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Revision 81 - (hide annotations)
Wed May 27 20:33:03 2009 UTC (10 years, 4 months ago) by Jede
File size: 27506 byte(s)
Ajouts des libs windows
1 Jede 81
2     This is a list of API changes in SDL's version history.
4     Version 1.0:
6     1.2.13:
7     Added SDL_BUTTON_X1 and SDL_BUTTON_X2 constants.
9     1.2.12:
10     Added SDL_VIDEO_ALLOW_SCREENSAVER to override SDL's disabling
11     of the screensaver on Mac OS X and X11.
13     1.2.10:
14     If SDL_OpenAudio() is passed zero for the desired format
15     fields, the following environment variables will be used
16     to fill them in:
21     If an environment variable is not specified, it will be set
22     to a reasonable default value.
24     Added support for the SDL_VIDEO_FULLSCREEN_HEAD environment
25     variable, currently supported on X11 Xinerama configurations.
27     Added SDL_GL_SWAP_CONTROL to wait for vsync in OpenGL applications.
29     Added SDL_GL_ACCELERATED_VISUAL to guarantee hardware acceleration.
31     Added current_w and current_h to the SDL_VideoInfo structure,
32     which is set to the desktop resolution during video intialization,
33     and then set to the current resolution when a video mode is set.
35     SDL_SetVideoMode() now accepts 0 for width or height and will use
36     the current video mode (or the desktop mode if no mode has been set.)
38     Added SDL_GetKeyRepeat()
40     Added SDL_config.h, with defaults for various build environments.
42     1.2.7:
43     Added CPU feature detection functions to SDL_cpuinfo.h:
44     SDL_HasRDTSC(), SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE(),
45     SDL_HasAltiVec()
46     Added function to create RWops from const memory: SDL_RWFromConstMem()
48     1.2.6:
49     Added SDL_LoadObject(), SDL_LoadFunction(), and SDL_UnloadObject()
53     1.2.5:
56     Added SDL_GL_STEREO for stereoscopic OpenGL contexts
58     1.2.0:
59     Added SDL_VIDEOEXPOSE event to signal that the screen needs to
60     be redrawn. This is currently only delivered to OpenGL windows
61     on X11, though it may be delivered in the future when the video
62     memory is lost under DirectX.
64     1.1.8:
65     You can pass SDL_NOFRAME to SDL_VideoMode() to create a window
66     that has no title bar or frame decoration. Fullscreen video
67     modes automatically have this flag set.
69     Added a function to query the clipping rectangle for a surface:
70     void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
72     Added a function to query the current event filter:
73     SDL_EventFilter SDL_GetEventFilter(void)
75     If you pass -1 to SDL_ShowCursor(), it won't change the current
76     cursor visibility state, but will still return it.
78     SDL_LockSurface() and SDL_UnlockSurface() are recursive, meaning
79     you can nest them as deep as you want, as long as each lock call
80     has a matching unlock call. The surface remains locked until the
81     last matching unlock call.
83     Note that you may not blit to or from a locked surface.
85     1.1.7:
86     The SDL_SetGammaRamp() and SDL_GetGammaRamp() functions now take
87     arrays of Uint16 values instead of Uint8 values. For the most part,
88     you can just take your old values and shift them up 8 bits to get
89     new correct values for your gamma ramps.
91     You can pass SDL_RLEACCEL in flags passed to SDL_ConvertSurface()
92     and SDL will try to RLE accelerate colorkey and alpha blits in the
93     resulting surface.
95     1.1.6:
96     Added a function to return the thread ID of a specific thread:
97     Uint32 SDL_GetThreadID(SDL_Thread *thread)
98     If 'thread' is NULL, this function returns the id for this thread.
100     1.1.5:
101     The YUV overlay structure has been changed to use an array of
102     pitches and pixels representing the planes of a YUV image, to
103     better enable hardware acceleration. The YV12 and IYUV formats
104     each have three planes, corresponding to the Y, U, and V portions
105     of the image, while packed pixel YUV formats just have one plane.
107     For palettized mode (8bpp), the screen colormap is now split in
108     a physical and a logical palette. The physical palette determines
109     what colours the screen pixels will get when displayed, and the
110     logical palette controls the mapping from blits to/from the screen.
