src/video/x11/SDL_x11xinput2.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 31 May 2015 22:59:59 -0400
changeset 9696 a7e9b75ec1c9
parent 9679 7fc4a8be47a8
child 9721 957a6ed39ad0
permissions -rw-r--r--
X11: search all XI2 touch devices, not just masters (thanks, Volumetic!).

Otherwise, you won't find touch devices that aren't currently assigned to a
system cursor.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "../../SDL_internal.h"
    22 
    23 #if SDL_VIDEO_DRIVER_X11
    24 
    25 #include "SDL_x11video.h"
    26 #include "SDL_x11xinput2.h"
    27 #include "../../events/SDL_mouse_c.h"
    28 #include "../../events/SDL_touch_c.h"
    29 
    30 #define MAX_AXIS 16
    31 
    32 #if SDL_VIDEO_DRIVER_X11_XINPUT2
    33 static int xinput2_initialized = 0;
    34 
    35 #if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH
    36 static int xinput2_multitouch_supported = 0;
    37 #endif
    38 
    39 /* Opcode returned X11_XQueryExtension
    40  * It will be used in event processing
    41  * to know that the event came from
    42  * this extension */
    43 static int xinput2_opcode;
    44 
    45 static void parse_valuators(const double *input_values,unsigned char *mask,int mask_len,
    46                             double *output_values,int output_values_len) {
    47     int i = 0,z = 0;
    48     int top = mask_len * 8;
    49     if (top > MAX_AXIS)
    50         top = MAX_AXIS;
    51 
    52     SDL_memset(output_values,0,output_values_len * sizeof(double));
    53     for (; i < top && z < output_values_len; i++) {
    54         if (XIMaskIsSet(mask, i)) {
    55             const int value = (int) *input_values;
    56             output_values[z] = value;
    57             input_values++;
    58         }
    59         z++;
    60     }
    61 }
    62 
    63 static int
    64 query_xinput2_version(Display *display, int major, int minor)
    65 {
    66     /* We don't care if this fails, so long as it sets major/minor on it's way out the door. */
    67     X11_XIQueryVersion(display, &major, &minor);
    68     return ((major * 1000) + minor);
    69 }
    70 
    71 static SDL_bool
    72 xinput2_version_atleast(const int version, const int wantmajor, const int wantminor)
    73 {
    74     return ( version >= ((wantmajor * 1000) + wantminor) );
    75 }
    76 #endif /* SDL_VIDEO_DRIVER_X11_XINPUT2 */
    77 
    78 void
    79 X11_InitXinput2(_THIS)
    80 {
    81 #if SDL_VIDEO_DRIVER_X11_XINPUT2
    82     SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
    83 
    84     int version = 0;
    85     XIEventMask eventmask;
    86     unsigned char mask[3] = { 0,0,0 };
    87     int event, err;
    88 
    89     /*
    90     * Initialize XInput 2
    91     * According to http://who-t.blogspot.com/2009/05/xi2-recipes-part-1.html its better
    92     * to inform Xserver what version of Xinput we support.The server will store the version we support.
    93     * "As XI2 progresses it becomes important that you use this call as the server may treat the client
    94     * differently depending on the supported version".
    95     *
    96     * FIXME:event and err are not needed but if not passed X11_XQueryExtension returns SegmentationFault
    97     */
    98     if (!SDL_X11_HAVE_XINPUT2 ||
    99         !X11_XQueryExtension(data->display, "XInputExtension", &xinput2_opcode, &event, &err)) {
   100         return; /* X server does not have XInput at all */
   101     }
   102 
   103     /* We need at least 2.2 for Multitouch, 2.0 otherwise. */
   104     version = query_xinput2_version(data->display, 2, 2);
   105     if (!xinput2_version_atleast(version, 2, 0)) {
   106         return; /* X server does not support the version we want at all. */
   107     }
   108 
   109     xinput2_initialized = 1;
   110 
   111 #if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH  /* Multitouch needs XInput 2.2 */
   112     xinput2_multitouch_supported = xinput2_version_atleast(version, 2, 2);
   113 #endif
   114 
   115     /* Enable  Raw motion events for this display */
   116     eventmask.deviceid = XIAllMasterDevices;
   117     eventmask.mask_len = sizeof(mask);
   118     eventmask.mask = mask;
   119 
   120     XISetMask(mask, XI_RawMotion);
   121 
   122     if (X11_XISelectEvents(data->display,DefaultRootWindow(data->display),&eventmask,1) != Success) {
   123         return;
   124     }
   125 #endif
   126 }
   127 
   128 int
   129 X11_HandleXinput2Event(SDL_VideoData *videodata,XGenericEventCookie *cookie)
