author Sam Lantinga <>
Sat, 28 Jun 2003 17:27:33 +0000
changeset 638 b0108e9dea53
parent 453 a6fa62b1be09
child 1251 86d0d01290ea
permissions -rw-r--r--
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 ( 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.

Project files for embedded Visual C++ 4.0 can be found in

There are several SDL features not available in the WinCE port of SDL.

- DirectX is not yet available
- Semaphores are not available
- Joystick support is not available
- CD-ROM control is not available

In addition, there are several features that run in "degraded" mode:

Preprocessor Symbol		Effect
===================		=================================

USE_GETTICKCOUNT		Less accurate values for SDL time functions
USE_SETTIMER			Use only a single marginally accurate timer

DISABLE_ICON_SUPPORT		Can't set the runtime window icon

USE_STATIC_CURSOR		Only the arrow cursor is available

NO_GETKEYBOARDSTATE		Can't get modifier state on keyboard focus

NO_GETKEYBOARDSTATE		Very limited keycode translation

NO_GETDIBITS			Can't distinguish between 15 bpp and 16 bpp
NO_GAMMA_SUPPORT		Gamma correction not available