111     A new function, SDL_SetPalette() has been added to change
112     logical and physical palettes separately. SDL_SetColors() works
113     just as before, and is equivalent to calling SDL_SetPalette() with
114     a flag argument of (SDL_LOGPAL|SDL_PHYSPAL).
116     SDL_BlitSurface() no longer modifies the source rectangle, only the
117     destination rectangle. The width/height members of the destination
118     rectangle are ignored, only the position is used.
120     The old source clipping function SDL_SetClipping() has been replaced
121     with a more useful function to set the destination clipping rectangle:
122     SDL_bool SDL_SetClipRect(SDL_Surface *surface, SDL_Rect *rect)
124     Added a function to see what subsystems have been initialized:
125     Uint32 SDL_WasInit(Uint32 flags)
127     The Big Alpha Flip: SDL now treats alpha as opacity like everybody
128     else, and not as transparency:
130     A new cpp symbol: SDL_ALPHA_OPAQUE is defined as 255
131     A new cpp symbol: SDL_ALPHA_TRANSPARENT is defined as 0
132     Values between 0 and 255 vary from fully transparent to fully opaque.
134     New functions:
135     SDL_DisplayFormatAlpha()
136     Returns a surface converted to a format with alpha-channel
137     that can be blit efficiently to the screen. (In other words,
138     like SDL_DisplayFormat() but the resulting surface has
139     an alpha channel.) This is useful for surfaces with alpha.
140     SDL_MapRGBA()
141     Works as SDL_MapRGB() but takes an additional alpha parameter.
142     SDL_GetRGBA()
143     Works as SDL_GetRGB() but also returns the alpha value
144     (SDL_ALPHA_OPAQUE for formats without an alpha channel)
146     Both SDL_GetRGB() and SDL_GetRGBA() now always return values in
147     the [0..255] interval. Previously, SDL_GetRGB() would return
148     (0xf8, 0xfc, 0xf8) for a completely white pixel in RGB565 format.
149     (N.B.: This is broken for bit fields < 3 bits.)
151     SDL_MapRGB() returns pixels in which the alpha channel is set opaque.
153     SDL_SetAlpha() can now be used for both setting the per-surface
154     alpha, using the new way of thinking of alpha, and also to enable
155     and disable per-pixel alpha blending for surfaces with an alpha
156     channel:
157     To disable alpha blending:
158     SDL_SetAlpha(surface, 0, 0);
159     To re-enable alpha blending:
160     SDL_SetAlpha(surface, SDL_SRCALPHA, 0);
161     Surfaces with an alpha channel have blending enabled by default.
163     SDL_SetAlpha() now accepts SDL_RLEACCEL as a flag, which requests
164     RLE acceleration of blits, just as like with SDL_SetColorKey().
165     This flag can be set for both surfaces with an alpha channel
166     and surfaces with an alpha value set by SDL_SetAlpha().
167     As always, RLE surfaces must be locked before pixel access is
168     allowed, and unlocked before any other SDL operations are done
169     on it.
171     The blit semantics for surfaces with and without alpha and colorkey
172     have now been defined:
174     RGBA->RGB:
175     SDL_SRCALPHA set:
176     alpha-blend (using alpha-channel).
177     SDL_SRCCOLORKEY ignored.
178     SDL_SRCALPHA not set:
179     copy RGB.
180     if SDL_SRCCOLORKEY set, only copy the pixels matching the
181     RGB values of the source colour key, ignoring alpha in the
182     comparison.
184     RGB->RGBA:
185     SDL_SRCALPHA set:
186     alpha-blend (using the source per-surface alpha value);
187     set destination alpha to opaque.
188     SDL_SRCALPHA not set:
189     copy RGB, set destination alpha to opaque.
190     both:
191     if SDL_SRCCOLORKEY set, only copy the pixels matching the
192     source colour key.
194     RGBA->RGBA:
195     SDL_SRCALPHA set:
196     alpha-blend (using the source alpha channel) the RGB values;
197     leave destination alpha untouched. [Note: is this correct?]
198     SDL_SRCCOLORKEY ignored.
199     SDL_SRCALPHA not set:
200     copy all of RGBA to the destination.
201     if SDL_SRCCOLORKEY set, only copy the pixels matching the
202     RGB values of the source colour key, ignoring alpha in the
203     comparison.
