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annotate README @ 3899:081aecdb0911 SDL-1.2

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From: Gabriel Gambetta To: SDL Mailing List <sdl@libsdl.org> Date: Fri, 17 Nov 2006 00:39:29 -0200 Subject: [SDL] Alpha blending bug - fixed? It turns out mm5 never got the correct value. This failed : [...] "movd %1, %%mm5\n\t" : : "m" (amask), "m" (sf->Ashift) ); mm5 got 0xFF000018 instead of 0x00000018. However I did this : Uint32 ashift = sf->Ashift; [...] "movd %1, %%mm5\n\t" : : "m" (amask), "m" (ashift) ); and everything worked fine. The only thing I could find out was that ashift is 32-bit aligned but sf->Ashift isn't: printf("ashift %8X [%d]\n", &ashift, (int)(&ashift) % 4); printf("sf->Ashift %8X [%d]\n", &sf->Ashift, (int)(&sf->Ashift) % 4); ashift at BFF0E0C4 [0] sf->Ashift at 08AFB9CD [1] Could this be the problem? If it is, the fix is extremely trivial. Should I submit a patch? --Gabriel
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 21 Nov 2006 23:17:00 +0000
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2 Simple DirectMedia Layer
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4 (SDL)
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6 Version 1.2
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8 ---
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9 http://www.libsdl.org/
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11 This is the Simple DirectMedia Layer, a general API that provides low
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12 level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL,
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13 and 2D framebuffer across multiple platforms.
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15 The current version supports Linux, Windows, Windows CE, BeOS, MacOS,
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16 Mac OS X, FreeBSD, NetBSD, OpenBSD, BSD/OS, Solaris, IRIX, and QNX.
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17 The code contains support for Dreamcast, Atari, AIX, OSF/Tru64,
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18 RISC OS, SymbianOS, and OS/2, but these are not officially supported.
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20 SDL is written in C, but works with C++ natively, and has bindings to
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21 several other languages, including Ada, C#, Eiffel, Erlang, Euphoria,
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22 Guile, Haskell, Java, Lisp, Lua, ML, Objective C, Pascal, Perl, PHP,
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23 Pike, Pliant, Python, Ruby, and Smalltalk.
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25 This library is distributed under GNU LGPL version 2, which can be
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26 found in the file "COPYING". This license allows you to use SDL
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27 freely in commercial programs as long as you link with the dynamic
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28 library.
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29
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30 The best way to learn how to use SDL is to check out the header files in
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31 the "include" subdirectory and the programs in the "test" subdirectory.
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32 The header files and test programs are well commented and always up to date.
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33 More documentation is available in HTML format in "docs/index.html", and
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34 a documentation wiki is available online at:
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35 http://www.libsdl.org/cgi/docwiki.cgi
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37 The test programs in the "test" subdirectory are in the public domain.
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39 Frequently asked questions are answered online:
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40 http://www.libsdl.org/faq.php
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42 If you need help with the library, or just want to discuss SDL related
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43 issues, you can join the developers mailing list:
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44 http://www.libsdl.org/mailing-list.php
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46 Enjoy!
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47 Sam Lantinga (slouken@libsdl.org)
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