README
author Sam Lantinga <slouken@libsdl.org>
Sat, 28 Jun 2003 17:27:33 +0000
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Date: Sun, 11 May 2003 19:59:06 +0300 From: Pasi K?rkk?inen Subject: [PATCH] fix SDL OpenGL segfault with DRI/Mesa drivers and Glew Hello! The attached patch fixes a bug in SDL which causes SDL to crash in X11_GL_Shutdown() if you are using DRI/Mesa drivers AND glew (http://glew.sf.net). The bug is caused by a namespace collision affecting dlsym() to fetch wrong pointer for glXReleaseBuffersMESA() (uninitialized pointer from glew because the extension is NOT supported by the driver) and then SDL calling it in X11_GL_Shutdown(). SDL should check if the glXReleaseBuffersMESA() is really supported by the driver (from the extensions string) before calling it. Attached patch adds extension string parsing to check if glXReleaseBuffersMESA() is really supported (and this way prevents the segfault). Availability of the extensions should be _always_ checked from the extensions string rather than using dlsym()! Please add it to the next version of SDL. Thanks to gltron and author of glew to help fixing this.
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                         Simple DirectMedia Layer
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                                  (SDL)
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                                Version 1.2
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---
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http://www.libsdl.org/
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This is the Simple DirectMedia Layer, a general API that provides low
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level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL,
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and 2D framebuffer across multiple platforms.
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SDL is written in C, but works with C++ natively, and has bindings to
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several other languages, including Ada, C#, Eiffel, Java, Lua, ML,
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Objective C, Perl, PHP, Pike, Python, and Ruby.
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The current version supports Linux, Windows, BeOS, MacOS, MacOS X,
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FreeBSD, OpenBSD, BSD/OS, Solaris, and IRIX.  The code contains support
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for Windows CE, AmigaOS, Dreamcast, Atari, QNX, NetBSD, AIX, OSF/Tru64,
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RISC OS, and SymbianOS, but these are not officially supported.
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This library is distributed under GNU LGPL version 2, which can be
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found in the file  "COPYING".  This license allows you to use SDL
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freely in commercial programs as long as you link with the dynamic
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library.
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The best way to learn how to use SDL is to check out the header files in
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the "include" subdirectory and the programs in the "test" subdirectory.
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The header files and test programs are well commented and always up to date.
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More documentation is available in HTML format in "./docs/index.html"
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The test programs in the "test" subdirectory are in the public domain.
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Frequently asked questions are answered online:
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	http://www.libsdl.org/faq.php
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If you need help with the library, or just want to discuss SDL related
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issues, you can join the developers mailing list:
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	http://www.libsdl.org/mailing-list.php
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Enjoy!
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	Sam Lantinga				(slouken@libsdl.org)
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