WhatsNew
author Sam Lantinga <slouken@libsdl.org>
Tue, 25 Jan 2005 16:57:11 +0000
changeset 1032 c1c2efca4548
parent 781 67176351a1b8
child 1507 1ff64ad478b2
permissions -rw-r--r--
Date: Mon, 24 Jan 2005 21:37:56 +0800
From: Chris Taylor
Subject: Patch to put back dynamic OpenGL loading for MPW

I sent a patch a while ago that removes dynamic OpenGL loading for
Macintosh Programmer's Workshop. Dynamic loading DOES actually work
when an SDL program is built with MPW, it just has to be set up for it.
(Whoops!!) This is the ideal way to get OpenGL extensions to work,
which D2X uses quite a few of.

This patch puts dynamic loading back in SDL for Mac OS 9. It applies to
current CVS. I noticed that two members need to be set when
DrawSprocket is used.
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This is a list of API changes in SDL's version history.
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Version 1.0:
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1.2.7:
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	Added CPU feature detection functions to SDL_cpuinfo.h:
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		SDL_HasRDTSC(), SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE(),
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		SDL_HasAltiVec()
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	Added function to create RWops from const memory: SDL_RWFromConstMem()
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1.2.6:
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	Added SDL_LoadObject(), SDL_LoadFunction(), and SDL_UnloadObject()
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	Added SDL_GL_MULTISAMPLEBUFFERS and SDL_GL_MULTISAMPLESAMPLES for FSAA
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1.2.5:
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	Added SDL_BUTTON_WHEELUP (4) and SDL_BUTTON_WHEELDOWN (5)
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	Added SDL_GL_STEREO for stereoscopic OpenGL contexts
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1.2.0:
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	Added SDL_VIDEOEXPOSE event to signal that the screen needs to
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	be redrawn.  This is currently only delivered to OpenGL windows
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	on X11, though it may be delivered in the future when the video
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	memory is lost under DirectX.
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1.1.8:
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	You can pass SDL_NOFRAME to SDL_VideoMode() to create a window
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	that has no title bar or frame decoration.  Fullscreen video
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	modes automatically have this flag set.
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	Added a function to query the clipping rectangle for a surface:
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		void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
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	Added a function to query the current event filter:
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		SDL_EventFilter SDL_GetEventFilter(void)
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	If you pass -1 to SDL_ShowCursor(), it won't change the current
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	cursor visibility state, but will still return it.
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	SDL_LockSurface() and SDL_UnlockSurface() are recursive, meaning
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	you can nest them as deep as you want, as long as each lock call
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	has a matching unlock call.  The surface remains locked until the
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	last matching unlock call.
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	Note that you may not blit to or from a locked surface.
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1.1.7:
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	The SDL_SetGammaRamp() and SDL_GetGammaRamp() functions now take
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	arrays of Uint16 values instead of Uint8 values.  For the most part,
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	you can just take your old values and shift them up 8 bits to get
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	new correct values for your gamma ramps.
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	You can pass SDL_RLEACCEL in flags passed to SDL_ConvertSurface()
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        and SDL will try to RLE accelerate colorkey and alpha blits in the
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	resulting surface.
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1.1.6:
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	Added a function to return the thread ID of a specific thread:
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		Uint32 SDL_GetThreadID(SDL_Thread *thread)
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	If 'thread' is NULL, this function returns the id for this thread.
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1.1.5:
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	The YUV overlay structure has been changed to use an array of
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	pitches and pixels representing the planes of a YUV image, to
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	better enable hardware acceleration.  The YV12 and IYUV formats
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	each have three planes, corresponding to the Y, U, and V portions
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	of the image, while packed pixel YUV formats just have one plane.
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	For palettized mode (8bpp), the screen colormap is now split in
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	a physical and a logical palette. The physical palette determines
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	what colours the screen pixels will get when displayed, and the
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	logical palette controls the mapping from blits to/from the screen.
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	A new function, SDL_SetPalette() has been added to change
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	logical and physical palettes separately. SDL_SetColors() works
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	just as before, and is equivalent to calling SDL_SetPalette() with
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	a flag argument of (SDL_LOGPAL|SDL_PHYSPAL).
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	SDL_BlitSurface() no longer modifies the source rectangle, only the
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	destination rectangle. The width/height members of the destination
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	rectangle are ignored, only the position is used.
