Mercurial > sdl-ios-xcode

view src/video/x11/SDL_x11dga.c @ 968:4675910b0b7b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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 c9b51268668f
line wrap: on
line source

/*
    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

/* This is currently only used to enable DGA mouse.
   The new fullscreen code makes it very difficult to handle DGA dynamically.
   There will be a completely separate DGA driver that is fullscreen-only.
*/

#include <stdlib.h>		/* For getenv() */
#include "SDL_video.h"
#include "SDL_cursor_c.h"
#include "SDL_x11dga_c.h"

/* Global for the error handler */
int dga_event, dga_error = -1;

void X11_EnableDGAMouse(_THIS)
{
#ifdef XFREE86_DGAMOUSE
    int dga_major, dga_minor;
    int use_dgamouse;
    const char *env_use_dgamouse;

    /* Check configuration to see if we should use DGA mouse */
#ifdef DEFAULT_DGAMOUSE
    use_dgamouse = 1;
#else
    use_dgamouse = 0;
#endif
    env_use_dgamouse = getenv("SDL_VIDEO_X11_DGAMOUSE");
    if ( env_use_dgamouse ) {
        use_dgamouse = atoi(env_use_dgamouse);
    }
    /* Check for buggy X servers */
    if ( use_dgamouse && BUGGY_XFREE86(==, 4000) ) {
        use_dgamouse = 0;
    }
    /* Only use DGA mouse if the cursor is not showing (in relative mode) */
    if ( use_dgamouse && local_X11 && !(using_dga & DGA_MOUSE) &&
         SDL_NAME(XF86DGAQueryExtension)(SDL_Display, &dga_event, &dga_error) &&
         SDL_NAME(XF86DGAQueryVersion)(SDL_Display, &dga_major, &dga_minor) ) {
	if ( SDL_NAME(XF86DGADirectVideo)(SDL_Display, SDL_Screen, XF86DGADirectMouse) ) {
            using_dga |= DGA_MOUSE;
        }
    }
#endif /* XFREE86_DGAMOUSE */
}

/* Argh.  Glide resets DGA mouse mode when it makes the context current! */
void X11_CheckDGAMouse(_THIS)
{
#ifdef XFREE86_DGAMOUSE
    int flags;

    if ( using_dga & DGA_MOUSE ) {
        SDL_NAME(XF86DGAQueryDirectVideo)(SDL_Display, SDL_Screen, &flags);
        if ( ! (flags & XF86DGADirectMouse) ) {
                SDL_NAME(XF86DGADirectVideo)(SDL_Display,SDL_Screen,XF86DGADirectMouse);
        }
    }
#endif
}

void X11_DisableDGAMouse(_THIS)
{
#ifdef XFREE86_DGAMOUSE
    if ( using_dga & DGA_MOUSE ) {
	SDL_NAME(XF86DGADirectVideo)(SDL_Display, SDL_Screen, 0);
        using_dga &= ~DGA_MOUSE;
    }
#endif /* XFREE86_DGAMOUSE */
}