WhatsNew
author Ben Avison <bavison@riscosopen.org>
Thu, 31 Oct 2019 14:00:28 +0300
branchSDL-1.2
changeset 13219 4f88e197acad
parent 13066 192c2a5fdd21
child 13224 9ed6ca274a7e
permissions -rw-r--r--
ARM: Create configure option --enable-arm-neon to govern assembly optimizations
---
configure.in | 39 +++++++++++++++++++++++++++++++++++++++
include/SDL_config.h.in | 1 +
include/SDL_cpuinfo.h | 3 +++
src/cpuinfo/SDL_cpuinfo.c | 37 +++++++++++++++++++++++++++++++++++++
4 files changed, 80 insertions(+)
     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: correct vec_perm() application on little-endian 64-bit
    17   PowerPC (bug 4791. cf.: RedHat bug 1392465.)
    18 - Video, blit: use fast path for RGB 565 -> 32-bit XRGB 8888
    19 - Video, blit: fix RGBA<->RGBA blit broken with the optimization from
    20   bug 11 (bug 2976.)
    21 - Video: fix integer overflow in SDL_CalculatePitch (CVE-2019-7637,
    22   bug 4497.)
    23 - Mouse: fix SDL_ResetMouse() using a bogus mouse button causing a
    24   negative shift (bug 3593.)
    25 - Cdrom: fix SDL_CDResume() and SDL_CDStop() not returning failure
    26   when they should (bug 4108.)
    27 - Unix, pthread: Fix SDL_SemWaitTimeout() returning -1 instead of
    28   SDL_MUTEX_TIMEDOUT upon timeout (bug 1426.)
    29 - NetBSD: wscons support.
    30 - NetBSD, audio: use AUDIO_GETBUFINFO when available.
    31 - OpenBSD, audio: add sndio support.
    32 - Haiku/BeOS, audio: fix error in buffer size setting (bug 1679.)
    33 - OpenBSD: fix dynamic loading of X libs (bug 1434.)
    34 - X11video: fix missing symbol X11_KeyToUnicode in .so file (bug 1390.
    35   not being an official SDL function, the use of X11_KeyToUnicode() is
    36   strongly discouraged.)
    37 - X11video: fix compilation with libX11 >= 1.5.99.902 (bug 1769.)
    38 - X11video: fix for XChangeProperty() crash (bug 1427.)
    39 - X11video: fix SDL_EnableUNICODE sometimes dropping keyboard events
    40   completely (bug 2325.)
    41 - X11video: fix no SDL_VIDEORESIZE event being generated when the
    42   window manager sets the window size (bug 1859.)
    43 - X11video: fix X11_SetGammaRamp not checking the return value of
    44   XStoreColors (bugs 1979, 3770.)
    45 - X11video: fix SDL_VIDEORESIZE events not received when resizing
    46   window from the corner (inverted logic in X11 ConfigureNotify, i.e.
    47   resize handling - bug 1430.)
    48 - X11video: unblock SDL_WM_GrabInput() GrabNotViewable case (bug 1155.)
    49 - Mac OS X: fix crash on any input in Quartz code (bug 2560.)
    50 - Mac OS X: fix crash in Quartz gamma ramp code.
    51 - Mac OS X: fix build for 10.9 Mavericks or newer (bug 2085.)
    52 - Mac OS X, Quartz: fix cursor transparency (bug 4076.)
    53 - Mac OS X, joystick: update to support Saitek p2500 gamepad (bug 2025)
    54 - Mac OS X, main: updates for -psn_XXX command line arg for Finder
    55   launches in new macOS versions.
    56 - Mac OS X, main: replace deprecated CPS apis in new OSX versions
    57   (bug 4114.)
    58 - Windows, video: fix other window positions/sizes when exiting
    59   fullscreen (bug 3315.)
    60 - Windows, keyboard: reset deadkeys upon SDL_EnableUNICODE() or upon
    61   quit (bug 3332.)
    62 - Windows: Visual Studio project file updates.
    63 - OS/2: Watcom makefile updates.
    64 - FreeBSD, joystick: compile fixes.
    65 - BSD, joystick: increase the number of uhid devices to scan (bug 1561)
    66 - Linux, evdev: ignore joystick axis events if they aren't in a sane
    67   range.
    68 - Linux, joystick: fix Dualshock 3's motion sensors overwrite analog
    69   stick: protect against any axis that isn't reported by EVIOCGBIT but
    70   still sending EV_ABS events (bug 3193.)
    71 - FreeBSD, cdrom: fix CDROM detection misbehaviour for 7.x and newer
    72   (bug 1529.)
    73 - Solaris, audio: fix pulseaudio dynamic linking.
    74 - Solaris, cpuinfo: fix asm syntax error causing build failures.
    75 - Atari: multiple platform code updates.
    76 - RISC OS: cleanups to platform code.
    77 - RISC OS: fix thread starvation in fullscreen mode.
    78 - RISC OS: fix returning from full-screen to 16M colour modes.
    79 - RISC OS: fix receiving PreQuit messages.
    80 - RISC OS: ensure the window size is consistent at different DPIs.
    81 - RISC OS, video: add support for more pixel formats.
    82 - RISC OS: mouse fixes. restore mouse palette when exiting while mouse
    83   is in focus. don't reset mouse focus when recreating the window.
    84 - RISC OS: support Windows and Menu key input.
