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Date: Sat, 10 Apr 2004 02:25:33 -0400 From: Glenn Maynard To: sdl@libsdl.org Subject: [SDL] SDL_SetVideoMode() failing and not setting an error (patch) Running an OpenGL SDL application off 1.2.7, at SDL_InitSubSystem(SDL_INIT_VIDEO) time: Warning: Unable to initialize AAlib mouseUsing AAlib driver: Slang driver 1.0 (slang) SDL_SetVideoMode then fails; SDL_GetError() returns "". The installation problem is straightforward: X (the higher priority driver) isn't running, so SDL is falling back on aalib. However, no error is being set when aalib fails to initialize. This also happens with the svgalib driver. SDL_video.c line ~653 sets mode to NULL, since aalib didn't return an OpenGL surface. Line ~711 ("failed setting a video mode") returns NULL. The attached patch sets an error. It's a horrible, useless error message--it should really say eg. "aalib does not support OpenGL"; this should probably be done earlier in the individual drivers, too.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Apr 2004 19:54:40 +0000
parents 74212992fb08
children 14717b52abc0
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<!DOCTYPE HTML PUBLIC "-//Norman Walsh//DTD DocBook HTML 1.0//EN">
<HTML
><HEAD
><TITLE
>Introduction</TITLE
>
</HEAD
><BODY
BGCOLOR="#FFF8DC"
TEXT="#000000"
LINK="#0000ee"
VLINK="#551a8b"
ALINK="#ff0000"
><DIV
CLASS="NAVHEADER"
>
<HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="PREFACE"
><H1
><A
NAME="AEN8"
>Introduction</A
></H1
><P
>This library is designed to make it easy to write games that run on Linux,
Win32 and BeOS using the various native high-performance media interfaces,
(for video, audio, etc) and presenting a single source-code level API to
your application.  This is a fairly low level API, but using this, completely
portable applications can be written with a great deal of flexibility.</P
><P
>The library is loaded as a dynamically linked library on its native
platform, and is currently compiled natively for Linux, compiled for
Win32 using a Linux hosted GCC
<A
HREF="http://www.libsdl.org/Xmingw32/"
TARGET="_top"
>cross-compilation</A
>
environment, and compiled using the EGCS C++ compiler under BeOS.</P
><P
>An introduction to SDL can be found online at:
<A
HREF="http://www.libsdl.org/intro/toc.html"
TARGET="_top"
>http://www.libsdl.org/intro/</A
>&#13;</P
><P
>There are code examples on each of the main library pages, and there are
fully fleshed example C++ classes and programs in the examples archive,
available on the
<A
HREF="http://www.libsdl.org/download.html"
TARGET="_top"
>SDL download page</A
>.</P
><P
>For an introduction to basic multi-media programming concepts, you might try
some of the following links:
<P
></P
><UL
><LI
><P
><A
HREF="http://www.ziron.com/links/"
TARGET="_top"
>Game Programming Links</A
></P
></LI
><LI
><P
><A
HREF="http://developer.dungeon-crawl.com/"
TARGET="_top"
>Game Developer Search Engine</A
></P
></LI
></UL
></P
><P
>Enjoy!</P
><P
>&nbsp;&nbsp;&nbsp; Sam Lantinga
<TT
CLASS="EMAIL"
>&#60;<A
HREF="mailto:slouken@libsdl.org"
><A
HREF="mailto:slouken@libsdl.org"
TARGET="_top"
>slouken@libsdl.org</A
></A
>&#62;</TT
></P
>
<P>
<br><br><HR>
<H1>Table of Contents</H1>
<UL>
<LI><A HREF="html/index.html">Full Table of Contents</A></LI>
<LI><A HREF="html/guide.html">The SDL Guide</A></LI>
<LI><A HREF="html/reference.html">The SDL Reference</A></LI>
<UL>
<LI><A HREF="html/general.html">Initialization</A></LI>
<LI><A HREF="html/video.html">Video</A></LI>
<LI><A HREF="html/wm.html">Window Manager</A></LI>
<LI><A HREF="html/event.html">Event Handling</A></LI>
<LI><A HREF="html/joystick.html">Joystick</A></LI>
<LI><A HREF="html/audio.html">Audio</A></LI>
<LI><A HREF="html/cdrom.html">CDROM</A></LI>
<LI><A HREF="html/thread.html">Threads</A></LI>
<LI><A HREF="html/time.html">Timers</A></LI>
</UL>
</UL>
</DIV
></BODY
></HTML
>