[X11] Reconcile logical keyboard state with physical state on FocusIn

since the window system doesn't do it for us like other platforms.

This prevents sticky keys and missed keys when going in and out
of focus, for example Alt would appear to stick if switching away
from an SDL app with Alt-Tab and had to be pressed again.

CR: Sam

src/loadso/dlopen/SDL_sysloadso.c

@@ -0,0 +1,74 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifdef SDL_LOADSO_DLOPEN
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/* System dependent library loading routines                           */
+
+#include <stdio.h>
+#include <dlfcn.h>
+
+#include "SDL_loadso.h"
+
+void *
+SDL_LoadObject(const char *sofile)
+{
+    void *handle = dlopen(sofile, RTLD_NOW|RTLD_LOCAL);
+    const char *loaderror = (char *) dlerror();
+    if (handle == NULL) {
+        SDL_SetError("Failed loading %s: %s", sofile, loaderror);
+    }
+    return (handle);
+}
+
+void *
+SDL_LoadFunction(void *handle, const char *name)
+{
+    void *symbol = dlsym(handle, name);
+    if (symbol == NULL) {
+        /* append an underscore for platforms that need that. */
+        size_t len = 1 + SDL_strlen(name) + 1;
+        char *_name = SDL_stack_alloc(char, len);
+        _name[0] = '_';
+        SDL_strlcpy(&_name[1], name, len);
+        symbol = dlsym(handle, _name);
+        SDL_stack_free(_name);
+        if (symbol == NULL) {
+            SDL_SetError("Failed loading %s: %s", name,
+                         (const char *) dlerror());
+        }
+    }
+    return (symbol);
+}
+
+void
+SDL_UnloadObject(void *handle)
+{
+    if (handle != NULL) {
+        dlclose(handle);
+    }
+}
+
+#endif /* SDL_LOADSO_DLOPEN */
+
+/* vi: set ts=4 sw=4 expandtab: */

src/loadso/dummy/SDL_sysloadso.c

@@ -0,0 +1,54 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#if defined(SDL_LOADSO_DUMMY) || defined(SDL_LOADSO_DISABLED)
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/* System dependent library loading routines                           */
+
+#include "SDL_loadso.h"
+
+void *
+SDL_LoadObject(const char *sofile)
+{
+    const char *loaderror = "SDL_LoadObject() not implemented";
+    SDL_SetError("Failed loading %s: %s", sofile, loaderror);
+    return (NULL);
+}
+
+void *
+SDL_LoadFunction(void *handle, const char *name)
+{
+    const char *loaderror = "SDL_LoadFunction() not implemented";
+    SDL_SetError("Failed loading %s: %s", name, loaderror);
+    return (NULL);
+}
+
+void
+SDL_UnloadObject(void *handle)
+{
+    /* no-op. */
+}
+
+#endif /* SDL_LOADSO_DUMMY || SDL_LOADSO_DISABLED */
+
+/* vi: set ts=4 sw=4 expandtab: */

src/loadso/haiku/SDL_sysloadso.c

@@ -0,0 +1,71 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifdef SDL_LOADSO_HAIKU
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/* System dependent library loading routines                           */
+
+#include <stdio.h>
+#include <os/kernel/image.h>
+
+#include "SDL_loadso.h"
+
+void *
+SDL_LoadObject(const char *sofile)
+{
+    void *handle = NULL;
+    image_id library_id = load_add_on(sofile);
+    if (library_id < 0) {
+        SDL_SetError(strerror((int) library_id));
+    } else {
+        handle = (void *) (library_id);
+    }
+    return (handle);
+}
+
+void *
+SDL_LoadFunction(void *handle, const char *name)
+{
+    void *sym = NULL;
+    image_id library_id = (image_id) handle;
+    status_t rc =
+        get_image_symbol(library_id, name, B_SYMBOL_TYPE_TEXT, &sym);
+    if (rc != B_NO_ERROR) {
+        SDL_SetError(strerror(rc));
+    }
+    return (sym);
+}
+
+void
+SDL_UnloadObject(void *handle)
+{
+    image_id library_id;
+    if (handle != NULL) {
+        library_id = (image_id) handle;
+        unload_add_on(library_id);
+    }
+}
+
+#endif /* SDL_LOADSO_HAIKU */
+
+/* vi: set ts=4 sw=4 expandtab: */

src/loadso/windows/SDL_sysloadso.c

@@ -0,0 +1,80 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifdef SDL_LOADSO_WINDOWS
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/* System dependent library loading routines                           */
+
+#include "../../core/windows/SDL_windows.h"
+
+#include "SDL_loadso.h"
+
+void *
+SDL_LoadObject(const char *sofile)
+{
+    LPTSTR tstr = WIN_UTF8ToString(sofile);
+#ifdef __WINRT__
+    /* WinRT only publically supports LoadPackagedLibrary() for loading .dll
+       files.  LoadLibrary() is a private API, and not available for apps
+       (that can be published to MS' Windows Store.)
+    */
+    void *handle = (void *) LoadPackagedLibrary(tstr, 0);
+#else
+    void *handle = (void *) LoadLibrary(tstr);
+#endif
+    SDL_free(tstr);
+
+    /* Generate an error message if all loads failed */
+    if (handle == NULL) {
+        char errbuf[512];
+        SDL_strlcpy(errbuf, "Failed loading ", SDL_arraysize(errbuf));
+        SDL_strlcat(errbuf, sofile, SDL_arraysize(errbuf));
+        WIN_SetError(errbuf);
+    }
+    return handle;
+}
+
+void *
+SDL_LoadFunction(void *handle, const char *name)
+{
+    void *symbol = (void *) GetProcAddress((HMODULE) handle, name);
+    if (symbol == NULL) {
+        char errbuf[512];
+        SDL_strlcpy(errbuf, "Failed loading ", SDL_arraysize(errbuf));
+        SDL_strlcat(errbuf, name, SDL_arraysize(errbuf));
+        WIN_SetError(errbuf);
+    }
+    return symbol;
+}
+
+void
+SDL_UnloadObject(void *handle)
+{
+    if (handle != NULL) {
+        FreeLibrary((HMODULE) handle);
+    }
+}
+
+#endif /* SDL_LOADSO_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */