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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 f6ffac90895c
children b8d311d90021
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/* StormMesa implementation of SDL OpenGL support */

#include "SDL_sysvideo.h"
#define _THIS   SDL_VideoDevice *_this

#ifdef HAVE_OPENGL
#include <GL/Amigamesa.h>
extern void *AmiGetGLProc(const char *proc);
#endif /* HAVE_OPENGL */

struct SDL_PrivateGLData {
	int gl_active;
};

/* OpenGL functions */
extern int CGX_GL_Init(_THIS);
extern void CGX_GL_Quit(_THIS);
extern int CGX_GL_Update(_THIS);
#ifdef HAVE_OPENGL
extern int CGX_GL_MakeCurrent(_THIS);
extern int CGX_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value);
extern void CGX_GL_SwapBuffers(_THIS);
extern void *CGX_GL_GetProcAddress(_THIS, const char *proc);
extern int CGX_GL_LoadLibrary(_THIS, const char *path);
#endif

#undef _THIS