSurface()
   225         and SDL will try to RLE accelerate colorkey and alpha blits in the
   226 	resulting surface.
   227 
   228 1.1.6:
   229 	Added a function to return the thread ID of a specific thread:
   230 		Uint32 SDL_GetThreadID(SDL_Thread *thread)
   231 	If 'thread' is NULL, this function returns the id for this thread.
   232 
   233 1.1.5:
   234 	The YUV overlay structure has been changed to use an array of
   235 	pitches and pixels representing the planes of a YUV image, to
   236 	better enable hardware acceleration.  The YV12 and IYUV formats
   237 	each have three planes, corresponding to the Y, U, and V portions
   238 	of the image, while packed pixel YUV formats just have one plane.
   239 
   240 	For palettized mode (8bpp), the screen colormap is now split in
   241 	a physical and a logical palette. The physical palette determines
   242 	what colours the screen pixels will get when displayed, and the
   243 	logical palette controls the mapping from blits to/from the screen.
   244 	A new function, SDL_SetPalette() has been added to change
   245 	logical and physical palettes separately. SDL_SetColors() works
   246 	just as before, and is equivalent to calling SDL_SetPalette() with
   247 	a flag argument of (SDL_LOGPAL|SDL_PHYSPAL).
   248 
   249 	SDL_BlitSurface() no longer modifies the source rectangle, only the
   250 	destination rectangle. The width/height members of the destination
   251 	rectangle are ignored, only the position is used.
   252 
   253 	The old source clipping function SDL_SetClipping() has been replaced
   254 	with a more useful function to set the destination clipping rectangle:
   255 		SDL_bool SDL_SetClipRect(SDL_Surface *surface, SDL_Rect *rect)
   256 		
   257 	Added a function to see what subsystems have been initialized:
   258 		Uint32 SDL_WasInit(Uint32 flags)
   259 
   260 	The Big Alpha Flip: SDL now treats alpha as opacity like everybody
   261 	else, and not as transparency:
   262 
   263 	A new cpp symbol: SDL_ALPHA_OPAQUE is defined as 255
   264 	A new cpp symbol: SDL_ALPHA_TRANSPARENT is defined as 0
   265 	Values between 0 and 255 vary from fully transparent to fully opaque.
   266 
   267 	New functions:
   268 	SDL_DisplayFormatAlpha()
   269 	    Returns a surface converted to a format with alpha-channel
   270 	    that can be blit efficiently to the screen. (In other words,
   271 	    like SDL_DisplayFormat() but the resulting surface has
   272 	    an alpha channel.)  This is useful for surfaces with alpha.
   273 	SDL_MapRGBA()
   274 	    Works as SDL_MapRGB() but takes an additional alpha parameter.
   275 	SDL_GetRGBA()
   276 	    Works as SDL_GetRGB() but also returns the alpha value
   277 	    (SDL_ALPHA_OPAQUE for formats without an alpha channel)
   278 
   279 	Both SDL_GetRGB() and SDL_GetRGBA() now always return values in
   280 	the [0..255] interval. Previously, SDL_GetRGB() would return
   281 	(0xf8, 0xfc, 0xf8) for a completely white pixel in RGB565 format.
   282 	(N.B.: This is broken for bit fields < 3 bits.)
   283 
   284 	SDL_MapRGB() returns pixels in which the alpha channel is set opaque.
   285 
   286 	SDL_SetAlpha() can now be used for both setting the per-surface
   287 	alpha, using the new way of thinking of alpha, and also to enable
   288 	and disable per-pixel alpha blending for surfaces with an alpha
   289 	channel:
   290 		To disable alpha blending:
   291 			SDL_SetAlpha(surface, 0, 0);
   292 		To re-enable alpha blending:
   293 			SDL_SetAlpha(surface, SDL_SRCALPHA, 0);
   294 	Surfaces with an alpha channel have blending enabled by default.
   295 
   296 	SDL_SetAlpha() now accepts SDL_RLEACCEL as a flag, which requests
   297 	RLE acceleration of blits, just as like with SDL_SetColorKey().
   298 	This flag can be set for both surfaces with an alpha channel
   299 	and surfaces with an alpha value set by SDL_SetAlpha().
   300 	As always, RLE surfaces must be locked before pixel access is
   301 	allowed, and unlocked before any other SDL operations are done
   302 	on it.