   130 {
   131 #if SDL_VIDEO_DRIVER_X11_XINPUT2
   132     if(cookie->extension != xinput2_opcode) {
   133         return 0;
   134     }
   135     switch(cookie->evtype) {
   136         case XI_RawMotion: {
   137             const XIRawEvent *rawev = (const XIRawEvent*)cookie->data;
   138             SDL_Mouse *mouse = SDL_GetMouse();
   139             double relative_cords[2];
   140 
   141             if (!mouse->relative_mode || mouse->relative_mode_warp) {
   142                 return 0;
   143             }
   144 
   145             parse_valuators(rawev->raw_values,rawev->valuators.mask,
   146                             rawev->valuators.mask_len,relative_cords,2);
   147             SDL_SendMouseMotion(mouse->focus,mouse->mouseID,1,(int)relative_cords[0],(int)relative_cords[1]);
   148             return 1;
   149             }
   150             break;
   151 #if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH
   152         case XI_TouchBegin: {
   153             const XIDeviceEvent *xev = (const XIDeviceEvent *) cookie->data;
   154             SDL_SendTouch(xev->sourceid,xev->detail,
   155                       SDL_TRUE, xev->event_x, xev->event_y, 1.0);
   156             return 1;
   157             }
   158             break;
   159         case XI_TouchEnd: {
   160             const XIDeviceEvent *xev = (const XIDeviceEvent *) cookie->data;
   161             SDL_SendTouch(xev->sourceid,xev->detail,
   162                       SDL_FALSE, xev->event_x, xev->event_y, 1.0);
   163             return 1;
   164             }
   165             break;
   166         case XI_TouchUpdate: {
   167             const XIDeviceEvent *xev = (const XIDeviceEvent *) cookie->data;
   168             SDL_SendTouchMotion(xev->sourceid,xev->detail,
   169                                 xev->event_x, xev->event_y, 1.0);
   170             return 1;
   171             }
   172             break;
   173 #endif
   174     }
   175 #endif
   176     return 0;
   177 }
   178 
   179 void
   180 X11_InitXinput2Multitouch(_THIS)
   181 {
   182 #if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH
   183     SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
   184     XIDeviceInfo *info;
   185     int ndevices,i,j;
   186     info = X11_XIQueryDevice(data->display, XIAllDevices, &ndevices);
   187 
   188     for (i = 0; i < ndevices; i++) {
   189         XIDeviceInfo *dev = &info[i];
   190         for (j = 0; j < dev->num_classes; j++) {
   191             SDL_TouchID touchId;
   192             XIAnyClassInfo *class = dev->classes[j];
   193             XITouchClassInfo *t = (XITouchClassInfo*)class;
   194 
   195             /* Only touch devices */
   196             if (class->type != XITouchClass)
   197                 continue;
   198 
   199             touchId = t->sourceid;
   200             SDL_AddTouch(touchId, dev->name);
   201         }
   202     }
   203     X11_XIFreeDeviceInfo(info);
   204 #endif
   205 }
   206 
   207 void
   208 X11_Xinput2SelectTouch(_THIS, SDL_Window *window)
   209 {
   210 #if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH
   211     SDL_VideoData *data = NULL;
   212     XIEventMask eventmask;
   213     unsigned char mask[3] = { 0,0,0 };
   214     SDL_WindowData *window_data = NULL;
   215     
   216     if (!X11_Xinput2IsMultitouchSupported()) {
   217         return;
   218     }
   219 
   220     data = (SDL_VideoData *) _this->driverdata;
   221     window_data = (SDL_WindowData*)window->driverdata;
   222 
   223     eventmask.deviceid = XIAllMasterDevices;
   224     eventmask.mask_len = sizeof(mask);
   225     eventmask.mask = mask;
   226 
   227     XISetMask(mask, XI_TouchBegin);
   228     XISetMask(mask, XI_TouchUpdate);
   229     XISetMask(mask, XI_TouchEnd);
   230 
   231     X11_XISelectEvents(data->display,window_data->xwindow,&eventmask,1);
   232 #endif
   233 }
   234 
   235 
   236 int
   237 X11_Xinput2IsInitialized()
   238 {
   239 #if SDL_VIDEO_DRIVER_X11_XINPUT2
   240     return xinput2_initialized;
   241 #else
   242     return 0;
   243 #endif
   244 }
   245 
   246 int
   247 X11_Xinput2IsMultitouchSupported()
   248 {
   249 #if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH
   250     return xinput2_initialized && xinput2_multitouch_supported;
   251 #else
   252     return 0;
   253 #endif
   254 }
   255 
   256 #endif /* SDL_VIDEO_DRIVER_X11 */
   257 
   258 /* vi: set ts=4 sw=4 expandtab: */