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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 355632dca928
children
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<HTML
><HEAD
><TITLE
>SDL_CDPlayTracks</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="SDL Library Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="CD-ROM"
HREF="cdrom.html"><LINK
REL="PREVIOUS"
TITLE="SDL_CDPlay"
HREF="sdlcdplay.html"><LINK
REL="NEXT"
TITLE="SDL_CDPause"
HREF="sdlcdpause.html"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFF8DC"
TEXT="#000000"
LINK="#0000ee"
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><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>SDL Library Documentation</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="sdlcdplay.html"
ACCESSKEY="P"
>Prev</A
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ACCESSKEY="N"
>Next</A
></TD
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><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="SDLCDPLAYTRACKS"
></A
>SDL_CDPlayTracks</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN7375"
></A
><H2
>Name</H2
>SDL_CDPlayTracks&nbsp;--&nbsp;Play the given CD track(s)</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN7378"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN7379"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="FSFUNC"
>SDL_CDPlayTracks</B
></CODE
>(SDL_CD *cdrom, int start_track, int start_frame, int ntracks, int nframes));</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7385"
></A
><H2
>Description</H2
><P
><TT
CLASS="FUNCTION"
>SDL_CDPlayTracks</TT
> plays the given CD starting at track
<TT
CLASS="PARAMETER"
><I
>start_track</I
></TT
>, for <TT
CLASS="PARAMETER"
><I
>ntracks</I
></TT
> tracks.  </P
><P
><TT
CLASS="PARAMETER"
><I
>start_frame</I
></TT
> is the frame offset, from the beginning of the <TT
CLASS="PARAMETER"
><I
>start_track</I
></TT
>, at which to start. <TT
CLASS="PARAMETER"
><I
>nframes</I
></TT
> is the frame offset, from the beginning of the last track (<TT
CLASS="PARAMETER"
><I
>start_track</I
></TT
>+<TT
CLASS="PARAMETER"
><I
>ntracks</I
></TT
>), at which to end playing.</P
><P
><TT
CLASS="FUNCTION"
>SDL_CDPlayTracks</TT
> should only be called after calling 
<A
HREF="sdlcdstatus.html"
><TT
CLASS="FUNCTION"
>SDL_CDStatus</TT
></A
> 
to get track information about the CD.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Data tracks are ignored.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7403"
></A
><H2
>Return Value</H2
><P
>Returns <SPAN
CLASS="RETURNVALUE"
>0</SPAN
>, or <SPAN
CLASS="RETURNVALUE"
>-1</SPAN
> 
if there was an error.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7408"
></A
><H2
>Examples</H2
><P
><PRE
CLASS="PROGRAMLISTING"
>/* assuming cdrom is a previously opened device */
/* Play the entire CD */
if(CD_INDRIVE(SDL_CDStatus(cdrom)))
  SDL_CDPlayTracks(cdrom, 0, 0, 0, 0);

/* Play the first track */
if(CD_INDRIVE(SDL_CDStatus(cdrom)))
  SDL_CDPlayTracks(cdrom, 0, 0, 1, 0);

/* Play first 15 seconds of the 2nd track */
if(CD_INDRIVE(SDL_CDStatus(cdrom)))
  SDL_CDPlayTracks(cdrom, 1, 0, 0, CD_FPS*15);</PRE
>
&#13;</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN7412"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlcdplay.html"
><TT
CLASS="FUNCTION"
>SDL_CDPlay</TT
></A
>,
<A
HREF="sdlcdstatus.html"
><TT
CLASS="FUNCTION"
>SDL_CDStatus</TT
></A
>,
<A
HREF="sdlcd.html"
><TT
CLASS="FUNCTION"
>SDL_CD</TT
></A
></P
></DIV
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>Prev</A
></TD
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HREF="index.html"
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>Home</A
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WIDTH="33%"
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><TR
><TD
WIDTH="33%"
ALIGN="left"
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>SDL_CDPlay</TD
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