    85 - RISC OS: implement SDL_WM_IconifyWindow()
    86 - RISC OS: send SDL_APPACTIVE events when iconizing the window.
    87 - Configuration: fix library detection selecting wrong lib (bug 2795.)
    88 - Configuration: fix detecting dynamic library support on powerpc64le
    89   (bug 3481.)
    90 - SDL error: string formatting fixes to deal with nasty corner cases
    91   (bug 2049.)
    92 - SDL_error: handle %lu, %li and %ld in format string (bug 3739.)
    93 - stdlib: updated SDL_qsort() code.
    94 - stdlib: use _strtoi64() and _strtoui64() when available for windows.
    95 - headers, close_code.h: fix unbalanced #pragma pack(pop) for watcom
    96   builds (bug 3781.)
    97 - headers, begin_code.h, close_code.h: updates to SDLCALL and DECLSPEC
    98   macros for OS/2.
    99 - headers, endian: add Watcom inline asm for SDL_Swap16 and SDL_Swap32
   100 - headers, config: updates to default windows and os2 config files.
   101 - headers, SDL_syswm.h, SDL_stdinc.h: include system headers before
   102   packing alignment changes (bug 4149.)
   103 
   104 
   105 1.2.15:  This is a minor bug fix release:
   106 
   107 General Notes:
   108 - Fixed assembly register clobbering in CPU info routines.
   109 - Fixed memory stomp when using stretch blit on large images.
   110 - Fixed pixel corruption with overlapping blits.
   111 - SDL_JOYSTICK_DEVICE can be a colon separated list of joystick devices.
   112 - Disabled MMX blitters since they don't compile on modern compilers.
   113 
   114 Unix Notes:
   115 - Fixed crash in joystick code on newer Linux kernels.
   116 - Fixed channel swizzling for ALSA target with 6-channel output.
   117 - Use the OpenGL GLX_EXT_swap_control extension if available.
   118 - XRandR support is disabled by default because it causes desktop
   119   reconfiguring. It can be enabled with the SDL_VIDEO_X11_XRANDR=1
   120   environment variable.
   121 
   122 Windows Notes:
   123 - Fixed SDL_GL_ACCELERATED_VISUAL handling.
   124 - Fixed application state handling with ALT-Tab.
   125 - Fixed occasional crash handling WM_ACTIVATEAPP in Direct X code.
   126 - Fixed UTF-8 decoding of Russian characters.
   127 
   128 Mac OS X Notes:
   129 - Fixed building and running on Mac OS X 10.7 (Lion).
   130 
   131 
   132 1.2.14:
   133 	Added cast macros for correct usage with C++:
   134 		SDL_reinterpret_cast(type, expression)
   135 		SDL_static_cast(type, expression)
   136 
   137 	Added SDL_VIDEO_FULLSCREEN_DISPLAY as a preferred synonym for 
   138 	SDL_VIDEO_FULLSCREEN_HEAD on X11.
   139 
   140 	Added SDL_DISABLE_LOCK_KEYS environment variable to enable normal
   141 	up/down events for Caps-Lock and Num-Lock keys.
   142 
   143 1.2.13:
   144 	Added SDL_BUTTON_X1 and SDL_BUTTON_X2 constants.
   145 
   146 1.2.12:
   147 	Added SDL_VIDEO_ALLOW_SCREENSAVER to override SDL's disabling
   148 	of the screensaver on Mac OS X and X11.
   149 
   150 1.2.10:
   151 	If SDL_OpenAudio() is passed zero for the desired format
   152 	fields, the following environment variables will be used
   153 	to fill them in:
   154 		SDL_AUDIO_FREQUENCY
   155 		SDL_AUDIO_FORMAT
   156 		SDL_AUDIO_CHANNELS
   157 		SDL_AUDIO_SAMPLES
   158 	If an environment variable is not specified, it will be set
   159 	to a reasonable default value.
   160 
   161 	Added support for the SDL_VIDEO_FULLSCREEN_HEAD environment
   162 	variable, currently supported on X11 Xinerama configurations.
   163 
   164 	Added SDL_GL_SWAP_CONTROL to wait for vsync in OpenGL applications.
   165 
   166 	Added SDL_GL_ACCELERATED_VISUAL to guarantee hardware acceleration.
   167 
   168 	Added current_w and current_h to the SDL_VideoInfo structure,
   169 	which is set to the desktop resolution during video intialization,
   170 	and then set to the current resolution when a video mode is set.
   171 
   172 	SDL_SetVideoMode() now accepts 0 for width or height and will use
   173 	the current video mode (or the desktop mode if no mode has been set.)
   174 
   175 	Added SDL_GetKeyRepeat()
   176 
   177 	Added SDL_config.h, with defaults for various build environments.
   178 
   179 1.2.7:
   180 	Added CPU feature detection functions to SDL_cpuinfo.h:
   181 		SDL_HasRDTSC(), SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE(),
   182 		SDL_HasAltiVec()
   183 	Added function to create RWops from const memory: SDL_RWFromConstMem()
   184 
   185 1.2.6:
   186 	Added SDL_LoadObject(), SDL_LoadFunction(), and SDL_UnloadObject()
   187 
   188 	Added SDL_GL_MULTISAMPLEBUFFERS and SDL_GL_MULTISAMPLESAMPLES for FSAA
   189 
   190 1.2.5:
   191 	Added SDL_BUTTON_WHEELUP (4) and SDL_BUTTON_WHEELDOWN (5)
   192 
   193 	Added SDL_GL_STEREO for stereoscopic OpenGL contexts
   194 
   195 1.2.0:
   196 	Added SDL_VIDEOEXPOSE event to signal that the screen needs to
   197 	be redrawn.  This is currently only delivered to OpenGL windows
   198 	on X11, though it may be delivered in the future when the video
   199 	memory is lost under DirectX.