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	The old source clipping function SDL_SetClipping() has been replaced
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	with a more useful function to set the destination clipping rectangle:
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		SDL_bool SDL_SetClipRect(SDL_Surface *surface, SDL_Rect *rect)
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	Added a function to see what subsystems have been initialized:
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		Uint32 SDL_WasInit(Uint32 flags)
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	The Big Alpha Flip: SDL now treats alpha as opacity like everybody
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	else, and not as transparency:
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	A new cpp symbol: SDL_ALPHA_OPAQUE is defined as 255
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	A new cpp symbol: SDL_ALPHA_TRANSPARENT is defined as 0
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	Values between 0 and 255 vary from fully transparent to fully opaque.
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	New functions:
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	SDL_DisplayFormatAlpha()
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	    Returns a surface converted to a format with alpha-channel
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	    that can be blit efficiently to the screen. (In other words,
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	    like SDL_DisplayFormat() but the resulting surface has
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	    an alpha channel.)  This is useful for surfaces with alpha.
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	SDL_MapRGBA()
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	    Works as SDL_MapRGB() but takes an additional alpha parameter.
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	SDL_GetRGBA()
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	    Works as SDL_GetRGB() but also returns the alpha value
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	    (SDL_ALPHA_OPAQUE for formats without an alpha channel)
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	Both SDL_GetRGB() and SDL_GetRGBA() now always return values in
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	the [0..255] interval. Previously, SDL_GetRGB() would return
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	(0xf8, 0xfc, 0xf8) for a completely white pixel in RGB565 format.
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	(N.B.: This is broken for bit fields < 3 bits.)
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	SDL_MapRGB() returns pixels in which the alpha channel is set opaque.
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	SDL_SetAlpha() can now be used for both setting the per-surface
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	alpha, using the new way of thinking of alpha, and also to enable
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	and disable per-pixel alpha blending for surfaces with an alpha
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	channel:
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		To disable alpha blending:
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			SDL_SetAlpha(surface, 0, 0);
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		To re-enable alpha blending:
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			SDL_SetAlpha(surface, SDL_SRCALPHA, 0);
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	Surfaces with an alpha channel have blending enabled by default.
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	SDL_SetAlpha() now accepts SDL_RLEACCEL as a flag, which requests
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	RLE acceleration of blits, just as like with SDL_SetColorKey().
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	This flag can be set for both surfaces with an alpha channel
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	and surfaces with an alpha value set by SDL_SetAlpha().
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	As always, RLE surfaces must be locked before pixel access is
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	allowed, and unlocked before any other SDL operations are done
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	on it.
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	The blit semantics for surfaces with and without alpha and colorkey
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	have now been defined:
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	RGBA->RGB:
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	    SDL_SRCALPHA set:
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		alpha-blend (using alpha-channel).
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		SDL_SRCCOLORKEY ignored.
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	    SDL_SRCALPHA not set:
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		copy RGB.
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		if SDL_SRCCOLORKEY set, only copy the pixels matching the
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		RGB values of the source colour key, ignoring alpha in the
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		comparison.
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	RGB->RGBA:
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	    SDL_SRCALPHA set:
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		alpha-blend (using the source per-surface alpha value);
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		set destination alpha to opaque.
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	    SDL_SRCALPHA not set:
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		copy RGB, set destination alpha to opaque.
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	    both:
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		if SDL_SRCCOLORKEY set, only copy the pixels matching the
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		source colour key.
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	RGBA->RGBA:
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	    SDL_SRCALPHA set:
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		alpha-blend (using the source alpha channel) the RGB values;
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		leave destination alpha untouched. [Note: is this correct?]
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		SDL_SRCCOLORKEY ignored.
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	    SDL_SRCALPHA not set:
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		copy all of RGBA to the destination.
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		if SDL_SRCCOLORKEY set, only copy the pixels matching the
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		RGB values of the source colour key, ignoring alpha in the
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		comparison.
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	RGB->RGB: 
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	    SDL_SRCALPHA set:
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		alpha-blend (using the source per-surface alpha value).
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	    SDL_SRCALPHA not set:
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		copy RGB.
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	    both:
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		if SDL_SRCCOLORKEY set, only copy the pixels matching the
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		source colour key.
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	As a special case, blits from surfaces with per-surface alpha
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	value of 128 (50% transparency) are optimised and much faster
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	than other alpha values. This does not apply to surfaces with
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	alpha channels (per-pixel alpha).
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	New functions for manipulating the gamma of the display have
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	been added:
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		int SDL_SetGamma(float red, float green, float blue);
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		int SDL_SetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
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		int SDL_GetGammaRamp(Uint8 *red, Uint8 *green, Uint8 *blue);
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	Gamma ramps are tables with 256 entries which map the screen color
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	components into actually displayed colors.  For an example of
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	implementing gamma correction and gamma fades, see test/testgamma.c
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	Gamma control is not supported on all hardware.
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1.1.4:
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	The size of the SDL_CDtrack structure changed from 8 to 12 bytes
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	as the size of the length member was extended to 32 bits.
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        You can now use SDL for 2D blitting with a GL mode by passing the
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	SDL_OPENGLBLIT flag to SDL_SetVideoMode().  You can specify 16 or
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	32 bpp, and the data in the framebuffer is put into the GL scene
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	when you call SDL_UpdateRects(), and the scene will be visible
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	when you call SDL_GL_SwapBuffers().
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	Run the "testgl" test program with the -logo command line option
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	to see an example of this blending of 2D and 3D in SDL.
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1.1.3:
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	Added SDL_FreeRW() to the API, to complement SDL_AllocRW()
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	Added resizable window support - just add SDL_RESIZABLE to the
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	SDL_SetVideoMode() flags, and then wait for SDL_VIDEORESIZE events.
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	See SDL_events.h for details on the new SDL_ResizeEvent structure.
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	Added condition variable support, based on mutexes and semaphores.
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		SDL_CreateCond()
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		SDL_DestroyCond()
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		SDL_CondSignal()
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		SDL_CondBroadcast()
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		SDL_CondWait()
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		SDL_CondTimedWait()
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	The new function prototypes are in SDL_mutex.h
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	Added counting semaphore support, based on the mutex primitive.
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		SDL_CreateSemaphore()
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		SDL_DestroySemaphore()
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		SDL_SemWait()
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		SDL_SemTryWait()
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		SDL_SemWaitTimeout()
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		SDL_SemPost()
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		SDL_SemValue()
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	The new function prototypes are in SDL_mutex.h
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	Added support for asynchronous blitting.  To take advantage of this,
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	you must set the SDL_ASYNCBLIT flag when setting the video mode and
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	creating surfaces that you want accelerated in this way.  You must
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	lock surfaces that have this flag set, and the lock will block until
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	any queued blits have completed.
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	Added YUV video overlay support.
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	The supported YUV formats are: YV12, IYUV, YUY2, UYVY, and YVYU.
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	This function creates an overlay surface:
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		SDL_CreateYUVOverlay()
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	You must lock and unlock the overlay to get access to the data:
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		SDL_LockYUVOverlay() SDL_UnlockYUVOverlay()
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	You can then display the overlay:
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		SDL_DisplayYUVOverlay()
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	You must free the overlay when you are done using it:
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		SDL_FreeYUVOverlay()
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	See SDL_video.h for the full function prototypes.
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	The joystick hat position constants have been changed:
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	Old constant            New constant
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	------------            ------------
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	     0                  SDL_HAT_CENTERED
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	     1                  SDL_HAT_UP
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	     2                  SDL_HAT_RIGHTUP
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	     3                  SDL_HAT_RIGHT
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	     4                  SDL_HAT_RIGHTDOWN
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	     5                  SDL_HAT_DOWN
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	     6                  SDL_HAT_LEFTDOWN
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	     7                  SDL_HAT_LEFT
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	     8                  SDL_HAT_LEFTUP
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	The new constants are bitmasks, so you can check for the
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	individual axes like this:
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		if ( hat_position & SDL_HAT_UP ) {
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		}
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	and you'll catch left-up, up, and right-up.
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1.1.2:
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	Added multiple timer support:
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		SDL_AddTimer() and SDL_RemoveTimer()
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	SDL_WM_SetIcon() now respects the icon colorkey if mask is NULL.
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1.1.0:
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	Added initial OpenGL support.
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	First set GL attributes (such as RGB depth, alpha depth, etc.)
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		SDL_GL_SetAttribute()
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	Then call SDL_SetVideoMode() with the SDL_OPENGL flag.
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	Perform all of your normal GL drawing.
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	Finally swap the buffers with the new SDL function:
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		SDL_GL_SwapBuffers()
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	See the new 'testgl' test program for an example of using GL with SDL.
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	You can load GL extension functions by using the function:
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		SDL_GL_LoadProcAddress()
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	Added functions to initialize and cleanup specific SDL subsystems:
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		SDL_InitSubSystem() and SDL_QuitSubSystem()
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	Added user-defined event type:
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		typedef struct {
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        		Uint8 type;
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        		int code;
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        		void *data1;
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        		void *data2;
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		} SDL_UserEvent;
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	This structure is in the "user" member of an SDL_Event.
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	Added a function to push events into the event queue:
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		SDL_PushEvent()
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	Example of using the new SDL user-defined events:
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	{
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		SDL_Event event;
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		event.type = SDL_USEREVENT;
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		event.user.code = my_event_code;
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		event.user.data1 = significant_data;
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		event.user.data2 = 0;
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		SDL_PushEvent(&event);
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	}
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	Added a function to get mouse deltas since last query:
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		SDL_GetRelativeMouseState()
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	Added a boolean datatype to SDL_types.h:
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		SDL_bool = { SDL_TRUE, SDL_FALSE }
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	Added a function to get the current audio status:
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		SDL_GetAudioState();
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	It returns one of:
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		SDL_AUDIO_STOPPED,
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		SDL_AUDIO_PLAYING,
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		SDL_AUDIO_PAUSED
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	Added an AAlib driver (ASCII Art) - by Stephane Peter.
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1.0.6:
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	The input grab state is reset after each call to SDL_SetVideoMode().
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	The input is grabbed by default in fullscreen mode, and ungrabbed in
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	windowed mode.  If you want to set input grab to a particular value,
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	you should set it after each call to SDL_SetVideoMode().
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1.0.5:
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	Exposed SDL_AudioInit(), SDL_VideoInit()
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	Added SDL_AudioDriverName() and SDL_VideoDriverName()
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	Added new window manager function:
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		SDL_WM_ToggleFullScreen()
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	This is currently implemented only on Linux
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	The ALT-ENTER code has been removed - it's not appropriate for a
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	lib to bind keys when they aren't even emergency escape sequences.
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	ALT-ENTER functionality can be implemented with the following code:
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	int Handle_AltEnter(const SDL_Event *event)
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	{
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	    if ( event->type == SDL_KEYDOWN ) {
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	        if ( (event->key.keysym.sym == SDLK_RETURN) &&
slouken@0
   351
	             (event->key.keysym.mod & KMOD_ALT) ) {   
slouken@0
   352
	                SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());
slouken@0
   353
	                return(0);
slouken@0
   354
	        }
slouken@0
   355
	    }
slouken@0
   356
	    return(1);
slouken@0
   357
	}
slouken@0
   358
	SDL_SetEventFilter(Handle_AltEnter);
slouken@0
   359
slouken@0
   360
1.0.3:
slouken@0
   361
	Under X11, if you grab the input and hide the mouse cursor,
slouken@0
   362
	the mouse will go into a "relative motion" mode where you
slouken@0
   363
	will always get relative motion events no matter how far in
slouken@0
   364
	each direction you move the mouse - relative motion is not
slouken@0
   365
	bounded by the edges of the window (though the absolute values
slouken@0
   366
	of the mouse positions are clamped by the size of the window).
slouken@0
   367
	The SVGAlib, framebuffer console, and DirectInput drivers all
slouken@0
   368
	have this behavior naturally, and the GDI and BWindow drivers
slouken@0
   369
	never go into "relative motion" mode.
slouken@0
   370
slouken@0
   371
1.0.2:
slouken@0
   372
	Added a function to enable keyboard repeat:
slouken@0
   373
		SDL_EnableKeyRepeat()
slouken@0
   374
slouken@0
   375
	Added a function to grab the mouse and keyboard input
slouken@0
   376
		SDL_WM_GrabInput()
slouken@0
   377
slouken@0
   378
	Added a function to iconify the window.
slouken@0
   379
		SDL_WM_IconifyWindow()
slouken@0
   380
	If this function succeeds, the application will receive an event
slouken@0
   381
	signaling SDL_APPACTIVE event 
slouken@0
   382
slouken@0
   383
1.0.1:
slouken@0
   384
	Added constants to SDL_audio.h for 16-bit native byte ordering:
slouken@0
   385
		AUDIO_U16SYS, AUDIO_S16SYS
slouken@0
   386
slouken@0
   387
1.0.0:
slouken@0
   388
	New public release
slouken@0
   389
slouken@0
   390
Version 0.11:
slouken@0
   391
slouken@0
   392
0.11.5:
slouken@0
   393
	A new function SDL_GetVideoSurface() has been added, and returns
slouken@0
   394
	a pointer to the current display surface.
slouken@0
   395
slouken@0
   396
	SDL_AllocSurface() has been renamed SDL_CreateRGBSurface(), and
slouken@0
   397
	a new function SDL_CreateRGBSurfaceFrom() has been added to allow
slouken@0
   398
	creating an SDL surface from an existing pixel data buffer.
slouken@0
   399
slouken@0
   400
	Added SDL_GetRGB() to the headers and documentation.
slouken@0
   401
slouken@0
   402
0.11.4:
slouken@0
   403
	SDL_SetLibraryPath() is no longer meaningful, and has been removed.
slouken@0
   404
slouken@0
   405
0.11.3:
slouken@0
   406
	A new flag for SDL_Init(), SDL_INIT_NOPARACHUTE, prevents SDL from
slouken@0
   407
	installing fatal signal handlers on operating systems that support
slouken@0
   408
	them.
slouken@0
   409
slouken@0
   410
Version 0.9:
slouken@0
   411
slouken@0
   412
0.9.15:
slouken@0
   413
	SDL_CreateColorCursor() has been removed.  Color cursors should
slouken@0
   414
	be implemented as sprites, blitted by the application when the
slouken@0
   415
	cursor moves.  To get smooth color cursor updates when the app
slouken@0
   416
	is busy, pass the SDL_INIT_EVENTTHREAD flag to SDL_Init().  This
slouken@0
   417
	allows you to handle the mouse motion in another thread from an
slouken@0
   418
	event filter function, but is currently only supported by Linux
slouken@0
   419
	and BeOS.  Note that you'll have to protect the display surface
slouken@0
   420
	from multi-threaded access by using mutexes if you do this.
slouken@0
   421
slouken@0
   422
	Thread-safe surface support has been removed from SDL.
slouken@0
   423
	This makes blitting somewhat faster, by removing SDL_MiddleBlit().
slouken@0
   424
	Code that used SDL_MiddleBlit() should use SDL_LowerBlit() instead.
slouken@0
   425
	You can make your surfaces thread-safe by allocating your own
slouken@0
   426
	mutex and making lock/unlock calls around accesses to your surface.
slouken@0
   427
slouken@0
   428
0.9.14:
slouken@0
   429
	SDL_GetMouseState() now takes pointers to int rather than Uint16.
slouken@0
   430
slouken@0
   431
	If you set the SDL_WINDOWID environment variable under UNIX X11,
slouken@0
   432
	SDL will use that as the main window instead of creating it's own.
slouken@0
   433
	This is an unsupported extension to SDL, and not portable at all.
slouken@0
   434
slouken@0
   435
0.9.13:
slouken@0
   436
	Added a function SDL_SetLibraryPath() which can be used to specify
slouken@0
   437
	the directory containing the SDL dynamic libraries.  This is useful
slouken@0
   438
	for commercial applications which ship with particular versions
slouken@0
   439
	of the libraries, and for security on multi-user systems.
slouken@0
   440
	If this function is not used, the default system directories are 
slouken@0
   441
	searched using the native dynamic object loading mechanism.
slouken@0
   442
slouken@0
   443
	In order to support C linkage under Visual C++, you must declare
slouken@0
   444
	main() without any return type:
slouken@0
   445
		main(int argc, char *argv[]) {
slouken@0
   446
			/* Do the program... */
slouken@0
   447
			return(0);
slouken@0
   448
		}
slouken@0
   449
	C++ programs should also return a value if compiled under VC++.
slouken@0
   450
slouken@0
   451
	The blit_endian member of the SDL_VideoInfo struct has been removed.
slouken@0
   452
slouken@0
   453
	SDL_SymToASCII() has been replaced with SDL_GetKeyName(), so there
slouken@0
   454
	is now no longer any function to translate a keysym to a character.
slouken@0
   455
slouken@0
   456
	The SDL_keysym structure has been extended with a 'scancode' and
slouken@0
   457
	'unicode' member.  The 'scancode' is a hardware specific scancode
slouken@0
   458
	for the key that was pressed, and may be 0.  The 'unicode' member
slouken@0
   459
	is a 16-bit UNICODE translation of the key that was pressed along
slouken@0
   460
	with any modifiers or compose keys that have been pressed.
slouken@0
   461
	If no UNICODE translation exists for the key, 'unicode' will be 0.
slouken@0
   462
slouken@0
   463
	Added a function SDL_EnableUNICODE() to enable/disable UNICODE
slouken@0
   464
	translation of character keypresses.  Translation defaults off.
slouken@0
   465
slouken@0
   466
	To convert existing code to use the new API, change code which
slouken@0
   467
	uses SDL_SymToASCII() to get the keyname to use SDL_GetKeyName(),
slouken@0
   468
	and change code which uses it to get the ASCII value of a sym to
slouken@0
   469
	use the 'unicode' member of the event keysym.
slouken@0
   470
slouken@0
   471
0.9.12:
slouken@0
   472
	There is partial support for 64-bit datatypes.  I don't recommend 
slouken@0
   473
	you use this if you have a choice, because 64-bit datatypes are not
slouken@0
   474
	supported on many platforms.  On platforms for which it is supported,
slouken@0
   475
	the SDL_HAS_64BIT_TYPE C preprocessor define will be enabled, and
slouken@0
   476
	you can use the Uint64 and Sint64 datatypes.