   303 
   304 	The blit semantics for surfaces with and without alpha and colorkey
   305 	have now been defined:
   306 
   307 	RGBA->RGB:
   308 	    SDL_SRCALPHA set:
   309 		alpha-blend (using alpha-channel).
   310 		SDL_SRCCOLORKEY ignored.
   311 	    SDL_SRCALPHA not set:
   312 		copy RGB.
   313 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   314 		RGB values of the source colour key, ignoring alpha in the
   315 		comparison.
   316 
   317 	RGB->RGBA:
   318 	    SDL_SRCALPHA set:
   319 		alpha-blend (using the source per-surface alpha value);
   320 		set destination alpha to opaque.
   321 	    SDL_SRCALPHA not set:
   322 		copy RGB, set destination alpha to opaque.
   323 	    both:
   324 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   325 		source colour key.
   326 
   327 	RGBA->RGBA:
   328 	    SDL_SRCALPHA set:
   329 		alpha-blend (using the source alpha channel) the RGB values;
   330 		leave destination alpha untouched. [Note: is this correct?]
   331 		SDL_SRCCOLORKEY ignored.
   332 	    SDL_SRCALPHA not set:
   333 		copy all of RGBA to the destination.
   334 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   335 		RGB values of the source colour key, ignoring alpha in the
   336 		comparison.
   337 
   338 	RGB->RGB: 
   339 	    SDL_SRCALPHA set:
   340 		alpha-blend (using the source per-surface alpha value).
   341 	    SDL_SRCALPHA not set:
   342 		copy RGB.
   343 	    both:
   344 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   345 		source colour key.
   346 
   347 	As a special case, blits from surfaces with per-surface alpha
   348 	value of 128 (50% transparency) are optimised and much faster
   349 	than other alpha values. This does not apply to surfaces with
   350 	alpha channels (per-pixel alpha).
   351 
   352 	New functions for manipulating the gamma of the display have
   353 	been added:
   354 		int SDL_SetGamma(float red, float green, float blue);
   355 		int SDL_SetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
   356 		int SDL_GetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
   357 	Gamma ramps are tables with 256 entries which map the screen color
   358 	components into actually displayed colors.  For an example of
   359 	implementing gamma correction and gamma fades, see test/testgamma.c
   360 	Gamma control is not supported on all hardware.
   361 
   362 1.1.4:
   363 	The size of the SDL_CDtrack structure changed from 8 to 12 bytes
   364 	as the size of the length member was extended to 32 bits.
   365 
   366         You can now use SDL for 2D blitting with a GL mode by passing the
   367 	SDL_OPENGLBLIT flag to SDL_SetVideoMode().  You can specify 16 or
   368 	32 bpp, and the data in the framebuffer is put into the GL scene
   369 	when you call SDL_UpdateRects(), and the scene will be visible
   370 	when you call SDL_GL_SwapBuffers().
   371 
   372 	Run the "testgl" test program with the -logo command line option
   373 	to see an example of this blending of 2D and 3D in SDL.
   374 
   375 1.1.3:
   376 	Added SDL_FreeRW() to the API, to complement SDL_AllocRW()
   377 
   378 	Added resizable window support - just add SDL_RESIZABLE to the
   379 	SDL_SetVideoMode() flags, and then wait for SDL_VIDEORESIZE events.
   380 	See SDL_events.h for details on the new SDL_ResizeEvent structure.
   381 
   382 	Added condition variable support, based on mutexes and semaphores.
   383 		SDL_CreateCond()
   384 		SDL_DestroyCond()
   385 		SDL_CondSignal()
   386 		SDL_CondBroadcast()
   387 		SDL_CondWait()
   388 		SDL_CondTimedWait()
   389 	The new function prototypes are in SDL_mutex.h
   390 
   391 	Added counting semaphore support, based on the mutex primitive.
   392 		SDL_CreateSemaphore()
   393 		SDL_DestroySemaphore()
   394 		SDL_SemWait()
   395 		SDL_SemTryWait()
   396 		SDL_SemWaitTimeout()
   397 		SDL_SemPost()
   398 		SDL_SemValue()
   399 	The new function prototypes are in SDL_mutex.h
   400 
   401 	Added support for asynchronous blitting.  To take advantage of this,
   402 	you must set the SDL_ASYNCBLIT flag when setting the video mode and
   403 	creating surfaces that you want accelerated in this way.  You must
   404 	lock surfaces that have this flag set, and the lock will block until
   405 	any queued blits have completed.
