LookingGlass/client/displayservers/SDL/sdl.c

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/*
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 <SDL2/SDL_syswm.h>
#ifdef ENABLE_EGL
#include <EGL/eglext.h>
#endif
#if defined(SDL_VIDEO_DRIVER_WAYLAND)
#include <wayland-egl.h>
#endif
#include "app.h"
#include "kb.h"
#include "egl_dynprocs.h"
#include "common/types.h"
#include "common/debug.h"
#include "util.h"
struct SDLDSState
{
SDL_Window * window;
SDL_Cursor * cursor;
EGLNativeWindowType wlDisplay;
bool keyboardGrabbed;
bool pointerGrabbed;
bool exiting;
};
static struct SDLDSState sdl;
/* forwards */
static int sdlEventFilter(void * userdata, SDL_Event * event);
static void sdlSetup(void)
{
}
static bool sdlProbe(void)
{
return true;
}
static bool sdlEarlyInit(void)
{
return true;
}
static bool sdlInit(const LG_DSInitParams params)
{
memset(&sdl, 0, sizeof(sdl));
// Allow screensavers for now: we will enable and disable as needed.
SDL_SetHint(SDL_HINT_VIDEO_ALLOW_SCREENSAVER, "1");
if (SDL_Init(SDL_INIT_VIDEO) < 0)
{
DEBUG_ERROR("SDL_Init Failed");
return false;
}
#ifdef ENABLE_OPENGL
if (params.opengl)
{
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER , 1);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 4);
SDL_GL_SetAttribute(SDL_GL_RED_SIZE , 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE , 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE , 8);
}
#endif
sdl.window = SDL_CreateWindow(
params.title,
params.center ? SDL_WINDOWPOS_CENTERED : params.x,
params.center ? SDL_WINDOWPOS_CENTERED : params.y,
params.w,
params.h,
(
SDL_WINDOW_HIDDEN |
(params.resizable ? SDL_WINDOW_RESIZABLE : 0) |
(params.borderless ? SDL_WINDOW_BORDERLESS : 0) |
(params.maximize ? SDL_WINDOW_MAXIMIZED : 0) |
(params.opengl ? SDL_WINDOW_OPENGL : 0)
)
);
if (sdl.window == NULL)
{
DEBUG_ERROR("Could not create an SDL window: %s\n", SDL_GetError());
goto fail_init;
}
const uint8_t data[4] = {0xf, 0x9, 0x9, 0xf};
const uint8_t mask[4] = {0xf, 0xf, 0xf, 0xf};
sdl.cursor = SDL_CreateCursor(data, mask, 8, 4, 4, 0);
SDL_SetCursor(sdl.cursor);
SDL_ShowWindow(sdl.window);
SDL_SetHint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS, "0");
if (params.fullscreen)
SDL_SetWindowFullscreen(sdl.window, SDL_WINDOW_FULLSCREEN_DESKTOP);
if (!params.center)
SDL_SetWindowPosition(sdl.window, params.x, params.y);
// ensure mouse acceleration is identical in server mode
SDL_SetHintWithPriority(SDL_HINT_MOUSE_RELATIVE_MODE_WARP, "1", SDL_HINT_OVERRIDE);
SDL_SetEventFilter(sdlEventFilter, NULL);
return true;
fail_init:
SDL_Quit();
return false;
}
static void sdlStartup(void)
{
}
static void sdlShutdown(void)
{
}
static void sdlFree(void)
{
SDL_DestroyWindow(sdl.window);
if (sdl.cursor)
SDL_FreeCursor(sdl.cursor);
if (sdl.window)
SDL_DestroyWindow(sdl.window);
SDL_Quit();
}
static bool sdlGetProp(LG_DSProperty prop, void * ret)
{
return false;
}
#ifdef ENABLE_EGL
static EGLDisplay sdlGetEGLDisplay(void)
{
SDL_SysWMinfo wminfo;
SDL_VERSION(&wminfo.version);
if (!SDL_GetWindowWMInfo(sdl.window, &wminfo))
{
DEBUG_ERROR("SDL_GetWindowWMInfo failed");
return EGL_NO_DISPLAY;
}
EGLNativeDisplayType native;
EGLenum platform;
switch(wminfo.subsystem)
{
case SDL_SYSWM_X11:
native = (EGLNativeDisplayType)wminfo.info.x11.display;
platform = EGL_PLATFORM_X11_KHR;
break;
#if defined(SDL_VIDEO_DRIVER_WAYLAND)
case SDL_SYSWM_WAYLAND:
native = (EGLNativeDisplayType)wminfo.info.wl.display;
platform = EGL_PLATFORM_WAYLAND_KHR;
break;
#endif
