view BUGS @ 689:5bb080d35049

Date: Tue, 19 Aug 2003 17:57:00 +0200 From: Stephane Marchesin Subject: Re: [SDL] [patch] MMX alpha blit patches with MMX detection I think everything is correct now. I've done as much testing as I could, but some real-world testing wouldn't hurt, I think. The patch is here : http://icps.u-strasbg.fr/~marchesin/sdl_mmxblit.patch If you do byte-by-byte comparison of the output between C and MMX functions, you'll notice that the results for 555 and 565 RGB alpha blits aren't exactly the same. This is because MMX functions for 555 and 565 RGB have an higher accuracy. If you want the exact same behaviour that's possible by masking the three lower alpha bits in the MMX functions. Just ask ! I removed one MMX function because after I fixed it to match its C equivalent, it revealed to be slower than the C version on a PIII (although a bit faster on an Athlon XP). I've also added MMX and PIII replacements for SDL_memcpy. Those provide some speed up in testvidinfo -benchmark (at least for me, under linux & X11).
author Sam Lantinga <slouken@libsdl.org>
date Fri, 22 Aug 2003 05:51:19 +0000
parents 8bedd6d61642
children 04dd6c6d7c30
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All:
	Audio rate conversion is only implemented by multiplying or dividing
	by a power of two.  This is a side-effect of the requirement that the
	raw audio buffer size be a power of two, and can hopefully be fixed.
	This means 8 KHz audio converted to 22 KHz ends up being 16 KHz. :-/

	When the implementation is writing directly to video memory the mouse
	cursor doesn't work properly.  Applications which do this should use
	their own mouse cursor and call SDL_ShowCursor(0) to hide the system
	cursor.

Linux:
	Wide UNICODE character input (Kanji, etc.) is not yet supported.
	It requires handling of keyboard mapping events and using the XIM
	input translation extension.  I will implement it as requested.
	Latin-1 keyboard input works fine.

	The keyboard modifiers are not set to the correct state on startup.

	The AAlib, GGI, and SVGAlib video drivers are not heavily tested.

Win32:
	The MCI driver can't tell if the CD-ROM drive is paused or stopped.

	The SDL_INIT_EVENTTHREAD flag is not supported on Win32
	(Idea: create a separate DirectInput polling thread)
	The main purpose of this flag is for smooth cursor motion in
	fullscreen environments.

	Wide UNICODE character input (Kanji, etc.) is not yet supported.
	This requires the ToUnicode() API which is only implemented on
	Windows NT/2000, not on Windows 95/98.
	Latin-1 keyboard input works fine.

	Joysticks are only supported under the Win32 MultiMedia API,
	DirectInput support is not yet implemented.

BeOS:
	BePPC is not supported, apparently not even by Be Inc.

	SDL_WM_GrabInput() is not implemented.
	Does anyone know how to do this?  SDL_WM_GrabInput() is designed
	to prevent the user from switching input and mouse focus away from
	the SDL application.

	Continuous relative mouse motion is not implemented.

	Wide UNICODE character input (Kanji, etc.) has not been tested.
	Latin-1 keyboard input works fine.

MacOS:
	Palette handling isn't implemented in windowed mode yet.

	Audio hasn't been extensively tested, in particular the locking
	isn't implemented and mixer routines may not call malloc() or free()
	because they are called at interrupt time.

	SDL_WM_GrabInput() is not implemented.
	Does anyone know how to do this?  SDL_WM_GrabInput() is designed
	to prevent the user from switching input and mouse focus away from
	the SDL application.

	Continuous relative mouse motion is not implemented.

	SDL_AddTimer() and SDL_RemoveTimer() haven't been implemented yet.

	Not all of the keys are properly recognized on the keyboard.

MacOS X:
	CD-ROM functions are not implemented yet.

	Joystick code is not extensively tested yet.

	Resizeable windows aren't implemented yet.

	Depth switching for windowed mode isn't implemented yet.
	
	Palette handling isn't implemented in windowed mode yet.
	
	Command-line arguments dialog is not implemented yet.

	Fullscreen drawing has some artifacts.
	