   406 
   407 	Added YUV video overlay support.
   408 	The supported YUV formats are: YV12, IYUV, YUY2, UYVY, and YVYU.
   409 	This function creates an overlay surface:
   410 		SDL_CreateYUVOverlay()
   411 	You must lock and unlock the overlay to get access to the data:
   412 		SDL_LockYUVOverlay() SDL_UnlockYUVOverlay()
   413 	You can then display the overlay:
   414 		SDL_DisplayYUVOverlay()
   415 	You must free the overlay when you are done using it:
   416 		SDL_FreeYUVOverlay()
   417 	See SDL_video.h for the full function prototypes.
   418 
   419 	The joystick hat position constants have been changed:
   420 	Old constant            New constant
   421 	------------            ------------
   422 	     0                  SDL_HAT_CENTERED
   423 	     1                  SDL_HAT_UP
   424 	     2                  SDL_HAT_RIGHTUP
   425 	     3                  SDL_HAT_RIGHT
   426 	     4                  SDL_HAT_RIGHTDOWN
   427 	     5                  SDL_HAT_DOWN
   428 	     6                  SDL_HAT_LEFTDOWN
   429 	     7                  SDL_HAT_LEFT
   430 	     8                  SDL_HAT_LEFTUP
   431 	The new constants are bitmasks, so you can check for the
   432 	individual axes like this:
   433 		if ( hat_position & SDL_HAT_UP ) {
   434 		}
   435 	and you'll catch left-up, up, and right-up.
   436 
   437 1.1.2:
   438 	Added multiple timer support:
   439 		SDL_AddTimer() and SDL_RemoveTimer()
   440 
   441 	SDL_WM_SetIcon() now respects the icon colorkey if mask is NULL.
   442 
   443 1.1.0:
   444 	Added initial OpenGL support.
   445 	First set GL attributes (such as RGB depth, alpha depth, etc.)
   446 		SDL_GL_SetAttribute()
   447 	Then call SDL_SetVideoMode() with the SDL_OPENGL flag.
   448 	Perform all of your normal GL drawing.
   449 	Finally swap the buffers with the new SDL function:
   450 		SDL_GL_SwapBuffers()
   451 	See the new 'testgl' test program for an example of using GL with SDL.
   452 
   453 	You can load GL extension functions by using the function:
   454 		SDL_GL_LoadProcAddress()
   455 
   456 	Added functions to initialize and cleanup specific SDL subsystems:
   457 		SDL_InitSubSystem() and SDL_QuitSubSystem()
   458 
   459 	Added user-defined event type:
   460 		typedef struct {
   461         		Uint8 type;
   462         		int code;
   463         		void *data1;
   464         		void *data2;
   465 		} SDL_UserEvent;
   466 	This structure is in the "user" member of an SDL_Event.
   467 
   468 	Added a function to push events into the event queue:
   469 		SDL_PushEvent()
   470 
   471 	Example of using the new SDL user-defined events:
   472 	{
   473 		SDL_Event event;
   474 
   475 		event.type = SDL_USEREVENT;
   476 		event.user.code = my_event_code;
   477 		event.user.data1 = significant_data;
   478 		event.user.data2 = 0;
   479 		SDL_PushEvent(&event);
   480 	}
   481 
   482 	Added a function to get mouse deltas since last query:
   483 		SDL_GetRelativeMouseState()
   484 
   485 	Added a boolean datatype to SDL_types.h:
   486 		SDL_bool = { SDL_TRUE, SDL_FALSE }
   487 
   488 	Added a function to get the current audio status:
   489 		SDL_GetAudioState();
   490 	It returns one of:
   491 		SDL_AUDIO_STOPPED,
   492 		SDL_AUDIO_PLAYING,
   493 		SDL_AUDIO_PAUSED
   494 
   495 	Added an AAlib driver (ASCII Art) - by Stephane Peter.
   496 
   497 1.0.6:
   498 	The input grab state is reset after each call to SDL_SetVideoMode().
   499 	The input is grabbed by default in fullscreen mode, and ungrabbed in
   500 	windowed mode.  If you want to set input grab to a particular value,
   501 	you should set it after each call to SDL_SetVideoMode().