default:
DEBUG_ERROR("Unsupported subsystem");
return EGL_NO_DISPLAY;
}
const char *early_exts = eglQueryString(NULL, EGL_EXTENSIONS);
if (util_hasGLExt(early_exts, "EGL_KHR_platform_base") &&
g_egl_dynProcs.eglGetPlatformDisplay)
{
DEBUG_INFO("Using eglGetPlatformDisplay");
return g_egl_dynProcs.eglGetPlatformDisplay(platform, native, NULL);
}
if (util_hasGLExt(early_exts, "EGL_EXT_platform_base") &&
g_egl_dynProcs.eglGetPlatformDisplayEXT)
{
DEBUG_INFO("Using eglGetPlatformDisplayEXT");
return g_egl_dynProcs.eglGetPlatformDisplayEXT(platform, native, NULL);
}
DEBUG_INFO("Using eglGetDisplay");
return eglGetDisplay(native);
}
static EGLNativeWindowType sdlGetEGLNativeWindow(void)
{
SDL_SysWMinfo wminfo;
SDL_VERSION(&wminfo.version);
if (!SDL_GetWindowWMInfo(sdl.window, &wminfo))
{
DEBUG_ERROR("SDL_GetWindowWMInfo failed");
return 0;
}
switch(wminfo.subsystem)
{
case SDL_SYSWM_X11:
return (EGLNativeWindowType)wminfo.info.x11.window;
#if defined(SDL_VIDEO_DRIVER_WAYLAND)
case SDL_SYSWM_WAYLAND:
{
if (sdl.wlDisplay)
return sdl.wlDisplay;
int width, height;
SDL_GetWindowSize(sdl.window, &width, &height);
sdl.wlDisplay = (EGLNativeWindowType)wl_egl_window_create(
wminfo.info.wl.surface, width, height);
return sdl.wlDisplay;
}
#endif
default:
DEBUG_ERROR("Unsupported subsystem");
return 0;
}
}
static void sdlEGLSwapBuffers(EGLDisplay display, EGLSurface surface, const struct Rect * damage, int count)
{
eglSwapBuffers(display, surface);
}
#endif //ENABLE_EGL
#ifdef ENABLE_OPENGL
static LG_DSGLContext sdlGLCreateContext(void)
{
return (LG_DSGLContext)SDL_GL_CreateContext(sdl.window);
}
static void sdlGLDeleteContext(LG_DSGLContext context)
{
SDL_GL_DeleteContext((SDL_GLContext)context);
}
static void sdlGLMakeCurrent(LG_DSGLContext context)
{
SDL_GL_MakeCurrent(sdl.window, (SDL_GLContext)context);
}
static void sdlGLSetSwapInterval(int interval)
{
SDL_GL_SetSwapInterval(interval);
}
static void sdlGLSwapBuffers(void)
{
SDL_GL_SwapWindow(sdl.window);
}
#endif //ENABLE_OPENGL
static int sdlEventFilter(void * userdata, SDL_Event * event)
{
switch(event->type)
{
case SDL_QUIT:
app_handleCloseEvent();
break;
case SDL_MOUSEMOTION:
// stop motion events during the warp out of the window
if (sdl.exiting)
break;
app_updateCursorPos(event->motion.x, event->motion.y);
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app_handleMouseRelative(event->motion.xrel, event->motion.yrel,
event->motion.xrel, event->motion.yrel);
break;
case SDL_MOUSEBUTTONDOWN:
{
int button = event->button.button;
if (button > 3)
button += 2;
app_handleButtonPress(button);
break;
}
case SDL_MOUSEBUTTONUP:
{
int button = event->button.button;
if (button > 3)
button += 2;
app_handleButtonRelease(button);
break;
}
case SDL_MOUSEWHEEL:
{
int button = event->wheel.y > 0 ? 4 : 5;
app_handleButtonPress(button);
app_handleButtonRelease(button);
break;
}
case SDL_KEYDOWN:
{
SDL_Scancode sc = event->key.keysym.scancode;
app_handleKeyPress(sdl_to_xfree86[sc]);
break;
}
case SDL_KEYUP:
{
SDL_Scancode sc = event->key.keysym.scancode;
app_handleKeyRelease(sdl_to_xfree86[sc]);
break;
}
case SDL_WINDOWEVENT:
switch(event->window.event)
{
case SDL_WINDOWEVENT_ENTER:
app_handleEnterEvent(true);
break;
case SDL_WINDOWEVENT_LEAVE:
sdl.exiting = false;
app_handleEnterEvent(false);
break;
case SDL_WINDOWEVENT_FOCUS_GAINED:
app_handleFocusEvent(true);
break;
case SDL_WINDOWEVENT_FOCUS_LOST:
app_handleFocusEvent(false);
break;
case SDL_WINDOWEVENT_SIZE_CHANGED:
case SDL_WINDOWEVENT_RESIZED:
