1 /*

     2     SDL - Simple DirectMedia Layer

     3     Copyright (C) 1997-2006 Sam Lantinga

     4 

     5     This library is free software; you can redistribute it and/or

     6     modify it under the terms of the GNU Lesser General Public

     7     License as published by the Free Software Foundation; either

     8     version 2.1 of the License, or (at your option) any later version.

     9 

    10     This library is distributed in the hope that it will be useful,

    11     but WITHOUT ANY WARRANTY; without even the implied warranty of

    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13     Lesser General Public License for more details.

    14 

    15     You should have received a copy of the GNU Lesser General Public

    16     License along with this library; if not, write to the Free Software

    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    18 

    19     Sam Lantinga

    20     slouken@libsdl.org

    21 */

    22 #include "SDL_config.h"

    23 

    24 /* This is currently only used to enable DGA mouse.

    25    There is a completely separate DGA driver that is fullscreen-only.

    26 */

    27 

    28 #include "SDL_video.h"

    29 #include "../SDL_cursor_c.h"

    30 #include "SDL_x11dga_c.h"

    31 

    32 /* Global for the error handler */

    33 int dga_event, dga_error = -1;

    34 

    35 void X11_EnableDGAMouse(_THIS)

    36 {

    37 #if SDL_VIDEO_DRIVER_X11_DGAMOUSE

    38     static int use_dgamouse = -1;

    39 

    40     /* Check configuration to see if we should use DGA mouse */

    41     if ( use_dgamouse < 0 ) {

    42         int dga_major, dga_minor;

    43         int dga_flags;

    44         const char *env_use_dgamouse;

    45 

    46         use_dgamouse = 1;

    47         env_use_dgamouse = SDL_getenv("SDL_VIDEO_X11_DGAMOUSE");

    48         if ( env_use_dgamouse ) {

    49             use_dgamouse = SDL_atoi(env_use_dgamouse);

    50         }

    51         /* Check for buggy X servers */

    52         if ( use_dgamouse && BUGGY_XFREE86(==, 4000) ) {

    53             use_dgamouse = 0;

    54         }

    55         if ( !use_dgamouse || !local_X11 ||

    56              !SDL_NAME(XF86DGAQueryExtension)(SDL_Display, &dga_event, &dga_error) ||

    57              !SDL_NAME(XF86DGAQueryVersion)(SDL_Display, &dga_major, &dga_minor) ||

    58              !SDL_NAME(XF86DGAQueryDirectVideo)(SDL_Display, SDL_Screen, &dga_flags) ||

    59              !(dga_flags & XF86DGADirectPresent) ) {

    60             use_dgamouse = 0;

    61         }

    62     }

    63 

    64     if ( use_dgamouse && !(using_dga & DGA_MOUSE) ) {

    65 	if ( SDL_NAME(XF86DGADirectVideo)(SDL_Display, SDL_Screen, XF86DGADirectMouse) ) {

    66             using_dga |= DGA_MOUSE;

    67         }

    68     }

    69 #endif /* SDL_VIDEO_DRIVER_X11_DGAMOUSE */

    70 }

    71 

    72 /* Argh.  Glide resets DGA mouse mode when it makes the context current! */

    73 void X11_CheckDGAMouse(_THIS)

    74 {

    75 #if SDL_VIDEO_DRIVER_X11_DGAMOUSE

    76     if ( using_dga & DGA_MOUSE ) {

    77 	SDL_NAME(XF86DGADirectVideo)(SDL_Display,SDL_Screen,XF86DGADirectMouse);

    78     }

    79 #endif

    80 }

    81 

    82 void X11_DisableDGAMouse(_THIS)

    83 {

    84 #if SDL_VIDEO_DRIVER_X11_DGAMOUSE

    85     if ( using_dga & DGA_MOUSE ) {

    86 	SDL_NAME(XF86DGADirectVideo)(SDL_Display, SDL_Screen, 0);

    87         using_dga &= ~DGA_MOUSE;

    88     }

    89 #endif /* SDL_VIDEO_DRIVER_X11_DGAMOUSE */

    90 }