looking-glass/client/displayservers/SDL/sdl.c
Geoffrey McRae bad25c409c [client] displayserver: add new earlyInit to the interface
Some platforms such as Wayland need to set environment vairables before
SDL is initialized, as such this change detects the display server
before SDL has started and calls the new `earlyInit` method providing
the implementation an opportunity to set things up.
2021-01-16 20:41:13 +11:00

166 lines
3.8 KiB
C

/*
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 bool sdlEarlyInit(void)
{
return true;
}
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;
app_updateCursorPos(event->motion.x, event->motion.y);
if (app_cursorIsGrabbed())
app_handleMouseGrabbed(event->motion.xrel, event->motion.yrel);
else
app_handleMouseNormal(event->motion.xrel, event->motion.yrel);
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,
.earlyInit = sdlEarlyInit,
.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,
};