   502 
   503 1.0.5:
   504 	Exposed SDL_AudioInit(), SDL_VideoInit()
   505 	Added SDL_AudioDriverName() and SDL_VideoDriverName()
   506 
   507 	Added new window manager function:
   508 		SDL_WM_ToggleFullScreen()
   509 	This is currently implemented only on Linux
   510 
   511 	The ALT-ENTER code has been removed - it's not appropriate for a
   512 	lib to bind keys when they aren't even emergency escape sequences.
   513 
   514 	ALT-ENTER functionality can be implemented with the following code:
   515 
   516 	int Handle_AltEnter(const SDL_Event *event)
   517 	{
   518 	    if ( event->type == SDL_KEYDOWN ) {
   519 	        if ( (event->key.keysym.sym == SDLK_RETURN) &&
   520 	             (event->key.keysym.mod & KMOD_ALT) ) {   
   521 	                SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());
   522 	                return(0);
   523 	        }
   524 	    }
   525 	    return(1);
   526 	}
   527 	SDL_SetEventFilter(Handle_AltEnter);
   528 
   529 1.0.3:
   530 	Under X11, if you grab the input and hide the mouse cursor,
   531 	the mouse will go into a "relative motion" mode where you
   532 	will always get relative motion events no matter how far in
   533 	each direction you move the mouse - relative motion is not
   534 	bounded by the edges of the window (though the absolute values
   535 	of the mouse positions are clamped by the size of the window).
   536 	The SVGAlib, framebuffer console, and DirectInput drivers all
   537 	have this behavior naturally, and the GDI and BWindow drivers
   538 	never go into "relative motion" mode.
   539 
   540 1.0.2:
   541 	Added a function to enable keyboard repeat:
   542 		SDL_EnableKeyRepeat()
   543 
   544 	Added a function to grab the mouse and keyboard input
   545 		SDL_WM_GrabInput()
   546 
   547 	Added a function to iconify the window.
   548 		SDL_WM_IconifyWindow()
   549 	If this function succeeds, the application will receive an event
   550 	signaling SDL_APPACTIVE event 
   551 
   552 1.0.1:
   553 	Added constants to SDL_audio.h for 16-bit native byte ordering:
   554 		AUDIO_U16SYS, AUDIO_S16SYS
   555 
   556 1.0.0:
   557 	New public release
   558 
   559 Version 0.11:
   560 
   561 0.11.5:
   562 	A new function SDL_GetVideoSurface() has been added, and returns
   563 	a pointer to the current display surface.
   564 
   565 	SDL_AllocSurface() has been renamed SDL_CreateRGBSurface(), and
   566 	a new function SDL_CreateRGBSurfaceFrom() has been added to allow
   567 	creating an SDL surface from an existing pixel data buffer.
   568 
   569 	Added SDL_GetRGB() to the headers and documentation.
   570 
   571 0.11.4:
   572 	SDL_SetLibraryPath() is no longer meaningful, and has been removed.
   573 
   574 0.11.3:
   575 	A new flag for SDL_Init(), SDL_INIT_NOPARACHUTE, prevents SDL from
   576 	installing fatal signal handlers on operating systems that support
   577 	them.
   578 
   579 Version 0.9:
   580 
   581 0.9.15:
   582 	SDL_CreateColorCursor() has been removed.  Color cursors should
   583 	be implemented as sprites, blitted by the application when the
   584 	cursor moves.  To get smooth color cursor updates when the app
   585 	is busy, pass the SDL_INIT_EVENTTHREAD flag to SDL_Init().  This
   586 	allows you to handle the mouse motion in another thread from an
   587 	event filter function, but is currently only supported by Linux
   588 	and BeOS.  Note that you'll have to protect the display surface
   589 	from multi-threaded access by using mutexes if you do this.
   590 
   591 	Thread-safe surface support has been removed from SDL.
   592 	This makes blitting somewhat faster, by removing SDL_MiddleBlit().
   593 	Code that used SDL_MiddleBlit() should use SDL_LowerBlit() instead.
   594 	You can make your surfaces thread-safe by allocating your own
   595 	mutex and making lock/unlock calls around accesses to your surface.