   200 
   201 1.1.8:
   202 	You can pass SDL_NOFRAME to SDL_VideoMode() to create a window
   203 	that has no title bar or frame decoration.  Fullscreen video
   204 	modes automatically have this flag set.
   205 
   206 	Added a function to query the clipping rectangle for a surface:
   207 		void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
   208 
   209 	Added a function to query the current event filter:
   210 		SDL_EventFilter SDL_GetEventFilter(void)
   211 
   212 	If you pass -1 to SDL_ShowCursor(), it won't change the current
   213 	cursor visibility state, but will still return it.
   214 
   215 	SDL_LockSurface() and SDL_UnlockSurface() are recursive, meaning
   216 	you can nest them as deep as you want, as long as each lock call
   217 	has a matching unlock call.  The surface remains locked until the
   218 	last matching unlock call.
   219 
   220 	Note that you may not blit to or from a locked surface.
   221 
   222 1.1.7:
   223 	The SDL_SetGammaRamp() and SDL_GetGammaRamp() functions now take
   224 	arrays of Uint16 values instead of Uint8 values.  For the most part,
   225 	you can just take your old values and shift them up 8 bits to get
   226 	new correct values for your gamma ramps.
   227 
   228 	You can pass SDL_RLEACCEL in flags passed to SDL_ConvertSurface()
   229         and SDL will try to RLE accelerate colorkey and alpha blits in the
   230 	resulting surface.
   231 
   232 1.1.6:
   233 	Added a function to return the thread ID of a specific thread:
   234 		Uint32 SDL_GetThreadID(SDL_Thread *thread)
   235 	If 'thread' is NULL, this function returns the id for this thread.
   236 
   237 1.1.5:
   238 	The YUV overlay structure has been changed to use an array of
   239 	pitches and pixels representing the planes of a YUV image, to
   240 	better enable hardware acceleration.  The YV12 and IYUV formats
   241 	each have three planes, corresponding to the Y, U, and V portions
   242 	of the image, while packed pixel YUV formats just have one plane.
   243 
   244 	For palettized mode (8bpp), the screen colormap is now split in
   245 	a physical and a logical palette. The physical palette determines
   246 	what colours the screen pixels will get when displayed, and the
   247 	logical palette controls the mapping from blits to/from the screen.
   248 	A new function, SDL_SetPalette() has been added to change
   249 	logical and physical palettes separately. SDL_SetColors() works
   250 	just as before, and is equivalent to calling SDL_SetPalette() with
   251 	a flag argument of (SDL_LOGPAL|SDL_PHYSPAL).
   252 
   253 	SDL_BlitSurface() no longer modifies the source rectangle, only the
   254 	destination rectangle. The width/height members of the destination
   255 	rectangle are ignored, only the position is used.
   256 
   257 	The old source clipping function SDL_SetClipping() has been replaced
   258 	with a more useful function to set the destination clipping rectangle:
   259 		SDL_bool SDL_SetClipRect(SDL_Surface *surface, SDL_Rect *rect)
   260 		
   261 	Added a function to see what subsystems have been initialized:
   262 		Uint32 SDL_WasInit(Uint32 flags)
   263 
   264 	The Big Alpha Flip: SDL now treats alpha as opacity like everybody
   265 	else, and not as transparency:
   266 
   267 	A new cpp symbol: SDL_ALPHA_OPAQUE is defined as 255
   268 	A new cpp symbol: SDL_ALPHA_TRANSPARENT is defined as 0
   269 	Values between 0 and 255 vary from fully transparent to fully opaque.
   270 
   271 	New functions:
   272 	SDL_DisplayFormatAlpha()
   273 	    Returns a surface converted to a format with alpha-channel
   274 	    that can be blit efficiently to the screen. (In other words,
   275 	    like SDL_DisplayFormat() but the resulting surface has
   276 	    an alpha channel.)  This is useful for surfaces with alpha.
   277 	SDL_MapRGBA()
   278 	    Works as SDL_MapRGB() but takes an additional alpha parameter.
   279 	SDL_GetRGBA()
   280 	    Works as SDL_GetRGB() but also returns the alpha value
   281 	    (SDL_ALPHA_OPAQUE for formats without an alpha channel)
   282 
   283 	Both SDL_GetRGB() and SDL_GetRGBA() now always return values in
   284 	the [0..255] interval. Previously, SDL_GetRGB() would return
   285 	(0xf8, 0xfc, 0xf8) for a completely white pixel in RGB565 format.
   286 	(N.B.: This is broken for bit fields < 3 bits.)
