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>
date Fri, 12 Nov 2004 21:39:04 +0000
parents 72ef7ce609ef
children 450721ad5436
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72ef7ce609ef Greatly simplified the SDL CPU info code
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1 #if defined(USE_ASM_MIXER_VC)
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64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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2 // headers for MMX assembler version of SDL_MixAudio
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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3 // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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4 // Converted to Intel ASM notation by Cth
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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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
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6 //
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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7 // Assumes buffer size in bytes is a multiple of 16
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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8 // Assumes SDL_MIX_MAXVOLUME = 128
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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9
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
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10 void SDL_MixAudio_MMX_S16_VC(char* ,char* ,unsigned int ,int );
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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11 void SDL_MixAudio_MMX_S8_VC(char* ,char* ,unsigned int ,int );
64fe373be3dc Cth converted the MMX audio mixing routines to VC++ syntax
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12 #endif