slouken@0
   477
slouken@0
   478
	Added functions to SDL_endian.h to support 64-bit datatypes:
slouken@0
   479
	    SDL_SwapLE64(), SDL_SwapBE64(),
slouken@0
   480
	    SDL_ReadLE64(), SDL_ReadBE64(), SDL_WriteLE64(), SDL_WriteBE64()
slouken@0
   481
slouken@0
   482
	A new member "len_ratio" has been added to the SDL_AudioCVT structure,
slouken@0
   483
	and allows you to determine either the original buffer length or the
slouken@0
   484
	converted buffer length, given the other.
slouken@0
   485
slouken@0
   486
	A new function SDL_FreeWAV() has been added to the API to free data
slouken@0
   487
	allocated by SDL_LoadWAV_RW().  This is necessary under Win32 since
slouken@0
   488
	the gcc compiled DLL uses a different heap than VC++ compiled apps.
slouken@0
   489
slouken@0
   490
	SDL now has initial support for international keyboards using the
slouken@0
   491
	Latin character set.
slouken@0
   492
	If a particular mapping is desired, you can set the DEFAULT_KEYBOARD
slouken@0
   493
	compile-time variable, or you can set the environment variable 
slouken@0
   494
	"SDL_KEYBOARD" to a string identifying the keyboard mapping you desire.
slouken@0
   495
	The valid values for these variables can be found in SDL_keyboard.c
slouken@0
   496
slouken@0
   497
	Full support for German and French keyboards under X11 is implemented.
slouken@0
   498
slouken@0
   499
0.9.11:
slouken@0
   500
	The THREADED_EVENTS compile-time define has been replaced with the
slouken@0
   501
	SDL_INIT_EVENTTHREAD flag.  If this flag is passed to SDL_Init(),
slouken@0
   502
	SDL will create a separate thread to perform input event handling.
slouken@0
   503
	If this flag is passed to SDL_Init(), and the OS doesn't support 
slouken@0
   504
	event handling in a separate thread, SDL_Init() will fail.
slouken@0
   505
	Be sure to add calls to SDL_Delay() in your main thread to allow
slouken@0
   506
	the OS to schedule your event thread, or it may starve, leading
slouken@0
   507
	to slow event delivery and/or dropped events.
slouken@0
   508
	Currently MacOS and Win32 do not support this flag, while BeOS 
slouken@0
   509
	and Linux do support it.  I recommend that your application only
slouken@0
   510
	use this flag if absolutely necessary.
slouken@0
   511
slouken@0
   512
	The SDL thread function passed to SDL_CreateThread() now returns a
slouken@0
   513
	status.  This status can be retrieved by passing a non-NULL pointer
slouken@0
   514
	as the 'status' argument to SDL_WaitThread().
slouken@0
   515
slouken@0
   516
	The volume parameter to SDL_MixAudio() has been increased in range
slouken@0
   517
	from (0-8) to (0-128)
slouken@0
   518
slouken@0
   519
	SDL now has a data source abstraction which can encompass a file,
slouken@0
   520
	an area of memory, or any custom object you can envision.  It uses
slouken@0
   521
	these abstractions, SDL_RWops, in the endian read/write functions,
slouken@0
   522
	and the built-in WAV and BMP file loaders.  This means you can load
slouken@0
   523
	WAV chunks from memory mapped files, compressed archives, network
slouken@0
   524
	pipes, or anything else that has a data read abstraction.
slouken@0
   525
slouken@0
   526
	There are three built-in data source abstractions:
slouken@0
   527
	    SDL_RWFromFile(), SDL_RWFromFP(), SDL_RWFromMem()
slouken@0
   528
	along with a generic data source allocation function:
slouken@0
   529
	    SDL_AllocRW()
slouken@0
   530
	These data sources can be used like stdio file pointers with the
slouken@0
   531
	following convenience functions:
slouken@0
   532
	    SDL_RWseek(), SDL_RWread(), SDL_RWwrite(), SDL_RWclose()
slouken@0
   533
	These functions are defined in the new header file "SDL_rwops.h"
slouken@0
   534
slouken@0
   535
	The endian swapping functions have been turned into macros for speed
slouken@0
   536
	and SDL_CalculateEndian() has been removed.  SDL_endian.h now defines
slouken@0
   537
	SDL_BYTEORDER as either SDL_BIG_ENDIAN or SDL_LIL_ENDIAN depending on
slouken@0
   538
	the endianness of the host system.