   287 
   288 	SDL_MapRGB() returns pixels in which the alpha channel is set opaque.
   289 
   290 	SDL_SetAlpha() can now be used for both setting the per-surface
   291 	alpha, using the new way of thinking of alpha, and also to enable
   292 	and disable per-pixel alpha blending for surfaces with an alpha
   293 	channel:
   294 		To disable alpha blending:
   295 			SDL_SetAlpha(surface, 0, 0);
   296 		To re-enable alpha blending:
   297 			SDL_SetAlpha(surface, SDL_SRCALPHA, 0);
   298 	Surfaces with an alpha channel have blending enabled by default.
   299 
   300 	SDL_SetAlpha() now accepts SDL_RLEACCEL as a flag, which requests
   301 	RLE acceleration of blits, just as like with SDL_SetColorKey().
   302 	This flag can be set for both surfaces with an alpha channel
   303 	and surfaces with an alpha value set by SDL_SetAlpha().
   304 	As always, RLE surfaces must be locked before pixel access is
   305 	allowed, and unlocked before any other SDL operations are done
   306 	on it.
   307 
   308 	The blit semantics for surfaces with and without alpha and colorkey
   309 	have now been defined:
   310 
   311 	RGBA->RGB:
   312 	    SDL_SRCALPHA set:
   313 		alpha-blend (using alpha-channel).
   314 		SDL_SRCCOLORKEY ignored.
   315 	    SDL_SRCALPHA not set:
   316 		copy RGB.
   317 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   318 		RGB values of the source colour key, ignoring alpha in the
   319 		comparison.
   320 
   321 	RGB->RGBA:
   322 	    SDL_SRCALPHA set:
   323 		alpha-blend (using the source per-surface alpha value);
   324 		set destination alpha to opaque.
   325 	    SDL_SRCALPHA not set:
   326 		copy RGB, set destination alpha to opaque.
   327 	    both:
   328 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   329 		source colour key.
   330 
   331 	RGBA->RGBA:
   332 	    SDL_SRCALPHA set:
   333 		alpha-blend (using the source alpha channel) the RGB values;
   334 		leave destination alpha untouched. [Note: is this correct?]
   335 		SDL_SRCCOLORKEY ignored.
   336 	    SDL_SRCALPHA not set:
   337 		copy all of RGBA to the destination.
   338 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   339 		RGB values of the source colour key, ignoring alpha in the
   340 		comparison.
   341 
   342 	RGB->RGB: 
   343 	    SDL_SRCALPHA set:
   344 		alpha-blend (using the source per-surface alpha value).
   345 	    SDL_SRCALPHA not set:
   346 		copy RGB.
   347 	    both:
   348 		if SDL_SRCCOLORKEY set, only copy the pixels matching the
   349 		source colour key.
   350 
   351 	As a special case, blits from surfaces with per-surface alpha
   352 	value of 128 (50% transparency) are optimised and much faster
   353 	than other alpha values. This does not apply to surfaces with
   354 	alpha channels (per-pixel alpha).
   355 
   356 	New functions for manipulating the gamma of the display have
   357 	been added:
   358 		int SDL_SetGamma(float red, float green, float blue);
   359 		int SDL_SetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
   360 		int SDL_GetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
   361 	Gamma ramps are tables with 256 entries which map the screen color
   362 	components into actually displayed colors.  For an example of
   363 	implementing gamma correction and gamma fades, see test/testgamma.c
   364 	Gamma control is not supported on all hardware.
   365 
   366 1.1.4:
   367 	The size of the SDL_CDtrack structure changed from 8 to 12 bytes
   368 	as the size of the length member was extended to 32 bits.
   369 
   370         You can now use SDL for 2D blitting with a GL mode by passing the
   371 	SDL_OPENGLBLIT flag to SDL_SetVideoMode().  You can specify 16 or
   372 	32 bpp, and the data in the framebuffer is put into the GL scene
   373 	when you call SDL_UpdateRects(), and the scene will be visible
   374 	when you call SDL_GL_SwapBuffers().
   375 
   376 	Run the "testgl" test program with the -logo command line option
   377 	to see an example of this blending of 2D and 3D in SDL.
   378 
   379 1.1.3:
   380 	Added SDL_FreeRW() to the API, to complement SDL_AllocRW()
   381 
   382 	Added resizable window support - just add SDL_RESIZABLE to the
   383 	SDL_SetVideoMode() flags, and then wait for SDL_VIDEORESIZE events.
   384 	See SDL_events.h for details on the new SDL_ResizeEvent structure.
   385 
   386 	Added condition variable support, based on mutexes and semaphores.
   387 		SDL_CreateCond()
   388 		SDL_DestroyCond()
   389 		SDL_CondSignal()
   390 		SDL_CondBroadcast()
   391 		SDL_CondWait()
   392 		SDL_CondTimedWait()
   393 	The new function prototypes are in SDL_mutex.h
   394 
   395 	Added counting semaphore support, based on the mutex primitive.
   396 		SDL_CreateSemaphore()
   397 		SDL_DestroySemaphore()
   398 		SDL_SemWait()
   399 		SDL_SemTryWait()
   400 		SDL_SemWaitTimeout()
   401 		SDL_SemPost()
   402 		SDL_SemValue()
   403 	The new function prototypes are in SDL_mutex.h
   404 
   405 	Added support for asynchronous blitting.  To take advantage of this,
   406 	you must set the SDL_ASYNCBLIT flag when setting the video mode and
   407 	creating surfaces that you want accelerated in this way.  You must
   408 	lock surfaces that have this flag set, and the lock will block until
   409 	any queued blits have completed.
