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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* This is currently only used to enable DGA mouse.
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29 The new fullscreen code makes it very difficult to handle DGA dynamically.
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30 There will be a completely separate DGA driver that is fullscreen-only.
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31 */
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32
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33 #include <stdlib.h> /* For getenv() */
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34 #include "SDL_video.h"
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35 #include "SDL_cursor_c.h"
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36 #include "SDL_x11dga_c.h"
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37
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38 /* Global for the error handler */
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39 int dga_event, dga_error = -1;
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40
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41 void X11_EnableDGAMouse(_THIS)
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42 {
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43 #ifdef XFREE86_DGAMOUSE
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44 int dga_major, dga_minor;
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45 int use_dgamouse;
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46 const char *env_use_dgamouse;
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47
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48 /* Check configuration to see if we should use DGA mouse */
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49 #ifdef DEFAULT_DGAMOUSE
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50 use_dgamouse = 1;
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51 #else
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52 use_dgamouse = 0;
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53 #endif
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54 env_use_dgamouse = getenv("SDL_VIDEO_X11_DGAMOUSE");
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55 if ( env_use_dgamouse ) {
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56 use_dgamouse = atoi(env_use_dgamouse);
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57 }
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58 /* Check for buggy X servers */
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59 if ( use_dgamouse && BUGGY_XFREE86(==, 4000) ) {
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60 use_dgamouse = 0;
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61 }
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62 /* Only use DGA mouse if the cursor is not showing (in relative mode) */
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63 if ( use_dgamouse && local_X11 && !(using_dga & DGA_MOUSE) &&
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64 XF86DGAQueryExtension(SDL_Display, &dga_event, &dga_error) &&
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65 XF86DGAQueryVersion(SDL_Display, &dga_major, &dga_minor) ) {
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66 if ( XF86DGADirectVideo(SDL_Display, SDL_Screen, XF86DGADirectMouse) ) {
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67 using_dga |= DGA_MOUSE;
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68 }
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69 }
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70 #endif /* XFREE86_DGAMOUSE */
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71 }
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72
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73 /* Argh. Glide resets DGA mouse mode when it makes the context current! */
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74 void X11_CheckDGAMouse(_THIS)
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75 {
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76 #ifdef XFREE86_DGAMOUSE
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77 int flags;
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78
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79 if ( using_dga & DGA_MOUSE ) {
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80 XF86DGAQueryDirectVideo(SDL_Display, SDL_Screen, &flags);
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81 if ( ! (flags & XF86DGADirectMouse) ) {
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82 XF86DGADirectVideo(SDL_Display,SDL_Screen,XF86DGADirectMouse);
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83 }
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84 }
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85 #endif
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86 }
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87
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88 void X11_DisableDGAMouse(_THIS)
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89 {
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90 #ifdef XFREE86_DGAMOUSE
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91 if ( using_dga & DGA_MOUSE ) {
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92 XF86DGADirectVideo(SDL_Display, SDL_Screen, 0);
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93 using_dga &= ~DGA_MOUSE;
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94 }
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95 #endif /* XFREE86_DGAMOUSE */
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96 }
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