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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 19418e4422cb
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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
*/

/*
    SDL_epocvideo.h
    Epoc based SDL video driver implementation

    Epoc version by Hannu Viitala (hannu.j.viitala@mbnet.fi)
*/

#ifndef _SDL_epocvideo_h
#define _SDL_epocvideo_h

extern "C" {
#include "SDL_mouse.h"
#include "SDL_sysvideo.h"
};

#include <e32std.h>
#include <bitdev.h> 
#include <w32std.h>

/* Hidden "this" pointer for the video functions */
#define _THIS	SDL_VideoDevice *_this
#define Private	_this->hidden

#define SDL_NUMMODES	4

/* Private display data */
struct SDL_PrivateVideoData {

    SDL_Rect            *SDL_modelist[SDL_NUMMODES+1];

	/* Epoc window server info */
    
    RWsSession			EPOC_WsSession;
	RWindowGroup		EPOC_WsWindowGroup;
    TInt                EPOC_WsWindowGroupID;
	RWindow				EPOC_WsWindow;
	CWsScreenDevice*	EPOC_WsScreen;
	CWindowGc*			EPOC_WindowGc;
	TRequestStatus		EPOC_WsEventStatus;
	TRequestStatus		EPOC_RedrawEventStatus;
	TWsEvent			EPOC_WsEvent;
	TWsRedrawEvent		EPOC_RedrawEvent;
    #ifdef __WINS__
    CWsBitmap*          EPOC_Bitmap;
    #endif
    TBool               EPOC_IsWindowFocused; //!!Not used for anything yet!

    /* Screen hardware frame buffer info */

   	TBool				EPOC_HasFrameBuffer;
	TInt				EPOC_BytesPerPixel;
	TInt				EPOC_BytesPerScanLine;
	TDisplayMode		EPOC_DisplayMode;
	TSize				EPOC_ScreenSize;
	TUint8*				EPOC_FrameBuffer;		/* if NULL in HW we can't do direct screen access */
    TInt                EPOC_ScreenOffset;

    /* Simulate double screen height */
    TBool               EPOC_ShrinkedHeight;
};

extern "C" {
extern void RedrawWindowL(_THIS);
};


#endif /* _SDL_epocvideo_h */