205     RGB->RGB:
206     SDL_SRCALPHA set:
207     alpha-blend (using the source per-surface alpha value).
208     SDL_SRCALPHA not set:
209     copy RGB.
210     both:
211     if SDL_SRCCOLORKEY set, only copy the pixels matching the
212     source colour key.
214     As a special case, blits from surfaces with per-surface alpha
215     value of 128 (50% transparency) are optimised and much faster
216     than other alpha values. This does not apply to surfaces with
217     alpha channels (per-pixel alpha).
219     New functions for manipulating the gamma of the display have
220     been added:
221     int SDL_SetGamma(float red, float green, float blue);
222     int SDL_SetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
223     int SDL_GetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
224     Gamma ramps are tables with 256 entries which map the screen color
225     components into actually displayed colors. For an example of
226     implementing gamma correction and gamma fades, see test/testgamma.c
227     Gamma control is not supported on all hardware.
229     1.1.4:
230     The size of the SDL_CDtrack structure changed from 8 to 12 bytes
231     as the size of the length member was extended to 32 bits.
233     You can now use SDL for 2D blitting with a GL mode by passing the
234     SDL_OPENGLBLIT flag to SDL_SetVideoMode(). You can specify 16 or
235     32 bpp, and the data in the framebuffer is put into the GL scene
236     when you call SDL_UpdateRects(), and the scene will be visible
237     when you call SDL_GL_SwapBuffers().
239     Run the "testgl" test program with the -logo command line option
240     to see an example of this blending of 2D and 3D in SDL.
242     1.1.3:
243     Added SDL_FreeRW() to the API, to complement SDL_AllocRW()
245     Added resizable window support - just add SDL_RESIZABLE to the
246     SDL_SetVideoMode() flags, and then wait for SDL_VIDEORESIZE events.
247     See SDL_events.h for details on the new SDL_ResizeEvent structure.
249     Added condition variable support, based on mutexes and semaphores.
250     SDL_CreateCond()
251     SDL_DestroyCond()
252     SDL_CondSignal()
253     SDL_CondBroadcast()
254     SDL_CondWait()
255     SDL_CondTimedWait()
256     The new function prototypes are in SDL_mutex.h
258     Added counting semaphore support, based on the mutex primitive.
259     SDL_CreateSemaphore()
260     SDL_DestroySemaphore()
261     SDL_SemWait()
262     SDL_SemTryWait()
263     SDL_SemWaitTimeout()
264     SDL_SemPost()
265     SDL_SemValue()
266     The new function prototypes are in SDL_mutex.h
268     Added support for asynchronous blitting. To take advantage of this,
269     you must set the SDL_ASYNCBLIT flag when setting the video mode and
270     creating surfaces that you want accelerated in this way. You must
271     lock surfaces that have this flag set, and the lock will block until
272     any queued blits have completed.
274     Added YUV video overlay support.
275     The supported YUV formats are: YV12, IYUV, YUY2, UYVY, and YVYU.
276     This function creates an overlay surface:
277     SDL_CreateYUVOverlay()
278     You must lock and unlock the overlay to get access to the data:
279     SDL_LockYUVOverlay() SDL_UnlockYUVOverlay()
280     You can then display the overlay:
281     SDL_DisplayYUVOverlay()
282     You must free the overlay when you are done using it:
283     SDL_FreeYUVOverlay()
284     See SDL_video.h for the full function prototypes.
286     The joystick hat position constants have been changed:
287     Old constant New constant
288     ------------ ------------
290     1 SDL_HAT_UP
292     3 SDL_HAT_RIGHT
294     5 SDL_HAT_DOWN
296     7 SDL_HAT_LEFT
297     8 SDL_HAT_LEFTUP
298     The new constants are bitmasks, so you can check for the
299     individual axes like this:
300     if ( hat_position & SDL_HAT_UP ) {
301     }
302     and you'll catch left-up, up, and right-up.
