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annotate include/SDL_cpuinfo.h @ 765:4c2ba6161939

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Editors Note: The original patch was modified to use SDL_Delay() instead of nanosleep because nanosleep may not be portable to all systems using SDL with the ALSA backend. This may be a moot point with the switch to blocking writes anyway... Date: Sat, 27 Dec 2003 21:47:36 +0100 From: Michel Daenzer To: Debian Bug Tracking System Subject: [SDL] Bug#225252: [PATCH] ALSA fixes Package: libsdl1.2debian-all Version: 1.2.6-2 Severity: normal Tags: patch For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU usage, interrupted sound and stuttering in some games here. Taking a nanosleep whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more efficient to use blocking mode for the actual sound playback. Feedback from the SDL and ALSA lists appreciated. The patch also fixes the default ALSA device to be used.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 15:40:50 +0000
parents 71ee03909f42
children b8d311d90021
rev   line source
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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4
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5 This library is free software; you can redistribute it and/or
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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6 modify it under the terms of the GNU Library General Public
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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7 License as published by the Free Software Foundation; either
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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8 version 2 of the License, or (at your option) any later version.
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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9
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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29 /* CPU feature detection for SDL */
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30
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31 #ifndef _SDL_cpuinfo_h
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32 #define _SDL_cpuinfo_h
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34 #include "begin_code.h"
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35 /* Set up for C function definitions, even when using C++ */
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36 #ifdef __cplusplus
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37 extern "C" {
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38 #endif
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39
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40 /* This function returns true if the CPU has the RDTSC instruction
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41 */
71ee03909f42 Greatly simplified the SDL CPU info code
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42 extern DECLSPEC SDL_bool SDLCALL SDL_HasRDTSC();
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43
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44 /* This function returns true if the CPU has MMX features
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45 */
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46 extern DECLSPEC SDL_bool SDLCALL SDL_HasMMX();
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47
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48 /* This function returns true if the CPU has 3DNow features
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49 */
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50 extern DECLSPEC SDL_bool SDLCALL SDL_Has3DNow();
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51
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52 /* This function returns true if the CPU has SSE features
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53 */
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54 extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE();
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56 /* Ends C function definitions when using C++ */
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57 #ifdef __cplusplus
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58 }
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59 #endif
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60 #include "close_code.h"
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61
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62 #endif /* _SDL_cpuinfo_h */