slouken@0
   539
slouken@0
   540
	The endian read/write functions now take an SDL_RWops pointer
slouken@0
   541
	instead of a stdio FILE pointer, to support the new data source
slouken@0
   542
	abstraction.
slouken@0
   543
slouken@0
   544
	The SDL_*LoadWAV() functions have been replaced with a single
slouken@0
   545
	SDL_LoadWAV_RW() function that takes a SDL_RWops pointer as it's
slouken@0
   546
	first parameter, and a flag whether or not to automatically 
slouken@0
   547
	free it as the second parameter.  SDL_LoadWAV() is a macro for
slouken@0
   548
	backward compatibility and convenience:
slouken@0
   549
	    SDL_LoadWAV_RW(SDL_RWFromFile("sample.wav", "rb"), 1, ...);
slouken@0
   550
slouken@0
   551
	The SDL_*LoadBMP()/SDL_*SaveBMP() functions have each been replaced
slouken@0
   552
	with a single function that takes a SDL_RWops pointer as it's
slouken@0
   553
	first parameter, and a flag whether or not to automatically 
slouken@0
   554
	free it as the second parameter.  SDL_LoadBMP() and SDL_SaveBMP()
slouken@0
   555
	are macros for backward compatibility and convenience:
slouken@0
   556
	    SDL_LoadBMP_RW(SDL_RWFromFile("sample.bmp", "rb"), 1, ...);
slouken@0
   557
	    SDL_SaveBMP_RW(SDL_RWFromFile("sample.bmp", "wb"), 1, ...);
slouken@0
   558
	Note that these functions use SDL_RWseek() extensively, and should
slouken@0
   559
	not be used on pipes or other non-seekable data sources.
slouken@0
   560
slouken@0
   561
0.9.10:
slouken@0
   562
	The Linux SDL_SysWMInfo and SDL_SysWMMsg structures have been 
slouken@0
   563
	extended to support multiple types of display drivers, as well as
slouken@0
   564
        safe access to the X11 display when THREADED_EVENTS is enabled.
slouken@0
   565
        The new structures are documented in the SDL_syswm.h header file.
slouken@0
   566
slouken@0
   567
	Thanks to John Elliott <jce@seasip.demon.co.uk>, the UK keyboard
slouken@0
   568
	should now work properly, as well as the "Windows" keys on US
slouken@0
   569
	keyboards.
slouken@0
   570
slouken@0
   571
	The Linux CD-ROM code now reads the CD-ROM devices from /etc/fstab
slouken@0
   572
	instead of trying to open each block device on the system.
slouken@0
   573
	The CD must be listed in /etc/fstab as using the iso9660 filesystem.
slouken@0
   574
slouken@0
   575
	On Linux, if you define THREADED_EVENTS at compile time, a separate
slouken@0
   576
	thread will be spawned to gather X events asynchronously from the
slouken@0
   577
	graphics updates.  This hasn't been extensively tested, but it does
slouken@0
   578
	provide a means of handling keyboard and mouse input in a separate
slouken@0
   579
	thread from the graphics thread.  (This is now enabled by default.)
slouken@0
   580
slouken@0
   581
	A special access function SDL_PeepEvents() allows you to manipulate
slouken@0
   582
	the event queue in a thread-safe manner, including peeking at events,
slouken@0
   583
	removing events of a specified type, and adding new events of arbitrary
slouken@0
   584
	type to the queue (use the new 'user' member of the SDL_Event type).
slouken@0
   585
slouken@0
   586
	If you use SDL_PeepEvents() to gather events, then the main graphics
slouken@0
   587
	thread needs to call SDL_PumpEvents() periodically to drive the event
slouken@0
   588
	loop and generate input events.  This is not necessary if SDL has been 
slouken@0
   589
	compiled with THREADED_EVENTS defined, but doesn't hurt.
slouken@0
   590
slouken@0
   591
	A new function SDL_ThreadID() returns the identifier associated with
slouken@0
   592
	the current thread.
slouken@0
   593
slouken@0
   594
0.9.9:
slouken@0
   595
	The AUDIO_STEREO format flag has been replaced with a new 'channels'
slouken@0
   596
	member of the SDL_AudioSpec structure.  The channels are 1 for mono
slouken@0
   597
	audio, and 2 for stereo audio.  In the future more channels may be
slouken@0
   598
	supported for 3D surround sound.
slouken@0
   599
slouken@0
   600
	The SDL_MixAudio() function now takes an additional volume parameter,
slouken@0
   601
	which should be set to SDL_MIX_MAXVOLUME for compatibility with the
slouken@0
   602
	original function.