	Fullscreen OpenGL for the software renderer is broken.

	Some OpenGL parameters are not accounted for, for example color bits customization.
	
	Continuous mouse motion perhaps is not as smooth as it should be.

	SDL_WM_GrabInput() is implemented, but it "freezes" the hardware
	cursor in the center of the window/screen.  Also, mouse moved events
	are not generated, and the keyboard cannot be grabbed.

	MacOS X seems to have a broken pthread_cancel() implementation.

FreeBSD:
	pthread_cancel() isn't supported by FreeBSD 3.X, so threads don't
	work on versions of FreeBSD earlier than 4.0.

	The CD-ROM handling doesn't work completely.

	Wide UNICODE character input (Kanji, etc.) is not yet supported.
	It requires handling of keyboard mapping events and using the XIM
	input translation extension.  I will implement it as requested.
	Latin-1 keyboard input works fine.

	The keyboard modifiers are not set to the correct state on startup.

Solaris:
	The joystick functions are not implemented yet.

	Wide UNICODE character input (Kanji, etc.) is not yet supported.
	It requires handling of keyboard mapping events and using the XIM
	input translation extension.  I will implement it as requested.
	Latin-1 keyboard input works fine.

	The keyboard modifiers are not set to the correct state on startup.

IRIX:
	The CD-ROM handling doesn't work completely.

	The joystick functions are not implemented yet.

	Wide UNICODE character input (Kanji, etc.) is not yet supported.
	It requires handling of keyboard mapping events and using the XIM
	input translation extension.  I will implement it as requested.
	Latin-1 keyboard input works fine.

	The keyboard modifiers are not set to the correct state on startup.

EPOC:
    Only Crystal version of Epoc/SymbianOS is currently supported.

    SDL is implemented in static library only. SDL uses static/global
    variables and that is not allowed in EPOC dll libraries.

    Sound is not yet supported.

    Joystick, OpenGL and cdrom is not supported (think about cdrom in a cell phone:-).
    
    No console output screen. Printing to stdout do not have any effect.

QNX:
	Fullscreen switch doesn't work correctly.
 

OpenBSD:  -= NOT YET SUPPORTED =-
	This is reported to work, but I haven't verified this.

	Wide UNICODE character input (Kanji, etc.) is not yet supported.
	It requires handling of keyboard mapping events and using the XIM
	input translation extension.  I will implement it as requested.
	Latin-1 keyboard input works fine.

	The keyboard modifiers are not set to the correct state on startup.

OSF/Tru64:  -= NOT YET SUPPORTED =-
	The audio functions are not implemented yet.

	Joysticks and CD-ROM functions are not implemented yet.

	Wide UNICODE character input (Kanji, etc.) is not yet supported.
	It requires handling of keyboard mapping events and using the XIM
	input translation extension.  I will implement it as requested.
	Latin-1 keyboard input works fine.

	The keyboard modifiers are not set to the correct state on startup.

AIX:  -= NOT YET SUPPORTED =-
	This port has only been tested with AIX 4.3.3

	The OpenGL support doesn't work yet.

	The joystick subsystem isn't implemented yet.

	Endian detection doesn't work yet - needs a unique CPP symbol.

	Wide UNICODE character input (Kanji, etc.) is not yet supported.
	It requires handling of keyboard mapping events and using the XIM
	input translation extension.  I will implement it as requested.
	Latin-1 keyboard input works fine.

	The keyboard modifiers are not set to the correct state on startup.

	The AIX port was done by Carsten.Griwodz@KOM.tu-darmstadt.de
	More information on this port is available at:
	http://www.kom.e-technik.tu-darmstadt.de/~griff/SDL/

AmigaOS:  -= NOT YET SUPPORTED =-
	The OpenGL support isn't implemented yet.

	SDL_WM_GrabInput() is not implemented.
	Does anyone know how to do this?  SDL_WM_GrabInput() is designed
	to prevent the user from switching input and mouse focus away from
	the SDL application.

	Continuous relative mouse motion is not implemented.

	The AmigaOS port was done by Gabriele.Greco@galactica.it