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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
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<HTML
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>Chapter 5. General</H1
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><B
>Table of Contents</B
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><DT
><A
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>SDL_Init</A
>&nbsp;--&nbsp;Initializes SDL</DT
><DT
><A
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>SDL_InitSubSystem</A
>&nbsp;--&nbsp;Initialize subsystems</DT
><DT
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>SDL_QuitSubSystem</A
>&nbsp;--&nbsp;Shut down a subsystem</DT
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>SDL_Quit</A
>&nbsp;--&nbsp;Shut down SDL</DT
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>SDL_WasInit</A
>&nbsp;--&nbsp;Check which subsystems are initialized</DT
><DT
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>SDL_GetError</A
>&nbsp;--&nbsp;Get SDL error string</DT
><DT
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>SDL_envvars</A
>&nbsp;--&nbsp;SDL environment variables</DT
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><P
>Before SDL can be used in a program it must be initialized with <A
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><TT
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>SDL_Init</TT
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>. <TT
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>SDL_Init</TT
> initializes all the subsystems that the user requests (video, audio, joystick, timers and/or cdrom). Once SDL is initialized with <TT
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>SDL_Init</TT
> subsystems can be shut down and initialized as needed using <A
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>SDL_InitSubSystem</TT
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> and <A
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>.</P
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>SDL must also be shut down before the program exits to make sure it cleans up correctly. Calling <A
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