   596 
   597 0.9.14:
   598 	SDL_GetMouseState() now takes pointers to int rather than Uint16.
   599 
   600 	If you set the SDL_WINDOWID environment variable under UNIX X11,
   601 	SDL will use that as the main window instead of creating it's own.
   602 	This is an unsupported extension to SDL, and not portable at all.
   603 
   604 0.9.13:
   605 	Added a function SDL_SetLibraryPath() which can be used to specify
   606 	the directory containing the SDL dynamic libraries.  This is useful
   607 	for commercial applications which ship with particular versions
   608 	of the libraries, and for security on multi-user systems.
   609 	If this function is not used, the default system directories are 
   610 	searched using the native dynamic object loading mechanism.
   611 
   612 	In order to support C linkage under Visual C++, you must declare
   613 	main() without any return type:
   614 		main(int argc, char *argv[]) {
   615 			/* Do the program... */
   616 			return(0);
   617 		}
   618 	C++ programs should also return a value if compiled under VC++.
   619 
   620 	The blit_endian member of the SDL_VideoInfo struct has been removed.
   621 
   622 	SDL_SymToASCII() has been replaced with SDL_GetKeyName(), so there
   623 	is now no longer any function to translate a keysym to a character.
   624 
   625 	The SDL_keysym structure has been extended with a 'scancode' and
   626 	'unicode' member.  The 'scancode' is a hardware specific scancode
   627 	for the key that was pressed, and may be 0.  The 'unicode' member
   628 	is a 16-bit UNICODE translation of the key that was pressed along
   629 	with any modifiers or compose keys that have been pressed.
   630 	If no UNICODE translation exists for the key, 'unicode' will be 0.
   631 
   632 	Added a function SDL_EnableUNICODE() to enable/disable UNICODE
   633 	translation of character keypresses.  Translation defaults off.
   634 
   635 	To convert existing code to use the new API, change code which
   636 	uses SDL_SymToASCII() to get the keyname to use SDL_GetKeyName(),
   637 	and change code which uses it to get the ASCII value of a sym to
   638 	use the 'unicode' member of the event keysym.
   639 
   640 0.9.12:
   641 	There is partial support for 64-bit datatypes.  I don't recommend 
   642 	you use this if you have a choice, because 64-bit datatypes are not
   643 	supported on many platforms.  On platforms for which it is supported,
   644 	the SDL_HAS_64BIT_TYPE C preprocessor define will be enabled, and
   645 	you can use the Uint64 and Sint64 datatypes.
   646 
   647 	Added functions to SDL_endian.h to support 64-bit datatypes:
   648 	    SDL_SwapLE64(), SDL_SwapBE64(),
   649 	    SDL_ReadLE64(), SDL_ReadBE64(), SDL_WriteLE64(), SDL_WriteBE64()
   650 
   651 	A new member "len_ratio" has been added to the SDL_AudioCVT structure,
   652 	and allows you to determine either the original buffer length or the
   653 	converted buffer length, given the other.
   654 
   655 	A new function SDL_FreeWAV() has been added to the API to free data
   656 	allocated by SDL_LoadWAV_RW().  This is necessary under Win32 since
   657 	the gcc compiled DLL uses a different heap than VC++ compiled apps.
   658 
   659 	SDL now has initial support for international keyboards using the
   660 	Latin character set.
   661 	If a particular mapping is desired, you can set the DEFAULT_KEYBOARD
   662 	compile-time variable, or you can set the environment variable 
   663 	"SDL_KEYBOARD" to a string identifying the keyboard mapping you desire.
   664 	The valid values for these variables can be found in SDL_keyboard.c
   665 
   666 	Full support for German and French keyboards under X11 is implemented.
   667 
   668 0.9.11:
   669 	The THREADED_EVENTS compile-time define has been replaced with the
   670 	SDL_INIT_EVENTTHREAD flag.  If this flag is passed to SDL_Init(),
   671 	SDL will create a separate thread to perform input event handling.
   672 	If this flag is passed to SDL_Init(), and the OS doesn't support 
   673 	event handling in a separate thread, SDL_Init() will fail.
   674 	Be sure to add calls to SDL_Delay() in your main thread to allow
   675 	the OS to schedule your event thread, or it may starve, leading
   676 	to slow event delivery and/or dropped events.
   677 	Currently MacOS and Win32 do not support this flag, while BeOS 
   678 	and Linux do support it.  I recommend that your application only
   679 	use this flag if absolutely necessary.
