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First shot at new audio data types (int32 and float32). Notable changes: - Converters between types are autogenerated. Instead of making multiple passes over the data with seperate filters for endianess, size, signedness, etc, converting between data types is always one specialized filter. This simplifies SDL_BuildAudioCVT(), which otherwise had a million edge cases with the new types, and makes the actually conversions more CPU cache friendly. Left a stub for adding specific optimized versions of these routines (SSE/MMX/Altivec, assembler, etc) - Autogenerated converters are built by SDL/src/audio/sdlgenaudiocvt.pl. This does not need to be run unless tweaking the code, and thus doesn't need integration into the build system. - Went through all the drivers and tried to weed out all the "Uint16" references that are better specified with the new SDL_AudioFormat typedef. - Cleaned out a bunch of hardcoded bitwise magic numbers and replaced them with new SDL_AUDIO_* macros. - Added initial float32 and int32 support code. Theoretically, existing drivers will push these through converters to get the data they want to feed to the hardware. Still TODO: - Optimize and debug new converters. - Update the CoreAudio backend to accept float32 data directly. - Other backends, too? - SDL_LoadWAV() needs to be updated to support int32 and float32 .wav files (both of which exist and can be generated by 'sox' for testing purposes). - Update the mixer to handle new datatypes. - Optionally update SDL_sound and SDL_mixer, etc.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 24 Aug 2006 12:10:46 +0000
parents 355632dca928
children
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<HTML
><HEAD
><TITLE
>SDL_Quit</TITLE
><META
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><H1
><A
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>SDL_Quit</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN585"
></A
><H2
>Name</H2
>SDL_Quit&nbsp;--&nbsp;Shut down SDL</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN588"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN589"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>void <B
CLASS="FSFUNC"
>SDL_Quit</B
></CODE
>(void);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN595"
></A
><H2
>Description</H2
><P
><TT
CLASS="FUNCTION"
>SDL_Quit</TT
> shuts down all SDL subsystems and frees the resources allocated to them. This should always be called before you exit. For the sake of simplicity you can set <TT
CLASS="FUNCTION"
>SDL_Quit</TT
> as your <TT
CLASS="FUNCTION"
>atexit</TT
> call, like:
<PRE
CLASS="PROGRAMLISTING"
>SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO);
atexit(SDL_Quit);
.
.</PRE
></P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>While using <TT
CLASS="FUNCTION"
>atexit</TT
> maybe be fine for small programs, more advanced users should shut down SDL in their own cleanup code. Plus, using <TT
CLASS="FUNCTION"
>atexit</TT
> in a library is a sure way to crash dynamically loaded code</P
></BLOCKQUOTE
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><A
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></A
><H2
>See Also</H2
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><TT
CLASS="FUNCTION"
>SDL_QuitSubsystem</TT
></A
>,
<A
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><TT
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>SDL_Init</TT
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