slouken@0
   603
slouken@0
   604
	The CD-ROM functions which take a 'cdrom' parameter can now be
slouken@0
   605
	passed NULL, and will act on the last successfully opened CD-ROM.
slouken@0
   606
slouken@0
   607
0.9.8:
slouken@0
   608
	No changes, bugfixes only.
slouken@0
   609
	
slouken@0
   610
0.9.7:
slouken@0
   611
	No changes, bugfixes only.
slouken@0
   612
	
slouken@0
   613
0.9.6:
slouken@0
   614
	Added a fast rectangle fill function: SDL_FillRect()
slouken@0
   615
slouken@0
   616
	Addition of a useful function for getting info on the video hardware:
slouken@0
   617
	    const SDL_VideoInfo *SDL_GetVideoInfo(void)
slouken@0
   618
        This function replaces SDL_GetDisplayFormat().
slouken@0
   619
slouken@0
   620
	Initial support for double-buffering:
slouken@0
   621
	  Use the SDL_DOUBLEBUF flag in SDL_SetVideoMode()
slouken@0
   622
	  Update the screen with a new function: SDL_Flip()
slouken@0
   623
slouken@0
   624
	SDL_AllocSurface() takes two new flags:
slouken@0
   625
	SDL_SRCCOLORKEY means that the surface will be used for colorkey blits
slouken@0
   626
	  and if the hardware supports hardware acceleration of colorkey blits
slouken@0
   627
	  between two surfaces in video memory, to place the surface in video
slouken@0
   628
	  memory if possible, otherwise it will be placed in system memory.
slouken@0
   629
	SDL_SRCALPHA means that the surface will be used for alpha blits and
slouken@0
   630
	  if the hardware supports hardware acceleration of alpha blits between
slouken@0
   631
	  two surfaces in video memory, to place the surface in video memory
slouken@0
   632
	  if possible, otherwise it will be placed in system memory.
slouken@0
   633
	SDL_HWSURFACE now means that the surface will be created with the 
slouken@0
   634
	  same format as the display surface, since having surfaces in video
slouken@0
   635
	  memory is only useful for fast blitting to the screen, and you can't
slouken@0
   636
	  blit surfaces with different surface formats in video memory.
slouken@0
   637
slouken@0
   638
0.9.5:
slouken@0
   639
	You can now pass a NULL mask to SDL_WM_SetIcon(), and it will assume
slouken@0
   640
	that the icon consists of the entire image.
slouken@0
   641
slouken@0
   642
	SDL_LowerBlit() is back -- but don't use it on the display surface.
slouken@0
   643
	It is exactly the same as SDL_MiddleBlit(), but doesn't check for
slouken@0
   644
	thread safety.
slouken@0
   645
slouken@0
   646
	Added SDL_FPLoadBMP(), SDL_FPSaveBMP(), SDL_FPLoadWAV(), which take
slouken@0
   647
	a FILE pointer instead of a file name.
slouken@0
   648
slouken@0
   649
	Added CD-ROM audio control API:
slouken@0
   650
	    SDL_CDNumDrives()
slouken@0
   651
	    SDL_CDName()
slouken@0
   652
	    SDL_CDOpen()
slouken@0
   653
	    SDL_CDStatus()
slouken@0
   654
	    SDL_CDPlayTracks()
slouken@0
   655
	    SDL_CDPlay()
slouken@0
   656
	    SDL_CDPause()
slouken@0
   657
	    SDL_CDResume()
slouken@0
   658
	    SDL_CDStop()
slouken@0
   659
	    SDL_CDEject()
slouken@0
   660
	    SDL_CDClose()
slouken@0
   661
slouken@0
   662
0.9.4:
slouken@0
   663
	No changes, bugfixes only.
slouken@0
   664
slouken@0
   665
0.9.3:
slouken@0
   666
	Mouse motion event now includes relative motion information:
slouken@0
   667
	    Sint16 event->motion.xrel, Sint16 event->motion.yrel
slouken@0
   668
slouken@0
   669
	X11 keyrepeat handling can be disabled by defining IGNORE_X_KEYREPEAT
slouken@0
   670
	    (Add -DIGNORE_X_KEYREPEAT to CFLAGS line in obj/x11Makefile)
slouken@0
   671
slouken@0
   672
0.9.2:
slouken@0
   673
	No changes, bugfixes only.
slouken@0
   674
slouken@0
   675
0.9.1:
slouken@0
   676
	Removed SDL_MapSurface() and SDL_UnmapSurface() -- surfaces are now
slouken@0
   677
	automatically mapped on blit.
slouken@0
   678
slouken@0
   679
0.8.0:
slouken@0
   680
	SDL stable release