   680 
   681 	The SDL thread function passed to SDL_CreateThread() now returns a
   682 	status.  This status can be retrieved by passing a non-NULL pointer
   683 	as the 'status' argument to SDL_WaitThread().
   684 
   685 	The volume parameter to SDL_MixAudio() has been increased in range
   686 	from (0-8) to (0-128)
   687 
   688 	SDL now has a data source abstraction which can encompass a file,
   689 	an area of memory, or any custom object you can envision.  It uses
   690 	these abstractions, SDL_RWops, in the endian read/write functions,
   691 	and the built-in WAV and BMP file loaders.  This means you can load
   692 	WAV chunks from memory mapped files, compressed archives, network
   693 	pipes, or anything else that has a data read abstraction.
   694 
   695 	There are three built-in data source abstractions:
   696 	    SDL_RWFromFile(), SDL_RWFromFP(), SDL_RWFromMem()
   697 	along with a generic data source allocation function:
   698 	    SDL_AllocRW()
   699 	These data sources can be used like stdio file pointers with the
   700 	following convenience functions:
   701 	    SDL_RWseek(), SDL_RWread(), SDL_RWwrite(), SDL_RWclose()
   702 	These functions are defined in the new header file "SDL_rwops.h"
   703 
   704 	The endian swapping functions have been turned into macros for speed
   705 	and SDL_CalculateEndian() has been removed.  SDL_endian.h now defines
   706 	SDL_BYTEORDER as either SDL_BIG_ENDIAN or SDL_LIL_ENDIAN depending on
   707 	the endianness of the host system.
   708 
   709 	The endian read/write functions now take an SDL_RWops pointer
   710 	instead of a stdio FILE pointer, to support the new data source
   711 	abstraction.
   712 
   713 	The SDL_*LoadWAV() functions have been replaced with a single
   714 	SDL_LoadWAV_RW() function that takes a SDL_RWops pointer as it's
   715 	first parameter, and a flag whether or not to automatically 
   716 	free it as the second parameter.  SDL_LoadWAV() is a macro for
   717 	backward compatibility and convenience:
   718 	    SDL_LoadWAV_RW(SDL_RWFromFile("sample.wav", "rb"), 1, ...);
   719 
   720 	The SDL_*LoadBMP()/SDL_*SaveBMP() functions have each been replaced
   721 	with a single function that takes a SDL_RWops pointer as it's
   722 	first parameter, and a flag whether or not to automatically 
   723 	free it as the second parameter.  SDL_LoadBMP() and SDL_SaveBMP()
   724 	are macros for backward compatibility and convenience:
   725 	    SDL_LoadBMP_RW(SDL_RWFromFile("sample.bmp", "rb"), 1, ...);
   726 	    SDL_SaveBMP_RW(SDL_RWFromFile("sample.bmp", "wb"), 1, ...);
   727 	Note that these functions use SDL_RWseek() extensively, and should
   728 	not be used on pipes or other non-seekable data sources.
   729 
   730 0.9.10:
   731 	The Linux SDL_SysWMInfo and SDL_SysWMMsg structures have been 
   732 	extended to support multiple types of display drivers, as well as
   733         safe access to the X11 display when THREADED_EVENTS is enabled.
   734         The new structures are documented in the SDL_syswm.h header file.
   735 
   736 	Thanks to John Elliott <jce@seasip.demon.co.uk>, the UK keyboard
   737 	should now work properly, as well as the "Windows" keys on US
   738 	keyboards.
   739 
   740 	The Linux CD-ROM code now reads the CD-ROM devices from /etc/fstab
   741 	instead of trying to open each block device on the system.
   742 	The CD must be listed in /etc/fstab as using the iso9660 filesystem.
   743 
   744 	On Linux, if you define THREADED_EVENTS at compile time, a separate
   745 	thread will be spawned to gather X events asynchronously from the
   746 	graphics updates.  This hasn't been extensively tested, but it does
   747 	provide a means of handling keyboard and mouse input in a separate
   748 	thread from the graphics thread.  (This is now enabled by default.)
   749 
   750 	A special access function SDL_PeepEvents() allows you to manipulate
   751 	the event queue in a thread-safe manner, including peeking at events,
   752 	removing events of a specified type, and adding new events of arbitrary
   753 	type to the queue (use the new 'user' member of the SDL_Event type).