   410 
   411 	Added YUV video overlay support.
   412 	The supported YUV formats are: YV12, IYUV, YUY2, UYVY, and YVYU.
   413 	This function creates an overlay surface:
   414 		SDL_CreateYUVOverlay()
   415 	You must lock and unlock the overlay to get access to the data:
   416 		SDL_LockYUVOverlay() SDL_UnlockYUVOverlay()
   417 	You can then display the overlay:
   418 		SDL_DisplayYUVOverlay()
   419 	You must free the overlay when you are done using it:
   420 		SDL_FreeYUVOverlay()
   421 	See SDL_video.h for the full function prototypes.
   422 
   423 	The joystick hat position constants have been changed:
   424 	Old constant            New constant
   425 	------------            ------------
   426 	     0                  SDL_HAT_CENTERED
   427 	     1                  SDL_HAT_UP
   428 	     2                  SDL_HAT_RIGHTUP
   429 	     3                  SDL_HAT_RIGHT
   430 	     4                  SDL_HAT_RIGHTDOWN
   431 	     5                  SDL_HAT_DOWN
   432 	     6                  SDL_HAT_LEFTDOWN
   433 	     7                  SDL_HAT_LEFT
   434 	     8                  SDL_HAT_LEFTUP
   435 	The new constants are bitmasks, so you can check for the
   436 	individual axes like this:
   437 		if ( hat_position & SDL_HAT_UP ) {
   438 		}
   439 	and you'll catch left-up, up, and right-up.
   440 
   441 1.1.2:
   442 	Added multiple timer support:
   443 		SDL_AddTimer() and SDL_RemoveTimer()
   444 
   445 	SDL_WM_SetIcon() now respects the icon colorkey if mask is NULL.
   446 
   447 1.1.0:
   448 	Added initial OpenGL support.
   449 	First set GL attributes (such as RGB depth, alpha depth, etc.)
   450 		SDL_GL_SetAttribute()
   451 	Then call SDL_SetVideoMode() with the SDL_OPENGL flag.
   452 	Perform all of your normal GL drawing.
   453 	Finally swap the buffers with the new SDL function:
   454 		SDL_GL_SwapBuffers()
   455 	See the new 'testgl' test program for an example of using GL with SDL.
   456 
   457 	You can load GL extension functions by using the function:
   458 		SDL_GL_LoadProcAddress()
   459 
   460 	Added functions to initialize and cleanup specific SDL subsystems:
   461 		SDL_InitSubSystem() and SDL_QuitSubSystem()
   462 
   463 	Added user-defined event type:
   464 		typedef struct {
   465         		Uint8 type;
   466         		int code;
   467         		void *data1;
   468         		void *data2;
   469 		} SDL_UserEvent;
   470 	This structure is in the "user" member of an SDL_Event.
   471 
   472 	Added a function to push events into the event queue:
   473 		SDL_PushEvent()
   474 
   475 	Example of using the new SDL user-defined events:
   476 	{
   477 		SDL_Event event;
   478 
   479 		event.type = SDL_USEREVENT;
   480 		event.user.code = my_event_code;
   481 		event.user.data1 = significant_data;
   482 		event.user.data2 = 0;
   483 		SDL_PushEvent(&event);
   484 	}
   485 
   486 	Added a function to get mouse deltas since last query:
   487 		SDL_GetRelativeMouseState()
   488 
   489 	Added a boolean datatype to SDL_types.h:
   490 		SDL_bool = { SDL_TRUE, SDL_FALSE }
   491 
   492 	Added a function to get the current audio status:
   493 		SDL_GetAudioState();
   494 	It returns one of:
   495 		SDL_AUDIO_STOPPED,
   496 		SDL_AUDIO_PLAYING,
   497 		SDL_AUDIO_PAUSED
   498 
   499 	Added an AAlib driver (ASCII Art) - by Stephane Peter.
   500 
   501 1.0.6:
   502 	The input grab state is reset after each call to SDL_SetVideoMode().
   503 	The input is grabbed by default in fullscreen mode, and ungrabbed in
   504 	windowed mode.  If you want to set input grab to a particular value,
   505 	you should set it after each call to SDL_SetVideoMode().
   506 
   507 1.0.5:
   508 	Exposed SDL_AudioInit(), SDL_VideoInit()
   509 	Added SDL_AudioDriverName() and SDL_VideoDriverName()
   510 
   511 	Added new window manager function:
   512 		SDL_WM_ToggleFullScreen()
   513 	This is currently implemented only on Linux
   514 
   515 	The ALT-ENTER code has been removed - it's not appropriate for a
   516 	lib to bind keys when they aren't even emergency escape sequences.
   517 
   518 	ALT-ENTER functionality can be implemented with the following code:
   519 
   520 	int Handle_AltEnter(const SDL_Event *event)
   521 	{
   522 	    if ( event->type == SDL_KEYDOWN ) {
   523 	        if ( (event->key.keysym.sym == SDLK_RETURN) &&
   524 	             (event->key.keysym.mod & KMOD_ALT) ) {   
   525 	                SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());
   526 	                return(0);
   527 	        }
   528 	    }
   529 	    return(1);
   530 	}
   531 	SDL_SetEventFilter(Handle_AltEnter);
   532 
   533 1.0.3:
   534 	Under X11, if you grab the input and hide the mouse cursor,
   535 	the mouse will go into a "relative motion" mode where you
   536 	will always get relative motion events no matter how far in
   537 	each direction you move the mouse - relative motion is not
   538 	bounded by the edges of the window (though the absolute values
   539 	of the mouse positions are clamped by the size of the window).
