src/video/wayland/SDL_waylandtouch.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 04 Jun 2020 12:30:25 -0700
changeset 13898 aa9d7c43a982
parent 13696 ea20a7434b98
permissions -rw-r--r--
Fixed exception if getManifestEnvironmentVariables() is called without a current SDL activity
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2020 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 
    22 /* Contributed by Thomas Perl <thomas.perl@jollamobile.com> */
    23 
    24 #include "../../SDL_internal.h"
    25 
    26 #ifdef SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH
    27 
    28 #include "SDL_mouse.h"
    29 #include "SDL_keyboard.h"
    30 #include "SDL_waylandtouch.h"
    31 #include "../../events/SDL_touch_c.h"
    32 
    33 struct SDL_WaylandTouch {
    34     struct qt_touch_extension *touch_extension;
    35 };
    36 
    37 
    38 /**
    39  * Qt TouchPointState
    40  * adapted from qtbase/src/corelib/global/qnamespace.h
    41  **/
    42 enum QtWaylandTouchPointState {
    43     QtWaylandTouchPointPressed    = 0x01,
    44     QtWaylandTouchPointMoved      = 0x02,
    45     /*
    46     Never sent by the server:
    47     QtWaylandTouchPointStationary = 0x04,
    48     */
    49     QtWaylandTouchPointReleased   = 0x08,
    50 };
    51 
    52 static void
    53 touch_handle_touch(void *data,
    54         struct qt_touch_extension *qt_touch_extension,
    55         uint32_t time,
    56         uint32_t id,
    57         uint32_t state,
    58         int32_t x,
    59         int32_t y,
    60         int32_t normalized_x,
    61         int32_t normalized_y,
    62         int32_t width,
    63         int32_t height,
    64         uint32_t pressure,
    65         int32_t velocity_x,
    66         int32_t velocity_y,
    67         uint32_t flags,
    68         struct wl_array *rawdata)
    69 {
    70     /**
    71      * Event is assembled in QtWayland in TouchExtensionGlobal::postTouchEvent
    72      * (src/compositor/wayland_wrapper/qwltouch.cpp)
    73      **/
    74 
    75     float FIXED_TO_FLOAT = 1. / 10000.;
    76     float xf = FIXED_TO_FLOAT * x;
    77     float yf = FIXED_TO_FLOAT * y;
    78 
    79     float PRESSURE_TO_FLOAT = 1. / 255.;
    80     float pressuref = PRESSURE_TO_FLOAT * pressure;
    81 
    82     uint32_t touchState = state & 0xFFFF;
    83     /*
    84     Other fields that are sent by the server (qwltouch.cpp),
    85     but not used at the moment can be decoded in this way:
    86 
    87     uint32_t sentPointCount = state >> 16;
    88     uint32_t touchFlags = flags & 0xFFFF;
    89     uint32_t capabilities = flags >> 16;
    90     */
    91 
    92     SDL_Window* window = NULL;
    93 
    94     SDL_TouchID deviceId = 1;
    95     if (SDL_AddTouch(deviceId, SDL_TOUCH_DEVICE_DIRECT, "qt_touch_extension") < 0) {
    96          SDL_Log("error: can't add touch %s, %d", __FILE__, __LINE__);
    97     }
    98 
    99     /* FIXME: This should be the window the given wayland surface is associated
   100      * with, but how do we get the wayland surface? */
   101     window = SDL_GetMouseFocus();
   102     if (window == NULL) {
   103         window = SDL_GetKeyboardFocus();
   104     }
   105 
   106     switch (touchState) {
   107         case QtWaylandTouchPointPressed:
   108         case QtWaylandTouchPointReleased:
   109             SDL_SendTouch(deviceId, (SDL_FingerID)id, window,
   110                     (touchState == QtWaylandTouchPointPressed) ? SDL_TRUE : SDL_FALSE,
   111                     xf, yf, pressuref);
   112             break;
   113         case QtWaylandTouchPointMoved:
   114             SDL_SendTouchMotion(deviceId, (SDL_FingerID)id, window, xf, yf, pressuref);
   115             break;
   116         default:
   117             /* Should not happen */
   118             break;
   119     }
   120 }
   121 
   122 static void
   123 touch_handle_configure(void *data,
   124         struct qt_touch_extension *qt_touch_extension,
   125         uint32_t flags)
   126 {
   127 }
   128 
   129 
   130 /* wayland-qt-touch-extension.c BEGINS */
   131 
   132 static const struct qt_touch_extension_listener touch_listener = {
   133     touch_handle_touch,
   134     touch_handle_configure,
   135 };
   136 
   137 static const struct wl_interface *qt_touch_extension_types[] = {
   138     NULL,
   139     NULL,
   140     NULL,
   141     NULL,
   142     NULL,
   143     NULL,
   144     NULL,
   145     NULL,
   146     NULL,
   147     NULL,
   148     NULL,
