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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
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga
    Copyright (C) 2001  Hsieh-Fu Tsai

    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
    
    Hsieh-Fu Tsai
    clare@setabox.com
*/

#ifndef _SDL_nxvideo_h
#define _SDL_nxvideo_h

#include <microwin/nano-X.h>

#include "SDL_sysvideo.h"

#ifdef ENABLE_NANOX_DEBUG
#define Dprintf printf
#else
#define Dprintf(ignore...)
#endif

// Hidden "this" pointer for the video functions
#define _THIS   SDL_VideoDevice * this

// Private display data
typedef struct NX_SDL_VISUAL {
    int    bpp ;
    Uint32 red_mask ;
    Uint32 green_mask ;
    Uint32 blue_mask ;
} nx_sdl_visual_t ;

struct SDL_PrivateVideoData {
    GR_WINDOW_ID    SDL_Window ;
    GR_WINDOW_ID    FSwindow ;
    // Flag: true if we have been passed a window
    char            * SDL_windowid ;
    GR_GC_ID        GC ;
    unsigned char   * Image ;
    unsigned char   * Image_buff ;	/* for GrArea*/
    unsigned char   * Clientfb;		/* for DirectFB*/
    nx_sdl_visual_t SDL_Visual ;
    // The current list of available video modes
    SDL_Rect        ** modelist ;
    int             currently_fullscreen ;
    // for fullscreen
    int             OffsetX, OffsetY ;
    // for GammaRamp
    Uint16          * GammaRamp_R, * GammaRamp_G, * GammaRamp_B ;
    // for GrArea, r_mask, g_mask, b_mask
    int             pixel_type ;
#ifdef ENABLE_NANOX_DIRECT_FB
    GR_WINDOW_FB_INFO fbinfo;
#endif
} ;

#define SDL_Window           (this -> hidden -> SDL_Window)
#define FSwindow             (this -> hidden -> FSwindow)
#define SDL_windowid         (this -> hidden -> SDL_windowid)
#define SDL_GC               (this -> hidden -> GC)
#define SDL_Image            (this -> hidden -> Image)
#define Image_buff           (this -> hidden -> Image_buff)
#define Clientfb             (this -> hidden -> Clientfb)
#define SDL_Visual           (this -> hidden -> SDL_Visual)
#define SDL_modelist         (this -> hidden -> modelist)
#define currently_fullscreen (this -> hidden -> currently_fullscreen)
#define OffsetX              (this -> hidden -> OffsetX)
#define OffsetY              (this -> hidden -> OffsetY)
#define GammaRamp_R          (this -> hidden -> GammaRamp_R)
#define GammaRamp_G          (this -> hidden -> GammaRamp_G)
#define GammaRamp_B          (this -> hidden -> GammaRamp_B)
#define pixel_type           (this -> hidden -> pixel_type)
#define fbinfo               (this -> hidden -> fbinfo)

#define CI_SIZE 256   // color index size

#endif  // _SDL_nxvideo_h