304     1.1.2:
305     Added multiple timer support:
306     SDL_AddTimer() and SDL_RemoveTimer()
308     SDL_WM_SetIcon() now respects the icon colorkey if mask is NULL.
310     1.1.0:
311     Added initial OpenGL support.
312     First set GL attributes (such as RGB depth, alpha depth, etc.)
313     SDL_GL_SetAttribute()
314     Then call SDL_SetVideoMode() with the SDL_OPENGL flag.
315     Perform all of your normal GL drawing.
316     Finally swap the buffers with the new SDL function:
317     SDL_GL_SwapBuffers()
318     See the new 'testgl' test program for an example of using GL with SDL.
320     You can load GL extension functions by using the function:
321     SDL_GL_LoadProcAddress()
323     Added functions to initialize and cleanup specific SDL subsystems:
324     SDL_InitSubSystem() and SDL_QuitSubSystem()
326     Added user-defined event type:
327     typedef struct {
328     Uint8 type;
329     int code;
330     void *data1;
331     void *data2;
332     } SDL_UserEvent;
333     This structure is in the "user" member of an SDL_Event.
335     Added a function to push events into the event queue:
336     SDL_PushEvent()
338     Example of using the new SDL user-defined events:
339     {
340     SDL_Event event;
342     event.type = SDL_USEREVENT;
343     event.user.code = my_event_code;
344     event.user.data1 = significant_data;
345     event.user.data2 = 0;
346     SDL_PushEvent(&event);
347     }
349     Added a function to get mouse deltas since last query:
350     SDL_GetRelativeMouseState()
352     Added a boolean datatype to SDL_types.h:
353     SDL_bool = { SDL_TRUE, SDL_FALSE }
355     Added a function to get the current audio status:
356     SDL_GetAudioState();
357     It returns one of:
362     Added an AAlib driver (ASCII Art) - by Stephane Peter.
364     1.0.6:
365     The input grab state is reset after each call to SDL_SetVideoMode().
366     The input is grabbed by default in fullscreen mode, and ungrabbed in
367     windowed mode. If you want to set input grab to a particular value,
368     you should set it after each call to SDL_SetVideoMode().
370     1.0.5:
371     Exposed SDL_AudioInit(), SDL_VideoInit()
372     Added SDL_AudioDriverName() and SDL_VideoDriverName()
374     Added new window manager function:
375     SDL_WM_ToggleFullScreen()
376     This is currently implemented only on Linux
378     The ALT-ENTER code has been removed - it's not appropriate for a
379     lib to bind keys when they aren't even emergency escape sequences.
381     ALT-ENTER functionality can be implemented with the following code:
383     int Handle_AltEnter(const SDL_Event *event)
384     {
385     if ( event->type == SDL_KEYDOWN ) {
386     if ( (event->key.keysym.sym == SDLK_RETURN) &&
387     (event->key.keysym.mod & KMOD_ALT) ) {
388     SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());
389     return(0);
390     }
391     }
392     return(1);
393     }
394     SDL_SetEventFilter(Handle_AltEnter);
396     1.0.3:
397     Under X11, if you grab the input and hide the mouse cursor,
398     the mouse will go into a "relative motion" mode where you
399     will always get relative motion events no matter how far in
400     each direction you move the mouse - relative motion is not
401     bounded by the edges of the window (though the absolute values
402     of the mouse positions are clamped by the size of the window).
403     The SVGAlib, framebuffer console, and DirectInput drivers all
404     have this behavior naturally, and the GDI and BWindow drivers
405     never go into "relative motion" mode.
407     1.0.2:
408     Added a function to enable keyboard repeat:
409     SDL_EnableKeyRepeat()
411     Added a function to grab the mouse and keyboard input
412     SDL_WM_GrabInput()
414     Added a function to iconify the window.
415     SDL_WM_IconifyWindow()
416     If this function succeeds, the application will receive an event
417     signaling SDL_APPACTIVE event
419     1.0.1:
420     Added constants to SDL_audio.h for 16-bit native byte ordering:
423     1.0.0:
424     New public release
426     Version 0.11:
428     0.11.5:
429     A new function SDL_GetVideoSurface() has been added, and returns
430     a pointer to the current display surface.
432     SDL_AllocSurface() has been renamed SDL_CreateRGBSurface(), and
433     a new function SDL_CreateRGBSurfaceFrom() has been added to allow
434     creating an SDL surface from an existing pixel data buffer.