   149     NULL,
   150     NULL,
   151     NULL,
   152 };
   153 
   154 static const struct wl_message qt_touch_extension_requests[] = {
   155     { "dummy", "", qt_touch_extension_types + 0 },
   156 };
   157 
   158 static const struct wl_message qt_touch_extension_events[] = {
   159     { "touch", "uuuiiiiiiuiiua", qt_touch_extension_types + 0 },
   160     { "configure", "u", qt_touch_extension_types + 0 },
   161 };
   162 
   163 WL_EXPORT const struct wl_interface qt_touch_extension_interface = {
   164     "qt_touch_extension", 1,
   165     1, qt_touch_extension_requests,
   166     2, qt_touch_extension_events,
   167 };
   168 
   169 /* wayland-qt-touch-extension.c ENDS */
   170 
   171 /* wayland-qt-windowmanager.c BEGINS */
   172 static const struct wl_interface *qt_windowmanager_types[] = {
   173     NULL,
   174     NULL,
   175 };
   176 
   177 static const struct wl_message qt_windowmanager_requests[] = {
   178     { "open_url", "us", qt_windowmanager_types + 0 },
   179 };
   180 
   181 static const struct wl_message qt_windowmanager_events[] = {
   182     { "hints", "i", qt_windowmanager_types + 0 },
   183     { "quit", "", qt_windowmanager_types + 0 },
   184 };
   185 
   186 WL_EXPORT const struct wl_interface qt_windowmanager_interface = {
   187     "qt_windowmanager", 1,
   188     1, qt_windowmanager_requests,
   189     2, qt_windowmanager_events,
   190 };
   191 /* wayland-qt-windowmanager.c ENDS */
   192 
   193 /* wayland-qt-surface-extension.c BEGINS */
   194 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
   195 extern const struct wl_interface wl_surface_interface;
   196 #endif
   197 
   198 static const struct wl_interface *qt_surface_extension_types[] = {
   199     NULL,
   200     NULL,
   201     &qt_extended_surface_interface,
   202 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
   203     /* FIXME: Set this dynamically to (*WAYLAND_wl_surface_interface) ? 
   204      * The value comes from auto generated code and does 
   205      * not appear to actually be used anywhere
   206      */
   207     NULL, 
   208 #else
   209     &wl_surface_interface,
   210 #endif    
   211 };
   212 
   213 static const struct wl_message qt_surface_extension_requests[] = {
   214     { "get_extended_surface", "no", qt_surface_extension_types + 2 },
   215 };
   216 
   217 WL_EXPORT const struct wl_interface qt_surface_extension_interface = {
   218     "qt_surface_extension", 1,
   219     1, qt_surface_extension_requests,
   220     0, NULL,
   221 };
   222 
   223 static const struct wl_message qt_extended_surface_requests[] = {
   224     { "update_generic_property", "sa", qt_surface_extension_types + 0 },
   225     { "set_content_orientation", "i", qt_surface_extension_types + 0 },
   226     { "set_window_flags", "i", qt_surface_extension_types + 0 },
   227 };
   228 
   229 static const struct wl_message qt_extended_surface_events[] = {
   230     { "onscreen_visibility", "i", qt_surface_extension_types + 0 },
   231     { "set_generic_property", "sa", qt_surface_extension_types + 0 },
   232     { "close", "", qt_surface_extension_types + 0 },
   233 };
   234 
   235 WL_EXPORT const struct wl_interface qt_extended_surface_interface = {
   236     "qt_extended_surface", 1,
   237     3, qt_extended_surface_requests,
   238     3, qt_extended_surface_events,
   239 };
   240 
   241 /* wayland-qt-surface-extension.c ENDS */
   242 
   243 void
   244 Wayland_touch_create(SDL_VideoData *data, uint32_t id)
   245 {
   246     struct SDL_WaylandTouch *touch;
   247 
   248     if (data->touch) {
   249         Wayland_touch_destroy(data);
   250     }
   251 
   252     /* !!! FIXME: check for failure, call SDL_OutOfMemory() */
   253     data->touch = SDL_malloc(sizeof(struct SDL_WaylandTouch));
   254 
   255     touch = data->touch;
   256     touch->touch_extension = wl_registry_bind(data->registry, id, &qt_touch_extension_interface, 1);
   257     qt_touch_extension_add_listener(touch->touch_extension, &touch_listener, data);
   258 }
   259 
   260 void
   261 Wayland_touch_destroy(SDL_VideoData *data)
   262 {
   263     if (data->touch) {
   264         struct SDL_WaylandTouch *touch = data->touch;
   265         if (touch->touch_extension) {
   266             qt_touch_extension_destroy(touch->touch_extension);
   267         }
   268 
   269         SDL_free(data->touch);
   270         data->touch = NULL;
   271     }
   272 }
   273 
   274 #endif /* SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH */