Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer_MMX_VC.h @ 968:4675910b0b7b
Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
From: Hannu Savolainen
Subject: Re: SDL uses obsolete OSS features
I did some work on getting OSS to work better with SDL. There have been
some problems with select which should be fixed now.
I'm having some problems in understanding what is the purpose of the
DSP_WaitAudio() routine. I added a return to the very beginning of this
routine and commendted out the define for USE_BLOCKING_WRITES. At least
lbreakout2 seems to work as well as earlier. The latencies are the same.
An ordinary blocking write does exactly the same thing than DSP_WaitAudio
does. So I would recommend using the USE_BLOCKING_WRITES approach and
removing everything from the DSP_WaitAudio routine. Also enabling
USE_BLOCKING_WRITES makes it possible to simplify DSP_PlayAudio() because
you don't need to handle the partial writes (the do-while loop).
Attached is a patch against SDL-1.2.7. After these changes SDL will use
OSS as it's designed to be used (make it as simple as possible). This code
should work with all OSS implementations because it uses only the very
fundamental features that have been there since the jurassic times.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 12 Nov 2004 21:39:04 +0000 |
parents | 72ef7ce609ef |
children | 450721ad5436 |
rev | line source |
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746
72ef7ce609ef
Greatly simplified the SDL CPU info code
Sam Lantinga <slouken@libsdl.org>
parents:
574
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1 #if defined(USE_ASM_MIXER_VC) |
574
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
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2 // headers for MMX assembler version of SDL_MixAudio |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
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3 // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr) |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
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4 // Converted to Intel ASM notation by Cth |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
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5 // This code is licensed under the LGPL (see COPYING for details) |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
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6 // |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
7 // Assumes buffer size in bytes is a multiple of 16 |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
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8 // Assumes SDL_MIX_MAXVOLUME = 128 |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
9 |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
10 void SDL_MixAudio_MMX_S16_VC(char* ,char* ,unsigned int ,int ); |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
11 void SDL_MixAudio_MMX_S8_VC(char* ,char* ,unsigned int ,int ); |
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
12 #endif |