436     Added SDL_GetRGB() to the headers and documentation.
438     0.11.4:
439     SDL_SetLibraryPath() is no longer meaningful, and has been removed.
441     0.11.3:
442     A new flag for SDL_Init(), SDL_INIT_NOPARACHUTE, prevents SDL from
443     installing fatal signal handlers on operating systems that support
444     them.
446     Version 0.9:
448     0.9.15:
449     SDL_CreateColorCursor() has been removed. Color cursors should
450     be implemented as sprites, blitted by the application when the
451     cursor moves. To get smooth color cursor updates when the app
452     is busy, pass the SDL_INIT_EVENTTHREAD flag to SDL_Init(). This
453     allows you to handle the mouse motion in another thread from an
454     event filter function, but is currently only supported by Linux
455     and BeOS. Note that you'll have to protect the display surface
456     from multi-threaded access by using mutexes if you do this.
458     Thread-safe surface support has been removed from SDL.
459     This makes blitting somewhat faster, by removing SDL_MiddleBlit().
460     Code that used SDL_MiddleBlit() should use SDL_LowerBlit() instead.
461     You can make your surfaces thread-safe by allocating your own
462     mutex and making lock/unlock calls around accesses to your surface.
464     0.9.14:
465     SDL_GetMouseState() now takes pointers to int rather than Uint16.
467     If you set the SDL_WINDOWID environment variable under UNIX X11,
468     SDL will use that as the main window instead of creating it's own.
469     This is an unsupported extension to SDL, and not portable at all.
471     0.9.13:
472     Added a function SDL_SetLibraryPath() which can be used to specify
473     the directory containing the SDL dynamic libraries. This is useful
474     for commercial applications which ship with particular versions
475     of the libraries, and for security on multi-user systems.
476     If this function is not used, the default system directories are
477     searched using the native dynamic object loading mechanism.
479     In order to support C linkage under Visual C++, you must declare
480     main() without any return type:
481     main(int argc, char *argv[]) {
482     /* Do the program... */
483     return(0);
484     }
485     C++ programs should also return a value if compiled under VC++.
487     The blit_endian member of the SDL_VideoInfo struct has been removed.
489     SDL_SymToASCII() has been replaced with SDL_GetKeyName(), so there
490     is now no longer any function to translate a keysym to a character.
492     The SDL_keysym structure has been extended with a 'scancode' and
493     'unicode' member. The 'scancode' is a hardware specific scancode
494     for the key that was pressed, and may be 0. The 'unicode' member
495     is a 16-bit UNICODE translation of the key that was pressed along
496     with any modifiers or compose keys that have been pressed.
497     If no UNICODE translation exists for the key, 'unicode' will be 0.
499     Added a function SDL_EnableUNICODE() to enable/disable UNICODE
500     translation of character keypresses. Translation defaults off.
502     To convert existing code to use the new API, change code which
503     uses SDL_SymToASCII() to get the keyname to use SDL_GetKeyName(),
504     and change code which uses it to get the ASCII value of a sym to
505     use the 'unicode' member of the event keysym.
507     0.9.12:
508     There is partial support for 64-bit datatypes. I don't recommend
509     you use this if you have a choice, because 64-bit datatypes are not
510     supported on many platforms. On platforms for which it is supported,
511     the SDL_HAS_64BIT_TYPE C preprocessor define will be enabled, and
512     you can use the Uint64 and Sint64 datatypes.
514     Added functions to SDL_endian.h to support 64-bit datatypes:
515     SDL_SwapLE64(), SDL_SwapBE64(),
516     SDL_ReadLE64(), SDL_ReadBE64(), SDL_WriteLE64(), SDL_WriteBE64()
518     A new member "len_ratio" has been added to the SDL_AudioCVT structure,
519     and allows you to determine either the original buffer length or the
520     converted buffer length, given the other.
522     A new function SDL_FreeWAV() has been added to the API to free data
523     allocated by SDL_LoadWAV_RW(). This is necessary under Win32 since
524     the gcc compiled DLL uses a different heap than VC++ compiled apps.
526     SDL now has initial support for international keyboards using the
527     Latin character set.
528     If a particular mapping is desired, you can set the DEFAULT_KEYBOARD
529     compile-time variable, or you can set the environment variable
530     "SDL_KEYBOARD" to a string identifying the keyboard mapping you desire.
531     The valid values for these variables can be found in SDL_keyboard.c
533     Full support for German and French keyboards under X11 is implemented.
535     0.9.11:
536     The THREADED_EVENTS compile-time define has been replaced with the
537     SDL_INIT_EVENTTHREAD flag. If this flag is passed to SDL_Init(),
538     SDL will create a separate thread to perform input event handling.
539     If this flag is passed to SDL_Init(), and the OS doesn't support
540     event handling in a separate thread, SDL_Init() will fail.
541     Be sure to add calls to SDL_Delay() in your main thread to allow
542     the OS to schedule your event thread, or it may starve, leading
543     to slow event delivery and/or dropped events.
544     Currently MacOS and Win32 do not support this flag, while BeOS
545     and Linux do support it. I recommend that your application only
546     use this flag if absolutely necessary.
548     The SDL thread function passed to SDL_CreateThread() now returns a
549     status. This status can be retrieved by passing a non-NULL pointer
550     as the 'status' argument to SDL_WaitThread().
552     The volume parameter to SDL_MixAudio() has been increased in range
553     from (0-8) to (0-128)
555     SDL now has a data source abstraction which can encompass a file,
556     an area of memory, or any custom object you can envision. It uses
557     these abstractions, SDL_RWops, in the endian read/write functions,
558     and the built-in WAV and BMP file loaders. This means you can load
559     WAV chunks from memory mapped files, compressed archives, network
560     pipes, or anything else that has a data read abstraction.
562     There are three built-in data source abstractions:
563     SDL_RWFromFile(), SDL_RWFromFP(), SDL_RWFromMem()
564     along with a generic data source allocation function:
565     SDL_AllocRW()
566     These data sources can be used like stdio file pointers with the
567     following convenience functions:
568     SDL_RWseek(), SDL_RWread(), SDL_RWwrite(), SDL_RWclose()
569     These functions are defined in the new header file "SDL_rwops.h"
571     The endian swapping functions have been turned into macros for speed
572     and SDL_CalculateEndian() has been removed. SDL_endian.h now defines
573     SDL_BYTEORDER as either SDL_BIG_ENDIAN or SDL_LIL_ENDIAN depending on
574     the endianness of the host system.
576     The endian read/write functions now take an SDL_RWops pointer
577     instead of a stdio FILE pointer, to support the new data source
578     abstraction.
580     The SDL_*LoadWAV() functions have been replaced with a single
581     SDL_LoadWAV_RW() function that takes a SDL_RWops pointer as it's
582     first parameter, and a flag whether or not to automatically
583     free it as the second parameter. SDL_LoadWAV() is a macro for
584     backward compatibility and convenience:
585     SDL_LoadWAV_RW(SDL_RWFromFile("sample.wav", "rb"), 1, ...);
587     The SDL_*LoadBMP()/SDL_*SaveBMP() functions have each been replaced
588     with a single function that takes a SDL_RWops pointer as it's
589     first parameter, and a flag whether or not to automatically
590     free it as the second parameter. SDL_LoadBMP() and SDL_SaveBMP()
591     are macros for backward compatibility and convenience:
592     SDL_LoadBMP_RW(SDL_RWFromFile("sample.bmp", "rb"), 1, ...);
593     SDL_SaveBMP_RW(SDL_RWFromFile("sample.bmp", "wb"), 1, ...);
594     Note that these functions use SDL_RWseek() extensively, and should
595     not be used on pipes or other non-seekable data sources.
597     0.9.10:
598     The Linux SDL_SysWMInfo and SDL_SysWMMsg structures have been
599     extended to support multiple types of display drivers, as well as
600     safe access to the X11 display when THREADED_EVENTS is enabled.
601     The new structures are documented in the SDL_syswm.h header file.
603     Thanks to John Elliott <jce@seasip.demon.co.uk>, the UK keyboard
604     should now work properly, as well as the "Windows" keys on US
605     keyboards.
607     The Linux CD-ROM code now reads the CD-ROM devices from /etc/fstab
608     instead of trying to open each block device on the system.
609     The CD must be listed in /etc/fstab as using the iso9660 filesystem.
611     On Linux, if you define THREADED_EVENTS at compile time, a separate
612     thread will be spawned to gather X events asynchronously from the
613     graphics updates. This hasn't been extensively tested, but it does
614     provide a means of handling keyboard and mouse input in a separate
615     thread from the graphics thread. (This is now enabled by default.)