   540 	The SVGAlib, framebuffer console, and DirectInput drivers all
   541 	have this behavior naturally, and the GDI and BWindow drivers
   542 	never go into "relative motion" mode.
   543 
   544 1.0.2:
   545 	Added a function to enable keyboard repeat:
   546 		SDL_EnableKeyRepeat()
   547 
   548 	Added a function to grab the mouse and keyboard input
   549 		SDL_WM_GrabInput()
   550 
   551 	Added a function to iconify the window.
   552 		SDL_WM_IconifyWindow()
   553 	If this function succeeds, the application will receive an event
   554 	signaling SDL_APPACTIVE event 
   555 
   556 1.0.1:
   557 	Added constants to SDL_audio.h for 16-bit native byte ordering:
   558 		AUDIO_U16SYS, AUDIO_S16SYS
   559 
   560 1.0.0:
   561 	New public release
   562 
   563 Version 0.11:
   564 
   565 0.11.5:
   566 	A new function SDL_GetVideoSurface() has been added, and returns
   567 	a pointer to the current display surface.
   568 
   569 	SDL_AllocSurface() has been renamed SDL_CreateRGBSurface(), and
   570 	a new function SDL_CreateRGBSurfaceFrom() has been added to allow
   571 	creating an SDL surface from an existing pixel data buffer.
   572 
   573 	Added SDL_GetRGB() to the headers and documentation.
   574 
   575 0.11.4:
   576 	SDL_SetLibraryPath() is no longer meaningful, and has been removed.
   577 
   578 0.11.3:
   579 	A new flag for SDL_Init(), SDL_INIT_NOPARACHUTE, prevents SDL from
   580 	installing fatal signal handlers on operating systems that support
   581 	them.
   582 
   583 Version 0.9:
   584 
   585 0.9.15:
   586 	SDL_CreateColorCursor() has been removed.  Color cursors should
   587 	be implemented as sprites, blitted by the application when the
   588 	cursor moves.  To get smooth color cursor updates when the app
   589 	is busy, pass the SDL_INIT_EVENTTHREAD flag to SDL_Init().  This
   590 	allows you to handle the mouse motion in another thread from an
   591 	event filter function, but is currently only supported by Linux
   592 	and BeOS.  Note that you'll have to protect the display surface
   593 	from multi-threaded access by using mutexes if you do this.
   594 
   595 	Thread-safe surface support has been removed from SDL.
   596 	This makes blitting somewhat faster, by removing SDL_MiddleBlit().
   597 	Code that used SDL_MiddleBlit() should use SDL_LowerBlit() instead.
   598 	You can make your surfaces thread-safe by allocating your own
   599 	mutex and making lock/unlock calls around accesses to your surface.
   600 
   601 0.9.14:
   602 	SDL_GetMouseState() now takes pointers to int rather than Uint16.
   603 
   604 	If you set the SDL_WINDOWID environment variable under UNIX X11,
   605 	SDL will use that as the main window instead of creating it's own.
   606 	This is an unsupported extension to SDL, and not portable at all.
   607 
   608 0.9.13:
   609 	Added a function SDL_SetLibraryPath() which can be used to specify
   610 	the directory containing the SDL dynamic libraries.  This is useful
   611 	for commercial applications which ship with particular versions
   612 	of the libraries, and for security on multi-user systems.
   613 	If this function is not used, the default system directories are 
   614 	searched using the native dynamic object loading mechanism.
   615 
   616 	In order to support C linkage under Visual C++, you must declare
   617 	main() without any return type:
   618 		main(int argc, char *argv[]) {
   619 			/* Do the program... */
   620 			return(0);
   621 		}
   622 	C++ programs should also return a value if compiled under VC++.
   623 
   624 	The blit_endian member of the SDL_VideoInfo struct has been removed.
   625 
   626 	SDL_SymToASCII() has been replaced with SDL_GetKeyName(), so there
   627 	is now no longer any function to translate a keysym to a character.
   628 
   629 	The SDL_keysym structure has been extended with a 'scancode' and
   630 	'unicode' member.  The 'scancode' is a hardware specific scancode
   631 	for the key that was pressed, and may be 0.  The 'unicode' member
   632 	is a 16-bit UNICODE translation of the key that was pressed along
   633 	with any modifiers or compose keys that have been pressed.
   634 	If no UNICODE translation exists for the key, 'unicode' will be 0.
   635 
   636 	Added a function SDL_EnableUNICODE() to enable/disable UNICODE
   637 	translation of character keypresses.  Translation defaults off.
   638 
   639 	To convert existing code to use the new API, change code which
   640 	uses SDL_SymToASCII() to get the keyname to use SDL_GetKeyName(),
   641 	and change code which uses it to get the ASCII value of a sym to
   642 	use the 'unicode' member of the event keysym.
   643 
   644 0.9.12:
   645 	There is partial support for 64-bit datatypes.  I don't recommend 
   646 	you use this if you have a choice, because 64-bit datatypes are not
   647 	supported on many platforms.  On platforms for which it is supported,
   648 	the SDL_HAS_64BIT_TYPE C preprocessor define will be enabled, and
   649 	you can use the Uint64 and Sint64 datatypes.
