[client] major restructure of platform specific code

client/displayservers/SDL/CMakeLists.txt

@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.0)
+project(displayserver_SDL LANGUAGES C)
+
+#find_package(PkgConfig)
+#pkg_check_modules(DISPLAYSERVER_SDL_PKGCONFIG REQUIRED
+#	#sdl2
+#)
+
+add_library(displayserver_SDL STATIC
+	sdl.c
+)
+
+target_link_libraries(displayserver_SDL
+	${DISPLAYSERVER_SDL_PKGCONFIG_LIBRARIES}
+	${DISPLAYSERVER_SDL_OPT_PKGCONFIG_LIBRARIES}
+	lg_common
+)
+
+target_include_directories(displayserver_SDL
+	PRIVATE
+		src
+		${DISPLAYSERVER_SDL_PKGCONFIG_INCLUDE_DIRS}
+		${DISPLAYSERVER_SDL_OPT_PKGCONFIG_INCLUDE_DIRS}
+)

client/displayservers/SDL/sdl.c

@@ -0,0 +1,154 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2017-2021 Geoffrey McRae <geoff@hostfission.com>
+https://looking-glass.hostfission.com
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "interface/displayserver.h"
+
+#include <SDL2/SDL.h>
+
+#include "app.h"
+#include "common/debug.h"
+
+struct SDLDSState
+{
+  bool keyboardGrabbed;
+  bool pointerGrabbed;
+  bool exiting;
+};
+
+static struct SDLDSState sdl;
+
+static void sdlInit(SDL_SysWMinfo * info)
+{
+  memset(&sdl, 0, sizeof(sdl));
+}
+
+static void sdlStartup(void)
+{
+}
+
+static void sdlShutdown(void)
+{
+}
+
+static void sdlFree(void)
+{
+}
+
+static bool sdlGetProp(LG_DSProperty prop, void * ret)
+{
+  return false;
+}
+
+static bool sdlEventFilter(SDL_Event * event)
+{
+  switch(event->type)
+  {
+    case SDL_MOUSEMOTION:
+      // stop motion events during the warp out of the window
+      if (sdl.exiting)
+        return true;
+      break;
+
+    case SDL_WINDOWEVENT:
+    {
+      switch(event->window.event)
+      {
+        /* after leave re-enable warp and cursor processing */
+        case SDL_WINDOWEVENT_LEAVE:
+          sdl.exiting = false;
+          return false;
+      }
+      break;
+    }
+  }
+
+  return false;
+}
+
+static void sdlGrabPointer(void)
+{
+  SDL_SetWindowGrab(app_getWindow(), SDL_TRUE);
+  SDL_SetRelativeMouseMode(SDL_TRUE);
+  sdl.pointerGrabbed = true;
+}
+
+static void sdlUngrabPointer(void)
+{
+  SDL_SetWindowGrab(app_getWindow(), SDL_FALSE);
+  SDL_SetRelativeMouseMode(SDL_FALSE);
+  sdl.pointerGrabbed = false;
+}
+
+static void sdlGrabKeyboard(void)
+{
+  if (sdl.pointerGrabbed)
+    SDL_SetWindowGrab(app_getWindow(), SDL_FALSE);
+  else
+  {
+    DEBUG_WARN("SDL does not support grabbing only the keyboard, grabbing all");
+    sdl.pointerGrabbed = true;
+  }
+
+  SDL_SetHint(SDL_HINT_GRAB_KEYBOARD, "1");
+  SDL_SetWindowGrab(app_getWindow(), SDL_TRUE);
+  sdl.keyboardGrabbed = true;
+}
+
+static void sdlUngrabKeyboard(void)
+{
+  SDL_SetHint(SDL_HINT_GRAB_KEYBOARD, "0");
+  SDL_SetWindowGrab(app_getWindow(), SDL_FALSE);
+  if (sdl.pointerGrabbed)
+    SDL_SetWindowGrab(app_getWindow(), SDL_TRUE);
+  sdl.keyboardGrabbed = false;
+}
+
+static void sdlWarpMouse(int x, int y, bool exiting)
+{
+  if (sdl.exiting)
+    return;
+
+  sdl.exiting = exiting;
+
+  // if exiting turn off relative mode
+  if (exiting)
+    SDL_SetRelativeMouseMode(SDL_FALSE);
+
+  // issue the warp
+  SDL_WarpMouseInWindow(app_getWindow(), x, y);
+}
+
+struct LG_DisplayServerOps LGDS_SDL =
+{
+  .subsystem      = SDL_SYSWM_UNKNOWN,
+  .init           = sdlInit,
+  .startup        = sdlStartup,
+  .shutdown       = sdlShutdown,
+  .free           = sdlFree,
+  .getProp        = sdlGetProp,
+  .eventFilter    = sdlEventFilter,
+  .grabPointer    = sdlGrabPointer,
+  .ungrabPointer  = sdlUngrabPointer,
+  .grabKeyboard   = sdlGrabKeyboard,
+  .ungrabKeyboard = sdlUngrabKeyboard,
+  .warpMouse      = sdlWarpMouse,
+
+  /* SDL does not have clipboard support */
+  .cbInit    = NULL,
+};