617     A special access function SDL_PeepEvents() allows you to manipulate
618     the event queue in a thread-safe manner, including peeking at events,
619     removing events of a specified type, and adding new events of arbitrary
620     type to the queue (use the new 'user' member of the SDL_Event type).
622     If you use SDL_PeepEvents() to gather events, then the main graphics
623     thread needs to call SDL_PumpEvents() periodically to drive the event
624     loop and generate input events. This is not necessary if SDL has been
625     compiled with THREADED_EVENTS defined, but doesn't hurt.
627     A new function SDL_ThreadID() returns the identifier associated with
628     the current thread.
630     0.9.9:
631     The AUDIO_STEREO format flag has been replaced with a new 'channels'
632     member of the SDL_AudioSpec structure. The channels are 1 for mono
633     audio, and 2 for stereo audio. In the future more channels may be
634     supported for 3D surround sound.
636     The SDL_MixAudio() function now takes an additional volume parameter,
637     which should be set to SDL_MIX_MAXVOLUME for compatibility with the
638     original function.
640     The CD-ROM functions which take a 'cdrom' parameter can now be
641     passed NULL, and will act on the last successfully opened CD-ROM.
643     0.9.8:
644     No changes, bugfixes only.
646     0.9.7:
647     No changes, bugfixes only.
649     0.9.6:
650     Added a fast rectangle fill function: SDL_FillRect()
652     Addition of a useful function for getting info on the video hardware:
653     const SDL_VideoInfo *SDL_GetVideoInfo(void)
654     This function replaces SDL_GetDisplayFormat().
656     Initial support for double-buffering:
657     Use the SDL_DOUBLEBUF flag in SDL_SetVideoMode()
658     Update the screen with a new function: SDL_Flip()
660     SDL_AllocSurface() takes two new flags:
661     SDL_SRCCOLORKEY means that the surface will be used for colorkey blits
662     and if the hardware supports hardware acceleration of colorkey blits
663     between two surfaces in video memory, to place the surface in video
664     memory if possible, otherwise it will be placed in system memory.
665     SDL_SRCALPHA means that the surface will be used for alpha blits and
666     if the hardware supports hardware acceleration of alpha blits between
667     two surfaces in video memory, to place the surface in video memory
668     if possible, otherwise it will be placed in system memory.
669     SDL_HWSURFACE now means that the surface will be created with the
670     same format as the display surface, since having surfaces in video
671     memory is only useful for fast blitting to the screen, and you can't
672     blit surfaces with different surface formats in video memory.
674     0.9.5:
675     You can now pass a NULL mask to SDL_WM_SetIcon(), and it will assume
676     that the icon consists of the entire image.
678     SDL_LowerBlit() is back -- but don't use it on the display surface.
679     It is exactly the same as SDL_MiddleBlit(), but doesn't check for
680     thread safety.
682     Added SDL_FPLoadBMP(), SDL_FPSaveBMP(), SDL_FPLoadWAV(), which take
683     a FILE pointer instead of a file name.
685     Added CD-ROM audio control API:
686     SDL_CDNumDrives()
687     SDL_CDName()
688     SDL_CDOpen()
689     SDL_CDStatus()
690     SDL_CDPlayTracks()
691     SDL_CDPlay()
692     SDL_CDPause()
693     SDL_CDResume()
694     SDL_CDStop()
695     SDL_CDEject()
696     SDL_CDClose()
698     0.9.4:
699     No changes, bugfixes only.
701     0.9.3:
702     Mouse motion event now includes relative motion information:
703     Sint16 event->motion.xrel, Sint16 event->motion.yrel
705     X11 keyrepeat handling can be disabled by defining IGNORE_X_KEYREPEAT
706     (Add -DIGNORE_X_KEYREPEAT to CFLAGS line in obj/x11Makefile)
708     0.9.2:
709     No changes, bugfixes only.
711     0.9.1:
712     Removed SDL_MapSurface() and SDL_UnmapSurface() -- surfaces are now
713     automatically mapped on blit.
715     0.8.0:
716     SDL stable release

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