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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 b8d311d90021
children f31856cf29ae
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 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

/* Main include header for the SDL library */

#ifndef _SDL_H
#define _SDL_H

#include "SDL_main.h"
#include "SDL_types.h"
#include "SDL_getenv.h"
#include "SDL_error.h"
#include "SDL_rwops.h"
#include "SDL_timer.h"
#include "SDL_audio.h"
#include "SDL_cdrom.h"
#include "SDL_joystick.h"
#include "SDL_events.h"
#include "SDL_video.h"
#include "SDL_byteorder.h"
#include "SDL_version.h"

#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif

/* As of version 0.5, SDL is loaded dynamically into the application */

/* These are the flags which may be passed to SDL_Init() -- you should
   specify the subsystems which you will be using in your application.
*/
#define	SDL_INIT_TIMER		0x00000001
#define SDL_INIT_AUDIO		0x00000010
#define SDL_INIT_VIDEO		0x00000020
#define SDL_INIT_CDROM		0x00000100
#define SDL_INIT_JOYSTICK	0x00000200
#define SDL_INIT_NOPARACHUTE	0x00100000	/* Don't catch fatal signals */
#define SDL_INIT_EVENTTHREAD	0x01000000	/* Not supported on all OS's */
#define SDL_INIT_EVERYTHING	0x0000FFFF

/* This function loads the SDL dynamically linked library and initializes 
 * the subsystems specified by 'flags' (and those satisfying dependencies)
 * Unless the SDL_INIT_NOPARACHUTE flag is set, it will install cleanup
 * signal handlers for some commonly ignored fatal signals (like SIGSEGV)
 */
extern DECLSPEC int SDLCALL SDL_Init(Uint32 flags);

/* This function initializes specific SDL subsystems */
extern DECLSPEC int SDLCALL SDL_InitSubSystem(Uint32 flags);

/* This function cleans up specific SDL subsystems */
extern DECLSPEC void SDLCALL SDL_QuitSubSystem(Uint32 flags);

/* This function returns mask of the specified subsystems which have
   been initialized.
   If 'flags' is 0, it returns a mask of all initialized subsystems.
*/
extern DECLSPEC Uint32 SDLCALL SDL_WasInit(Uint32 flags);

/* This function cleans up all initialized subsystems and unloads the
 * dynamically linked library.  You should call it upon all exit conditions.
 */
extern DECLSPEC void SDLCALL SDL_Quit(void);

/* Ends C function definitions when using C++ */
#ifdef __cplusplus
}
#endif
#include "close_code.h"

#endif /* _SDL_H */