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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 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 (at) 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 }
     91