/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* 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 "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)
{
#if SDL_VIDEO_DRIVER_X11_DGAMOUSE
    int dga_major, dga_minor;
    int use_dgamouse;
    const char *env_use_dgamouse;

    /* Check configuration to see if we should use DGA mouse */
    use_dgamouse = 1;
    env_use_dgamouse = SDL_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 /* SDL_VIDEO_DRIVER_X11_DGAMOUSE */
}

/* Argh.  Glide resets DGA mouse mode when it makes the context current! */
void
X11_CheckDGAMouse (_THIS)
{
#if SDL_VIDEO_DRIVER_X11_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)
{
#if SDL_VIDEO_DRIVER_X11_DGAMOUSE
    if (using_dga & DGA_MOUSE) {
        SDL_NAME (XF86DGADirectVideo) (SDL_Display, SDL_Screen, 0);
        using_dga &= ~DGA_MOUSE;
    }
#endif /* SDL_VIDEO_DRIVER_X11_DGAMOUSE */
}

/* vi: set ts=4 sw=4 expandtab: */