   754 
   755 	If you use SDL_PeepEvents() to gather events, then the main graphics
   756 	thread needs to call SDL_PumpEvents() periodically to drive the event
   757 	loop and generate input events.  This is not necessary if SDL has been 
   758 	compiled with THREADED_EVENTS defined, but doesn't hurt.
   759 
   760 	A new function SDL_ThreadID() returns the identifier associated with
   761 	the current thread.
   762 
   763 0.9.9:
   764 	The AUDIO_STEREO format flag has been replaced with a new 'channels'
   765 	member of the SDL_AudioSpec structure.  The channels are 1 for mono
   766 	audio, and 2 for stereo audio.  In the future more channels may be
   767 	supported for 3D surround sound.
   768 
   769 	The SDL_MixAudio() function now takes an additional volume parameter,
   770 	which should be set to SDL_MIX_MAXVOLUME for compatibility with the
   771 	original function.
   772 
   773 	The CD-ROM functions which take a 'cdrom' parameter can now be
   774 	passed NULL, and will act on the last successfully opened CD-ROM.
   775 
   776 0.9.8:
   777 	No changes, bugfixes only.
   778 	
   779 0.9.7:
   780 	No changes, bugfixes only.
   781 	
   782 0.9.6:
   783 	Added a fast rectangle fill function: SDL_FillRect()
   784 
   785 	Addition of a useful function for getting info on the video hardware:
   786 	    const SDL_VideoInfo *SDL_GetVideoInfo(void)
   787         This function replaces SDL_GetDisplayFormat().
   788 
   789 	Initial support for double-buffering:
   790 	  Use the SDL_DOUBLEBUF flag in SDL_SetVideoMode()
   791 	  Update the screen with a new function: SDL_Flip()
   792 
   793 	SDL_AllocSurface() takes two new flags:
   794 	SDL_SRCCOLORKEY means that the surface will be used for colorkey blits
   795 	  and if the hardware supports hardware acceleration of colorkey blits
   796 	  between two surfaces in video memory, to place the surface in video
   797 	  memory if possible, otherwise it will be placed in system memory.
   798 	SDL_SRCALPHA means that the surface will be used for alpha blits and
   799 	  if the hardware supports hardware acceleration of alpha blits between
   800 	  two surfaces in video memory, to place the surface in video memory
   801 	  if possible, otherwise it will be placed in system memory.
   802 	SDL_HWSURFACE now means that the surface will be created with the 
   803 	  same format as the display surface, since having surfaces in video
   804 	  memory is only useful for fast blitting to the screen, and you can't
   805 	  blit surfaces with different surface formats in video memory.
   806 
   807 0.9.5:
   808 	You can now pass a NULL mask to SDL_WM_SetIcon(), and it will assume
   809 	that the icon consists of the entire image.
   810 
   811 	SDL_LowerBlit() is back -- but don't use it on the display surface.
   812 	It is exactly the same as SDL_MiddleBlit(), but doesn't check for
   813 	thread safety.
   814 
   815 	Added SDL_FPLoadBMP(), SDL_FPSaveBMP(), SDL_FPLoadWAV(), which take
   816 	a FILE pointer instead of a file name.
   817 
   818 	Added CD-ROM audio control API:
   819 	    SDL_CDNumDrives()
   820 	    SDL_CDName()
   821 	    SDL_CDOpen()
   822 	    SDL_CDStatus()
   823 	    SDL_CDPlayTracks()
   824 	    SDL_CDPlay()
   825 	    SDL_CDPause()
   826 	    SDL_CDResume()
   827 	    SDL_CDStop()
   828 	    SDL_CDEject()
   829 	    SDL_CDClose()
   830 
   831 0.9.4:
   832 	No changes, bugfixes only.
   833 
   834 0.9.3:
   835 	Mouse motion event now includes relative motion information:
   836 	    Sint16 event->motion.xrel, Sint16 event->motion.yrel
   837 
   838 	X11 keyrepeat handling can be disabled by defining IGNORE_X_KEYREPEAT
   839 	    (Add -DIGNORE_X_KEYREPEAT to CFLAGS line in obj/x11Makefile)
   840 
   841 0.9.2:
   842 	No changes, bugfixes only.
   843 
   844 0.9.1:
   845 	Removed SDL_MapSurface() and SDL_UnmapSurface() -- surfaces are now
   846 	automatically mapped on blit.
   847 
   848 0.8.0:
   849 	SDL stable release