{
struct Border border;
SDL_GetWindowBordersSize(
sdl.window,
&border.top,
&border.left,
&border.bottom,
&border.right
);
app_handleResizeEvent(
event->window.data1,
event->window.data2,
1,
border);
break;
}
case SDL_WINDOWEVENT_MOVED:
app_updateWindowPos(event->window.data1, event->window.data2);
break;
case SDL_WINDOWEVENT_CLOSE:
app_handleCloseEvent();
break;
}
break;
}
return 0;
}
static void sdlShowPointer(bool show)
{
SDL_ShowCursor(show ? SDL_ENABLE : SDL_DISABLE);
}
static void sdlGrabPointer(void)
{
SDL_SetWindowGrab(sdl.window, SDL_TRUE);
SDL_SetRelativeMouseMode(SDL_TRUE);
sdl.pointerGrabbed = true;
}
static void sdlUngrabPointer(void)
{
SDL_SetWindowGrab(sdl.window, SDL_FALSE);
SDL_SetRelativeMouseMode(SDL_FALSE);
sdl.pointerGrabbed = false;
}
static void sdlGrabKeyboard(void)
{
if (sdl.pointerGrabbed)
SDL_SetWindowGrab(sdl.window, 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(sdl.window, SDL_TRUE);
sdl.keyboardGrabbed = true;
}
static void sdlUngrabKeyboard(void)
{
SDL_SetHint(SDL_HINT_GRAB_KEYBOARD, "0");
SDL_SetWindowGrab(sdl.window, SDL_FALSE);
if (sdl.pointerGrabbed)
SDL_SetWindowGrab(sdl.window, SDL_TRUE);
sdl.keyboardGrabbed = false;
}
static void sdlWarpPointer(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(sdl.window, x, y);
}
static void sdlRealignPointer(void)
{
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app_handleMouseRelative(0.0, 0.0, 0.0, 0.0);
}
static bool sdlIsValidPointerPos(int x, int y)
{
const int displays = SDL_GetNumVideoDisplays();
for(int i = 0; i < displays; ++i)
{
SDL_Rect r;
SDL_GetDisplayBounds(i, &r);
if ((x >= r.x && x < r.x + r.w) &&
(y >= r.y && y < r.y + r.h))
return true;
}
return false;
}
static void sdlInhibitIdle(void)
{
SDL_DisableScreenSaver();
}
static void sdlUninhibitIdle(void)
{
SDL_EnableScreenSaver();
}
static void sdlWait(unsigned int time)
{
SDL_WaitEventTimeout(NULL, time);
}
static void sdlSetWindowSize(int x, int y)
{
SDL_SetWindowSize(sdl.window, x, y);
}
static void sdlSetFullscreen(bool fs)
{
SDL_SetWindowFullscreen(sdl.window, fs ? SDL_WINDOW_FULLSCREEN_DESKTOP : 0);
}
static bool sdlGetFullscreen(void)
{
return (SDL_GetWindowFlags(sdl.window) & SDL_WINDOW_FULLSCREEN_DESKTOP) != 0;
}
static void sdlMinimize(void)
{
SDL_MinimizeWindow(sdl.window);
}
struct LG_DisplayServerOps LGDS_SDL =
{
.setup = sdlSetup,
.probe = sdlProbe,
.earlyInit = sdlEarlyInit,
.init = sdlInit,
.startup = sdlStartup,
.shutdown = sdlShutdown,
.free = sdlFree,
.getProp = sdlGetProp,
#ifdef ENABLE_EGL
.getEGLDisplay = sdlGetEGLDisplay,
.getEGLNativeWindow = sdlGetEGLNativeWindow,
.eglSwapBuffers = sdlEGLSwapBuffers,
#endif
#ifdef ENABLE_OPENGL
.glCreateContext = sdlGLCreateContext,
.glDeleteContext = sdlGLDeleteContext,
.glMakeCurrent = sdlGLMakeCurrent,
.glSetSwapInterval = sdlGLSetSwapInterval,
.glSwapBuffers = sdlGLSwapBuffers,
#endif
.showPointer = sdlShowPointer,
.grabPointer = sdlGrabPointer,
.ungrabPointer = sdlUngrabPointer,
.capturePointer = sdlGrabPointer,
.uncapturePointer = sdlUngrabPointer,
.grabKeyboard = sdlGrabKeyboard,
.ungrabKeyboard = sdlUngrabKeyboard,
.warpPointer = sdlWarpPointer,
.realignPointer = sdlRealignPointer,
.isValidPointerPos = sdlIsValidPointerPos,
.inhibitIdle = sdlInhibitIdle,
.uninhibitIdle = sdlUninhibitIdle,
.wait = sdlWait,
.setWindowSize = sdlSetWindowSize,
.setFullscreen = sdlSetFullscreen,
.getFullscreen = sdlGetFullscreen,
.minimize = sdlMinimize,
/* SDL does not have clipboard support */
.cbInit = NULL,
};