   650 
   651 	Added functions to SDL_endian.h to support 64-bit datatypes:
   652 	    SDL_SwapLE64(), SDL_SwapBE64(),
   653 	    SDL_ReadLE64(), SDL_ReadBE64(), SDL_WriteLE64(), SDL_WriteBE64()
   654 
   655 	A new member "len_ratio" has been added to the SDL_AudioCVT structure,
   656 	and allows you to determine either the original buffer length or the
   657 	converted buffer length, given the other.
   658 
   659 	A new function SDL_FreeWAV() has been added to the API to free data
   660 	allocated by SDL_LoadWAV_RW().  This is necessary under Win32 since
   661 	the gcc compiled DLL uses a different heap than VC++ compiled apps.
   662 
   663 	SDL now has initial support for international keyboards using the
   664 	Latin character set.
   665 	If a particular mapping is desired, you can set the DEFAULT_KEYBOARD
   666 	compile-time variable, or you can set the environment variable 
   667 	"SDL_KEYBOARD" to a string identifying the keyboard mapping you desire.
   668 	The valid values for these variables can be found in SDL_keyboard.c
   669 
   670 	Full support for German and French keyboards under X11 is implemented.
   671 
   672 0.9.11:
   673 	The THREADED_EVENTS compile-time define has been replaced with the
   674 	SDL_INIT_EVENTTHREAD flag.  If this flag is passed to SDL_Init(),
   675 	SDL will create a separate thread to perform input event handling.
   676 	If this flag is passed to SDL_Init(), and the OS doesn't support 
   677 	event handling in a separate thread, SDL_Init() will fail.
   678 	Be sure to add calls to SDL_Delay() in your main thread to allow
   679 	the OS to schedule your event thread, or it may starve, leading
   680 	to slow event delivery and/or dropped events.
   681 	Currently MacOS and Win32 do not support this flag, while BeOS 
   682 	and Linux do support it.  I recommend that your application only
   683 	use this flag if absolutely necessary.
   684 
   685 	The SDL thread function passed to SDL_CreateThread() now returns a
   686 	status.  This status can be retrieved by passing a non-NULL pointer
   687 	as the 'status' argument to SDL_WaitThread().
   688 
   689 	The volume parameter to SDL_MixAudio() has been increased in range
   690 	from (0-8) to (0-128)
   691 
   692 	SDL now has a data source abstraction which can encompass a file,
   693 	an area of memory, or any custom object you can envision.  It uses
   694 	these abstractions, SDL_RWops, in the endian read/write functions,
   695 	and the built-in WAV and BMP file loaders.  This means you can load
   696 	WAV chunks from memory mapped files, compressed archives, network
   697 	pipes, or anything else that has a data read abstraction.
   698 
   699 	There are three built-in data source abstractions:
   700 	    SDL_RWFromFile(), SDL_RWFromFP(), SDL_RWFromMem()
   701 	along with a generic data source allocation function:
   702 	    SDL_AllocRW()
   703 	These data sources can be used like stdio file pointers with the
   704 	following convenience functions:
   705 	    SDL_RWseek(), SDL_RWread(), SDL_RWwrite(), SDL_RWclose()
   706 	These functions are defined in the new header file "SDL_rwops.h"
   707 
   708 	The endian swapping functions have been turned into macros for speed
   709 	and SDL_CalculateEndian() has been removed.  SDL_endian.h now defines
   710 	SDL_BYTEORDER as either SDL_BIG_ENDIAN or SDL_LIL_ENDIAN depending on
   711 	the endianness of the host system.
   712 
   713 	The endian read/write functions now take an SDL_RWops pointer
   714 	instead of a stdio FILE pointer, to support the new data source
   715 	abstraction.
   716 
   717 	The SDL_*LoadWAV() functions have been replaced with a single
   718 	SDL_LoadWAV_RW() function that takes a SDL_RWops pointer as it's
   719 	first parameter, and a flag whether or not to automatically 
   720 	free it as the second parameter.  SDL_LoadWAV() is a macro for
   721 	backward compatibility and convenience:
   722 	    SDL_LoadWAV_RW(SDL_RWFromFile("sample.wav", "rb"), 1, ...);
   723 
   724 	The SDL_*LoadBMP()/SDL_*SaveBMP() functions have each been replaced
   725 	with a single function that takes a SDL_RWops pointer as it's
   726 	first parameter, and a flag whether or not to automatically 
   727 	free it as the second parameter.  SDL_LoadBMP() and SDL_SaveBMP()
   728 	are macros for backward compatibility and convenience:
   729 	    SDL_LoadBMP_RW(SDL_RWFromFile("sample.bmp", "rb"), 1, ...);
   730 	    SDL_SaveBMP_RW(SDL_RWFromFile("sample.bmp", "wb"), 1, ...);
   731 	Note that these functions use SDL_RWseek() extensively, and should
   732 	not be used on pipes or other non-seekable data sources.
   733 
   734 0.9.10:
   735 	The Linux SDL_SysWMInfo and SDL_SysWMMsg structures have been 
   736 	extended to support multiple types of display drivers, as well as
   737         safe access to the X11 display when THREADED_EVENTS is enabled.
   738         The new structures are documented in the SDL_syswm.h header file.
   739 
   740 	Thanks to John Elliott <jce@seasip.demon.co.uk>, the UK keyboard
   741 	should now work properly, as well as the "Windows" keys on US
   742 	keyboards.
   743 
   744 	The Linux CD-ROM code now reads the CD-ROM devices from /etc/fstab
   745 	instead of trying to open each block device on the system.
   746 	The CD must be listed in /etc/fstab as using the iso9660 filesystem.
   747 
   748 	On Linux, if you define THREADED_EVENTS at compile time, a separate
   749 	thread will be spawned to gather X events asynchronously from the
   750 	graphics updates.  This hasn't been extensively tested, but it does
   751 	provide a means of handling keyboard and mouse input in a separate
   752 	thread from the graphics thread.  (This is now enabled by default.)
   753 
   754 	A special access function SDL_PeepEvents() allows you to manipulate
   755 	the event queue in a thread-safe manner, including peeking at events,
   756 	removing events of a specified type, and adding new events of arbitrary
   757 	type to the queue (use the new 'user' member of the SDL_Event type).
   758 
   759 	If you use SDL_PeepEvents() to gather events, then the main graphics
   760 	thread needs to call SDL_PumpEvents() periodically to drive the event
   761 	loop and generate input events.  This is not necessary if SDL has been 
   762 	compiled with THREADED_EVENTS defined, but doesn't hurt.
   763 
   764 	A new function SDL_ThreadID() returns the identifier associated with
   765 	the current thread.
   766 
   767 0.9.9:
   768 	The AUDIO_STEREO format flag has been replaced with a new 'channels'
   769 	member of the SDL_AudioSpec structure.  The channels are 1 for mono
   770 	audio, and 2 for stereo audio.  In the future more channels may be
   771 	supported for 3D surround sound.
   772 
   773 	The SDL_MixAudio() function now takes an additional volume parameter,
   774 	which should be set to SDL_MIX_MAXVOLUME for compatibility with the
   775 	original function.
   776 
   777 	The CD-ROM functions which take a 'cdrom' parameter can now be
   778 	passed NULL, and will act on the last successfully opened CD-ROM.
   779 
   780 0.9.8:
   781 	No changes, bugfixes only.
   782 	
   783 0.9.7:
   784 	No changes, bugfixes only.
   785 	
   786 0.9.6:
   787 	Added a fast rectangle fill function: SDL_FillRect()
   788 
   789 	Addition of a useful function for getting info on the video hardware:
   790 	    const SDL_VideoInfo *SDL_GetVideoInfo(void)
   791         This function replaces SDL_GetDisplayFormat().
   792 
   793 	Initial support for double-buffering:
   794 	  Use the SDL_DOUBLEBUF flag in SDL_SetVideoMode()
   795 	  Update the screen with a new function: SDL_Flip()
   796 
   797 	SDL_AllocSurface() takes two new flags:
   798 	SDL_SRCCOLORKEY means that the surface will be used for colorkey blits
   799 	  and if the hardware supports hardware acceleration of colorkey blits
   800 	  between two surfaces in video memory, to place the surface in video
   801 	  memory if possible, otherwise it will be placed in system memory.
   802 	SDL_SRCALPHA means that the surface will be used for alpha blits and
   803 	  if the hardware supports hardware acceleration of alpha blits between
   804 	  two surfaces in video memory, to place the surface in video memory
   805 	  if possible, otherwise it will be placed in system memory.
   806 	SDL_HWSURFACE now means that the surface will be created with the 
   807 	  same format as the display surface, since having surfaces in video
   808 	  memory is only useful for fast blitting to the screen, and you can't
   809 	  blit surfaces with different surface formats in video memory.
   810 
   811 0.9.5:
   812 	You can now pass a NULL mask to SDL_WM_SetIcon(), and it will assume
   813 	that the icon consists of the entire image.
   814 
   815 	SDL_LowerBlit() is back -- but don't use it on the display surface.
   816 	It is exactly the same as SDL_MiddleBlit(), but doesn't check for
   817 	thread safety.
   818 
   819 	Added SDL_FPLoadBMP(), SDL_FPSaveBMP(), SDL_FPLoadWAV(), which take
   820 	a FILE pointer instead of a file name.
   821 
   822 	Added CD-ROM audio control API:
   823 	    SDL_CDNumDrives()
   824 	    SDL_CDName()
   825 	    SDL_CDOpen()
   826 	    SDL_CDStatus()
   827 	    SDL_CDPlayTracks()
   828 	    SDL_CDPlay()
   829 	    SDL_CDPause()
   830 	    SDL_CDResume()
   831 	    SDL_CDStop()
   832 	    SDL_CDEject()
   833 	    SDL_CDClose()
   834 
   835 0.9.4:
   836 	No changes, bugfixes only.
   837 
   838 0.9.3:
   839 	Mouse motion event now includes relative motion information:
   840 	    Sint16 event->motion.xrel, Sint16 event->motion.yrel
   841 
   842 	X11 keyrepeat handling can be disabled by defining IGNORE_X_KEYREPEAT
   843 	    (Add -DIGNORE_X_KEYREPEAT to CFLAGS line in obj/x11Makefile)
   844 
   845 0.9.2:
   846 	No changes, bugfixes only.
   847 
   848 0.9.1:
   849 	Removed SDL_MapSurface() and SDL_UnmapSurface() -- surfaces are now
   850 	automatically mapped on blit.
   851 
   852 0.8.0:
   853 	SDL stable release